Lamtec ETAMATIC, Manual, Page: 121 / 136

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9 Appendix
9.23 Run to Shut-off Limits
Like every control system, the ETAMATIC has tolerances, which affect the accuracy of the set-
tings. You have influence of these tolerances of the ETAMATIC with the parameter settings.
When you adjust the combustion system, ensured that there is a safe and stable flame. To
verify this, it is necessary that you test the combination of settings not only by regarding the
required values that you have set, but also the so-called shut-down limits. This are actuator
settings which the ETAMATIC just takes without switching off.
Perform this test for the whole load range and for all operating modes.
This test may only be dispensed with if:
–
the installation is fitted with fail-safe O
2
or CO monitoring which can trigger a burner shut-
down if there is incomplete combustion
or
–
the installation is fitted with fail-safe O
2
trim/ CO control, which compensates the combus-
tion tolerances
or
–
You ensure that the requested mode, has as much excess air over the whole range, that
the tolerances of the ETAMATIC are of no consequence
or
–
the parameters in the ETAMATIC are set in that way, that the air defficiency tolerances
have 0 digit, i.e. there is only tolerance on the excess air side.
WARNING!
If you waive to check the shut-down limits because of one of these measures, you should
check the effectiveness of that measure instead, e.g., if there is O
2
/ CO monitoring or control,
the stability of ignition should be tested at the shut-down value set
WARNING!
Due to verification in respect of authorities, test houses, quality management systems, liability
issues, etc., we strongly recommend that you document any running to shut-down limits
Adjust setpoint value of the continuous channel in the air deficiency direction until the actual
value feedback has changed by the set number of points (monitoring band)
Check combustion

Reset setpoint value to the next continuous channel in air deficiency direction.

Check combustion

Repeat, until all continuous channels are checked at their limits.
press key 12
press keys 2 and 3 to run to the load point for checking it
wait until the system has run to that point
enter password
press key 14 one time (setting)