SECTION 15556

CAST IRON BOILERS

PART 1 GENERAL

SECTION INCLUDES

Boilers.

Controls and boiler trim.

Steam and condensate connections.

Hot water connections.

Fuel connection.

Collector, draft hood, and chimney connection.

Circulator.

Expansion tank.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [_____-__________:] Installation of indoor-outdoor controller.

RELATED SECTIONS

Section 15515 - Hydronic Specialties.

Section 15525 - Steam and Steam Condensate Specialties.

Section 15952 - Controls and Instrumentation

Section 16180 - Equipment Wiring Systems.

REFERENCES

AGA - Directory of Certified Appliances and Accessories.

ANSI/AGA Z21.13 - Gas-Fired Low-Pressure Steam and Hot Water Boilers.

ANSI/AGA Z223.1 - National Fuel Gas Code.

ANSI/ASME SEC4 - Boiler and Pressure Vessel Codes - Rules for Construction of Heating Boilers.

ANSI/ASME SEC8D - Boilers and Pressure Vessel Codes -Rules for Construction of Pressure Vessels.

ANSI/NFPA 70 - National Electrical Code.

ANSI/UL 726 - Oil-Fired Boiler Assemblies.

HI (Hydronics Institute) - Testing and Rating Standard for Cast Iron and Steel Heating Boilers.

SUBMITTALS

Submit product data under provisions of Section [01300.] [01340.]

Submit product data indicating general layout, dimensions, and size and location of connections.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

OPERATION AND MAINTENANCE DATA

Submit operation and maintenance data under provisions of Section [01700.] [01730.]

Include manufacturer's descriptive literature, operating instructions, cleaning procedures, replacement parts list, and maintenance and repair data.

QUALITY ASSURANCE

Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum [three] [_____] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to [applicable] [ANSI/NFPA 70] code for internal wiring of factory wired equipment.

Conform to [ANSI/ASME SEC4 and SEC 8D] [and] [ANSI/AGA Z21.13] [ANSI/UL 726] for boiler construction.

Units: [AGA certified.] [UL labelled.]

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Protect units before, during, and after installation from damage to casing by leaving factory shipping packaging in place until immediately prior to final acceptance.

WARRANTY

Provide [ten] [twenty] year [pro-rated] warranty under

provisions of Section [01700.] [01740.]

Warranty: Include coverage for cast iron boiler sections.

PART 2 PRODUCTS

MANUFACTURERS

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MANUFACTURED UNITS

[Hot water] [Steam] boilers suitable for [forced] [induced] [natural] draft insulated jacket, sectional cast iron heat exchanger, [gas] [oil] burning system, refractory, controls, and boiler trim.

For forced draft firing, provide water wall design consisting of water backed combustion area with water circulating around firebox. Refractory chamber or separate base not required.

FABRICATION

Assemble from cast iron sections with [30] [100] [15] psig ([200] [690] [100] kPa) ANSI/ASME Boilers and Pressure Vessels Code. Rating.

Provide clean-out and access doors, observation ports, and relief openings to flue passages.

Provide structural base of aluminized steel lined with high temperature mineral fiber insulating panels.

Provide glass fiber insulated steel jacket, finished with factory applied baked enamel.

STEAM BOILER TRIM

Pressure gage and ASME rated pressure relief valve.

Water column with cocks, gage glass set, and blowdown valves for glass and column.

Low water cut-off with manual reset installed in water column to prevent burner operations when boiler water drops below safe level.

Boiler condensate return pump control installed in water column to maintain water level by controlling pump operation.

Operating pressure controller for burner to maintain steam pressure setting.

High limit pressure controller for burner to prevent steam pressure from exceeding shaft system pressure.

HOT WATER BOILER TRIM

Combination water pressure and temperature gage, and ASME rated pressure relief valve.

Low water cut-off with manual reset to automatically prevent burner operation when boiler water falls below safe level.

Operating temperature controller [with outdoor reset] to maintain boiler water temperature.

