2 General Description DBW 2010 / 2016
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2.10 Temperature limiter/thermal fuse
Temperature limiter
The temperature limiter (bi-metal) protects the heater against
impermissibly high operating temperatures. The temperature
limiter reacts at a temperature above 107 °C or 117 °C and
switches off the heater. The temperature limiter can be reset
or is automatically reset.
Thermal fuse
The thermal fuse protects the heater against impermissibly
high operating temperatures. The thermal fuse contains a
fusible link which reacts when the permissible temperature is
exceeded and switches off the heater.
The heater can be retrofitted with a temperature limiter in
place of the thermal fuse.
2.11 Control thermostat
Control thermostat on heater
The control thermostat assumes the control operation after
the operating temperature is reached. Alternately switching
the heater on and off maintains the coolant temperature at a
constant level. The thermostat closes at 63 ± 5 °C and opens
at 70 ± 3 °C.
DBW 2016 Rail version: The thermostat opens at 65 ± 3 °C
and closes at 50 ± 5 °C.
External control thermostat
The control operation can also be controlled by an externally
mounted control thermostat.
The control thermostat assumes the control operation after
the operating temperature is reached. Alternately switching
the heater on and off maintains the coolant temperature at a
constant level. The thermostat closes at 71 ± 2° C and opens
at 78 ± 2° C; alternatively at 62 ± 2° C and 70 ± 2° C.
For heaters with an economy mode (temperature holding
mode), a thermostat can be installed which opens closes at
35 ± 2° C and opens at 42 ± 2° C.
Fig. 216 Temperature limiter/thermal fuse
only for heaters with 1563/1564 control unit
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