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9.3
General settings regarding boiler parameters
9.3.1 Set up the pump function
The pump function can only be set when no heating
circuit 0 was chosen.
Subject to the hydraulic system or the operating conditions of certain
boilers, the boiler pumps will be utilised as feed, bypass or test point
pumps.
The following pump functions can be selected:
Pump function
Explanation
Boiler pump
The control logic and the boiler circuit pump
characteristics depend on the selected boiler
type, i.e. the possible boiler operating conditions
affect the boiler circulation pump control. In
exceptional cases the run-on time of the boiler
pump can be altered.
Sensor pump
This pump is primarily used to flood the boiler
sensor in dual-boiler systems. The test point
pump always operates in parallel with the
operation of burner stage 1. The control of the
pump depends on the boiler type selected.
If you make this selection, the boiler or the test
point pump will not be subject to any boiler
operating conditions.
The operating conditions for the boiler according
to Code of Practice K6 must be fulfilled.
None
–
Table 31 Pump function
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 Pump function 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.
9.3.2 Setting boiler pump run-on time
In order to maximise the use of the heat stored in the boiler, a time must
be specified for which the pump should continue to operate after the
burner has been shut down,
Change the factory-set value of 60 min. only in exceptional cases.
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 Boiler pump overrun time
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.
CFB 840
Input range
Boiler pump function Boiler pump
Test point pump
none
Boiler pump
0 min – 60 min
overrun time
Constant operation
Table 32 Setting range Boiler pump run-on time
9.3.3 Setting the minimum burner runtime
This option determines the minimum burner runtime after a burner start.
The minimum burner operating time tells the system, for how long the
burner continues to operate after the burner has been switched on,
irrespective of the actual set value. This prevents the burner being
frequently cycled on and off under certain system conditions.
Change the factory setting only in exceptional cases.
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 burner runtime
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
Minimum burner
0 s – 300 s
runtime
Table 33 Setting range Minimum burner runtime
9.3.4 Selecting the minimum start temperature
This setting determines the minimum limit for the cut-in temperature at
which the burner starts.
The burner will be switched ON again no later than when the boiler flow
temperature falls to the minimum start temperature when there is heat
demand.
Modify the minimum start temperature only if necessary.
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 on Switch temp.
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
Minimum start
5 °C – 65 °C
Switch temp.
Table 34 Setting range Minimum start temperature
Boiler parameters | 23
Factory setting
none
60 min
Factory setting
120 s
Factory setting
5 °C
6 720 802 836 (2012/05)
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