Plant diagram
Figure: 2-stage heat pump with reversing valve control and hot gas reheater
Key:
DXR2… | Automation station |
| Q1 | Fan |
D1 | Presence |
| R1 | Room operator unit |
D2 | Window contact |
| YR | Electric reheater |
HP | Heat pump |
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Sequences
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Y | Output signal heat pump |
| TR | Room temperature |
SpH | Effective heating setpoint |
| SpC | Effective cooling setpoint |
YH | Heat pump heating |
| YC | Heat pump cooling |
YH1 | Heat pump heating, first stage |
| YC1 | Heat pump cooling, second stage |
YH2 | Heat pump heating, second stage |
| YC2 | Heat pump cooling, second stage |
YRV | Reversing valve heat pump |
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Figure: 2-stage heating and cooling sequence with reversing valve