Carrier 53QPCT18H-708F Installation Manual page 37

CONNECTING REFRIGERANT PIPING LINES (Cont.)
AIR PURGING OF INDOOR UNIT AND REFRIGERANT PIPING LINES (Cont.)
16-13-3 AIR PURGING OF INDOOR UNIT AND REFRIGERANT PIPING LINES
USING VACUUM PUMP
NOTES
NEVER use the system compressor as a vacuum pump.
For the vacuum pump, check oil is filled up to the specified line of the oil gauge.
Air purging procedure using vacuum pump
(1) Connect the vacuum pump to the charge set's centre hose.
(2) Evacuate for approximately one hour.
• Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg)
[vacuum of 4 mmHg or less].
(3) Close the valve ( Low side ) on the charge set, turn off the vacuum pump, and confirm that the
gauge needle does not move ( approximately 5 minutes after turning off the vacuum pump ).
(4) Disconnect the charge hose from the vacuum pump.
• Vacuum pump oil, if the vacuum pump oil becomes dirty or depleted, replenish as needed.
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