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System Menu

The SYSTEM menu is used to set up the thermostat for the correct HVAC system type. The following

setup opons will be displayed in the text line:

• HVAC System Type: Standard Gas/Electric or Heat Pump

• Fan Type: Gas Heang or Electric Heang

• Changeover Valve Type (for Heat Pump Systems): Changeover with Cooling or with Heang.

To select opons:

• Use the  buons to scroll to the desired seng.

• Press SELECT to change a seng. The current seng for that selecon will be ashing.

• Change the opon with the  buons.

• When the desired opon has been selected, Press SELECT again to save it.

• Then press DONE to exit.

System Type

• For Standard Gas/Electric systems, select STANDARD. This is the default seng.

• For Heat Pump systems, press the  buons to change to HEAT PUMP

• Press SELECT to set.

• Press DONE to exit.

Fan Type (For Standard HVAC systems only)

Fan type depends on the heang system type.

• For Gas heat: select GAS. This is the default seng.

• For Electric heat: press the  buons to change to ELECTRIC.

• Press SELECT to set.

• Press DONE to exit.

Changeover Type (For Heat Pump HVAC Systems Only)

The changeover (or reversing) valve is used to change from heang to cooling operaon. The HVAC

system is either a Changeover with Cooling type (O) or Changeover with Heang type (B). Most are

changeover with cooling, which is the default seng.

• For Changeover with Cooling systems, select WITH COOL. This is the default seng.

• For Changeover with Heang systems, use the  buons to change to WITH HEAT.

• Press Select to set.

• Press Done to exit.

Not sure what type Changeover system? Check the exisng thermostat connecons to help

determine this. If the original system had an orange wire connected to an “O” terminal, then this is a

“changeover with cool” system. If there was a brown wire connected to a “B” terminal, then this is a

“change over with heat” system. Set the Changeover seng accordingly.

NOTE: If heating comes on when cooling is expected or vice versa, switch the

“Changeover Type” to the opposite setting.

NuTone NTBZ48 User Manual

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