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If the unit ope ra tes with a re turn air coo ler (op tio nal):
Re turn air cooler Tar get
En ter the max. per mis si ble re turn air tem per a ture (65 °C max.) (149°. F) Higher tem per a tures are
not al lowed. Ac knowl edge with the EN TER-key.
Re turn air coo ler Act.
The cur rent re turn air tem pe ra tu re will be dis play ed.
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The coo ling ef fect of the re turn air coo ler is highly de pen dent on the coo -
ler cir cuit.
The lo wer the va lue cho sen for the re turn air tem pe ra tu re, the bet ter the
ef fi cien cy of the dry ing cells.
F
Plan the size of the coo lant cir cuit ac cor ding ly.
Press the ”F1"-key.
026-2MS
STT 500
Start-up 3-10