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6 ELECTRICAL WIRING
Field wiring must comply with the National Electric Code
(NEC) or Canadian Electrical Code (CEC) and any
applicable local ordinance.
WARNING
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.
When installing power cables (in the middle) and signal
cables (in the top) of the whole device, first remove the
cable running apron, install the bushing, and finally
install the power cables.
6.1 Power Wiring
1. Proper electrical power should be available at unit.
Voltage tolerance should not be over 10% from rating
voltage.
2. If any of the wire must be replaced, replacement wire
must be the same type as shown in nameplate, wiring
diagram and electrical data sheet.
3. Install a branch circuit disconnect of adequate size to
handle starting current, located within sight of, and
readily accessible to the unit.
4. ELECTRIC HEATER - If the Electric Heater is
installed, unit may be equipped with 30~60A. circuit
breakers or fuse. 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 221 °F minimum
copper conductors only.
See Electrical Data in this section for ampacity, wire size
and circuit protector requirements. Supply circuit
protective devices may be either fuses or "HACR" type
circuit breakers.
• 1-3/8" knockouts inside the cabinet are provided for
connection of power wiring to electric heater.
• Power wiring is connected to the power terminal block
in unit electric cabinet.
See Electrical Heater Installation Instruction for details.
6.2 Grounding
WARNING
The unit must be permanently grounded. Failure
to do so can result in electrical shock causing
personal injury or death.
• The unit must be electrically grounded in accordance
with local codes or the national electric code.
• Grounding may be accomplished by attaching ground
wire(s) to ground lug(s) provided in the unit wiring
compartment.
6.3 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 50 ft, 16 AWG
wire should be used.
• Two 7/8" holes can be used for control wires going into
the unit, one on left side and one at the bottom.
• Make sure, after installation, separation of control
wiring and power wiring has been maintained.
Thermostat should be mounted on an inside wall about
58" from floor and will not be affected by unconditioned
air, sun and/or heat exposure. Follow the instruction
carefully because there are many wiring requirements.
See Fig. 6-1 ~ 2, Table 6-1.
UNIT CONTROL BOARD
TERMINAL STRIP
THERMOSTAT
**
R
G
Y
*
W
***
B
C
Fig. 6-1 Typical Field Control Wiring Diagram
*** B wire be used with heat pump system only,
reversing valve energizes at the heating mode, and
cut off at the cooling mode.
** Minimum wire size of 18 AWG wire should be used
for all field installed 24 volt wire.
* Only required on units with supplemental electric
heat.
09
R
240V
G
208V
Y
W1
W2
COM
B
C
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