Filter
Top Products
15
Heat Controller, Inc. VMH SerieS Service Manual
14
6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose
from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the
hose.
7). 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.
7.5 Adding the refrigerant due to loss of charge
Procedure:
1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.
Connect the charge hose 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) Operate the air conditioner in the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant, (refer to
the gauge and the pressure of the low side).
6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low
Electronic scale