EN/
0915/WLA Compact
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4.
Description
4.1.
Layout of the components, principle and mode operation.
Only chiller
The chillers described in this manual consist of:
•
hermetic refrigerant circuit, filled with R134a refrigerant. The refrigerant circuit includes a rotary vane
compressor, condenser, an electronic thermostatic valve, and stainless steel evaporator as brazed plate heat
exchanger;
•
hydraulic circuit;
•
condensation module consisting of a condenser and a fan.
The chiller is controlled from the Dixell XW05K electronic regulator (designed and produced according to STULZ
specification) and from a main switch placed on the side of the electronic regulator on the chiller front panel. The
electrical panel, with protection rate IP44, can be accessed from the upper part of the unit and contains all the
electrical control components of the chiller already wired. The holes for the passage of power supply cables are
located on the rear side of the unit and are provided with cable gland sheaths.
The compressor is fixed to the base and it is found in the left rear side of the chiller (accessible by removing the left
side panel).
The condenser, with intake fan integrated, is located in the left side of the chiller and it can be accessed from the left
panel and from the front side, prior removal of the specific panels.
The evaporator as brazed plate heat exchanger is placed at the centre of the unit and it can be accessed by
removing the front panel.
The condenser cooling air is suctioned from the front side and discharged on the rear upwards by means of the
specific grid in the closing panels.
The inlet and outlet water fittings are located on the rear right, whereas additional hydronic components (circulation
pump and storage tank) are found on the chiller right side.
4.2. Refrigerant diagrams
Key
Name, symbol
Meaning
Name, symbol
Meaning
BC
Condenser
MT
Electric motor
CO
Compressor
PP
Capacity control pressure switch
EV
Evaporator
PV
Fan capacity control
FA
Condenser air filter
S
Temperature probe
FG
Refrigerant filter
SC1/SC2
Electronic controller
HP
High pressure switch
SG
Solenoid valve
LD
Gas injector
VT
Thermostatic valve