Hitachi FSG1 Series Technical Catalogue page 313

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
Quantity 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)
REFRIGERANT PIPING AND REFRIGERANT CHARGE
meters lift.
t
Provide oil trap to gas line at
every Ht meters lift
RAS-10FSG Use E-102ME1 at "a, b, c, d and e"
RAS-8FSG Use E-82ME1 at "a, b, c, d and e"
RAS-5FSG Use E-52ME1 at "a, b, c, d and e"
Example: In case of RAS-8FSG
Mark
Liquid Line Size
Length
W13 = 51 x 0.120 = 6.1
W15 = (5+3+5+3+5+3) X 0.026 = 0.6
Indoor Unit No
Corresponding
Power (HP)
Indoor unit Additional
Refrigerant
Quantity
W2 = 1.4
W = W11 + W12 + W13 + W14 + W15 + W2
Total
= 6.1 + 0 + 0.6 + 1.4 = 8.1 kg
LINE BRANCH UNI-PIPING SYSTEM
Outdoor Unit
H1£50m (Position of outdoor unit is higher)
H1£40m (Position of outdoor unit is Lower)
Actual Lt£100m
Equivalent Lt£125m
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
Lt+L-
L0 L1 L2
(L2+L4)
Ø12.7 Ø6.35 Ø6.35 Ø6.35
71 5 3 5
0 1 2
1 1 2
Indoor Unit which do not require the
additional charge
13
/37
L3 L4 L5
Ø6.35 Ø6.35 Ø6.35
3 5 3
3 4 5
2 2 2
1.4