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Flex Fuel Owner’s Manual
March 2011
Depending on the installed options, up to three furnace operating modes are available:
• Bulk materials
The furnace is operated using bulk material fuel. This must be manually ignited.
• Bulk materials auto control
The furnace is operated using bulk material fuel. This is automatically ignited by the igniter.
• Pellets auto control
The furnace is operated using pellets for fuel. This is automatically ignited and automatically fed.
Note: Always ensure that the insert corresponding to the furnace operating mode is fitted
in the firebox.
10.3 Changing the Furnace Operating Mode
You have verified that the correct insert for the required furnace operating mode is fitted in the
firebox and want to switch to another furnace operating mode. First check the current operating status
of your furnace since it is not always possible to change the operating mode (bulk material
combustion is in progress and you want to change to operating mode “Pellets auto control”). In this case,
changeover is not possible and the following message is shown on the display for several seconds:
Changeover in status “bulk materials!” not possible!
The following table summarizes the operational states which permit a change of furnace operating
mode:
10: Operating Modes
Possible Operating Status
Change-over possible for any operational status!
“Heat exchanger cleaning waiting
to be released!“
“Availability!”
Change-over possible for any operational status!
Change-over
from
Pellets - auto
control to
Bulk materials
Bulk materials
to Pellets - auto
control
“Furnace is
switched off!”
“Furnace is
switched off!”
“Furnace is
switched off!”
“Furnace is
switched off!”
“Stop system!”
“Stop system!”
“Stop system!”
“Heat exchanger cleaning is
active!”
“Heat exchanger cleaning waiting
to be released!“
“Heat exchanger cleaning is
active!”
Pellets - auto
control to
Bulk materials
auto control
Bulk materials
auto control
to Pellets - auto
control
“Heat exchanger cleaning is
active!”
“Heat exchanger cleaning waiting
to be released!“
“Heat exchanger cleaning is
active!”
“Heat exchanger cleaning waiting
to be released!“
Bulk materials to
Bulk materials
auto control
Bulk materials
auto control to
Bulk materials