Hitachi FSG1 Series Technical Catalogue page 316

REFRIGERANT PIPING AND REFRIGERANT CHARGE
13
/40
ITEM
Example of Systems
This figure shows examples of 6 indoor units combined
with one outdoor unit.
The refrigerant pipes are shown as single line in the
diagrams.
However, liquid line piping and gas line piping are required
in the field.
?
NOTE:
Provide oil trap to gas line at every H
(H is indicated in chapter 13.1.1)
t
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 Between Multi-Kit "a" and the Farthest
Piping Length Indoor Unit
between Multi-
Between Each Multi-Kit and Each Indoor
Kit and Indoor
Unit
Unit
Choice of each Multi-kit
Refer to item 13.1.3 at piping size and Multi-kit for selection
of the piping size for the multi-kit.
Quaintly of Additional Refrigerant Charge
The quantity is calculated by the following
equation:
W (kg) = W11+W12+W13+W14+W15+W2
1) W11 (kg): (Total Length (m) of Ø19.05
Liquid Piping) x 0.300
W12 (kg): (Total Length (m) of Ø15.88
Liquid Piping) x 0.195
W13 (kg): (Total Length (m) of Ø12.7
Liquid Piping) x 0.120
W14 (kg): (Total Length (m) of Ø9.53
Liquid Piping) x 0.065
W15 (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)
meters lift.
t
H1£50m
(Position of outdoor unit is higher)
H1£40m
(Position of outdoor unit is Lower)
Example: In case of RAS-20FSG
Mark
Multi-Kit
Example: In case of RAS-20FSG
Mark LM1
Ø15.88
Size
Liquid
Length 50
Line
W11 = 0, W12 = 50 x 0.195 = 9.8, W13 = (20+20) x 0.120 = 4.8
W14 = (5+3) x 0.065 = 0.5, W15 = (5+3+5+3) x 0.026 = 0.4
Example: In case of RAS-20FSG
Indoor Unit No
Corresponding
Power (HP)
Indoor unit
Additional
Refrigerant
Quantity
W2 = 2.3 x 2 = 4.6
W (kg) = W11+W12+W13+W14+W15+W2
Total
= 0 + 9.8 + 4.8 + 0.5 + 0.4 + 4.6 = 20.1 kg
LINE BRANCH DOWN-SIZE SYSTEM
Provide oil trap to gas line at every Ht meters lift
Outdoor Unit
Lt £ 100 m
Lt £ 125 m
H1 £ 50 m
H1 £ 40 m
H2 £ 15 m
L £ 30 m
L0, L1, L2, L3, L4 £ 30 m
a b
E-202M1 E-102ME
LM2 LM3 L0 L1
Ø12.7 Ø12.7 Ø9.53 Ø9.53
20 20 5 3
0 1
2 2
Indoor Unit which do not
require the additional charge
Actual Lt£100m
Equivalent Lt£125m
c, d e
E-82ME E-86SE3
L4
L2 L3 L5
Ø6.35 Ø6.35 Ø6.35 Ø6.35
5 3 5 3
2 3 4 5
4 4 4 4
2.3 2.3