Outside Air Temperature Frost Protection
If the filtered outside air temperature drops below the value of the parameter OAT-03:
- The heating pump will run continuously
- Total cool-down will occur only if a room temperature sensor is available
- Without room temperature sensor there is no total cool-down any more. The mixed water temperature will be controlled with night setback with the mixed water temperature setpoint according to the heating curve with the lower (un-occupancy) room temperature setpoint in this case.
If the filtered outside air temperature gets higher than the parameter OAT-03 plus a fixed differential of 1K, the outside air temperature frost protection will stop.
Table 15. Parameter List
Description
|
Value Range
|
Default Value
|
Unit
|
OAT-03: low limit frost protection
|
-50…150
|
6
|
°C
|