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Automatic work mode ( Auto ):
By selecting this mode, a choice for the external installation, which is going to be heated by the boiler,
appears:
Work modes with external installations:
CH Priority – only the building heating installation works. The circulation pump turns on
•
when the temperature of the water in the boiler gets higher than the set temperature in the menu
CH Setup. The pump works until the temperature of the water gets lower than the set
temperature. When the room thermostat activates due to reaching the set temperature, the pump
keeps working, but the burner's power starts to decrease with one power level down on time
intervals set from the menu Burning Shutdown. At the end it goes through Suspend mode too
before it turns off. If the room thermostat goes back to its normal condition before the burner is
off, it will continue its work according to the temperature of the water in the boiler. If the room
thermostat is active for longer period (the time for Burning Shutdown + Suspend time has run
out) the burner turns off and will be ignited again after the thermostat gets back to its normal
condition.
DHW Priority – the domestic hot water heater (DHW) has a priority in heating. The pump of
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the water heater's installation turns on when all of the following conditions are implemented:
The temperature of the water in the boiler is above 35
•
The difference between the temperature of the water in the boiler and in the water heater
•
is above 5
The temperature of the water in the water heater is lower than the temperature set in the
•
menu DHW Setup, line Set Temp.
After reaching the set temperature, the circulation pump turns off and then turns back on again
when the temperature of the water in the water heater gets lower than the difference Set Temp
– Hysteresis in the menu DHW Setup. When the water heater reaches the set temperature, if
the room thermostat is activated from the menu Addons Acctivation, the central heating
installation's pump turns on. In this case, if the room thermostat activates because of reaching
the set temperature and if the temperature of the water in the water heater is higher than Set
Temp – Hysteresis, the burner switches to Suspend mode. After the set time for Suspend
mode runs out, the burner turns off. It turns on again when the temperature of the water in the
boiler gets lower than the set temperature minus the temperature difference set for the second
power level in the menu Burn Level. The conditions for the circulation pumps of the water
heater or the heating installation should be implemented, as well.
For a normal heat exchange, the set temperature of the boiler must be at least 5
•
degrees higher than the set temperature of the water heater!
If the room thermostat is not activated in the menu Addons Activation, the temperature
•
in the rooms is considered as not reached and the central heating circulation pump
User Manual / version 2.6
Electronic pellet burner controller - NPBC-V3M
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http://www.naturela-bg.com/en/
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page 7 of 27
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