EN/10.2021/i04 © STULZ S.p.A. – all rights reserved
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
5.4.5 Expansion valve
It’s mechanical type, based on pressure and temperature in base exiting from the evaporator
(compressor suction), adapts the refrigerant capacity to the evaporator. The adjustments for the
correct working are made by the manufacturer and cannot be altered afterwards.
5.5.
Safety components of the refrigerant circuit
5.5.1 High pressure switch
A high pressure switch is installed on the refrigerant circuit and it triggers when the pressure inside
the refrigerant circuit exceeds 25 barg. The circuit compressor is deactivated and an alarm signal
appears on the electronic controller display. The alarm conditions stops when the pressure drops
below 17 barg.
5.6.
protection components of the refrigerant circuit
5.6.1
Refrigerant filter
A chiller filter is located in the liquid line of each refrigerant circuit. This filter holds the humidity
particles in the chiller.
5.6.2 Evaporator antifreeze protection device
The antifreeze protection device prevents the evaporator from freezing.
An evaporator outlet probe placed on the water circuit measures the temperature of the cooled
liquid. If this reaches values equal to or lower than the alarm threshold, the control disables the
cooling mode.
5.7.
Components of the hydraulic circuit
5.7.1 Chiller
The standard hydraulic circuit includes an evaporator, two water probes, one on the inlet and the
other one on the outlet of the heat exchanger, a pressure gauge, a non-pressurised storage tank,
a pump and a protection flow switch.
The refrigerated water pipes are made of polyurethane and are equipped with quick coupling
connections. The chiller can be supplied in the following versions:
•
Evap Tank + centrifugal pump with standard prevalence.
•
Evap centrifugal pump with standard prevalence.
•
Only evaporator, standard version.
Moreover, the following options are available and can be installed inside the chiller:
•
Medium head centrifugal pumps.
•
Non-ferrous crankcase and anti-freeze heater
5.7.2
Low temperature fluid up to -5°C
Optional. For more information, please refer to paragraph 12.2.
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