WARNING
Poisonous carbon monoxide gas hazard.
Install evaporator coil on the supply side of the
furnace ducting.
Evaporator coil installed in return side ducting
can cause condensation to form inside heat
exchanger resulting in heat exchanger failure.
This could result in death, personal injury
and/or property damage.
PART 2
OPERATION
2.1
MANUAL OPERATION SWITCHES
FIGURE 3
2.2 SEQUENCE
OF
OPERATION
2.2.1
Sequence of operation - Beckett AFII
Side-wall venting
1. On the Beckett AFII burner, the T-T terminals have to be
jumpered on the primary control of the burner;
2. Normally open contact (W-R) on SPDT relay closes 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 to 20 seconds, establishing the combustion air
pattern;
4. After the pre-purge 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 remain on until the thermostat is satisfied.
Also, the solenoid valve remains open;
Thermostat is satisfied:
9. SPDT relay contacts open, solenoid valve closes, burner
fan motor post-purges the combustion chamber and vent
for a pre-set time (15 seconds.). The ignition transformer
also continues to spark for this time period;
10. During the post-purge cycle, the Fan-Limit Control cools
down to the factory set point of 32°C (90°F) and the
circulating air blower turns off.
2.2.2 Sequence
of
operation
Riello 40-BF Side-wall Venting
1. Normally open contact (W-R) on SPDT relay closes when
thermostat calls for heat;
2. Burner motor starts. The burner motor fan pre-purges the
combustion chamber and vent for 10 seconds,
establishing the combustion air pattern. During this time
the solenoid valve holding coil pressure will be
approximately 100 psig;
3. After the pre-purge period, the solenoid valve opens,
allowing oil to flow through the nozzle. At the same time,
the burner motor 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;
Thermostat is satisfied:
8. Relay contacts opens, solenoid valve closes, and the
burner fan motor post-purges the combustion chamber
and vent for a pre-set time of up to 15 seconds (5" breech
model only);
9. During the post-purge cycle, the Fan-Limit Control bi-
metal cools down to the factory set point of 32°C (90°F),
and the circulating air blower turns off.
DNS-0574 Rev. C
16
Summary of Contents for NOLF105A12D
Page 25: ...DNS 0571 Rev C DNS 0573 Rev C FIGURE 5 1 Model OLR105A12D FIGURE 5 2 Model OLR160B20C 26...
Page 26: ...FIGURE 5 3 Model OUF105A12C FIGURE 5 4 Model OUF160B18C DNS 0572 Rev D DNS 0568 Rev C 27...
Page 27: ...FIGURE 5 5 Model OLF105A12C DNS 0570 Rev C FIGURE 5 6 Model NOUF105A12D DNS 0674 Rev E 28...
Page 28: ...FIGURE 5 7 Model NOLF105A12D DNS 0676 Rev D 29...
Page 30: ...COMPONENTS AND REPLACEMENT PARTS 31...
Page 31: ...PARTS LIST Model OLR105A12D B50031 B 32...
Page 33: ...PARTS LIST Model OLR160B20C B50032 C 34...
Page 35: ...PARTS LIST Model OUF105A12C B50033 B 36...
Page 37: ...PARTS LIST Model OUF160B18C B50034 D 38...
Page 39: ...PARTS LIST Model OLF105A12C B50035 B 40...
Page 41: ...PARTS LIST Model NOLF105A12D B50037 B 42...