Hitachi FSG1 Series Technical Catalogue page 318

REFRIGERANT PIPING AND REFRIGERANT CHARGE
13
/42
n
Piping System and Additional refrigerant (FXG series)
ITEM
Example of Systems
This figure shows an example of 5 indoor units combined
with one outdoor unit.
The refrigerant pipes are shown as single line in the
diagrams.
However in the field, liquid line piping, gas (high) line
piping and gas (low) gas piping are required between the
outdoor unit and the CH unit, and liquid line piping and
gas line piping are required between the CH unit and the
indoor unit.
?
NOTE:
Provide oil trap to both gas lines at every Ht meters lift.
(Ht is indicated in Chapter 13.1.1).
*CH Units should be installed in the same floor
Actual Length
Maximum Piping
Length
Equivalent Length
In the case that the position of outdoor unit
Maximum Lift
is higher than that of indoor unit.
between
Outdoor Unit
In the case that the position of outdoor unit
and Indoor Unit
is lower than that of indoor unit.
Maximum Lift between Each Indoor Unit, or Multi-Kit and indoor Unit
Maximum Lift among Indoor Unit connected to the same CH unit.
Maximum difference of piping length between each indoor
unit and same CH Unit.
Between Multi-Kit "a" and the Farthest
Maximum
Indoor Unit
Piping Length
Between Each Multi-Kit and Each Indoor
between Multi-
Unit
Kit and Indoor
Between last multi-kit and the farthest
Unit
Indoor Unit
Choice of each Multi-kit
Quantity of Additional Refrigerant Charge
The quantity is calculated by the following
equation:
W (kg) = W11+W12+W2
1) W11 (kg): (Total Length (m) of Ø12.7
Liquid Piping) x 0.120
W12 (kg): (Total Length (m) of Ø9.53
Liquid Piping) x 0.065
W13 (kg): (Total Length (m) of Ø6.35
Liquid Piping) x 0.026
2) W2 (kg)
Total quantity of Additional Refrigerant of
Each Indoor unit (kg)
Outdoor Unit
Outdoor Unit Use E-82XME
CH-4.0GE Use E-42ME at "d".
CH-6.5GE Use E-52ME at "d".
In case of using indoor unit as exclusive cooling, use multi-kit of FSG .
Example: In case of RAS-8FXG
Lt–L8
Mark
Size
Liquid Line
Length
W11 = 43 x 0.120 = 5.2
W12 = (8 + 2 + 2 + 2) x 0.065 = 0.9
W13 = (5 + 8 + 8 + 3 + 3) x 0.026 = 0.7
Indoor Unit No..
Corresponding
Power (HP)
Additional
Indoor unit
refrigerant Quantity
*
: Select the "N" indoor Units in order from the smaller indoor unit (Refer
to Page 12-6). W2=0
W = W11 + W12 + W13 + W2
Total = 5.2 + 0.9 + 0.7 + 0
= 6.8 kg
(*1) If piping length between main multi-kit "c" and the farthest indoor unit is longer than
5m, the liquid pipe multi-kit should be T-branch (See page 13-9)
LINE BRANCH SYSTEM
Provide oil trap to both gas line at every Ht meters lift
Hi £ 50m (Position of outdoor unit is higher)
Hi £ 40m (Position of outdoor unit is lower)
H2 £ 15m
H3 £ 4m
Actual Lt £ 100m
L £ 30m
Equivalent Lt £ 125m
Lt £ 100 m
Lt £ 125 m
H1£ 50 m
H1 £ 40 m
H2 £ 15 m
H3 £ 4 m
L4 - L3 £ 5 m
L £ 30 m
L0, L1, L2, L3, L4 £ 30 m
(*1) L5 + L6, L7 + L8 £ 5 m
L0 L2 L5 L7 L1
–L7
12.7 Ø9.53
43 8 2 2 2 5
0 1
1 1.5 1.5
Indoor Unit which do not require the
additional charge
L3 L4 L6 L8 L
#
Ø6.35
8 8 3 3 25
2 3 4
2 2