14
5.4 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
-0.1Mp 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.
7)
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).
8)
Turn the flare nut of the 3-way valves about
45° counterclockwise for 6 or 7seconds
after the gas comes 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.
9)
Fully open the 2 way valve and 3 way valve and
securely tighten the cap of the 3 way valve.
2. Air purging by refrigerant
Procedure:
1)
Confirm that both the 2-way and 3-way valves are
set to the closed position.
2)
Connect the charge set and a charging
cylinder to the service port of the 3-way valve.
Summary of Contents for DA1221-H2-I
Page 1: ...DuctlessAire ES Series Service Manual 2016 ABSSA B4 1601 ...
Page 8: ...6 For DA1221 H2 I For DA1821 H2 I DA2421 H2 I ...
Page 10: ...8 For DA1221 H2 O ...
Page 11: ...9 For DA1821 H2 O ...
Page 12: ...10 For DA2421 H2 O ...
