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Adjustable parameter (max. temperature)
High limit safety cut-out (STB)
1)
Temperature regulator (TR)
Max. boiler water temperature
2)
Max. temperature demand
Table 9 Adjustable parameters CFB 910 and CFB 840
1) Set the high limit safety cut-out and temperature controller as high as possible, but ensure the settings are at least 5 K apart.
2) Both temperature demands must always be at least 7 K below the maximum boiler water temperature.
3) The temperature demand of heating circuits fitted with a mixing valve is composed of the set flow temperature and parameter "Boiler rise" in the heating circuit data
menu.
4) The temperature demand of DHW heating is composed of the set DHW temperature and parameter "Boiler rise" in the DHW menu.
Settings for boiler water regulator and maximum boiler water
temperature
The boiler water regulator is only designed to allow emergency operation
with an adjustable boiler water temperature if the control electronics
Control unit settings
Fig. 4 Control unit settings
[1]
High limit safety cut-out
[2]
Temperature regulator
[3]
MEC
B Select temperatures (
table 9, page 11) at high limit safety cut-out
[1] in the control unit and at temperature controller [2].
B Select the maximum boiler water temperature at the MEC [3].
The maximum temperature demand is not a value that is
directly selected. The maximum temperature demand is
composed of the set temperature and the rise.
Uni Condens 6000F
1)
3)
4)
of HC
and DHW
80
1
2
Information on installation and operation | 11
If the Bosch CFB control unit is used, burner modulation
in standard mode is not enabled for 3 minutes. Never
modulate upwards more quickly than this.
CFB 910
CFB 840
110 °C
110 °C
↓↑ minimum 5 K ↓↑
105 °C
90 °C
↓↑ minimum 6 K ↓↑
99 °C
84 °C
↓↑ minimum 7 K ↓↑
92 °C
77 °C
fail. In standard control mode, the function of the boiler water regulator
is provided by the maximum boiler water temperature. The maximum
boiler water temperature can be selected in the control unit in the "Boiler
parameters" menu, under menu item "Max. shutdown temperature".
3
Example DHW demand (where the 4000 series controls the DHW
system):
Sum of the set DHW temperature (60 °C) and parameter "Boiler rise"
(20 °C) in the "DHW" menu:
60 °C + 20 °C = Maximum temperature demand 80 °C
Example heating circuits (where the 4000 series controls the
heating circuits):
Add of the set temperature of the heating circuit with mixing valve with
the highest temperature required (70 °C) and parameter "Boiler rise"
(5 °C) in the "Heating circuit data" menu:
70 °C + 5 °C = Maximum temperature demand 75 °C
All maximum temperature demands must always be 7 K
below the maximum selected boiler water temperature.
↑
minimum 18 K
↓
6 720 648 053-38.2T
6 720 803 637 (2012/03)
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