19
PART 2
OPERATION
1)
MANUAL OPERATION SWITCHES
FIGURE # 3
2)
SEQUENCE OF OPERATION
2.1)
Sequence of operation - Beckett
AFII, Side-wall venting:
1. For the Beckett AFII burner, the T-T terminal have
to be jumped on the primary control of the burner.
2. Normally open contact (W-R) on SPDT relay closed
when thermostat calls for heat.
3. Burner motor starts and spark is established. The
burner motor fan pre-purges the combustion
chamber and vent for 15 or 20 seconds,
establishing the combustion air pattern.
4. After prepurge period, solenoid valve opens
allowing oil to flow through nozzle.
5. The ignition transformer spark ignites oil spray.
6. Cad cell senses flame and burner continues to fire.
7. After fan-limit control heats up to the factory set
point, the circulating air blower starts.
8. The circulating air blower, burner motor and ignition
transformer remains on until the thermostat is
satisfied. Also, the solenoid valve remains open.
9. Thermostat is satisfied.
10. SPDT relay contacts open, solenoid valve closes,
burner fan motor post-purges the combustion
chamber and vent for a pre-set time (30 sec. to 4
min.). The ignition transformer also continues to
spark for this time period.
11. During the post-purge cycle, the fan-limit control
cools down to the factory set point of 90 degrees
Fahrenheit, and the circulating air blower turns off.
2.2)
Sequence of operation - Riello 40-
BF, Side-wall Venting:
1. Normally open contact (W-R) on SPDT relay closed
when thermostat calls for heat.
2. Burner motor starts. The burner motor fan pre-
purges the combustion chamber and vents for 10
seconds, establishing the combustion air pattern.
During this time the solenoid valve holding coil
pressure will be approximately 100 psig.
3. After prepurge period, solenoid valve opens,
allowing oil to flow through nozzle. At the same
time, the burner motor’s ignition coil produces
spark.
4. The ignition transformer spark ignites oil spray.
5. Cad cell senses flame and burner continues to fire.
Ignition transformer ceases sparking.
6. After fan-limit control heats up to the factory set
point, the circulating air blower starts.
7. The circulating air blower and burner motor remain
on until the thermostat is satisfied. Also, the
solenoid valve remains open.
8. Thermostat is satisfied.
9. Relay contacts open, solenoid valve closes, and
then the burner fan motor post-purges the
combustion chamber and vent for a pre-set time (5”
breech model only) (0 min. to 6 min.).
Main power ON-
OFF switch
DNS-0574 Rev. B
Constant blower
operation switch
(low speed)
Содержание OLR Series
Страница 29: ...DNS 0571 Rev B DNS 0573 Rev B 30 FIGURE 5 1 Model OLR105A12B FIGURE 5 2 Model OLR160B20B...
Страница 30: ...31 FIGURE 5 3 Model OUF105A12B FIGURE 5 4 Model OUF160B18 DNS 0568 Rev C DNS 0572 Rev C...
Страница 31: ...FIGURE 5 5 Model OLF105A12B DNS 0570 Rev B FIGURE 5 6 Model NOUF105A12B 32 DNS 0674 Rev C...
Страница 32: ...33 FIGURE 5 7 Model NOUF160B18B FIGURE 5 8 Model NOLF105A12B DNS 0676 Rev C DNS 0675 Rev D...
