Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 84)

84
Reference - Model IG (2:1 Modulating)
Manifold
Gas Pressure
Test Port
3 ⁄
4
inch Gas Supply
Connection
Staged Gas
Valve
Modulating
Gas Valve
Reference
1
7 9 10 11
3
8 12 13
2 4 5 6
1. Building Freeze Protection - Prevents the discharge of cold air into the building.
2. Evaporative Cooling Controls (Optional) - Controls the evaporative cooler.
3. Motor Starter(s) - Magnetic contact(s) for starting motor(s). Comes standard with electronic overload,
auxiliary contact(s) optional.
4. Fusing - Provides 24 VAC fusing for controls and fusing for the combustion blower.
5. Main Disconnect - Provides single point power connection to the unit.
6. Amplifier - Controls the modulating valve based on input from the temperature selector and the
discharge air sensor.
7. Ignition Controller - Controls the ignition of the furnace. Maintains safe operation of the furnace.
8. Time Delay - Temporarily runs the combustion blower after the furnace has shut down (post-purge).
9. Terminal Strip - Provides easy, number coded wiring of the control.
10. Main Transformer - Provides 24 VAC for controls.
11. Temperature Selector - Allows the user to adjust the discharge air temperature.
12. Airflow Switch - Monitors the airflow inside the heat exchanger.
13. Dirty Filter Switch - Switch trips when filters are dirty and pressure loss is higher than set point.
14. Inlet Air Sensor (not shown) - Shuts down furnace when the outside air is above the set point.
15. Grounding Lugs (not shown) - Completes electrical circuit.
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.