Xylem ECOCIRC XL, XLplus Electronic drive - Manual (Page 16)

o ConstT, for heating applications, using
external temp. sensor
In this application the pump is installed in the flow
pipe, and utilizes the external temp. sensor
According to what described in par. 6.1.1, the
necessary correspondent settings are:
- 0x0030 - Temperature Control Mode = 2
- 0x0031
– Absolute Temperature Setpoint =
desired value in the range [20°C ÷ 110°C]
- 0x0033 – Temperature Probe = 1
- 0x0034 – Temperature Slope = 1
o ConstT, in cooling applications, using internal
temp. sensor
In this application the pump is installed in the
return pipe, and utilizes the internal temp. sensor
According to what described in par. 6.1.1, the
necessary correspondent settings are:
- 0x0030 - Temperature Control Mode = 2
- 0x0031
– Absolute Temperature Setpoint =
desired value in the range [-10°C ÷ 19°C]
- 0x0033 – Temperature Probe = 0
- 0x0034 – Temperature Slope = 0
o ConstT, in cooling applications, using external
temp. sensor
In this application the pump is installed in the flow
pipe, and utilizes the external temp. sensor
According to what described in par. 6.1.1, the
necessary correspondent settings are:
- 0x0030 - Temperature Control Mode = 2
- 0x0031
– Absolute Temperature Setpoint =
desired value in the range [-10°C ÷ 19°C]
- 0x0033 – Temperature Probe = 1
- 0x0034 – Temperature Slope = 0
6.1.2.2 Constant Differential Temperature
[Const
ΔT]
This control mode keeps the differential temperature of
the pumped liquid constant, changing the flow rate to
maintain the user-settable set-point
In this case, it’s unnecessary to discriminate between
heating
and cooling application, because the
differential temperature is considered as absolute
value.
According to what described in par. 6.1.1, the
necessary correspondent settings are:
- 0x0030 - Temperature Control Mode = 2
- 0x0032
– Differential Temperature Setpoint =
desired value
- 0x0033 – Temperature Probe = 2
6.1.2.3 Constant pressure depending on water
temperature [Const
ΔP/T]
In this control mode the drive alters the differential
pressure set-point the pump has to maintain,
depending on the measured fluid temperature, as
depicted in
Figure 3
Figure 3
Referring to Figure 3

Tmin = 20

C

Tmax = Absolute Temperature Setpoint (par.
0x0031)

Hsmin = 30% of Hsmax

Hsmax = Constant pressure set-point (settable
via User Interface, see par. 4.3.3.1)
The Const
ΔP/T control mode can be evidently
deployed in the subsequent possible application
o Const ΔP/T, positive relation P/T, using internal
temp. sensor
According to what described in par. 6.1.1, the
necessary correspondent settings are:
- 0x0030 - Temperature Control Mode = 1
- 0x0031
– Absolute Temperature Setpoint =
desired value
- 0x0033 – Temperature Probe = 0
- 0x0034 – Temperature Slope = 0
- Control Mode = Constant Pressure (settable
via User Interface)
- Constant Pressure Setpoint = desired value
o Const ΔP/T, negative relation P/T, using internal
temp. sensor
According to what described in par. 6.1.1, the
necessary correspondent settings are:
- 0x0030 - Temperature Control Mode = 1
- 0x0031
– Absolute Temperature Setpoint =
desired value
- 0x0033 – Temperature Probe = 0
- 0x0034 – Temperature Slope = 1
- Control Mode = Constant Pressure (settable
via User Interface)
- Constant Pressure Setpoint = desired value
o Const ΔP/T, positive relation P/T, using external
temp. sensor
According to what described in par. 6.1.1, the
necessary correspondent settings are:
- 0x0030 - Temperature Control Mode = 1
- 0x0031
– Absolute Temperature Setpoint =
desired value
- 0x0033 – Temperature Probe = 1
- 0x0034 – Temperature Slope = 0
- Control Mode = Constant Pressure (settable
via User Interface)
- Constant Pressure Setpoint = desired value