35
742.110 | 14.50
EN
10.3.11 Solid fuel boiler
T
T
F
unc
SET
off
Controls a pump in order to heat a storage tank using a solid fuel boiler.
The pump must be connected to output R1.
The pump is switched on when all of the following conditions are satis-
fied at the same time:
• The temperature difference between the solid fuel boiler and the
storage tank exceeds T
diff on
.
• The solid fuel boiler temperature lies above the min. solid fuel boiler
temperature.
• The storage tank temperature lies below the max. storage tank
temperature.
The pump is switched off when one the following conditions is satisfied:
• The temperature difference between the solid fuel boiler and the
storage tank drops below T
diff off
.
• The solid fuel boiler temperature drops below the min. solid fuel
boiler temperature.
• The storage tank temperature reaches the max. storage tank tem-
perature.
Speed control of the pump can be activated as required. The loading
strategy of the speed control system attempts to regulate the tempera-
ture of the solid fuel boiler to match the control target that has been set.
The control target should be at least 20 F above the minimum tempera-
ture of the solid fuel boiler.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
Pump type AC, HE
1) 2)
AC
Pump characteristics (only HE) bA, bb, C (see p. 14)
–
Speed control on, oFF
2)
oFF
Minimum speed (only AC) 30 % 100 % 50 %
Minimum speed (only HE + bA) 0 % 100 % 25 %
Minimum speed (only HE + bb) 0 % 100 % 75 %
Sensor input for storage tank
temperature
1 ... 5 –
Sensor input for solid fuel boiler
temperature
1 ... 5 –
Switch-on temperature difference
T
diff on
T
diff off
+ 4 F 40 F 12 F
Switch-off temperature difference
T
diff off
0 F T
diff on
– 4 F 6 F
T
F
unc
SET
max
Max. storage tank temperature 32 °F 300 °F 140 °F
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