Source: http://www.docstoc.com/docs/46479285/Hamworthy-Heating-Milton-Boiler-Sequence-Control
Timestamp: 2014-07-22 20:09:40
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Matched Legal Cases: ['arts                                          01202', 'art,            16', 'art 1', 'art 2', 'art 3', 'art 4', 'art 1', 'art 2', 'arts                              01202']

Hamworthy Heating Milton Boiler Sequence Control
Boiler Sequence Control System
for Fully Modulating, High/Low &amp; On/Off
Boilers with Optimum Start and Outside
THESE INSTRUCTIONS MUST BE READ
AND UNDERSTOOD BEFORE INSTALLING,
COMMISSIONING, OPERATING OR
Technical Enquiries                                 01202 662527 / 662528
To supplement the detailed technical brochures, technical advice on the appli-
cation and use of products in the Hamworthy Heating range is available from
our technical team in Poole and our accredited agents.
Site Assembly                                        01202 662555
Hamworthy offer a service of site assembly for many of our products in
instances where plant room area is restricted. Using our trained staff we offer
a higher quality of build and assurance of a boiler built and tested by the
Commissioning                                       01202 662555
Commissioning of equipment by our engineers, accredited agents or specialist
sub-contractors will ensure the equipment is operating safely and efficiently.
Maintenance Agreements                              01202 662555
Regular routine servicing of equipment by Hamworthy service engineers
inspects the safety and integrity of the plant, reducing rhe risk of failure and
improving performance and efficiency. Maintenance agreements enable our
customers to plan and budget more efficiently.
Breakdown service, repair, replacement              01202 662555
Hamworthy provide a rapid response breakdown, repair or replacement
service through head office at Poole and accredited agents throughout the UK.
Spare Parts                                          01202 662525
A comprehensive spare parts service is operated from our factory in Poole,
providing replacement parts for both current and discontinued products.
Delivery of parts and components is normally from stock within seven days.
However, a next day delivery service is available for breakdowns and
FOR FULLY MODULATING BOILERS
WITH OPTIMUM START AND OUTSIDE
NOTE: THESE INSTRUCTIONS SHOULD BE READ AND UNDERSTOOD
BEFORE ATTEMPTING TO INSTALL, COMMISSION OR OPERATE THE
MILTON BOILER SEQUENCE CONTROL SYSTEM.
THE MILTON BOILER SEQUENCE CONTROL SYSTEM IS INTENDED FOR
USE ONLY IN COMMERCIAL / LIGHT INDUSTRIAL APPLICATIONS.
THIS BOILER SEQUENCE CONTROL SYSTEM COMPLIES WITH ALL
RELEVANT EUROPEAN DIRECTIVES
PUBLICATION NO. 500001104
ISSUE ‘C’
SOFTWARE VERSION V2.3 ONWARDS
HAMWORTHY HEATING LTD     MILTON                 500001104/C
1.0      INTRODUCTION ...................................................................................... 1
2.0      TECHNICAL DATA .................................................................................. 3
2.1      Overall Dimensions ................................................................................... 3
2.2      Technical Data Table ................................................................................ 3
3.0      DESCRIPTION OF OPERATION ............................................................. 5
3.1      Communication ......................................................................................... 5
3.2      Basic Operation ........................................................................................ 5
3.3      Remote Modulation Control Operation ..................................................... 8
3.4      Outside Air Temperature Compensation Function Operation ................... 8
3.5      Summer Shutdown Function Operation .................................................... 8
3.6      Optimum Start Function Operation ........................................................... 8
3.7      Daytime Optimisation Function Operation .............................................. 10
3.8      Night Set-Back Function Operation ........................................................ 10
3.9      Frost Protection Function Operation ....................................................... 10
3.10     Safety Interlock Circuit Operation ........................................................... 10
3.11     Override Function Operation................................................................... 11
3.12     Data Logging Operation .......................................................................... 11
4.0      INSTALLATION ..................................................................................... 11
4.1      Control Location...................................................................................... 11
4.2      Electrical Connections ............................................................................ 11
4.3      Boiler Control Connections ..................................................................... 13
4.4      Control Input Connections ...................................................................... 13
4.5      Temperature Sensors ............................................................................. 14
4.6      Completion.............................................................................................. 20
5.0      COMMISSIONING .................................................................................. 20
5.1      Pre-commissioning Checks .................................................................... 20
5.2      Programming .......................................................................................... 20
5.2.1    Program Menu Overview ........................................................................ 20
5.2.2    Keypad Operation ................................................................................... 21
5.2.3    Programming Screen Timeout ................................................................ 21
5.2.4    Overview - Enter engineer’s settings menu and navigate submenus ..... 21
5.2.5    Overview - Modifying a setting value ...................................................... 22
5.2.6    Master Control Mode Submenu .............................................................. 23
5.2.7    Clock Submenu ...................................................................................... 24
5.2.8    Compensation Submenu ........................................................................ 24
5.2.9    Optimiser Submenu ................................................................................ 25
5.2.10   Sequencer Submenu .............................................................................. 26
5.2.11   Circulation Pump Submenu .................................................................... 29
5.2.12   Frost Protection Submenu ...................................................................... 30
5.2.13   Overrides Submenu ................................................................................ 30
5.2.14   Security Code Submenu ......................................................................... 31
5.3      Operation Checks ................................................................................... 31
6.0      FAULT FINDING .................................................................................... 32
7.0      SERVICING ............................................................................................ 32
HAMWORTHY HEATING LTD                              MILTON                                       500001104/C
2.1     Overall Dimensions ..............................................................................4
2.2     Technical Data .....................................................................................5
3.2.3.1 On/Off Cascade Sequence ..................................................................6
3.2.3.2 High/Low Cascade Sequence ..............................................................6
3.2.3.3 Low/Low Cascade Sequence...............................................................7
3.2.3.4 Modulating Cascade Sequence ...........................................................7
3.2.3.5 Modulating Unison Sequence ..............................................................7
3.4     Compensation Function Characteristic Graph .....................................9
4.1     Mounting Holes ..................................................................................11
4.2     Site Wiring Schematic ........................................................................12
4.5.2a  Insertion Type Water Flow Temperature Sensor ...............................15
4.5.2b  Clamp-on Type Water Flow Temperature Sensor..............................16
4.5.3   Outside Air Temperature Sensor .......................................................18
4.5.4a  Room Temperature Sensor................................................................19
4.5.4b  Multiple Room Temperature Sensor Wiring Configurations ...............17
5.3.5   Installation Settings .......................................................................38/39
6.0     Fault Finding .......................................................................33/34/35/36
HAMWORTHY HEATING LTD                           MILTON                                    500001104/C
HAMWORTHY HEATING LTD   MILTON        500001104/C
1.0 INTRODUCTION                           1.3 Control Features
1.1 This boiler sequence control           1.3.1 Time Clock - 7 day timer with 4
system must be installed by a              `Active&#39; (on) period settings per day.
competent person.                          An external time clock can be
connected to override the in-built
All installations must conform to the
relevant IEE and Building Regulations
as well as any local regulations which     1.3.2 Remote Override Facility - A
apply. HSE requirements must also be       remote switch can be connected to the
taken into account when installing any     sequence control, which when closed
equipment.                                 will cause it to override to ‘Active’ for
the duration that the switch is closed.
Failure to comply with the above may
lead to Prosecution.                       1.3.3 Sequencing Options –
1.2 The Milton boiler sequence             1) On/Off Cascade - This option is for
control system is microprocessor           sequencing of Hamworthy on/off
based and designed for use with the        boilers, and steps each boiler on at full
Hamworthy fully modulating, high/low       rate, to match the system load.
and on/off boiler ranges.
2) High/Low Cascade - This option is
An optional Hamworthy ‘Sequencing          for sequencing of Hamworthy high/low
Interface Module’ must be fitted to        boilers, and steps a boiler on at low
each high/low or on/off boiler to          fire, then steps the boiler to high fire,
enable control of the boiler by the        repeating for each boiler, to match the
Milton boiler sequence control.            system load. The sequence control
can also accommodate a combination
The sequence control is designed to
of on/off and high/low boilers, with the
be wall mounted in the boiler house or
on/off boilers always being last in the
alternatively, if required, anywhere
sequence. This option is
recommended for systems comprising
The sequence control provides control      a combination of condensing and non-
of up to 9 fully modulating, high/low or   condensing boilers, such that the
on/off boilers. The sequence control       condensing boilers are first in the
also provides control of the boiler        sequence and operate the most to
system primary circulation pump.           take advantage of their higher
The boilers are connected in series to
the sequence control via a serial data     3) Low/Low Cascade - This option is
connection. The water flow                 for sequencing of Hamworthy high/low
temperature sensor (available in           boilers, and steps each boiler on at
insertion and clamp-on versions) and       low fire, before stepping each boiler to
optional room temperature and              high fire, to match the system load.
outside air temperature sensors are of     The sequence control can also
the PT1000 type and are individually       accommodate a combination of on/off
wired to the sequence control. It is       and high/low boilers, with the on/off
possible to connect a number of room       boilers always being last in the
temperature sensors to provide an          sequence. This option is
average room temperature reading. All      recommended for systems comprising
connections to the sequence control        identical boilers, and takes best
must be made using standard conduit        advantage of the higher boiler
cabling, shielded cabling must not be      efficiency at low fire.
