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Customer Service

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HVAC Service Documents

Recommended Charging Procedure
Charge Determination
Basic Troubleshooting
R134a and PAG Oil Handling
Compressor Oil Handling
Compressor Troubleshooting
Blower Motor
Glossary of Common HVAC components

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



Gauge pressure is the first tool in AC troubleshooting. The table below shows 7 Gauge Readouts that you may encounter.

Use the Gauge Readout Tool separately or in combination with the
Table of Gauge Diagnostics for AC troubleshooting



Gauge Readout Tool



Normal Conditions:
1 Atmosphere
Room Temperatures of 30-38 C (86 - 96 F)
Engine speed of approx. 1500 rpm or about 75% of rated engine speed


Click on a Gauge set for troubleshooting tips.
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Perrin Manufacturing is committed to providing you with superior products and services; we renew this pledge through continual improvement of our products and motivation of our staff.

We faithfully comply with all of the requirements of our ISO 9001:2008 Quality Management System, the most current edition of the standard. Beyond that, our highly trained quality staff persistently search for new ways to improve the effectiveness of our system.
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