32
D33464 | Date 09/2018
Operation and control
Setting MAX
Set
temperature
t
°C
Controller error
Emergency operation
Fig. 22
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. 23).
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. 23:
50 °C ± 2 K) – e.g. if the doors are opened during operation (section B of illustration) – the
alarm is set off. The ASF alarm is automatically terminated as soon as 50 % of the set toler-
ance 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
A
B
C
D
E
AUTO
AUTO
AUTO
Fig. 23
Schematic diagram of how the ASF temperature monitoring works
