EN/10.2021/i04 © STULZ S.p.A. – all rights reserved
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
6.6. Calibration of automatic bypass
The automatic by-pass (BPA) is located on the right side of the chiller, and is accessible by
removing the right panel.
The factory setting of the by-pass is for operation with pumps 50 Hz.
INFoRmATIoN
For the correct operation with a
power supply frequency of 60 Hz it is
necessary to change the calibration of
the automatic by-pass according to the
following table.
Cap
Calibration screw
To calibrate the bypass:
•
Remove the right side panel of the chiller
•
Close the valves on the external flow pipe
•
Activate the pump and on the pressure gauge display
the working point
•
Remove the top cap of the valve by-pass
•
With chiller operating and the pump turned on, act on
the calibration screw until bringing the pump within the
range of correct operation
•
Replace the top cap
•
Open the taps on the external flow pipe.
Below the setting values of the automatic by-pass recommended by the manufacturer:
WLA02
WLA03
WLA05
50 Hz
60 Hz
50 Hz
60 Hz
50 Hz
60 Hz
Standard pump [bar]
2,6
3,3
2,5
3,2
3,7
4,8
Medium pressure pump [bar]
4,2
5,8
4,1
5,8
5,0
6,8
WLA08
WLA10
WLA13
50 Hz
60 Hz
50 Hz
60 Hz
50 Hz
60 Hz
Standard pump [bar]
3,7
4,8
3,5
4,5
3,5
4,5
Medium pressure pump [bar]
5,0
6,8
4,5
6,0
4,5
6,0
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