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Heat Pump Heating Lockout
On Heat Pump systems, the user will be able to select a Heat Pump Heating Lockout Setpoint to
determine a low outside air temperature limit for heat pump heating operation.
There is no enable/disable switch for this function. By default, the Heat Pump Heating Lockout Setpoint
will be set to -40F, which essentially disables this function. If a user wants to take advantage of this
feature, the recommendation will be to raise the Heat Pump Heating Lockout Setpoint to an appropriate
lockout point for the application.
The function operates as follows:
When the Outdoor Air Temperature Active ≤ Heat Pump Heating Lockout Setpoint –
Active:
Compressor outputs for heating will be disabled after the minimum ON time has expired. Auxiliary
Heating, if configured, will be used to satisfy a heating demand.
If compressors were not ON before this function became active, compressors will be prevented from
operating for heating operation.
Auxiliary Heating, if configured, will be used to satisfy a heating demand
When the Outdoor Air Temperature Active > Heat Pump Heating Lockout Setpoint –
Active + 5F:
Compressor Outputs for heating will be re-enabled for heating operation
Auxiliary Heating, if configured, will be allowed to de-energize or remain energized in order to satisfy the
current heating demand.
When the Outdoor Air Temperature Active point is in Alarm:
The Heat Pump Heating Lockout function will be disabled.
Compressor Outputs, if available, will be used to satisfy heating demands.
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