Start-Up; Electrical - Greenheck IGX Installation, Operation And Maintenance Manual

Start-Up Instructions:

Electrical

Any wiring deviations may result in personal injury or property damage. Greenheck is not
responsible for any damage to, or failure of the unit caused by incorrect field wiring.
Sequence for Wiring Units
For all units:
1. The unit's nameplate states the voltage and total amperage (MCA's) required.
The main feeder supplying power to the unit should be sized for the nameplate voltage and
amperage.
2. For the main power connection, a field supplied opening will be needed. The recommended location is
through the control center cabinet, refer to figure 4.
3. Bring the supply power to the unit and connect to the disconnect switch.
Make sure that the disconnect lugs are securely tightened.
4. Connect optional remote control panel wiring to terminal strip in the control center.
Greenheck's standard control voltage is 24 VAC.
5. Wire any optional remote temperature selectors at this time. These wires should be in shielded cable or
separate conduit.
6. When an optional convenience outlet is provided, a separate power supply (115/60/1) must be provided
to the receptacle. This circuit must be on a ground fault breaker.
7. Wire power lead for CUBE exhaust fan through side breather tube. The power lead should be of
sufficient length as to allow the CUBE fan to hinge open and to allow service of the burner controls.
NOTE: Any wiring running through the unit in the airstream must be protected by
flexible conduit, metal clad cable or raceways.
IMPORTANT: Use minimum 14 ga. wire for 24 volt control power.
Control wire resistance should not exceed 0.75 ohms (approximately 285 feet total
length for 14 ga. wire; 455 feet total length for 12 ga. wire). If wire resistance
exceeds 0.75 ohms, an industrial-style, plug-in relay should be added to the unit
control center and wired in place of the remote switch. The relay must be rated for
at least 5 amps and have a 24 Vac coil. Failure to comply with these guidelines may
cause motor starters to "chatter" or not pull in which can cause contactor failures
and/or motor failures.
CAUTION !
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