Stulz C7000 - Page 93

93 © STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR A/C UNITS
Dehumidification
There are four ways of realizing a dehumidification:
1. by reducing the fan speed and CW valve operation, this is the only way of dehumidification for CW-units.
2. by reducing the fan speed and compressor operation.
3. by the electronic expansion valve (only in CyberAir 2/3 units)
4. by shutting down a part of the evaporator via a solenoid valve. (not for CyberAir 2/3 units)
The choice of the dehumidification type is made by the controller according to the following conditions: The
priority lies on reducing the fan speed. This is the case for ACW/GCW/GE-units in mixed operation. Only if the
compressor is actually in operation and if a dehumidification valve is present, the 4th way of dehumidification
is chosen. The two dehumidifying ways are never applicated simultaneously.
If no dehumidification valve is present as in units of the series CyberAir 2/3, dehumidification is carried out by
the electronic expansion valve. If this is insufficient, the fan speed is reduced additionally after a time delay.
In A/C units with two refrigerant circuits only one compressor is used for the dehumidification.