18
LRS 1-7
Operation
Start
Mains voltage L is
applied
Indication of actual value X,
LED 1 illuminated, LED 4 flashing
The continuous blowdown valve is
operated and opened for 240 seconds.
After 240 sec.:
Actual value < setpoint
Indication of actual value X,
LEDs 1 and 5 illuminated
The continuous blowdown valve is
motored into the OPERATING position.
After 240 sec.:
Actual value > setpoint
Indication of actual value X,
LEDs 1 and 4 illuminated
The continuous blowdown valve is
motored into the OPEN position.
Once the conductivity has fallen by
–10 % of the setpoint the valve is
motored into the OPERATING position.
Operation
Indicate setpoint W
Press button
, LED 2 is illumi-
nated and setpoint W indicated
Indicate MAX limit
Press button
, MAX limit is
indicated.
Indicate water tempera-
ture / remaining time of
purging interval
Press button
E
, the indication
toggles between the fluid tem-
perature* and the remaining
purging interval **
* Indication of fluid temperature if
parameter
4. PT 100
is set to
ON.
** Indication of remaining time if
parameter
7. Purging interval
has been
activated.
Actual value X < set-
point W
Indication of actual value X,
LEDs 1 and 5 illuminated
Continuous blowdown valve in
OPERATING position
Actual value X > set-
point W
Indication of actual value X,
LEDs 1 and 4 illuminated
The continuous blowdown valve is
motored into the OPEN position.
Once the conductivity has fallen by
–10 % of the setpoint the valve is
motored into the OPERATING position.
MAX limit exceeded
Indication of actual value X,
LEDs 1, 3 and 4 illuminated
Output contact P 3, 1 / 2 open, 2 / 3
closed. The continuous blowdown valve
is motored into the OPEN position.
Burner is switched off
(stand-by operation)
The continuous blowdown valve is
motored into the CLOSED position.
Note
The continuous blowdown valve is equipped with three limit switches for the positions
OPEN, CLOSED and OPERATING. In the adjustable OPERATING position the continuous
blowdown valve is somewhat open. A certain amount of boiler blowdown is discharged
from the boiler in order to keep the TDS (= total dissolved solids) level below the limit.
The amount of boiler blowdown can be ascertained by means of the capacity charts for
the continuous blowdown valve. Please observe the installation instructions of the
GESTRA continuous blowdown valve.
