oventrop OV-DMC 2 Operating Instructions Manual page 21

Before carrying out the on site regulation, it has to be verified whether all isolating valves within the circuit
are opened. Moreover it must be ensured that the installation corresponds to the design condition, e.g. ther-
mostatic radiator valves preset, thermostatic head removed.
Sequence of regulation:
1. Number the valves of the regulating group all the way through without forgetting or skipping a valve (see
example of an installation on page 20).
2. Set all valves in the regulating group to position "half opened".
The group valve may also be fully opened
3. Measure each valve of the group to be regulated in position "half opened" and "closed" by using the
flow meter. Here, the instructions of the flow meter for the sequence of measurement have to be ob-
served When entering the measured data of the individual valves of a group, the sequence of the
measurements may be chosen freely but once the numbering of the valves has been determined, it has to
be observed.
4. Measurement of the group valve of the last regulating group in position "closed".
5. Calculation of presetting values for the valves of the regulating group without group valve by using the
flow meter. Operating errors and insufficient differential pressures making a calculation of the presetting
values impossible, are indicated by the flow meter.
6. Set the valves of the regulating group according to the presetting values calculated by the flow meter.
Should further regulating groups exist, proceed according to the steps mentioned above.
7. Regulation of the last group valve behind the circulation pump by using the computer method.
Here, the total flow rate required for the subsequent regulating groups is entered into the flow meter and
the required presetting for the group valve is calculated. The hydronic balance of the complete supply
system is only completed after having set this presetting value at the last group valve.
OV-Balance offers the following menu options:
– "Measurement"
Input of the measured data of the individual valves of a regulating group including the group valve with
subsequent calculation of the required presetting values. See sequence of programme on pages 22, 23
and 24.
– "New valve"
Subsequent addition of valves to a regulating group which were not taken into consideration in the
numbering before. See sequence of programme on pages 25 and 26.
– "Delete valve"
Subsequent deletion of valves of a regulating group.
See sequence of programme on page 27.
– "Move valve"
Subsequent moving of valves of a regulating group if the numbering within the menu "Measurement" was
mixed up. See sequence of programme on page 28.
OV-Balance
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