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Outdoor unit
Indoor unit
Indoor unit
The line branch pipe
H1
H2
L1
L2
Fig. 7.1
7
Refrigerant Piping Connection
Safety Precautions Notes On Pipe Length and Elevation
WARNING
All eld piping must be completed by a
licensed technician and must comply with the
local and national regulations.
When the air conditioner is installed in a small
room, measures must be taken to prevent
the refrigerant concentration in the room
from exceeding the safety limit in the event
of refrigerant leakage. If the refrigerant leaks
and its concentration exceeds its proper limit,
hazards due to lack of oxygen may result.
When installing the refrigeration system,
ensure that air, dust, moisture or foreign sub-
stances do not enter the refrigerant circuit.
Contamination in the system may cause poor
operating capacity, high pressure in the refrig-
eration cycle, explosion or injury.
Ventilate the area immediately if there is
refrigerant leakage during the installation.
Leaked refrigerant gas is both toxic and am-
mable. Ensure there is no refrigerant leakage
after completing the installation work.
Ensure that the length of the refrigerant pipe,
the number of bends, and the drop height be-
tween the indoor and outdoor units meets the
requirements shown in Table 7.1:
Table 7.1: The Maximum Length And Drop
Height Based on Models (Unit: m/ft.)
Type of model Capacity
(Btu/h)
Length of
piping
Maximum
drop height
North America,
Australia and the eu
frequency conversion
Split Type
<15K 25/82 10/32.8
>15K-<24K 30/98.4 20/65.6
>24K-<36K 50/164 25/82
>36K-<60K 65/213 30/98.4
Other Split Type
12K 15/49 8/26
18K-24K 25/82 15/49
30K-36K 30/98.4 20/65.6
42K-60K 50/164 30/98.4
Refrigerant Piping with Twin Indoor Units
When installing multiple indoor units with a single outdoor unit, ensure that the length of the re-
frigerant pipe and the drop height between the indoor and outdoor units meet the requirements
illustrated in the following diagram:
The drop height
between indoor
unit
and outdoor unit
must be less than
or equal to 20m
(65.6’)
The drop height
between two
indoor units must
be less than or
equal to 50cm
(19.6”)
19


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