3 Piping work and refrigerant charge
Refrigerant piping range
SMGB0091 rev.2 - 11/2015
42
Maximum height difference (clarification)
It is recommended to install all indoor units at the same height. Nevertheless, when the height difference between the
indoor units due to building construction is necessary, this should be less than the value indicated in the figure:
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N O T E
All pictures are shown as an example.
3.3.4 Combinations of piping size and piping length
Refrigerant piping length between RASC unit and the farthest indoor unit (m)
Liquid
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Gas
Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø28.58 Ø22.20 Ø25.40 Ø28.58
(4-6) HP
5
(2)
5
(2)
40
(1)
75
5
(4)
-
-
30
(3)
30
(3) (4)
-
-
-
-
-
-
8 HP
-
-
-
-
50
(1) (4) (6)
50
(1) (6)
70
(5) (6)
-
50
(1) (3) (4)
50
(1) (3)
100
-
50
(1) (3)
50
(3)
-
10 HP
-
-
-
-
-
-
-
-
-
50
(1)
100
50
50
(1) (3)
50
(3)
50
(3)
(1). Reducing gas pipe size will reduce cooling capacity due to larger pressure loss in gas piping and narrow operation range.
(2). Reducing liquid pipe size will narrow operation range due to the indoor unit relation with expansion valve capacity. In these cases,
set the DSW2-1 to ON position.
(3). Increasing liquid pipe size will require additional refrigerant charge.
(4). When using Ø19.05 gas pipe (soft-annealed), please switch ON DSW2-4# in the RASC Unit PCB.
(5). In case that pipe length exceeds 70m in 8HP, please use a Ø12.7 pipe as a liquid pipe.
(6). In case of exceeding the recommended number of connected indoor (more than 4 units), please use a Ø12.7 pipe as liquid pipe.
Standard