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Final Installation Procedures
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FINAL INSTALLATION PROCEDURES
Triple Evacuation Procedure
After the leak / pressure check is complete, it is a best practices recommendation that a triple evacuation procedure is performed to the
refrigerant piping and the connected indoor unit. Triple evacuation must be performed through the gas (vapor) suction Schrader port on the
outdoor unit service port.
The deep evacuation procedure is required for Single Zone systems. The triple evacuation procedure is a best practices recommendation for Single
Zone systems.
For faster evacuation, the Schrader core can be removed, and an auxiliary service port can used. Make sure to re-install the original Schrader core
before operating the system.
• Evacuate through just the gas (vapor) suction Schrader port on the outdoor unit service port.
• The outdoor unit service valves must remain closed and the stem head access caps tight.
Do not open the outdoor unit service valves
and release the factory refrigerant charge until trim charge is complete, and the system is ready to operate.
• Any field-installed ball valves in the refrigerant system (if used) must be open to ensure all piping is free and clear for evacuation on all
piping and connected indoor unit.
•
Never perform evacuation using refrigerant.
• Use only a vacuum pump that can reach 500 microns, vacuum rated hoses or copper tubing, and a leak-free gauge manifold set.
• Use only new vacuum pump oil from a properly sealed (unopened) container, and change oil in pump before EVERY use.
• Subsequent oil changes will be necessary after several hours of continuous operation; have extra oil on hand.
• Use a quality micron gauge in good operating order and install as far away from pump as possible.
Deep Evacuation Procedure, continued.
3.
(YDFXDWHWRVWDWLFPLFURQOHYHOIRUDWOHDVWRQHKRXU
4.
0LFURQOHYHOPXVWUHPDLQIRUWZRKRXUV,IWKHYDFXXPJDXJHULVHVDQGVWRSVWKH
system may contain moisture; therefore, it will be necessary to repeat the steps of vacuum
break and drying.
5. After maintaining the system in vacuum for two (2) hours, check if the vacuum gauge rises
or not. If it doesn’t rise, then the system is properly evacuated.
6. Close the manifold gauge.
7. Shut the valves before turning off and disconnecting the vacuum pump.
Figure 110: Evacuation Procedure Diagram.
Gauge Manifold
Micron Gauge
Deep Evacuation Procedure / Triple Evacuation Procedure
