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Building Technologies Basic Documentation LMV5... CC1P7550en
19 O2 trim control with LMV52 and PLL52 22.05.2018
19.7.3 Service timer for QGO20
A service timer has been implemented for the QGO20.
The time on the service timer is compared against the time that the system has been in
operation (TotalHours hours run counter).
The following occurs if the set time has elapsed:
∂ In the conAutoDeac operating mode, O2 trim control is deactivated automatically;
however the O2 alarm remains active
∂ In the O2 Alarm and O2 Control operating modes, lockout is initiated
∂ The following displays appear in the display of the AZL52:
O 2 S e n s o r
S e r v i c e i n t e r v a l
e x p i r e d
The service work to be performed is described in the QGO20 Basic Documentation
(P7842), refer to chapter Service note.
Using the O2SensServTimRes parameter, the timer can be reset once the service work
has been completed:
If the O2 trim control is set to auto deact, it is reactivated by setting it to conAutoDeac.
The service interval can be set via the O2SensServTim parameter.
If the service interval is set to 0, the function is deactivated!
Parameter O2SensServTim
O2SensServTimRes
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