Control Unit Settings - Bosch Uni Condens 8000 F Installation And Maintenance Instructions Manual

▶ Secure all cables with cable clips (supplied with the control unit):
– Insert the cable clip together with the cable from above into the
slots in the frame ( fig. 27, page 27).
– Slide the cable clip downwards.
– Counterhold.
– Flip the lever up.
.
.
Fig. 27 Securing a cable with a cable clip
▶ Refit the cover hood on the control unit ( fig. 7.2.1, page 26).
▶ Secure the control unit cover hood by tightening the screws
( fig. 25, page 26).
7.2.3

Control unit settings

If a control unit from the CFB 800/CFB 900 series is used, burner
modulation in standard mode is not enabled for 2.5 minutes.
▶ Avoid fast upwards modulation.
Regulator settings
Adjustable CFB 810
parameter
(max. temperature)
High limit safety cut- 110 °C
1)
out (STB)
 at least 5 K
Temperature 105 °C
1)
controller (TR)  at least 6 K
Max. boiler water 99 °C
temperature
 at least 7 K
Max. temperature 92 °C
2)
demand of heating
3) 4)
circuit and DHW
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 under the maximum
boiler temperature.
3) The temperature demand of heating circuits equipped with an actuator is
composed of the set flow temperature and the "return temperature increase"
parameter in the heating circuit data menu.
4) The temperature demand of DHW heating is composed of the set DHW
temperature and parameter "return temperature increase" in the DHW menu.
Table 12 Adjustable parameters for CFB 810 and CFB 840
Uni Condens 8000 F – 6720867056 (2016/10)
.
.
.
6720615883-31.1RS
CFB 840
110 °C

90 °C
at least 18 K

84 °C
77 °C
Set boiler temperature controller and maximum boiler temperature
The boiler temperature controller ensures emergency operation with an
adjustable boiler water temperature if the control electronics fail. In
standard control mode, the maximum boiler temperature adopts the
function of the boiler temperature controller. The maximum boiler water
temperature can be selected in the control unit in the "Boiler
parameters" menu, under menu item "Max. shutdown temperature".
Control unit settings
80
1 2
Fig. 28 Control unit settings
[1] High limit safety cut-out
[2] Temperature controller
[3] MEC2
▶ Select temperatures ( tab. 12, page 27) at high limit safety cut-out
[1] in the control unit and at temperature controller [2].
▶ Select the maximum boiler water temperature at the MEC2 [3].
The maximum temperature demand is not a value that is set directly. The
maximum temperature demand is composed of the set temperature and
the rise.
Example DHW demand:
Sum of the set DHW temperature (60 °C) and the parameter "return
temperature increase" (20 °C) in the "DHW" menu:
60 °C + 20 °C = maximum temperature demand 80 °C.
Example heating circuits:
Sum of the set temperature of the heating circuit with mixer with the
highest temperature required (70 °C) and the parameter "return
temperature increase" (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.
Control unit
3
0010011563-001
27