T Constant; External Start/Stop; Analog Input; Signal Relay - Bell & Gossett ecocirc XL Manual De Instalación, Operación Y Mantenimiento

heating systems with fixed system characteristics, for example Domes-
tic Hot Water Systems.
For details, refer to the electronic drive manual on www.bellgos-
sett.com
5.2.5 ∆T constant
This function alters the speed of the pump in order to maintain a con-
stant differential temperature of the pumped media.
For details, refer to the electronic drive manual on www.bellgos-
sett.com

5.2.6 External start/stop

The pump can be started or stopped via an external dry contact or a
relay that is connected to terminals 11 and 12. The pump unit is provid-
ed by default, with the terminals 11 and 12 jumpered. See Figure 4 on
page 8.
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 terminals 11 and 12 shall not exceed 65
feet in length.

5.2.7 Analog Input

The pump integrates a 0-10 V analog input at terminals 7 and 8. See
terminal diagram figures for changing the setpoint. See Figure 4 on
page 8.
When a voltage input is detected, the pump switches to fixed speed
control mode automatically and starts to run according to the following
diagram:
Speed
[rpm]
Max
Setpoint
min
1.2 1.5 Vset 10
Figure 6: Voltage input detected
Pump stops at 1.2 V
Pump restarts at 1.5 V

5.2.8 Signal relay

A dry contact relay is provided at terminals 4 and 5. See connection di-
agram, figure 4 on page 8, for location. If there is a fault, the relay con-
tact closes to display a red status light and the error code on the user
interface display. See User interface
can also be used to energize a remote fault display.
Ratings
• Voltage: 115/208 – 230/1
• Imax < 2 A

5.2.9 External sensors (optional)

The pump can be equipped with a differential pressure sensor and a
temperature sensor according to the following table:
Sensor description Type
Differential pressure 15 PSI
sensor 4-20mA
30 PSI
Temperature sensor KTY83
Pressure sensor setup
1. Install pressure sensor on the pipe
2. Connect wires at terminals 9 and 10. See Figure 4 on page 8.
ecocirc ® XL Installation, Operation, and Maintenance manual
Vin[V]
(page 8). The relay contact closure
Terminals
9 - 10
13 - 14
3. Power the pump on.
4. Upon startup, the pump detects the sensor and displays the setup
menu.
5. Select the right sensor model and confirm the selection using the
parameter button (3). See
6. The pump will run through the startup sequence and automatical-
ly start working in constant pressure mode.
7. The setpoint can be changed using the settings button (5). See
User interface (page 8).
External temperature sensor setup
The external temperature sensor setup and related control modes are
available only through RS-485 or wireless module connection.
For details refer to the electronic drive manual on www.bellgos-
sett.com
Wireless module
The wireless module is an optional module, to be coupled with the
ecocircXL circulators. When correctly configured, it generates a wire-
less network accessible by a mobile device, tablet or a personal com-
puter. See wireless module instructions manual for details.

5.2.10 Communication bus

The pump has a built-in RS-485 communication channel (terminals
15-16-17). See Figure 4 on page 8.
The pump can communicate with external BMS systems via Modbus or
BACnet protocol. For a complete description of the protocols, refer to
the electronic drive manual at www.bellgossett.com.
NOTICE:
When remote control is active, the set points and control modes are
managed only through communication channels and cannot be
changed via the user interface. The displayed quantity and unit of
measurement remain active on the user interface.

5.2.11 Automatic two-pump operation

Backup operation (bcup)
Only the lead pump runs. The second pump starts in case of failure of
the lead pump.
Alternate operation (alte)
Only one pump runs at a time. The working time is switched every 24
hours so that workload is balanced between both pumps. The second
pump is started immediately in case of failure of the lead pump.
Automatic parallel operation (para)
Both pumps run simultaneously at the same set point. The lead pump
determines the behavior of the full system and is able to optimize the
performance. To guarantee the required performance with the mini-
mum power consumption, the lead pump starts or stops the lag (sec-
ond) pump to satisfy system requirement of flow and head.
Forced parallel operation (forc)
Both pumps run simultaneously with the same set point. The master
pump determines the behavior of the full system.

6 System Setup and Operation

Precaution
CAUTION:
Always wear protective gloves when handling the pumps and
motor. When pumping hot liquids, the pump and its parts
may exceed 40°C (104°F).
NOTICE:
The pump must not run dry as this can result in the destruction of the
bearings. Fill the system correctly with liquid and vent the air before
first start-up.
6 System Setup and Operation
User interface (page 8).
9