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HVAC Service Documents

Gauge Diagnostics

Using Gauges for Troubleshooting
Air in cooling system (insufficient suction)
Defective expansion valve
Excessive refrigerant
Insufficient compressor operation
Insufficient refrigerant
Moisture Intrusion
Refrigerant does not circulate

Summary Table of Gauge Diagnostics

Compressor Oil Handling Practices

A Certain amount of oil will remain coated to the walls of hoses, condenser, inside dryers, and inside the evaporator core. When servicing, if a component is removed and replaced with a new part the following chart is used in addition to the oil the charging station recovered during the refrigerant recovery.

COMPONENT	ADD OIL (CM3)	ADD OIL (OZ.)
EVAPORATOR	50	1.69
CONDENSER	30	1.01
RECEIVER DRYER	10	.34
HOSE (PIPING)	10 PER HOSE	.34 PER HOSE

**Add recommended amount of oil + recovered oil.

Information obtained in ZEXEL Service Manual
Basic service procedures for R134a Air Conditioning Systems.
Copyright 1992

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