IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 140641571

07
Figure 3-3
Figure 3-4
3.4 Refrigerant Piping
3.4.1 Material and Size of the Piping
3.4.2 Pipe Limits
3.4.3 Welding Precautions
Only seamless phosphorus-deoxidized copper piping
that complies with all applicable laws should be used.
Temper grades and minimum thicknesses for different
diameters of piping are specified in Table 3-5.
Table 3-5
Ф6.35
Ф9.53
Ф12.7
Ф15.9
Ф19.1
Ф22.2
Ф25.4
Ф28.6
Ф31.8
Ф38.1
Ф41.3
Ф44.5
Ф54.0
0.8
0.8
0.8
1.0
1.0
1.2
1.2
1.3
1.5
1.5
1.5
1.5
1.8
Piping Outer
Diameter (mm)
Min. Thickness
(mm)
Temper
O (annealed)
1/2H (half hard)
Note: O: coiled piping; 1/2H: straight piping.
When the required pipe sizes (in inch) are not available,
other diameters (in mm) may also be used, provided that
the following is taken into account:
Select the pipe size nearest to the required size.
Use suitable adapters for the change-over from inch
to mm pipes (field supply).
AHU BOX
Liquid pipe
AHU
1. The connecting distance of each control box and AHU
should not be more than 8 m. If the AHU control box and
EEV are to be installed apart, the distance between them
must be within 5 m.
2. The maximum allowed piping length between the
ODU and the AHU control box depends on the ODU
model.
1. Nitrogen must be applied before welding.
Failure to apply nitrogen in advance may result in a large
amount of oxide residue on the interior surface of the
copper tube, which will affect the normal operation of the
valve body and compressor, and may damage the
compressor in serious cases.
How to remove EEV from the AHU control box.
The EEV may be removed from the AHU control box and
positioned in an external location. Follow these steps to
remove the EEV from the box.