Air Purging By The Refrigerant; Check The Gas Leakage - Heat Controller A-VMH18DC-1 Service Manual

VMH SerieS
Heat Controller, Inc. Service Manual
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
Disconnect the charge set, and tighten the 2-way and 3-way valve's stem nuts.
Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 N.m.
Be sure to check for gas leakage using soap water.
7). Remove the defective indoor unit and install the new indoor unit. Follow the next set of procedures to
charge.

2. Air purging by the refrigerant

Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the closed position.
2). Connect the charge set and a charging cylinder to the service port of the 3-way valve
Leave the valve on the charging cylinder closed.
3). Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on
the 2-way valve approximately 45° for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.

4). Check the gas leakage

Check the flare connections for gas leakage using soap water.
5). Discharge the refrigerant into charging cylinder.
Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the
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