Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 90)

90
Reference - Model IGX (4:1 Modulation)
Gas Pressure
Test Port
Modulating
Gas Valve
Staged Gas
Valve
Manifold
1
2
3
4
6
7
8
5
1. Amplifier - Controls the modulating valve based on input from the temperature selector and the
discharge air sensor.
2. Combustion Blower Relays - Pass power to the variable speed combustion blower.
3. Transformer - Provides 24V power to the amplifier.
4. Modulation Controller - Provides 4:1 modulation control of the furnace.
5. Ignition Controller - Controls the ignition of the furnace. Maintains safe operation of the furnace.
6. Terminal Strip - Provides easy, number coded wiring of the control.
7. Input Converter - Receives and converts signal from a building management system.
8. Airflow Switch - Monitors the airflow inside the heat exchanger.
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