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Siemens Building Technologies
Basic Documentation RVD110, RVD130
CE1P2381E
HVAC Products
19 Function block Locking functions
27.05.2004
19.8.2 Parameters
The waiting time can be adjusted in the range 3…255 minutes, that is, the time be-
tween 2 valve opening actions (increment of 10 minutes, operating line 163).
Fixed settings:
•
Opening time: 30 seconds
•
Stroke: 25 %
•
Switch-off temperature (only if sensor B7 is present); it lies 5 °C below the d.h.w.
setpoint
19.8.3 Mode of operation
Cooling down is prevented by opening the 2-port valve in the primary circuit at regular
intervals, using fixed settings. The function is only active in the d.h.w. heating mode
(d.h.w. heating released).
•
Switch-on criteria for idle heat function:
−
No demand for heat (neither space nor d.h.w. heating) during the waiting time
−
No offset of heat losses
−
Waiting time since the last valve opening action elapsed
•
Switch-off criteria for idle heat function:
−
Without sensor B7: Opening time has elapsed
−
With sensor B7: Return temperature > switch-off temperature
or
after two minutes
The function will be aborted when
•
the flow sensor delivers a signal
•
there is demand for heat
19.8.4 Location
of
sensor
The primary return temperature sensor is to be located in the common return of space
heating and d.h.w. This means that only 1 sensor is required for maximum limitation of
the primary return and for the idle heat function.
Y1
B7
B71
B1
Q1
23
81
S
04a
M
B7
B1
Flow temperature sensor heating circuit
B7
Primary return temperature sensor
B71 Secondary return temperature sensor
Q1
Circulating pump heating circuit
Y1
2-port valve heating circuit
19.9 Locking on the hardware side
In addition to locking the locking functions level on the software side, this function al-
lows locking on the hardware side. The respective entry is to be made on operating line
191.
If locking on the hardware side has been activated, the locking functions level can be
accessed only if, beforehand, terminals B71–M have been bridged. For locking on the
software side, refer to subsection 22.1.6 ”Setting levels and access rights”.
