Basic Operating Modes - Opop Biopel MINI Installation And Operation Instructions Manual

7.2.

Basic operating modes

Biopel goes through several operating modes during its operation, which are displayed on the Main Panel. You can find
more information regarding each operation mode down below, included associated messages.
Ignition: automatic ignition of pellets on the grate. Maximum time set at 12min. During this time, the boiler will go through
several operating stages:
 Pre-ventilation – grate cleaning by fan, factory setting (FS) = 30s.
 Sub-base time - pellet dosing by feeder, the internal feeder in the burner works twice as long to move all the pellets
to the burner grate. FS = 12 - 15s
 Fan delay - preheating igniter before starting the fan. FS = 30s
 Fan speed 1 - fan speed during the first 6 min of ignition. Fan operates at low speed to produce a flame without
cooling the ignitor. FS: 3-8%
 Fan speed 2 - fan speed during the second 6 min of ignition. Maximum ignition cycle is 12min. If the pellets do not
ignite during the first 6min, the fan will increase its speed to create a flame. The standard ignition time is 3-6min.
FS: 5-16%
 Ignition delay - flame has been created, photosensor detects light, followed by flame stabilisation. If the flame
detection by the photosensor is stable, the boiler goes into PID work (normal operation). If the flame detection by
the photosensor is not stable, the boiler remains in the Ignition phase until the flame is large enough. If the flame
is extinguished, a second Ignition follows (maximum for another 12min).
 The output of the Ignition phase can be:
o Transition to PID work - normal boiler operation, or
o Alarm message - Ignition error, pellets failed to ignite for some reason. The boiler tries Ignition twice before
the announcement of this error condition appears. For more information, see Operating and Error messages
chapter.
PID mode: normal boiler operation, indicated by the current boiler power and fan speed in %, which correspond to the
percentage of the current power. The following operational states occur in PID mode:
 Min. power – the boiler starts its operation in the lower half of the power spectrum, i.e., 0-50% of the maximum
power. The reason for this is to ensure that the small flame is not smothered by a large amount of pellets after
ignition. FS = 1-50% of maximum output, depending on boiler type.
 Max. output – the boiler gradually increases its output up to the maximum, i.e., 100%. This can take 5 to 15
minutes, depending on boiler type. The modulation is then influenced by the set and measured CH temperature.
 PID modulation - As the boiler approaches the set CH temperature, it begins to modulate output to keep the set
temperature within the limit given by the factory setting in the Service Menu. Boiler set temperature can be
exceeded by 5°C. This is also the modulation range within which the boiler attempts to maintain the CH
temperature so that it does not have to enter into the Extinguish phase if the set temperature is exceeded by 5°C
or more.
 The output of the ignition phase can be:
o Transition to Extinction - Set temperature exceeded by 5°C.
o Continuous PID mode - the set CH temperature is not exceeded by 5°C due to downward power modulation.
The boiler remains in PID mode and maintains the CH temperature at the set value due to up and down
power modulation.
o Switched off by thermostat - the room thermostat forces the transition from PID mode to Extinction as the
room temperature has been reached.
Extinction: phase that the boiler reaches when warmed to the set CH temperature + 5°C, as the room thermostat does
not instruct on heating. Boiler goes through the following operating stages in the Extinction phase:
 Cleaning - first phase of extinction. Photosensor still detects flame in the boiler, so the boiler tries to burn it out by
deactivating the external feeder and increasing the fan speed to 70%. This continues for a set time or until there
is no more flame in the boiler.
 Cooling - After all the remaining pellets on the grate have burned out, the photosensor no longer detects the light,
so the boiler goes into the second phase of extinction, which is cooling. Fan speed is 100%. The grate is cooled by
the fan to prevent its deformation.
The grate can only deform without fresh air supply, so the fan cools it. FS = 5-15min depending on the boiler type.
When the extinction is finished, the unit shows "Stand by" message. This is a standby mode where
the boiler waits for conditions to reactivate the Ignition phase. This situation occurs when the
measured CH temperature drops by 15°C or when the room thermostat instructs the heating.
Biopel MINI - Installation and Operation Instructions
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