HAMWORTHY HEATING LTD                MILTON                          500001104/C
4) Modulating Cascade - This option is      Milton functions are disabled. A
for sequencing of Hamworthy fully           ‘Master’ setting is included in the
modulating boilers, and steps an            engineers setting menu to select this
individual boiler on at its lowest rate     option.
and then modulates it to its maximum
1.3.6 O u t s i d e T e m p e r a t u r e
rate, before switching on the next
Compensation - This function requires
boiler at its lowest rate, to match the
an optional outside air temperature
system load. This option is
sensor. The compensation function
adjusts the water flow temperature
a combination of condensing and non-
setting in relation to the outside air
condensing boilers, such that the
temperature. As the outside air
condensing boilers are first in the
temperature falls the heat loss from a
sequence and operate the most to
building increases, so to compensate
take advantage of their higher
for this the sequence control will
increase the water flow temperature,
5) Modulating Unison - This option is       thus increasing the heat input to the
for sequencing of Hamworthy fully           building and maintaining the desired
modulating boilers, and steps each          comfort level. If this function is not
boiler on to its lowest rate in turn        utilised, the sequence control will
before modulating all boilers               control to a fixed water flow
simultaneously to their maximum rate,       temperature.
to match the system load. This option
1.3.7 Summer Shutdown - This
is recommended for systems
function requires an optional outside
comprising identical boilers, and takes
air temperature sensor. The function
best advantage of the higher boiler
shuts down the boiler system when
efficiencies at low firing rates.
the measured outside air temperature
1.3.4 Weekly Shift Sequencing - The         reaches a programmable set point,
lead boiler is shifted every 7 days (at     preventing unnecessary operation of
midnight on Sunday), to ensure even         the heating system.
usage of the boilers. It is also possible
1.3.8 Optimum Start - This function
to select a number of fixed lead
requires both the optional outside air
boilers, whilst shifting the firing
temperature and room temperature
sequence of the remaining boilers.
sensors. The function adjusts the
This is useful in applications where a
heating start time in relation to the
combination of condensing and high
outside air and room temperatures.
efficiency boilers are installed, and it
The colder the outside air and room
would be desirable to have maximum
temperatures are, so the earlier the
use of the condensing boilers. This
heating is started. In this way the
function can be disabled to maintain a
heating is switched on as late as
fixed sequence.
possible to achieve the desired room
1.3.5 Remote Modulation Control -           comfort level at the required time (the
The sequence control incorporates the       time clock settings represent the time
facility to set the boiler system           at which the desired room comfort
modulation rate based on the level of       level is to be achieved). The optimum
a 0 to 10V analogue signal from an          start includes a self-learning function
external building management system         to tune the system to each installation.
(BMS) control. In this mode of              The self-learning function can be
operation the water flow temperature        disabled. The optimum start function
sensor is not required, and all other       can be disabled and the system will
HAMWORTHY HEATING LTD                 MILTON                          500001104/C
start at the times specified by the time    long periods      of   heating   system
clock settings.                             inactivity.
1.3.9 Daytime Optimisation – This           1.3.13 Holiday Override – This
function requires an optional room          function overrides the time clock
temperature sensor. When the room           during selected holiday periods,
temperature reaches the room                preventing the heating system from
temperature set point the boilers are       operating. Up to 5 holiday periods can
switched off immediately, and the           be programmed.
circulation pump is switched off after
1.3.14 Remote Holiday Override – A
its overrun time. Normal operation
remote switch can be connected to the
resumes if the room temperature
sequence control which when closed
subsequently falls below the set point.
will put the control into a holiday
1.3.10 Night Set-Back – This function       shutdown mode. Normal operation will
provides an additional room                 resume when the switch is opened.
temperature setting for time clock
1.3.15 Safety Interlock Circuit – This
Standby periods, thus preventing the
function allows the connection of
building fabric from falling below this
external system safety devices, such
temperature during these periods.
as flue exhaust fan proving switch,
1.3.11 Frost Protection - When the          pressurisation unit safety circuit, etc,
sequence control is in Standby (off/        to the sequence control. If the circuit is
night-setback) mode, this function fires    broken by any of the safety devices
the boilers to maintain a minimum flow      the boilers are prevented from firing.
water temperature, to prevent freezing      Note: The boilers must also be
of the heating system water.                individually interlocked to the safety
Additionally, if an outside air             devices.
temperature sensor is connected the
1.3.16 Data Logging – This function
circulation pump will be started at an
enables access to logged information
outside air temperature below an
stored on each boiler. Hours run,
adjustable set point, thus providing
number of starts and gas consumption
are recorded, and any fault conditions
1.3.12 Pump Control – A relay contact       such as lockout and overheat are
is provided to control the system           logged with the date and time of
primary circulation pump (see Figure        occurrence.
2.2 p5 for contact rating). A circulation   Note: This functionality is only
pump overrun timer function is              available on the Hamworthy Heating
included to make use of the residual        range of modulating boilers.
boiler heat when the boilers are
switched off at the end of an Active
period, or when the desired room            2.1 Overall dimensions, mounting
temperature is achieved (with daytime       hole positions and cable entry
optimisation function). A pump              positions for the sequence control are
maintenance function is also included       shown in Figure 2.1 (p4).
to operate the circulation pump briefly
2.2 Technical specification details
once a week, to prevent seizing during
are shown in Figure 2.2 (p5).
HAMWORTHY HEATING LTD                 MILTON                           500001104/C
Figure 2.1 - Overall Dimensions
HAMWORTHY HEATING LTD             MILTON   500001104/C
Figure 2.2 - Technical Data
Supply Voltage                                               230V ~ 50Hz
Power Consumption                                              3W max.
Circulation Pump Contact Rating                               250V ~ 2A
Dimensions (including wiring base)                      100W x 125H x 104D
Weight                                                          0.45kg
Data Memory and Time-clock Battery Backup                   10 years max.
Maximum Boiler Communication Cable Run                            50m
Sensor Type                                                     PT1000
Maximum Cable Run                                                500m
3.0 DESCRIPTION OF OPERATION                sequencing interface module fascia)
will flash on to indicate that this has
On application of the electrical supply
3.2 B a s i c     O p e r a t i o n
to the sequence control, it
(compensation and optimiser
automatically detects the devices
functions disabled)
3.2.1 On a call for the boilers to
Note: The boilers must be powered
operate, generated either by the
and switched on for the sequence
sequence control’s heating time-clock,
control to detect them.
an external time-clock or BMS, the
The control then commences                 sequence control changes from
communication with the boilers’ main        Standby to Active mode. This is
control PCB (modulating boilers) or         indicated on the sequence control
sequencing interface module (on/off         display. The heating primary
and high/low boilers) via the serial        circulation pump will be started, the
data bus. The sequence control              sequence control will register a 100%
communicates in turn with each              boiler system firing rate (indicated on
device in a continuous sequence.            the display), and the lead boiler
instructed to fire. The remaining
At each communication the boiler or
boilers will then be instructed to fire, in
sequencing interface module is sent
sequence, with a delay of 30 seconds
details of whether it should be firing or
between boilers.
not, and at what rate it should be
firing. The red data indicator light        3.2.2 The boiler firing order will
(marked ‘IOIOIOI’ on the boiler fascia,     depend on the ‘Firing Order’ setting. If
and ’Communicating’ on the                  ‘Fixed Sequence’ is selected, then the
lead boiler will always be boiler 1. If        boiler system firing rate of 73%, and to
‘Lead Boiler Shift’ is selected, the lead      switch on again when the boiler
boiler is rotated on a weekly basis            system firing rate increased to 76%.
such that, during week 2 boiler 2 is the
2)    High/Low Cascade
lead boiler, and during week 3 boiler 3
is the lead boiler. It is also possible to     Example - 4 high/low boiler system.
select a number of fixed lead boilers,
As the required boiler system firing
rotating the remaining boilers, which
rate determined by the sequence
can be desirable if a combination of
control reduces, the boilers will be
switched in the sequence as shown in
boilers are installed. Also if a
Figure 3.2.3.2 below.
combination of on/off and high/low
boilers are installed, the on/off boilers      Figure 3.2.3.2
will be fixed as the last in the
sequence, whilst the lead boiler is             System        Blr 1   Blr 2    Blr 3   Blr 4
shifted between the high/low boilers.
100%          HIGH HIGH HIGH HIGH
3.2.3 As the water flow temperature
87%           HIGH HIGH HIGH LOW
approaches the desired set point the
sequence control will begin to reduce           75%           HIGH HIGH HIGH OFF
the total boiler firing rate by                 62%           HIGH HIGH LOW            OFF
sequencing the boilers dependent on             50%           HIGH HIGH        OFF     OFF
the boiler type and sequence mode               37%           HIGH LOW         OFF     OFF
25%           HIGH    OFF      OFF     OFF
1)     On/Off Cascade                           12%           LOW     OFF      OFF     OFF
Example - 4 on/off boiler system.               0%            OFF     OFF      OFF     OFF
This assumes the boiler low fire rate is
50% of the high fire rate. The
sequence control also includes a
‘boiler low fire rate’ setting to give
Figure 3.2.3.1 below.
more accurate boiler system firing rate
Figure 3.2.3.1                                 control. With a setting of 30% for the
boiler low fire rate, this would (in this
System        Blr 1   Blr 2   Blr 3   Blr 4
example) cause boiler no. 4 to switch
to low fire at a boiler system rate of
100%          ON      ON      ON      ON      82%. The ‘switching hysteresis’ setting
75%           ON      ON      ON      OFF     also operates in this mode.
