Installation Manual - A-VMH18DU,28TU,36QU,48PU-1
25
Note On Adding Refrigerant
CAUTION
• Refrigerant charging must be performed after wiring, vacuuming, and the leak testing.
• DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system. Doing
so can damage the unit or impact it’s functioning.
• Charging with unsuitable substances may cause explosions or accidents. Ensure that the
appropriate refrigerant is used.
•
Refrigerant
containers must be opened slowly. Always use protective gear when charging the
system.
• DO NOT mix refrigerants types.
N=2(one-twin models), N=3(one-three models), N=4(one-four models). Depending on the
length of connective piping or the pressure of the evacuated system, you made need to add
refrigerant. Refer to table below for refrigerant amounts to be added:
Note: The standard pipe length is 7.5m (24.6’).
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Connective Pipe
Length(m)
Air Purging
Method
Additional Refrigerant
Pre-charge pipe length (ft/m)
(Standard pipe length xN )
Vacuum Pump
N/A
More than (Standard
pipe lengthxN) ft/m
Vacuum Pump
R410A
R410A
Liquid Side: Ø 6.35 (Ø 1/4”)
(Total pipe length - standard pipe lengthxN) x15g/m
(Total pipe length - standard pipe lengthxN) x0.16oZ/ft
Liquid Side: Ø 9.52 (Ø 3/8”)
(Total pipe length - standard pipe lengthxN) x30g/m
(Total pipe length - standard pipe lengthxN) x0.32oZ/ft
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