Midea MFE-60ARN1-RB4W Service Manual page 28

2. Refrigerant charging
Electronic scale
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the
3-way valve
Connect the charge hose which you disconnected from the vacuum pump to the valve at
the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to
ensure liquid charge.
2). Purge the air from the charge hose
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) Put the charging cylinder onto the electronic scale and record the weight.
4). Open the valves (Low side) on the charge set and charge the system with liquid
refrigerant
If the system cannot be charge with the specified amount of refrigerant, or can be
charged with a little at a time (approximately 150g each time) , operating the air
conditioner in the cooling cycle; however, one time is not sufficient, wait approximately 1
25