Unigas RG91 Manual page 73

10.5 FGR mode choice
1st level 2nd level
Param & Display
Flue Gas
Recirc
Description of the FGR mode.
FGR-Mode
Flue gas recirculation (FGR) function is deactivated.
Aux3onCurve
Auxiliary actuator 3 is driven along its parameterized ratio control curve
After the ignition position, auxiliary actuator 3 is always held at the minimum position for flue gas
recirculation (indicated with #) and the flue gas recirculation temperature is not evaluated (display
XXX).
deactivated This ensures that the system is operated in a safe state if the flue gas recirculation setting could
not be fully realized.
We recommend performing burner start-up using this setting prior to setting the flue gas
recirculation curve
Auxiliary actuator 3 maintains the ignition position until an adjustable time is reached (parameter
"DelaytimeFGR....").
time
During the operation, the burner regulate its load as per the set curve points, without flue gas
recirculation.
Auxiliary actuator 3 maintains the ignition position until an adjustable temperature is reached
(parameter "FRG On Temp ...").
temperature
During the operation, the burner regulate its load as per the set curve points, without flue gas
recirculation.
The position of auxiliary actuator 3 is determined depending on the flue gas temperature and the
ratio control curve.
temp.contr.
In addition, the actuator can maintain the ignition position until an adjustable time (parameter FGR
On Time ...) is reached
Same manner of operation as temp.contr., but the function is automatically deactivated should the
flue gas sensor become faulty.
TCautoDeact
The actuator is driven to the minimum flue gas recirculation (FGR) position and a warning is issued
After the ignition position, auxiliary actuator 3 always maintains the minimum flue gas recirculation
(FGR) position (indicated by #) and the flue gas recirculation (FGR) temperature is not evaluated
(display of XXX).
deactMinpos
The system can thus be driven to a secure state, if it was not possible to fully complete the flue gas
recirculation (FGR) settings.
It is recommended to use this setting for commissioning the burner before adjusting the flue gas
recirculation (FGR) curve
Flue gas recirculation (FGR) with temperature compensation was automatically deactivated. Same
auto deact
operation mode as deactMinpos, but a warning is issued
3rd level 4th level
FGR-Mode AUX3onCurve
time
temperature
temp. contr.
TCautoDeact
deactMinpos
auto deact
Description
5th level 6th level
33
Description
According to the preference and
instruction in the table below.
LMV50
LMV51.3
LMV52.2
●
●
●
LMV52.4..
.
●
●
●
●
●
●
●