PV700a / PV1000a pellet burners
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DK9401B1 www.pelltech.eu
3.3 Flue gas fan
The burner needs stable under-pressure in burning chamber for its correct operation. Simplest way to
assure this is to use the flue gas fan between boiler and chimney. With flue gas fan the burner can
control and hold constant under-pressure. In order to control flue gas the PAR60 value has to be set
to”2” ON. Selected flue gas fan must provide transmission of the maximum flue gas amount and exceed
the pressure provided by boiler, ash cyclone and chimney. The flue gas capacity for burned pellets can be
calculated by simplified formula.
V – Capacity range in m³/h
P – Burner max power in kW
T
fg
– Flue gas absolute temperature in K
T
room
- Room absolute temperature in K
λ (lambda) – Excess air ratio
PV burners are designed to work at lambda values 1.2...1,5 - for calculations choose value of 1,5.
Flue gas fan must be installed between boiler and chimney. If ash cyclone is used then flue gas fan must
be installed between ash cyclone and chimney to avoid overpressure in cyclone and smoke leakage.
Burner setup
Depending on burner’s configuration (weather inverter included or not) the electrical connections may
be different. In case the frequency inverter has already been installed in factory to the burner, the flue
gas fan can be directly connected to the burner through connector Y8. Fan must be connected to burner
with 3-wire cable (3x1,5mm²). Internal inverter output is 3 x 230V. If flue gas fan motor is a three phase
motor (3 x 230/380V) then it has to be connected as triangle.
In case the burner has no inverter, the external inverter for flue gas fan can be used.
Inverter must be selected according to fan motor’s parameters and available power supply. The inverter
must be switched to sink logic (negative common).
To connect the external inverter with burner there is connector Y7 with 3 output signals:
•
T1 - burner DC common (ground), must be connected with external inverter input common.
•
S3 – inverters “run” command, must be connected with F (forward) pin on inverter input. Burner
will connect this pin to ground when fan must run.
•
B4 – 0… 10V output for fan speed, must be connected with inverter analogue input.
Inverter setup
Inverter parameters are set up at factory for automatic control. To test flue gas fan manually:
1.
Press Easy button on inverter
2.
Press Dial button and change settings :
CN0d – “0” FN0D – “0” F174 – “0”
