D33451 | Date 01/2018 33
Operation and control
Setting MAX
Set
temperature
t
°C
Controller error
Emergency operation
Fig. 19 Schematic diagram of how TWW temperature monitoring works
Automatic temperature monitor ( ASF)
ASF is a monitoring device that automatically follows the set temperature setpoint within an
adjustable tolerance band (Fig. 20).
The ASF – if switched on – is automatically activated as soon as the actual temperature value
reaches 50 % of the set tolerance band of the setpoint (in the example: 50 °C ± 1 K) for the
first time (section A).
When the temperature violates the set tolerance band around the setpoint (in the example in
Fig. 20:
50 °C ± 2 K) – e.g. if the door is opened during operation (section B of illustration) – the alarm
is set off. The ASF alarm is automatically triggered as soon as 50 % of the set tolerance band
of the setpoint (in the example: 50 °C ± 1 K) are reached again (section C).
If the temperature setpoint is altered, the ASF is automatically disabled temporarily (in this
example: The setpoint is changed from 50 °C to 25 °C, section D), until it reaches the tolerance
range of the new temperature setpoint (section E).
52°C
48°C
ASF active
52°C
48°C
ASF alarm
ASF active ASF active
27°C
23°C
°C
50°C
25°C
t
ABCDE
AUTO AUTO AUTO
Fig. 20 Schematic diagram of how the ASF temperature monitoring works
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