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1)
SEQUENCE OF OPERATION
1.1)
Sequence of operation - Beckett AFG, Riello
40-F and Aero F-FAC:
1.
Normally open contact (T-T) on primary relay closed when
thermostat calls for heat.
2.
AFG and F-FAC 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
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.
3.
Spark ignites oil droplets.
4.
Cad cell senses flame and burner continues to fire. Ignition
transformer ceases sparking (Riello R40-F).
5.
After fan-limit control heats up to the factory set point, the
circulating air blower and electronic air cleaner starts.
6.
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).
7.
Thermostat is satisfied.
8.
Primary relay contacts open, solenoid valve closes (R40-F),
burner fan motor shuts down. The ignition transformer ceases
sparking (AFG).
9.
The fan-limit control BI-metal cools down to the factory set point
of 90 degrees Fahrenheit, the circulating air blower and the
electronic air cleaner turns off.
2)
CHECKS AND ADJUSTMENTS
2.1)
General:
During initial start-up and subsequent yearly maintenance calls, the
furnace must be thoroughly tested.
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 (see table
# 3.1 to # 3.5), before firing. These are rough
adjustments but they will ensure that the burner will
start and run smoke-free in advance of the fine
adjustments being made.
Open the oil bleed port screw and start the burner. Allow the oil to
flush into a portable container for at least 10 seconds. Slowly close the
PART 2
OPERATION
bleed screw - the oil should flow absolutely free of white streaks or
bubbles to indicate that no air is being drawn into the suction side of
the oil piping and pump. Tighten the bleed screw and the burner will
fire. Adjust the oil pressure as indicated in Table # 3.1 to # 3.5.
2.2)
Restart if Burner Should Stop:
1.
Set thermostat lower than the room temperature.
2.
Press the reset button on the burner primary control (relay).
3.
Set thermostat higher than the room temperature.
4.
If the burner motor does not start or ignition fails, turn off the
disconnect switch and CALL YOUR SERVICEMAN
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.
2.3)
Combustion chamber curing:
Some moisture and binders remain in the ceramic combustion
chambers after fabrication. It is important to clear the chamber of
these residues before testing. If you smoke test before curing, the
instrument may become damaged. To cure the chamber, run the unit
for 3 consecutive cycles, with 3 minutes of elapsed time in between
each cycle. Each burn cycle should be 3 minutes duration. The
exhaust will have a pungent odor and produce a white cloud of steam.
2.4)
Perform the smoke / CO2 test:
1.
Pierce a test hole in the smoke pipe near the furnace breech.
Insert the smoke test instrument probe into the open hole.
2.
Starting with a zero smoke reading, gradually reduce the burner
air setting until just a trace (#1 on Bacharach Scale) of smoke
results.
3.
Take a CO2 sample at the same test location where the smoke
sample was taken. Note the CO2 reading associated with the #1
smoke condition.
4.
Adjust the burner air setting to obtain a CO2 reading 1% lower
than the reading associated with the #1 smoke.
5.
This method of adjusting the CO2 will allow adequate excess air
to ensure that the burner will burn clean for the entire heating
season.
2.5)
Perform the supply air temperature rise test:
1.
Operate the burner for at least 10 minutes.
2.
Measure the temperature of the air in the return air plenum.
3.
Measure the temperature of the air in the largest trunk coming off
the supply air plenum, just "out of the line of sight" of the radiation
coming off the heat exchanger; 12" away from the plenum on the
main take-off usually satisfies this objective.
CAUTION
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