Plum ecoMAX920P1-S TOUCH, Installation And Operating Manual, Page: 12 / 48

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 in Fuzzy Logic regulation mode – after
exceeding boiler preset temperature by
5ºC.
In SUPERVISION mode the controller
oversees the furnace, keeping it from
burning off. To do so, the burner operates
with very low power, what together with
properly adjusted parameters do not cause
further increase in temperature. Burner’s
power in SUPERVISION mode and other
parameters of Supervision are grouped in the
menu:
Service settings
→
Burner settings
→
Supervision
Mode parameters must be set according to
recommendations
of boiler/burner
manufacturer. They should be selected in
such a way that the furnace did not damp
out during boiler pauses (it should not be
fired up too much simultaneously as it will
cause boiler temperature to increase).
The parameters in this mode must
be so chosen as to make the boiler
temperature gradually decreasing.
Incorrect settings can cause boiler
overheating.
Maximum time of boiler’s operating in
supervision mode is defined in service
parameter Supervision time. If after this time
(in Supervision mode) there is no need to
restart the boiler then the controller starts
the process of boiler’s burning off.
For setting Supervision time = 0 the
controller omits SUPERVISION mode
and goes directly to BURNING OFF.
8.9 BURNING OUT/BURNING OFF
mode
In BURNING OUT mode the remaining fuel
burns out and the boiler is prepared for
burning off and next to enter STOP or
CLEANING mode. All parameters affecting
the burning out/burning off process are
grouped in the menu:
Service
settings
→
Burner settings
→
Burning out/Burning
off
The controller stops feeding the fuel and
performs cyclic blowing according to Blowing
time and Blowing pause settings in order to
burn the remaining fuel. After flame
brightness dropping below Burning out end
threshold value it enters into Burning off
mode where after expiry of Burning off time
the controller will shut down the boiler but
still control the CH and HUW pumps.
8.10 STOP mode
In the STOP mode the boiler is being burnt
off and awaits the signal to start operation.
The following can be a signal to start
operation:
 decrease of preset boiler temperature
below preset temperature diminished by
boiler hysteresis (Boiler hysteresis),
 by boiler operation configuration with the
buffer decrease of top buffer temperature
below preset value (Buffer loading start
temperature).
8.11 GRATE mode/CLEANING
Some boilers have an additional grate to
burn other fuels such as wood waste, etc. To
activate the grate, move the parameters
available in the menu:
Boiler settings
→
Operation mode from
"pellet" to "grate".
In the grate mode fuel feeder is turned off.
The combustion process is regulated by the
fan. Fan power, when working with grate, is
set in the parameters: Fan in grate mode,
Fan output in grate mode and Blowing power
– supervision, Blowing pause - maintaining.
The parameters affecting the grate operation
are set in the menu:
Boiler settings
→
Output modulation
and
Service settings
→
Burner settings
→
Cleaning
Service settings
→
Burner settings
→
Grate
The values of parameters such as:
Boiler settings
→
CH preset temperature
- grate
Service settings
→
Boiler settings
→
Boiler hysteresis - grate
are individually adjusted for the "grate". This
allows to define different properties of boiler
operation for operation modes "grate" and
"pellets". When using the grate an alarm "No
fuel" can appear. This alarm occurs when a