SECTION 16864

ELECTRIC SPACE HEATING UNITS

PART 1 GENERAL

SECTION INCLUDES

Electric unit heaters.

Electric cabinet heaters.

Electric baseboard heaters.

Thermostats and accessories.

REFERENCES

NEMA DC 3 - Low Voltage Room Thermostats.

NEMA DC 15 - Line Voltage Room Thermostats.

SUBMITTALS

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

Product data: Provide unit size, finish, and performance data.

Submit manufacturer's installation instructions.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700.] [01730.]

Operation Data: Include instructions for safe operating procedures.

Maintenance Data: Include instructions for replacement parts and troubleshooting diagnostics.

Include recommended cleaning methods, cleaning materials, and waxes for interior parts and exterior finishes.

FIELD MEASUREMENTS

Verify that field measurements are as [shown on Drawings.] [instructed by manufacturer.]

PART 2 PRODUCTS

MANUFACTURERS

[______________________________] Product [__________.]

[______________________________] Product [__________.]

[______________________________] Product [__________.]

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

ELECTRIC HORIZONTAL DISCHARGE UNIT HEATERS

Description: Electric unit heater for suspended mounting, with fan forced air distribution over electric resistance heating coils and horizontal discharge.

Input Voltage: [120] [208] [240] [277] [480] [_____] volts, 60 Hz, [single] [three] phase.

Output Rating: [_____] kW, [__________] cu ft/min.

Heating Element: [Enclosed copper tube, aluminum finned element of coiled nickel-chrome resistance wire centered in tubes and embedded in refractory material.] [Exposed helical coil of nickel-chrome resistance wire with refractory ceramic support bushings.] [_______________.]

Input Fuses: Provide integral fuses for units rated more than 48 amperes full load.

Provide line voltage disconnect switch for each input circuit.

Fabrication: Fabricate cabinet of [heavy welded steel.] [____________________.]

Provide [hinged and latched] ]captive-screw held] panel for electrical connection and control compartment.

Provide internal shroud around heating elements to assure uniform air flow and delivery temperature across heater face.

Provide suitable fan blade protection using wire guard.

Cabinet Finish: [Use corrosion-resisting primer and finish with [beige] [_____] baked enamel.] [______________________________.]

Contactor: Provide contactor control for unit.

Thermostat: Provide integral [line voltage] [low voltage] thermostat to [directly control heater element.] [control contactor.]

Provide low voltage control transformer.

Operating Stages: [One.] [Two.] [_____.]

Provide terminal blocks for power and control wiring

connections.

Louver: Provide discharge louver with individually adjustable blades.

ELECTRIC DOWNFLOW DISCHARGE UNIT HEATERS

Description: Electric unit heater for suspended mounting, with fan forced air distribution over electric resistance heating coils and vertical discharge.

Input Voltage: [120] [208] [240] [277] [480] [_____] volts, 60 Hz, [single] [three] phase.

Output Rating: [_____] kW, [__________] cu ft/min.

Heating Element: [Enclosed copper tube, aluminum finned element of coiled nickel-chrome resistance wire centered in tubes and embedded in refractory material.] [Exposed helical coil of nickel-chrome resistance wire with refractory ceramic support bushings.] [______________________________.]

Input Fuses: Provide integral fuses for units rated more than 48 amperes full load.

Provide line voltage disconnect switch for each input circuit.

Fabrication: Fabricate cabinet of [heavy welded steel.] [____________________.]

Provide [hinged and latched] ]captive-screw held] panel for electrical connection and control compartment.

Cabinet Finish: [Use corrosion-resisting primer and finish with [beige] [_____] baked enamel.] [______________________________.]

Contactor: Provide contactor control for unit.

Thermostat: Provide integral [line voltage] [low voltage] thermostat to [directly control heater element.] [control contactor.]

Provide low voltage control transformer.

Operating Stages: [One.] [Two.] [_____.]

Provide terminal blocks for power and control wiring connections.

Diffuser: [None.] [Vane type, adjustable from 0 degrees to 45 degrees (0 to 1.5707 radians).] [Louver type, adjustable from 0 degrees to 45 degrees (0 to 50 grads).] [Horizontal discharge louvers.] [____________________.]

