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General
All wiring must be installed in accordance with the National
Electrical Code and local codes. In Canada, all wiring must be
installed in accordance with the Canadian Electrical Code and in
accordance with the regulations of the authorities having
jurisdiction. Power supply voltage must conform to the voltage
shown on the unit serial plate. A wiring diagram of the unit is
attached to the inside of the electrical cover. The power supply
shall be sized and fused according to the specifications supplied.
A ground lug is supplied in the control compartment for
equipment ground.
The unit rating plate lists a "Maximum Time Delay Fuse" or
"HACR Type" circuit breaker that is to be used with the
equipment. The correct size must be used for proper circuit
protection and also to assure that there will be no nuisance tripping
due to the momentary high starting current of the compressor
motor.
Control Circuit Wiring
For split systems, the minimum control circuit wiring gauge
needed to insure proper operation of all controls in both indoor and
outdoor units will depend on two factors.
1. The rated VA of the control circuit transformer.
2. The maximum total distance of the control circuit wiring. (This
is the distance between the wall thermostat to the indoor unit
plus the distance between the indoor unit to the outdoor unit.)
The following table should be used to determine proper gauge
of control circuit wiring required.
Wiring Instructions
Table 6 — Control Circuit Wiring
Rated VA of
Control Circuit
Transformer
40
50
65
Example: 1. Control circuit transformer rated at 40VA.
2. Maximum total distance of control circuit wiring
85 feet.
From Table 6, minimum of 18 gauge wire should be used in the
control circuit wiring.
For control circuit transformers rated other then those listed, use
the next lower rated transformer listed.
Example: 1. Control circuit transformer rated at 55VA.
From table use 50VA transformer.
Maximum Total
Transformer
Distance of
Secondary
Control Circuit
FLA @ 24V
Wiring in Feet
20 gauge - 65
18 gauge - 90
1.6
16 gauge - 145
14 gauge - 230
20 gauge - 45
18 gauge - 60
2.1
16 gauge - 100
14 gauge - 160
12 gauge - 250
20 gauge - 40
18 gauge - 55
2.7
16 gauge - 85
14 gauge - 135
12 gauge - 210
Manual 2100-292
Page 7
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