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WA900-3EO
COMPONENT MAINTENANCE
9. THERMAL EXPANSION VALVE
This valve is factory set to provide the correct balance of pressure
and temperature at the evaporator.
Service on this valve is limited to the removal and cleaning of the
wire gauze filter at the valve inlet.
To remove the filter proceed as follows -
1.
Shut off line valve upstream of TX valve.
2.
Run compressor and pump down evaporator coil and suction
line.
3.
Close compressor suction service valve.
4.
Remove the lagging compound from around the valve.
5.
Remove the valve assembly from the refrigeration system.
6.
Using a sharp instrument carefully prise out the conical
shaped strainer from the inlet port.
Note: Care must be taken not to tear the wire gauze.
7.
Carefully wash the gauze in a suitable solvent.
8.
Installation is a reversal of the above procedure.
9.
Ensure line and service valves are reopened once complete.
WARNING: If the filter blockage is due to a
concentration of small white balls it is possible that the
desiccant has become dislodged within the receiver
drier.
If this is the case, the entire system will have to be
flushed out and a new receiver drier installed.
10. COMPRESSOR
For compressor service refer to relevant manufactures service
manuals.
11. RETURN AIR FILTER
The return air filter should be removed and washed as required,
under cleaned running water, as noted on the Maintenance Schedule
Chart.
OPERATING INSTRUCTIONS
