Technibel CAFM1V Series Technical Data Manual page 23

2. System Design
Table 2-10 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Items
Allowable tubing
length
Allowable elevation
2
difference
L = Length, H = Height
WARNING
2-10. Check of Limit Density
When installing an air conditioner in a room, it is nec-
essary to ensure that even if the refrigerant gas acci-
dentally leaks out, its density does not exceed the
limit level for that room.
If the density could exceed the limit level, it is neces-
sary 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: kg)
(Min. indoor volume where the indoor unit is installed: m
≤ Limit density 0.3 (kg/m
The limit density of refrigerant which is used in this
3
unit is 0.3 kg/m (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 refrig-
erant charge amount at shipment, refer to the unit's
nameplate.)
CAUTION
Marks
L1 Max. tubing length
Difference between max. length and min .
L (L2 – L3)
length from the No.1 distribution joint
, ~
Max. length of each distribution tube
1 2 n
Total max. tubing length including length of
+ +~
+L1
1 2 n–1
each distribution tube (only liquid tubing)
When outdoor unit is installed higher than indoor unit
H1
When outdoor unit is installed lower than indoor unit
H2 Max. difference between indoor units
Always check the gas den-
sity limit for the room in
which the unit is installed.
3
3 )
Pay special attention to
any location, such as a
basement, etc., where leak-
ing refrigerant can accu-
mulate, since refrigerant
gas is heavier than air.
Design of Mini Multiset
Contents
Actual length
Equivalent length
Minimum indoor volume & floor area as against the
amount of refrigerant is roughly as given in the follow-
ing table.
2 3
m m
100 270.0
95 256.5
90 243.0
85 229.5
80 216.0
75 202.5
70 189.0
65 175.5
60 162.0
)
55 148.5
50 135.0
45 121.5
40 108.0
35 94.5
30 81.0
25 67.5
20 54.0
15 40.5
20
2 - 16
Length (m)
>
150
>
175
>
40
>
30
>
200
>
50
>
40
>
15
Range below the
density limit of
3
0.3 kg/m
(Countermeasures
not needed)
Range above the
density limit of
3
0.3 kg/m
(Countermeasures
needed)
30 40 50 60 70 80 kg
Total amount of refrigerant