Viconics VT7600 Installation Guide (First Release 1000 Series) - Manual (Page 19)

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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
Notes for Heat Pump models:
When the outside air sensor is not connected or is shorted, the thermostat bypasses:
• The heating lockout
• The cooling lockout
• The low balance point
• The high balance point
Heat Pump model when set in Emergency mode bypasses heating lockout and permits auxiliary heating whenever
a heating demand occurs.