8
WARNING
Poisonous carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or
utility room. Return air duct MUST be sealed to
furnace casing.
Failure to properly seal duct can result in death,
personal injury and/or property damage.
WARNING
Poisonous carbon monoxide gas hazard.
Install evaporator coil on the supply side of the
furnace ducting.
An evaporator coil installed in the return side
ducting can cause condensation to form inside the
heat exchanger, resulting in heat exchanger failure.
This could result in death, personal injury and/or
property damage.
PART 2
OPERATION
2.1)
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) 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 valve opens admitting fuel to the
nozzle;
4.
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;
5.
Spark ignites oil droplets;
6.
Cad cell senses flame and burner continues to fire. Ignition
transformer ceases sparking (Riello R40-F);
7.
After Fan-Limit control heats up to the factory set point, the
circulating air blower starts;
8.
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);
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
o
F (32
o
C), and the circulating air blower turns off.
2.2)
CHECKS AND ADJUSTMENTS
2.2.1) 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. On new
installations, set up the burner to the settings shown in
Tables 4.1 to 4.5
,
before firing. These are rough
adjustments but they will ensure that the burner will
start and run smoke-free in advance of fine tuning.
Open the oil bleed port screw and start the burner. Allow the oil to
flush into a container for at least 10 seconds. Slowly close the 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 Tables 4.1 to 4.5.
2.2.2) Restart in case of burner failure
1.
Set the thermostat lower than 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 and 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.
!
!
