Haier 1U25S2SM1FA Installation Manual page 24

1.
Install the removed flare nuts to the pipes to be connected,then flare the pipes
The values of The piping size are shown in table 4
2. Connection of pipes
To bend a pi pe, give the roundness as large as possible not to crush the pipe ,
and the bending radius should be 30 to 40 mm or longer.
Connecting the pipe of gas side rst makes working easier.
The connection pipe is specialized for R32.
Spanner
Be careful that matters, such as wastes of sand s,water, , etc. shall not enter the pipe.
CAUTION
The standard pipe length is C m. If it is over D m, the function of the unit will be affected. If the pipe has
to be lengthened, the refrigerant should be charged, according to E g/m. But the charge of refrigerant
must be conducted by profes sional air conditioner engineer. Before adding additional refrigerant,
perform air purging from the refrigerant pipes and indoor unit using a vacuum pump,then
additional refrigerant.
21
Half union
Flare nut
Torque wrench
Indoor unit
B
A
Outdoor unit
Outdoor unit
Oil trap
B
Indoor unit
A
The values are shown in table 5
Forced fastening without careful centering may
damage the threads and cause a leakage of gas.
Pipe Diameter( )
Liquid side6.35mm(1/4")
Liquid/Gas side9.52mm(3/8")
Gas side 12.7mm(1/2")
Gas side 15.88mm(5/8")
Outdoor unit
B
A
Max.Elevation: Amax
In case the elevation A is more
than 5m, oil trap shoud be
installed every 5~7
Max. Length: Bmax
M i n. Length: B min
In case the pipe length B is
more thanDm, the refrigerant
should be charged, according
to E g/m.
Fastening torque
18~20N.m
30~35N.m
35~45N.m
45~55N.m
charge
Indoor unit