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Functions
WE Configuration
Current input for flow rate
measurement
OFF FB22 = OFF
Flow rate or capacity limitation OFF
500 pulse/h
1.0
500 pulse/h
1.0
FB23 = ON
Max. limit / 3 to 500 pulse/h
Limiting factor / 0.1 to 10
Max. limit for DHW/3to500pulse/h
Limiting factor / 0.1 to 10
7.10.2 Limitation using 0/4 to 20 mA signal
A connected heat meter (terminals GND/15 with a 50
Ω
resistor connected in parallel) with a
0/4 to 20 mA output can be used to limit the flow rate in the system. All limit values are given in
the unit “cubic meters per hour“ [m
3
/h]. As a result, it is necessary to se in addition to
Lower
measuring range value
0 or 4 mA also an
Upper measuring range value
(flow rate at whichthe
20 mA signal is issued) in unit [m
3
/h]. When the flow rate reaches the current
Maximum limit
,
the controller switches in control circuit RK1 to flow rate control with the
Maximum limit
acting
as the set point. If the flow temperature exceeds its normal set point by more than 5 °C during
this time, the flow temperature control is started again. If the flow rate falls below the set
Mini-
mum limit,
the control valve of control circuit RK1 is temporarily closed. The normal control op-
eration is started again when the flow temperature falls below its normal set point by 5 °C.
Note!
In systems Anl 4 to 6 and 11, the valve of the heating circuit is affected during an active flow
rate limitation.
Functions
WE Configuration
Current input for flow rate measurement OFF FB22 = ON, select “Lower measuring range”
Flow rate or capacity limitation OFF
10.00 m
3
/h
0.01 m
3
/h
9.00 m
3
/h
FB23 = ON
Upper measuring range / 0.1 to 650 m
3
/h
Minimum limit/ 0.01 to 650 m
3
/h
Maximum limit / 0.01 to 650 m
3
/h
7.11 Locking manual levels
The number of access options to the controller can be restricted by locking the manual level.
When the locking is active, the mode switches positioned at the manual mode do not have any
effect concerning manual activation of the valves. Merely, reactions occur as if the mode
62 EB 5476 EN
System-wide functions