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The electric cabinet unit heater is designed for mounting in any position, fully recessed, semi-recessed or surface mounted. All capacities, voltages, physical sizes, grille arrangements and options shall be as specifiedon the plans. All units must be fieldconvertible to the following:
1. For control by a field supplied remote thermostat
2. Load management control with an external dry switch. When closed unit operates under control of either the internal or the external thermostat. When open, unit turns off.
3. Any grille arrangement.
CABINET: The cabinet shall be constructed of heavy duty 16 Gauge Zinc coated steel. The heater shall have a removable front door for easy access to the control panel, elements, motor-blower assembly, filtersand all internal components. The grill configurationmust be easily fieldconvertible to any air flowconfiguration(by removal of no more than four fasteners). The cabinet shall have a textured finishof two coats of powder coat epoxy and be suitable for use with optional kick space base.
HEATING ELEMENTS: The heating elements shall be warranted for 1 year and shall be non-glowing design consisting of special high temperature resistance wire enclosed in an incoloy sheath to which steel finsare furnace brazed. The heating elements shall be located directly in front of the blower discharge air for uniform heating. They shall be mounted with a single anchor at one end to minimize effects of thermal expansion and contraction.
SAFETY CUTOUT: Thermal safety limits shall be built into the system to automatically shut off heater in event of overheating due to any cause. The safety cutouts shall be of two types: A. The primary limit shall be an automatic capillary type to sense the heat along the full length of the heating elements. It shall de-energize the heaters by opening the coil circuit on the heating contactors. B. The secondary limit shall be a manual reset thermal device to interrupt power to the heating elements.
MOTOR AND BLOWER ASSEMBLY: The motors and blowers shall be direct drive and resiliently mounted on rigid heavy gauge frame for quiet operation and long life. The motor shall be two-speed, shaded pole type, rated for the voltage (480 to 600 Volts are single speed only). Each shall have built-in automatic reset overload protection and are life time lubricated. The motor shall be vented and mounted in the air stream to provide maximum cooling of the motor.
HIGH AND LOW HEAT RANGES: All units will be supplied as standard with a switch for selecting full heat at high fan speed or reduced heat at low fan speed (On 480 & 600 Volt units the switch changes the heat but not the fan speed).
OVER CURRENT PROTECTION: Circuit breakers shall be provided for branch circuit protection where required by NEC. Circuit breakers are optional on all other heaters.
TEMPERATURE CONTROL: Integral factory installed thermostat shall be tamper resistant, linear capillary type.