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Heat Controller, Inc. INSTALLATION INSTRUCTIONS HDG Series Air Handler
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5.2 CONTROL WIRING
IMPORTANT: Class 2 low voltage control wiring should not be run in conduit with main power
wiring and must be separated from power wiring, unless class 1 wire of proper voltage rating is
used.
• Low voltage control wiring should be 18 Awg. color-coded. For lengths longer than 100 ft.,
16 Awg. wire should be used.
• Low voltage control connections are made to low voltage pigtails extending from top of air
handler (upow position - see Figure 3). Connections for control wiring are made with wire
nuts. Control wiring knockouts (518 and 7/8) are also provided on the right and left side of
the unit for side connection.
• See wiring diagrams attached to indoor and outdoor sections to be connected.
• Make sure, after installation, separation of control wiring and power wiring has been
maintained.
5.3 GROUNDING
The unit must be permanently grounded. FaIlure to do so can result In electrical shock
causing personal injury or death.
• This product must be sufciently ground in accordance with National Electric Code (C.E.C.
in Canada) and any applicable local ordinace.
• Grounding may be accomplished by grounding metal conduit when installed in accord
ance with electrical codes to the unit cabinet.
• Grounding may also be accomplished by attaching ground wire(s) to ground lug(s)
provided in the unit wiring compartment.
• Ground lug(s) are located close to wire entrance on left side of unit (up-ow). Lug(s) may
be moved to marked locations near wire entrance on right side of unit (upow). If alternate
location is more convenient.
• Use of multiple supply circuits require grounding of each circuit to lug(s) provided in unit.
Caution