Giatsu GIA-MDI-12IX43R32 Installation Manual page 56

Refrigerant Piping Connection
Safety Precautions
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
substances do not enter the refrigerant
circuit. Contamination in the system may
cause poor operating capacity, high
pressure in the refrigeration cycle,
explosion or injury.
• Ventilate the area immediately if there is
refrigerant leakage during the installation.
Leaked refrigerant gas is both toxic and
flammable. Ensure there is no refrigerant
leakage after completing the installation
work.
Refrigerant Piping with Twin Indoor Units
When installing multiple indoor units with a single outdoor unit, ensure that the length of the
refrigerant 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')
 Page 20 
Ensure that the length of the refrigerant pipe, the
number of bends, and the drop height between
the indoor and outdoor units meets the
requirements shown in Table 6.1:
Outdoor unit
L
H2
The line branch pipe
Fig. 6.1
Notes On Pipe Length and Elevation
Table 6.1: The Maximum Length And Drop
Height Based on Models. (Unit: m/ft.)
Type of model Capacity
(Btu/h)
<15K
North America,
Australia and the
≥15K - <24K
eu frequency
≥24K - <36K
conversion Split
Type
≥36K - ≤60K
12K
18K-24K
Other Split Type
30K-36K
42K-60K
Indoor unit
L1
The drop height
H1
L2
than or equal to
Indoor unit
6
Length of
Maximum drop
piping
height
10/32.8
25/82
30/98.4 20/65.6
50/164 25/82
65/213 30/98.4
15/49 8/26
25/82 15/49
20/65.6
30/98.4
30/98.4
50/164
between two
indoor units
must be less
50cm (19.6")