Immergas AUDAX PRO 4 V2 - Choose the Insulation of the Refrigerant Pipe; Insulating the Refrigerant Pipe; Braze Welding the Pipe

42
43
44
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8.5 CHOOSE THE INSULATION OF THE
REFRIGERANT PIPE.
- Select the appropriate insulations according to the size of the gas
and liquid pipes.
- e standard conditions are with a temperature of 30° C and a
humidity of 85%. If the units are installed in extreme climatic
conditions, select the insulation from the table in gure 42.
ATTENTION:
- apply the insulation in such a way
that it does not expand and use the
adhesives on the relative connection part to
keep out moisture.
- Wrap the refrigerant pipe in insulating tape
if it is exposed to external sunlight.
- Install the refrigerant pipe making sure that
the insulation is not thinner on bends or in
the fairlead.
Type of pipe Pipe diameter (mm)
Insulation thickness
Notes
Normal
(Below 30°C, 85 %)
High humidity
(Over 30°C, 85 %)
EPDM, NBR
Liquid ø 6.35 ~ ø19.05 9 9
e m
aterial must be
a
ble to withstand heat
beyond 120°C
Gas ø15.88 19 25
Item Unit Standard Notes
Density g/cm 0.048 ~ 0.096
KSM 3014-01Path dimensions changed by heat % -5 or less
Water absorption rate g/cm 0.005 or less
er
mal conductivity kc
al/m·h·˚C 0.032 or less KSL 9016-95
Moisture transpiration factor ng/(m
·s·Pa) 15 or less KSM 3808-03
Moisture transpiration degree {g/(m·24h)} 15 or less KSA 1013-01
Dispersion of formaldehyde mg/l - KS
F 3200-02
Oxygen rate % 25 or less ISO 4589-2-96
8.6 INSULATING THE REFRIGERANT PIPE.
- You must check that there are no gas leaks before completing
the entire installation process.
- Use EPDM insulation which meets the conditions described in
the table in gure 43.
- Make sure to insulate the refrigerant pipes, the joints and the
connections with class ‘o’ material.
- By insulating the piping, condensate water does not drip from
the pipes, improving the condensing unit’s capacity.
- Check that there are no cracks in the insulation where the pipe bends.
8.7 BRAZE WELDING THE PIPE.
- Make sure there is no moisture inside the pipe.
- Make sure there are no foreign bodies or impurities in the pipe.
Replacing nitrogen gas.
1. Use oxygen-free nitrogen during braze welding of the pipes, as
shown in gure 44.
2. Oxidation can form in the pipe if nitrogen gas is not used dur-
ing braze welding. is can damage the compressor and valves.
3. Adjust the ow of the replacement gas with a pressure regulator
to maintain the ow rate no lower than 0.05 m3/hour.
4. Execute braze welding of the service valve aer having protected
the valve.
Insulation
Clamp
Indoor unit
Gas side pipe
Liquid side
pipe
Indoor
unit
Insulation
Install insulation to
overlap
Overlap
Part to
braze weld
1/4" copper pipe
Pressure regulator
Stem
valve
Touch
Nitrogen gas