50%           ON      ON      OFF     OFF
3)    Low/Low Cascade
25%           ON      OFF     OFF     OFF
Example - 4 high/low boiler system.
0%            OFF     OFF     OFF     OFF
The sequence control includes a                rate determined by the sequence
programmable ‘switching hysteresis’            control reduces, the boilers will be
setting to prevent spurious on/off             switched in the sequence as shown in
switching of the boilers. With a setting       Figure 3.2.3.3 (p7). The ‘switching
of ‘3%’, this would (in this example)          hysteresis’ and ‘boiler low fire rate’
cause boiler no. 4 to switch off at            settings also operate in this mode.
HAMWORTHY HEATING LTD                     MILTON                              500001104/C
Figure 3.2.3.3                                 Figure 3.2.3.4b
System        Blr 1   Blr 2   Blr 3   Blr 4    System        Blr 1   Blr 2    Blr 3   Blr 4
Firing Rate                                    Firing Rate
100%          HIGH HIGH HIGH HIGH              80%           100% 100% 100% 20%
87%           HIGH HIGH HIGH LOW               79%           100% 100%        80%     36%
75%           HIGH HIGH LOW LOW                78%           100% 100%        80%     32%
62%           HIGH LOW        LOW LOW
77%           100% 100%        80%     28%
50%           LOW     LOW     LOW LOW
76%           100% 100%        80%     24%
37%           LOW     LOW     LOW     OFF
75%           100% 100%        80%     20%
25%           LOW     LOW     OFF     OFF
12%           LOW     OFF     OFF     OFF      74%           100% 100%        76%     OFF
0%            OFF     OFF     OFF     OFF     rate determined by the sequence
4)     Modulating Cascade
modulated in the sequence as shown
Example - 4 modulating boiler system.          in Figure 3.2.3.5 below.
As the required boiler system firing           Figure 3.2.3.5
System        Blr 1   Blr 2    Blr 3   Blr 4
in Figure 3.2.3.4a below.                       100%          100% 100% 100% 100%
90%           90%     90%      90%     90%
Figure 3.2.3.4a
80%           80%     80%      80%     80%
System        Blr 1   Blr 2   Blr 3   Blr 4    70%           70%     70%      70%     70%
50%           50%     50%      50%     50%
100%          100% 100% 100% 100%
30%           30%     30%      30%     30%
90%           100% 100% 100% 60%
20%           20%     20%      20%     20%
80%           100% 100% 100% 20%
15%           20%     20%      20%     OFF
70%           100% 100%       80%     OFF
10%           20%     20%      OFF     OFF
50%           100% 100%       OFF     OFF
5%            20%     OFF      OFF     OFF
30%           100%    20%     OFF     OFF
0%            OFF     OFF      OFF     OFF
20%           80%     OFF     OFF     OFF
10%           40%     OFF     OFF     OFF     Note: As the required system firing
0%            OFF     OFF     OFF     OFF     rate falls below 20%, the boilers are
stepped off in turn. The ‘switching
As the minimum firing rate of the
hysteresis’ setting also operates in this
modulating boilers is 20% (5 to 1
turndown) the sequence control
incorporates intelligence to ensure            3.2.4 Should the system load
smooth linear boiler system                    subsequently increase, the sequence
modulation at the boiler switch off            control will instruct the boilers to step
point as illustrated in Figure 3.2.3.4b        on / modulate upwards to match the
above.                                         new higher load.
5)     Modulating Unison                       3.2.5 During operation should a
boiler fault occur (ignition lockout)
Example - 4 modulating boiler system.
preventing its operation, the sequence
As the required boiler system firing           control will automatically adjust the
boiler sequencing to compensate for          temperature settings. The relationship
the non-operational boiler.                  between the outside air temperature
and the water flow temperature is
Note: This is applicable only to
determined by a temperature ratio
Hamworthy Heating modulating
setting and an offset setting (see
Figure 3.4 (p9). The sequence control
3.2.6 At the end of the time-clock           automatically adjusts the boiler firing
period the sequence control will             rates to match the flow temperature
instruct all of the boilers to switch off.   set point as it changes.
The circulation pump will continue to
3.5 Summer Shutdown Function
run for an overrun period, to remove
residual heat from the boilers, and
then shut down.                              The sequence control can
automatically shut down the heating
3.3 Remote       Modulation      Control
system when the outside air
temperature reaches a programmable
The sequence control software                set point. Operation of this function is
includes a ‘Master’ setting which            indicated on the display.
enables the boiler system firing rate to
3.6 Optimum        Start     Function
be controlled by a remote BMS control
via a 0 to 10V analogue signal. Refer
to Section 5.2.6 (p23) for setting           3.6.1 When the optimum start
details. In this operating mode all          function is utilised the heating time-
other Milton functions are disabled.         clock settings become the times at
which the desired room temperature
Note: As the boiler firing rate is
set point is to be achieved, rather than
determined by an external control
the times at which the heating is to
the Milton water temperature
sensor is not required.
In the time prior to the start of the
In this mode of operation the
building occupancy period, the
sequence control remains ‘Active’
sequence control continuously
constantly (with circulation pump
monitors the outside air and room
output on). The sequence control
temperatures. Based on these and the
constantly monitors the level of the 0
desired occupancy room temperature
to 10V analogue signal from the BMS
set point, the sequence control
control. At a level of the signal of 0.0V
determines the duration of the preheat
the sequence control will instruct all
period required to raise the room
boilers to be off. Between signal 0.1V
temperature to the desired level. The
and 10.0V the sequence control will
heating system is started when the
vary the boiler system firing rate
required preheat time equals the
linearly between 1 and 100%,
remaining time prior to the start of the
controlling the boilers as described in
Section 3.2 (p5).
2 settings are provided to adjust the
3.4 Outside Air Temperature
preheat duration - Fr, a factor relating
Compensation Function Operation
to the room temperature, and Fa, a
The sequence control can                     factor relating to the outside air
automatically adjust the water flow          temperature. The factory settings for
temperature set point in relation to the     these factors are Fr = 10, and Fa = 1.
outside air temperature, between             These settings will allow 66 minutes of
m a x i m u m a n d m i n i m um f l o w     preheat to raise the room temperature
HAMWORTHY HEATING LTD                  MILTON                           500001104/C
Figure 3.4 - Compensation Function Characteristic Graph
Compensation Slope Setting
(with slope set at 2 to 1)
Compensated Water Flow Temperature Setting - &#176;C
70                                              etting
60                                     pe
3t                     ing
50                                slo
4               se
to                ttin
40                                               g
30                                     se
0   2   4   6    8    10     12   14     16         18   20    22   24
Outside Air Temperature - &#176;C
(with offset set at 0)
80                         +15
+10 ffset se
of        ttin
70                         +5 fset se g
offs       ttin
0 o et sett g
ffse        in
60                          -5 o t sett g
ffse     in
-10       t se g
of       ttin
50                         -15 fset se g
offs      t
et s ting
40                                           ng
HAMWORTHY HEATING LTD                                                          MILTON                                  500001104/C
from 0 to 20&#176;C with an outside air          room temperature set point is
temperature of 0&#176;C. That is 3 minutes       provided. The heating system is
per &#176;C rise of room temperature and         operated should the room temperature
0.3 minutes per &#176;C difference between       fall below the set point. When the
the outside air temperature and             night set-back room temperature is
desired room temperature.                   achieved the boilers are switched off
and the pump switched off after the
The preheat duration can be limited by
overrun time.
a ‘Maximum Preheat’ setting.
The night set-back function can be
3.6.2 The optimum start function
includes a self-learning facility to tune
the system to each installation. This       3.9 Frost     Protection     Function
works by adjusting the Fa factor based      Operation
on how much too early or too late the
3.9.1 A frost protection outside air
desired temperature was actually
temperature setting is provided, which
should the outside air temperature fall
The self-learning facility can be           below it, during a non occupancy
disabled to fix the Fa factor.              period, will cause the sequence
control to operate the circulation pump
3.6.3 The optimum start function
to ensure that remote sections of the
cannot be used in conjunction with an
heating pipework do not freeze. An
external time-clock control.
outside air temperature sensor is
3.7 Daytime Optimisation Function           required for this function.
3.9.2 A frost protection water flow
3.7.1 This function provides control        temperature setting is also provided,
of the room temperature during              which should the water temperature
occupancy periods. When the desired         fall below it, during a non occupancy
room temperature set point is               period, will cause the sequence
achieved the sequence control               control to fire the boilers, to maintain
instructs the boilers to switch off, and    the water temperature 20&#176;C above the
the circulation pump is switched off        set point. Once the required water
after its overrun period.                   temperature is achieved the boilers
Should the room temperature
subsequently fall below the set point       3.9.3 It is possible to disable the
during the occupancy period, the            outside air temperature based action
heating system is restarted to maintain     or both of the frost protection actions.
the room temperature set point.
