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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 4 Acquisition of measured values 23.10.2002
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
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 temperature sensors (operating line 126 = 1):
In the event of a short-circuit or open-circuit in one of the 2 measuring circuits, the
controller 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 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
• 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
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