Siemens RVL481 - 26 Function Block D.h.w. Solar Charging; Operating Lines; Functions; Temperature Differential ON;OFF Solar

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Siemens Heating and D.h.w. Controller RVL481 CE1P2541en
Building Technologies 26 Function block "D.h.w. solar charging" 20.05.2008
26 Function block "D.h.w. solar charg-
ing"
The RVL481 supports solar d.h.w. heating with the d.h.w. plant types 1, 2, 3 and 5.
The function is activated on operating line 126 by selecting the d.h.w. temperature
sensor. This always enables solar d.h.w. charging, carried out via the collector pump
based on the temperature differential between d.h.w. storage tank and collector tem-
perature.
The lower storage tank sensor B32 is used for solar charging control. If the sensor is
missing, the upper storage tank sensor B31 is used automatically (if available).
Symbol
on the displays indicates solar d.h.w. charging.
In the event of boiler support for solar d.h.w. heating, select setting 4 (1 sensor with
solar) on operating line 126 and still connect both storage tank sensors. This results in
solar d.h.w. charging based on the lower sensor (B32), and boiler support via the upper
sensor (B31). As a result, only the upper portion of the storage tank is charged via
boiler.
M4
2541S12
K6
B6
M5
B31
B32
B31 Storage tank sensor 1
B32 Storage tank sensor2
B6 Collector sensor
K6 Electric immersion
M4 Circulation pump
M5 Collector pump
26.1 Operating lines
Line Function, parameter Factory setting (range) Unit
201 Temperature differential ON solar 8 (0…40) °C
202 Temperature differential OFF solar 4 (0…40) °C
203 Collector frost protection --- (--- / –20…5) °C
204 Collector over temperature protection 105 (--- / 30…260) °C
205 Evaporation heat carrier 140 (--- / 60…260) °C
206 D.h.w. charging temperature maximum limitation 80 (8…100) °C
207 D.h.w. storage tank temperature maximum limitation 90 (8…100) °C
208 Collector start function gradient --- (--- / 1…20) min/°C
26.2 Functions
26.2.1 Temperature differential ON/OFF solar
Operating lines 201 and 202 allow for setting the temperature differential to enable or
disable solar d.h.w. charging.
A sufficiently large temperature differential between collector and d.h.w. storage tank
must exist for storage tank charging; in addition, the collector must have reached a
minimum charging temperature.
Note