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6 | Setting instructions
1
3
2
Fig. 1 Remove the high limit safety cut-out
[1]
Screws
[2]
Cover
[3]
STB protective cap
Set the high limit safety cut-out in accordance with local
regulations, applicable standards and the boiler
certificate to the maximum permissible heating system
temperature.
The factory setting is 110 °C.
3.1.2 Adjusting the high limit safety cut-out
CAUTION: System damage due to incorrect installation
of the STB at the boiler!
The sensor must be pushed into the sensor well as far as
possible to ensure a reliable and fast shutdown in case of
excesstemperature. Ensure an optimum heat transfer
from STB sensor to boiler. The sensors must be secured
in the sensor wells by means of the sensor locks
(standard delivery). The capillaries must not be
damaged or kinked.
B Verify the function of the STB before commissioning.
B Regular checks must be performed in accordance
with the boiler manufacturer's specifications.
DANGER: Risk to life and of system damage through
incorrect shutdown of the STB.
B Ensure that the STB is correctly shut down before
commissioning the boiler.
Special regulations and standards apply to boilers with
an STB setting of 120 °C. Boilers installed with an STB
setting higher than 110C have to meet specific
requirements.
Version A
B Undo the screw [3].
B Adjust the temperature scale [2] to setting [1].
B Re-tighten screw [3].
6 720 802 836 (2012/05)
1
1
6 720 803 704-03.1T
Fig. 2 Adjusting the high limit safety cut-out (STB) - variant A
[1]
Marking
[2]
Temperature scale
[3]
Screw
B Install STB into housing.
B Check the high limit safety cut-out (
Version B
B Set the temperature using a screwdriver.
Fig. 3 Adjusting the high limit safety cut-out (STB) - variant B
B Install STB into housing.
B Check the high limit safety cut-out (
3.2
Setting instructions for boiler water thermostat (TR)
For systems requiring a boiler water temperature higher than 90 °C
(observe the relevant notice), the boiler temperature controller setting
can be changed from 90 °C to 105 °C.
B Pull off rotary dial.
B Break off the end stop tabs [1].
chapter 6.2, page 13).
chapter 6.2, page 13).
Changing the boiler temperature controller from 90 °C to
105 °C (STB setting 120 °C only).
Control units may be operated with a maximum flow
temperature of 99 °C (
chapter 9.3.5, page 24).
2
3
6 720 803 704-01.1T
6 720 803 704-12.1T
CFB 840
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