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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the heating engineer settings
18.10.2002
Solar yield measurement
The controller is capable of acquiring the solar yield. The 24-hour and total solar energy
yield are displayed on operating lines 65 and 66 respectively. These values can also be
queried via the Info button.
To perform heat metering, the controller requires the temperature differential between
flow and return and the volumetric flow.
If water is not the only heat conducting medium, the controller requires additional data,
enabling it to calculate the specific heat capacity of the respective heat conducting me-
dium.
Solar yield measurement is not a form of calibrated heat metering! The accuracy of the
measurement is strongly dependent on the measuring tolerances of the sensors and
flow meter used.
The data for calculating the specific heat capacity are to be entered on operating lines
338 (type of antifreeze agent) and 339 (concentration of antifreeze agent).
The volumetric flow (l/h) can either be measured with a flow meter (operating lines 340
and 870) or, if known and constant, can be ready entered on operating line 341.
To ensure accurate measurement of the temperature differential, we recommend the
use of additional calibrated sensors in the flow and the return (B63 / B64).
These can be selected as an auxiliary function (ZuFu14, operating lines 159 and 160).
The type of sensor used is to be entered on operating line 342, the actual values of the
sensors can be queried on operating lines 343 and 344.
If there is only one collector, one additional return temperature sensor B64 is sufficient.
The controller uses the value of collector sensor B6 as the flow temperature (in place of
B63). The sensors must be calibrated via the measured value correction.
If no more terminals are available for additional temperature sensors, approximative
heat metering can be made with the existing sensors on the collectors and storage
tanks.
In place of flow temperature sensor B63, collector temperature sensor B6 or B62 is
used, depending on the collector currently in operation. If both collectors are operated
at the same time, the average value of B6 and B61 is used.
In place of return temperature sensor B64, the temperature sensor used is that at the
bottom of the storage tank that is currently being charged. If both storage tanks are
charged at the same time, the average value of both sensors is used.
To acquire the amount of heat supplied to the swimming pool, at least return tempera-
ture sensor B64 (operating line 160) must be present. In connection with heat metering,
swimming pool sensor B13 is not taken into consideration.
Note
Specific heat capacity
Volumetric flow
Temperature differential
Note
Substitute for flow
temperature sensor
Substitute for return
temperature sensor
Swimming pool
