Plant diagram
Figure: 4-pipe system fan coil applications
Key:
DXR2… | Automation station |
| R1 | Room operator unit |
Q1 | Fan |
| D1 | Presence |
YC | Chilled water cooling coils |
| D2 | Window contact |
YH | Hot water heating coils |
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Sequences
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Y | Output signal |
| TR | Room temperature |
SpH | Effective heating setpoint |
| SpC | Effective cooling setpoint |
YH | Heating valve |
| YC | Cooling valve |
Figure: Modulating heating and cooling sequence