3.10 Safety     Interlock      Circuit
3.7.2 This function can be disabled         Operation
to allow the boilers to remain in
If any of the devices connected to the
operation when the room temperature
safety interlock circuit break the
set point is achieved.
circuit, the sequence control will
3.8 Night      Set-Back      Function       immediately instruct the boilers to shut
Operation                                   down. On rectification of the fault
condition and remaking of the safety
This function provides control of the
interlock circuit, the sequence control
room temperature during non
will automatically instruct the boilers
occupancy periods. A night set-back
3.11 Override Functions Operation         can then be fixed in position using
suitable fixings for the type of
Refer to section 2.0 Of the Milton
construction of the wall to which it is to
boiler sequence control user’s
instruction manual for details of the
operation of the override functions:      2off mounting holes are provided in
the wiring base (refer to Figure 4.1 for
Remote override switch
hole details).
Remote holiday override switch
The wiring base is supplied complete
3.12 Data Logging Operation               with 2off removable gland plates, each
having 2off 20mm dia. knockout holes
Refer to section 3.2.7 Of the Milton
for cable conduit connection.
instruction manual for details of the     4.2 Electrical Connections
operation of the data logging function.
All wiring to the sequence control must
4.0 INSTALLATION                          be in accordance with the IEE
Regulations, and any local regulations
NOTE!    IF IN        ANY DOUBT
CONSULT      A        QUALIFIED
ELECTRICIAN.                              NOTE! IF IN ANY DOUBT CONSULT
4.1 Control Location
The site wiring connection terminals
The Milton boiler sequence control is
are shown in Figure 4.2 (p12).
designed for wall mounting on its
wiring base. It should be positioned at   4.2.1 Electrical Supply
a point of easy access at an
The electrical mains connection must
approximate height of 1.5m.
be via a double pole, fused isolator
To mount the sequence control,            with a contact separation of at least
unfasten the screw accessible from        3mm in all poles, positioned adjacent
the front of the control to separate it   to the sequence control.
from its wiring base. The wiring base
Note! The supply to the sequence
Figure 4.1 - Mounting Holes               control must not be interrupted by any
other controls, such as external time-
50           2 HOLES O4
clocks or building management
4.2.2 Primary Circulation Pump
The primary circulation pump must be
connected to the electrical supply via
a fused isolator with a minimum
contact separation of 3mm in all poles.
The sequence control provides a relay
contact to control operation of the
circulation pump. This relay contact
should be used to operate the
circulation pump contactor. A hand/off/
auto switch should also be
incorporated into this control circuit.
Refer to Figure 4.2 (p12) for details.
HAMWORTHY HEATING LTD               MILTON                           500001104/C
- WIRING BASE EARTH PILLAR
230V ~ 50Hz SUPPLY CONNECTED VIA A 3
POLE FUSED ISOLATOR WITH 3mm MINIMUM                                                                              - LIVE SUPPLY INPUT
CONTACT SEPARATION IN ALL POLES
- NEUTRAL SUPPLY INPUT
VIA FUSED
- PRIMARY CIRCULATION PUMP RELAY CONTACT
- 24V dc OUTPUT
(LINK TERMINALS 5 &amp; 9 IF NOT UTILISED)                                                                                                                                                                                                           - 24V dc OUTPUT
EXTERNAL TIME-CLOCK /
NOTE: BOILERS MUST ALSO BE INDIVIDUALLY
REMOTE OVERRIDE CONTROL                                                                                        - EXTERNAL TIME-CLOCK/REMOTE OVERRIDE INPUT
INTERLOCKED TO THE SYSTEM SAFETY DEVCES.                                                                         REMOTE
HOLIDAY                                                                                                                             - REMOTE HOLIDAY OVERRIDE INPUT
CIRCULATION PRESSURISATION                                            FLUE FAN                                  CONTROL                                                                                                                              - SAFETY INTERLOCK INPUT
PUMP FLOW     UNIT SAFETY                                             PROVING
SWITCH       CIRCUIT                                                SWITCH                                                                                                                                                                        - SEQUENCER SERIAL DATA BUS GROUND
Figure 4.2 - Site Wiring Schematic
- SEQUENCER SERIAL DATA BUS SIGNAL
- REMOTE MODULATION CONTROL 0 TO 10V SIGNAL
- REMOTE MODULATION CONTROL 0 TO 10V GROUND
REMOTE MODULATION CONTROL                                                                                       - NOT USED
MILTON BOILER SEQUENCE CONTROL
0 TO 10V ANALOGUE SIGNAL
FROM EXTERNAL BMS CONTROL
- TEMPERATURE SENSOR GROUND
‘SIM’*
CIRCULATION PUMP HAND/OFF/AUTO SWITCH
- WATER FLOW TEMPERATURE SENSOR INPUT
- OUTSIDE AIR TEMPERATURE SENSOR INPUT
- ROOM TEMPERATURE SENSOR INPUT
MILTON OUTSIDE AIR
MILTON WATER FLOW
NOTE: REFER ALSO TO BOILER AND ‘SIM’* LITERATURE
HAMWORTHY HEATING LIMITED MODULATING BOILERS
HAMWORTHY HEATING LIMITED ON/OFF &amp; HIGH/LOW BOILERS
*’SIM’ - SEQUENCING INTERFACE MODULE
500001104/C
Note!     The sequence control relay         Wire the second boiler to the lead
contact must NOT be used to directly         boiler terminals (‘S1 to ‘S1’ and ‘S2’ to
switch the electrical supply to the          ‘S2’). Continue this until all of the
circulation pump.                            boilers are wired together.
4.3 Boiler Control Connections               4.4 Control Input Connections
The boilers are connected to the             The sequence control provides the
sequence control via a 2 wire serial         facility for a number of control inputs
data bus link. Shielded cabling must         from external devices including time-
not be used for these connections.           clocks, building management systems
and system safety devices. Refer to
4.3.1 On/Off and High/Low Boilers
Figure 4.2 (p12) for details.
Hamworthy Heating Limited on/off and
4.4.1 0 to 10V Remote Modulation
high/low boilers will be supplied with
optional ‘sequencing interface
modules’, which must be fitted to the        This is a low voltage signal input and
boiler control panels. Refer to the          must only be connected to a suitable 0
installation instructions supplied with      to 10V signal.
the interface module for details.
Connect the 2 wire analogue signal to
Having installed the interface modules       terminal ‘12’ and ground to terminal
and made the wiring connections              ‘13’. Refer to Figure 4.2 (p12) for
between the interface modules and            details.
boiler control PCBs, the ‘bus’ control
4.4.2 Safety Interlock Circuit
This circuit operates at 24V dc and
Wire the lead boiler interface module
must only be connected to volt free
to the sequence control boiler control
output terminals (terminal ‘10’ on
Milton to ‘9’ on interface module,           Connect the safety devices in series
terminal ‘11’ on Milton to ‘10’ on           across terminals ‘5’ and ‘9’.
interface module - refer to Figure 4.2
The boilers must also be individually
p12). Wire the second boiler interface
interlocked, via their remote on/off
module to the lead boiler interface
control terminals, to any system safety
module terminals (‘9’ to ‘9’ and ‘10’ to
devices required for their safe
‘10’). Continue this until all of the
operation. Refer to individual boiler
boilers are wired together.
installation manuals for details.
4.3.2 Modulating Boilers
Note! If no safety devices are to be
All Hamworthy Heating Limited                connected a setting is provided to
modulating boilers are fitted with           disable this function. Failure to disable
dedicated Milton communication input         the function will prevent the boilers
terminals, labelled ‘S1’ and S2’. Refer      from operating.
also to the specific boiler’s installation
4.4.3 External Time-clock (Optional)
manual for terminal details.
Wire the lead boiler to the sequence
control boiler control output terminals
(terminal ‘10’ on Milton to ‘S2’ on
boiler, terminal ‘11’ on Milton to ‘S1’      Connect the time-clock control across
on boiler - refer to Figure 4.2 p12).        terminals ‘6’ and ‘7’.
HAMWORTHY HEATING LTD                  MILTON                          500001104/C
4.4.4 Remote       Override     Switch      type which will provide more accurate
(Optional)                                  temperature control in most
The remote override function is not
available when an external time-clock       The water flow temperature sensor
is connected to the Milton control, it is   must be installed at the outlet of the
intended for use in conjunction with        flow header from the boiler system.
the sequence control internal time-         There must be no connections taken
clock function.                             from the flow header between the
boilers and the sensor position.
The remote override switch is
connected across terminals ‘6’ and ‘7’.     The insertion type sensor consists of a
brass probe mounted to a plastic
Note! This circuit operates at 24V dc,
housing, supplied with a brass pocket
mains voltages MUST NOT be fed
with a R&#189; thread (refer to Figure
onto these terminals.
4.5.2a p15). Fit the sensor pocket to a
4.4.5 Remote Holiday          Override      &#189;” BSP socket welded to the flow
Switch (Optional)                           header, allowing an insertion depth to
the centre line of the pipe.