Electronic operating temperature controller with full cover for wall mounting, ambient temperature range - 30 to 150 degrees F (-34 to 66 degrees C), adjustable reset ratio of outside air temperature change to discharge control point change 1:2 to 100:1, integral set point adjustment 80 to 230 degrees F (27 to 110 degrees C), electronic primary and outdoor sensors, for on-off switching of pilot duty single throw double pole relays.

High limit temperature controller for burner to prevent boiler water temperature from exceeding safe system temperature.

Boiler air vent.

FUEL BURNING SYSTEM

Burner Operation: [On-off] [Hi-Low] [modulating] with low fire position for ignition.

Oil Burner: High pressure atomizing type for No. 2 oil with combustion air blower, fuel pump, hinged flame inspection port, cadmium sulphide flame sensor, electrodes, ignition transformer, and oil nozzle.

Oil Burner Safety Controls: Energize burner motor and electric ignition, limit time for establishment of main flame, monitor flame continuously during burner operation and stop burner on flame failure with manual reset necessary, solenoid oil delay valve opens after burner motor energized and closes when de-energized.

Gas Burner: [Atmospheric] [Forced draft] type for [natural gas] [propane] adjustable combustion air supply, pressure regulator, gas valves, manual shut-off, intermittent spark or glow coil ignition, flame sensing device, and automatic 100 percent shut-off.

Gas Burner Safety Controls: Energize ignition, limit time for establishment of flame, prevent opening of gas valve until pilot flame is proven, stop gas flow on ignition failure, energize blower motor, and after air flow proven and slight delay, allow gas valve to open.

Combination Gas-Oil Burner: Burner for [natural gas] [propane] and No. 2 oil built as single unit, equipped with gas pressure regulator and oil-gas selector switch.

Collector and Draft Hood: Natural draft operation equipment as regularly supplied by manufacturer.

Controls: Pre-wired, factory assembled electronic controls in control cabinet with flame scanner or detector, programming control, relays, and switches. Provide pre-purge and post-purge ignition and shut-down of burner in event of ignition pilot and main flame failure with manual reset.

PERFORMANCE

Performance rating shall be in accordance with HI -Testing and Rating Standard for Cast Iron and Steel Heating Boilers.

Provide [___] boilers each with gross input [_____] Btu/hr ([_____] W), gross output [_____] Btu/hr ([_____] W) at [_____] psi working pressure and [_____] elevation.

CIRCULATOR

Type: Horizontal shaft, single stage, direct connected, with resiliently mounted motor for inline mounting, oil lubricated, for 125 psig (860 kPa) maximum working pressure.

Casing: Cast iron.

Impeller: Cadmium plated steel, keyed to shaft.

Bearings: Two, oil lubricated bronze sleeves.

Shaft: Alloy steel with copper sleeve, integral thrust collar.

Seal: Carbon rotating against a stationary ceramic seat, 225 degrees F (107 degrees C) maximum continuous operating temperature.

Drive: Flexible coupling.

Performance: [___] gal/min ([____] L/sec) flow capacity, [___] feet ([___kPa) head, [___] hp motor; Model [__________] manufactured by [___________________________________.]

DIAPHRAGM TYPE EXPANSION TANK

Construction: Welded steel, tested and stamped in accordance with ANSI/ASME SEC 8D; rated for working pressure of 125 psig (860 kPa), with flexible diaphragm sealed into tank, and steel legs or saddles.

Accessories: Pressure gage and air-charging fitting, tank drain; precharge to [12] [___] psig ([180] [___] kPa).

Size: [___] diameter, [___] overall length, [___] gallon ([___] L) capacity.

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Provide for connection to electrical service. Refer to Section 16180.

Provide connection of gas service in accordance with ANSI/AGA Z223.1.

Pipe relief valves to nearest floor drain.

Install circulator and diaphragm expansion tank on boiler.

MANUFACTURER'S FIELD SERVICES

Prepare and start systems under provisions of Section [01600.] [01650.] [Instruct operating personnel.]

Submit written report after start-up including control settings and performance chart of control system.

SCHEDULE

Drawing_Code	B-1	B-2	B-3

Location

Manufacturer

Model

Gross Input

Gross Output

Fuel

Working Pressure

Circulator

Flow Rate

Head Pressure

Motor

Expansion Tank Size

END OF SECTION