235216_condensing_boilers.pdf

CHICOPEE ARMORY REHABILITATION MMD PROJECT NO. 985101

CHICOPEE, MASSACHUSETTS ISSUED FOR BID - 05/20/11

10090 CONDENSING BOILERS 235216-1

SECTION 235216

CONDENSING BOILERS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 1 Specification Sections, apply to this Section.

B. The requirements of Section 230100, “Basic Mechanical Requirements” apply to work defined by this Section.

C. The requirements of Section 230500, “Basic Mechanical Materials and Methods” apply to work defined by the Section.

1.2 SUMMARY

A. This Section includes packaged, factory-fabricated and -assembled, gas-fired, water-tube or water-jacketed condensing boilers, trim, and accessories for generating hot water .

1.3 SUBMITTALS

A. Product Data: Include performance data, operating characteristics, furnished specialties, and accessories.

B. Shop Drawings: For boilers, boiler trim, and accessories. Include plans, elevations, sections, details, and attachments to other Work

1. Vibration Isolation Base Details: Detail fabrication including anchorages and attachments to structure and to supported equipment. Include auxiliary motor slides and rails, and base weights.

2. Wiring Diagrams: Detail power, signal, and control wiring.

C. Source quality-control test reports.

D. ASME Stamp Certification and Report: Submit "A," "S," or "PP" stamp certificate of authorization, as required by authorities having jurisdiction, and document hydrostatic testing of piping external to boiler.

E. Startup service reports.

F. Operation and Maintenance Data: For condensing boilers to include in emergency, operation, and maintenance manuals.

G. Warranties: Special warranties specified in this Section.

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1.4 QUALITY ASSURANCE

A. Product Options: Drawings indicate size, profiles, and dimensional requirements of condensing boilers and are based on the specific system indicated. Refer to Division 1 Section "Product

Requirements."

B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.

C. ASME Compliance: Fabricate and label condensing boilers to comply with ASME Boiler and

Pressure Vessel Code: Section VIII, Division 1.

D. ASHRAE/IESNA 90.1 Compliance: Boilers shall have minimum efficiency according to "Gas and Oil Fired Boilers - Minimum Efficiency Requirements."

E. DOE Compliance: Minimum efficiency shall comply with 10 CFR 430, Subpart B, Appendix N, "Uniform Test Method for Measuring the Energy Consumption of Furnaces and

Boilers."

F. UL Compliance: Test condensing boilers to comply with UL 795, "Commercial-Industrial Gas

Heating Equipment."

1.5 COORDINATION

A. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases. Concrete, reinforcement, and formwork requirements are specified in Division 3.

1.6 WARRANTY

A. Special Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace components of condensing boilers that fail in materials or workmanship within specified warranty period.

B. Warranty Period for Water-Jacketed Condensing Boilers:

1. Leakage and Materials: ten years from date of Substantial Completion.

2. Heat Exchanger Damaged by Thermal Stress and Corrosion: Nonprorated for <Insert number> years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

http://www.specagent.com/LookUp/Default.aspx?Section=235216

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B. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1.

a. Laars Heating Systems; a division of Waterpik Technologies, Inc.

b. Lochinvar Corporation.

c. Triangle tube

d. Viessmann Manufacturing Co. (US) Inc.

e.

2.2 WATER-TUBE CONDENSING BOILERS

A. Description: Factory-fabricated, -assembled, and -tested water-tube condensing boiler with heat exchanger sealed pressure-tight, built on a steel base; including insulated jacket; flue-gas vent;

combustion-air intake connections; water supply, return, and condensate drain connections; and controls. Water heating service only.

B. Water-Tube Boiler Components:

1. Heat Exchanger: Finned-copper primary and stainless-steel secondary heat exchangers.

2. Combustion Chamber: Stainless steel, sealed.

3. Burner: Natural gas, forced draft drawing from gas premixing valve.

4. Blower: Centrifugal fan to operate during each burner firing sequence and to prepurge and postpurge the combustion chamber.

