Leak Test; Creating The Vacuum - Baxi JSGNW Installation And Support Manual

6.2.

LEAK TEST

Once all the refrigerant pipes have been connected, perform a test by pressurizing the system with
nitrogen to make sure there are no leaks.
Method
1. Connect the pressure gauge unit to the service valve on the outdoor unit gas pipe.
2. With the outdoor unit service valves closed, connect the nitrogen cylinder to the pressure
gauge unit so as to charge the pipes.
3. Charge the installation (pipes and indoor unit) with nitrogen at a pressure of about 40 bars.
4. Close the pressure gauge unit valves of the cylinder side. Then wait for the pressure to
stabilize.
5. Make sure that the pressure does not decrease. Once the pressure has stabilized, the test
time can be about 30 minutes.
6. After checking that the system is not leaking (using special leak detection devices), close
the valve on the pressure gauge unit to remove the nitrogen cylinder.
6.3.

CREATING THE VACUUM

After connecting the pipes and checking that there are no leaks, it is very important to
create a vacuum in the system to eliminate the moist air from inside it. Failure to do so
could cause problems to the compressor. Use a specific pump for R32 gas.
Method
1. The air conditioner gas evacuated using a vacuum pump.
Connect the pipes of indoor units and outdoor unit according to the figure below, and
tighten all the bell coupling nuts of indoor and outdoor to prevent leakage.
2. Connect the cut-off valves, charge hose, manifold valve and vacuum pump as the
figure below.
3. Please fully open the manifold valve handle Lo and Hi, and do the vacuum
processing, make sure the vacuum gauge indicates the pressure has reached -
0.1MPa (-76cmHg);
4. After completion of vacuum processing, use the hex wrench to open a little the liquid
valves then quickly remove the hose of gas valve (remove the hose to prevent air
from entering the system);
5. Open all the cut-off valve and check the connecting mouth of indoor and outdoor, then
cover the cut-off valves after confirm there is no leak.
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