**February 9, 1998**

**Addendum #4**

**Contract \# TW-0928**

**SPECIAL SPECIFICATION**

**SECTION 15462-S**

**[FUEL-FIRED WATER HEATERS]{.underline}**

[Page]{.underline}

PART 1 - GENERAL

1.01 DESCRIPTION

1.02 RELATED WORK

1.03 QUALITY ASSURANCE

1.04 REFERENCES

1.05 SUBMITTALS

1.06 DELIVERY, STORAGE, AND HANDLING

1.07 WARRANTY

PART 2 - PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

2.02 WATER HEATERS (BOILERS) GENERAL

2.03 COMMERCIAL, HORIZONTAL-GRID, FINNED-TUBE,\
GAS WATER HEATERS (WH-2)

2.04 COMMERCIAL, STORAGE, POWERED, GAS WATER\
HEATERS (BOILERS) (WH-1)

2.05 COMMERCIAL BOILERS (B1-B7)

2.06 STORAGE TANKS (T-3, -4)

PART 3 - EXECUTION

3.01 INSPECTION

3.02 CONCRETE BASES

3.03 WATER HEATER (BOILER) INSTALLATION

3.04 CONNECTIONS

3.05 COMMISSIONING

3.06 DEMONSTRATION

**SPECIAL SPECIFICATION**

**SECTION 15462-S**

**FUEL-FIRED WATER HEATERS**

PART 1 - GENERAL

1.01 [DESCRIPTION]{.underline}

A. This Section includes the following:

1.  Gas-fired water heaters with integral circulation pumps.

2.  Water heater accessories.

1.02 [RELATED WORK]{.underline}

A.  Section 01300-S

B.  Section 15010-S

C.  Section 15051-S

D.  Section 15401-S

1.03 [QUALITY ASSURANCE]{.underline}

A. Comply with provisions of the following:

3.  AGA standards and bear AGA certification label.

4.  NFPA 70, "National Electrical Code," for electrical components.

B. Product Options: Drawings indicate size, profiles, connections,
dimensional requirements, and characteristics of water heaters and
accessories and are based on specific types and models indicated. Other
manufacturers' water heaters and accessories with equal performance
characteristics may be considered based on Section 15010.

C. Equipment and system shall perform as specified and noted on drawings
for site elevation of 5500 feet elevation above sea level.

1.04 [REFERENCES]{.underline}

A.  AGA Standards

B.  NFPA 70

C.  NFPA 54

D.  UL 486A and B

1.05 [SUBMITTALS]{.underline}

A.  Make submittals according to this Section, Section 15010-S, and
    Section 1300-S.

B.  Submit product data including rated capacities of selected models,
    weights (shipping, installed, and operating), furnished specialties,
    and accessories. Indicate dimensions, finishes and coatings,
    required clearances, methods of assembly of components, and piping
    and wiring connections.

C.  Maintenance data for water heaters to include in operation and
    maintenance manuals specified in Division 1. Include startup
    instructions.

1.06 [DELIVERY, STORAGE, AND HANDLING]{.underline}

A.  See Section 15010-S.

B.  Store water heaters in a clean, dry location.

C.  Retain shipping protective covers and protective coatings during
    storage.

1.07 [WARRANTY]{.underline}

A.  General Warranty: The special warranty specified in this Article
    shall not deprive SNL of other rights SNL may have under other
    provisions of Contract Documents and shall be in addition to, and
    run concurrent with, other warranties made by Contractor under
    requirements of Contract Documents.

B.  Special Warranty: Submit a written warranty executed by manufacturer
    agreeing to repair or replace water heaters and accessories that
    fail in materials or workmanship within specified warranty period.
    Failures include, but are not limited to, tanks, coils, heat
    exchangers, and burners. This warranty is in addition to, and not a
    limitation of, other rights SNL may have against Contractor under
    Contract Documents.

