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© STULZ GmbH – all rights reserved EN/02.2018/G17F
cyberlab original instructions
3.2 Intended use
This A/C unit is used to control room temperature and air humidity within the application limits stated
in chapter 4.1. The A/C unit is designed for indoor installation. The A/C unit complies with the hygi-
enic requirements according to VDI6022. The unit is also designed for zero-load operation. Any use
beyond this is not deemed to be use as intended.
3.3 Function of the A/C unit
The A/C unit is exclusively operated by the controller in the
front panel and the main switch (operable from outside the
unit) in the electric box.
In the air inlet a temperature/humidity sensor is located which
provides the measured values for the temperature/humidity
control. Cooling is achieved by compressor operation in the
refrigerant circuit.
The unit has an incorporated electric reheat and a hotgas
reheat, to precisely control the temperature in case of a small
thermal load.
To achieve a dehumidification, the electronic expansion
valve is partially closed in the first step. The reduction of the
refrigerant mass flow makes the evaporation temperature
drop, which lets the surface temperature in a part of the
evaporator fall below the dew point of the air. This causes
dehumidification.
For a bigger dehumidification, the fan speed is reduced. With
a constant cooling capacity, the temperature of the air which
flows through the heat exchanger coil, passes below the dew
point. The moisture contained in the air condenses on the
heat exchanger gathers in the condensate pan and is carried
away by the drain.
An external humidifier can optionally be connected and is
powered and controlled by a power and control line coming
from the CyberLab unit.
The A/C unit control is effected by the on board I/O control-
ler. The operational conception is designed such as to allow
to control up to 19 units from one unit. These units can be
installed separately with a maximum control line length of
1000 m.
Electrical
box
Electrical
reheat
Hotgas reheat
Sight glass
Filter dryer