Siemens LMV27.100x2 Basic Documentation page 16

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 LMV27 requires to
turn off power to the valve
e) Check the safe operation of the burner while giving
consideration to LMV27 tolerances
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Building Technologies
The functions of the following available or required input status signals must be
checked:

Air pressure

Minimum gas pressure and 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 LMV27...
1 Safety notes
Check / response
Lockout at the end of the first safety time
Lockout at prepurge time
Lockout or restart, depending on the LMV27's
configuration
Turning off power to the valves by the LMV27 within the
period of time permitted for the respective type of plant
LMV27 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 flueways
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!
CC1P7541en
17.12.2018