Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 82)

82
Reference - Model IG (Single or 2 Stage)
3 ⁄
4
inch Gas Supply
Connection
Staged Gas
Valve Manifold Gas Pressure
Test Port
Reference
1
6 7 8 9 10 11 12
2 3 4 5
1. Building Freeze Protection - Prevents the discharge of cold air into the building
2. Evaporative Cooling Controls (Optional) - Controls the evaporative cooler.
3. Fusing - Provides 24 VAC fusing for controls and fusing for the combustion blower.
4. Main Disconnect - Provides single point power connection to the unit.
5. Stage Controller - Provides single or two stage control of the furnace.
6. Motor Starter(s) - Magnetic contact(s) for starting motor(s). Comes standard with electronic overload,
auxiliary contact(s) optional.
7. Ignition Controller - Controls the ignition of the furnace. Maintains safe operation of the furnace.
8. Terminal Strip - Provides easy, number coded wiring of the control.
9. Main Transformer - Provides 24 VAC for controls.
10. Time Delay - Temporarily runs the combustion blower after the furnace has shut down (post-purge).
11. Dirty Filter Switch - Switch trips when filter are dirty and pressure loss is higher than set point.
12. Airflow Switch - Monitors the airflow inside the heat exchanger.
13. Inlet Air Sensor (not shown) - Shuts down furnace when the outside air is above the set point.
14. Grounding Lugs (not shown) - Completes electrical circuit.
15. Heat/Cool Relay (not shown) - 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.