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Electronic pellet burner controller – NPBC-V3C-2 / NPBC-V4C-2
thermostat switches back to its normal state, if the temperature of the water in the boiler
meets the required conditions for P1 (or higher power level), specified in the menu Factory
Settings → Power Modulation, the burner starts again.
DHW Priority – the domestic hot water heater (DHW) has higher priority. The pump turns
•
on when all of the following conditions are implemented:
• The temperature of the water in the boiler is higher than 35
• The difference between the boiler's temperature and the water heater's temperature is more
than 5
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• The water heater's temperature is lower than WH set temp.
The circulation pump turns off when the water heater's temperature is equal or higher than WH
set temp. It turns on again when the water heater's temperature gets lower than the difference
between WH set temp and Hysteresis. This work mode assures faster heating for the water
heater by turning off the central heating installation's pump when the water heater's pump is on.
If the central heating installation works with a room thermostat and if it activates, the CH pump
stops. If both installations don't need more heat, the burner switches to Suspend power level. If
any of the installations needs heating, the burner resumes its normal work and switches to the
required power level according to the boiler's temperature. When the time for Suspend power
level is up, the burner turns off, if no heating is required yet. It turns on again when any of the
installations needs to be heated and the conditions for P1 power level set in the menu Factory
Settings → Power Modulation are implemented.
For a normal heat exchange, the boiler's set temperature must be at least 5°C higher than
•
the water heater's set temperature!
If the central heating installation works without a room thermostat its pump works
•
continuously and unconditionally.
Parallel Pumps – both the central heating and the domestic hot water installations work.
•
The burner and the pumps work as in DHW priority. The only difference is that the central
heating circulation pump is allowed to work together with the DHW pump.
Summer Mode – the boiler works only to heat up the water heater. The difference between
•
this mode and DHW Priority is that the boiler turns on only if the water heater needs to be
heated. When the water heater reaches the set temperature (WH set temp) the boiler turns
off. This mode does not control the central heating installation
User Manual / ver3.8
http://www.naturela-bg.com/en/
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