General Information - oventrop OV-DMC 2 Operating Instructions Manual

General information

General information:
The flow meter "OV-DMC 2" was specially designed for flow measurements and the hydronic balancing of
heating and cooling systems. In practice, operation off the line is guaranteed by using rechargeable batte ries.
To facilitate handling, null balance is automated. This process of changeover to the measuring position of the
measuring head is taken over by an electric motor which is automatically triggered by the flow meter during
each measurement. This step largely protects the measuring head against any damage. To protect the mea-
suring head from contamination, the inlet and outlet nipple are provided with integrated strainer inserts. Nip-
ples for replacement are supplied with each flow-meter (see part 17, page 7) and can be replaced by using a
standard spanner (spanner size 17 mm). Spare part number of the nipples for subsequent ordering:
106 91 86.
Attention: b Before the measuring hoses are connected to the double regulating and
commissioning valve, the flow meter has to be connected to the measuring head and
has to be switched on.
b Provide for free water flow through measuring hoses. Clean or replace strainer inserts
of the measuring hose in case of heavy pollution.
For further details regarding function sequences see page 12 and onwards.
The logical structure and the consequent query on the display offer a good condition to carry out hydronic
balancing of existing installations without calculation. Presetting of a double regulating and commissioning
valve can be calculated by using the balanced pressure method, computer method or OV balance method
after having entered the valve size and the nominal flow rate. The presetting values of individual double regu-
lating and commissioning valves can be calculated on the basis of the characteristic lines of all Oventrop
double regulating and commissioning valves as well as those of some competitors which are stored in the
flow meter (see list on next page).
When using the "OV-DMC 2" for the regulation of valves which are not produced by Oventrop, the corres -
ponding kv-value has to be entered before the first measurement. To do so, the kv-value method is chosen in
the menu "Measurement-Setup". Any data obtained during measurement is stored in the "OV-DMC 2" and
can be processed via a PC under Windows which guarantees the filing of any data obtained during hydronic
balancing. Moreover, temperature can be measured by using the flow meter. To do so, the sensor is
introduced into the pressure test points at the double regulating and commissioning valve "Hydrocontrol". As
for the double regulating and commissioning valves "Hycocon", the temperature must be seized at the pipe-
work or the valve body.
4