Service
Manual
9406
Repair instructions
Deposits of scale in the diaphragm may prevent the
valve from closing or opening correctly. The valve
should be cleaned at specific intervals which
depend on the operating conditions and the quality
of the water.
The valve fails to open or close correctly
•
Check that the motor has the correct voltage
supply.
•
Check that the plunger rod can move freely.
•
Check that the diaphragm is not clogged by
deposits of scale.
Comment
When replacing the motor:
Brown cable: 60 Hz
Blue cable: common
Black cable: 50 Hz
Tensioning the Return Springs
With the valve housing removed:
– Turn the return spring so that the spring's
"tounge" lies against the stop screw.
– Place the valve housing over the return spring
so that the pin on the spring fits into the inlet of
the piston rod (CAUTION! The piston rod shall
be fitted so that its input is longitudal with the
housing).
– Then turn the housing one turn in a clockwise
direction. (In this way the spring's pin will be
threaded into the piston rod. The spring is then
tensioned approximately 1/4 turn, as a result of
the rise in the piston rod).
38. Drain valve
38
2
Stopscrew
Spring tounge
Return spring's pin
