34
Preventive maintenance,
continued
Recommended
approach
The recommended approach when performing a preventive maintenance visit is:
Step
Action
1
Make sure that the power to the unit is safely switched of
2
Clean the unit carefully:
•
Air ducts
•
Fans
•
Filters
•
Condenser
•
Evaporator
3
Perform the tasks using the checklist below
4
Switch on the power again
5
Connect the power
Result: The test program runs through all functions.
Check that the unit does not come out with an alarm signal.
In case of an alarm signal, please see section “Fault finding guide”, page 71
Tasks
The following must be checked when performing the preventive maintenance visit:
Item
Yes
No
Are the fans and the compressor clean and free of corrosion?
Is the fan and compressor mounted securely and free of excessive
vibration?
Is the compressor free of excessive noise?
Are the coolant pipes free of obstructions, damage, corrosion and show
no obvious signs of leakage?
Are the lamellas on the condenser and the evaporator clean and
damage free?
Are all fan blades free of obstruction, cracks, missing blades and in
balance?
Do the fans rotate freely and are they free from excessive vibration or
noise?
Is all wiring and insulation free of damage?
Are all connectors sealed properly and in good condition?
