22
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 / 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.
Economizer Model only
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 )
min pos Minimum position
Default value = 0%
Outside air damper minimum position.
Will be active only when fan is on ( G terminal ) and the
internal or remote scheduling is in occupied mode.
When internal or remote scheduling is in unoccupied mode
and/or fan is off, minimum position will be set to 0%
0 to 100 % = 0 to 10 Vdc output range
C mech Mechanical cooling allowed
Default value = Off
In Cooling mode.
Allows the operation of the mechanical cooling if the free
cooling ( economizer ) cannot maintain the cooling setpoint.
Off Typically applies when the MS ( mixed air temperature
sensor ) is installed after the mechanical cooling refrigeration
coils. In this case, mechanical cooling will never operate at
the same time as free cooling.
On Typically applies when the MS ( mixed air temperature
sensor ) is installed before the mechanical cooling
refrigeration coils in the mixing plenum. In this case,
mechanical cooling is allowed when the free cooling (
economizer operation ) cannot maintain the cooling setpoint.
Off or On
mix stpt Mixed air setpoint
Default value = 55 °F ( 13.0 °C )
Free cooling mixed air setpoint when economizer mode is
enabled.
50 to 90 °F ( 10.0 to 32.0 °C )
MS dis Display mixed air temperature
Economizer model only, only if sensor
is installed
Used as diagnostic / service help to troubleshoot and
diagnose economizer operation.
Outside air
percentage
0% 5%
10% 15% 20%
25% 30%
Setting for 0-10
Vdc Actuator
0% 5%
10% 15% 20%
25% 30%
Setting for 2-10
Vdc Actuator
0 to
20%
24%
28% 32% 36%
40% 44%
(25 páginas)
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