KEY RK-2006LPP, Operation Manual, Page: 7 / 36

7
MINIMUM POWER OPERATION MODE.
When in this mode the controller operates fuel feeding and fan operation to maintain
firing to ensure the minimum fuel consumption. Fuel and air feeding rate is adjusted
by the technician. If in spite of boiler minimum power, increase temperature follows
of water temperature in relation to the top hysteresis parameter setting, the controller
will be switched into EXTINCTION(SHUT DOWN) mode. When the boiler water
temperature drops below the desired setting it will result in switching of the controller
into „max power operation mode”. Pressing STOP button, exceeding time limit for
cleaning, thermostat contacts opening or if water temperature in domestic water tank
is obtained during operation in MINIMUM POWER mode will result in switching of
the controller into EXTINCTION (SHUT DOWN) mode.
SCAVENGE (AIR PURGING).
During operation with minimum power the controller will activate scavenge to ensure
removal of accumulated gases. Scavenge is provided with temporary fan operation.
EXTINCTION (SHUT DOWN).
When in this mode the controller turns off the fuel auger and engages the fan to
ensure complete fuel combustion and the burner cool down. Fan power when in
EXTINCTION (SHUT DOWN) mode is determined by the technician. When
EXTINCTION (SHUT DOWN) is finished the controller is switched into CLEANING,
STAND-BY or STOP mode, provided EXTINCTION (SHUT DOWN) followed as a
result of STOP button pressing.
CLEANING.
Automatic burner cleaning occurs after time set limit by programmer. In this mode
controller starts cleaning system for preset time. After this procedure controller
resets back to STANDBY mode.
AUGER (MANUAL) REFILLING.
User may activate auger manual refilling function. When device is in STOP mode,
press START and hold button for 5 seconds to start refilling. Refilling follows
according to the time programmed by the technician or until it is manually turned off
with STOP button.
AUGER EXTINCTION (EMERGENCY SHUT DOWN).
If the auger is equipped with temperature sensor, a temperature increase above the
range programmed by the technician it will result in activation of auger ignition alarm.
If ignition was detected, the controller turns off the fan and auger. If the burner is
provided with the stoker, the device is switched additionally into AUGER
EXTINCTION (EMERGENCY SHUT DOWN) mode. During shut down the stoker is
engaged for the time needed to remove the fired fuel from the stoker.