7
Installer setup (ISU)
ISU Setup Number and Description Options (factory default in bold)
125 = Temperature Indication Scale
0 = Fahrenheit
1 = Celsius
200 = Heating System Type
1 = Conventional Forced Air Heat
2 = Heat Pump
3 = Radiant Heat
5 = None (Cool Only)
Notes:
• Default varies based on model.
• This option selects the basic system type your thermostat will
control.
205 = Heating Equipment Type
Conventional Forced Air Heat:
1 = Standard Efficiency Gas Forced Air
2 = High Efficiency Gas Forced Air
3 = Oil Forced Air
4 = Electric Forced Air
5 = Hot Water Fan Coil
Heat Pump:
Note: ISU 205 is not shown when ISU 200 is set for heat pump.
Radiant Heat:
9 = Hot Water Radiant Heat
12 = Steam
Note: This option selects the equipment type your thermostat will
control. This feature is NOT displayed if feature 200 is set to Cool Only.
218 = Reversing Valve O/B
0 = O (O/B in Cool)
1 = B (O/B in Heat)
Note: This option is only displayed if the Heat Pump is configured. Select
whether reversing valve O/B should energize in cool or in heat.
220 = Cool Stages / Compressor Stages
(200=Conv / 200=HP)
0, 1
Note: Select how many Cool or Compressor stages of your equipment
the thermostat will control. Set value to 0 if you do not have Cool Stage/
Compressor Stage.
221 = Heat Stages / Backup Heat Stages
Heat Stages: 1
Backup Heat Stages: 0, 1
Note: Select how many Heat or Aux/E stages of your equipment the
thermostat will control.
230 = Fan Control in Heat
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: This ISU is only displayed if ISU 205 is set to Electric Forced Air or
Fan Coil.
300 = System Changeover
0 = Manual
1 = Automatic
Note: Thermostat can automatically control both heating and cooling
to maintain the desired indoor temperature. To be able to select
“automatic” system mode on thermostat home screen, turn this feature
ON. Turn OFF if you want to control heating or cooling manually.
Continued on next page.
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