Reference - Model IG (Single or 2 Stage)
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| 22 | 24 |
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| 19 | 20 |
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| 12 21 23 | 5 | 17 |
25 |
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| 13 | 14 |
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| 4 | 6 |
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1 | 7 | 8 |
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15 |
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| 16 | 16 |
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| 18 |
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2 |
| 9 |
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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 - 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.
16.Stage Controller - Provides single or two stage control of the furnace.
17.Airflow Switch - Monitors the airflow inside the heat exchanger.
18.Ignition Controller - Controls the ignition of the 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 | Staged Gas | ||
Pressure | Valve | ||
Test Port |
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Manifold |
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| 3/4 inch |
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| Gas Supply | ||
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| Connection | |
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Model IG / IGX
