HFC134a Service Information
Replacement Service Compressor
HFC134a service compressors will be charged with ester oil and pressurized with dry nitrogen. Before replacement compressor is installed, pull out 1 rubber plug. A pop from pressure release should be heard. If a pop sound is not heard, do not use compressor. Positive pressure in compressor is vital to keep moisture out of ester oil. Do not leave compressor open to atmosphere for more than 10 minutes.
Compressor Testing Procedures
•Refer to “Temperature and Relationship Chart”for operating watts, test points, and temperature relationship test.
•Temperature testing is accomplished by using 3 lead thermocouple temperature tester in specific locations. Test point
•Thermocouple tips should be attached securely to specified locations.
•Do not test during initial pull down. Allow one off cycle or balanced temperature condition to occur before proceeding with testing.
•Refrigerator must operate minimum of 20 minutes after thermocouples are installed.
•Turn control to colder to obtain required on time.
•Wattage reading must be recorded in conjunction with temperature test to confirm proper operation.
•Suction and head pressures are listed on “Temperature and Relationship Chart”Normally these are not required for diagnosis but used for confirmation on systems which have been opened.
Refrigerant Charge
Refrigerant charge in all capillary tube systems is critical and exact amount is required for proper performance. Factory charges are shown on serial plate. Do not use refrigerant other than shown on serial plate.
Leak Testing
Undetected leaks lead to repeated service calls and eventually result in system contaminations, restrictions, and burned out compressors.
After recharging, sealed system must be thoroughly tested for leaks. If a very small leak is difficult to isolate, coat area with soap suds and observe location of bubbles.
WARNING
To avoid death or severe personal injury, never use oxygen, air or acetylene for pressure testing or cleanout of refrigeration system. Use of oxygen, air, or acetylene may result in violent explosion. Oxygen may explode on contact with oil and acetylene will spontaneously explode when under pressure.
Evacuation and Charging
Thermistor | Low Side Gauge | High Side Gauge | ||||
Vacuum Gauge |
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| E |
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| Valve | Drier/Process Tube | |||
| Valve |
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| C | Charging Hose | ||
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Compressor | Charging Hose |
| B |
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| Compressor |
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| Process |
| A |
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| Tube |
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.6 cm Copper 
Tubing 
F
Valve
Vacuum Pump
Charging
Cylinder
November 1996 | 15 | RS1200001 |
