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Reference - Model IGX
(Blower Control Center)
14 15
9
4
1
6 7
2
8
13
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.
1. Supply Motor Starter/VFD - 24 volt magnetic
contacts for starting supply motor.
2. Supply Overload/VFD - Provides electronic
overload protection to supply motor.
3. Low Voltage Transformer - Provides low voltage
to fan/heat/cooling enable controls.
4. Control Terminal Block - Provides wiring access
to controls.
5. Fan Relay - Allows power to pass to energize
motor starter.
6. Auxiliary Contact (Optional) - Provides one
normally closed and one normally open contact for
other equipment.
7. Exhaust Motor Starter (Optional) - 24 volt
magnetic contacts for starting exhaust motor.
8. Exhaust Overload (Optional) - Provides electronic
overload protection to exhaust motor.
9. Exhaust Fuses (Optional) - Provides proper
fusing for exhaust fan motor(s).
10. Building Freeze Protection Timer (Optional) -
Prevents the discharge of cold air into the building.
11. Heat Relay - Allows power to pass to heating
controls.
12. Low Voltage Transformer - Provides low voltage
to the optional evaporative cooling controls.
13. Inlet Air Sensor (Optional) - Outdoor air stat that
automatically controls the heating and/or cooling
based on outdoor air temperature.
14. Evaporative Cooling Fuses (Optional) - Provides
proper fusing to evaporative cooling pump and
controls.
15. Transformer Fuse (Optional) - Provides proper
fusing for evaporative cooling transformer.
34
Model IG / IGX Make-Up Air
12
10
17
19
20
16. Cooling Relay (Optional) - Allows power to pass
to cooling controls.
17. Reset Timer (Optional) - Resets cooling system
to run a time interval.
18. Auto Drain Relay (Optional) - Assures supply
pump does not operate during drain interval. Allows
3
pump to operate in cooling mode.
19. Cooling Timer (Optional) - Allows for automatic
draining of the evaporative cooling system based on
time schedule.
20. Dirty Filter Switch (Optional) - Monitors filter
pressure drop. Turns on indicating light when
pressure drop is above field adjustable set point.
®
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