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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 6 Basic unit 01.12.2009
6.5.3.11. Test function for approval of burner – 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 period of 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 used, the test is car-
ried out at the current output of the system
• Start the test by entering value 1 for parameter 124.
If the burner’s output was defined for the test (parameter 133 or 134), the system
runs to that output first. To implement this functionality, the default value of parame-
ter 121 (manual output) is used. This cancels any manual output that was previ-
ously active
• Now, the LMV37.4… shuts the fuel valves, producing loss of flame
• The evaluation is made by the basic unit by measuring the period of time the sys-
tem requires from fuel valve shutdown until loss of flame is detected.
Then, the required time is displayed in the form of diagnostic code C:7 (loss of
flame)
The resolution is 0.2 seconds.
Example
When the display reads C:7 D:10, the time required from valve shutdown to detec-
tion of loss of flame is 2 seconds (D:10 means 10 x 0.2 = 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 only possible in phase 60) – display reads C:150 D: 1
-2 = default output < minimum output – display reads C:150 D:2
-3 = default output > maximum output – display reads C:150 D:3
-4 = manual abortion (no error, start variable was manually reset to 0) – display reads
C:150 D:4
-5 = timeout during TÜV test (no loss of flame after shutdown of valves within 50
seconds) – lockout C:150 D:5
Previously set output values at which the test shall be made (parameter 133 or 134) re-
main stored.
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