INVENTOR P8MVI32-09WiFi, Service Manual

Page: 23 / 72

21
6.4 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