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Heat Controller, Inc. VMH SerieS Service Manual
18
2. Refrigerant charging
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. Because the refrigerant is R-410A, turn the cylinder upside down, such that the bottom is
upward, to ensure a 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
(Do not vent refrigerant into the atmosphere).
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),5oz. each time) , operating the air conditioner in the cooling cycle. Wait
approximately 1 minute and then repeat the procedure as needed.
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). Replace the valve stem caps and the service port that were previously removed.
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage using soap water.