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2.1)
MANUAL OPERATION SWITCHES
FIGURE 3
DNS-0604 Rev.B
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 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 to 20
seconds, establishing the combustion air pattern;
4.
After 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 (30 sec. to 4 min.). 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 closed 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;
16
PART 2
OPERATION
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 the 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 open, solenoid valve closes and the burner fan
motor post-purges the combustion chamber and vent for a pre-
set time of up to 6 minutes (5 inch breach 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 shuts down.
NOTE: With burner relay contact open, the Riello 40-
BF will post-purge when 115 volt power is applied to the
burner.
2.2.3)
Sequence of operation - Beckett AFG and
Riello 40-F - Chimney venting
1.
On the AFG burner, the T-T terminals have to be jumpered on
the primary control of the burner;
2.
Normally open contact (W-R) relay closes when thermostat calls
for heat;
3.
Burner motor starts. The burner motor fan pre-purges the
combustion chamber and vent for 10 to 15 seconds, establishing
the combustion air pattern. After the pre-purge period, the
solenoid valve opens, allowing oil to flow through nozzle. At the
same time, the burner motor ignition coil produces a spark;
4.
Spark ignites oil droplets;
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;
Thermostat is satisfied:
8.
Relay contacts open, solenoid valve closes, burner fan motor
shuts down and the ignition transformer ceases sparking.
2.2.4)
Sequence of operation - DV-2000™
Venting system
Normal operation
1.
Before a call for heat, the contacts of the pressure switch are
closed;
2.
When the room thermostat calls for heat, the normally open
contact W-R closes, the burner blower starts and creates suction
in the intake piping circuit and pressure in the vent piping circuit;
3.
The differential pressure set point of the pressure switch is not
exceeded and the thermostat circuit remains closed until the call
for heat has ended.
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