Hitachi FSG1 Series Technical Catalogue page 284

REFRIGERANT PIPING AND REFRIGERANT CHARGE
13
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13.1.4. PIPING SIZE AND DISTRIBUTOR FXG/FXG1
In addition to the Epoch-making "Uni-Piping System", where
the same pipe size as the main refrigerant pipe can be
utilised, the "Down-Pipe System" is also available for piping
cost reduction.
As indicated the table below, "Down pipe system" is
recommended for 20HP and 30HP, because of cost
reduction is reached using it.
¡
Table : 3 pipes part of Outdoor Unit ~ 1
Pipe Size (f mm)
Outdoor Unit
Low High
Gas Gas
25.4
RAS-8FXG 19.05
(22.2)
28.6
RAS-10FXG 19.05
(25.4)
38.1 25.4
RAS-20FXG1
(34.92) (22.2)
44.45 31.75
RAS-30FXG1
(41.3) (28.6)
¢
st
Table : 3 pipes part of 1 Branch ~ Last Branch
Total Capacity of Pipe Size (f mm)
Indoor Units
Low Gas High Gas
HP<10 25.4 (22.2)
10£HP<13
28.6
(7.5£HP<13.1)
13£HP<16 31.75 (28.6)
38.1 (34.92) 25.4 (22.2)
16£HP<22
22£HP<26 38.1 (34.92)
44.45 (41.3) 31.75 (28.6)
26£HP
The multi-kit selected must be compatible with pipe selected in table (1). See
chapter 13.2 for more information
See tables #
st
Branch
Liquid Multi-Kit
STD Longer
12.7 12.7 E-82XME1
12.7 15.88 E-102XME1
15.88 19.05 E-242X
22.2 22.2 E-302X
Multi-Kit
Liquid
19.05 12.7 E-82XME1
19.05 12.7 (15.88) E-102XME1
22.2 15.88 E-152X
15.88 E-242X
28.6 19.05 E-242X
22.2 E-302X
Pipe Size System
Outdoor Unit Uni-Piping
RAS-8FXG
RAS-10FXG
RAS-20FXG1
RAS-30FXG1
¡: Available; Ä: Not recommended ; X: Not available
£
Table : 3 pipes part of Branch ~ CH Unit
Pipe Size (f mm)
Total Capacity of
Low
Indoor Units
High Gas
Gas
HP<4 15.88
19.05
4£HP<6.5
6.5£HP£11.5 28.6
¤
Table : 2 pipes part of CH Unit ~ 1
Pipe Size (f mm)
CH Unit
Gas
CH-4.0GE 15.88 (1)
CH-6.5GE 19.05
CH-11.5G 28.6
(1) Use the accessory reducer for Æ 12.7
(2) Use the accessory reducer for Æ 6.35
Down-Size
¡
X
¡
X
¡
Ä
¡
Ä
See tables #
CH Unit
Liquid
12.7 9.53 CH-4.0GE
15.88 9.53 CH-6.5GE
19.05 12.7 CH-11.5G
st
Branch
Multi-Kit
Liquid
9.53 (2) E-42ME1
9.53 E-52ME1
12.7 E-102ME1