PV700a / PV1000a pellet burners
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3.4 Oxygen amount sensor
Oxygen amount sensor (oxygen sensor) allows the burner to keep pre-set oxygen level in flue gas, what
increases the efficiency of the burning process. The oxygen sensor is connected to socket X23 as shown
on
Figure
31
.
If the sensor requires heater connection, it can be connected between T6 and B5.
Figure 31 Oxygen sensor connector
Following instruction is applicable for firmware version 2.08.
In order to implement oxygen sensor two parameters PAR66 and PAR67 in parameters menu have to be
set-up:
Table 6 PAR66 and PAR67 set-up
Parameter
Description
Unit
Value
No
Name
Def
Min
Max
PAR66
OXYGEN TYPE
0 – no sensor
1 – 4…20mA = 0…25% oxygen
2 – 4…20mA = 0…20% oxygen
-
0
0
2
PAR67
OXYGEN SET
Oxygen level set-point in flue gas
-
6
4
12
For oxygen amount sensor EP0006 in parameters menu, the PAR66 value has to be set to “1”. Some third
party oxygen amount sensors use 4…20mA output for 0…20% oxygen. In this case, value “2” must be
selected.
If PAR66 is set to “0” (no sensor), secondary fan is driven by air table set in PAR31 – PAR36. Secondary
fan also switches back to air table if oxygen level reading is below 3% or over 19%. Oxygen sensor is
located inside the burning chamber. Oxygen level control starts 5min after burner enters into BURNING
status. It can take about 10min for oxygen level to stabilize.
Oxygen level can be seen in INFO-menu next to pressure reading. The value on the screen must be
divided by 10 to get the real value. For example “O2=113” means oxygen level value 11.3%.
3 2 1
+mA
-mA
PT100 T8
+27.2V T6
GND B5
O
2
X23
JP1
JP2
Heater
-mA/PT100 T7
