Pipe Connection Design Guidance For 3 Pipes Heat Recovery System - Hisense Hi-FLEXi S Series Technical, Installation, Maintenance

3.3 Pipe Connection Design Guidance for 3 Pipes Heat Recovery System

Outdoor
Manifold Manifold
Pipe1 Pipe2
(*) (*)
③
First
Branch
④
④
④
⑤
Multi Branch SW BOX
⑦
Indoor
⑥
Unit
H5
e
f
Indoor
Unit
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≤32.8ft.(10m).
(3) If the piping length between 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≤49.2ft.(15m))
(4) When the liquid piping length is longer than 49.2ft. (15m), use Φ3/8in. (9.53mm) pipe and reducer (field-supplied).
(5) Allowable total piping length may become shorter than 3280.8ft.(1,000m) due to the limitation of maximum additional
refrigerant amount.
(6) Function setting of Ci is required (Ci=2), in case of height difference between indoor units: 49.2ft.(15m) < H2 ≤98.4ft.(30m).
(7) In case of the height difference between outdoor units and indoor units: 164ft.(131.2ft.) < H1 ≤295.3ft., contact technical
department of the manufacture.
Outdoor
Unit
Outdoor
Unit
Unit
①
Lb
Lc
La
⑦
⑤
L3
Single
Branch
......
⑦ ⑦
L4
Water Water
Module
Module
H3
g
⑦
⑦
Indoor
Unit
⑤
Single
Branch
g
e
⑥
f ⑦
H4
Indoor
Unit
Item
H6
L4
H1
Indoor
Unit
Cooling Only
H2
⑦
L3 L2 L1
Indoor
Unit
Mark
Total Liquid Piping
Actual Length
La, Lb, Lc
Actual Length
L1
Equivalent Length
L2
L3
L4
e+f+g
O.U. is Higher
H1
O.U. is Lower
H2
H3
H4
H5
H6
31
(*) Keep the straight line distance of 19-11/16in.
(500mm) or more after the manifold pipe
For single branch SW BOX:
Liquid pipe is not connected to SW BOX
For multi branch SW BOX:
: 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
Connectable Number of
Indoor Unit and Water
Module
≤3280.8ft.(1000m)
≤32.8ft.(10m)
≤541.3ft.(165m)
≤623.4ft.(190m)
≤295.3ft.(90m)
≤131.2ft.(40m)
≤131.2ft.(40m)
≤164ft.(50m)
≤131.2ft.(40m)
≤98.4ft.(30m)
≤49.2ft.(15m)
≤13.1ft.(4m)
≤49.2ft.(15m)
≤0.3ft.(0.1m)
Piping System
≥ Recommended
Connectable Number
of Indoor Unit or Water
Module
≤984.3ft.(300m)
≤131.2ft.(40m)
≤98.4ft.(30m)