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Input range
Pump logic
15 °C – 60 °C
temperature
Table 22 Setting range Pump logic temperature
9.1.2 Ecostream boilers
The boiler operating conditions for the Ecostream boilers are set at the
factory and are automatically taken into account. Menu item Ecostream
control via is used to ascertain how the boiler operating temperature
should be controlled.
The factory setting provides a boiler operating temperature of 50 °C. The
minimum set value for the boiler flow temperature is 4 K higher (54 °C).
With the setting Heating circuit actuator the heating circuit circulation
pump starts 5 K below the boiler operating temperature and stops 7 K
below.
Ecostream control via
This setting determines via what servomotor the preset operating flow
temperature should be regulated. The setting must be made in
accordance with the existing or planned hydraulic conditions. It affects
the control of the respective servomotor and the pre-determined set
values.
Select from the following options:
• Heat. circ. act.
must be selected if the Ecostream is to be regulated by superimposed
actuation of the heating circuit actuators (three-way mixing valves).
Heating circuits must be equipped with mixing valves that are
regulated by heating circuit modules of the same CFB series (no third
party-controllers). The control function is designed for an actuator
runtime of 120 s.
• Ext. control
must be selected if the Ecostream is to be regulated by an external
control unit, e.g. if the CFB 840 does not need to fulfil any operating
conditions, for example in dual-block boiler systems with integral
control unit for regulating the annular butterfly valves of the boiler
blocks.
Setting the Ecostream control
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 Ecostream control via 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
Ecostream control via Act. heat.circ..
Ext. Control
Table 23 Setting range Ecostream control
CFB 840
Set the actuator run-time
Factory setting
The actuator runtime is preset and should generally not be changed.
1-stage: 40 °C
2-stage: 45 °C
modulating: 50 °C
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.
B Turn the rotary dial until submenu Actuator runtime appears.
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.
The runtimes of the heating circuit actuators are entered separately
under parameter Heat.circuit. If the runtimes of the individual heating
circuit actuators are different, a representative value (average) must be
entered.
Actuator runtime
Table 24 Setting range Actuator runtime
9.1.3 Condensing boiler
Boiler type Condensing must be selected if a condensing boiler has
been installed. No operating conditions need to be maintained for this
type of boiler.
9.1.4 Low-temperature boilers with base temperature
The respective factory-set operating conditions selected in the control
unit automatically apply when selecting this boiler type. An actuator
regulates the boiler operating temperature in the boiler flow. These set
values always apply, if a load demand exists for the boiler via a
consumer, irrespective of whether the burner is switched on or off. To
support the operating temperature control, the heating circuit
circulation pumps and the boiler circuit pump are switched off, if the
actual temperature falls below the defined minimum temperature.
Setting the fuel type
Set the fuel to be used in this parameter. This setting influences the set
value for the servomotor and burner control. Factory settings default
Gas lower set values for the low end temperature apply when changing
the setting to oil.
Factory setting
B Call up the service level.
Act. circ.act.
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 Fuel appears.
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.
Fuel
Table 25 Setting range Fuel
Incorrect entries may lead to fluctuating flow
temperatures during operation.
GENERAL PARAM. appears as the first main menu.
value is shown.
Input range
10 s – 600 s
The LT/base point temp. must be controlled via the
heating circuit actuators.
GENERAL PARAM. appears as the first main menu.
value is shown.
Input range
Gas
Oil
Boiler parameters | 21
Factory setting
120 s
Factory setting
Gas
6 720 802 836 (2012/05)
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