Hitachi FSG Series, Technical Catalogue

Page: 320 / 424

13
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REFRIGERANT PIPING AND REFRIGERANT CHARGE
Indoor Unit No 0 1 2 3 4 5 6
Corresponding
Power (HP)
1 1 1 1 2 2 2
Additional
Refrigerant
Quantity
Indoor Unit which do not require the
additional charge*
1.4 1.4
ITEM LINE BRANCH SYSTEM
Example of Systems
This figure shows an example of 7 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
Lt
£
100 m
Maximum Piping
Length
Equivalent Length Lt
£
125 m
In the case that the position of outdoor unit
is higher than that of indoor unit.
H1
£
50 m
Maximum Lift
between
Outdoor Unit
and Indoor Unit
In the case that the position of outdoor unit
is lower than that of indoor unit.
H1
£
40 m
Maximum Lift between Each Indoor Unit, or Multi-Kit and indoor Unit H2
£
15 m
Maximum Lift among Indoor Unit connected to the same CH unit. H3
£
15 m
Maximum difference of piping length between each indoor
unit and same CH Unit.
-
Between Multi-Kit "a" and the Farthest
Indoor Unit
L
£
30 m
Between Each Multi-Kit and Each Indoor
Unit
L0 + L1, L5 + L7, L8 + L9, L10 + L11, L12 + L13
£
30 m
Maximum
Piping Length
between Multi-
Kit and Indoor
Unit
Between last multi-kit and the farthest
Indoor Unit
(*1) L2 + L3, L4 + L5
£
5 m
Outdoor Unit Use E-102ME at "a", "b" and "c", and E-88XE3 at "d"
CH-4.0GE -
CH-6.5GE -
Choice of each Multi-kit
In case of using indoor unit as exclusive cooling, use multi-kit of FSG .
Liquid
Line
Example: In case of RAS-10FXG
W11 = 61 x 0.120 = 7.3
W12 = (5 + 3 + 3 + 3 + 3) x 0.065 = 1.1
W13 = (2 + 4 + 2 + 4 + 2) x 0.026 = 0.4
Indoor
unit
*
: Select the "N" indoor Units in order from the smaller indoor unit (Refer to
Page 12-6). W2=1.4 + 1.4 = 2.8
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)
Total
W = W11 + W12 + W13 + W2
= 8.5 + 2.3 + 0.5 + 2.8 = 14.1 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)
Mark
Lt-
L6 L-L14-
L13
L6-
L5-L4
L0 L2 L4 L7 L9 L11 L13 L1 L3 L5 L8 L10 L12 L14
Size
Æ
12.7
Æ
9.53
Æ
6.35
Length 48 23 8 4 2 2 5 7 5 3 2 3 2 3 2 3 3
Outdoor Unit
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
Actual Lt
£
100m
Equivalent Lt
£
125m
L6
H3
£
4m
L
£
• 30m
H2
£
15m
H2
£
15m