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321023
13.3
Refrigerant Precautions
To avoid risk of personal injury, do not allow refrigerant to contact eyes or skin.
To avoid risk of property damage, do not use refrigerant other than as shown on unit serial
NOTE: All precautionary measures recommended by refrigerant manufacturers and suppliers apply
and should be observed.
13.4
Line Piercing Valves
Line piercing valves can be used for diagnosis, but are not suitable for evacuating or charging due to
holes pierced in tubing by valves.
NOTE: Do not leave line piercing valves on system. Connection between valve and tubing is not
hermetically sealed. Leaks will occur.
13.5
Open Lines
During any processing of refrigeration system, never leave lines open to atmosphere. Open lines
allow water vapour to enter system, making proper evacuation more difficult.
13.6
Compressor Operational Test
(Short term testing only)
If compressor voltage, capacitor, overload, and motor winding tests are successful (do not indicate a
fault), perform the following test:
1.
Disconnect power to unit.
2.
Discharge capacitor by shorting capacitor terminals through a resistor.
NOTE: Not all units have run capacitor.
3.
Remove leads from compressor terminals.
4.
Attach test cord to compressor windings.
• Common lead on test cord attaches to C terminal on compressor.
• Start lead on test cord attaches to S terminal on compressor.
• Run lead on test cord attaches to M terminal on compressor.
5.
Connect a known good capacitor into circuit as shown above. For proper capacitor size and
rating, see technical data sheet for unit under test.
WARNING
CAUTION
number identification plate.
Attaching Capacitor for Compressor Test
94
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