Rename The Heating Circuit; Setting The Low End Temperature; Setting The Design Temperature - Bosch CFB 840 Servicing Instructions

Input range
Heating system none
Radiator
Convector
Underfloor
Constant
Low end
Room controller
Table 38 Setting range Heating system

10.2 Rename the heating circuit

Instead of the designation Heat.circuit + No. another name can be
selected from a list provided.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu Heat.circuit + No. is displayed.
B Press Display to call up a submenu.
B Turn the rotary dial until submenu Heating circ. desig. appears.
HEAT CIRC. DATA
Heat circ desig.
Fig. 27 Rename the heating circuit
B Hold down button Display and turn the rotary dial until the required
value is shown.
B Release Display to save your input.
B Press Back to return to the next higher level.
Input range
Heat circ. desig Heating circ.
Apartment
Underfloor
Bathroom
Swimming pool
Floor
Cellar
Building
Table 39 Setting range Heating circuit name

10.3 Setting the low end temperature

This function will only be displayed for "Low end" heating systems.
By setting the heating system to Low end, the system is set to a straight
heating curve using the low end and design temperatures.
The base point [Low end] temperature determines the start of the
heating curve. The low end temperature is applicable for an outside
temperature of 20 °C.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu Heat.circuit + No. is displayed.
B Press Display to call up a submenu.
B Turn the rotary dial until submenu Heating system appears.
B Hold down button Display and turn the rotary dial until the required
value is shown.
B Release Display to save your input.
CFB 840
Factory setting
Radiator
2
Heating circ.
6 720 802 836-41.1TL
Factory setting
Heating circ.
B Turn the rotary dial until submenu Base point temp. appears.
B Hold down button Display and turn the rotary dial until the required
value is shown.
HEAT CIRC. DATA
Base point temp.
Fig. 28 Setting the low end temperature
B Release Display to save your input.
B Press Back to return to the next higher level.
Input range
Base point temp. 20 °C – 80 °C
Table 40 Setting range Low end temperature

10.4 Setting the design temperature

The design temperature is the flow temperature at the adjusted
minimum outside temperature.
Observe the information regarding setting the heating
curves.
For the heating system Low end the following applies:
• Set the design temperature at least 10 °C higher than the low end
temperature.
• Changing the design temperature allows the heating system to
operate with a flatter or steeper heating curve.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu Heat.circuit + No. is displayed.
B Press Display to call up a submenu.
B Turn the rotary dial until submenu Design temp. appears.
B Hold down button Display and turn the rotary dial until the required
value is shown.
HEAT CIRC. DATA
Design temp.
Fig. 29 Setting the design temperature
B Release Display to save your input.
B Press Back to return to the next higher level.
Heating circuit data | 25
2
o
32 C
6 720 802 836-42.1TL
Factory setting
30 °C
2
o
65
C
6 720 802 836-43.1TL
6 720 802 836 (2012/05)