Xylem Bell & Gossett Ecocirc+ 20-18, Installation, Operation And Maintenance Manual

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Mode Description
Constant pressure that depends on the
water temperature, ConstΔP/T
Changes the setpoint of the differential constant pressure
according to the measured water temperature
This mode is used in the following applications:
• Uses the external temperature sensor for positive
relation, P/T
• Uses the external temperature sensor for negative
relation, P/T
• Uses the external temperature sensor for positive
relation, P/T
• Uses the external temperature sensor for negative
relation, P/T
Proportional pressure that depends on
the water temperature
Changes the setpoint of the differential proportional
pressure according to the measured fluid temperature
This mode is used in the following applications:
• Uses the external temperature sensor for positive
relation, P/T
• Uses the external temperature sensor for negative
relation, P/T
• Uses the external temperature sensor for positive
relation, P/T
• Uses the external temperature sensor for negative
relation, P/T
Alarm code
When there is a fault in the temperature sensor, the following alarm code is
shown in the user interface:
Sensor Alarm code
Water temperature A06
4.2.4.2 Control mode for analog voltage input
Analog Voltage input recognizes automatically the presence of a valid 0-10V
signal (see thresholds, referred to pump status, on the table below).
Mode Description
Rotational speed that the VDC input controls at
terminals 3 and 4
Uses the external control voltage input to control
the speed of the pump
The speed of the pump is maximum at 10 VDC and
minimum at 1.5 VDC.
For more information, see
Pump status on page
20.
4 Installation
20-18 Installation, Operation, and Maintenance Manual 19