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12
6
If the diameters of the branch piping of the designated refrigerant
piping differs, use a pipe cutter to cut the connecting section and
then use an adapter for connecting different diameters to connect
the piping.
7
Always observe the restrictions on the refrigerant piping (such as
rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in
heating/cooling performance.
8
A second branch cannot be made after a header. (These are shown
by
.)
A
A
To Outdoor Unit
B
Sealed Piping
A
9
The Multi V will stop due to an abnormality like excessive or
insufficient refrigerant. At such a time, always properly charge the
unit. When servicing, always check the notes concerning both the
piping length and the amount of additional refrigerant.
10
Never perform a pump down. This will not only damage the
compressor but also deteriorate the performance.
11
Never use refrigerant to perform an air purge. Always evacuate air
by using a vacuum pump.
12
Always insulate the piping properly. Insufficient insulation will
result in a decline in heating/cooling performance, drip of
condensate and other such problems.
13
When connecting the refrigerant piping, make sure the service
valves of the Outdoor Unit is completely closed (the factory
setting) and do not operate it until the refrigerant piping for the
Outdoor and Indoor Units has been connected, a refrigerant
leakage test has been performed and the evacuation process has
been completed.
14
Always use a non-oxidizing brazing material for brazing the parts
and do not use flux. If not, oxidized film can cause clogging or
damage to the compressor unit and flux can harm the copper
piping or refrigerant oil.
WARNING
!
When installing and moving the air conditioner to another site, be
sure to make recharge refrigerant after perfect evacuation.
• If a different refrigerant or air is mixed with the original
refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.
• After selecting diameter of the refrigerant pipe to suit total
capacity of the indoor unit connected after branching, use an
appropriate branch pipe set according to the pipe diameter of the
indoor unit and the installation pipe drawing.
PIPE CONNECTIONS BETWEEN
INDOOR AND OUTDOOR UNIT
- Pipe connections can be done on the front side or on the side
according to the installation environments.
- Be sure to let 0.2 kgf/cm
welding.
- If Nitrogen was not flown during welding, many oxidized membranes
may form inside the pipe and disturb the normal operations of valves
and condensers.
Left Side
Pipe Draw
Out
Front Pipe Draw Out
Preparation Work
- Use Knock Outs of Base Pan of the outdoor unit for Left/Right or
B
Bottom pipe drawing outs.
Knock Out for
Liquid pipe
Removal area for pipes
bottom side connections.
CAUTION
!
• Do not give damage to the pipe/base during the Knock Out
work.
• Proceed to pipe work after removing burr after Knock Out work.
• Perform sleeve work to prevent damage to the wire when
connecting wires using Knock Outs.
2
(2.8 psi) Nitrogen flow in the pipe when
Refrigerant Pipe
Right
Side Pipe
Nitrogen
Nitrogen
Nitrogen
Draw Out
Direction
Direction
Direction
Taping
Knock Out for
Knock Out for
power supply cable
communication cable
Regulator
Valve
Nitrogen
Knock Out for
gas pipe
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