This switch is connected across
Alternatively, the sensor can be
terminals ‘5’ and ‘8’.
installed at a pipe bend as shown in
Note! This circuit operates at 24V dc,      Figure 4.5.2a (p15). Insert the sensor
mains voltages MUST NOT be fed              probe into the pocket and fix in place
onto these terminals.                       with the locking screw on the side of
The clamp-on type sensor consists of
a spring loaded surface temperature
Note: No temperature sensors are            probe mounted to a plastic housing,
required to be connected to the             supplied with a clamping strap device
sequence control if the ‘Master             suitable for clamping up to 4inch pipes
Control’ setting is set to ‘BMS’ for        maximum (refer to Figure 4.5.2b p16).
remote modulation control via a 0-10V       Position the sensor on the pipe and
signal from an external building            pass the strap through the rectangular
management control system.                  hole in the sensor and around the
The Milton system temperature               pipe. Assemble the clamping
sensors are of the PT1000 platinum          mechanism as shown in Figure 4.5.2b
resistance type. Standard conduit           (p16) and fasten the sensor in place
cabling is suitable for connecting the      by tightening the clamping strap nut.
sensors, special shielded cabling           Do not over tighten.
must not be used.                           The water sensor housings
4 types of sensor are available -           incorporate an M20 threaded conduit /
Insertion water sensor complete with        gland connection for cable entry.
pocket, clamp-on water sensor, room         Remove the housing cover by
sensor and outside air sensor.              unfastening the 2 screws and wire the
water sensor to terminals ‘17’ and ‘18’
4.5.2 Water      Flow    Temperature        on the sequence control. Replace the
Sensor                                      housing cover.
Either the insertion type or clamp-on       4.5.3 Outside Air       Temperature
type can be used, however                   Sensor (Optional)
recommend the use of the insertion          The optional outside air temperature
sensor is required for the outside air
HAMWORTHY HEATING LTD                 MILTON                         500001104/C
Figure 4.5.2a - Insertion Type Water Flow Temperature Sensor
R 1/2 THREAD
END OF POCKET TO BE ALIGNED WITH PIPE CENTRE LINE
M20 GLAND CONNECTION
79.5 (POCKET)
HAMWORTHY HEATING LTD           MILTON                         500001104/C
Figure 4.5.2b - Clamp-on Type Water Flow Temperature Sensor
HAMWORTHY HEATING LTD          MILTON                         500001104/C
temperature compensation, optimum            be subject to draughts from outside
start and 2 stage frost protection           and where it will not be exposed to
functions.                                   direct sunlight in order to ensure that
the sensor reading is representative of
The outside air sensor consists of a
the actual ambient room temperature.
plastic housing with integral mounting
The sensor should be mounted at a
flange. The housing incorporates an
height of approximately 1.5m above
M20 threaded conduit / gland
connection, which when used in
conjunction with a suitable conduit or       Remove the housing from the back
gland connector provides IP65                box by unfastening the 2 screws. Fix
protection.                                  the supplied back box to the wall using
suitable countersunk head screws, or
The sensor must be installed on an
discard if a suitable back box is
outside, north facing wall, away from
already installed. Wire the room
any air vents, pipes, illuminated signs
sensor to terminals ‘16’ and ‘20’ on the
or any other device that could affect
Milton control. Fasten the housing to
the ambient temperature local the
the back box using the 2 screws
Note!     Exposure of the sensor to
It may be desirable for some
direct sunlight at any time during the
installations to install sensors in a
day will severely affect the
number of positions to obtain an
performance of the compensation and
average room temperature reading.
optimum start functions.
This can provide more accurate
The sensor can be fixed to the wall          operation of the optimum start and
using the mounting holes in its plastic
Figure 4.5.4b - Multiple Room Temp.
housing, or held in place by the cable
conduit (see Figure 4.5.3 p18).
Remove the housing cover by                                 SENSOR 1
unfastening the 2 screws and wire the
outside air sensor to terminals ‘17’ and
16                                  20
‘19’ on the sequence control. Replace
the housing cover.
4.5.4 Room Temperature Sensor
(Optional)                                           SENSOR 1      SENSOR 2
The optional room temperature sensor
is required for the optimum start,            16                                  20
daytime optimisation and night set-
back functions.
The room temperature sensor consists                 SENSOR 1      SENSOR 2
of a plastic housing supplied with a                 1 2 3         1 2 3
surface mounting back box. The
sensor housing can also be mounted            16                                  20
to any standard flush or surface
mounting back box. See Figure 4.5.4a
SENSOR 3      SENSOR 4
The sensor should be mounted on an
internal wall at a point where it will not
Figure 4.5.3 - Outside Air Temperature Sensor
R 96.5
HAMWORTHY HEATING LTD            MILTON                               500001104/C
Figure 4.5.4a - Room Temperature Sensor
45 TYP.
87                      24
HAMWORTHY HEATING LTD          MILTON           500001104/C
daytime optimisation functions. Figure      fitted to each on/off or high/low boiler
4.5.4b gives wiring connection details      is set to the correct position. Switch
for combinations of 1, 2 and 4 sensors      ‘SW1’ should be set to position ‘1’ on
(a 3 sensor combination is not              the lead boiler, position ‘2’ on the
possible). Note the different terminal      second boiler and so on up to a
connections for the 2 sensor                maximum of 9 boilers. Refer also to
combination.                                the boiler’s installation manual for
Set the boiler control thermostat to a
When all of the required connections
temperature 10&#176;C above the intended
have been made to the wiring base, fit
mixed flow temperature setting in the
the sequence control to the wiring
flow header, up to the maximum
base, taking care to align the PCB
setting of the control thermostat. This
edge connector into the terminal strip
will prevent the boilers’ own
in the base, and push firmly into place.
temperature controls from interfering
Fasten the screw in the front of the
with the sequence control’s
control to fix it in place.
temperature control action.
Switch on the electrical supply to all of
5.1   Pre-Commissioning Checks              the devices connected to the
sequence control and ensure that the
5.1.1 Carry out the electrical and gas
boilers are switched on (amber power
installation and water circulation
on indicator on boiler fascia
system checks as detailed in the
commissioning section of the boiler’s
installation manual.                        Switch on the electrical supply to the
sequence control. The sequence
5.1.2 Ensure that the electrical
control will initiate and automatically
supplies to the sequence control and
detect all of the connected devices
all of the equipment connected to it
and initiate communication with them.
are isolated. Remove the sequence
control from its wiring base, and check     Note! The sequence control will fail to
that the wiring connections are correct     detect and initiate communication with
and soundly made.                           the boilers if they are not powered and
Note! Wiring MUST be checked by a
suitably competent person.                  The Milton boiler sequence control is
now ready to be programmed.
Replace the sequence control on its
wiring base and fasten in position.         5.2 Programming
5.1.3 Ensure that the system                5.2.1 Program Menu Overview
circulation pump(s) are running by
The Milton boiler sequence control
setting them to their ‘hand’ control
program settings are separated into 2
sections - the engineer’s settings and
The boilers can now be commissioned         user’s settings. The engineer’s
as detailed in their installation           settings determine how the system
manuals.                                    operates and which functions are to
be used. The user’s settings include
Once boiler commissioning is
time-clock, holiday period and room
complete isolate the electrical supply
temperature settings. Both are
to all of the boilers and ensure that the
protected by 4 digit numerical security
rotary switch (marked ‘SW1’) on the
main PCB of each modulating boiler,
or on the sequencing interface module       The engineer’s settings security code
HAMWORTHY HEATING LTD                 MILTON                        500001104/C
is factory set to ’1805’ and cannot be       installation are automatically hidden.
changed. It is advisable that ‘casual’
5.2.2 Keypad Operation
users do not have access to this
security code.                               The ‘ ’ and ‘ ’ keys are used to scroll
up and down through the menu lists
The user’s settings security code is
and also to change setting values.
factory set to ‘1000’, but can be
changed from within the user’s               The ‘ ’ and ‘ ’ keys are used to
settings, or if forgotten, from within the   move the flashing cursor position on
engineer’s settings.                         individual screens.
Refer to the Milton boiler sequence          The ‘ ’ key is used to access the
control user’s instruction manual (HHL       engineer’s settings menu, select menu
pt. no. 500001105) for further details       items and to enter modified setting
of the user’s settings.                      values.
The engineer’s settings consist of a         The ‘ ’ key is used to access the
main menu, with a numbered list of           user’s settings menu, return to the
options, each of which lead to a sub         previous menu level or to exit the
menu.                                        program settings.
The submenus consist of a number of          5.2.3 P r o g r a m m i n g   Screen
screens with various settings relevant       Timeout
to the particular submenu.
If no keys are pressed for 1 minute the
In order to simplify programming of the      sequence control will automatically
Milton control, submenus and settings        return from the programming screens
which are not relevant to a particular       to the run mode screens.
5.2.4 Overview - Enter engineer’s settings menu and navigate submenus
a) To enter the engineer’s settings menu
press and hold the ‘ ’ key for 5 seconds
Enter MENU CODE:
until the security code screen is                     0000
displayed. Note that the left hand code
digit is flashing to indicate the cursor
b) Use the ‘ ’ and ‘ ’ keys to enter the
first digit of the code. Use the ‘ ’ and ‘ ’
keys to move the cursor position to enter             1805
c) To enter the code press the ‘ ’ key. If
the code entered was incorrect the
&#200;1 Set MASTER
control will give the option to try again. If    2 Set CLOCK
the code entered was correct the main
menu screen will be displayed.
d) Use the ‘ ’ and ‘ ’ keys to scroll up
and down through the main menu list.
