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Piping System
3.4 Pipe Connection Design Guidance for 2 Pipes Heat Pump System
(*) Keep the straight line distance of 19-11/16in.
(500mm) or more after the manifold pipe
Item Mark
Permitted Value
< Recommended
Connectable Number
of Indoor Unit and
Water Module
≥ Recommended
Connectable
Number of Indoor
Unit or Water
Module
Total Piping Length
Total Liquid Piping
Actual Length
≤3280.8ft.(1000m) ≤984.3ft.(300m)
Piping Length between Manifold Pipe 1 and Each Outdoor Unit La, Lb, Lc ≤32.8ft.(10m)
Maximum Piping Length
Actual Length
L1
≤541.3ft.(165m)
Equivalent ≤623.4ft.(190m)
Maximum Piping Length between First Branch and Each Indoor Unit L2 ≤295.3ft.(90m) ≤131.2ft.(40m)
Maximum Piping Length between Each Branch Pipe and Each Indoor Unit L3 ≤131.2ft.(40m) ≤98.4ft.(30m)
Height Dierence between Outdoor Units and
Indoor Units
O.U. is Higher
H1
≤164ft.(50m)
O.U. is Lower ≤131.2ft.(40m)
Height Dierence between Indoor Units H2 ≤98.4ft.(30m)
Height Dierence between Outdoor Units H6 ≤0.3ft.(0.1m)
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 ow 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 (eld-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 dierence between indoor units: 49.2ft.(15m) < H2 ≤98.4ft.(30m).
(7) In case of the height dierence between outdoor units and indoor units: 164ft.(131.2ft.) < H1 ≤295.3ft., contact technical
department of the manufacture
.
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