Xylem ECOCIRC XL, XLplus Electronic drive - Manual (Page 10)

LEDs  are not lit. Only the Power, Status and
Remote LEDs (  ,  and  ) remain active
according to what described in par. 4.1.
4.3.2.2 Off

On
1. Press shortly the Up arrow button 
The Numeric display  , the Parameters LEDs 
and the Control mode LEDs  returns to show the
information according to the last settings before
the Off operating mode selection
2. Change the set point value with the Setting
buttons 
After the transition from Off to On operating mode,
the set point (related to the actual control mode) is
equal to the minimum value: change it if
necessary.
4.3.3 Control Modes
Referring to Figure 10 (in case of plug-connected
models) and to Figure 11 (in case of terminal-
connected models), short press the Control mode
button
 to select the desired control mode, following
this logical flow:
NOTICE
All the control modes can be combined with the Night
Mode function (see par. 4.3.4.1)
4.3.3.1 Constant Pressure (Head)
The circulator maintains a constant pressure at any
flow demand;
for setting up the desired head of the pump (H
set
), see
par. 4.3.1.
When Constant Pressure (which is the factory setting)
is the selected control mode, the indicator is
permanently lit
If the hydraulic working point allows the circulator to be
operated by regulating the head within the electric
power limits, then the target head will coincide with the
desired (set) head.
If the hydraulic working point requires the circulator to
be operated at a working point that exceeds the
electric power limits, then the target head will be de-
rated to remain within the maximum power limitation
curve.
4.3.3.2 Proportional Pressure (Head)
The circulator pressure is continuously
increased/decreased depending on the
increased/decreased flow demand;
for setting up the desired maximum head of the pump
(H
set
), see par. 4.3.1.
When Proportional Pressure is the selected control
mode, the indicator is permanently lit
If the hydraulic working point allows the circulator to be
operated by regulating the head within the electric
power limits, then the target head will coincide with the
desired (set) head.
If the hydraulic working point requires the circulator to
be operated at a working point that exceeds the
electric power limits, then the target head will be de-
rated to remain within the maximum power limitation
curve.
4.3.3.3 Fixed speed
The circulator maintains a fixed speed at any flow
demand;
for setting up the desired speed of the pump, see par.
4.3.1.
When Fixed Speed is the selected control mode, the
indicator is permanently lit
If the hydraulic working point allows the circulator to be
operated by regulating the speed within the electric
power limits, then the target speed will coincide with
the desired (set) speed.
If the hydraulic working point requires the circulator to
be operated at a working point that exceeds the
electric power limits, then the target speed will be de-
rated to remain within the maximum power limitation
curve.
4.3.4 Special Functions
4.3.4.1 Night Mode
The Night Mode function cannot be used in cooling
systems.
Prerequisites:

The circulator is installed in the supply line