SECTION 15558

FINNED WATER TUBE BOILERS

PART 1 GENERAL

SECTION INCLUDES

Boilers.

Controls and boiler trim.

Hot water connections.

Fuel connection.

Collector, draft hood, and chimney connection.

Collector, induced draft fan, and chimney connection.

Circulator.

Expansion tank.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

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

RELATED SECTIONS

Section 15517 - Hot Water 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 - Boiler and Pressure Vessel Codes, Rules for Construction of Pressure Vessels.

ANSI/NFPA 70 - National Electrical Code.

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

NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

SUBMITTALS

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

Submit product data indicating general assembly, components, controls, safety controls, and wiring diagrams.

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 [ANSI/ASME SEC4] [and] [ANSI/AGA Z21.13 Code] for construction of boiler.

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

Units: AGA certified.

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 [five] [_____] year [manufacturer's] warranty under provisions of Section [01700.] [01740.]

Warranty: Include coverage for heat exchanger.

PART 2 PRODUCTS

MANUFACTURERS

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

[___________________________________] Model [__________.]

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

MANUFACTURED UNITS

Hot water, natural draft boiler with horizontal grid, finned tube heat exchanger, gas burning system, refractory combustion chamber, controls, and boiler trim.

FABRICATION

Assembly of finned copper [or steel] tube heat exchanger within combustion chamber conforming to ANSI/ASME SEC4 [and SEC8D] requirements, and tested for maximum working pressure of 160 psi (1100 kPa).

Line combustion chamber with interlocking refractory insulating panels of vermiculite, high temperature cements, asbestos fiber and refractory clay.

Fabricate exchanger of finned copper tubing with baffles and sealed into bronze or cast iron headers with silicone O-ring gaskets [or finned steel tubing with baffles and welded into steel headers.]

Finish with galvanized steel jacket with factory applied baked enamel, insulated with foil faced fiberglass insulation.

Heat exchanger shall be cleanable from either side, and from one side without removal of external piping.

FUEL BURNING SYSTEM

[Induced Draft] [Atmospheric] Gas Burner: Stainless steel burners for [on-off] [hi-low] [modulating] firing and [natural gas] [propane] with adjustable combustion air supply, gas pressure regulator, diaphragm gas valves, manual shut-off, [intermittent spark or glow coil ignition] [standing pilot], thermister flame sensing device, and automatic 100 percent safety gas shut-off.

Provide gas burner safety controls to 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.

Provide flue gas collector, built-in [two speed] induced draft fan, with draft gage and draft providing switches.

****** [OR] ******

Provide flue gas collector and draft hood.

Provide wire brush for cleaning fire side surfaces.

TRIM

ASME rated pressure relief valve set at [45] [60] [___] psi ([310] [410] [___] kPa).

Low water cut-off with manual reset and inlet flow switch to automatically prevent burner operation when water falls below safe level or on low flow through boiler.

Operating temperature controller [with outdoor reset] to control burner operation to maintain supply 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 ration 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 relays.

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

CONTROLS

Provide pre-wired, factory assembled electric controls enclosed in cabinet to NEMA 250 requirements. Controls shall include pilot safety and thermocouple transformer, 24-volt gas valve, manual main and pilot valves, and junction box.

PERFORMANCE

Provide [___] boilers each with gross input [___] Btu/hr ([___] W) gross output [___] Btu/hr ([___] W), at sea level.

CIRCULATOR

Type: Horizontal shaft, single stage, direct connected, with resiliently mounted motor for in-line 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 Section 8D of ANSI/ASME Boiler and Pressure Vessels Code; 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 ([80] [___] 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 Z233.1.

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.

SCHEDULE

Drawing_Code	B-1	B-2	B-3

Location

Manufacturer

Model

Gross Input

Gross Output

Circulator

Flow Rate

Head Pressure

Motor

Expansion Tank Size

END OF SECTION