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a. Normally open contact (W-R) on SPDT relay
closed when thermostat calls for heat.
b. 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 psi.
c. Solenoid valve opens, allowing oil to flow through
nozzle. At the same time, the burner motor's
ignition coil produces spark.
d. Burner motor ignition coil spark ignites oil
droplets.
e. Cad cell senses flame and burner continues to
fire. Ignition transformer ceases sparking.
f.
After fan-limit control bi-metal heats up to the
factory set point, the circulating air blower starts.
g. The circulating air blower and burner motor
remain on until the thermostat is satisfied. Also,
the solenoid valve remains open.
h. Thermostat is satisfied.
i.
Relay contacts open, solenoid valve closes, then
the burner fan motor post-purges the combustion
chamber and vents for pre-set time of 0 to 6
minutes.
j.
During the post-purge cycle, the fan-limit control
bi-metal cools down to the factory set point of 90
degrees Fahrenheit, and the circulating air blower
turns off.
Note:
With burner relay contact open, the Riello 40-
BF will post-purge when 115 volt power is applied to
the burner.
5.3)
Sequence of operation - Beckett
AFG, Riello 40-F:
a. Jumper let contact closed on T-T primary control
terminal of the burner. (Beckett AFG)
b. Normally open contact (W-R) on SPDT relay
closed when thermostat calls for heat.
c. AFG Burner:The motor starts and spark is
established. The pump pressure builds and the
poppet valve opens admitting fuel to the nozzle.
R40-F: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
psi. Solenoid valve opens, allowing oil to flow
through nozzle. At the same time, the burner
motor's ignition coil produces spark.
d. Spark ignites oil droplets.
e. Cad cell senses flame and burner continues to
fire. Ignition transformer ceases sparking (Riello
40-F).
f.
After fan-limit control bi-metal heats up to the
factory set point, the circulating air blower starts.
g. The circulating air blower and burner motor
remain on until the thermostat is satisfied (AFG).
16
The ignition transformer continues to spark (AFG).
The solenoid valve remains open (40-F).
h. Thermostat is satisfied.
i.
SPDT relay contacts open, solenoid valve closes
(40-F), burner fan motor shuts down. The ignition
transformer ceases sparking (AFG).
j.
The fan-limit control bi-metal cools down to the
factory set point of 90 degrees Fahrenheit, and
the circulating air blower turns off.
5.4)
Sequence of operation - DV-2000™
Venting system:
NORMAL OPERATION
a. Before a call for heat the contacts of the pressure
switch are closed.
b. When the room thermostat calls for heat the
normally open contact W-R close and the burner
blower starts and creates a suction in the intake
piping circuit and a pressure in the vent piping
circuit.
c. The differential pressure setting, of the pressure
switch is not exceeded and the thermostat circuit
remains closed until the call for heat has ended.
ABNORMAL OPERATION
START-UP
a. When the room thermostat calls for heat the
normally open contact W-R close and the burner
blower starts and creates a suction in the intake
piping circuit and a pressure in the vent piping
circuit.
b. If there is a blockage in the intake or vent
openings to cause a pressure differential beyond
the set point of the pressure switch, then the
thermostat circuit is opened and the burner will go
into a 30 second post-purge and then shut down.
c. After the post-purge, once the burner blower shuts
down, the pressure switch contacts will re-close. If
the call for heat remains, the burner will re-start. If
the blockage still exists, the thermostat is again
opened, and the burner post- purges again. The
post-purge function thus becomes an inherent
anti-short cycling device.
d. The unit will essentially go into a continuous re-
cycling post-purge mode with no heat being
supplied to the dwelling, which will prompt a call
for service to the equipment.
e. During the re-cycling post-purges, if the blockage
of the terminal is removed, the burner will
immediately fire up at the end of the current post
purge cycle.
DURING OPERATION
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