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Building Technologies Division
Basic documentation LMV36...
CC1P7544en
Infrastructure & Citiies Sector
7 Basic unit
25.09.2013
7.5.5.11. Test function for burner approval – loss-of-flame test
(TÜV test)
The purpose of this test is to verify the detection time required in the event of loss of
flame when applying for burner approval. When starting the test, the fuel valves are shut
to determine the time (resolution of 0.2 seconds) until the basic unit detects loss of
flame.
Procedure:
Determine the burner output at which the test shall be made, using parameter 133
(fuel 0) or parameter 134 (fuel 1). If these parameters are not set, the test is carried
out at the current output of the system
Start the test by entering the value of 1 for parameter 124.
If the burner’s output for the test is set (parameter 133 or 134), the system is
driven to that output level first. To ensure this function, the presetting of
parameter 121 (manual output) is used. This cancels any manual output that
was previously active
Now, the LMV36… shuts the fuel valves, leading to loss of flame
The evaluation is made by the basic unit by measuring the time the system requires
from fuel valve shutdown until loss of flame is detected.
Then, the measured value is available as a diagnostic code in connection with
error C:7 (loss of flame)
The resolution is 0.2 seconds.
Example:
The display of C:7 D:10 means that the time required from valve shutdown to
detection of loss of flame is 2 seconds (D:10 corresponding 10 x 0.2 seconds).
When the test is successfully completed, parameter 124 is reset to 0. If
unsuccessful, a negative value is delivered for diagnostic purposes and error code
150 is entered.
-1 = invalid phase (test possible in phase 60 only) – message displayed: C:150 D: 1
-2 = default output < minimum output – message displayed: C:150 D:2
-3 = default output > maximum output – message displayed: C:150 D:3
-4 = manual abortion (no error, start variable was manually reset to 0) – message
displayed: C:150 D:4
-5 = timeout with TÜV test (no loss of flame within 50 seconds after valves were
shut) – lockout: C:150 D:5
Values previously set for the burner’s output at which the test shall be made
(parameter 133 or 134) remain stored.