Xylem ECOCIRC XL & XLplus - Manual (Page 23)

Function ecocirc XL
ecocirc
XLplus
ecocirc XLplus only
User Inter-
face or em-
bedded
I/O
Communi-
cation Bus
Wireless
communi-
cation
(optional)
Fault signal
(see sec-
tion 5.2.10)
X X X
External
pressure
sensor (see
section
5.2.11)
X X X
External
tempera-
ture sensor
(see sec-
tion 5.2.11)
X X
5.2.1 Control mode
Mode Description
Proportional pressure
2
Hset
Hset
The pump pressure is
continuously increased/
decreased depending
on the increased/
decreased flow de-
mand. The maximum
head of the pump can
be set via user interface.
See section 6.1.2
Change set point.
Constant pressure
Hset
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 6.1.2
Change set point.
Fixed speed control
Max
min
Speed
setpoint
The pump maintains a
fixed speed at any flow
demand. The speed of
the pump can be set via
user interface. See sec-
tion 6.1.2 Change set
point.
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 sys-
tem is not running. An algorithm detects the prop-
er 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
pumped media.
For details refer to advanced functions manual on
www.lowara.com
5.2.4 ∆p-∆T control (available only on
ecocirc XLplus)
This function requires the external temperature
probe type KTY83 (see section 5.2.9 of this man-
ual).
This function alters the nominal differential pres-
sure set point depending on the differential tem-
perature of the pumped media.
For details, refer to the advanced functions manual
on www.lowara.com
5.2.5 T constant (available only on ecocirc
XLplus)
This function alters the speed of the pump in order
to maintain a constant temperature of the pumped
media.
For details, refer to the advanced functions manual
on www.lowara.com
5.2.6 ∆T constant (available only on
ecocirc XLplus)
This function alters the speed of the pump in order
to maintain a constant differential temperature of
the pumped media.
For details, refer to the advanced functions manual
on www.lowara.com
5.2.7 External start/stop
The pump can be started or stopped via an exter-
nal potential-free contact or a relay that is connect-
ed to terminal 11 and 12. See Figure 18 and Figure
19 . The pump unit is provided by default, with the
terminals 11 and 12 short-circuited.
NOTICE:
• The pump provides 5 VDC through the start /
stop terminals.
• No external voltage must be provided to start /
stop terminals.
• The cables connected to the terminals 11 and
12, shall not exceed 20 m.
en - Translation of the original instructions
23