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CONNECTING REFRIGERANT PIPING LINES
17.14 PUMPING DOWN (RE-INSTALLATION)
INTRODUCTION
Pumping down means collecting all the refrigerant in the system back into the outdoor unit.
Pumping down must be actuated before disconnection of pipes, to avoid loss of refrigerant suction.
Pumping down is used when the system is moved to another installation location or when the
system is repaired.
Pumping down Procedure
(1) Confirm that both the liquid and suction valves are set to the open position.
- Remove the valve stem caps and confirm that the valve stems are in the open position.
- Be sure to use a hexagonal wrench to operate the valve stems.
(2) Operate the system for 10 to 15 minutes.
(3) Stop operation and wait for 3 minutes, then connect the charging set to the service port
of the suction valve. Connect the charging hose with the push pin to the suction service port.
(4) Air purging of the charging hose.
Open the low-pressure valve on the charge set slightly to purge air from the charging hose.
(5) Set the liquid valve to the close position.
(6) Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
(7) Immediately set the suction valve to the closed position.
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
(8) Disconnect the charging set, and mount the liquid and suction valves stem nuts and service port caps.
Use a torque wrench to tighten the service port cap to a torque of 1.8 kg.m (18 N.m)
Be sure to check for refrigerant leakage.
Summary of Contents for ClassiCOOL 53KDHT60N-518
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