In harsh environments involving high temperatures, wash-down requirements, heavy particulate matter or the presence of chemicals capable of damaging components (NEMA 4 or 12 environments), ambient air must be kept out of the enclosure.

Pfannenberg Cooling Units seals out the ambient air, cooling and re-circulating clean, cool air throughout the enclosure.

When are cooling units necessary?

  • If cooling cannot be accomplished by the outside air.
  • If the temperature required inside the electrical cabinet should be equal to or lower than the ambient temperature.
  • If the ambient air is strongly contaminated with oil or conductive dusts.
  • When higher ingress protection is required (Type rating).

Important for the use of Cooling Units:

  • Ensure a good supply of air intake and outtake from the external circuit of the cooling unit, so that thermal energy can be transferred to the surroundings.
  • The lowest temperature inside the enclosure may not necessarily be the best. The 95 °F (35 °C) preset by Pfannenberg represents a good compromise between service life and the accumulation of condensation.
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