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Access 4.x |
Reversible heat pump configuration example |
The air handling unit section with heat pump is a separate section, containing a fully integrated, complete standalone reversible heat pump system (heating and cooling). All refrigerant system components are fully integrated into the unit. The refrigerant is evaporated and condensed directly in the integrated coils, and the capacity is controlled automatically and steeples between 5 and 100 %.
The table below shows a configuration example of the single stage Reversible Heat pump.
Variable |
Available options & Selection |
Note |
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Sequence selection |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup |
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Sequence for heating |
|...| SEQ-G Heating 2 | SEQ-H |...| |
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Sequence for cooling |
|...| SEQ-G | SEQ-H Cooling 2 |... | |
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Sequence settings |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup > Heating 2 |
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Type of sequence |
|...| Heating |...| |
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Type of heater |
| Water | Electric| DX | Combi coil | |
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Type of feedback |
| None | Alarm | Run indication | |
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Digital start output |
| No | Yes | |
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Sequence output when recirculation/support |
| 0% | 100% | Auto | |
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Sequence output min limit |
0% |
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Sequence output max limit |
100% |
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Sequence output when the unit is stopped |
0% |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup > Cooling 2 |
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Type of sequence |
|Cooling |...| |
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Type of cooler |
| Water | DX | DX with exchanger control | |
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Type of feedback |
| None | Alarm | Run indication | |
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Digital start output |
| No | Yes | |
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Sequence output when recirculation/support |
| 0% | 100% | Auto | |
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Sequence output min limit |
0% |
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Sequence output max limit |
100% |
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Sequence output when the unit is stopped |
0% |
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Changeover settings |
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Configuration > Functions > Function activation > Heating/Cooling sequence setup > Changeover settings |
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Changeover 1 |
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Changeover sequence for heating |
… | Heating 2 | … |
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Changeover sequence for cooling |
… | Cooling 2 | … |
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Changeover 2 |
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Changeover sequence for heating |
… | Disabled | … |
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Changeover sequence for cooling |
… | Disabled | … |
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PID Settings |
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Configuration > PID controllers > Heating 2 |
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P-band |
10 oC |
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I-time |
100 s |
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D-time |
0 s |
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Configuration > PID controllers > Cooling 2 |
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P-band |
10 oC |
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I-time |
100 s |
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D-time |
0 s |
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Hardwired interface to the pump & valve |
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Configuration > I/O allocation settings > |
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Digital inputs > Feedback cooling 2 (SEQ-H) |
Any available I/O |
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Digital inputs > Lock PID controller supply |
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Digital outputs > Cooling 2 start (SEQ-H) |
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Digital outputs > Changeover 1 |
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Analog outputs > Changeover 1 |
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Heater starting and stopping |
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Data & Settings > Temperature control > Heating 2 |
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Digital start output start point |
10% |
Output of the supply controller to start and stop the heater |
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Digital start output stop point |
1% |
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Cooling control settings |
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Data & Settings > Temperature control > Cooling |
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Digital start output start point |
10% |
Output of the supply controller to start and stop the DX cooler |
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Digital start output stop point |
1% |
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Block DX-cooling if outdoor temperature < |
0 oC |
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Block DX-cooling if supply air fan output signal < |
0% |
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Hysteresis if outdoor temperature block |
1 oC |
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Reduction of min limit supply air is active DX-cooling |
5 oC |
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Graphical representation |
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Flowchart |
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37% - indicates the output of either Heating 2 sequence or Cooling 2 sequence (depending if there is a demand for heating or cooling) |
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