ELECTRICAL INFORMATION
The unit must be electrically grounded in accordance with the current National Electrical Code, ANSI/NFPA No. 70. In Canada, use current C.S.A. Standard C22.1, Canadian Electrical Code, Part 1. In addition, the installer should be aware of any local ordinances or electrical company requirements that might apply.. System power wiring must be properly fused and conform to the local and national electrical codes.. System power wiring is to the unit main disconnect (door interlocking disconnect switch standard on most units) or distribution block and must be compatible with the ratings on the nameplate: supply power voltage, phase, and amperage (Minimum Circuit Amps - MCA, Maximum Overcurrent Protection - MOP).. All wiring beyond this point has been done by the manufacturer and cannot be modified without affecting the unit’s agency / safety certification..
If field installing an additional disconnect switch, it is recommended that there is at least four feet of service room between the switch and system access panels.. When providing or replacing fuses in a fusible disconnect, use dual element time delay fuses and size according to the rating plate..
If power supply is desired thru bottom of unit, run the wiring through the curb, cut a hole in the cabinet bottom, and wire to the disconnect switch..
The electric supply to the unit must meet stringent requirements for the system to operate properly.. Voltage supply and voltage imbalance between phases should be within the following tolerances.. If the power is not within these voltage tolerances, contact the power company prior to operating the system..
Voltage Supply - See voltage use range on the rating plate.. Measure and record each supply leg voltage at all line disconnect switches.. Readings must fall within the allowable range on the rating plate..
Voltage Imbalance - In a
Key: | V1, V2, V3 = line voltages as measured |
| VA (average) = (V1 + V2 + V3) / 3 |
| VD = Line voltage (V1, V2 or V3) that deviates farthest from average (VA) |
Formula: | % Voltage Imbalance = [100 x |
CAUTION
If any of the original wire as supplied with the appliance must be replaced, it must be
replaced with wiring material having a temperature rating of at least 105ºC.
WARNING
To prevent injury or death due to electrocution or contact with moving parts, lock disconnect switch open.
WARNING
For units with a gas furnace, if you turn off the
power supply, turn off the gas.
Most factory supplied electrical components are
Field Control Wiring Length/Gauge
Total Wire Length | Minimum Wire Gauge |
125 ft.. | 18 |
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200 ft.. | 16 |
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300 ft.. | 14 |
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450 ft.. | 12 |
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If wire resistance exceeds 0..75 ohms, an
Note: Standard factory installed electric
6