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Electrical Wiring
Field wiring must comply with the National Electrical Code*
and local ordinances that may apply.
*C.E.C. in Canada
Power Wiring
1 It is important that proper electrical power is available at
the unit. Voltage should not vary more than 10% from
that stamped on the unit rating plate. On three phase
units, phases must be balanced within 3%.
2 Install a branch circuit disconnect within sight of the unit
and of adequate size to handle the starting current. (See
Tables A and F.) A bracket is shipped with the unit for
mounting the disconnect. Reference Figure 12 for proper
location.
3 For branch circuit wiring (main power supply to unit dis-
connect), the minimum wire size can be determined from
Table B using the circuit ampacity found on the unit
nameplate or from Tables A and E.
4 This unit incorporates single point electrical connection
for unit and electric heat accessory.
5 Power wiring must be run in grounded rain-tight conduit.
Connect the power field wiring as follows:
a NO ELECTRIC HEAT - Connect the field wires
directly to the contactor pigtail in the electric heat
access area. Connect ground wire to ground lug.
b WITH ELECTRIC HEAT - Connect the field wires to
the terminal block on the electric heater kit in the elec-
tric heat access area. Connect the ground wire to the
ground lug on the heater kit.
NOTE: For field installation of a heater kit, follow the instructions
provided with the heater kit.
6 The pigtail wires in the electric heat access area are facto-
ry wired to the contactor in the control box.
7 DO NOT connect aluminum field wires to electric heat
kit power input terminals.
Control Wiring
(CLASS II)
1 Low voltage wiring should not be run in conduit with
power
wiring.
2 Control wiring is routed through the 7/8" hole adjacent to
the compressor access panel. See Figure 2. Use a mini-
mum #18 AWG thermostat wire. For wire lengths
exceeding 50', use #16 AWG thermostat wire. The low
voltage wires are connected to the unit pigtails which are
TABLE B: COPPER WIRE SIZE — AWG
300
4
3
2
4
4
3
Supply
250
Wire
200
6
4
4
Length
150
8
6
6
Feet
100
10
8
8
50
14
12
10
15
20
25
NOTE:
1. Wire size based on 60ºC type copper conductors below 100 ampacity.
12
2
1
1/0
1/0
2/0
2/0
3
2
1
1
1/0
1/0
4
3
2
2
1
1
4
4
4
3
3
2
6
6
6
4
4
4
10
8
8
6
6
6
30
35
40
45
50
55
supplied with the unit in the low voltage connection box
located below the unit control box.
3 Figure 14 shows representative low voltage connection
diagrams. Read your thermostat installation instructions
for any special requirements for your specific thermostat.
NOTE: Units installed in Canada require that an outdoor
thermostat (30,000 min. cycles of endurance) be installed
and be wired with C.E.C. Class I wiring.
Figure 12: Recommended Location of Branch Circuit
Disconnect
TO POWER
BRANCH CIRCUIT DISCONNECT
Internal Wiring
1 A diagram of the internal wiring of this unit is located on
the inside of the compressor access panel. If any of the
original wire as supplied with the unit must be replaced,
the wire gauge and insulation must be the same as origi-
nal wiring.
208 Volt Applications
Transformer is factory-wired for 220 volts on 200/220 volt
models and must be changed for 200-volt applications. See
unit wiring diagram for 200-volt wiring.
Grounding
The unit must be permanently grounded. A grounding lug is
provided in the electric heat kit access area for a ground
wire. Failure to ground this unit can result in fire or electrical
shock causing property damage, severe personal injury or
death.
(1% VOLTAGE DROP)
3/0
3/0
3/0
4/0
4/0
4/0
2/0
2/0
2/0
3/0
3/0
3/0
1/0
1/0
1/0
2/0
2/0
2/0
2
1
1
1/0
1/0
1/0
3
3
2
2
2
1
4
4
4
3
3
3
60
65
70
75
80
85
Circuit Ampacity
2. Wire size based on 75ºC type copper conductors for 100 ampacity and above.
TO CONTROL
▲ ▲
!
DANGER
4/0
250
250
250
250
300
4/0
4/0
4/0
4/0
4/0
250
3/0
3/0
3/0
3/0
3/0
4/0
1/0
2/0
2/0
2/0
2/0
2/0
1
1
1
1
1/0
1/0
2
2
2
2
2
1
90
95
100
105
110
115
300
300
250
250
4/0
4/0
3/0
3/0
1/0
1/0
1
1
120
125
IM 865
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