33
CONNECTING REFRIGERANT PIPING LINES (Cont.)
AIR AND MOISTURE PURGE (Cont.)
(B) AIR PURGE USING THE VACUUM PUMP
1. Connect the gauge manifold and the vacuum pump.
2. Open the low-pressure valve and close the high-
pressure valve of gauge manifold completely.
3. Operate the vacuum pump during at least 20 minutes
until the pressure reaches – 101Kpa (-760mm Hg).
4. Close the low-pressure valve of the gauge manifold
and stop the vacuum pump operation.
(If the indicator of gauge manifold is returned within
1-2 minute after stopping the vacuum pump, check
the piping connection leakage).
5. Close both the liquid and suction valve caps completely.
6. Remove the gauge manifold and the vacuum pump.
(During the disconnection, please be cautious not to loose
any refrigerant and oil).
7. Reinstall the valve caps and service port nuts.
(C) NOTES:
Tighten the valve caps and the service port nut to the
specified torque as shown in the table:
CONNECTION DIAGRAM OF VACUUM PUMP
PART
TIGHTENING TORQUE
(Kgf – Cm)
SERVICE PORT NUT
150
→
200
VALVE CAP
170
→
220
Valve Stem
Valve Cap
Valve Cap
Hex key Wrench
Low
pressure valve
High
pressure valve
Gauge manifold
Vacuum Pump
Valve Core
Service Port Nut
Indoor Unit
Suction
Line
Liquid
Line
Vacuum
Pump
Outdoor Unit
Split System 53QG Series
Summary of Contents for 42QG18-C
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