User Manual

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Building Technologies Division CC1N7491en
18.07.2018
Display of additional service data
Using the CH potentiometer, several internal parameters can be displayed. For
activation of this function, the CH potentiometer must be moved from the starting
position to the «Display» area, then out of it and back into it again – all within one
second. The function will be active 2 seconds later.
The Heating circuit potentiometer can then be used again to set the heating setpoint.
It is not necessary to keep it in the «Display» position. While operating the CH
potentiometer, the CH setpoint will be displayed. 5 seconds after the last action, the
display will show the selected parameter. While activating this function, the actual DHW
setpoint will be stored, so DHW requests will be carried out at this setpoint. 10 different
parameters can be selected with the DHW potentiometer. When the «Display» function
is active and the DHW potentiometer is being operated, the display shows parameter
name A0...A9, depending on the position of the DHW potentiometer. After selecting a
parameter, the display shows alternatively the parameter name Ax (1 s) and the
parameter value (3 s).
10 different values appear on the display, depending on the DHW potentiometer
position.
A0 DHW position 0: Actual DHW temperature
A1 DHW position 1: Outside temperature
A2 DHW position 2: Actual PWM fan value
A3 DHW position 3: Actual fan speed
A4 DHW position 4: Actual CH setpoint produced by the LMU34
A5 DHW position 5: Flue gas NTC temperature
(not identical with the effective flue gas temperature)
A6 DHW position 6: Diagnostic code
A7 DHW position 7: Actual PWM heating circuit pump value
A8 DHW position 8: Boiler identification
A9 DHW position 9: Boiler parameter identification
This function stops when the starting sequence on the CH potentiometer is repeated
once again, or when there was no action within 3 minutes (timeout). When the function
ended by timeout and the CH potentiometer is in the «Display» position, a «d» will
appear alternating with the CH temperature (5 s) to remind the user to set the CH
setpoint again to a useful value. In this situation, the CH setpoint or room temperature
setpoint (depending on the outside sensor) is set to the minimum. The DHW setpoint
will then be taken from the actual DHW potentiometer position. This flashing sequence
will stop as soon as the CH potentiometer leaves the «Display» position.
DHW potentiometer CH potentiometer
A0
A1
A2
A3
A4
A5
A6
A7
A8
A0
max.
min.
B
A
7491z02/0805
max.
min.
Display
Marking of the DHW and CH potentiometers
Range A: Chimney sweep or controller stop function, no preheating function *)
Range B: No preheating function *)
*) Depending on parameterization
CH potentiometer in the
«Display» position:
Marking of the
potentiometers: