25
PMML0628 rev.0 - 05/2023
3
PIPE CONNECTION
PIPING WORK AND REFRIGERANT CHARGE
◆ Example 2: Using piping connecon kit
Outdoor
Unit
A
Outdoor
Unit
B
Indoor
Unit
Indoor
Unit
First Branch
Mul-Kit
Piping Connecon Kit
d
e
f
g
h
A B
3.3 Pipe connecon
Cover the end of the pipe appropriately when needs to be inserted through holes in walls and
roofs, etc.
Keep the ends of the pipes covered while other installaon work is being carried out to avoid the
entry of dampness or dirt.
Do not place the pipes directly on the ground without appropriate protecon or adhesive vinyl
tape to cover the ends.
Where the pipe installaon is not completed for a certain amount of me, braze the ends of
the pipe to seal. Then ll it with oxygen-free nitrogen gas through a Schrader valve to avoid the
accumulaon of humidity and/or contaminaon through dirt.
NOTE
• Where polyethylene foam insulaon is used, a 10mm thick layer should be used for the liquid
pipe and between 15 and 20 mm for the gas pipe.
• Install the insulaon aer the pipe surface temperature has dropped to the same temperature
as that of the room, otherwise the insulaon may melt.
Do not use insulang material that contains NH
3
(ammonium), as it could damage the copper in
the pipe and subsequently cause leaks.
Where the lter has supplied his own branches, these should be appropriately insulated to avoid
decreases in capacity in line with environmental condions and dew on the surface of the piping
due to low pressure.
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