45MBDAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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D. CONNECT THE REFRIGERANT PIPES
REFRIGERANT PIPING CONNECTION
When connecting refrigerant piping, DO NOT let substances or gases
other than the specified refrigerant enter the unit. The presence of other
gases or substances will lower the unit’s capacity, and can cause
abnormally high pressure in the refrigeration cycle. This can cause
explosion and injury.
Notes on Pipe Length and Elevation
Table 15 — Maximum Length and Drop Height Based on
Models (Low Static)
Table 16 — Maximum Length and Drop Height Based on
Models (High Static)
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 the table next to it.
Step 1: Cut Pipes
When preparing refrigerant pipes, take extra care to cut and flare them
properly. This will ensure efficient operation and minimize the need for
future maintenance.
• Measure the distance between the indoor and outdoor units.
• Using a pipe cutter, cut the pipe a little longer than the measured
distance.
• Ensure that the pipe is cut at a perfect 90° angle.
IMPORTANT: Do not deform the pipe while cutting. Be extra careful
not to damage, dent, or deform the pipe while cutting. This will
drastically reduce the heating.
Fig. 55 —Correct and Incorrect Pipe Cutting
Step 2: Remove Burrs
Burrs can affect the air-tight seal of refrigerant piping connection. They
must be completely removed.
• Hold the pipe at a downward angle to prevent burrs from falling into
the pipe.
• Using a reamer or deburring tool, remove all burrs from the cut
section of the pipe.
Fig. 56 —Remove Burrs
Step 3: Flare Pipe Ends
Proper flaring is essential to achieve an airtight seal.
• After removing burrs from cut pipe, seal the ends with PVC tape to
prevent foreign materials from entering the pipe.
• Sheath the pipe with insulating material.
• Place flare nuts on both ends of pipe. Make sure they are facing in the
right direction, because you can not put them on or change their
direction after flaring.
Fig. 57 —Flare Nut
MODEL LENGTH OF PIPING
MAXIMUM DROP
HEIGHT
06K & 09K/12K 82 ft/25 m 49.2 ft/15 m
18K 98.4 ft/30 m 65.6 ft/ 20 m
MODEL LENGTH OF PIPING
MAXIMUM DROP
HEIGHT
9K/12K 82ft/25m 49.2ft/15m
18K 98.4ft/30m 65.6ft/20m
24K 164ft/50m 82ft/25m
36K/48K/60K 246ft/75m 98.4ft/30m
UNIT DAMAGE HAZARD
The branching pipe must be installed horizontally. An angle of more
than 10° may cause malfunction.
DO NOT install the connecting pipe until both indoor and outdoor
units have been installed.
Insulate both the gas and liquid piping to prevent condensation.
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