Leakage Test - Haier MRV II Instruction Manual

10 Leakage test

Connect nitrogen tank, pressure relief gauge, gauge manifold and
refrigerant system in turn, charge nitrogen to system both on high and
low pressure sides at same time, notice items:
10.1 Please must test system by nitrogen , do not use any other gas.
10.2 It is better to do the leakage test before connecting with outdoor unit,
because the stop valve of outdoor unit may leak due to welding or outside
force, then nitrogen will go into outdoor circle system.
10.3 Apply pressure both on gas and liquid sides at same time, pressure
charging work can be done by two or three steps , at first apply a lower
pressure to system, if no big leakage be found ,then apply a higher
pressure.
10.4 Check the welded joint and flared joint with suds one by one. If leaks,
air bubble will come out.
10.5 After leakage test, place the unit for 24 hours, if the pressure does
not go down, there is no leakage.(Environment temperature will affect
system pressure, generally , when the environment temperature changes
1 degree, system pressure will change 0.1 Kg/cm
10.6 If the system pressure goes down over 0.3 Kg/cm
and no obvious leakage position can be found ,please check again
segment by segment , reduce the checking area.
10.7 After finding out the leakage and execute relative treatment , please
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within 24 hours,
Part 1