Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 54)

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Operation - 4:1 Modulation & 8:1 Staged User Interface
Escape
Key
L1 L2 L3
Enter
Key
Up Key
Down
Key
Program Mode
Program mode allows the user to view the program menu and edit the factory default settings. To access
program mode and view the program menu press and hold the escape key for three seconds. While viewing the
program menu press the up and down keys to scroll through the menu options. To view the setting of the
selected menu option press the enter key. To edit the setting, press the up or down key while viewing the
setting. To save the setting and return to the program menu press the enter key. To return to the program menu
without saving the change, wait 10 seconds. To exit program mode from the program menu, wait 10 seconds.
Inlet Air Sensor (IAS)
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. The inlet air
sensor is preset to the factory recommended 65ºF for
8:1 and 60ºF for 4:1.
Discharge Air Temperature (DtS)
The discharge air temperature setting is the
temperature that the unit will discharge. The
discharge air temperature is preset to the factory
recommended 70ºF. The actual discharge air
temperature is the default display.
Optional Freeze Protection (FtS)
If the discharge temperature drops below the freeze
temperature setting (default 45ºF) and remains below
the setting for longer than the time delay setting
(default 300 sec), the blower and burner will shut
down to prevent the discharge of cold air into the
building.
Optional Room Override (ROt)
When the room override function is triggered, the
discharge air temperature (70ºF default) is temporarily
changed to the room override setting (90ºF default).
When the room override function is released the
discharge air temperature returns to the default
temperature.
NOTE!
The enter key must be pressed to save any
changes made to a setting.
WARNING!
Changing the default settings will significantly
affect performance. Only change a setting after
reading and understanding this entire manual.
Outside Air Temperature (OAt)
To temporarily display the outside air temperature,
use the up and down keys until the display reads
“OAt,” then press the enter key.
Program Revision Number
To access the program revision number from the
default display, press the up or down keys until the
display reads F##, J## or I##. The two numbers
following the letter indicate the revision number. For
example, F12 indicates program F, revision twelve.
Operation