Hitachi FSG Series, Технический каталог

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REFRIGERANT PIPING AND REFRIGERANT CHARGE
13
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ITEM LINE BRANCH SYSTEM
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.
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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
£
4 m
Maximum difference of piping length between each indoor
unit and same CH Unit.
L4 - L3
£
5 m
Between Multi-Kit "a" and the Farthest I.U.
L
£
30 m
Between Each Multi-Kit and Each I.U
L0, L1, L2, L3, L4
£
30 m
Maximum Piping
Length between
Multi-Kit and
Indoor Unit
Between last multi-kit and the farthest I.U. (*1) L5 + L6, L7 + L8
£
5 m
Outdoor Unit
Example: In case of RAS-20FXG1:
Use E-242X at "a" and "b", E-82XME1 at "c"
CH-4.0GE Use E-42ME at "d".
CH-6.5GE Use E-52ME at "d".
CH-11.5G Use E-102ME1 at "d"
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-20FXG1
W10=40 x 0.390, W11=10 x 0.3, W12=15 x 0.12,
W13=14 x 0.065, W14= 3 x 0.026
W1= 15.6+3+1.8+0.91+0.08 = 21.39 kg
Indoor Unit
Quantity of Additional Refrigerant Charge
The quantity is calculated by the following
equation:
W (kg) = W10+W11+W12+W13+W14+W2
1) W10 (kg): (Total Length (m) of Ø22.2
Liquid Piping) x 0.390
W11 (kg): (Total Length (m) of Ø19.5
Liquid Piping) x 0.300
W12 (kg): (Total Length (m) of Ø12.7
Liquid Piping) x 0.120
W13 (kg): (Total Length (m) of Ø9.53
Liquid Piping) x 0.065
W14 (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 = W1 + W2 = 21.39 + 4.3 = 25.69 kg
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
H3
£
4m
L
£
30m
Actual Lt
£
100m
Equivalent Lt
£
125m
Mark Lt - L LM1 LM2 + L2
L0+L1+L3+
L4+L5+L6+L7
L8
Size Ø22.2 Ø19.5 Ø12.7 Ø9.53 Ø6.35
Length 40 10 15 14 3
Indoor Unit No.. 0 1 2 3 4
Corresponding
Power (HP)
2 4 4 5 5
Additional
refrigerant
Quantity
Indoor Unit which do not require the
additional charge
4.3
W2 = 4.3 kg
LM1 LM2