User Guide

27
VII: SYSTEM START-UP (continued)
G. START OIL BURNER.
1. Open vent tting on fuel pump.
2. TURN ‘ON’ BURNER service switch and allow
burner to run until oil ows from vent tting in a
SOLID stream without air bubbles for
approximately 10 seconds.
3. Close vent tting and burner ame should start
immediately after prepurge is completed. Prepurge
prevents burner ame until 10 seconds has elapsed
after initial power is applied to burner. During
prepurge the motor and igniter will operate but the
oil valve will remain closed. Refer to Oil Primary
Control Instructions for more details.
4. Adjust oil pressure.
a. When checking a fuel unit’s operating pressure, a
reliable pressure gauge may be installed in either
the bleeder port or the nozzle port. For Beckett
burner refer to Figure 21. For Riello burner refer
to Figure 20.
b. Locate oil pressure adjusting screw and turn
screw to obtain proper pump pressure, refer to
Tables 6 and 7.
c. To check the cutoff pressure, deadhead a reliable
pressure gauge onto the copper connector tube
attached to the nozzle port. Run the burner for a
short period of time. Shut the burner off. The
pressure should drop and hold.
d. Remove the gauge and install bleeder port and/or
reconnect the nozzle port line.
WARNING
DO NOT loosen or remove any oil line ttings
while burner is operating.
H. ADJUST OIL BURNER WHILE OPERATING.
(ame present)
1. SET ROOM THERMOSTAT about 10°F below
room temperature.
2. PRESS RED RESET BUTTON on Oil Primary
Control and release.
3. READJUST THE AIR DAMPER SETTING (air
Band/Air Shutter/Air Gate) on the burner for a light
orange colored ame while the draft over the re is
-0.02”. Use a smoke tester and adjust air for
minimum smoke (not to exceed #1) with a minimum
of excess air. Make nal check using suitable
instrumentation to obtain a CO
2
of 11.5 to 12.5%
with draft of -0.02” (water gauge) in re box. These
settings will assure a safe and efcient operating
condition. If the ame appears stringy instead of a
solid re, try another nozzle of the same type.
Flame should be solid and compact. After all
adjustments are made, recheck for a draft of -0.02”
over the re.
4. ADJUST DRAFT REGULATOR for a draft of
-0.02” (water gauge) over the re after chimney has
reached operating temperature and while burner is
running.
5. Riello Burners - READJUST THE
TURBULATOR SETTING only if necessary, refer
to Table 7.
a. AP-490U through AP-790U (All Models)
Move the setting forward or back one position at
a time to optimize the smoke and CO
2
readings.
See Figure 19.
b. Steps outlined in Paragraph 3 above must be
repeated every time the Head/Turbulator or Air
Damper Setting is readjusted.
6. FLAME FAILURE
The AP-U boiler controls operate the burner
automatically. If for unknown reasons the burner
ceases to re and the reset button on the primary
control has tripped, the burner has experienced
ignition failure. Refer to Oil Primary Control
features, Paragraph J, Step 2 of this section and
Section XI, Troubleshooting, Paragraph B. If the
failure re-occurs, call your heating contractor
immediately before pressing the reset button.
WARNING
DO NOT attempt to start the burner when excess
oil has accumulated, when the boiler is full of
vapor, or when the combustion chamber is very
hot.
Figure 21: Adjusting Fuel Pump Pressure