•
(12)
For operations in refrigeration mode only, connect the indoor units using gas and liquid pipes (without the
CH unit). The total capacity in refrigeration mode only must be less than 50% the total capacity of the indoor
units.
•
(13)
The installation conditions for the refrigerant pipes are different depending on the number of indoor units
connected.
•
(14)
The total pipe length permitted must be less than 1000 m due to the maximum additional refrigerant charge
limitation.
•
(15)
Where the branch is after the CH unit and the capacity of the connected indoor unit is (0.8-1.5) HP, use a
15.88 mm diameter for the gas pipe.
N O T E
1 Check that the gas pipe and the liquid pipe are equivalent in terms of length and installation system.
2 Use the multikit system for branching of the indoor units and the CH unit.
3 Install the indoor unit, the multikit and the CH unit according to the instructions given in this manual.
4 Where the length of pipe L3 between each multikit and each indoor unit is considerably longer than on another
indoor unit, the refrigerant will not flow correctly and performance is lower in comparison with other models
(recommended pipe length: up to 15 m).
Pipe branching restrictions
Follow the instructions given in the table below for pipe installation (field-supplied).
Maximum pipe length
between the multikit of the
first branch and each
indoor unit (L2)
Main pipe branch
(1)
Capacity ratio of the
indoor units after the
main branch
Branch and distributor
combination
Pipe length after the
branch
Number of main pipe
branches
≤
40 m
a+b+c
≤
30 m or d+e
+f
≤
30 m
No limit
—
Available (Figures 3 and 4)
a+b+c > 30 m or d+e
+f > 30 m
Up to 2
From 41 m to 90 m
—
Up to 1 (Figure 1)
≥
40% (Figure 2)
Not available
N O T E
(1)
Main pipe branch: distribution from one (1) multikit to two (2) multikits.
d
e
f
a
b
c
B
A
B
B
B
A: main branch
B: indoor units
3 Piping work and
refrigerant charge
57
SMGB0065 rev. 1 - 12/2010
3
