If the boiler temperature or pressure exceeds the set value of control device of stage 2,
burner remains operating at stage 1.
If the boiler temperature or pressure is below the set value of control device of stage 2,
the air quantity increases and solenoid valve for stage 2 opens. Oil is delivered to the
nozzle of stage 2. The air dampers turn to the position of stage 2. Burner operates at
stage 2.
If the boiler temperature or pressure is below the set value of control device of stage 3,
the air quantity increases and solenoid valve for stage 3 opens. Oil is delivered to the
nozzle of stage 3. The air dampers turn to the position of stage 3. Burner operates at
stage 3.
When the boiler temperature or pressure exceeds the set value of control device of stage
3 burner runs to stage 2 or 1.
When the boiler temperature or pressure exceeds the set value of control device of stage
1, burner shuts down (air dampers close).
2.1.4
2.1.4
PI-diagram of a 3-stage ( T )burner
PI-diagram of a 3-stage ( T )burner
1.
Oil pump, By-pass plug removed
2.
Pressure gauge
3.
Pressure switch
4.
Closing valve, closed by default
5.
Three-way valve
6.
Main solenoid valves, closed by default
7.
Limit thermostat preheater
8.
Temperature sensor
9.
Temperature indicator and controller
10. Temperature indicator
11. Flame detector
12. Solenoid valve, stage 1, open by default
13. Non-return valve
14. Servo motor
PS
TI
TZA
TI C
TE
M
PS
PI
RE
RE
*
*
*
*
1
2
3
4
5
6
6
3
7
8
9
10
11 11
A
B
12
13
15
16
14
17
RPMARINES 30840641GB
11 (57)
2. Burner operation