E-
22
Installing the Refrigerant Pipe Work (Continued)
Insulating the Refrigerant Pipe
You must check if there is a gas leak before completing all the installation process.
Use EPDM insulation which meets the following condition.
Item
Unit
Standard
Remarks
Density
g/cm²
0.048~0.096
KSM 3014-01
Dimension change route by heat
%
-5 or less
Water absorption rate
g/cm²
0.005 or less
Thermal conductivity
kcal/m·h·˚C
0.032 or less
KSL 9016-95
Moisture transpiration factor
ng/(m²·s·Pa)
15 or less
KSM 3808-03
Moisture transpiration grade
{g/(m²·24h)}
15 or less
KSA 1013-01
Formaldehyde dispersion
mg/L
-
KSF 3200-02
Oxygen rate
%
25 or less
ISO 4589-2-96
Insulating the refrigerant pipe
Be sure to insulate the refrigerant pipe, joints and connections with class 'o' material.
If you insulate the pipes, the condensed water does not fall from the pipes and the
capacity of the Air to water heat pump is improved.
Check if there are any insulation cracks on the bent pipe.
Insulation
Gas side pipe
Liquid side pipe
Indoor unit
Clamp
Insulation
Install the insulation
to be overlapped
Indoor unit
Overlapped
Brazing the Pipe
Make sure that there is no moisture inside the pipe.
Make sure that there are no foreign materials and impurities in the pipe.
Replacement of Nitrogen gas
1
Use oxygen free nitrogen gas when brazing the pipes as
shown in the picture.
2
If you do not use Nitrogen gas when brazing the pipes,
oxidation may form in the pipe. It can cause the damage of
the compressor and valves.
3
Adjust the flow rate of the replacement with a pressure
regulator to maintain 0.05m
3
/h or more.
4
Perform brazing of the service valve after protecting the valve.
Brazing part
Nitrogen gas
1/4" copper pipe
Valve stem
Taping
Pressure regulator
RD060PHXEA_IM_E_32352A(2).indd 22
2010-07-26 ｿﾀﾈﾄ 2:19:57
