15
PN 28141 REV. K [10/30/2018]
A.2 Burner Electrodes
Adjustment of electrode tips with respect to each other,
nozzle, burner head is very important to ensure smooth
start-ups and to permit efficient combustion.
Beckett AF and AFII Burners
• Electrode gap: 5/32 inch.
• Distance above horizontal center-line: 5/16 inch.
Older instruction sheets specify 7/16 inch. Current
specification is 5/16 inch.
• Distance ahead of nozzle: 1/16 inch.
• “Z” dimension, distance from front of end cone
(head) to face of nozzle should be 1-1/8 inches. If
ceramic head is used, distance from end cone to
nozzle face is increased to 1-3/8 inches.
Beckett NX Burners
• Electrode gap: 5/32 inch.
• Distance above horizontal center-line: 1/4 inch.
• Distance ahead of nozzle: 3/32 inch.
• Check/adjust zero calibration per Beckett NX Oil
Burner Manual supplied with furnace.
Riello 40F Burners
• Electrode gap: 5/32 inch.
• Distance above horizontal center-line: 13/64 inch.
• Distance ahead of nozzle: 5/64 to 7/64 inch.
A.3 Start Up
Use following instructions to set the burner:
1.
Shut off electrical power to the furnace.
2.
Install oil pressure gauge to pressure port on oil pump.
(Refer to oil pump specification sheet included with
burner instructions).
3.
Restore electrical power to furnace.
4.
Start furnace and bleed all air from fuel oil lines.
5.
Close purge valve and fire the unit.
6.
Allow furnace to warm up to normal operating
temperatures. During this time, set pump pressure in
accordance with data provided in Appendix A, Table A-1
thru A-3.
7.
Chimney vented units
- Drill 1/4" test port in
venting between furnace flue outlet and draft regulator
(barometric damper) to take smoke readings.
8.
Sidewall vented units
- Do not drill. Use test port
in the supplied appliance connector to take smoke
readings.
9.
When furnace has reached "
steady state
" (after
approximately 10 minutes). Set combustion air damper
to get TRACE of smoke for chimney vented units and
ZERO smoke for sidewall vented units.
10.
Check system temperature rise.
Temperature rise is the
difference between return air temperature measured at
a point near return air inlet, and supply air temperature
measured near furnace outlet
.
System temperature rise is listed on furnace rating
plate. If temperature rise is too high, airflow must
be increased. If temperature rise is too low, slow fan
down.
11.
After air adjustments have been completed, recheck
the over fire draft at test port on burner mounting plate
shown in Figure 2. Over fire draft should be adjusted to
-0.02 inches w.c.
12.
Turn burner off. Observe duct thermometer in supply
air stream, note temperature blower fan stops. Fan on
delay and fan off delay adjustments can be made by
moving FAN ON and FAN OFF settings on fan and limit
control or by adjusting dipswitch settings on fan timer
board as applicable.
13.
Check operation of limit switch.
A.
Shut off power to furnace.
B. Temporarily remove neutral wire from blower
motor.
C. Restore electrical power to furnace.
D. Set thermostat above room temperature.
E. After three or four minutes of burner operation,
limit control should turn burner off.
F.
When limit function test is complete, shut off
electrical power to furnace, replace neutral wire to
blower motor. Restore power.
G. Blower fan will start up immediately. Once
temperature has dropped and limit control has
reset, fan will operate until fan off temperature (fan
and limit control) or fan off time delay (fan timer
board) is reached.
H. Oil burner will resume operation and continue until
thermostat is satisfied.
I. Restore thermostat setting to comfortable
temperature.
APPENDIX A - CHECK OUT AND ADJUSTMENTS
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