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) 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 (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;
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.
Abnormal operation
Start-up
1. 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;
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 15 seconds post-purge and then
shut down;
3. Once the burner blower shuts down, after the post-purge,
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;
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 service call;
5. If, during the re-cycling/post-purges, the blockage of the
terminal is removed, the burner will immediately fire up at
the end of the current post-purge cycle.
During operation
If the terminal vent or intake openings become blocked to the
point where the set point of the pressure switch is exceeded
during a firing cycle, the flame will shut down and the burner
will go into the indefinite recycling post-purge mode as
described above, until the blockage is removed.
2.3
CHECKS AND ADJUSTMENTS
2.3.1 General
During initial start-up and subsequent yearly maintenance
calls, the furnace must be thoroughly tested.
Open the oil bleed port screw and start the burner. Allow the
oil to drain into a container for at least 10 seconds. The oil
should flow absolutely free of white streaks or air bubbles to
indicate that no air is being drawn into the suction side of the
oil piping and pump. Then slowly close and tighten the bleed
screw. Fire the burner. Adjust the oil pressure as indicated in
Tables 4.1 to 4.3.
IMPORTANT
The burner must be put in operation for at least 10
minutes before any test readings are taken. For new
installations, set up the burner to the settings in Tables
4.1 to 4.3
before firing. These are rough adjustments
but they will ensure that the burner will start and run
smoke-free in advance of the final adjustments to be
made.
2.3.2
Restart after burner failure
1.
Set thermostat lower than the room temperature;
2.
Press the reset button on the burner primary control (relay);
3.
With side-wall venting and Riello burner, set thermostat higher
than the room temperature for 10 seconds, then set lower than
room temperature. This will start pre-purge cycle. Repeat twice;
4.
Set thermostat higher than the room temperature;
5.
If the burner motor does not start or ignition fails, turn off the
disconnect switch and CALL A QUALIFIED SERVICE
TECHNICIAN.
CAUTION
Do not attempt to start the burner when excess oil has
accumulated, when the furnace is full of vapour, or
when the combustion chamber is very hot. Always keep
the supply valve closed if the burner is shut down for an
extended period of time.
17
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...
