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Leak Testing "PC" model systems
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Leave the service valves closed, the condensing unit is charged with refrigerant.
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Ensure the solenoid valve is energized and open.
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Add 50 psi refrigerant, then pressurize with dry nitrogen to the low side test pressure identified on the unit rating
label.
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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.
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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.
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Reference page 12 of this manual for leaks located at quick connects couplings.
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Retest the system as outlined above until no leaks are detected.
•
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.
Always use the system specified refrigerant when pressuring to perform a leak test.
System Evacuation
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Evacuation of the refrigeration system is necessary to remove all air and moisture from the system.
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A reliable rotary vacuum pump with an accurate deep vacuum gauge is recommended.
•
Do not use the system compressor as a vacuum pump and do not operate the compressor while the system is under
vacuum.
Evacuation of "PR" model systems
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Open both the liquid and suction service valves.
•
Ensure the solenoid valve is energized and open.
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Connect vacuum pump to the liquid and suction service valves located on the condensing unit.
Evacuate the system to 250 microns and maintain for a minimum of 4 hours.
•
Perform a vacuum decay test for a minimum of ten minutes to ensure the system is leak free and dry.
•
Evacuation of "PC" model systems
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Leave the service valves closed, the condensing unit has been evacuated and is charged with refrigerant.
•
Ensure the solenoid valve is energized and open.
•
Connect vacuum pump to the liquid and suction service valves. located on the condensing unit.
•
Evacuate the system to 250 microns and maintain for a minimum of 4 hours.
•
Perform a vacuum decay test for a minimum of ten minutes to ensure the system is leak free and dry.
CAUTION
CAUTION
13
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