SECTION 15565

ELECTRIC BOILERS

PART 1 GENERAL

SECTION INCLUDES

Boiler.

Boiler controls.

Indoor-outdoor controller.

Water connections.

Electrical hook-up.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section 15973 - Pneumatic Control System: Installation and wiring of indoor-outdoor controller.

RELATED SECTIONS

Section 15510 - Hydronic Piping:	Piping, valves, and fittings.

Section 15515 - Hydronic Specialties: Relief valves.

Section 15973 - Pneumatic Control System.

Section 15975 - Direct Digital Control Systems.

Section 16180 - Equipment Wiring Systems: Electrical connection requirements and characteristics.

REFERENCES

ANSI/ASME SEC 4 - Boiler and Pressure Vessel Codes, Rules for Construction of Heating Boilers.

ANSI/ASME SEC 8D - Boiler and Pressure Vessel Codes, Rules for Construction of Pressure Vessels.

ANSI/NFPA 70 - National Electrical Code.

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

UL 834 - Heating, Water Supply, and Power Boilers -Electric.

SUBMITTALS

Submit under provisions of Section [01300] [_____].

Shop Drawings: Indicate assembly, weights, and heater configuration.

Product Data: Provide literature indicating general assembly components, controls, safety controls, wiring diagrams, and service connections.

Manufacturer's Installation Instructions: Indicate rigging, installation, and start-up procedures.

Field Reports: Submit under provisions of Section [01400] [_______].

Field Reports: Indicate start-up sequence, procedure followed, and test performed.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700] [_____].

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

QUALIFICATIONS

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

REGULATORY REQUIREMENTS

Conform to ANSI/ASME SEC 4 for construction of boiler.

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

DELIVERY, STORAGE, AND HANDLING

Delivery, store, protect and handle products to site under provisions of Section [01600] [_____].

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 warranty under provisions of Section [01700] [_____].

Warranty: Include coverage for boiler package.

PART 2 PRODUCTS

MANUFACTURERS

[_________________________] Product [________________].

[_________________________] Product [________________].

[_________________________] Product [________________].

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

MANUFACTURED UNITS

Electric [hot water] [steam] boiler completely packaged, factory assembled, ready for operation except for connections of piping and electrical connections.

FABRICATION

Assembly of welded steel vertical shell with supporting legs; forged steel flanges; inspection handhole; necessary fittings to accept gauges, safety and operating controls; threaded or flanged inlet and outlet connections; inlet diffuser; and lifting lugs, conforming to ANSI/ASME SEC 4 [and SEC 8D] requirements, and tested for maximum working pressure of 160 psig (1100 kPa).

Pipe flange type [incoloy] [copper] [stainless steel] sheathed immersion heating elements with maximum density of 75 watts per square inch (116 kW/sq meter), suitable for operation at 160 psig (110 kPa). Attach each element to tube sheet by mechanical assembly permitting single elements to be replaced without replacing entire tube bundle.

Enclose in [galvanized] steel jacket with factory applied baked enamel, insulated with [2 inch (50 mm)] [3 inch (80 mm)] thick fiberglass insulation.

Model: [____________] manufactured by [______________].

TRIM

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

Assemble with pressure gage, thermometer in brass separable well, automatic air vent,and drain valve.

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

Operating temperature controller [with outdoor reset] with remote bulb in brass separable well to control heating elements 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 relays.

High limit temperature controller with [automatic] [manual] reset to prevent boiler water temperature from exceeding safe system temperature.

CONTROLS

Provide pre-wired, factory assembled electric controls enclosed in NEMA 250 Type 1 cabinet, factory mounted integral with unit.

Controls shall include:

Unfused disconnect switch with door interlock.

Splitter arrangement and fused magnetic contactors for each element.

Fused control circuit transformer with control circuit on/off switch.

Proportioning step controller.

Remote bulb operating thermostat complete with brass separable well.

Remote bulb high limit thermostat complete with brass separable well.

Pilot lights for each step of control.

Terminals for connection of:

Peak load control system.

Pump motor starter auxiliary contact.

Flow switch.

Remote mounted three wire temperature controller.

PERFORMANCE

Provide [_____] boilers, each with gross output [_____] Btu/hr ([_____] kW), with [_____] elements each with [_____] kW rated capacity, controlled in [_____] steps.

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 pressures.

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; recharge 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.

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 [01400.] [_____] [Instruct operating personnel.]

Submit written report after start-up, including control settings.

SCHEDULE

Drawing_Code	B-1 B-2	B-3

Input

Working Pressure

Water Flow Rate

Entering Water Temperature

Leaving Water Temperature

Steam Production

Steam Pressure

Number of Steps

END OF SECTION