DC Inverter Side Discharge VRF Ⅱ for North America
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leakage may be found out;
Step 2
：
Increase pressure slowly to 1.5MPa, stop for 5min to check the airtightness. Small
leakage may be found out;
Step 3
；
Increase pressure slowly to 4.15MPa for R410A slowly (3.0MPa for R22 refrigerant
system), stop for 5min and perform the strength test. Minor leakage or sand hole may be found.
Increase pressure to test pressurem, keep it for 24h and observe whether the pressure is
decreasing. If not, the pressure is qualified.
5.3.3 Cautions
(1) The test manometer range for R410A should be 4.5MPa above (3.5MPa above for R22
refrigerant system);
(2) Record the data on manometerk, ambient temperature and test time at the same time;
(3) Pressure modification: when temperature changes 1℃, the temperature will change 0.01MPa
correspondingly.
(4) Pressure should be kept the same.
(5) If it needs to keep pressure for a long time, decrease the pressire lower than 0.55MPa pr
below. Long-time high pressure can lead to leakage at the welding position, which may cause
riskl.
(6) Before the airtightness for the pipeline of refrigerant is finished, do not allow to insulate and
bundle the welding positions and connection position of bellmouth of indoor unit.
Note: Before airtightness test, all welding lines can’t be insulated and bundled.
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