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22 | Boiler parameters
9.2
Setting the burner type
Additional setting masks will be displayed subject to the selected burner
type.
Select from the following options:
• Single stage
• two-stage
• Modulating
• 2 x Single-stage
This setting must be used in the following cases:
– For a boiler sequence comprising two single stage boilers that are
operated with only one CFB 840 on the 1st boiler and a constant
control unit on the 2nd boiler.
– For certain dual block boilers, each equipped with two single stage
burners, which operate independently of each other.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu Boiler param. appears.
B Press Display to call up a submenu.
B Turn the rotary dial until submenu Type of burner appears.
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
Type of burner
single-stage
two-stage
modulating
2 x single-stage
Table 26 Setting range Burner type
9.2.1 Modulating burner
Minimum modulation output Setting
The Minimum modulation output is that part of the total output, down
to which the burner can be modulated. The burner will be completely
switched off if the demand falls below this set value. Incorrect settings
can lead to control fluctuations.
B Call up the service level.
GENERAL PARAM. appears as the first main menu.
B Turn the rotary dial until main menu Boiler param. appears.
B Press Display to call up a submenu.
B Turn the rotary dial until submenu Minimum Modulation appears.
B Hold down button Display and turn the rotary dial until the required
value is shown.
B Release Display to save your input.
Input range
Minimum Modulation 10%...60%
Table 27 Setting range Minimum modulation
6 720 802 836 (2012/05)
Burner set motor runtime setting
The setting Burner set motor runtime tells the control unit the time
required by the burner servomotor for the movement between "closed"
and "open".
B Turn the rotary dial until submenu Burner sett. motor runtime
B Hold down button Display and turn the rotary dial until the required
B Release Display to save your input.
B Press Back to return to the next higher level.
Burner sett.
motor runtime
Table 28 Setting range Burner set motor runtime
9.2.2 2 x single stage burner
Lead-lag acc. to ... Set Hours
This options allow the selection of the number of hours after which the
sequence with the 2 x single stage boiler blocks is reversed.
B Call up the service level.
B Turn the rotary dial until main menu Boiler param. appears.
B Press Display to call up a submenu.
Factory setting
B Turn the rotary dial until submenu Lead-Lag acc. to appears.
Single stage
B Hold down button Display and turn the rotary dial until the required
B Release Display to save your input.
Lead-lag acc. to ...
Hours
Table 29 Setting range Lead-lag/rotat after ... hours
Load limit
If burner type 2 x single-stage is selected, an outside temperature can
be specified under parameter Load limit, from which stage 2 will be
automatically blocked.
Example: From a certain outside temperature upwards, operation will
be limited to one boiler stage or one boiler block.
B Turn the rotary dial until submenu Load limit from outside T.
B Hold down button Display and turn the rotary dial until the required
B Release Display to save your input.
B Press Back to return to the next higher level.
Factory setting
30%
Load limit
from outside T.
Table 30 Setting range Load limit from outside temperature
appears.
value is shown.
Input range
5 s – 60 s
GENERAL PARAM. appears as the first main menu.
value is shown.
Input range
00, 10, 20, ... 1000
hours
appears.
value is shown.
Input range
–31 °C – 30 °C
none
Factory setting
12 s
Factory setting
00 hours
Factory setting
17 °C
CFB 840
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