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HDG Series Air Handler INSTALLATION INSTRUCTIONS Heat Controller, Inc.
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Horizontal units must be congured for right hand air supply or left hand air supply. Horizontal
drain pan must be located under indoor coil. Failure to use the drain pan can result in property
damage.
Conversion in Horizontal Direction: Horizontal left-hand supply can be changed to horizontal
right-hand supply by removing the indoor coil and reinstalling 180° from original.
4.4 INSTALLATION IN AN UNCONDITIONED SPACE
IMPORTANT: There are two pairs of coil rails in the air handler for default and counter ow
application. If the air handler is installed in an unconditioned space, the two unused coil rails
should be removed to minimize air handler surface sweating. The coil rails can be easily re-
moved by taking off the 6 mounting screws from both sides of the cabinet.
5.0 ELECTRICAL WIRING
Field wiring must comply with the National Electric Code (C.E.C. in Canada) and any applicable
local ordinance.
Disconnect all power to unit before installing or servicing. More than one disconnect switch may
be required to de-energize the equipment. Hazardous voltage can cause severe personal injury
or death.
5.1 POWER WIRING
It is important that proper electrical power is available for connection to the unit model
being installed. See the unit nameplate, wiring diagram and electrical data in the installation
instructions.
• If required, install a branch circuit disconnect of adequate size, located within sight of,
and readily accessible to the unit.
• IMPORTANT: After the Electric Heater is installed, units may be equipped with one, two,
or three 30/60 amp. circuit breakers. These breaker(s) protect the internal wiring in the
event of a short circuit and serve as a disconnect. Circuit breakers installed within the
unit do not provide over-current protection of the supply wiring and therefore may be
sized larger than the branch circuit protection.
• Supply circuit power wiring must be 167°F [75°C] minimum copper conductors only. See
Electrical Data In this section for ampacity, wire size and circuit protector requirement.
Supply circuit protective devices may be either fuses or “HACR” type circuit breakers.
• Power wiring may be connected to either the right, left side or top. Three 7/8”, 1-3/8”,
1-3/4” diameter concentric knockouts are provided for connection of power wiring to unit.
• Power wiring is connected to the power terminal block in unit electric cabinet.
Caution