Pumping Down (Re-Installation) - Midea MSQ-07CR Service Manual

8.5 Pumping down (Re-installation)

1. Confirm that both the 2-way and 3-way valves are set to the opened position.
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Remove the valve stem caps and confirm that the valve stems are in the opened position.
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3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve.
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Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
6. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
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8. Disconnect the charge set, and amount the 2-way and 3-way valve's stem nuts and service port caps.
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Use a torque wrench to tighten the service port cap to a torque of 1.8 kg.m.
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Service manual
Procedure
Be sure to use a hexagonal wrench to operate the valve stems.
2. Operate the unit for 10 to 15 minutes.
Connect the charge hose with the push pin to the gas service port.
4. Air purging of the charge hose.
5. Set the 2-way valve to the close position.
7. Immediately set the 3-way valve to the closed position.
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
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Be sure to check for gas leakage.