8
INNOV@-pCO1-IOM-0907-E
2.2.3 Close control units with water coils
In these close control units, the cold water coils provide for dehumidification. For any information about their
operation, refer to the previous paragraph. The following diagrams show the dehumidification devices action.
The percentage values indicate the modulating valves opening range. Please note that the dehumidification
cold water coils are enabled at 100%, not in modulating mode, in case of both threeposition and 0-10Volt
valves.
Humidity
set
40.0 48.0 50.0 52.0 60.0
Ambient
2.0%
2.0%
humidity (%)
Humid. band Dehumid. band
10.0%
10.0%
Low humidity alarm
High humidity alarm
2.3 Recovery coil
Recovery is an optional function: an additional cold coil using water coming from an external source (i.e.,
evaporation tower) is enabled if the temperature of water running inside it is quite low. This allows saving on
the system management costs. The coil is enabled by On-Off contact or 0-10Volt modulating signal.
The following diagram shows the recovery coil enabling conditions: environment cooling request and
recovery water temperature lower than recovery set
–
recovery differential.
Temperature set
COOLING REQUEST
0%
23.0 23.5 26.5
Ambient
0.5°C 3°C
temp.(°C)
Dead z. Cold prop. band
Recovery set
RECOVERY ENABLED
10.0 12.0
Recovery
2°C
temp.(°C)
Recovery differential
OFF ON OFF
Recovery
coil state