Service Manual - DVH 09/12/18/24 SF Series
Service Manual - DVH 09/12/18/24 SF Series
16
pumping 50 minutes, please check for leakage
points. Fully close the handle Lo valve of the
manifold valve 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 7seconds 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 when the outdoor
unit has been repaired
1. Evacuation for the whole system
Procedure:
1). Confirm that both the 2-way and 3-way
valves are set to the opened position.
2). Connect the vacuum pump to 3-way valve’s
service port.
3). Evacuate for approximately one hour.
Confirm that the micron gauge indicates
200 microns.
4). Close the valve (Low side) on the charge set,
turn off the vacuum pump, and confirm that the
gauge needle does not move (approximately 5
minutes after turning off the vacuum pump).
5). Disconnect the charge hose from the
vacuum pump.
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. If the
refrigerant is R410A, turn the cylinder bottom up
to ensure liquid charge.
2). Purge the air from the charge hose
Open the v
alve 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 charged with the
specified amount of refrigerant, or can be
charged with a little at a time (approximately 5oz.
each time) , operating the air conditioner in the
cooling cycle. If 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
6). Mount the valve stem caps and the service
port. Use torque wrench to tighten the service
port cap to a torque of 18N.m. Be sure to check
for gas leakage.
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