Selecting Chiller Line Insulation; Insulating The Chiller Lines; Welding The Pipes; Using Nitrogen - Immergas AUDAX PRO 5 Instruction And Recommendation Booklet

5.3 SELECTING CHILLER LINE
INSULATION.
- The gas and liquid chiller lines must be insu-
lated with materials selected based on their
respective diameters.
- Standard insulation is required at a temperature
of 30°C with 85% relative humidity. Should the
thermohygrometric conditions of the air be
harsher, you must use insulations that can be
selected from the table in figure 5-7
- Attention:
- The insulation cannot be interrupted and for
this reason, its junctions must be sealed with
adhesive to prevent moisture from getting in.
- Should the insulation be exposed to sunlight,
it must be protected by wrapping it with elec-
trical tape or material suitable for this type of
application.
- The insulation must be laid without its thick-
ness being reduced in the bends and supports
of the pipes.
Line
Liquid
Gas
5-7
Density
Dimensional variation due to temper-
ature changes
Moisture permeability
Thermal conductance
Moisture transpiration factor
Moisture transpiration degree
Formaldehyde release
Oxygen rate
5-8
Insulation
Indoor
unit
Gas pipe
Liquid pipe
5-9

5.4 INSULATING THE CHILLER LINES.

- The insulation must only be laid after having
made sure that there are no coolant leaks on
the lines.
- Use EPDM insulation with the features de-
scribed in the table in figure 5-8.
- The chiller lines, the junctions and the connec-
tions must be insulated with class "0" (zero)
material.
- Proper insulation prevents condensate from
forming on the surface of the pipes and protects
heat pump performance and the level of user
satisfaction.
- Make sure that the insulation is not broken and/
or interrupted in the pipe bends (Fig. 5-9).
Standard conditions
Pipe diameter
(Less than 30°C, RH
(mm)
85%)
Ø 6.35 ÷ 19.05 9
Ø 12.70 ÷ 19.05 13
Ø 6.35 13
Ø 9.52
Ø 12.70
19
Ø 15.88
Ø 19.05
Item
kcal/m·h·˚C
ng/(m²·s·Pa)
{g/(m²·24h)}
Clip
Indoor
unit
Insulation thickness
High humidity condi-
tions
(Over 30°C, RH 85%)
EPDM, NBR
9
13
19
25
Unit Standard Value
g/cm² 0.048 ÷ 0.096
% ≤ -5
g/cm² ≤ 0.005
≤ 0.032
≤ 15
≤ 15
mg/L -
% ≤ 25
Insulation
Overlapped
The insulation must com-
pletely overlap the pipes
17 17

5.5 WELDING THE PIPES.

- Make sure there is no moisture inside the pipes
- Make sure there are no foreign objects inside
the pipes.

5.6 USING NITROGEN.

1 Welding must be done in a nitrogen atmos-
phere, that is, insufflating the pipes with
nitrogen as shown in figure 5-10.
2 Should welding be done without insufflating
nitrogen, flakes of rust would form inside
the pipes. In coming loose, these flakes could
damage the compressor and the valves.
3 The flow of nitrogen must be controlled, cali-
brating the pressure regulator so as to obtain a
flow of at least 0.05 m /h.
3
4 The valves must be protected from heat while
they are being welded.
Notes
The pre-selected
material must be able to
withstand temperatures
exceeding 120°C.
Notes
KSM 3014-01
KSL 9016-95
KSM 3808-03
KSA 1013-01
KSF 3200-02
ISO 4589-2-96
Taping
1/4" copper
Part to
pipe
weld
Nitrogen
Valve stem
Pressure
regulator
5-10