Installation - Electrical Wiring
IMPORTANT
Before connecting power to the unit, read and understand the following instructions and wiring diagrams. Complete wiring diagrams are attached on the inside of the control center door(s).
IMPORTANT
All wiring should be done in accordance with the latest edition of the National Electrical Code ANSI/ NFPA 70 and any local codes that may apply. In Canada, wiring should be done in accordance with the Canadian Electrical Code.
caution
If replacement wire is required, it must have a temperature rating of at least 105ºC, except for energy
IMPORTANT
The equipment must be properly grounded. Any wiring running through the unit in the airstream must be protected by metal conduit, metal clad cable or raceways.
danger
High voltage electrical input is needed for this equipment. This work should be performed by a qualified electrician.
caution
Any wiring deviations may result in personal injury or property damage. Manufacturer is not responsible for any damage to, or failure of the unit caused by incorrect final wiring.
IMPORTANT
Manufacturer’s standard control voltage is 24 VAC. Control wire resistance should not exceed 0.75 ohms (approximately 285 feet total length for 14 gauge wire; 455 feet total length for 12 gauge wire). If the resistance exceeds 0.75 ohms, an
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1.Determine the Size of the Main Power Lines
The unit’s nameplate states the voltage and the unit’s total MCA. The main power lines to the unit should be sized accordingly. The nameplate is located on the outside of the unit on the control panel side.
Voltage, Hertz, Phase
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SUP HP |
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| EXH HP |
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MCA |
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| MOP |
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Unit’s Total MCA
Electrical Nameplate
2.Provide the Opening(s) for the Electrical Connections
Electrical openings vary by unit size and arrangement and are
3. Connect the Main Power
Connect the main power lines to the disconnect switch and main grounding lug(s). Torque field connections to 20
4. Wire the Optional Convenience Outlet
The convenience outlet requires a separate 115V power supply circuit. The circuit must include short circuit protection which may need to be supplied by others.
5. Wire the Optional Accessories
Reference the ladder diagram on the inside of the control center door for correct wiring of the following accessories:
• Selectra Stat | • Dirty Filter Indicator |
• Room Override | • TSCP |
• Blower Switch | • KSCP |
• Heat Switch | • Economizer Activator |
• Indicating Lights | • Room Stat |
note
Wiring to the Selectra Stat or room override should be in separate conduit or run with shielded cable.
note
The TSCP and KSCP remote panels have number-
Model IG / IGX