ELECTRIC CABINET HEATERS

Description: [Surface] [Recessed] wall-mounted cabinet heater with [fan forced air distributed over] resistance heating element.

Input Voltage: [120] [208] [240] [_____] volts, 60 Hz, single phase.

Output Rating: [_____] kW, [__________] cu ft/min.

Heating Element: [Enclosed copper tube, aluminum finned element of coiled nickel-chrome resistance wire centered in tubes and embedded in refractory material.] [Exposed helical coil of nickel-chrome resistance wire with refractory ceramic support bushings.]

Provide line voltage disconnect switch integral with thermostat to directly control heater element.

Fabrication: Fabricate cabinet of [heavy welded steel.] [____________________.]

Grill: Fabricate from [stamped steel sheet.] [extruded aluminum.]

Provide [hinged and latched] [captive-screw held] panel for electrical connection and control compartment.

Cabinet Finish: [Use corrosion-resisting primer and finish with [beige] [_____] baked enamel.] [______________________________.]

Grill Finish: [Use corrosion-resisting primer and finish with [beige] [_____] baked enamel.] [[Dark bronze] [_____] anodized.] [_________________________.]

Provide terminal blocks for power and control wiring connections.

ELECTRIC BASEBOARD UNITS

Description: [Wall] [Pedestal] mounted electric convector heater with resistance heating element.

Input Voltage: [120] [208] [240] [_____] volts, 60 Hz, single phase.

Output Rating: [_____] kW, [[_____] cu ft/min].

Heating Element: [Enclosed copper tube, aluminum finned element of coiled nickel-chrome wire embedded in refractory material.] [___________________.]

Element Hangers: [Ball bearing cradle type.] [__________.]

Provide line voltage disconnect switch integral with

thermostat to directly control heater element.

Fabrication: Fabricate cabinet of [heavy welded steel.] [extruded aluminum.] [_________________________.]

Grill: Fabricate from [stamped steel sheet.] [extruded aluminum.]

Provide captive-screw held panel for electrical connection and control compartment.

Cabinet Finish: [Use corrosion-resisting primer and finish with [beige] [_____] baked enamel.] [[Dark bronze] [_____] anodized.] [_________________________.]

Grill Finish: [Use corrosion-resisting primer and finish with [beige] [_____] baked enamel.] [[Dark bronze] [_____] anodized.]

Provide terminal blocks for power and control wiring connections.

ACCESSORIES

Room Thermostat: [NEMA DC 15; heating only [single line] [double line] break line voltage thermostat with control point reset, [thermometer,] [fan selector switch,] [and] [indicator lamps.] [NEMA DC 3; heating only [single line] [double line] break low voltage thermostat with control point reset, [thermometer,] [fan selector switch,] [and] [indicator lamps.] [Model [__________], manufactured by [_________________________.]

Mounting Accessories: [_________________________.]

PART 3 EXECUTION

EXAMINATION

Verify that field conditions are acceptable and are ready to receive work.

Verify that required utilities are available, in proper location, and ready for use.

Beginning of installation means installer accepts existing conditions.

INSTALLATION

Install in accordance with manufacturer's instructions.

Locate each unit in position indicated.

Install unit with sufficient clearance from adjacent construction, piping, ductwork, and other obstructions to

allow access for service and maintenance.

Support unit heaters from structure using construction details shown on Drawings.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [01410.]

Verify operation of each electric heating unit by measuring input voltage and current simultaneously for period of ten minutes of continuous operation.

DEMONSTRATION

Provide systems demonstration under provisions of Section [01650.] [_____.]

Demonstrate location of circuit breakers and switches serving electric heating branch circuits, and location and setting procedures for thermostats and other heating controls.

SCHEDULE

Unit Heater UH-1

Voltage: 115 volts, 60 Hz, single phase.

Capacity: 1.5 kW.

Fan Motor: 1/4 hp.

Location: Room 14.

Mounting: Suspend from ceiling at 8 feet above finished floor.

Unit Heater UH-2

Voltage: 115 volts, 60 Hz, single phase.

Capacity: 1.0 kW.

Fan Motor: 1/4 hp.

Location: Room 16.

Mounting: Suspend from ceiling at 8 feet above finished floor.

END OF SECTION