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Preventive maintenance,
Cooling circuit
Inspection
18
continued
The cooling circuit should only be serviced by trained cooling technicians.
The following steps is mandatory:
Step
1
Check for any leakages in all junctions, with a suitable leakage detector foam.
2
Check the HP switch functionality.
A. After re-assembly, power on the unit, without the internal service cover.
B.
Cover the outside air inlet going to the condenser, with a piece of plastic
foil, covering the inlet completely
C. Measure the DC voltage on the two wires from the condenser temperature
sensor, connected to the PCB board. See electrical schematics at page 21
D. Expect compressor shutdown within a reasonable time (max 10 min), and
at approximately 0,88 Volt DC.
E.
If so the HP safety switch is working, and the refrigerant amount is most
likely to be adequate.
The unit must be inspected prior to any reassemble and put back into service.
Please follow below steps:
Phase
1
Are the fans clean and free of any corrosion?
2
Are the coolant pipes free of obstructions, damage, corrosion and show no
obvious signs of leakage?
3
Are the coil lamellas clean and undamaged?
4
Are all fan blades free of any obstructions, cracks or missing blades?
5
When rotating the fans with the fingers, do the fans rotate freely, without vi-
brations and noise?
6
Is all wiring and insulation undamaged?
7
Are all connectors secured properly and in good conditions?
Action
Description
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