7 - INSTALLATION AND START UP
Two tubes arranged together
fig. 9
7.8.3 Insulating the refrigerant tubing (fig. 9)
Thermal insulation should be applied to all pipes in the unit, including
connection points.
For the gas line use insulating agents resistant to at least 120°C or higher temperatures; for all other pipes, a resistance
of up to 80°C is sufficient.
The thickness of the insulation must be at least 10mm or higher. Increase the thickness if the thermoigrometric
conditions inside the pipe
passage cavity exceed 30°C b.s. - 70% u.r. Also isolate flare connections by creating an
insulating sleeve of thickness equivalent to that of
the pipeline, fixing it with a special tape.
Flare insulator
Insulation tape (white)
Flare union
Unit side
Flare nut
Tube insulator
(not supplied)
Heat resistant
Insulation
Liquid tubing
Gas tubing
7.8.2 Welding joint cautions
• Replace air inside the tube with nitrogen gas to prevent copper oxide
film from forming during the brazing process.
(Oxygen, carbon dioxide and Freon are not acceptable.)
• Use a reducing valve for the nitrogen cylinder.
• Do not allow the tubing to get too hot during brazing. The nitrogen
gas inside the tubing may overheat, causing
refrigerant system valves to become damaged. Therefore allow the tubing to cool when
brazing.
• Do not use agents intended to prevent the formation of oxide film.
These agents adversely affect the refrigerant and
refrigerant oil, and
may cause damage or malfunctions.
• Repeat the previous procedures for the second connection.
pag. 22
Summary of Contents for KRE-1500DX1
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