Siemens LMV36.520A1 Basic Documentation page 20

Duties of the expert when making the approval tests
Action
a) Burner startup with flame detector
darkened
b) Burner startup with flame detector exposed to
extraneous light, e.g. to incandescent light with
detectors for visible radiation, quartz-halogen bulb
or cigarette lighter flame with detectors for UV
radiation
c) Simulation of loss of flame during operation. For
that, darken the flame detector in the operating
position and maintain that state
d) Check the plant's response time with loss of flame
during operation. For that purpose, manually
disconnect the fuel valves from power and check
the time from this moment the basic unit requires to
turn off power to the valve
e) Check the safe operation of the burner while giving
consideration to system tolerances
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The functions of the following available or required input status signals must be
checked:

Air pressure

Minimum gas pressure / maximum gas pressure or POC

Gas pressure valve proving

Minimum oil pressure and maximum oil pressure

Safety loop (e.g. safety limiter)
Further checks may be required, depending on the field of use and the relevant
standards.
Basic documentation LMV36...
1 Safety notes
Check / response
Lockout at the end of safety time 1 (TSA1)
Lockout at prepurge time (t1)
Lockout or restart, depending on the basic unit's
configuration
Turning off power to the valves by the basic unit within
the period of time permitted for the respective type of
plant
System tolerances are the result of a number of factors,
such as:
Tolerances of actuators plus mechanical linkage to
-
the controlling elements
Environmental conditions
-
(temperature, air conditions)
Type of fuel (calorific value / pressure)
-
Type of supply air path and flue ways
-
Example of procedure for checking the burner's
response to actuator tolerances:
Approach a output point in programming mode (e.g.
-
low-fire or high-fire)
Change the actuator's position against the optimum
-
fuel-air ratio setting as can be expected in the case
of tolerances
Check the flue gas values with a flue gas analyzer
-
Recommendation:
Make this readjustment against the optimum fuel-air
ratio setting for one actuator at a time!
CC1P7544en
25.09.2013