FOR INSTALLERS AND SERVICE TECHNICIANS ONLYGAS
FIREPLACESERVICEMANUAL
Sherwood Industries Ltd. Duplication of this document is prohibited. All rights reserved.
August 2003

C-10100

This is a service guide designed by SHERWOOD INDUSTRIES LTD.
We hope this manual will assist you to identify and correct operational concerns you mightexperience in all ENVIROGAS appliances.
This service guide is designed for TRAINED SERVICE TECHNICIANS AND INSTALLERS.
This guide is NOT to be used by the homeowner.
If after reading this guide and following our recommendations and the problem still excists,
please do-not hesitate to call our technical department.
Technical Division
SHERWOOD INDUSTRIES LTD.

TABLE OF CONTENTS

PAGE

1) PILOT WILL NOT STAY LIGHT
A) IGNITION SYSTEM………………………………………………………. 1B) IGNITION SYSTEM OK BUT PILOT WILL NOT LIGHT……………... 32) PILOT WILL NOT STAY LIT……………………………………………………… 73) MAIN BURNERS WILL NOT LIGHT…………………………………………….. 94) MAIN BURNERS WILL NOT STAY LIT…………………………………………. 11
5) SOOTING (ALL MODELS)…………………………………………………….…. 156) FLAME LIFTINGA) B-VENTED………………………………………………………………... 17B) DIRECT VENTED………………………………………………………... 18
7) BLOWER OPERATION ………………………………………………………….. 198) ORIFICE SIZING CHART………………………………………………………… 20
9) STEP BY STEP SERVICE INSTRUCTIONS…………………………………… 2110) GLOSSARY………………………………………………………………………. 23

SUGGESTED TOOLS LIST FOR SERVICINGGAS LEAK DETECTOR
MANOMETER
MULTIMETERCORDLESS DRILLWIRE STRIPPER/CRIMPER
WRENCHES, STANDARD AND METRICSCREWDRIVERS(TORX T20)
METAL SNIPSJUMPER WIRESNUMBERED DRILLS ((DMS))

Sherwood Industries Ltd.

ENVIRO

2003

1(PILOT WILL NOT LIGHTNO SPARK

A) IGNITION SYSTEM

Make sure that wires are notbroken, frayed and that allconnections are tight at boththe piezo ignitor andelectrode.

Replace with only
manufactures parts

Make sure that ceramic on theelectrode is not broken.
Carefully try to spin theporcelain.

IF IT DOES, replaceelectrode.

Make sure a 1/8” (3.175mm)
gap is maintained between
electrode and pilot hood.
SEE PAGE 2 FIGURE 1.

Replace electrode.

Retighten hex nut on backof the ignitor and makesure bracket is secure on
the valve.

Make sure the piezo ignitor is
not loose.

Make sure piezo ignitor is
working properly. Place ascrewdriver next to ignitor,and press ignitor. If it sparks,
OK.

Sherwood Industries Ltd.

IF IT FAILS, replace piezo
ignitor.

ENVIROPAGE 1

3.175mm

Sherwood Industries Ltd.

ENVIROPAGE 2

B) PIEZO IGNITOR OK BUT PILOT WILL STILL NOT LIGHT

Make sure all gas lines havebeen connected with noleaks.

Correct if necessary, testfor gas leaks in an
approved manner.

Make sure that the gas is“ON” (NG) Natural gas and(LP) Propane tanks are full.

Correct if necessary.

Make sure the applianceservice valve is in the “ON”
position.
SEE PAGE 4 FIGURE 3.

Turn service valve to the“ON” position.

Test to make sure there is no
air in the gas line.
SEE PAGE 4 FIGURE 3.

Use a match to see if air orgas comes from the pilot
assembly.

Make sure that the valve has
not reset itself.
(All valves have an interlock
safety device.)

Wait 60 seconds for thesafety to reset itself.

Make sure pilot injector is
not clogged.

