Plant diagram
Figure: Example of water register 4-pipe system with changeover valves
Key:
DXR2… | Automation station |
| R1 | Room operator unit |
YH | Heating valve |
| D1 | Presence |
YA | Changeover valve heating |
| D2 | Window contact |
YC | Cooling valve |
| YS | Supply air VAV |
Sequences
| ||||
Y | Output signal |
| TR | Room temperature |
SpH | Effective heating setpoint |
| SpC | Effective cooling setpoint |
YH | Heating valve |
| YC | Cooling valve |
YA | Changeover valve heating |
| YB | Changeover valve cooling |
Figure: Modulating heating and cooling sequence