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English
Instal
lation Pr
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Step 8 Performing the gas leak test
To identify potential gas leaks on the indoor unit, inspect
the connection area of each refrigerant pipe using a leak
detector for R-410A.
Before recreating the vacuum and recirculating the
refrigerant gas, pressurize the whole system with
nitrogen (using a cylinder with a pressure reducer) at a
pressure above 0.2 MPa, less than 4 MPa (gauge) in order
to immediately detect leaks on the refrigerant fittings.
Made vacuum for 10 minutes and pressurizing system
with nitrogen.
Liquid side
Gas side
Insulator
Step 9 Insulating the refrigerant pipes
Once you have checked that there are no leaks in the
system, you can insulate the piping and hose.
1
To avoid condensation problems, place Acrylonitrile
Butadien Rubber separately around each refrigerant pipe.
No gap
NBR
NOTE
•
Always make the seam of pipes face upwards.
2
Wind insulating tape around the pipes and drain hose
avoiding compressing the insulation too much.
Insulation cover pipe
Insulation pipe
Be sure to overlap the insulation.
Indoor unit
CAUTION
•
Be sure to wrap insulation tightly without any gaps.
3
Finish wrapping insulating tape around the rest of the
pipes leading to the outdoor unit.
4
The pipes and electrical cables connecting the indoor
unit with the outdoor unit must be fixed to the wall
with suitable ducts.
CAUTION
• Make sure that all refrigerant connection must be
accessible for easy maintenance and detachment.
•
Install the insulation not to get wider and use the
adhesives on the connection part of it to prevent
moisture from entering.
•
Wind the refrigerant pipe with insulation tape if it is
exposed to outside sunlight.
•
Install the refrigerant pipe respecting that the
insulation does not get thinner on the bent part or
hanger of pipe.
•
Add the additional insulation if the insulation plate
gets thinner.
a x 3
Hanger
Additional insulation
a
Refrigerant pipe
insulation
5
Select the insulation of the refrigerant pipe.
• Insulate the gas side and liquid side pipe, noting
the insulation thickness that must differ according
to the pipe size.
•
Standard: Less than an indoor temperature
of 30°C, with humidity at 85%. If installing in
a high humidity environment, use one grade
thicker insulator by referring to the table below.
If installing in an unfavourable environment, use
thicker one.
•
The heat-resistance temperature of the insulator
must be more than 120°C.