Sherwood Industries Ltd.

Clean the pilot injector if
necessary.

ENVIROPAGE 3

EXPLODED VIEW S.I.T PILOT ASSEMBLY

To remove pilot injector:
Remove the two screws that holdthe pilot assembly to the burnercontrol assembly.
Lift the assembly straight up being
careful not to damage any
components.
Using a 10 mm wrench undo thesecuring nut on pilot tubing and pulltubing down to access injector.
Being careful not to damage theceramic spark electrode.
Replace the injector and reinstall
the pilot tubing, always to perform agas leak test before lighting thepilot assembly.

PILOT HEAD

THERMOPILE
PILOT INJECTORSPARK ELECTRODE
THERMOCOUPLE

The number on the side of theinjector will determine the size. This
number is in millimeters.

Sherwood Industries Ltd.

ENVIROPAGE 4

3.5” wc BELOW 03.5” wc ABOVE 0
INLET GAS PRESSURE
7” wc (NG) NATURALGASNO PRESSURE

1.75” wc BELOW 01.75” wc ABOVE 0
OUTLET GAS PRESSURE
3.5 “ wc (NG) NATURALGAS

SUPPLY PRESSURES
NATURAL GAS
50% TURN DOWN
33% TURN DOWNMAX SUPPLY PRESSUREMIN SUPPLY PRESSURE
MAX SUPPLY PRESSUREMIN SUPPLY PRESSURE

Sherwood Industries Ltd.

7” wc
5” wc
7” wc
4.5” wc

ENVIROPROPANE GAS
12” wc11.5” wc
13” wc10.5” wc

PAGE 5

190 mv DC

CHECKING THERMOPILE FOR PROPER VOLTAGE
Place the leads of the multimeter on the TP/TH and TP
terminals on the valve as shown.
With the switch in the “ON” position, the readings should
be approximately 190mV DC (this an average reading) or
greater for proper Thermopile operation.
The main burners may not come ON if the readings areless than 145mV DC.
If a thermostat has been installed. Place the
ON/OFF/THERMO switch in the THERMO position; place
the leads of the multimeter on the TP/TH and TH terminals
on the valve or on the connections at the thermostat.
MV reading should be higher than 190 mV DC for proper
valve operation.
THESE READINGS SHOULD BE CONSTANT WITH NO
FLUCTUATION.

CHECKING
THERMOCOUPLE FOR
PROPER VOLTAGE
Place one lead from themultimeter on thethermocouple lead, and theother lead from themultimeter on the back of
the valve where the blue
wire is soldered to the valve.
These readings should be
between 8 and 16mV DC.
If these readings are 2 to 6
mV DC, the Thermocouple
should be replaced

2 to 6mv DC

THERMOCOUPLE

When using a S.I.T EUROSIT 630 SERIES gas valve, place
one lead from the multimeter on the thermocouple lead andthe other lead into the adapter located on the back of thevalve, there are two blue wire a inserted into this adapter.
Sherwood Industries Ltd.

ENVIROPAGE 6

2) PILOT WILL NOT STAY
LIT

Use a manometer on the inlet
side of the valve to measuregas pressure. Adjust inlet
pressure or contact your gas
supplier.

Make sure the gas pressure iscorrect for type of fuel you areusing.
SEE PAGE 5 FIGURE 7.

Thermocouple should be thesame height as the pilot hood.
Make sure pilot flame isengulfing the top 3/8” of thethermocouple.
SEE PAGE 2 FIGURE 2.

Adjust pilot as required.

Check for clogged pilot
injector.
Make sure thermocouple
connections on valve aretight.
DO NOT OVER TIGHTEN!!!

Thermocouple connections
should be hand tight plu1/4
turn.

Make sure the thermocouple
line has no kinks and is clean
on both ends. Also check thethermocouple for damage.

