Re-Installation If The Indoor Unit Has Been Repaired; Evacuation For The Whole System - Century B-VMH36SD-1 Service Manual

Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
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.
6) When the electronic scale displays the proper
weight (refer to the gauge and the pressure
of the low side), disconnect the charge hose
from the 3-way valve's service port
immediately and turn off the air conditioner
before disconnecting the hose.
7) Mount the valve stem caps and the service
port. Use torque wrench to tighten the
service port cap to a torque of 13F.P.
Be sure to check for gas leakage.
6.6 Re-installation if the indoor unit has
been repaired
1. Air purging with vacuum pump
1) Completely tighten the flare nuts of the
indoor and outdoor units, confirm that both
the 2-way and 3-way valves are set to the
closed position.
2) Connect the low pressure charge hose to
the 3-way valve's gas service port.
3) Connect the high pressure charge hose to
the vacuum pump.
4) Fully open the low pressure handle of the
manifold.
5) Operate the vacuum pump to evacuate.
6) Evacuate for 30 minutes and check
whether the compound meter indicates
500 microns. If the meter does not indicate
500 microns after pumping 30 minutes, it
should be pumped 20 minutes more. If the
pressure can't achieve 500 microns after
pumping 50 minutes, please check for
leakage points. Fully close the low
pressure valve of the manifold and stop the
operation of the vacuum pump. Confirm
that the gauge needle does not move
(approximately 5 minutes after turning off
the vacuum pump).
7) Turn the flare nut of the 3-way valves
about 45° counterclockwise for 6 or 7
seconds after the gas coming out, then
tighten the flare nut again. Make sure the
pressure display in the pressure indicator
is a little higher than the atmosphere
pressure. Then remove the charge hose
from the 3-way valve.
8) Fully open the 2-way valve and 3-way
valve and securely tighten the cap of the
3-way valve.
6.7 Re-installation after outdoor unit
has been repaired

1. Evacuation for the whole system

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