AUX ACHP-H04/4R3HA, Техническое и сервисное руководство

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R32 Split Type - Air Source Heat Pump 20220105
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tightness test procedure is as follows:
Step 1
Once the piping system is complete and the hydronic box and outdoor unit have been connected, vacuum the
piping to 0.1MPa.
Step 2
 Charge the piping with nitrogen at 4.3MPa and leave for at least 24 hours.
 After the test period of at least 24 hours, observe the pressure in the piping and assess whether or not the
observed pressure indicates the presence of a leak. Allow for any change in ambient temperature over the test
period by adjusting the reference pressure by 0.01MPa per 1C of temperature difference. Adjusted reference
pressure = Pressure at pressuri (temperature at observation temperature at pressurization) x 0.01MPa.
 Compare the observed pressure with the adjusted reference pressure. If they are the same, the piping has
passed the gastightness test.
 If the observed pressure is lower than the adjusted reference pressure, the piping has failed the test. Refer
to
Part 3, 3.9.3 Leak detection. Once the leak has been found and fixed, the gastightness test should be
repeated.
Step 3
 If not continuing straight to vacuum drying (see Part 3, 3.10 Vacuum Drying) once the gastightness test is
complete, reduce the system pressure to 0.50.8MPa and leave the system pressurized until ready to carry out
the vacuum drying procedure.
Gastightness test
2.9.3 Leak detection
Notes for installers
1. Audio detection: relatively large leaks are audible.
2. Touch detection: place your hand at joints to feel for escaping gas.
3. Soapy water detection: small leaks can be detected by the formation of bubbles when soapy water is applied