Clean thermocouple ends
with Emery cloth or anabrasive sponge.
DO NOT USE A METAL FILE.
Replace if damaged.

Make sure the thermocouple
has proper voltage (DCVOLTAGE).

Using a multimeter, insert
adapter between valve andthermocouple, if the readings
are less than 2 TO 6 mV DC,
replace thermocouple.
SEE PAGE 6 FIGURE 8.

Sherwood Industries Ltd.

ENVIROPAGE 7

S.I.T EUROSIT MODULATING 630 SERIES

Sherwood Industries Ltd.

ENVIROPAGE 83) MAIN BURNERS WILLNOT LIGHT

Make sure gas valve knob isin the “ON” position.
SEE PAGE 8 FIGURE 6.

Correct if necessary.
Turn valve to the “ON”
position.

Make sure that the “ON-OFF
THERMO” switch is in the“ON” position.

Turn switch “ON”.

Make sure that thethermostat is “NOT” in thelowest position.

Turn thermostat “UP”.

Replace damaged wires asnecessary. Gently squeeze
connectors with a pair ofpliers and reinstall wires.

Make sure that all control
wires are not damaged,
broken or frayed and that all
wire connections are tight.

Make sure that thethermopile connections aretight on the valve.

Tighten the two screws on
valve if necessary“TP/TP-TH” terminals on
valve.

Make sure millivolt readings
from thermopile are withinmanufactures
specifications. MAKE SUREMILLIVOLT READINGS ARECONSTANT.
SEE PAGE 6 FIGURE 8.

Place leads of multimeteron the “TP/TH-TP”
terminals on gas valve. If
the readings are less than
145mV DC, replace
thermopile

Continued on next page.

Sherwood Industries Ltd.

ENVIROPAGE 9

MAIN BURNERS WILL NOT LIGHT CON’T.

Bypass spill switch with ajumper wire as shown. If theunit starts, replace the spill
switch. DO NOT LEAVE BYPASSED IN.

Check spill switch operationon B-vented models only
SEE PAGE 10 FIGURE 9.

Check the “ON-OFF” switch
and thermostat for proper
operation.

Use a jumper wire. If the unit
starts, replace switch if
necessary.

Make sure that the mainburner orifices are notclogged or damaged.

Remove the top tray.
Remove orifice and clean.
Replace if damaged.

Sherwood Industries Ltd.

ENVIROPAGE 10

4) MAIN BURNERS WILLNOT STAY LIT

Adjust pilot if necessary.
Make sure pilot flame engulfs
the thermopile and does
“NOT” have a yellow
luminous flame.
SEE PAGE 4 FIGURE 4.

Check outlet gas pressure.
Check for clogged pilot
injector or blocked air inlet.

Using a multimeter checkthermopile. If not constantreplace thermopile.

Make sure millivolt readings
from thermopile are constant.

Make sure all wiring is notdamaged or broken and allconnections are tight.

Correct if necessary.

By pas spill switch.
If unit starts, replace spill
switch.

B-VENTED MODELS
Check spill switch.

Check to make sure the vent isdrafting properly.

Check for spillage.
SEE PAGE 12.

Make sure all venting meets
manufactures specifications
as well as local gas andbuilding code requirements.

Correct if necessary.

Check chimney for blockage
or restriction.

Sherwood Industries Ltd.

Correct if necessary.

ENVIROPAGE 11

Sherwood Industries Ltd.

ENVIROPAGE 12SAMPLE DIRECT VENT CHIMNEY INSTALLATIONS
ALL MODELS

Sherwood Industries Ltd.

ENVIROPAGE 13

SAMPLE B-VENTED CHIMNEY INSTALLATIONS
ALL MODELS

INSERT MODELSMUST BE FULLY
LINED AND SEALED

Sherwood Industries Ltd.

ENVIROPAGE 14

5) SOOTING

Make sure log placement isin the correct location.

Correct to manufactures
specifications.