4 Set OPTIMISER
The ’ ’ symbol on the left of the screen        &#200;5 Set SEQUENCER
indicates the currently selected menu
Note: There are more than 2 menu items.
The screen displays 2 at a time.
e) The full menu list is as shown. Note
that depending on various setting values
1 Set MASTER
some of the submenus may be hidden.             2 Set CLOCK
3 Set COMPENSAT
&#200;5 Set SEQUENCER
6 Set CIRCULATN
7 Set FROST PRT
8 Set OVERRIDES
9 Set MENU CODE
f) To select a menu item press the ‘ ’
key. The submenu will be displayed. Note
FLOW TEMPS (&#176;C)
that the submenu setting title flashes to      Max 090 Min 015&#210;
indicate the cursor position.
g) With the cursor on the setting title, use
the ‘ ’ and ‘ ’ keys to scroll through the
submenu screens.                               Fixed Sequence &#210;
h) To return to the main menu press the
‘ ’ key.
h) To exit from the engineer’s settings
menu press the ‘ ’ key. The run mode
Fri 07-Mar-2003
screen will be displayed.                      15:31 Air: 12&#176;C
5.2.5 Overview - Modifying a setting value
a) Enter the engineer’s settings menu and
select the sequencer settings submenu
as described above. Select the flow            Max 090 Min 015&#210;
temperature limits setting screen.
b) Use the ‘ ’ and ‘ ’ keys to move the
flashing cursor position from the setting
title to the setting value. The cursor can     Max 080 Min 015?
be positioned on each individual digit of a
numerical setting. Use the ‘ ’ and ‘ ’
keys to modify the value of each digit of a
Note that when a setting is changed the        Max 082 Min 015?
‘ ’ symbol on the right of the screen
changes to a ‘?’ to indicate that the
displayed value is not the current value       FLOW TEMPS (&#176;C)
Max 082 Min 065?
HAMWORTHY HEATING LTD                MILTON                500001104/C
5.2.5 Overview - Modifying a setting value (continued)
c) The sequence control will not allow a
setting value outside the allowable range
for each setting to be displayed. In this       Max 010 Min 065?
example the allowable setting range is 0
to 120&#176;C. The control will not allow the
first digit to be set to ‘1’ until the last 2   FLOW TEMPS (&#176;C)
digits are set to ‘20’ or lower.
Max 110 Min 015?
d) To enter the new setting value(s) into
the program memory, press the ‘ ’ key.
The ‘?’ symbol on the right of the screen       Max 110 Min 065&#210;
will change to a ‘ ’. The flashing cursor
position will automatically return to the
setting title.
e) Ensure that the cursor position is on
the setting title before using the ‘ ’ and
‘ ’ keys to scroll to the other setting         Fixed Sequence &#210;
screens in the submenu.
Note that some settings are control
options rather than numerical values, as
f) Positioning the cursor on the setting
value in this case will cause the whole
setting option description to flash. Use the    Lead Blr Shift ?
‘ ’ and ‘ ’ keys to select between the
g) When all of the required settings in the
submenu have been modified, use the ‘ ’
key to return to the main menu and then         15:35 Air: 12&#176;C
exit to the run mode screen.
5.2.6 Master Control Mode Submenu
a) Master Control Setting                       CONTROL MASTER
This screen is used to determine the
modulation control source, and has 2
Milton      &#210;
available options. The first is ‘Milton’
whereby the boiler system firing rate is
determined internally by the Milton
sequence control based on its water
temperature sensor reading. The second
is ‘BMS’ whereby the boiler system
modulation rate is determined by an
external building management control
system and is transmitted to the Milton
sequence control via a 0-10V analogue
signal (refer to Section 3.3 p8 for further
HAMWORTHY HEATING LTD                MILTON               500001104/C
5.2.6 Master Control Mode Submenu (continued)
Note: When the ‘BMS’ setting is
selected, the majority of other functions
are disabled. Only the ’Sequencing’ and
’Menu Code’ submenus are available.
5.2.7 Clock Submenu
Note: If the master control setting is
‘BMS’ this submenu is not available.
internal   &#210;
a) Clock Source Setting
This screen has 2 available options,
‘internal’ whereby the heating system is
started based on the sequence control’s
own time-clock, or ‘external’ whereby the
heating system is started based on the
external time-clock input.
5.2.8 Compensation Submenu
Compensated &#210;
a) Compensation Mode Setting
This setting has 2 available options,
‘Fixed Temp’ whereby the outside air
temperature compensation function is
disabled and the sequence control will
control to a single fixed water flow
temperature, or ‘Compensated’ whereby
the compensation function is enabled.
b) Compensation Slope Setting                 COMP SLOPE
Note: If the compensation mode setting        2.0&#176;C/&#176;C        &#210;
is ‘Fixed Temp’ this setting is not
This setting represents the amount by
which the water flow temperature set point
is reduced per &#176;C outside air temperature
rise. It can be set between 0.5 and 4.0 &#176;C/
&#176;C in 0.5 steps. Refer to Section 3.4 (p8)
c) Compensation Slope Offset Setting          SLOPE OFFSET
Note: If the compensation mode setting is         +00&#176;C    &#210;
‘Fixed Temp’ this setting is not available.
The reference point for the compensation
slope is 82&#176;C water flow temp. at –1&#176;C
outside air temp. This setting represents
HAMWORTHY HEATING LTD              MILTON             500001104/C
5.2.8 Compensation Submenu (continued)
an offset for the reference point, eg. with
an offset of +5&#176;C the water flow temp. will
be 87&#176;C at –1&#176;C outside air temp. It can
be set between –15&#176;C and +15&#176;C in 1&#176;C
steps. Refer to Section 3.4 (p8) for further
d) Summer Shutdown Temperature
off    20&#176;C    &#210;
This setting represents the outside air
temperature at which the heating is
switched off. It can be set between 0 and
30&#176;C in 1&#176;C steps. Also included on the
screen is a setting which enables the
function to be enabled/disabled - ‘off’
disables the function, ‘on’ enables the
5.2.9 Optimiser Submenu
OPT START MODE
Enabled (fixed)&#210;
a) Optimum Start Mode Setting
Note: If the time-clock source setting is
‘external’ this setting is not available and
optimum start is automatically disabled.
This setting has 3 available options. The
first is ‘Enabled (adapt)’ whereby the
optimum start is enabled with self
learning. The second is ‘Enabled (fixed)’
whereby the optimum start is enabled
without self learning. The third is
‘Disabled’ whereby the optimum start is
disabled and the heating starts at the
times dictated by the sequence control
internal time-clock.
b) Optimum Start Parameter Setting             OPT START PARS
Note: If the time-clock source setting is       Fr 010 Fa 001&#210;
‘external’ or the optimum start mode
setting is ‘disabled’ this setting is not
These 2 settings are used by the
sequence control to calculate the optimum
start preheat time. The factory settings
shown above, will allow a preheat time of
66 minutes to raise the room temperature
HAMWORTHY HEATING LTD               MILTON               500001104/C
5.2.9 Optimiser Submenu (continued)
from 0 to 20&#176;C with an outside
temperature of 0&#176;C. Refer to Section 3.5
(p8) for further details. Both settings can
be set between 1 and 100 in steps of 1.
c) Maximum Preheat Time Setting                 MAX PREHEAT TIME
9hrs    &#210;
This setting is used to limit the duration of
the optimum start preheat time. It can be
set between 1 and 9 hours in 1 hour
d) Room Temperature Control Mode
ROOM T CTL MODE
This setting is used to enable or disable
Disabled       &#210;
the daytime optimisation function to
control the room temperature during
occupancy periods. The setting options
are ‘Daytime Optim’ or ‘Disabled’.
e) Night Set-Back Mode Setting                  NIGHT S/BK MODE
the night set-back function to control the
room temperature during non-occupancy
periods. The setting options are ‘Enabled’
or ‘Disabled’.
5.2.10 Sequencer Submenu
a) Water Flow Temperature Set Point
This setting represents the limits of water
Max 082 Min 065&#210;
flow temperature set point for the
c ompens ati on     func t ion.    If  th e
compensation mode setting is set to
‘Fixed Temp’ then the fixed water flow
temperature set point is set to the
When non-condensing boilers are
installed, the minimum value must be at
least 65&#176;C to prevent condensate forming
in the boilers.
The values can be set between 0 and
117&#176;C in 1&#176;C steps. Do not set the
minimum value higher than the maximum
5.2.10 Sequencer Submenu (continued)
b) Temperature Control Proportional
and Integral Gains Settings
P &amp; I GAINS
PG 050 IG 005&#210;
These settings determine the response of
the sequence control water temperature
control action. The factory settings are
proportional gain PG = 50, and integral
gain IG = 5. For the majority of
installations these settings will provide
acceptable performance. However, if the
boiler system response is observed to be
very fast, for example where the full boiler
heat input is significantly greater than the
actual heating system load, it may be
advisable to reduce the gain settings. This
will cause the modulation action to start
reducing the boiler firing rate at a lower
water temperature and also slow down
the rate of change of boiler firing rate. If
the settings are adjusted it is advisable to
limit the change to steps of ‘5’ for the
proportional gain and steps of ‘1’ for the
integral gain. Observe the effect of the
new settings before making further
c) Sequencing Mode Setting                      SEQUENCING MODE
This setting has 5 available options to         On/Off Cascade &#210;
match the type of boilers to be controlled.
