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4. 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.
4.1 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. The power cord type designation is H05RN-R/H07RN-F.
• 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 75°C minimum copper conductors only. See Electrical
Data In this section for ampacity, wire size and circuit protector require ment. 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"
dia. concentric knockouts are provided for connection of power wiring to unit.
• Power wiring is connected to the power terminal block in unit electric cabinet.
4.2 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.
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