Correct if necessary.
Outside air supply may berequired on B-vented
models.

Make sure there is sufficient
air supply.

Check air shutter on theventuri tube for proper
primary air adjustment.
SEE PAGE 16.

Increase primary air.
Open air shutter.

Make sure orifice matches
that on the rating plate.

Correct if necessary.

Make sure outlet (manifold)pressure is correct.

Use a manometer to checkthe gas pressure.
SEE PAGE 5 FIGURE 7.

Make sure the unit has beenderated for high altitude
applications.
(if required)

Correct if necessary.

Check to make sure that thevent is drafting properly.

Sherwood Industries Ltd.

Correct if necessary.

ENVIROPAGE 15

IF THE AIR SHUTTER ISOPENED WIDER, THE
FLAME COULD APPEARALMOST ALL BLUE
WITH FLAME LIFTING
BEING THE END RESULTIF OPENED TOO MUCH

WITH THE AIR SHUTTERSET PROPERLY, THE
FLAME WILL SIT ON THE
BURNER PORT AND THE
FLAME PATTERN WILLSTART AT THE BOTTOM
WITH A BLUE FLAME
THEN TURNING TO A
WHITE ALMOSTYELLOW FLAME WITH A
SLIGHT ORANGE EDGE

AS THE AIR SHUTTER
IS CLOSED, THE
FLAME COULD
APPEAR TALLER WITH
A VERY LAZY BLACK
ORANGE TIPPEDFLAME PRODUCINGCARBON (SOOT)

Sherwood Industries Ltd.

ENVIROPAGE 16

6) FLAME LIFTINGA) B-VENTED MODELS

Adjust air shutter, byclosing shutter.
DO NOT GO TOO FAR OR
THE UNIT WILL SOOT.

Check air shutter on theburner tube (venturi).

Make sure there are noleaks in the venting system.

Seal venting if necessary.

Improper venting
configuration.

Correct if necessary.

Make sure that manifold(outlet).
Pressure is correct.

Use a manometer to checkgas pressure.
SEE PAGE 5 FIGURE 7.

Sherwood Industries Ltd.

ENVIROPAGE 17B) DIRECT VENT MODELS

Check air shutter on theburner tube (venturi).

Adjust air shutter.
Close until flame sits onto
the burner ports.

Seal exhaust tube with hightemperature silicone.
Also make sure that
combustion air pipe issealed.

Make sure there are no leaksin the venting system.

Make sure the unit is notrecirculating flue products.

Check flue for blockage orhigh wind situations.

Make sure the gas pressure
is correct for fuel being used.

Use a manometer to checkgas outlet (manifold)pressure.
SEE PAGE 5 FIGURE 7.

Make sure the orifice size is
the same as the rating plate.

Correct if necessary.

Add a vent restrictor ring.
SEE OWNERS MANUAL.

Sherwood Industries Ltd.

Only if necessary.

ENVIROPAGE 18

7) BLOWER DIAGNOSISALL MODELS

Check to make sure that the fan is plugged in.

Make sure the fan control knob is in the “ON”
position.
Make sure the two wires are connected to the
fan temperature sensor.
Make sure that the two wires are connected tothe blower.
Make sure there are no broken, damaged orfrayed wires.
Make sure that the fan sensor is secure and that
it is not damaged.
If the blower does not work,
replace the blower.

Using a supply cord connectedto the blower, plug the blower
directly into wall outlet.

If the blower works, replace
the fan temperature sensor

By pass the fan temperature
sensor with a jumper wire.

By pass the fan controller witha jumper wire.

If the blower does not work,
replace the fan controller.

MAKE SURE THAT THE FAN SENSOR IS AT OPERATINGTEMPERATURE BEFORE TESTING THE FAN CONTROLLER.

Sherwood Industries Ltd.