C.  Warranty Period: Minimum 5 years after date of Substantial
    Completion.

PART 2 - PRODUCTS

2.01 [ACCEPTABLE MANUFACTURERS]{.underline}

A. Commercial, Horizontal-Grid, Finned-Tube, Gas Water Heaters:

5.  Lochinvar Corp.

6.  Precision Parts Corp.

7.  Raypak, Inc.

8.  Rheem Mfg. Co.; Rheem Water Heater Div.

9.  Rheem Mfg. Co.; Ruud Water Heater Div.

10. Smith: A.O. Smith Water Products Co.

11. Teledyne Laars.

12. AERCO

B. Commercial, Storage, Powered, Gas Water Heaters / Boilers (WH-1):

13. AERCO

14. Burnham

15. Precision Parts Corp.

16. PVI Industries, Inc.

17. Smith: A.O. Smith Water Products Co.

C. Commercial Boilers (B1 through B7)

18. AERCO

D. Compression Tanks:

19. Amtrol, Inc.

20. Armstrong Pumps, Inc.

21. Bell & Gossett

22. Expanflex, Inc.

23. Smith: A.O. Smith; Aqua-Air Div.

24. State Industries, Inc.

E. [Substitutions]{.underline}: only under provisions of Section 1600-S.

2.02 [WATER HEATERS (BOILERS) GENERAL]{.underline}

A. Specified manufacturer's standard components and features are
acceptable where specific product requirements are not indicated. Units
shall meet the minimum efficiency requirements of ASHRAE 90.1.

B. Temperature Control: Adjustable thermostat, except for units where
other arrangement is indicated or temperature is regulated by
flow-control fitting.

C. Safety Control: Automatic, high-temperature-limit cutoff device or
system on commercial units and where indicated. Include automatic
low-water cutoff device or system on commercial units where indicated.

D. Interior Finish: Materials that comply with requirements of
applicable NSF, AWWA, or FDA and EPA regulatory standards for tasteless
and odorless, potable-water-tank linings.

E. Tappings: Factory fabricated of materials compatible with tank.
Include tappings for piping connections, relief valves, pressure gage,
thermometer, blow down, vent, and controls as required and others as
indicated. Attach tappings to tank before testing and labeling. Include
tappings and connections as follows:

25. 2-Inch NPS (DN50) and Smaller: Threaded ends.

26. 2-1/2-Inch NPS (DN65) and Larger: Flanged ends.

F. Insulation: Fiberglass, polyurethane foam, or manufacturer's standard
that is suitable for operating temperature and required insulating
value. Include insulation material that surrounds entire tank except
connections and controls.

G. Jacket: Steel, with baked-on enamel finish, except where otherwise
specified.

H. Anode Rods: Factory installed, magnesium.

I. Circulation Pump: Integrally mounted on the water heater package.

2.03 [COMMERCIAL, HORIZONTAL-GRID, FINNED-TUBE, GAS WATER HEATERS
(WH-2)]{.underline}

A. Description: UL 795, packaged, horizontal-grid, finned-tube, gas
water heater complying with ANSI Z21.13 and for natural-gas fuel.
Include heater, storage tank, circulator, piping, and controls.

B. Water Heater: Enclosed, insulated unit with controls.

27. Construction: ASME labeled with 160-psig working-pressure rating.

28. Heat Exchanger: Copper, finned tube with bronze or glass-lined,
    cast-iron headers.

29. Burner: Manufacturer's standard, for use with grid, finned-tube
    water heaters and natural-gas fuel.

30. Automatic Ignition: Intermittent electronic ignition complying with
    ANSI Z21.20.

31. Gas Shutoff Valve: ANSI Z21.15, manually operated. Furnish for
    installation in piping.

32. Pressure Regulator: ANSI Z21.18, factory or field installed, for gas
    appliances. Provide regulators with pressure rating, capacity, and
    pressure differential required for water heater and gas supply.

33. Automatic Valve: ANSI Z21.21, appliance, automatic gas valve.

34. Automatic Damper: ANSI Z21.66, gas-fired-appliance,
    automatic-vent-damper device.

35. Draft Hood: Manufacturer's standard draft diverter; comply with
    ANSI Z21.12.

36. Pressure Relief Valve: ASME rated and stamped and complying with
    ASME PTC 25.3 and ANSI Z21.22. Include pressure setting less than
    water heater working-pressure rating. Furnish for installation in
    piping.

37. Combination Temperature and Pressure Relief Valve: ASME rated and
    stamped and complying with ASME PTC 25.3 and ANSI Z21.22. Include
    relieving capacity at least as great as heat input and pressure
    setting less than water heater working-pressure rating.

a\. Option: Separate temperature and pressure relief valves are
acceptable instead of combination relief valve.

12. Flow Switch.

13. Spark Ignition.

C. Storage Tank: Insulated; provide anode rods and relief valve.

38. Construction: ASME labeled, steel with 160-psig (1100-kPa)
    working-pressure rating.

39. Construction: ASME labeled, steel with 150-psig- (1035-kPa-) minimum
    working-pressure rating.

40. Combination Temperature and Pressure Relief Valve: ASME rated and
    stamped and complying with ASME PTC 25.3 and ANSI Z21.22. Include
    relieving capacity at least as great as heat input and pressure
    setting less than water heater working-pressure rating. Select
    relief valve with sensing element that extends into tank.

a\. Option: Separate temperature and pressure relief valves are
acceptable instead of combination relief valve.

