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refrIGerAnT PIPInG & refrIGerAnT CHArGe
8 REFRIGERANT PIPING & REFRIGERANT CHARGE
8.1 PIPING MATERIALS
1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct
material which can have sufficient pressure strength.
3 Select clean copper pipes. make sure there is no dust and
moisture inside. Blow the inside of the pipes with oxygen
free nitrogen to remove any dust and foreign materials
before connecting pipes.
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N O T E
•
A system with no moisture or oil contamination will give maximum
performance and lifecycle compared to that of a poorly prepared
system. Take particular care to ensure all copper piping is clean and
dry internally.
•
There is no refrigerant in the cycle of the indoor unit.
8.2 PIPING CONNECTION FOR OUTDOOR UNIT
1 The pipes can be connected from 4 directions. make holes
in the piping cover or cabinet for taking out pipes. Take the
piping cover away from the unit, and make holes by cutting
along the guideline at the rear of the cover or punching
with a driver. remove the burr with a cutter, and place a
insulation (field supplied) to protect cables and pipes.
Nº
rear side piping work
Pipe Cover
right side piping work
Bottom side piping work (Knock out hole)
front side piping work
Piping work
Stop Valve
removing Direction for Service Cover
(picture as example)
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C A U T I O N
Notes to open/close the service cover:
•
Remove the screws following the instructions to the above figure.
•
Slowly press down the cover.
10
PMML0395B rev.3 - 05/2019
Description
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C A U T I O N
•
Cap the end of the pipe when pipe is to be inserted through a hole.
•
Do not put pipes on the ground directly without a cap or vinyl tape at
the end of the pipe.
•
If piping installation is not completed until next day or over a longer
period of time, braze off the ends of the piping and charge with
oxygen free nitrogen through a Schrader valve type access fitting to
prevent moisture and particle contamination.
•
Do not use insulation material that contains NH
damage cooper pipe material and can be a source of future leakage.
•
Completely insulate both refrigerant gas piping and liquid piping
between the indoor unit(s) and the outdoor unit.
•
If not insulated, dew will occur on the piping surface.
?
N O T E
Hold the cover with a hand to remove screws as the cover may fall down.
(picture as example)
a. for the front and side piping
To use racking or conduit tubes, check the size and
remove
part following the slit.
?
N O T E
Place insulation (field supplied) to protect cables and pipes from
being damaged by plate edges.
because it can
3
Service cover
Clasp (3 places)
front piping hole
Side piping hole
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