ENVIROPAGE 19

ORIFICE SIZINGCHARTDRILL#
70
69
68
1/32
67
66
65
64
63
62
61
60
59
58
57
56
3/64
55
54
53
1/16
52
51
50
49
48
5/64
47
46
45
44
43
42
3/32
41
40
39
38
37
36
7/64
35
34

SIZE
.0280
.0292
.0310
.0313
.0320
.0330
.0350
.0360
.0370
.0380
.0390
.0400
.0410
.0420
.0430
.0465
.0469
.0520
.0550
.0595
.0625
.0635
.0670
.0700
.0730
.0760
.0781
.0785
.0810
.0820
.0860
.0890
.0935
.0938
.0960
.0980
.0995
.1015
.1040
.1065
.1094
.1100
.1110

SHERWOOD IDUSTRIES LTD.

NATURAL GAS
3.5”
3.8”
1991
2074
2165
2256
2440
2542
2487
2591
2600
2709
2765
2881
3110
3240
3291
3429
3476
3622
3666
3820
3862
4024
4062
4232
4268
4447
4479
4667
4695
4892
5490
5720
5585
5819
6865
7153
7680
8002
8989
9366
9918
10334
10238
10667
11398
11876
12441
12962
13530
14097
14665
15279
15487
16136
15646
16302
16658
17356
17072
17787
18778
19565
20111
20954
22197
23127
22339
23275
23399
24379
24384
25406
25137
26190
26157
27253
27462
28613
28798
30005
30388
31661
30722
32009
31283
32594
ENVIROPROPANE GAS
10”
11”
5221
5476
5678
5956
6400
6713
6524
6843
6820
7153
7253
7607
8158
8557
8631
9053
9117
9563
9617
10087
10130
10625
10655
11176
11195
11742
11748
12322
12314
12916
14400
15104
14649
15365
18008
18888
20146
21131
23578
24730
26014
27286
26854
28167
29896
31357
32633
34228
35490
37225
38467
40347
40622
42608
41039
43045
43695
45831
44780
46969
49256
51663
52753
55331
58221
61067
58596
61460
61377
64377
63961
67087
65933
69156
68610
71964
72032
75553
75537
79229
79707
83603
80582
84522
82055
86066
PAGE 20

STEP BY STEP SERVICE INSTRUCTIONS
These appliances do require to be serviced. Our best recommendation is that the appliance beserviced (1) once a year, maybe just before the heating season starts.
Annual service should and inspection should include:
⇒
⇒
⇒
⇒
⇒
⇒
⇒

⇒
⇒
⇒
⇒

⇒

Open the two side panels or remove the face frame from the appliance. Vacuum all areas
around the convection blower making sure there are no obstructions near the convection
blower or in the impeller fan blades.
EG-95 inserts and freestanding fireplaces convection blowers do require lubrication. Uselightweight oil 20 SAE, 3 in 1 oil, or sewing machine oil (2 drops only). Too much oil willcontract dust and dirt, which could cause premature breakdown of the convection blower.
Check all wiring for loose connections and damage to any of the wires.
Check to make sure that the flue is connected and that the flue is not plugged and that it isfree from obstructions.
Also check to make sure that the fresh air, if installed, is not clogged and that it is free from
obstructions.
Open the glass door by undoing the ½” bolt on the right hand side of the appliance, swing thedoor all the way open and gently lift the door of the two pins on the left hand side of theappliance.
Carefully remove the log set from the firebox. NOTE: The edges of the logs become brittle
with heat over time so they could be damaged when removing the logs. Remove the glowing
ember material making sure not to drop any of the ember material, which could drop into air
passages or drop on the pilot assembly.
Inspect the pilot assembly for build up on the Thermocouple and Thermopile; also make surethat the pilot assembly has not been damaged.
Vacuum all areas inside the firebox in and around the burner tray, control panel andsurrounding areas.
Carefully replace the logs and glowing embers into the firebox making sure that the log andember material are in the correct location (refer to the owner and operators manual).
Inspect the door gaskets to make sure that it is not cracked broken or frayed. Place the door
assembly back on the two pins on the left side of the appliance, close the door and tighten the½” bolt on the right hand side, make sure that the gasket is fully sealed (pay special
attention to the corners of the bay window). Visually check for a small gap, if there is agap, open the door and fluff the gasket up a little, reinstall the glass and re inspect the gasket
to make sure it has sealed.
Relight the appliance, before you turn the gas control knob to the “ON” position, do a millivolt
reading from the thermopile. Turn the gas control knob to the “ON” position, before the mainburners are turned “ON” do another millivolt reading at the thermopile to make sure there is nochange.

