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Building Technologies Basic Documentation LMV27... CC1P7541en
11 Actuators X53 / X54 17.12.2018
11.9 Protection against actuator mixup
Mixup of actuators can be detected through appropriate mounting (using different
reference marks for the air and fuel actuator: OPEN / CLOSE / 0° / 90°). With at least
one of the actuators, the reference mark not used must be blocked by a mechanical
stop. Now, if the actuator connections with the LMV27 have been interchanged, one of
the actuators cannot reach the reference mark, which is detected by the LMV27.
Protection against mixup is a question of burner application and must be ensured by the
OEM.
Caution!
To be able to detect mixup of actuators, the burner manufacturers must ensure
that the 2 actuators use opposing reference points. One of the actuators uses
the OPEN reference, the other the CLOSE reference. Approach of the reference
point not used must be blocked with at least one of the actuators!
11.9.1 Proposal for implementation
Parameterize referencing of the air damper in the CLOSE position
Parameterize referencing of the fuel damper in the OPEN position. Unnecessary
travel can be avoided by defining a rest position of 90° for the fuel damper
Mechanical stop at the air damper in the range between 90° and 108.5°, and / or
mechanical stop at the fuel damper in the range between 0° and -5.6°
Referencing process
From any position in the working range (0…90°), but typically from the home
position, the air damper travels to the -7.7° position and back again to the home
position
From any position in the working range (0…90°), but typically from the home
position, the fuel damper travels to the 110.6° position and back again to the home
position
Process in the event of actuator mixup
The fuel damper (fitted in place of the air damper) travels to the -7.7° position and
back again to the home position
The air damper (fitted in place of the gas damper) tries to travel to the 110.6°
position, but is prevented from doing so by the mechanical stop. This is
unsuccessful travel and identified as actuator mixup
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