Differential Pressure Measurement; Installation And Initial Operation - oventrop AQ Einbau- Und Betriebsanleitung Für Fachpersonal

Illustr. 2 Construction thermostatic valve "AQ"
The radiator lockshield valve "Combi 2" allows
for the removal of the radiator without draining
the system.
The thermostat "vindo TH" together with the
thermostatic valve is also a proportional
controller for room temperature control working
without auxiliary energy.

5.2 Differential pressure measurement

The available differential pressure at the
thermostatic valve "AQ" can be measured with
the help of the OV measuring systems ("OV-DMC
2" or "OVDMPC") together with the "Demo-Bloc"
(item no. 1188051) and the differential pressure
measuring stem (item no.1188093). This will
confi rm if the differential pressure is high enough
for an automatic fl ow control of the valve. The
pump setting may also be optimised by
measuring the differential pressure.
For this purpose, the pump head is reduced
until just the minimum required differential
pressure is available at the hydraulically most
underprivileged valves.
12
1 Presetting key
2 Valve insert
2a Handwheel
3 Body
4 Protection cap
5 Collar nut
6 Tailpipe
∆p Differential pressure
With a fl ow meter connected, the differential
pressure at the thermostatic valve body is
measured. To do so, the valve insert (pos. 2,
illustr. 2) is unscrewed with the help of the
"Demo-Bloc" and the differential pressure is
measured using the differential pressure
measuring stem. As soon as the measured
differential pressure has reached or exceeded
the differential pressure ∆p min. (see 4.1), the
differential pressure is high enough for an
automatic fl ow control of the valve.
Screw the valve insert into the valve body again
and check all installation points for leaks.
NOTICE
The valve insert is tightened with a torque
of 15 Nm.
Use a 19 mm spanner for mounting or
dismounting the valve insert.
5.3 Noise behaviour
For a silent operation in combination with an
installation which is sensitive to noise (e.g.
radiators), the maximum differential pressure
across the valve should not exceed 600 mbar.

6 Installation and initial operation

The pipework has to be fl ushed thoroughly
before installation of the thermostatic valve
and the radiator lockshield valve.
6.1 Installation
6.1.1 Installation of the thermostatic valve
The thermostatic valve is installed in the supply
pipe to the radiator so that the thermostat is in
a horizontal position and a good circulation of
air is guaranteed.