Midea MSG-24CR, Service Manual

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Service manual
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8.9 Gas charging
Procedure:
1. Connect the charge hose to the charging cylinder.
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Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom
of the cylinder.
2. Purge the air from the charge hose.
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Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the
air (be careful of the liquid refrigerant).
3. Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
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If the system cannot be charge with the specified amount of refrigerant, if can be charged with a little
at a time (approximately 150g each time0 while operating the air conditioner in the cooling cycle;
however, one time is not sufficient, wait approximately 1 minute and then repeat the
procedure.(pumping down-pin).
4. Immediately disconnect the charge hose from the 3-way valve’s service port.
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Stopping partway will allow the refrigerant to be discharged.
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If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the
air conditioner before disconnecting the hose.
5. Mounted the valve stem caps and the service port
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Use torque wrench to tighten the service port cap to a torque of 18N.m.
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Be sure to check for gas leakage.