Plant diagram
Figure: 2-pipe system fan coil applications with active chilled beam
Key:
DXR2… | Automation station |
| R1 | Room operator unit |
Q1 | Fan |
| D1 | Presence |
YC | Chilled water cooling coils (active chilled beam) |
| D2 | Window contact |
Sequences
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| |||
Y | Output signal |
| TR | Room temperature |
SpH | Effective heating setpoint |
| SpC | Effective cooling setpoint |
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| YC | Cooling valve |
Figure: Modulating cooling sequence
Dew point temperature
monitoring
As a supplement to the condensation monitor, the primary chilled water temperature is compared against the present dew point temperature in the room. The chilled beam valve is closed if the chilled water temperature drops below the dew point temperature at a previously configured difference. The chilled beam valve is once again released if the chilled water temperature exceeds the dew point temperature, with consideration of a configurable difference and a dead zone.
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HysTDiffDwpChw | Hysteresis for minimum difference dew point temperature/chilled water temperature |
| TDiffDwpChwMin | Minimum difference dew point temperature/chilled water temperature |
TChwPm | Chilled water temperature primary |
| TDwp | Dew point temperature (calculated) |
Figure: Dew point temperature monitoring parameters
Dew point temperature monitoring must be enabled.
Description | Name | Default value |
|---|---|---|
Enable dew point temperature 0:No | EnTDwp | 0:No |