Additional information
95
System components
(continued)
Mixing valve extension board, Part No. 7820 193
The board contains the relays for
activating the mixing valve motor
and the heating circuit pump of the
mixing valve circuits M2 and M3.
Electronics board, Part No. 7829 790
This is connected to the mixing
valve extension board.
All data are processed and the
outputs (relays) activated.
Optolink/emissions test switch board, Part No. 7820 165
The circuit board contains:
Operating status indicator
Fault indicator
Optolink laptop interface
Emissions test switch
Emissions test switch for flue gas
measurements with the boiler
operated with constant boiler water
temperature for a short time.
The burner is switched on
(this can be delayed if the system
incorporates a fuel preheater)
all pumps are switched on
the mixing valve remains in its
control mode
the boiler water temperature is
controlled by the adjustable high
limit ”
R
”.
Programming unit, Part No. 7823 986
The programming unit is inserted in
the control unit.
For setting:
Heating program
Set-point values
Switching times
Heating curve (shift and slope)
Date
Time
Energy saving and party mode
For displaying:
Temperatures
Operating status information
Faults
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941
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