Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 86)

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Reference - Model IGX (Blower Control Center)
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1. Main Transformer - Provides 24 VAC for controls.
2. Control Fusing - Provides 24 VAC fusing for controls.
3. Blower Fusing - Provides fusing for supply and optional exhaust blower(s).
4. Combustion Blower Fusing - Provides fusing for combustion blower(s).
5. Solid Fuel Time Delay - Temporarily runs blower(s) after the unit has been manually shutdown.
6. Dirty Filter Switch - Switch trips when filters are dirty and pressure loss is higher than set point.
7. Building Freeze Protection - Shuts down blower when discharge air temperature drops below set point
and remains below set point for longer than the time delay. Prevents the discharge of cold air into the
building.
8. Inlet Air Sensor - Shuts down furnace when the outside air is above the set point.
9. Terminal Strip - Provides easy, number coded wiring of the control.
10. Main Disconnect - Provides single point power connection to the unit.
11. Grounding Lugs - Completes electrical circuit.
12. Motor Starter(s) - Magnetic contact(s) for starting motor(s). Comes standard with electronic overload,
auxiliary contact(s) optional.
13. Evaporative Cooling Controls (Optional) - Controls the evaporative cooler.
14. Heat/Cool Relay - Passes power to the furnace or cooling controls.
NOTE!
This is a typical blower control center, the control center in your unit may be different. Reference the
ladder diagram on the inside of the control center door for a unit specific wiring diagram.
Reference