Siemens RVL481 - Manual Overriding of Operating Mode (Contact H1); Pump Overrun

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Siemens Heating and D.h.w. Controller RVL481 CE1P2541en
Building Technologies 25 Function block "Service functions and general settings" 20.05.2008
The display shows the fault status message with . More detailed information is given
on operating line 50 under error code 120.
The flow alarm can be deactivated by entering --:--.
t
T
V
w
x
2540D12
t
A
t
A
t
A
t
1
t
2
y
t Time
t
1
Start of fault display
t
2
End of fault display
t
A
Waiting time (set on operating line 171)
TV Flow temperature
w Setpoint
x Actual value
Y Setpoint band
• At t
1
, error message is triggered; during the period of time t
A
(set on operating line
171), the actual value stayed below the setpoint band y
• At t
2
, the error message is reset; the actual value “x” has reached the setpoint band “y”
25.4.3 Manual overriding of operating mode (contact H1)
Using a simple remote operation facility, the operating mode of the heating circuit and
that of d.h.w. can be overridden. This is accomplished by bridging terminals H1
−M.
It is possible to select the operating mode to be used when H1
−M are bridged:
Setting Operating mode heating circuit Operating mode d.h.w.
0
Protection OFF
1
AUTO OFF
2
REDUCED OFF
3
NORMAL OFF
4
Protection ON
5
AUTO ON
6
REDUCED ON
7
NORMAL ON
8
AUTO ON (24 hours a day)
9
NORMAL ON (24 hours a day)
As long as this function is active, the LED of the respective operating mode button
flashes at a low frequency (approx. 0.5 Hz). The buttons themselves are however inop-
erable.
Once this function is deactivated, the RVL481 will resume the operating mode previ-
ously selected.
With plant types 4–x, 5–x, and 6–x, contact H1 only acts on the d.h.w. circuit.
25.4.4 Pump overrun
To prevent heat from building up, a common pump overrun time can be set for all
pumps associated with the controller (with the exception of the circulating pump) on
operating line 174. In that case, the pumps will overrun for the overrun time set, or the
changeover
valve will maintain the charging position during that period of time.