Xylem Bell & Gossett Ecocirc XL Installation, Operation And Maintenance Manual page 10

5 System Description
4.7.2 I/O connections
1. Open the terminal box cover removing the screws (5). Refer to fig-
ure 2 on page 7. Use control screwdriver described under section
4.2 to access terminal blocks.
2. Connect the appropriate wires according to the terminal block di-
agram and the requirements of section
(page 8) given below in section 4.7.3.
3. Close the terminal box cover.
• For a two-pump connection, wire them through a communication
cable connecting the 2 RS-485 ports at the pumps to terminals 15,
16 & 17.
4.7.3 Connection assignment
• For all electrical connections use heat resistant wires or cable rat-
ed for at least 194°F (90°C). The cables should not touch the mo-
tor housing, the pump or the piping.
• Power and control wires must be run in separate channels.
• Metal conduit for power wiring must only be attached to 1/2" NPT
conduit fitting.
NOTICE:
Cable glands are only available for low voltage wiring to protect
against cable slippage and vapor ingress into the terminal box.
5 System Description
5.1 User interface
5
7
8
6
9
Figure 5: User interface diagram
1. Control mode button
2. Control mode indicators
3. Parameter button
4. Parameter indicators
5. Setting buttons
6. Numeric display
7. Power indicator
8. Status / Fault indicator
9. Remote control indicator
Hot Surface:
Burn hazard. During the normal operation, the pump surfa-
ces may be so hot that only the buttons should be touched to
avoid burns.
5.1.1 User interface locking/unlocking
The user interface will automatically lock if no button is pressed for ten
minutes, or if the upper setting button (5) and the parameter button (3)
are pressed for two seconds. See
If a button is pressed when the user interface is locked, the display (6)
shows:
8
Connection assignment
4
3
2
1
User interface (page 8).
To unlock the user interface, press the upper setting button (5) and the
parameter button (3) for two seconds. The display (6) will show:
Now it is possible to change the pump setting as required.
5.2 Functions
The main functions of the pump and control modes are selectable
through the pump user interface and the embedded I/O. Advanced
functions or communication features, can only be set via bus protocol
or the optional Wireless module. See the electronic drive manual at
www.bellgossett.com.
5.2.1 Control mode
Mode
Constant pressure
Hset
Proportional pressure
Hset
Hset
2
Fixed speed control
Max
Speed
setpoint
min
All the above control modes can be combined with the night mode
function.
5.2.2 Night mode
The night mode cannot be used in cooling systems.
Prerequisite
• The pump is installed between boiler outlet and system supply.
• The night mode feature is initiated when the pump recognizes a
water temperature change brought about by the boiler or high
level control system.
The night mode is active only in combination with:
• Proportional pressure
• Constant pressure
• Fixed speed
This function reduces power consumption of the pump to the minimum
when heating system is not running. An algorithm detects the water
temperature change and automatically adjusts the speed of the pump.
The pump returns to the original set point as soon as the system re-
starts.
5.2.3 ∆p-T control
This function adjusts the nominal differential pressure set point accord-
ing to the temperature of the pumped media.
For details refer to the electronic drive manual on www.bellgos-
sett.com
5.2.4 T-Constant temperature control
This functional mode changes the speed of the pump in order to main-
tain a constant temperature of the pumped media. It is suitable for
ecocirc ® XL Installation, Operation, and Maintenance manual
Description
The pump maintains a constant
pressure at any flow demand. The
desired head of the pump can be
set via user interface. See section
6.1.2 Change set point.
The pump pressure is continuous-
ly increased/decreased depend-
ing on the increased/decreased
flow demand. The maximum head
of the pump can be set via user in-
terface. See section 6.1.2 Change
set point.
The pump maintains a fixed speed
at any flow demand. The speed of
the pump can be set via user inter-
face. See section 6.1.2 Change set
point.