Operation; Manual Operation Switches; Sequence Of Operation; Thermostat Is Satisfied - ICP OLR105A12D Installation Instructions Manual

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.
2.1

MANUAL OPERATION SWITCHES

FIGURE 3
DNS-0574 Rev. C
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;
16
PART 2

OPERATION

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
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.
chamber and vent for 10 seconds,