Pipework - Kelvion TEC1 Installation And Maintenance Instructions Manual

Searle Air Cooler

7. PIPEWORK

Pipework to and from the cooler should be suitable for:
• Working fluid (guidance can be provided by Kelvion representative or pipe suppler)
• Atmospheric conditions
• Maximum operating pressure including relevant safety factor
Damage caused by incorrect installation will invalidate the
manufacturer's warranty obligations.
Pipework to and from the coolers should be selected to suit the application and not the connection size of the unit.
Pipework sizes should be selected to ensure pressure drop does not exceed an equivalent of 2K at full load conditions.
Pipework should be supported independently from the cooler unit in a way that prevents the transmission of vibration
to the units. A qualified engineer should install the refrigerant pipework to a high standard of refrigeration practice. All
pipework used must be clean and to refrigeration quality, all cuts should be made using a pipe cutter, never a hacksaw,
and care must be taken to remove all burrs and swarf.
Braze using silver bearing brazing rod and ensure that all joints are cleaned before brazing. During brazing care should
be taken to ensure that all components near joints should not be excessively overheated, a wet cloth should be applied
where necessary. Dry nitrogen should be passed through the pipework during brazing to minimise oxidisation.
WARNING!
Use appropriate PPE (personal protection equipment) during pipework, refrigerant charging
and commissioning. During brazing ensure the temperature of coils with vinyl coated fins does
not exceed 150°C as toxic fumes would be produced
When brazing and leak testing are complete the suction line should be insulated with 3/4" thick Class 'O' insulation. The
unit has been thoroughly tested during manufacture however after on site brazing is complete all pipework should be
pressure tested for leaks to maximum of 1.3 capacity pressure
Be aware of the below hazards during pipework and refrigerant charging:
Frost burns Heat burns
In the event of injury, seek medical attention immediately.
It is the responsibility of the installer to ensure piping to and from the condenser is suitable for the application, although
guidance from your Kelvion representative can be provided.
Unless otherwise specified, twin section units should be connected in parallel to each other, not in series; failure to do so
will result in excessive fluid pressure drop and a corresponding loss in performance.
All pipework and fittings should be pressure tested upon installation completion in accordance with relevant regulations
or legislations. Any pressure test should not exceed the units' maximum operating pressure or the pressure rating of any
safety devices.
Cuts or Wounds Inhalation