Xylem ECOCIRC XL, XLplus Electronic drive - Manual (Page 15)

6 Accessories
6.1 External Temperature Sensor
As briefly described in par. 2.5.5, the circulator can be
equipped with an external KTY83 temperature probe
(1K
Ω at 25 
C), with the purpose of measuring an
absolute or a differential water temperature, in
temperature dependent / influenced control modes.
6.1.1 Water Temperature dependent
Control Modes – Setting parameters
The subset of parameters collected in Parameters
Table 2 (described in par. 8.2.1.2) is devoted to set the
Water Temperature dependent Control Modes; in
particular:

0x0030 - Temperature Control Mode
Defines if there’s a dependency of the control
modes on the temperature, and which kind of
dependency
o [= 0] 
None of the standard control mode
(described in par. 4.3.3) is affected or
influenced by the water temperature
o [= 1] 
The control modes usually
managing the differential pressure control,
Constant Pressure [Const

P] (see par.
4.3.3.1) and Proportional Pressure
[Prop

P] (see par. 4.3.3.2), are influenced
by water temperature ([Const

P]/T and
[Prop

P]/T)
o [= 2] 
The active control mode is
Constant Absolute Temperature [ConstT]
or Constant Differential Temperature
[Const

T], depending on the value of
Parameter “0x0033 – Temperature Probe”

0x0031 – Absolute Temperature Setpoint
The set-point followed by the system when
operating in Constant Absolute Temperature
[ConstT]

0x0032 – Differential Temperature Setpoint
The set-point followed by the system when
operating in Constant Differential Temperature
[Const

T]

0x0033 – Temperature Probe
Defines which temperature probe must be
considered as input for the temperature-
dependent control mode selected
o [= 0] 
The control mode uses the internal
temperature probe’s input signal
o [= 1] 
The control mode uses the
auxiliary (external) temp erature sensor’s
input signal (the external temperature
sensor must be connected)
o [= 2] 
The control mode calculates the
differential temperature between the
internal and the external sensor, and uses
the differential temperature as input signal
(the external temperature sensor must be
connected)

0x0034 – Temperature Slope
Defines how the Head set-point (when
Constant
ΔP/T or PropΔP/T control modes are
active ) reacts to the water temperature’s
increase/decrease
o [= 0] 
The Head set-point increases
when the temperature increases
o [= 1] 
The Head set-point decreases
when the temperature increases

0x0035 – K
p
for Temperature Control
Is the proportional constant used in the PI-
regulator which leads the temperature control

0x0036 – K
i
for Temperature Control
Is the integral constant used in the PI-regulator
which leads the temperature control

0x0037 – Temperature Control sampling time
Sampling time used in the temperature control
6.1.2 Water Temperature dependent
Control Modes
Using the setting parameters described in par. 6.1.1,
the Water Temperature dependent Control Modes are
then the following:
6.1.2.1 Constant Absolute Temperature [ConstT]
This control mode ensures a constant water
temperature. Constant temperature is a comfort control
mode that can be used in domestic hot-water systems
to control the flow to maintain a fixed temperature in
the system
In this control mode, the basic assumption is that the
circulator regulates (following the feedback of the
internal or external temperature sensor) the water
temperature in a point, on the return pipe of the
system, as close as possible to the consumer
(ra
diator, heat exchanger, …).
It is then clear that the ConstT control mode can be
deployed in the subsequent possible application
o ConstT for heating 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 [20°C ÷ 110°C]
- 0x0033 – Temperature Probe = 0
- 0x0034 – Temperature Slope = 1