7
Service
and Maintenance
70
7
Service and Maintenance
If the boiler is to be wet-cleaned, please note the following:
Only carry out wet cleaning after the probe has been removed. If wet cleaning is
performed with the probe installed, it will be damaged. Trouble-free operation is then
no longer possible.
NOTE:
The probe must always be removed before wet cleaning.
Wet
cleaning with the probe installed causes damage to the probe.
7.1
Checking/calibrating the KS1-DK combination probe
Checking/calibration (when installed in an appropriate location) should be carried out
at normal operating temperature and under operating conditions.
Recommended intervals (cycles):
•
6 hours after commissioning
•
3 to 6 months for natural gas combustion
•
See section 6 “Commissioning the measurement”
CAUTION: Don’t forget!
After replacing the probe, perform a new offset calibration in air and a new test gas
calibration.
Limit value 4
is factory-set in such a way that an automatic check of the probe is
possible when the system is stationary and during pre-ventilation.
Limit value 4
→
-5 mV U-O2 undershoot, automatic reset trigger delay 3 seconds -
20mV undershoot is monitored by fault 1
Fault 1 must never be triggered when the probe is inactive. If fault 1 " Probe voltage <
-20mV " is triggered, it must be reset manually.
NOTE:
After a power failure (and thus the failure of the probe heater), the probe voltage U-
O2 may briefly drop below the value -20 mV while the probe is heating up again.
We recommend that you retain the factory setting of limit value 4 for safety reasons.