Airwell JSP023054, Service Manual

Page: 22 / 66

INSTALLATION DETAILS
DCH DCI 22 Version - 1
7.4 Installation for the first time
Air and moisture in the refrigerant system have
undesirable effects as below:
●
Pressure in the system rises.
●
Operating current rises.
●
Cooling or heating efficiency drops.
●
Moisture in the refrigerant circuit may freeze
and block capillary tubing.
●
Water may lead to corrosion of parts in the
refrigerant system.
Therefore, the indoor units and the pipes
between indoor and outdoor units must be leak
tested and evacuated to remove gas and moisture
from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent
on the indoor unit connections or outdoor unit
connections by a soft brush to check for leakage
of the connecting points of the piping. If bubbles
come out, the pipes have leakage.
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 charge hose with the push pin of
handle lo to the 3-way valves gas service port..
3) Connect the charge hose of handle hi
connection to the vacuum pump.
4) Fully open the handle Lo of the manifold valve.
5) Operate the vacuum pump to evacuate.
6) Make evacuation for 30 minutes and check
whether the compound meter indicates -
0.1Mpa. If the meter does not indicate -
0.1Mpa after pumping 30 minutes, it should be
pumped 20 minutes more. If the pressure can’t
achieve -0.1Mpa after pumping 50 minutes,
please check if there are some 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.
2.Adding the refrigerant if the pipe length >5m
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, make
the cylinder bottom up to ensure the 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) Operate the air conditioner at the cooling mode.