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742.114 | 14.50
EN
10.3.4 Solid fuel boiler
Controls a pump in order to heat a storage tank using a solid fuel boiler.
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 of 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
Output (pump) free output R1/R2/R
S
–
Pump type (R1, R2 only) AC, HE
1) 2)
AC
Pump characteristic (HE only) bA, bb, C (see p. 16) –
Speed control (R1, R2 only) on, oFF
2)
oFF
Minimum speed (AC only) 30% 100% 50%
Minimum speed (HE + bA only) 0% 100% 25%
Minimum speed (HE + bb only) 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
Max. storage tank temperature 32 °F 300 °F 140 °F
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