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6.3. Re turn air coo ler
F
A re turn air cooler is gen er ally re quired in cases in which the re turn air
tem per a ture is over 65 °C (149°F).
A re turn air coo ler im pro ves the ef fi cien cy of the dry ing cells.
The re turn air coo ler re du ces the re turn air tem pe ra tu re to a de fi ned va lue.
The re turn air tem pe ra tu re is set at the ope ra ti on pa nel.
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The lower the value cho sen for the re turn air tem per a ture, the better the
ef fi ciency of the dry ing cells.
The dryer is au to mat i cally switched off if tem per a ture ex ceeds 80 °C
(176°F.)
Re turn air tem pe ra tu re is con ti nu ous ly mo ni to red; the re turn air coo ler is ac ti vat ed only when nee -
ded. If the re turn air tem pe ra tu re ex ceeds the set va lue (e.g. due to in ter rup ti on in the coo ling wa -
ter supp ly or soi ling), an alarm mes sa ge is gi ven.
The re turn air coo ler can be con nec ted to a coo lant cir cuit or to the wa ter mains net work.
026-2MS
STT 500
Functio nal des crip ti on 6-4