5. Gas Train: Combination gas valve with manual shutoff and pressure regulator. Include

100 percent safety shutoff with electronic flame supervision.

6. Ignition: Silicone carbide hot-surface ignition that includes flame safety supervision and

100 percent main-valve shutoff.

7. Integral Circulator: Cast-iron body and stainless-steel impeller sized for minimum flow required in heat exchanger.

8. Casing:

a. Jacket: Sheet metal, with snap-in or interlocking closures.

b. Control Compartment Enclosures: NEMA 250, Type 1A.

c. Finish: Textured epoxy.

d. Insulation: Minimum 1-inch- thick fiberglass insulation surrounding the heat exchanger.

e. Combustion-Air Connections: Inlet and vent duct collars.

9. Mounting base to secure boiler to concrete base.

2.3 WATER-JACKETED CONDENSING BOILERS

A. Description: Factory-fabricated, -assembled, and -tested water-jacketed condensing boiler with heat exchanger sealed pressure-tight, built on a steel base; including insulated jacket; flue-gas http://www.specagent.com/LookUp/?uid=123456830696&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456830537&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123456830697&mf=04&src=wd

10090 CONDENSING BOILERS 235216-4

vent; water supply, return, and condensate drain connections; and controls. Water heating service only.

B. Fabricate base and attachment to pressure vessel with reinforcement strong enough to resist boiler movement during a seismic event when boiler base is anchored to building structure.

C. Water-Jacketed Boiler Components:

1. Heat Exchanger: Stainless-steel primary and secondary combustion chamber.

2. Pressure Vessel: Carbon steel with welded heads and tube connections where not in contact with combustion or flue gases.

3. Burner: Natural gas, forced draft; swing-open front and burner observation port.

4. Blower: Centrifugal fan, forced draft. Include prepurge and postpurge of the combustion chamber.

5. Gas Train: Combination gas valve with manual shutoff and pressure regulator. Include

100 percent safety shutoff with electronic flame supervision.

6. Ignition: Electric-spark ignition with 100 percent main-valve shutoff with electronic flame supervision.

7. Casing:

a. Jacket: Sheet metal, with snap-in or interlocking closures.

b. Control Compartment Enclosures: NEMA 250, Type 1A.

c. Finish: Powder-coated protective finish.

d. Insulation: Minimum 4-inch- thick fiberglass insulation surrounding the heat exchanger.

e. Combustion-Air Connections: Inlet and vent duct collars.

8. Mounting base to secure boiler to concrete base.

2.4 HOT-WATER BOILER TRIM

A. Include devices sized to comply with [ANSI B31.1, "Power Piping] [ANSI B31.9, "Building

Services Piping]."

B. Aquastat Controllers: Operating , firing rate, and high limit.

C. Safety Relief Valve: ASME rated. 30 psig .

D. Altitude and Temperature Gage: Minimum 3-1/2-inch- diameter, combination water-pressure and -temperature gage. Gages shall have operating-pressure and -temperature ranges so normal operating range is at approximately 50 percent of full range.

E. Boiler Air Vent: Automatic .

F. Drain Valve: Minimum NPS 3/4 hose-end gate valve.

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G. Circulation Pump: Non-overloading, horizontal, in-line pump with rubber-mounted, split-capacitor motor having thermal-overload protection and system-lubricated bearings; designed to operate at specified boiler pressures and temperatures.

2.5 BURNER OPERATING CONTROLS

A. Description: To maintain safe operating conditions, burner safety controls limit the operation of burner.

1. High Cutoff: Automatic reset stops burner if operating conditions rise above maximum boiler design temperature

2. Low-Water Cutoff Switch: Electronic probe shall prevent burner operation on low water. Cutoff switch shall be manual -reset type.

