9. Piping work and refrigerant charge
38 SS-SVM001A-EM
Do use nitrogen when performing air-tight test.
Connect the gauge manifold using charging hoses with a nitrogen cylinder to the check joints
of the liquid line and the gas line stop valves. Perform the air-tight test. Don’t open the gas line
stop valves. Apply nitrogen gas pressure of 550 psig (3.8MPa). Check for any gas leakage at
the flare nut connections, or brazed parts by gas leak detector or foaming agent. It is OK if gas
pressure does not decrease. After the air tight test, release nitrogen gas.
Although refrigerant has been charged into this unit, additional refrigerant charge is required
according to the piping length.
• The additional refrigerant precharge quantity should be determined and charged into the
system according to the following procedure.
• Record the additional refrigerant quantity in order to facilitate maintenance and servicing
activities.
Refrigerant charge before shipment (W0 (oz.))
W0 is the outdoor unit refrigerant charge before shipment;
Xg is additional refrigerant outdoor unit needed to charge according to piping length during
installation.
9.3 Air tight test
9.4 Additional refrigerant charge
Model
Refrigerant
precharged before
shipment (oz.)
Total refrigerant pipe length
0ft.~25ft. Longer than 25ft.
36K 98.7 0
Xg = 0.38oz/ft ×( Total pipe length(ft.) -25)48K 141.1 0
60K 152.7 0
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