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   PART 1 - GENERAL

    01 DESCRIPTION OF WORK

    A. Extent of electric unit heater work is indicated by drawings and schedules.

    B. Types of unit heaters in this section include the following:

    1. Propeller unit heaters.

    2. Cabinet heaters.

    C. Refer to Division-16 sections for electrical wiring work required in conjunction with heating terminals; not work of this section.

    02 QUALITY ASSURANCE:

    A. Manufacturers: Firms regularly engaged in manufacture of electrical unit heaters, of types, ratings, and capacities required, whose products have been in satisfactory use in similar service for not less than 5 years.

    B. NEC Compliance: Comply with applicable heating terminal installation requirements of NEC pertaining to installation of space heating equipment and appliances.

    C. UL Compliance and Labeling: Comply with applicable requirements of UL 486A, "Wire Connectors and Soldering Lugs for Use with Copper Conductors". Provide heating terminals which are UL-listed and labeled.

    D. ASHRAE Compliance: Comply with ASHRAE requirements pertaining to applications and installation of electric heating terminals.

    03 SUBMITTALS:

    A. Product Data: Submit manufacturer's data on electric unit heaters, including dimensions, capacities, ratings, performance characteristics, gages and finishes of materials, and installation instructions.

    B. Wiring Diagrams: Submit wiring diagrams for electrical unit heaters showing connections to electrical power feeders, and associated control wiring. Clearly differentiate between portions of wiring that are manufacturer-installed and portions to be field-installed.

   PART 2 - PRODUCTS

    04 PROPELLER UNIT HEATERS

    A. Materials and Equipment:

    1. General: Except as otherwise indicated, provide manufacturer's standard electric propeller unit heater materials and components as indicated by published product information, designed and constructed as recommended by manufacturer, and as required for complete installation.

    B. Heating Elements:

    1. General: Except as otherwise indicated, provide manufacturer's standard elements of the indicated duty and rated for the indicated capacity, consisting of resistance elements in steel sheath with extended fins, or in spiral sheath.

    2. Electric Heating Capacity: Size element for the indicated fan speed, CFM, room heating load (Btuh), entering air temperature, and electric input (watts, voltage, phase).

    C. Casings:

    1. General: provide casings braced and reinforced to provide required stiffness, and containing heating element supports. Provide rounded corners. Phosphatize and paint casings inside and out with one coat of baked-on enamel; zinc plate hardware. Include fan orifice (venturi) in casing, as well as threaded hanger connections (weld nuts). Fabricate from 18-gage steel.

    D. Air Deflectors:

    1. General: Provide manufacturer's standard air deflectors of the following types.

    a) 2-way horizontal lou vers.

    b) 4-way finned louvers.

    c) Cone diffusers.

    d) Vane outlets.

    e) Louver outlets.

    f) Anemostat diffusers.

    g) Revolving diffusers.

    B. Motors:

    1. General: Provide totally enclosed shaded pole or permanent split capacitor motors, class "B" insulation, resiliently mounted, tap wound with built-in thermal overload protection, sleeve bearings or permanently lubricated ball bearings. Current characteristics: 120-volt, 60 Hz, single phase.

    2. Motor Controls: Provide a remote, wall mounted, multi-speed motor control switch with an "OFF" position.

    3. Internal Wiring: Provide high temperature, heat-resistant wiring in flexible metal conduit from terminal junction box to electrical devices. Provide fuses in motor and control circuit wiring.

    C. Devices: Provide the following devices:

    1. Thermally activated fan switch to keep fan motor operation until residual heat is dissipated.

    2. Disconnect switch.

    3. Automatic reset, high limit cut-out switch located in discharge air stream.

    4. Magnetic contractor.

    5. Transformer.

    6. Manual "Summer-Off-Winter" switch.

    7. Wall-mounted thermostat.

    D. Fans:

    1. General: Provide aluminum propeller fans, balanced statically and dynamically of indicated capacity. Provide fans suitable for standard or sparkproof application.

    2. Vibration Isolation: Refer to Division-15 sections.

    E. Manufacturer: Subject to compliance with requirements, provide propeller unit heaters of one of the following:

    1. Chromalox Div., Emerson Electric Co.

    2. Erincraft Mfg. Co., Inc.

    3. Federal Pacific Electric Co.

    4. Fostoria Industries, Inc.

    5. Gould Inc.

    6. Market Nutone Div.; Scoville Inc.

    7. TPI Corp.

    8. Trane Co.

   PART 3 - EXECUTION

    05 INSTALLATION OF ELECTRIC UNIT HEATERS

    A. Install electric unit heaters as indicated, in accordance with equipment manufacturer's written instructions, and with recognized industry practices, to ensure that heating terminal equipment fulfills requirements. Comply with applicable installation requirements of NEC and NECA's "Standard of Installation".

    B. Coordinate with electrical work, including wiring/cabling work, as necessary to interface installation of heating terminals with other work.

    C. Clean dust and debris from each electric unit heater as it is installed to ensure cleanliness.

    D. Comb out damaged fins where bent or crushed before covering elements with enclosures.

    E. Touch-up scratched or marred heating terminal enclosure surfaces to match original finishes.

    F. Connectors and terminals shall be tightened, including screws and bolts, shall be tightened in accordance with equipment manufacturer's published torque tightening values for equipment connectors. Where manufacturer's torquing requirements are not indicated, connectors and terminals shall be tightened to comply with tightening torques specified in UL Std 486A.

    06 GROUNDING

    A. Provide equipment grounding connections. Tighten connections to comply with tightening torque values specified in UL Std 486A to assure permanent and effective grounds.

    07 TESTING

    A. Upon completion of installation of electric unit heaters and after building circuitry has been energized, test electric unit heaters to demonstrate capability and compliance with requirements. Where possible, field correct malfunctioning units, then retest to demonstrate compliance.

    END OF SECTION