Technical Data Manual

Design of Mini VRF SYSTEM
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2. System Design
CAUTION
Pay special attention to any
location, such as a base-
ment, etc., where leaking
refrigerant can accumulate,
since refrigerant gas is
heavier than air.
Table 2-11 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Items Marks Contents Length (ft.)
L1 Max. tubing length
Actual length 492
Equivalent length 574
L (L2 – L3)
Difference between max. length and min.
131
length from the No.1 distribution joint
1
,
2
...
n
Max. length of each distribution tube 98
1
+
2
+...
n - 1
Total max. tubing length including length of
656
each distribution tube (only narrow tubing)
H1
When outdoor unit is installed higher than indoor unit 164
When outdoor unit is installed lower than indoor unit 131
H2 Max. difference between indoor units 49
L = Length, H = Height
Allowable tubing
length
>
>
Allowable elevation
difference
>
>
>
>
>
>
+L1
LA
Max. length of main tubing (at max. diameter)
262
>
WARNING
Always check the gas den-
sity limit for the room in
which the unit is installed.
2-10. 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.
TD831156-00_MINI_VRF_SYS.indb 16TD831156-00_MINI_VRF_SYS.indb 16 2012/01/31 14:38:452012/01/31 14:38:45