STT 500
6.3. Return air cooler
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A return air cooler is generally required in cases in which the return air temperature is over 65 °C (149°F).
A return air cooler improves the efficiency of the drying cells.
The return air cooler reduces the return air temperature to a defined value. The return air temperature is set at the operation panel.
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The lower the value chosen for the return air temperature, the better the efficiency of the drying cells.
The dryer is automatically switched off if temperature exceeds 80 °C (176°F.)
Return air temperature is continuously monitored; the return air cooler is activated only when nee- ded. If the return air temperature exceeds the set value (e.g. due to interruption in the cooling wa- ter supply or soiling), an alarm message is given.
The return air cooler can be connected to a coolant circuit or to the water mains network.
Functional description
