Haier AU242FHBHA Installation Manual page 10

Installation Procedures
Piping operating precautions
1. When Using braze welding to connect the half union, inflate nitrogen to avoid pipe oxidation.
2. Use new clean piping as refrigerant piping. Be careful not to let water or foreign matters enter the pipe when operating.
3. When tightening and loosening connecting nuts, make sure to use two spanners simultaneously. Nuts cannot be tight
enough with only one spanner.
Selection of piping materials and dimension
Selection of the diameter of refrigerant piping
(following *** refer to the illustrations)
*Piping from outdoor unit to the first branch piping
(for short main piping hereinafter) Main piping should
consist to the piping dimension of outdoor unit.
*Piping between branch pipes (for short branch piping hereinafter):
Choosing of the diameter of branch pipe is according to the total capacity of all indoor units. But if exceeding the
capacity of outdoor unit, choosing is according the capacity of outdoor unit.
Model Capacity
07
09
12
14
*Piping between branch pipes and indoor units (for short indoor pipe hereinbefore):
The piping should consist to the diameter of indoor unit
piping. But during the first branch pipe, if the pipe length
is longer than 30m,a larger scale of gas pipe diameter
should be chosen.
Total capacity of all indoor units
Adopt FQG-B120 for Y type branch pipe.
Total capacity of all indoor units 9500W*~
Total capacity of all indoor units
Table1 Diameter of main piping [Inside ( ) is connecting way of outdoor unit]
AU242~282 type
Gas piping
15.88 (Screw thread)
Liquid piping
9.52 (Screw thread)
Table2 Diameter of branch piping
Total capacity of indoor units
2 3
(x10 W)/(x10 BTU/h)
*111/*38
111* ~ *182/38* ~ *62
*182/*62
Model and capacity of indoor unit
3
( 2 )/(x10 BTU/h)
x10 W
18/7
25/9
32/12
40/14
9500W,
17900W,Adopt FQG-B370 for Y type branch pipe.
AU60N type
Gas piping
22.22 (Soft soldering)
Liquid piping
12.7(Screw thread)
Gas piping Liquid piping
15.88 9.52
19.05 9.52
22.22 12.7
Tightening moment of connecting nuts
Connecting piping
diameter
6.35mm
9.52mm
12.70mm
15.88mm
19.05mm
Model
18
21
24
Outdoor unit
First branch
17900W, Adopt FQG-B180 for Y type branch pipe.
Other type units
Gas piping
19.05(Screw thread)
Liquid piping
9.52 (Screw thread)
Outdoor unit
L
1
First branch piping
9
Connecting piping
Installation moment Tightening
11.8(1.2kgf . m)
24.5(2.5kgf . m)
49.0(5.0kgf . m)
78.4(8.0kgf . m)
98.0(10.0kgf . m)
Capacity 3
( 2 )/(x10 BTU/h)
x10 W
50/18
60/21
71/24
L
L
3
2
a g b h
f
Indoor unit
Length of the longest piping L 70m
Length of the longest piping after the first
branch piping L 30m
moment
13.7(1.4kgf . m)
29.4(3.0kgf . m)
53.9(5.5kgf . m)
98.0(10.0kgf . m)
117.7(12.0kgf . m)
L
4
e
c d
i
h 10m