Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 40)

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Start-Up - 8:1 Staged Control
Start-Up
Step 8 Access the Inlet Air Sensor
Setting
From the program menu, use the up or down key to
navigate through the menu options until the display
reads “iAS.” Once the display reads “iAS,” press the
enter key. The display will change to the inlet air
sensor setting.
NOTE!
Steps 8 - 9 are provided for adjusting the inlet air set point. The inlet air sensor is preset to the
factory recommended 65ºF, only adjust if needed.
NOTE!
The inlet air sensor monitors the temperature of the inlet air. If the inlet air is above the sensor’s set
point, the inlet air sensor shuts off the furnace and continues to supply the warm outside air.
NOTE!
After modifying a setting, the enter key must be
pressed to save the change. If the enter key is
not pressed the display will return to the
program menu without saving the change.
NOTE!
The room override function requires a field supplied thermostat to be installed in the space and to be
wired between terminal 31 and 32 in the unit’s control center. Reference the unit ladder diagram.
Step 9 Edit the Setting
Use the up or down keys to change the inlet air
setting. When the correct setting is displayed, press
the enter key to save the setting and return to the
program menu.
NOTE!
Steps 10 - 11 are provided for adjusting the room override setting. Only adjust the setting if the room
override function is desired.
NOTE!
The room override function temporarily changes the discharge air temperature to the room override
setting if the room thermostat is not satisfied.
Step 10 Access the Room Override
Setting
From the program menu, use the up or down key to
navigate through the menu options until the display
reads “rot.” Once the display reads “rot,” press the
enter key. The display will change to the room
override setting.