Sherwood Industries Ltd.

ENVIROPAGE 21⇒⇒⇒⇒Turn the switch to the “ON” position; check the millivolt readings at the thermopile make surethat the readings meet manufacters specifications. Turn the unit “OFF”.
Install a manometer on the inlet side of the gas valve marked (E), re light the appliance makesure that the inlet pressure meets the manufactures specifications.
Shut the unit “OFF” once again and do an outlet (manifold) pressure test. Relight theappliance and make sure the outlet (manifold) pressure is within manufactures specifications.
FINALLY, check to make sure that the unit is venting properly by placing a match in the
dilution air outlet or in the draft tube on insert models. If the match is blown out then there issome sort of restriction. Correct if necessary.

CLEANING THE APPLIANCE⇒

Only use a very soft cloth an a non abrasive cleaner, DO NOT use any alcohol’s, mineralspirits, gasoline’s or abrasive cleaners.
When cleaning the glass there could be some stubborn material left on the glass, DO NOT
use a scraper or abrasive cleaning agents on the glass because this could scratch the glass
which in turn will make he glass weak at the point of the scratch. There is a glass cleaner thatis specially designed for gas fireplaces, which can be purchased at your local dealer.

Sherwood Industries Ltd.

ENVIROPAGE 2210) GLOSSARY

B-VENTED SYSTEM
A venting system using only approved double wall pipe and approved B-vent components. Thissystem also uses room air for proper venting action through the dilution air inlet mounted on theback of the unit.

CONTINUITY TEST
By using a multimeter set on OHMS, is determined if the circuit is complete, or continuous (nobreak in the circuit).

DIRECT VENT SYSTEM
A venting system sealed from the structure for both the exhaust gases and fresh air supply.

ELECTRODE (ignition)
Receives spark from the piezo ignitor to light the pilot.

IGNITOR (piezo)
A component used to create an electrical spark to the electrode to light the pilot.

IMPINGEMENT
When flame comes in contact with physical components. Impingement can cause incomplete
combustion resulting in carbon monoxide production as well as soot.

MANOMETER
Instrument used to measure gas pressure.

MILLIVOLT
One –one thousands (1/1000) of a volt (.001mV DC)

MULTIMETER
Instrument used to measure Volts. Amps, Ohms, (Volts DC, AC)

ORIFICE
A component that controls gas flow through the burners.

PILOT INJECTOR
A component that directs gas flow through the pilot assembly.

PRESSURE REGULATOR
A device used to maintain downstream gas pressure.

RATING PLATE
A plate in the appliance which shows all certifications and what type of fuel and what theappliance is rated for (example: BTU’s, gas type, serial#, etc.).

SOOTING
Carbon build up produced by incomplete combustion of the fuel being used.

SPILLAGE
When flue products do not properly exit the structure through the venting system.

SPILL SWITCH
A temperature sensitive switch designed to shut the appliance off in the case of improper
venting action.

THERMOCOUPLE
A device used to generate power with heat from the pilot, up to 25mV DC.

THERMOPILE
A device used to generate power with heat from the pilot, up to 750mV DC.

VENTURI
Where gas and air are mixed before entering the burner tube.
Sherwood Industries Ltd.

ENVIROPAGE 23