41. Vacuum Relief Valve: Comply with ASME PTC 25.3. Furnish for
    installation in piping.

D. Mounting: Water heater, tank, and accessories factory mounted on
skids.

E. Circulator: UL 778, all bronze, inline, centrifugal, single-stage,
radially split case design, with mechanical seals; with 125-psig-
minimum working-pressure rating and 225 deg F continuous water
temperature.

F. Piping: Manufacturer's standard copper tubing.

G. Temperature Control: Adjustable, storage tank temperature-control
fitting and flow switch, interlocked with circulator and burner.

H. Safety Control: Automatic, high-temperature-limit cutoff; low-water
cut-off.

2.04 [COMMERCIAL, STORAGE, POWERED, GAS WATER HEATERS (BOILERS)
(WH‑1)]{.underline}

A. Description: UL 795, commercial, storage, powered, gas water heater;
with capacity more than 40 gal. and natural-gas input more than 75,000
Btuh.

B. Storage Tank Construction: ASME labeled, steel with 150-psig
working-pressure rating.

C. Burner: Powered gas burner for natural-gas fuel, and complying with
appropriate requirements of UL 795.

D. Gas Shutoff Valve: ANSI Z21.15, manually operated. Furnish for
installation in piping.

E. Pressure Regulator: ANSI Z21.18, factory or field installed, for gas
appliances. Provide regulators with pressure rating, capacity, and
pressure differential required for water heater and gas supply.

F. Automatic Ignition: ANSI Z21.20, automatic gas-ignition system and
components; spark ignition.

G. Automatic Valve: ANSI Z21.21, appliance, automatic gas valve.

H. Automatic Damper: ANSI Z21.66, gas-fired-appliance,
automatic-vent-damper device.

I. Combination Temperature and Pressure Relief Valve: ASME rated and
stamped and complying with ASME PTC 25.3 and ANSI Z21.22. Include
relieving capacity at least as great as heat input and pressure setting
less than water heater working-pressure rating. Select relief valve with
sensing element that extends into tank.

42. Option: Separate temperature and pressure relief valves are
    acceptable instead of combination relief valve.

J. Vacuum Relief Valve: Comply with ASME PTC 25.3. Furnish for
installation in piping.

43. Exception: Omit where water heater has integral vacuum relieving
    device.

K. Safety: Automatic hi-temp cut-off; low water cut-off.

2.05 [COMMERCIAL BOILERS (B1-B7)]{.underline}

A. Description: Modular High Efficiency Condensing Boiler Package
System. Each Boiler shall be UL Listed, FM/CSD-1 approved and ASME coded
and stamped. Each Boiler shall have an input of 2,000 mbh with a Sea
Level gross output of 1,720 to 1,8040 mbh [(]{.underline}dependent upon
water return temperature) when fired with natural gas. The Boiler
manufacturer must publish known part load value efficiencies; the
efficiency must increase as the firing rate decreases. The boiler
control panel shall be of a modular component design with the boiler
flame safeguard control, temperature controller and annunciator board
field replaceable. The Boiler shall have a ASME approved relief valve
setting less than the boiler working pressure.

B. Construction: Boiler modules shall be natural gas fired, condensing
fire tube design with a modulating forced draft power burner and
positive pressure vent discharge. The Boiler burner shall be capable of
a 15 to 1 turndown ratio of the firing rate without loss of combustion
efficiency or staging of gas valves. The boiler shall be capable of
handling return water temperatures down to 40º F without any concern of
thermal shock or fireside condensation. The boiler water pressure drop
shall not exceed 4.4 psig at 200 gpm. The boiler water connection shall
be 4-inch flanged 150 lb. ANSI rated. The boiler shall be designed so
that the thermal efficiency increases as the boiler firing rate
decreases. The heat exchanger shall be constructed of 316L stainless
steel with a one-pass combustion gas flow design. The 316L fire tube
wall thickness shall be no less than .094-inch wall thickness. The heat
exchanger shall be ASME stamped for a working pressure not less than 150
psig. The exhaust manifold shall be of corrosion resistant porcelainized
cast iron with a 8-inch dia. flue connection. The exhaust manifold shall
have a gravity drain for the elimination of condensation with a
collecting reservoir.

