User Manual

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Building Technologies CC1N7491.1en
03.04.2018
Display of additional service data
Using the CH potentiometer (heating), several internal parameter values can be dis-
played. 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.
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 parame-
ter name Ax (1 s) and the parameter value (3 s).
10 different values appear on the display, depending on the DHW potentiometer posi-
tion.
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: Free / current DHW temperature 2
(depending on LMU34 type)
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 ap-
pear 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: