Install Instructions

33 | PIR Ready VT7600 Series-Installation Guide
Notes for Heat Pump models: When the outside air sensor is not connected or is
shorted, the Terminal Equipment Controller bypasses the heating / cooling lockouts and
the low / high balance points. Also Heat Pump model when set in Emergency system
mode bypasses heating lockout and permits auxiliary heating whenever a heating demand
occurs.
chngstpt
Changeover setpoint
Default value = 55 °F ( 13.0 °C )
In Cooling mode.
The outside air temperature value at which the cooling
will be switched over from mechanical ( compressor )
to free cooling ( economizer )
14 to 70 °F ( -10.0 to 21.0 °C )
Comf/eco
Comfort or economy
mode
Default value = Comfort
Sets the operation and interaction mode of the heat pump with
the auxiliary heat.
Comfort mode. In Heating mode.
If the heat pump is not able to satisfy the heating setpoint, the
auxiliary heat will be energized to satisfy the same heating
setpoint.
Economy mode. In Heating mode.
If the heat pump is not able to satisfy the heating setpoint, the
auxiliary heat will be energized to satisfy only when the
temperature has dropped 2.0 °F ( 1.1 °C ) below the heating
setpoint. Selecting economy mode will add a deadband
between the heatpump & auxiliary heat in heating mode. The
actual temperature maintained will be lower than the true
heating setpoint to maximize the heat pump operation.
When the outdoor air temperature drops below the low balance
point, the deadband will be eliminated and the auxiliary heat will
maintain the true heating setpoint alone.
Economy mode. In Emergency mode.
If Emergency heat mode is selected, the setpoint maintained,
will be the heating setpoint.
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
O OR B
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
Off or On