Installation manual

11
ENGLISH
To identify potential gas leaks on the indoor unit, inspect the connection area of each refrigerant
pipe using a leak detector for R410A.
Before recreating the vacuum and recirculating the refrigerant gas, it is advisable to pressurize the
whole system with nitrogen (using a cylinder with pressure reducer) at a pressure above 40 bar in
order to immediately detect leaks on the refrigerant ttings.
Made vacuum for 15 minutes and pressurising system with nitrogen.
• If the pipes require brazing ensure that OFN (Oxygen Free Nitrogen) is owing through the system.
Leak test
Performing leak test & insulation
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.
2 Wind insulating tape around the pipes and drain hose avoiding to compress
the insulation too much.
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 xed to the wall with suitable ducts.
5 Select the insulation of the refrigerant pipe.
 
Insulate the gas side and liquid side pipe referring to the thickness
according to the pipe size.
  Less than indoor temperature of 30°C and humidity of 85% is the standard
condition. If installing in a high humidity condition, use one grade thicker insulator by referring to the table below.
If installing in an unfavorable conditions, use thicker one.
 
Insulator’s heat-resistance temperature should be more than 120°C.
Insulation
No gap
NBR
Insulation cover pipe
Indoor unit
Be sure to overlap
the insulation
Insulation pipe
• Must t tightly against
body without any gap.
• Always make the seam of pipes face upwards.
• All refrigerant connection must be accessible, in order to permit
either unit maintenance or removing it completely.
Pipe Pipe size
Insulation Type (Heating/Cooling)
RemarksStandard [Less than 30°C, 85%] High humidity [Over 30°C, 85%]
EPDM,NBR
Liquid
pipe
Ø6.35 ~ Ø9.52 9t 9t
Internal temperature is
higher than 120°C
Ø12.7 ~ Ø19.05 13t 13t
Gas
pipe
Ø6.35 13t 19t
Ø9.52
19t 25t
Ø12.70
Ø15.88
Ø19.05
• The insulation has to be produced in full compliance of European
regulation reg. EEC / EU 2037/ 2000 that
requires the use of sheaths insulation form without using CFC and
HCFC gases for health and the environment.
NS＊＊＊4PXEA_IM_E_32787A(8).indd 11 2012-10-18 오후 2:11:40
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