© KWB – Kraft und Wärme aus Biomasse GmbH MA Multifire 08/2008 Page 73
4 Operation, specialist
Request The boiler maintains the boiler temperature only at the request of a heat consumer. Other than in
special cases this setting should always be selected.
Time program: At the specified times the boiler always maintains its boiler temperature. In the interim it is only
activated on request from a heat consumer.
Continuous operation: The boiler always maintains its boiler temperature.
Slave boiler: The auxiliary boiler is always the slave boiler.
Alternating operation: The role of master boiler is swapped between the two boilers in an adjustable rhythm.
The rhythm can be set under the boiler program – sequence times.
Double operation: Both systems run in parallel operation in response to a request.
4.2 Menu item – Basic Settings
4.2.1 Boiler temperature
Actual temp.: Actual temperature of the boiler water
Target temp. 1: Target temperature of the boiler water at normal operation.
Target temp. 2: Target temperature of the boiler water on request via the “External 2” input
(External 2 – mode must be set to “Heat to target 2”, see point 4.2.10.1.1).
Ext. target temp.: External target temperature of the boiler water
Ext. target temp.: Status display on/off
Function: Status display on/off
Strength of the analogue signal: 4 to 20 mA or 0 to 20 mA
Range: Control unit range 50 – 90 °C
Analogue input: Momentary value
Ext. target temp.: Actual value
The control unit has an automatic setpoint calculation feature. The value set for “Target” (1
st
or 2
nd
setpoint) is the
minimum setpoint (setting range 65 to 90 °C) of the boiler water temperature. If the value determined from the highest
requested consumer forward flow temperature is +3 °C greater, it is specified as the calculated setpoint. In this manner
the setpoint can glide between the set minimum value and max. 90 °C. In the example above “Target 1” can glide
between 70 and 90 °C, and “Target 2” can glide between 80 and 90 °C depending on the consumer request. If there is no
specification from the consumers (e.g. without heating circuit module) then the system is regulated to the set minimum
setpoint.
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