Piping
Liebert
®
SRC
™
User Manual 66
5.5 Air Purging
Air purging is performed after all piping is connected between the indoor and the outdoor unit. This step is
necessary to be sure that air refrigerant can flow through the system without the danger of leakage or
pressure issues. Air and moisture that is left in the ping can lead to undesirable results and can cause
damage to the working unit. it is important to go through a complete air-purging cycle to be sure that the
lines are cleared out. Note that you may have to repeat this process if any air or moisture is found to
remain in the piping. After air purging and evacuating the lines, be sure do a leak test for all piping and
tubing.
1. Verify that each set of pipes (liquid and gas) are properly connected between the indoor and outdoor
unit.
2. Verify that all wiring for a test run is complete.
3. Remove the service-valve caps from the gas and liquid valves at the outdoor unit, Figure 5-39.
• Keep both liquid and gas service valves closed at this step.
Figure 5-39 Removing service-valve caps from outdoor unit for purging
NOTE
Insufficient or incorrectly-performed air purging may lead to the following:
• Pressure in the system can rise.
• Operating current can rise.
• Cooling or heating efficiency falls.
• Moisture in the refrigerant circuit may freeze and block capillary tubing.
• Water can lead to corrosion of parts in the system.
Evacuation
Outdoor Unit
Gas sid e
Liquid side
Valve
Caps
2-way valve(Close)
3-way valve(Close)
2-way valve(Close)
3-way valve(Close)
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