Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 89)

89
Reference - Model IGX (2:1 Modulation)
Gas Pressure
Test Port
Modulating
Gas Valve
Staged Gas
Valve
Manifold
1
2
3
4
5
6
7
1. Amplifier - Controls the modulating valve based on input from the temperature selector and the
discharge air sensor.
2. Temperature Selector - Allows the user to adjust the discharge air temperature.
3. Ignition Controllers - Controls the ignition of the furnace. Maintains safe operation of the furnace.
4. Terminal Strip - Provides easy, number coded wiring of the control.
5. Combustion Blower Contact - Passes power to the combustion blower.
6. Airflow Switch - Monitors the airflow inside the heat exchanger.
7. Time Delay - Temporarily runs the combustion blower after the furnace has shut down (post-purge).
NOTE!
This is a typical furnace 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