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Service Manual – SW5500, FLOORTEC R 985
29 - Engine System, LPG
STR Regulator Technical Features (Automatic Speed control)
This engine is equipped with a STR controller (automatic speed controller) that allows a start and a fast
heating of the motor without any manual intervention before and after its start
The STR controller controls the regulating valve and the air valve by means of a step motor to the throttle
control step located inside the carburetor The actuator, together with a unit wax-based thermally connected
(actuator assembly), controls the air valve of starting up a hot or cold engine
It is not necessary to use any battery for operating the STR controller The recoil starter starts the STR
controller
Figure 1:
ECM
AIR TEMPERATURE SENSOR
STEP BY STEP MOTORS
ACCELERATOR / AIR VALVE CONTROL
THROTTLE
AIR VALVE
AIR VALVE COMMAND
ACTUATOR
ACTUATOR COMMAND
POWER SOURCE
REEL POWER