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Leak Testing
After all connections are complete the refrigeration system must be tested for leaks.
Failure to perform a leak test can result in unsatisfactory system performance,
additional servicing and service costs, and possible system failure. Leak test should be
performed using an electronic leak detector. All joints and components, both factory
and field installed, should be thoroughly inspected for leaks. The system installation
must be leak free!
Leak Testing “PR” model systems:
Open both the liquid and suction service valves.
Ensure the solenoid valve is energized and open.
Add 50 psi refrigerant, then pressurize with dry nitrogen to the low side test
pressure identified on the unit rating label.
Allow thirty minutes for refrigerant to reach all parts of the system.
Check all joints and components with an electronic leak detector.
Leak Testing “PC” model systems:
Leave the service valves closed, the condensing unit is charged with refrigerant.
Ensure the solenoid valve is energized and open.
Add 50 psi refrigerant, then pressurize with dry nitrogen to the low side test
pressure identified on the unit rating label.
Allow thirty minutes for refrigerant to reach all parts of the system.
Check all joints and components with an electronic leak detector.
Leak Testing “PCL” model systems:
Open both the liquid and suction service valves.
Ensure the solenoid valve is energized and open.
Allow thirty minutes for refrigerant to reach all parts of the system.
Check all joints and components with an electronic leak detector.
If a leak is detected, relieve the pressure and/or reclaim the refrigerant and repair the
leak. If additional brazing is required, pass a dry inert gas (nitrogen) through the system
to prevent contamination. Reference page 10 of this manual for leaks located at quick
connects couplings. Retest the system as outlined above until no leaks are detected.
CAUTION
If a braze joint is detected leaking, dry inert gas must be passed through the system
while repairing the joint to prevent scaling and oxidation. Scaling and oxides can clog
refrigeration components resulting in system failure.
CAUTION
Always use the system specified refrigerant when pressuring to perform a leak test.
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