Publicité
Les langues disponibles
Les langues disponibles
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 o pen, 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 m otor 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.).
10. 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.
2.3)
Sequence of operation - Beckett A FG and
Riello 40-F, chimney:
1.
For the AFG 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.
AFG Burner: The motor starts and spark is established. The
pump pressure builds and the poppet valve opens admitting fuel
to the nozzle. Pressure builds and poppet valve opens, allowing
oil to flow through nozzle.
40F: 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
16
holding coil pressure will be approximately 100 psig. Solenoid
valve opens, allowing oil to flow through nozzle. At the same
time, the burner motor's ignition coil produces spark.
4.
Spark ignites oil droplets.
5.
Cad cell senses flame and burner continues to fire. Ignition
transformer ceases sparking (Riello R40-F).
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 (AFG). The ignition transformer continues
to spark (AFG). The solenoid valve remains open (R40-F).
8.
Thermostat is satisfied.
9.
SPDT relay contacts open, solenoid valve closes (R40-F), burner
fan motor shuts down. The ignition transformer ceases sparking
(AFG).
10. The fan-limit control BI-metal cools down to the factory set point
of 90 degrees Fahrenheit, and the circulating air blower turns off.
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 close and the burner blower starts and creates
suction in the intake piping circuit and a pressure in the vent
piping circuit.
3.
The differential pressure setpoint of the pressure switch is not
exceeded and the thermostat circuit remains closed until the call
for heat has ended.
Abnormal operation:
Start-up:
1.
When the room thermostat calls for heat the normally open
contact W-R close and the burner blower starts and creates
suction in the intake piping circuit and a pressure in the vent
piping circuit.
2.
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
2 minute post-purge and then shut down.
3.
After the post-purge, once the burner blower shuts down, the
pressure switch contacts w ill 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.
4.
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.
5.
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.
Publicité
