HTW HTW-MO2-041IX41B2R32, Installation Manual

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 Page 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.
• For the R290 or R32 refrigerant model, make sure the condtions within the area have been
made safe by control of flammable material when the refrigerant added into air conditioner.
• The maximum refrigerant charge amount of R32 is 305 grams.
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), N=5(one-five 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
Liquid Side: Ø 6.35 (Ø 1/4”)
(Total pipe length - standard pipe lengthxN) x12g/m
(Total pipe length - standard pipe lengthxN) x0.13oZ/ft
Liquid Side: Ø 9.52 (Ø 3/8”)
R32 R32
R410A R410A
(Total pipe length - standard pipe lengthxN) x24g/m
(Total pipe length - standard pipe lengthxN) x0.26oZ/ft
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