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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

R134a and PAG Oil Handling Practices

Wear eye and hand protection when working with A/C system.
The A/C is under high pressure whenever refrigerant is in the system. Take necessary precautions when servicing any systems under pressure. Do not release R-134a into the atmosphere
Use gloves when charging a system. Coolant can cause freezing of body tissue.
Never introduce compressed air or oxygen to any refrigerant container or component. R-134a A/C system in the presence of air or oxygen above atmospheric pressure may form a combustible material.
Use approved R134a recovery-charging equipment including weight scale and vacuum pump. Non-use of one or both will reduce capacity of system, or cause component failure in the system.
Use only approved heating devices with calibrated weight scale when charging.
Use only approved heating device when working with R134a.

DO NOT STORE OR HEAT REFRIGERANT CONTAINER AND EQUIPMENT ABOVE TEMPERATURES OF 125 DEGREES FAHRENHEIT (52 C)
Do not mix R134a with any other refrigerants. If refrigerants are mixed failure is likely to occur.
The specified R-134a lubricant will adsorb moisture from the atmosphere at an extremely rapid rate.

DO NOT LEAVE PAG BOTTLES OPEN TO THE ATMOSPHERE.
Keep PAG oil lubricant in metal cans, not plastic.

For our Seltec brand compressors the only warrantable oil allowed is PAG oil ZXL100 PG (DH-PS). Your compressor comes charged with 5-7 oz. of PAG oil. Consult compressor manufacturer for any additional oil charge necessary with new system installations, as this may be necessary.

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

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