IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 141028052

08
1
2
3
4
5
6
Refrigerant piping
Part to be brazed
Nitrogen connection
Hand-operated valve
Pressure relief damper
Nitrogen
A
B
Liquid tube
refrigerant inlet
Liquid tube
refrigerant outlet
Figure 3-5
Figure 3-6
3.4.4 AHU Control Box Installation
2. When performing welding, use the pressure relief
damper to keep the nitrogen pressure in the pipe at the
range of 0.02-0.03 Mpa (as if the air is blowing gently on
the skin).
1 2 3 4 5
6
6
1. Drill four holes where you want to install the box, with
the positions of the holes shown below. Secure the AHU
control box using screws.
2. Remove seals from the inlet and outlet.
3.Weld pipes on site
4. After the pipes are installed, insulate the pipes.
5.Pipe diameter requirements for the AHU control box
are as follows:
A
B
When welding pipes at the AHU control box, the
valve body and filter should be cooled with a wet
cloth to prevent damage to the EEV due to
excessively high temperatures.
NOTE
Control
Box
Capacity
A(×100W)
AHU BOX-
2290
AHU BOX
90200
AHU BOX
90200
AHU BOX
200360
AHU BOX
360560
Liquid
Side (mm)
A<56
Φ6.35
Φ9.53 Φ9.53 Φ12.7 Φ15.9
90<A≤
200
56≤A≤
90
200<A
≤360
360<A
≤560
Table 3-6
For installation of other piping and branch pipes, refer to
the ODU installation manual.
Figure 3-7
A
a1
L1
B
b1
c1
Liquid pipe
Gas pipe
DX AHU
outdoor unit
a2
b2
c2
L2
Liquid pipe
AHU 360560 (56kW)
AHU 200360 (28W)
AHU 90200 (14kW)
A
B
L3
L4
Table 3-7
L
1 , L 2 ,L 3 , L 4
a 1 ,a 2 ,b 1 ,b 2 ,c 1 ,c 2
A, B
Pipe name
Code ( refer to Figure 3-7)
AHU Control box main pipe
AHU Control box aux. pipe
AHU Control box branch
joint assembly
3.4.5 Pipe classification
e.x.1: Refer to Figure 3-7, the capacity of downstream
controller box to L4 is 560+280+140=980, the pipe is
Φ19.1.
Capacity of
AHU control
box A(×100W)
Size of main pipe(mm)
Liquid side(mm)
Φ12.7
Φ15.9
Φ19.1
Φ22.2
200<A≤450
450<A<660
660≤A<1350
1350≤A<1800
Table 3-8
JOINT IN 03 2P
JOINT IN 02 2P
JOINT IN 04 2P
JOINT IN 05 2P
Available branch joint
3.4.6 Size of joint pipe for R410A DX AHU
Φ25.4
1800≤A
JOINT IN 05 2P
Note:
The connecting distance of each control box and DX
AHU should not more than 8 m
a2+L4≤8m b2+L2+L4≤8m c2+L2+L4≤8m
N0
N2
N1