oventrop TRV9 Manual De Instrucciones página 16

The valve cannot be shut off:
18. In most cases this is due to dirt particles
on the valve disc, for instance welding
beads or rust particles. These particles can
often be removed by repeatedly working
the valve stem. To do this, the thermostat
must be removed first.
The valve insert must be replaced if the
valve disc is damaged. The valve insert can
be replaced without draining the system
with the help of the "Demo-Bloc" tool
specially developed for this purpose. If this
is not successful, the valve insert must be
removed after having drained the system
so that any residue can be removed from
the valve or alternatively the valve has to
be replaced.
19. The frost protection responds. The crystal
symbol ❄ corresponds to a room
temperature of about 7°C. The valve will
therefore open as soon as the temperature
drops below this level, for instance when
ventilating the room.
20. The thermostat is defective and must be
replaced. First test whether this is due to
dirt or unauthorised tampering of the
calibration. Screw on a new thermostat
and send the old one back to the supplier
for replacement. If still under guarantee, it
will be repaired or replaced free of charge.
Subject to technical modification without notice.
167370380 06/2016
16
The valve leaks:
21. The O-ring of the gland is damaged. The
valve insert has to be replaced. This can
be done under working conditions without
draining the system by using the special
tool "Demo-Bloc".
22. The valve insert is loose. Tighten.
The valve rattles:
23. Supply and return pipe are reversed.
Flow noises occur:
23. The differential pressure at the valve is too
high; reduce differential pressure (pump
pressure).
For an overview of our global presence visit
www.oventrop.com.