Refrigerant Piping Selection; Refrigerant Piping And Refrigerant Charge; Refrigerant Piping Work Range - Hitachi FSG1 Series Technical Catalogue

REFRIGERANT PIPING AND REFRIGERANT CHARGE

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13.1. REFRIGERANT PIPING SELECTION

Set-Free system is designed considering be available in all
installation cases. Therefore, HITACHI is using two different
refrigerant pipe distributors:
Line Branch system and Header Branch system.
Both systems are available for two pipes system (FSG(1))
and three pipes system (FXG(1)) as indicated below.

13.1.1. REFRIGERANT PIPING WORK RANGE

The piping selection and distribution must be designed
considering the following specifications:
$
WARNING:
The liquid piping and the gas piping must be the same
piping length and run along the same route.
Install multi-Kits (Optional Accessory as system parts)
must be used for the branch pipe to the indoor unit.
Install multi-Kits as the same horizontal level.
Oil trap every H of height difference for gas piping
t
between indoor unit and outdoor unit is required when
Outdoor Unit is located higher than the Indoor Units.
n
Two Pipes System (FSG/FSG1)
Outdoor Unit
L
Trap (Refrigerant Piping at Gas Side)
Make a trap according to height difference
Hi-o
(Ht) between indoor unit and outdoor unit (see
table).
See Table (*)
Install
multi-Kits
horizontally
Indoor Units
However, in case that the Outdoor Unit is located
lower than Indoor Unit, it is not required to put oil trap
in the suction gas piping, since the oil in the system
can return to the compressor due to the oil return
control system.
Length between O.U. and
farthest I.U. (L)
Piping length from first branch to each I.U.
Total length from 1
Piping length from each Multi-Kit to I.U. (*)
Height difference (Hi-o) between O.U. to I.U.
(O.U. over I.U. / O.U. lower I.U.)
Height difference (Hi) between I.Us.
Oil Trap Height (Ht)
Hi
Li
ITEM
Actual
Equivalent
st
Multi-kit to all I.U. Li
(*) See Item 13.1.3 for more details
Applicable Range
FSG/FSG1
5~20HP 24~30HP
£100 £120
£125 £150
£30 £40
£480
-
£30 £30
£50/£40 £50/£40
£15 £15
£25 £10