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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 minute and then repeat the
procedure.
5).When the electronic scale displays the proper
weight, disconnect the charge hose from the 3-
way valve’s service port immediately
If the system has been charged with liquid
refrigerant while operating the air conditioner, turn
off the air conditioner before disconnecting the
hose.
6). Mounted the valve stem caps and the service
port. Use torque wrench to tighten the service
port cap to a torque of 18N·m (13.27 ft·lbs).
Always leak check after servicing the refrigerant
system.
For M3OF-27HFN1-M/M4OF-36HFN1-M/M5OF-
48HFN1-M
There are one low-pressure centralized valve and
one high-pressure centralized valve, it will be
more time saving when vacuum and recycle
refrigerant. But refer to the previous instruction
when vacuum and recycle refrigerant.
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