Atag LMU-B A Serie Manuel D'instructions page 7

GB
Instructions for replacing control unit LMU-B ATAG A-Series
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This instruction sheet describes the procedure for the replacement of the control unit of
the ATAG A-Series.
Any installation related settings in the control unit to be replaced must be chec-
ked and noted (if possible) before executing the procedure. The values have to
be set in the new control unit (type of gas, water flow temperature, etc.).
Follow the next procedure:
- Press for 3 seconds the OK-key.
The display shows 'P6 (alternated by) 81';
- Press the OK-key again for 3 seconds.
The display shows 'on' for a short time, followed by 'P5 18;
You have access now to the parameter chapter. Fill out the values of all parameters
in the table on the next page.
- Press the Scroll-key to select another parameter;
- Press the OK key to show the value of the selected parameter;
- Press the ESC key to return to the menu to select the following parameter;
- Press the Scroll-key to select the following parameter, etc.
When the values from the control unit can not be retreived caused by an certain
error, it is important to determine first to which kind of gas the boiler is connec-
ted and adjusted. This is set in Parameter 651.
1= Kind of gas/Type from factory
2= Non return valve (with sticker 'non return valve installed' on the
heat exchanger)
3= Propane.
When this parameter is not set correctly after replacment, it can lead to serious-
ly damage to the boiler. The other parameters will be set according to factory
settings. See the installation manual.
- Take the plug out of the wall socket (Picture 1);
- Remove all locking screws from the housing (A, B, C and D);
- Remove the housing by releasing the quick fasteners (Picture 2);
- Turn the control unit to the left;
- Disconnect all connectors;
- Turn the control unit back in position;
- Press the locking device (E) of the hinge and remove the control unit from the hinge
bracket (Picture 3);
- Put the new control unit on the hinge bracket;
- Connect all connectors in reverse order of disconnection (Picture 4);
- Turn the control unit back in position (Picture 5);
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