The flame monitoring system shall incorporate a UL recognized combustion
safeguard system utilizing spark ignition and a rectification type flame
sensor. An electro-hydraulic double seated safety shutoff valve with
proof of closure switch shall be an inherent part of the gas train. Each
boiler shall incorporate an electric type low water level cutoff with
test and manual reset and dual over-temperature protection with manual
reset in accordance with ASME section IV and CSD-1. Remote fault alarm
contacts, sensor failure detection and boiler status and failure
annunciator shall be standard equipment.

C. Mode of Operation (BMS) Boiler Management System: Boiler Manufacturer
shall supply as part of the boiler package a completely integrated
boiler management system to control all operation and energy input of
the multiple boiler heating plant. The Boiler Management System shall be
comprised of a microprocessor based control utilizing an RS-485
interface between the BMS and the boiler. The BMS controller shall have
the ability to operate up to 8 boilers. The controller shall have the
ability to vary the firing rate and energy input of each individual
boiler throughout its full modulating range to maximize the condensing
capability and the thermal output of the entire heating plant. The BMS
shall control the boiler outlet header temperature within + or - 2º F.
The controller shall be a PID type controller for accurate temperature
with excellent variable load response. The BMS controller shall provide
contact closure for auxiliary equipment such as system pumps and
combustion air inlet dampers.

Temperature control setpoints shall be fully field adjustable from 50º F
to 200º F in operation. The BMS controller shall have an LCD display for
monitoring of all sensors and interlocks. Non-volatile memory backup of
all control parameters shall be internally provided as standard. The
controller will automatically balance the sequence of operating time on
each module by a first-on first-off mode and provide for setback and
remote alarm contacts. Connection between central BMS system and the
individual modules shall be twisted pair low voltage wiring with the
boilers "daisy-chained" for ease of installation.

D. Installation: All aspects of installation shall be in strict
accordance with manufacturer's instructions. The vent systems shall be
designed by the contractor and must conform with all manufacturer's
recommendations and shall utilize UL listed stainless steel AL-29-4C
Positive Pressure. The vents must be sized in accordance with the boiler
manufacturer's recommendations. Boiler plant piping shall be field
constructed of materials as specified. Each boiler shall have individual
isolating shutoff valves for service and maintenance. Each boiler shall
require a minimum gas pressure of 7.0-inch W.C. and 2,000 scfh at full
load (rated capacity). Each boiler shall require an individual supply
gas regulator for proper gas regulation with a 2-inch NPT connection.

2.06 [STORAGE TANKS (T-3, -4)]{.underline}

A. Description: Steel, pressured-rated tanks constructed with welded
joints and factory-installed, butyl-rubber diaphragm. Include air
precharge to minimum system-operating pressure at tank.

B. Construction: ASME labeled with 150-psig (860-kPa) working-pressure
rating.

C. Interior Finish: Materials that comply with requirements of
applicable NSF, AWWA, or FDA and EPA regulatory standards for tasteless
and odorless, potable-water-tank linings.

D. Accessories: Include air-charging valve and pressure gage.

PART 3 - EXECUTION

3.01 [INSPECTION]{.underline}

A. Inspect areas and conditions, with Installer present, for compliance
with requirements for installation tolerances, housekeeping pads, and
other conditions affecting performance of the water heaters.

B. Inspect rough-in for hydronic, drainage piping, and electrical to
verify actual locations of connections prior to installation.

C. Do not proceed until unsatisfactory conditions have been corrected.

3.02 [CONCRETE BASES]{.underline}

A. Install concrete bases of dimensions indicated for water heaters and
accessories. Refer to Division 3 Section "Cast-in-Place Concrete" and
Division 15 Section "Basic Mechanical Materials and Methods."

3.03 [WATER HEATER (BOILER) INSTALLATION]{.underline}

A. Install concrete bases of dimensions indicated for water heaters and
accessories. Refer to Division 3 and Section 15051 for concrete.

B. Water Heater Installation

44. General: Install water heaters on concrete bases. Set and connect
    units according to manufacturer's written instructions. Install
    units plumb, level, and firmly anchored in locations indicated.
    Maintain manufacturer's recommended clearances. Install so controls
    and devices are accessible for service.

45. Anchor water heaters and storage tanks to substrate.

46. Install seismic restraints as indicated and recommended by
    manufacturer, and as required in Section 15201.

C. Install and connect gas water heaters according to NFPA 54.

47. Install gas pressure regulators on gas-burner inlets.

48. Install vent piping from gas-train pressure regulators and valves to
    outside of building where required. Terminate vent piping with
    brass-screened vent cap fitting. Do not combine vents except with
    approval of authorities having jurisdiction.

D. Install temperature and pressure relief valves in top portion of
storage water heater tanks and hot-water storage tanks. Use relief
valves with sensing elements that extend into tanks. Extend relief valve
outlet with water piping in continuous downward pitch and discharge to
closest floor drain.

E. Install pressure relief valves in hot-water-outlet piping for water
heaters without storage. Extend relief valve outlet with water piping in
continuous downward pitch and discharge to closest floor drain.

F. Install vacuum relief valves in cold-water-inlet piping.

G. Install vacuum relief valves in water heaters and hot-water storage
tanks that have copper lining.

H. Install water heater drain piping as indirect waste to spill into
open drains or over floor drains. Install hose-end drain valves at low
points in water piping for water heaters that do not have tank drains.
Refer to Section 15401 for drain valves.

I. Install thermometers on water heater inlet and outlet piping.
Thermometers are specified in Section 15135.

J. Install pressure gages on water heater piping when and as indicated.
Pressure gages are specified in Section 15135.

K. Install inlet and outlet piping manifolds for multiple water heaters.
Fabricate, modify, or arrange manifolds for balanced water flow through
water heaters. Include throttling valves in outlet manifolds and
thermometers in inlet and outlet manifolds.

L. Install piping adjacent to water heaters to allow service and
maintenance.

M. Arrange for field-applied insulation on equipment and piping not
furnished with factory-applied insulation.

3.04 [CONNECTIONS]{.underline}

A. Piping installation requirements are specified in other Division 15
Sections. Drawings indicate general arrangement of piping, fittings, and
specialties. The following are specific connection requirements:

49. Connect hot- and cold-water piping to units with shutoff valves and
    unions. Connect hot-water circulating piping to unit with shutoff
    valve, check valve, and union.

50. Connect gas piping to gas burner with drip leg, tee, shutoff valve,
    and union; minimum size same as inlet connection. Gas piping is
    specified in Section 15051-S.

51. Make connections with dielectric fittings where piping is made of
    dissimilar metals. Dielectric fittings are specified in Section
    15050-S.

B. Electrical Connections: Power wiring and disconnect switches are
specified in Division 16 Sections. Arrange wiring to allow unit
servicing.

C. Grounding: Ground equipment. Tighten electrical connectors and
terminals, including grounding connections, according to manufacturer's
published torque-tightening values. Where manufacturer's torque values
are not indicated, use those specified in UL 486A and UL 486B.

D. Gas, Water Heater Vent Connections: Connect to vent system. Include
draft hoods and diverters where required. Use vents same size as or
larger than water heater outlets, but not smaller than indicated, except
when smaller vent size has been calculated according to National Fuel
Gas Code. Comply with gas utility requirements for sizing. Gas vents are
specified in Division 15 Section "Breechings, Chimneys, and Stacks."

3.05 [COMMISSIONING]{.underline}

A. Provide labor, material, equipment, etc., required to facilitate the
commissioning process. Perform tests and verification procedures
required by the commissioning process when requested by SNL's
Commissioning Authority and directed by the General Contractor's Test
Engineer.

B. Startup Services: Engage a factory-authorized service representative
to provide startup service and to demonstrate and train SNL's
maintenance personnel as specified below.

52. Test and adjust operating and safety controls. Replace damaged and
    malfunctioning controls and equipment.

53. Train SNL's maintenance personnel on procedures and schedules
    related to startup and shutdown, troubleshooting, servicing, and
    preventive maintenance.

54. Review data in the operation and maintenance manuals. Refer to
    Division 1 Section "Contract Closeout."

55. Review data in the operation and maintenance manuals. Refer to
    Division 1 Section "Operation and Maintenance Data."

56. Schedule training with SDR at least 7 days' advance notice.

57. Ref. Section 01700 "Commissioning."

C. Perform the following final checks before startup:

58. Fill water heaters with water.

59. Charge compression tanks with air.

60. Check that piping system tests are complete.

61. Check for piping connection leaks.

62. Check for adequate combustion air.

63. Check for clear vents and devices.

64. Check for clear relief valve inlets, outlets, and drain piping.

65. Check operation of pumps and circulators.

66. Test operation of safety controls, relief valves, and devices.

D. Perform the following startup procedures:

67. Energize electric circuits.

68. Adjust operating controls.

69. Adjust hot-water-outlet temperature settings.

3.06 [DEMONSTRATION]{.underline}

A. Provide a factory-authorized service representative supervise
start-up of equipment, to demonstrate operation, and to provide a
minimum of 4 hours of owner training to train personnel.

END OF SECTION 15462