2.4.6
2.4.6
Sequence point 5. Lockout indicator of the control unit is at symbol P
Sequence point 5. Lockout indicator of the control unit is at symbol P
.
Differential air pressure switch has to have changed its contact over to position C/NO.
2.4.7
2.4.7
Sequence point 6. Lockout indicator of the control unit is at symbol
■
Sequence point 6. Lockout indicator of the control unit is at symbol
■
.
Control of flame supervision circuit completed
2.4.8
2.4.8
Sequence point 7. Lockout indicator of the control unit is at symbol
▼
Sequence point 7. Lockout indicator of the control unit is at symbol
▼
.
Pre-purge (22,5 s) completed
.
Servomotor runs to switching point III (ignition load)
.
Sequence switch is stopped during the running time.
2.4.9
2.4.9
Sequence point 8. Servomotor has run to switching point III (ignition load)
Sequence point 8. Servomotor has run to switching point III (ignition load)
.
Required start signal from the limit switch of switching point III to terminal 8 in control
unit. Otherwise the start-up program interrupts and the control unit remains (symbol
▼
) waiting for start signal (no failure).
2.4.10
2.4.10
Sequence point 9. Safety time (5 s) begins
Sequence point 9. Safety time (5 s) begins
.
Contact of return oil pressure switch (max.) must have been closed (C/NC)
.
in control circuit of nozzle valve solenoid valve NC opens and solenoid valve NO
closes
.
Oil pressure is released to control circuit of the nozzle valve. Nozzle valve needle
moves back and opens the nozzle valve.
.
Fuel atomizing from the nozzle begins with pressure set for ignition phase.
.
Oil spraying through the nozzle is ignited by the electric arc
2.4.11
2.4.11
Sequence point 10. Ohjelmareleen ohjelmaosoitin on symbolin 1 kohdalla
Sequence point 10. Ohjelmareleen ohjelmaosoitin on symbolin 1 kohdalla
.
Safety time ends (5s)
.
Flame burns at set ignition load.
2.4.12
2.4.12
Sequence point 11. Lockout indicator of the control unit is at symbol | (operating)
Sequence point 11. Lockout indicator of the control unit is at symbol | (operating)
.
Ignition stops (electric arc)
.
Sequence switch stops for the running time
.
Control signal from terminal 20 on the control unit for the running time
.
Servomotor runs to switching point IV (< V) before switching over to modulating area
(between switching points V and I
.
When the load is high and the burner is turned on all the time, capacity controller
(PID, 3-step control) adjust the burner capacity on the modulating area (I - V) to
correspond to the load. With signal
”
increase
”
or
”
decrease
”
from the capacity
controller or from the control switch in manual operation, the servomotor of air
dampers and oil regulator is regulated to the direction
”
open
”
or
”
closed
”
according to
the capacity demand.
RPMARINES 30820641GB
17 (77)
2. Burner operation
