Siemens LMV37.4 Series - Page 16

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Building Technologies Basic documentation LMV37.4... CC1P7546en
1 Safety notes 17.12.2018
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)
Duties of the expert when making the approval tests
Action Check / response
a) Burner startup with flame detector
darkened
Lockout at the end of first safety time
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
Lockout at prepurge time
c) Simulation of loss of flame during operation. For
that, darken the flame detector in the operating
position and maintain that state
Lockout or restart, depending on the LMV37.4
configuration
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 LMV37.4 requires to
turn off power to the valve
Turning off power to the valves by the LMV37.4 within
the period of time permitted for the respective type of
plant
e) Check the safe operation of the burner while giving
consideration to LMV37.4 tolerances
LMV37.4 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!
Further checks may be required, depending on the field of use and the relevant
standards.