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028-0323-02_LIT-VZ7656R&VZ7656H_W-E01_EN
September 2019
Low BP
Low balance point
Default value =
-40 °F ( -
40 °C )
Function will only be
enabled if OS (outside air
temperature sensor) is
connected.
In
Heating, Cooling or Auto mode
, it is the outside air
temperature value at which the heat pump operation will be cut
off. Below that value, only the auxiliary heat will be used to
maintain the heating setpoint
-40 to 30 °F ( -40 to -1.0 °C )
Re valve
Reversing valve operation
O/B
Default value =
O
Heat pump reversing valve operation
O
will energize the valve in cooling operation.
B
will energize the valve in heating operation.
Comp/aux
Compressor/auxiliary
interlock
Default value =
Off
Sets the operation and interaction mode of the heat pump with
the auxiliary heat.
Interlock Off
. In
Heating mode.
If the heat pump is not able to satisfy the heating setpoint, the
auxiliary heat will be energized at the same time as the heat
pump stage. Typically applies when the air handler heat pump
coil is installed before the auxiliary heat. ( all electric systems )
Interlock On
. In
Heating mode.
If the heat pump is not able to satisfy the heating setpoint, the
auxiliary heat will be energized and the heat pump will be cut
off. Typically applies when the air handler heat pump coil is
installed after the auxiliary heat. ( add on systems ) There is a 2
minute delay to restart the heat pump, when the auxiliary heat
is shut down.
