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Installation Procedure
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 4 MPa in order to immediately detect
leaks on the refrigerant fittings.
Made vacuum for 15 minutes and pressurizing system
with nitrogen.
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
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.
Indoor unit
12
English
Gas side
Liquid side
NBR
Insulation cover pipe
Insulation pipe
Be sure to overlap
the insulation.
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.
Additional insulation
a
a x 3
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.
Hanger
Refrigerant pipe insulation
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