Refer to Section 3.2.3 (p6) for detailed
description of each of the available
Setting options as follows:
a) ‘On/Off Cascade’
b) ‘Hi/Lo Cascade’
c) ‘Lo/Lo’ Cascade’
d) ‘Modltn Cascade’
e) ‘Modltn Unison’
d) Firing Order Setting                         FIRING ORDER
This setting has 2 available options, ‘Lead     Lead Blr Shift &#210;
Blr Shift’ whereby the lead boiler is rotated
on a weekly basis, or ‘Fixed Sequence’
whereby the lead boiler is always boiler 1.
e) Number of Fixed Lead Boilers                 NO. FIXED LEAD
1       &#210;
Note: If the firing order setting is ‘Fixed
Sequence’ this setting is not available.
This setting allows a number of boilers to
be fixed as the first in the firing sequence
when the lead boiler shift option is used.
This is desirable when a combination of
are installed, in order to fix the
condensing boilers as the lead boilers to
benefit from their higher efficiency at
lower water flow temperatures. The fixed
lead boilers must be boiler nos. 1, 2, 3
etc. The firing sequence of the remaining
boilers will be rotated. The setting can be
adjusted between 0 and the total number
of boilers installed.
f) Switching Hysteresis Setting                 SET HYSTERESIS
Note: If the sequencing mode setting is                3%      &#210;
’Modltn Cascade’ or ’Modltn Unison’ this
This setting represents the switching
hysteresis in % at the on/off switching
point for on/off and high/low boilers. It can
be set between 1 and 5%, recommended
setting is 3%. Increasing the setting may
help reduce fast on/off cycling of the
boilers if this is observed.
g) Low Fire Rate Setting                        LOW FIRE RATE
Note: This setting is only available if the            50%        &#210;
sequencing mode setting is ‘hi/lo cascade’
or ‘lo/lo cascade’.
This setting represents the low fire rate of
high/low boilers as a percentage of the
high fire rate. It can be set between 10
and 90 % in 10% steps. The chart
overpage gives correct settings for the
HHL high/low ranges of boilers.
Boiler Model               Low Fire Rate
Purewell PC40                  80%
Purewell PC50                  60%
Purewell PC60                  50%
Purewell PC70                  40%
Purewell PC80                  40%
Purewell PC95                  40%
Purewell PC105                 40%
Purewell PC120                 30%
Warmwell W60                   60%
Warmwell W95                   40%
Warmwell W120                  40%
Warmwell W140                  30%
Wessex 100 M                   50%
h) Number of On/Off Boilers Setting             No. ON/OFF BLRS
Note: This setting is only available if the
0       &#210;
If a combination of on/off and high/low
boilers are installed this setting is used to
identify the number on/off boilers. It can
be set between 0 and the total number of
installed boilers.
Note: The on/off boilers must always be
the last in the sequence.
5.2.11 Circulation Pump Submenu
a) Circulation      Pump     Maintenance
Enabled    &#210;
This setting enables or disables the
circulation pump maintenance function
whereby the primary circulation pump is
run briefly at midnight each week on
Sunday, to prevent seizing during heating
system non-operational periods.
b) Circulation Pump Overrun Time
PUMP OVERUN TIME
This setting represents the duration of the
20 mins &#210;
circulation pump overrun time. It can be
set between 0 and 90 minutes in 1 minute
HAMWORTHY HEATING LTD                 MILTON              500001104/C
5.2.12 Frost Protection Submenu Settings
FROST PROT MODE
a) Frost Protection Mode Setting
2 stage      &#210;
There are 3 available options for this
setting. The first is ‘Disabled’ which
disables the frost protection function. The
second is ‘1 stage’ whereby frost
protection based on the reading of the
water flow temperature sensor is enabled.
The third is ‘2 stage’ whereby frost
protection based on both the water flow
and outside air temperature sensors is
enabled. Refer to Section 3.8 (p10) for
b) Minimum Water Temperature Setting             MIN WATER TEMP
Note: If the frost protection mode setting
is ‘Disabled’ this setting is not available.
08&#176;C    &#210;
This setting represents the minimum
water temperature at which the boiler
system is operated to prevent freezing of
the system. It can be set between 0 and
30&#176;C in 1&#176;C steps.
c) Minimum Outside Air Temperature
MIN OS AIR TEMP
+02&#176;C     &#210;
is ‘Disabled’ or ‘1 stage’ this setting is not
outside air temperature at which the
circulation pump is operated to prevent
freezing of remote parts of the heating
system. It can be set between –10 and
+10&#176;C in 1&#176;C steps.
5.2.13 Overrides Submenu
SAFETY INTLOCK
Enabled     &#210;
a) Safety Interlock Circuit Setting
operation of the safety interlock circuit
function. If no system safety devices are
connected to the circuit, then the setting
must be set to ‘disabled’ to allow boiler
HAMWORTHY HEATING LTD                 MILTON               500001104/C
5.2.13 Overrides Submenu (continued)
b) Remote Time-Clock Override Setting         REM CLOCK ORIDE
Note: If the time-clock source setting is        Enabled     &#210;
‘external’ this setting is not available.
remote time-clock override function. Refer
to section 2.2 of the sequence control
user’s operating instructions for further
c) Remote Holiday Override Setting            REM HLDAY ORIDE
This setting enables or disables the             Enabled     &#210;
remote holiday override function. Refer to
section 2.3 of the sequence control user’s
5.2.14 Security Code Submenu
a) User’s Security Code Setting                 USER MENU CODE
This screen allows the current user’s                1000      &#210;
setting menu security code to be viewed
and adjusted should it be forgotten or
unavailable to the engineer.
5.2.15 User’s Settings                      disconnecting the wires from the
sensor (isolate the electrical supply
Once the engineer’s settings have
to the sequence control first) and
been completed, enter the user’s
measuring the resistance across
settings referring to section 3.0 of the
terminals 1 &amp; 2 using a digital
Milton sequence control user’s
ohmmeter. The resistance will be
instruction manual (HHL pt. no.
1000Ω at 0&#176;C, and increases by 3.85Ω
500001105) for details.
per &#176;C above 0&#176;C.
5.3 Milton Operation Checks
5.3.3 Boiler Communication
5.3.1 On completion of programming
Check that the sequence control has
the control, if the time-clock is calling
detected all of the boilers by observing
for system operation the sequence
the boiler status screen (refer to
control will switch on the primary
section 1.0 of the user’s instructions),
circulation pump and instruct the
and observing the communication
boilers to operate.
indicators on the boiler fascias. If a
5.3.2 T e m p e r a t u r e   Sensor        boiler has not been detected, ensure
Operation                                   that is powered and switched on, then
reset the power to the sequence
The temperature sensor(s) fitted to the
sequence control do not require
calibration, however it is advisable to     5.3.4 Safety Interlock and Remote
check their operation using a suitable      Overrides Operation
Check the operation of the safety
A suspect sensor can be checked by          interlock circuit by simulating a fault on
each of the safety devices. Ensure        7.0 SERVICING
that the safety interlock screen on the
7.1 The Milton boiler sequence
sequence control registers the fault
control system requires no regular
(refer to section 1.0 of the user’s
servicing. However, an annual check
instructions), and that the boilers are
of the systems operation can be useful
to highlight any possible problems.
Check the operation of the remote
7.2 To allow servicing of on/off and
time-clock and holiday override inputs
high/low boilers, a hand/auto switch is
by switching the respective remote
included on the boiler’s main control
devices and observing the relevant
PCB, which should be set to the hand
override screen on the sequence
position to override control by the
control (refer to section 1.0 of the
Milton boiler sequence control. To
user’s instructions).
allow servicing of modulating boilers,
5.3.5 Completion                          use of rotary switch ‘SW1’ on the
boiler’s control PCB should be made
Finally, enter the engineer’s program
to override control of the boiler by the
settings in the tables shown in Figure
Milton boiler sequence control. Refer
5.3.5 on pages 38 &amp; 39 for future
to the boiler’s installation manual for
6.0 FAULT FINDING
Note!   The electrical supply to the
General fault finding is shown in         boiler must be isolated prior to
Figure 6.0 on pages 33 - 36. If the       changing the setting of the rotary
Milton boiler sequence control system     switch.
still cannot be operated satisfactorily
When overriding the sequence
after following the chart, consult your
controls operation of the boilers
local office of Hamworthy Heating for
ensure that the primary circulating
pump is operational by setting it to its
Note! Before carrying out any work        ‘hand’ control position.
ensure that the boiler is electrically
Return the hand/auto switch / rotary
switch to its original position on
IF IN ANY DOUBT CONSULT A                 completion of boiler servicing
QUALIFIED ELECTRICIAN.                    operations.
Refer also to the boiler’s installation
and servicing manual for details.
