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Siemens
Heating and D.h.w. Controller RVL481
CE1P2541en
Building Technologies
4 Acquisition of measured values
20.05.2008
4.7.2 Handling
faults
The controller's response to faults in the measuring circuits depends on the type of
d.h.w. demand (setting on operating line 126):
•
One d.h.w. storage tank temperature sensor (operating line 126 = 0 or 4):
In the event of a short-circuit or open-circuit in one of the 2 measuring circuits, the con-
troller continues to work with the other measuring circuit, if possible. An error message
will not be generated.
If no valid measured value is obtained from either of the measuring circuits, an error
message will be generated. The d.h.w. will no longer be heated and the charging pump
and the collector pump are deactivated.
Exception: With plant type x–2, the d.h.w. storage tank is always charged when sensor
B3 (d.h.w. flow) works normally
•
2 d.h.w. storage tank temperature sensors (operating line 126 = 1 or 5):
In the event of a short-circuit or open-circuit in one of the 2 measuring circuits, the con-
troller continues to work with the other measuring circuit. An error message will be
generated.
If no valid measured value is obtained from either of the measuring circuits, 2 error
messages will be generated. The d.h.w. will no longer be heated and the charging
pump and the collector pump are deactivated.
Exception: With plant type x–2, the d.h.w. storage tank is always charged when sensor
B3 (d.h.w. flow) works normally
•
One d.h.w. storage tank thermostat (operating line 126 = 2):
If, in measuring circuit B31, there is neither an open-circuit (thermostat open) nor a
short-circuit (thermostat closed), an error message will be generated. The d.h.w. will no
longer be heated and the charging pump is deactivated.
Exception: With plant type x–2, the d.h.w. storage tank is always charged when sensor
B3 (d.h.w. flow) works normally
•
2 d.h.w. storage tank thermostats (operating line 126 = 3):
If, in the measuring circuits, there is neither an open-circuit (thermostat open) nor a
short-circuit (thermostat closed), an error message will be generated. The controller
will continue to work with the measuring circuit that operates correctly.
If, in both measuring circuits, there is neither an open-circuit (thermostat open) nor a
short-circuit (thermostat closed), 2 error messages will be generated. The d.h.w. will no
longer be heated and the charging pump is deactivated.
Exception: With plant type x–2, the d.h.w. storage tank is always charged when sensor
B3 (d.h.w. flow) works normally
4.8
Collector temperature (B6)
4.8.1 Measurement
The collector temperature is acquired via a sensor with sensing element LG-Ni 1000
and an extended measuring range.
4.8.2 Handling
faults
An error message is generated and the collector pump deactivated with a delay of 12
hours in case of a short-circuit or open-circuit in the measuring circuit.
There is no solar d.h.w. heating
.
