Staged - Greenheck IG Installation, Operation And Maintenance Manual

Reference - Model IG

(8:1 Staged)

19 20
25 10
4
1 7 8
15
3
9
2
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.
1. Supply Motor Starter - 24 volt magnetic contacts
for starting supply motor.
2. Supply Overload - Provides electronic overload
protection to supply motor.
3. Low Voltage Transformer - Provides low voltage
to fan/heat/cooling enable controls, staged
furnace controls and optional evaporative cooling
controls.
4. Control Terminal Block - Provides wiring access
to controls.
5. Fan Relay - Allows power to pass to energize
motor starter.
6. Control Terminal Block - Provides wiring access
to fan/heat/cooling enable controls.
7. Auxiliary Contact (Optional) - Provides one
normally closed and one normally open contact
for other equipment.
8. Exhaust Motor Starter (Optional) - 24 volt
magnetic contacts for starting exhaust motor.
9. Exhaust Overload (Optional) - Provides
electronic overload protection to exhaust motor.
10. Exhaust Fuses (Optional) - Provides proper
fusing for exhaust fan motor(s).
11. Building Freeze Protection Timer (Optional) -
Prevents the discharge of cold air into the
building.
12. Heat Relay - Allows power to pass to heating
controls.
13. Low Voltage Transformer - Provides low voltage
to the ignition controller.
14. Heating Terminal Block - Provides wiring access
to heating controls.
15. Inlet Air Sensor (Optional) - Outdoor air stat that
automatically controls the heating and/or cooling
based on outdoor air temperature.
64
Model IG / IGX Make-Up Air
24 11
22
16
14
13
6
18
18
NOTE
16. Stage Controller - Provides 8 stage control of the
furnace.
17. Airflow Switch - Monitors the airflow inside the
heat exchanger.
18. Ignition Controller - Controls the ignition of the
17
furnace. Maintains safe operation of the furnace.
19. Evaporative Cooling Fuses (Optional) - Provides
proper fusing to evaporative cooling pump and
controls.
20. Transformer Fuse (Optional) - Provides proper
fusing for evaporative cooling transformer.
21. Cooling Relay (Optional) - Allows power to pass
to cooling controls.
22. Reset Timer (Optional) - Resets cooling system
to run a time interval.
23. Auto Drain Relay (Optional) - Assures supply
pump does not operate during drain interval.
Allows pump to operate in cooling mode.
24. Cooling Timer (Optional) - Allows for automatic
draining of the evaporative cooling system based
on time schedule.
25. Dirty Filter Switch (Optional) - Monitors filter
pressure drop. Turns on indicating light when
pressure drop is above field adjustable set point.
Gas
Pressure
Test Port
Small
Manifold
Gas Supply
Staged Gas
Connection
Valves
Gas Pressure
3/4 inch
Test Port
Large
Manifold
®