3. Blocked Inlet Safety Switch: Manual-reset pressure switch field mounted on boiler combustion-air inlet.

4. Alarm Bell: Factory mounted on control panel with silence switch; shall sound alarm for above conditions.

2.6 BOILER OPERATING CONTROLS

A. Boiler operating controls shall include the following devices and features:

1. Control Transformer: 115 V.

2. Sequence of Operation: Electric, factory-fabricated, and field-installed panel to control burner firing rate to reset supply-water temperature inversely with outside-air temperature. Retain subparagraph below with any of three sequences retained above.

a. Include automatic, alternating-firing sequence for multiple boilers.

2.7 VENTING KITS

A. Kit: ASTM A 959, Type 29-4C, stainless-steel, [horizontal] [vertical] vent terminal, [wall]

[roof] passage thimble, indoor wall plate, vent adapter, condensate trap, and sealant.

B. Combustion-Air Intake: Stainless-steel, [horizontal] [vertical] vent terminal with screen, inlet air coupling, and sealant.

C. Chimney and Type B Vent Adapter: Vent adapter and sealant.

2.8 SOURCE QUALITY CONTROL

A. Test and inspect factory-assembled boilers, before shipping, according to ASME Boiler and

Pressure Vessel Code: Section I, for high-pressure boilers and Section IV, for low-pressure boilers.

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PART 3 - EXECUTION

3.1 EXAMINATION

A. Before boiler installation, examine roughing-in for concrete equipment bases, anchor-bolt sizes and locations, and piping and electrical connections to verify actual locations, sizes, and other conditions affecting boiler performance, maintenance, and operations.

1. Final boiler locations indicated on Drawings are approximate. Determine exact locations before roughing-in for piping and electrical connections.

B. Examine mechanical spaces for suitable conditions where boilers will be installed. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 BOILER INSTALLATION

A. Install boilers level on concrete base. Concrete base is specified in Division 23 Section "Basic

Mechanical Materials and Methods," and concrete materials and installation requirements are specified in Division 3.

B. Install gas-fired boilers according to NFPA 54.

C. Assemble and install boiler trim.

D. Install electrical devices furnished with boiler but not specified to be factory mounted.

3.3 CONNECTIONS

A. Piping installation requirements are specified in other Division 23 Sections. Drawings indicate general arrangement of piping, fittings, and specialties.

B. Connect piping to boilers, except safety relief valve connections, with flexible connectors of materials suitable for service. Flexible connectors and their installation are specified in

Division 23 Section "Basic Mechanical Materials and Methods."

C. Connect gas piping full size to boiler gas-train inlet with union.

D. Connect hot-water piping to supply- and return-boiler tappings with shutoff valve and union or flange at each connection.

E. Install piping from safety relief valves to nearest floor drain.

F. Connect breeching full size to boiler outlet.[ Refer to Division 23 Section "Breechings, Chimneys, and Stacks" for venting materials.]

G. Install piping adjacent to boiler to allow service and maintenance.

H. Ground equipment according to Division 26 Section "Grounding and Bonding."

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I. Connect wiring according to Division 26 Section "Conductors and Cables."

J. Tighten electrical connectors and terminals according to manufacturer's published torque-tightening values. If manufacturer's torque values are not indicated, use those specified in

UL 486A and UL 486B.

3.4 STARTUP SERVICE

A. Engage a factory-authorized service representative to test, inspect, and adjust boiler components and equipment installation and to perform startup service.

B. Perform installation and startup checks according to manufacturer's written instructions.

C. Leak Test: Hydrostatic test. Repair leaks and retest until no leaks exist.

D. Operational Test: Start units to confirm proper motor rotation and unit operation. Adjust air-fuel ratio and combustion.

E. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

F. Adjust initial temperature set points.

G. Set field-adjustable switches and circuit-breaker trip ranges as indicated.

H. Occupancy Adjustments: When requested within 12 months of date of Substantial Completion, provide on-site assistance in adjusting system to suit actual occupied conditions. Provide up to two visits to site outside normal occupancy hours for this purpose, without additional cost.

I. Prepare written report that documents testing procedures and results.

3.5 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain condensing boilers. Refer to Division 1 Section "Closeout

Procedures ."

END OF SECTION 235216