17
039073 • V
ers
ion
1.
0 • 05
.03.
2007
How to service run-around heat exchangers
Intervals
Once annually.
Before start
The following must be available before service:
•
Compressed air or vacuum cleaner
•
a soft brush
Warning!
Do not forget to disconnect all current to the unit and the unit parts before service.
Take care not to damage the slats of the coils.
Illustration
The run-around heat exchanger:
Reduction of
capacity
After many hours of operation dust may settle on the coil surfaces. This can reduce the
recovery capacity, and preventive maintenance is consequently important.
Procedure
Do as follows to service the run-around heat exchanger:
Step
Action
1
Check the coils for dust or dirt. If necessary, clean the alu slats by a soft
brush and a vacuum cleaner.
Alternatively you may blow compressed air through the coil against the
normal air direction
2
Straighten any bent slats using appropriate tools
3
Air the coil circuits through the exhaust valve of the pipe system (air in the
pipe system may reduce the capacity)
4
Service the pump according to the pump manufacturer’s directions
5
Check the positive pressure of the pressure expansion system. If necessary,
pump it to the correct level
Continued overleaf
