Pipe Connection Design Guidance For 3 Pipes Heat Recovery System - Hisense AVWT-76FKFSHA Technical Handbook

1.4.3 Pipe Connection Design Guidance for 3 Pipes Heat Recovery System

Outdoor
Unit
Manifold Manifold
Pipe1 Pipe2
(*) (*)
①
②
②
③
First
Branch
④
④
④
⑤
Multi Branch SW BOX
⑦
Indoor
⑥
Unit
H5
e
⑦
f
Indoor
Unit
Single
Branch
L3
⑦
Water
Module
Heating Only
Pipe Length and Height Difference
Total Piping Length
Piping Length between Manifold Pipe 1 and Each Outdoor Unit
Maximum Piping Length
Maximum Piping Length between First Branch and Each Indoor Unit
Maximum Piping Length between Each Branch Pipe and Each Indoor Unit
Total Piping Length between Switch Box and Each Indoor Unit
Height Difference between Outdoor Units and Indoor
Units
Height Difference between Indoor Units
Height Difference between Switch Box and Indoor Units
Height Difference between Indoor Units using the Same Branch of Switch Box
Height Difference between Switch Boxes
Height Difference between Outdoor Units
NOTE：
(1) Check the gas pipe and liquid pipe are equivalent in terms of the piping length and piping system.
(2) Piping length between outdoor units should be La≤Lb≤Lc≤Ld≤10m.
(3) If the piping length between some branch and indoor unit (L3) is considerably longer than others, refrigerant may not flow well and
also performance may be deteriorated compared to other models. (Recommended: L3≤15m)
(4) When the liquid piping length is longer than 15m, use Φ9.53 pipe and reducer (field-supplied).
(5) Allowable total piping length may become shorter than 1,000m due to the limitation of maximum additional refrigerant amount.
(6) Fuction setting of Ci is required (Ci=2), in case of height difference between indoor units: 15m ＜ H2 ≤30m.
(7) In case of the height difference between outdoor units and indoor units: 50 m(40m) ＜ H1 ≤90m, contact technical department of the
manufacture.
Outdoor
Outdoor
Outdoor
Unit
Unit
Unit
Lb Lc
① ① ①
La
(*)
Manifold
Pipe3
⑦
⑤
L3
Single
Branch
...... ⑦ ⑦ L4
L4
Water
Water Indoor
Module Module Unit
Cooling Only
H3
g
⑦
Indoor
Unit
⑤
g
e
⑦
⑥
f
⑦
H4
Indoor
Unit
Indoor
Unit
Item
Actual Length
Equivalent Length
O.U. is Higher
O.U. is Lower
H6
(*) Keep the straight line distance of 500mm or more
Ld
after the manifold pipe
For single branch SW BOX:
H1 For multi branch SW BOX:
H2
L1
L3 L2
Mark
Total Liquid Piping
Actual Length
La, Lb, Lc, Ld
L1
L2
L3
L4
e+f+g
H1
H2
H3
H4
H5
H6
23
: High/Low Pressure Gas Pipe, Low Pressure
Gas Pipe, Liquid Pipe
: Gas Pipe, Liquid Pipe
: Low Pressure Gas Pipe, Liquid Pipe (For
Cooling Only Indoor Unit)
: High/Low Pressure Gas Pipe, Liquid Pipe (For
Heating Only Water Module)
Permitted Value
< Recommended
≥ Recommended
Connectable Number
Connectable Number
of Indoor Unit and of Indoor Unit or
Water Module
Water Module
≤1000m ≤300m
≤10m
≤165m
≤190m
≤90m ≤40m
≤40m ≤30m
≤40m
≤50m
≤40m
≤30m
≤15m
≤4m
≤15m
≤0.1m