Plum ZAB-14, Service And Assembly Manual

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15.13 Minimum preset boiler
temperature
This parameter can be used to prevent
the user from setting too low preset
boiler temperature. If the boiler operates
at too low temperature, it can cause its
accelerated
degradation, corrosion,
soiling, etc. Algorithms which
automatically decrease temperature will
also not cause decrease in preset boiler
temperature below its minimum value,
specified with this parameter.
Set the value in accordance with
the
boiler manufacturer’s
recommendations.
15.14 Maximum preset boiler
temperature
This parameter can be used to prevent
the user from setting too high preset
boiler temperature.
Algorithms which automatically increase
temperature (correction in accordance
with heating curve or from required HUW
temperature) will also not cause increase
in preset boiler temperature above its
maximum value, specified with this
parameter.
15.15 Minimum fan power
When the regulator is turned on for the
first time, it is necessary to set the user-
defined parameter Minimum fan power.
Service settings > Boiler settings>
Min. airflow output
This parameter prevents the fan against
being damaged due to too low rotary
speed. The minimum fan power should
be determined with some reserve after
observing the fan behaviour.
After setting a value of e.g. 20%, the
user will not be able to set fan speed
lower than 20%.
15.16 Fuel detection time
The regulator can detect lack of fuel in
the main tank of the boiler on the basis
of exhaust gases temperature. If, for a
time exceeding one programmed in
parameter:
Service settings > Boiler settings >
Fuel detection time
, the emission
temperature is lower than one set in
parameter:
Service settings > Boiler settings >
Ex.temp.w.no fuel
,
the regulator will switch from
OPERATION mode into FIRING-UP mode.
If there is no fuel in the bunker, the
firing-up will end with a message of
impossibility to fire the furnace up.
15.17 Maximum feeder temperature
This is the temperature at which the
function which prevents the flame from
going back to the fuel feeder is
activated.
Setting the max. feeder temp. to
„0” allows to disconnect the
feeder sensor and lets the
regulator operate without it.
Nonetheless, such settings are
not recommended, as they will
disable the function of preventing
flame recession.
15.18 Additional feeder operation
time
This parameter defines time for which an
additional (bunker) feeder is activated
after low fuel level is detected by the fuel
level sensor. Additional feeder operation
is described in pt. 8.23.
15.19 Reserve boiler
This parameter defines a temperature of
the biomass boiler at which the reserve
(e.g. gas) boiler is deactivated.
Set the value in accordance
with the boiler manufacturer’s
recommendations