oventrop Uni XH Instructions Pour L'installateur page 3

Replacement of the gland nut
Remove thermostat from the valve. Unscrew the gland nut
with a 14 mm key. Water will not escape as the valve is
provided with an additional seal. Screw on new gland nut
(item no. 1017501) and tighten with the key. Replace the
thermostat.
Note:
Not for valves "A (as from 2013), AV9, ADV9, CV9, RFV9, E,
AQ, RFQ, EQ and RF (as from 2014)".
Disposal
To protect the sensor liqiud from escaping, the thermostat
must not be destroyed when disposed of.
The thermostat contains hazardous waste
Dismounted/defective thermostats can be returned to the
manufacturer Oventrop.
They will be disposed of professionally.
Check list for faults
The desired room temperature is not reached or maintained
11. The flow temperature is set too low.
12. The circulation pump is not switched on.
13. The circulation pump or the flow temperature is con-
trolled by a separate electric room thermostat.
14. The pump output is set too low.
15. The flow direction of the pump is reversed.
16. The heating pipe is throttled back or shut off.
17. With gravity fed heating systems, a circulation pump
must be installed subsequently if necessary. Gravity
systems are very sensitive to the presence of air in the
system.
18. The radiator is covered by curtains, panelling etc. Use a
thermostat with remote sensor.
19. Temperature at the thermostat differs widely from the
ambient temperature due to poor siting. Use a thermo-
stat with remote sensor.
10. The remote sensor is badly sited. The best height is
about 1 m above the floor level.
11. The radiator selected is too small for the size of the
room.
12. If the required temperature is only reached at a higher
setting of the thermostat, recalibrate the thermostat (if
desired).
Subject to technical modification without notice.
101136586 02/2017
Gland nut
The thermostatic radiator valve does not function
13. The thermostat is not screwed tightly onto the valve.
14. The capillary of the remote sensor or the remote control
was kinked or flattened. Use a new thermostat and
install carefully.
15. If a strainer is used, has it become blocked? Remove
valve, flush pipe thoroughly, clean strainer and re-
install.
16. Air is reducing circulation in the radiator. Vent the radia-
tor.
17. Air is interfering with circulation in the heating system.
Fit an automatic airvent in a suitable position.
18. The valve seat was distorted, e.g. as a result of impro-
per assembly in vice. Fit a new valve.
19. The thermostat was readjusted due to unauthorised
tampering. Recalibrate thermostat.
The valve cannot be shut off
20. In most cases this is due to dirt particles on the valve
disc, e.g. 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 was
damaged. The valve insert can be replaced without drai-
ning 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 and the residue has to be
removed from the valve or the valve has to be replaced.
21. 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, e.g. when ventilating the room.
22. 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.
The valve leaks
23. The gland nut is loose. Tighten it.
24. The O-ring seal of the gland nut is damaged. Replace
the gland nut. The system does not have to be drained
to do this (see above).
25. The valve insert is loose. Tighten. If necessary, use a
new insert (compare point 20).
The valve rattles
26. Supply and return pipe are reversed.
Flow noises occur
27. Can the pump head (differential pressure) be reduced?
Please contact the manufacturer in case of further ques-
tions.
OVENTROP GmbH & Co. KG
Paul-Oventrop-Straße 1
D-59939 Olsberg
Telefon +49 (0) 29 62 82-0
Telefax +49 (0) 29 62 82-400
E-Mail mail@oventrop.de
Internet www.oventrop.com
For an overview of our global presence visit
www.oventrop.com.
3