High Fire | Low Fire | High Fire |
Adjustment | Adjustment | Terminal |
3. Send the Unit to Low Fire
Disconnect and isolate the wire from the high fire terminal to send the unit to low fire.
4. Check the Low Fire Manifold Pressure
Measure each valve’s low fire manifold pressure.
The recommended low fire manifold pressure is 7/8 in. wg for natural gas and
If needed, use the low fire adjustment screw on each staged gas valve to properly set both low manifold settings. Counterclockwise rotation will decrease the gas pressure and clockwise rotation will increase the gas pressure.
When the low fire manifold pressure is properly set, reattach the disconnected
wire to the high fire
terminal, allow the heat Natural Gas LP switch to close
or remove the | Low Fire | 7/8 | ||
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High Fire | 10 | |||
jumper. | ||||
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warning
Once the high and low fire have been set, be sure the press the Function key to end high fire mode. The middle LED light, L2, will stop flashing when high fire mode is off.
Note
Step
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 setpoints menu without saving the change.
5. Access the Setpoints Menu
Press and hold the Function key for three seconds to access the Setpoints Menu. The display will read “SEt.”
6.Access the Discharge Air Temperature Setting
Using the Up or Down key, scroll through the Setpoints Menu until the
display reads “dtS”, then press the Enter key. The display will change to the discharge air temperature setting.
7. Edit the Setting
Use the Up or Down key to change the discharge air temperature setting. When the correct setting is displayed, press the Enter key to save the setting and return to the Setpoints Menu.
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.
8. Access the Inlet Air Sensor Setting
From the Setpoints 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.
9. Edit the Setting
Use the Up or Down key to change the inlet air setting. When the correct setting is displayed, press the Enter key to save the setting and return to the Setpoints Menu.
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 Setpoints Menu without saving the change.
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.
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Model IG / IGX