HAMWORTHY HEATING LTD               MILTON                          500001104/C
Fault                         Symptom                          Cause                                 Remedy
The heating system does not   Milton sequence control display Mains power is not supplied to the Checks mains supply wiring, fuse
operate                       not operating                   Milton sequence control            and isolator
Faulty Milton sequence control        Replace sequence control
Milton water temperature sensor Faulty wiring to water temperature Check and remedy wiring fault
reading shows ‘——’              sensor
Faulty water temperature sensor       Check and replace          water
Milton room temperature sensor Faulty wiring to water temperature Check and remedy wiring fault
Figure 6.0 - Fault Finding Part 1
reading shows ’——’. This will sensor
only prevent heating system
operation if the ‘daytime
optimisation’ function is utilised
Faulty water temperature sensor Check and replace water
Safety interlock circuit   status System safety        device      has Check and remedy system safety
showing ‘fault detected’          operated                             device fault
Faulty wiring to safety circuit       Check and remedy wiring fault
No system        safety     devices Set safety interlock circuit setting
connected                           to ‘Disabled’ (refer to section
Remote time-clock override status External time-clock control is Check operation of external time-
showing ‘none’ and an external    switched off                    clock device
time-clock is being utilised
Faulty wiring to external time- Check and remedy wiring fault
Fault                                 Symptom                             Cause                             Remedy
The heating system does not           Remote modulation control is No demand from external BMS Generate demand on external
operate (cont)                        being used and system firing rate control (0V signal from BMS) BMS control
Faulty wiring between Milton and Check and remedy wiring fault
external BMS control
Remote holiday override status Remote holiday override control is Switch off remote holiday override
shows ‘active’                 activated                          control
Figure 6.0 - Fault Finding Part 2
Heating status shows ‘standby’ Holiday period           has    been Delete holiday period in user’s
during time-clock on period    programmed                           settings (refer to section 3.2.4 of
user’s instructions)
Heating status shows ‘Sumr SD’ The outside air temperature has Disable summer shutdown
during time-clock on period    exceeded the summer shutdown function or increase the set point
temperature set point           temperature
Individual boiler(s) do not operate   Boiler number does not appear on    Sequence control has failed to Ensure boiler is powered and
boiler status screen,               detect boiler                  switched on. Reset power to
communication indicator on boiler                                  sequence control.
fascia not operating
Rotary switch ‘SW1’ on boiler     Check and set rotary switch
main control PCB or Sequencing    correctly (refer to section 5.1.3
Interface Module PCB set          and also to boiler installation
incorrectly                       manual)
Faulty boiler main control PCB or Replace boiler main control PCB
Sequencing Interface Module
Fault                                 Symptom                         Cause                               Remedy
Individual boiler(s) do not operate   Boiler number does appear on Other boiler fault                     Refer to fault finding instructions
(cont)                                sequence control boiler status                                      in boiler installation manual
screen, communication indicator
on boiler fascia operating
The boiler firing sequence is Boilers firing in order different to Rotary switch ‘SW1’ on boiler Check and set rotary switch
incorrect                     that shown on sequence control main control PCBs set incorrectly correctly (refer to section 5.1.3
boiler status screen                                               and also to boiler installation
The boilers’ temperature limiters Overheat indicator      on   boiler The primary circuit     circulation Check the pump        and    pump
repeatedly operate                fascias illuminated                 pump is not operating               control circuit
Figure 6.0 - Fault Finding Part 3
Pump overrun time too short         Increase pump overrun time
setting (refer to section 5.2.8)
A clamp-on water temperature        A clamp-on water temperature
sensor fitted to a large diameter   sensor fitted to a large diameter
header pipe is causing a high lag   header pipe is causing a high lag
in sensor response                  in sensor response
The heating system is unable to Room temperature low                  Incorrect positioning of the room Reposition the room sensor
achieve the desired room                                              temperature sensor is causing an correctly as described in section
temperature set point                                                 elevated temperature reading, 4.5.4
causing the daytime optimisation
function to operate prematurely
Incorrect positioning of the outside Reposition the outside air
air temperature sensor is causing temperature sensor correctly as
an elevated temperature reading, described in section 4.5.3
causing a low compensated water
Fault                          Symptom                 Cause                                Remedy
The heating system is unable to Room temperature low   C o m p e n s a t e d w a t e r f l o w Reduce compensation slope
achieve the desired room                               temperature too low due to s e t t i n g a n d / o r i n c r e a s e
temperature set point                                  incorrect compensation settings         compensation slope offset setting
(refer to section 5.2.5)
The maximum water flow Increase the maximum water
temperature setting is too low temperature set point setting
limiting the maximum heat input (refer to section 5.2.6)
Figure 6.0 - Fault Finding Part 4
The heating system exceeds the Room temperature high   Incorrect positioning of the room Reposition the room temperature
desired room temperature set                           temperature sensor is causing a sensor correctly as described in
point                                                  depressed temperature reading, section 4.5.4
preventing the daytime
optimisation function operating
C o m p e n s a t e d w a t e r f l o w Increase compensation slope
temperature too high due to s e t t i n g a n d / o r d e c r e a s e
incorrect compensation settings         compensation slope offset setting
The minimum water flow Decrease the minimum water
temperature setting is too high temperature set point setting
limiting the minimum heat input (refer to section 5.2.6)
Enable the daytime optimisation
function to switch off the heating
when the room temperature set
point is reached
Figure 5.3.5 - Installation Settings Part 1
ENGINEER’S SETTINGS
1) Master Control Mode Submenu Settings
a) Master Control Mode
2) Clock Submenu Settings
a) Clock Source
2) Compensation Submenu Settings
a) Compensation Mode
b) Compensation Slope                                              &#176;C/&#176;C
c) Compensation Slope Offset                                            &#176;C
d) Summer Shutdown Temperature                   on / off               &#176;C
3) Optimiser Submenu Settings
Enabled (adapt)
a) Optimum Start Mode                                 Enabled (fixed)
b) Optimum Start ‘Fr’ Parameter
c) Optimum Start ‘Fa’ Parameter
d) Maximum Preheat Time                                            hours
Daytime Optim
e) Room Temperature Control Mode
f) Night Set-Back Mode
4) Sequencer Submenu Settings
a) Water Flow Temperature Set Point - Max                               &#176;C
b) Water Flow Temperature Set Point - Min                               &#176;C
c) P &amp; I Control Gains - PG
d) P &amp; I Control Gains - IG
HAMWORTHY HEATING LTD               MILTON                  500001104/C
Figure 5.3.5 - Installation Settings Part 2
4) Sequencer Submenu Settings (continued)
On/Off Cascade
High/Low Cascade
e) Modulation Mode                               Low/Low Cascade
Modulating Cascade
Modulating Unison
f) Firing Order
Lead Blr Shift
g) Number of Fixed Lead Boilers
h) Switching Hysteresis                                              %
i) Low Fire Rate                                                     %
j) Number of On/Off Boilers
5) Circulation Pump Submenu Settings
a) Circulation Pump Maintenance Mode
b) Circulation Pump Overrun Time                              minutes
6) Frost Protection Submenu Settings
a) Frost Protection Mode                         1 stage
b) Minimum Water Temperature                                         &#176;C
c) Minimum Outside Air Temperature                                   &#176;C
7) Overrides Submenu Settings
a) Safety Interlock Circuit Operation
b) Remote Time-Clock Override
c) Remote Holiday Override
8) Security Code Submenu Settings
a) User’s Security Code
HAMWORTHY HEATING LTD               MILTON                 500001104/C
INSTALLER                         SITE ADDRESS
MILTON SERIAL NUMBER*
MILTON SOFTWARE VERSION*
INSERTION FLOW
TEMPERATURE SENSORS FITTED
BOILER MODEL CONTROLLED
* PRINTED ON REAR OF MILTON UNIT
HAMWORTHY HEATING LTD       MILTON                    500001104/C
Direct Dial Telephone and Fax Numbers
Fleets Corner, Poole, Dorset BH17 0HH England
Main switchboard tel: 01202 662500
• water heaters                                           Technical enquiries                      01202 662527/28                          01202 665111
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Spare parts                              01202 662525                             01202 665111
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Shady Lane, Great Barr, Birmingham B44 9ER
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Customer Services                            spares@hamworthy-heating.com
service@hamworthy-heating.com
technical@hamworthy-heating.com
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Hamworthy Heating Accredited Agents
North West England                                                                               Scotland
Gillies Modular Services                                                                         McDowall Modular Services
210-218 New Chester Road, Birkenhead, Merseyside L41 9BG                                         14-46 Lomond Street, Glasgow, Scotland G22 6JD
tel: 0151 666 1030 fax: 0151 647 8101                                                            tel: 0151 666 1030 fax: 0151 647 8101
Southern Ireland                                                                                 North East England
HEVAC Limited                                                                                    Allison Heating Products
Naas Road, Dublin 12, Ireland                                                                    17 Beech Road, South Shields, Tyne &amp; Wear NE33 2QH
tel: 00 3531 141 91919 fax: 00 3531 145 84806                                                    tel: 0191 455 7898 fax: 0191 455 7899
Unit 2, Antrim Line Business Park, Sentry Lane, Newtownabbey BT36 8XX
tel: 02890 849826 fax: 02890 847443
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