Control Mode; Night Mode - Lowara ecocirc XL Original Instructions Manual

Function ecocirc XL
ecocirc
XLplus
User Inter-
face or em-
bedded I/O
Constant X
speed (see
section
5.2.1)

Night mode

X
(see sec-
tion 5.2.2)
∆p-T con-
trol (see
section
5.2.3)
T Constant
(see sec-
tion 5.2.4)
∆T Con-
stant (see
section
5.2.5)
External X
Start/stop
(see sec-
tion 5.2.6)
Analog in- X
put (see
section
5.2.8)
Fault signal X
(see sec-
tion 5.2.9)
External X
pressure
sensor (see
section
5.2.10)
External
tempera-
ture sensor
(see sec-
tion 5.2.10)

5.2.1 Control mode

ecocirc XLplus only
Communi- Wireless
cation Bus communi-
cation
(optional)
X X
X X
X X
X X
X X
X X
X X
X X
X X
X X
Mode
Proportional pressure
Hset
Hset
2
Constant pressure
Hset
Fixed speed control
Max
Speed
setpoint
min
All the control modes can be combined with the
night mode function.
5.2.2 Night mode
The night mode function cannot be used in cooling
systems.
Prerequisite
• The pump is installed in the supply line.
• The night condition can be detected with good
confidence if a higher-level control system is set
to change the supply temperature.
The night mode can be active in combination with:
• Proportional pressure
• Constant pressure
• Constant speed
This function reduces the power consumption of the
pump to the minimum when the heating system is
not running. An algorithm detects the proper working
conditions and automatically adjusts the speed of
the pump.
The pump returns to the original set point as soon as
the system restarts.
5.2.3 ∆p-T control (available only on
ecocirc XLplus)
The function alter the nominal differential pressure
set point depending on the temperature of the pump-
ed media.
For details refer to advanced functions manual on
www.lowara.com
5.2.4 T constant (available only on ecocirc
XLplus)
en - Original instructions
Description
The pump pressure is
continuously increased/
decreased depending on
the increased/decreased
flow demand. The maxi-
mum head of the pump
can be set via user inter-
face. See section 6.1.3.
The pump maintains a
constant pressure at any
flow demand. The de-
sired head of the pump
can be set via user inter-
face. See section 6.1.3.
The pump maintains a
fixed speed at any flow
demand. The speed of
the pump can be set via
user interface. See sec-
tion 6.1.3.
23