Samson 43-1 Mounting And Operating Instructions page 38

Malfunctions
Table 8: Troubleshooting
Malfunction Possible reasons
Valve installed against the flow.
Strainer blocked.
Regulator or K
A safety device (e.g. STL or STM) has been
Temperature at the
triggered.
sensor does not
reach the set point.
Insufficient heating energy available
Foreign particles blocking the plug
Sensor installed in the wrong location.
Sensor installed incorrectly.
Jerky control Increased friction, e.g. due to foreign par-
response ticles between seat and plug.
Loud flow-induced
High flow velocity, cavitation.
noise
Leak between
control thermostat Valve seal defective
and valve
38
/C coefficient too small
VS V
Recommended action
Î Install the valve so that the direction of flow
matches the direction indicated by the arrow
on the body.
Î Clean strainer.
Î Check the sizing.
Î Change K /C coefficient, if necessary or
VS V
install a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Check plant. Unlock safety device (where
necessary).
Î Draw up an energy balance.
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Î Change the mounting position.
Î Immerse the temperature sensor with its entire
immersion depth in the process medium.
Î Avoid an installation site where idle times or
heat buildup can occur.
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Î Check the sizing.
Î Install larger regulator, if necessary.
Î Replace defective plug.
Î Contact SAMSON's After-sales Service.
EB 2171 EN