Pag. 39 / 44
DMAN802000066-SY250 Idro 4/8 Buttons Manual
To avoid freezing, the Pump is On if the water temperature is below the thermostat
Th18
. If the water
temperature exceeds the value of the
Th21
thermostat for safety reasons the pump is always active.
Sanitary Water Plant
When there is a water demand for domestic use and the water temperature in the boiler exceeds the value
of
Th19
thermostat or the water temperature in the boiler exceeds the
Th20
thermostat’s value the Pump
P2 is on. If water temperature exceeds the value of the
Th21
thermostat the Pump P2 is turned off.
Example
:
Th18
= 5 °C,
Th19
= 40 °C,
Th20
= 30 °C,
Th21
= 70 °C
Water Temperature
Flow Switch
Modality
Pump P2
Pump P1
T < 5°C
OFF
ON
5°C ≤ T< 30°C
OFF
OFF
30°C ≤ T< 40°C
ON
OFF
40°C ≤ T< 70°C
Open
Winter
OFF
ON
Summer
OFF
Close
ON
OFF
T≥70°C
OFF
ON
CONFIGURATION 2
Setting the parameter
P26
=2 it is chosen the configuration shown in Fig.5.
S1
S2
P1
P2
B
O
IL
E
R
SA
N
IT
.
fig. 5
Heating Plant
The pump P1 is activeted if the water temperature in the boiler exceeds the value of
Th20
thermostat and
the water temperature in the boiler doesn’t exceed the value of Boiler Thermostat
Th58
and the difference
between the read temperature by probe S1 and S2 probe is greater than the
Th57
thermostat.
The Pump is On if the water temperature is greater than
Th19
Thermostat. To avoid freezing, the Pump is
On if the water temperature is below the thermostat
Th18
.
If the water temperature exceeds the value of the
Th21
thermostat for safety reasons the Pump is always
active.
Sanitary Water Plant
If boiler water temperature is lower than
Th58
thermostat, is higher than
Th20
thermostat and the
differential temperature between S1 probe and S2 probe is over than
Th57
thermostat the Valve P2 is
active. If the water temperature exceeds the value of the
Th21
thermostat the valve P2 is turned off.
Example
:
Th18
= 5 °C,
Th19
= 65 °C,
Th20
= 50 °C,
Th21
= 70 °C,
Th57
= 5 °C,
Th58
= 55 °C
Temp. Probe S1 Temp. Probe S2 Modality Differential
Valve P2
Pump P1
T < 5°C
Plant (OFF)
ON
5°C < T< 50°C
Plant (OFF)
OFF
50°C < T< 65°C
T < 55°C
< 5°C
Plant (OFF)
OFF
≥ 5°C
Sanitary
(
ON
)
ON
T > 55°C
< 5°C
Plant (OFF)
OFF
Winter
≥ 5°C
Plant (OFF)
OFF
Summer
≥ 5°C
Sanitary
(
ON
)
ON
65°C < T< 70°C
T < 55°C
< 5°C
Plant (OFF)
OFF
≥ 5°C
Sanitary
(
ON
)
ON
T > 55°C
Winter
Plant (OFF)
ON
Summer
< 5°C
Plant (OFF)
OFF
Summer
≥ 5°C
Sanitary
(
ON
)
ON
T>70°C
Plant (OFF)
ON
