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5.2.
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 bar.
4. Close the pressure gauge unit valves on 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.
5.3.
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 pump specifically certified for R32 gas.
METHOD
1.
Connect the vacuum pump to the pressure gauge unit on the central socket.
2.
Connect the low pressure side of the pressure gauge unit to the service valve on the outdoor
unit (gas side).
3.
Open the low pressure side of the pressure gauge unit, with the service valve on the outdoor
unit still closed.
4.
Start up the vacuum pump. Leave the pump running until the pressure gauge indicates a
pressure value of -76cm/Hg.
5.
This operation will last 15 minutes or more.
6.
Once the process has been completed, close the valve on the unit and turn off the vacuum pump.
-76 cmHg
Low pressure
knob
Recharge
Low pressure valve
16
Valve block
Pressure gauge
High pressure knob
Recharge cable
Pump
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