Table 4-13. Piping and Component Names
Table 4-14. Summary of permitted refrigerant piping lengths and level differences
NAME
Outdoor unit connection pipe
Outdoor unit branch joint
Main pipe
Indoor unit main pipe
Branch joint between main pipe and MS box or HT hydro module
Branch joint between MS box and indoor unit
Indoor unit auxiliary pipe
VRF indoor unit
HT hydro module
Designation
g1, g2, g3, G1
L, M
L1
L2 to L9
A to E
I
a to o
N1 to N11
N12 , N13
Permitted values
|
`
|
+
`
+
Piping in Fig. 4-4
\ _ #
Piping lengths
Level
dif
ferences
Total piping length
1
Piping between farthest VRF
indoor unit or HT hydro module
and outdoor unit or the last
multi-outdoor piping branch
2
Actual length
Equivalent length
Outdoor unit is above
Outdoor unit is below
Piping between outdoor unit and outdoor branch joint
Largest level difference between
VRF indoor unit or HT hydro
module and outdoor unit
L1 + L2 + L4 + f + i
L2 + L4 + f + i
Piping between farthest VRF indoor unit or HT hydro
module and first branch joint
Largest level difference between VRF indoor units or HT
hydro modules
Notes:
1. The total length of piping in one refrigerant system should not exceed 600 m. When calculating the total length of piping, the
actual length of the indoor main pipes (the piping between the first branch joint and MS box or last branch joint connected to HT
hydro modules, L2 to L9) should be doubled.
2. The piping between the farthest VRF indoor unit (N8) or HT hydro module (N13) and outdoor unit or the last multi-outdoor
piping branch joint (L) should not exceed 135 m (actual length) and 160 m (equivalent length). (The equivalent length of each
branch joint is 0.5 m). When the equivalent piping length from outdoor units to the farthest VRF indoor unit or HT hydro module
]_*$#*##!#*+@
13
