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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
Minimum indoor volume & floor area as against
the amount of refrigerant is roughly as given in the
following table.
the amount of refrigerant is roughly as given in the
following table.
CAUTION
Pay special attention to any location, such as a basement, etc., where
leaking refrigerant can accumulate, since refrigerant gas is heavier than air.
leaking refrigerant can accumulate, since refrigerant gas is heavier than air.
Table 1-10 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
L = Length, H = Height
Always check the gas density limit for the room in which the
unit is installed.
unit is installed.
WARNING
1-12. Check of Limit Density
When installing an air conditioner in a room, it is
necessary to ensure that even if the refrigerant gas
accidentally leaks out, its density does not exceed the
limit level for that room.
If the density could exceed the limit level, it is
necessary to provide an opening between the unit
and the adjacent room, or to install mechanical
ventilation which is interlocked with the leak detector.
(Total refrigerant charged amount: k
g)
(Min. indoor volume where the indoor unit is installed: m
3
)
< Limit density 0.3 (k
g/m
3
)
The limit density of refrigerant which is used in this
unit is 0.3 k
unit is 0.3 k
g/m
3
(ISO 5149).
The shipped outdoor unit comes charged with the
amount of refrigerant fixed for each type, so add it
to the amount that is charged in the field. (For the
refrigerant charge amount at shipment, refer to the
unit’s nameplate.)
40.5
54.0
27.0
13.5
13.5
0.0
20
10
0
30
40
60
70
80
90 100
50
67.5
81.0
94.5
108.0
121.5
135.0
148.5
162.0
175.5
189.0
202.5
216.0
229.5
243.0
256.0
270.0
m
2
m
3
15
10
10
5
0
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
283.5
297.0
310.5
324.0
337.5
k
g
Range below the
density limit of
0.3 k
density limit of
0.3 k
g/m³
(Countermeasures
not needed)
not needed)
Range above the
density limit of 0.3
k
density limit of 0.3
k
g/m³
(Countermeasures
needed)
needed)
Total amount of refrigerant
Min. indoor volume
Min. indoor floor area
(when the ceiling is 2.7 m high)
Items
Marks
Contents
Length (m)
Allowable tubing
length
length
L1
Max. tubing
length
length
Actual length
≤ 120
Equivalent length
≤ 140
ΔL (L2 – L3)
Difference between max. length and min.
length from the No.1 distribution joint
length from the No.1 distribution joint
≤ 40
1
,
2
...
n
Max. length of each distribution tube
≤ 30
1
,
2
...
n-1
+L1
Total max. tubing length including length of each
distribution tube (only narrow tubing)
distribution tube (only narrow tubing)
≤ 150
Allowable elevation
difference
difference
H1
When outdoor unit is installed higher than indoor unit
≤ 50
When outdoor unit is installed lower than indoor unit
≤ 40
H2
Max. difference between indoor units
≤ 15
TD831155-04_MINI VRF.indb 7
TD831155-04_MINI VRF.indb 7
2014/05/09 15:29:02
2014/05/09 15:29:02
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