Burner Start Up Sequence
Check oil and gas piping (if applicable) for leaks, and
check all controls for compliance with codes and
Check all linkages. If the system is a packaged
burner/heat exchanger system, the linkage was probably
set when the system was fire tested at the heat
exchanger manufacturing factory. It should, however, be
checked to ensure that it was not damaged in shipment.
If the system is a conversion unit (burner and heat
exchanger are mated in the field), the linkage will have to
be set to suit the particular operating conditions.
Do not secure flame safeguard control into its wiring
base until it has been determined that there are no shorts
or grounds in the system.
Install oil pressure and vacuum gauges. See Section 3
for mechanical operation and oil gauge location for the
specific system. Check suction line to be sure manual
valve is open and that check valves are opening in the
proper direction of oil flow. Check oil filter for tightness.
There should be no manual valve in the return line from
pump to tank.
Direct Spark Oil Ignition. Remove oil nozzle gun and
check electrode settings and ensure that oil nozzle size
is correct. Electrode gap should be approximately y,
and set forward to correspond with the nozzle spray
angle. Do not set electrodes so that oil can impinge on
them. See page 32 for detailed information on oil ignition
Gas Pilot Oil Ignition. Remove the pilot assembly and
check for the proper setting of the ignition electrode
spark gap. Install a manometer or 0-10 W.C. gas
pressure gauge in the pilot gas pressure test port. See
pages 34 and 35 for details on gas pilot adjustments.
Disconnect the pilot gas line at the inlet to the pilot gas
pressure regulator and bleed air out of the pilot line.
Make certain that the gas pressure to the pilot regulator
does not exceed the regulator or pilot solenoid valve
rating. When bleeding air from the pilot line system, do
not allow the venting of gas into the room.
Install required systems measuring devices:
appropriate flame signal meter to the flame
stack thermometer, CO2 and Smoke Test sample
line in the breaching
draft gauge to the combustion chamber test point
With the burner panel control switch in the Off position,
apply power to the burner through the main burner
disconnect switch. Switch the burner panel On/Off
switch to the On position momentarily to determine that
the blower motor (and separate oil pump set motor, if
supplied) is running in the right rotation.
Appropriate steps must be taken to transfer the oil from
the tank to the burner. It is imperative that the system be
primed prior to operation. The system priming may be
achieved by closing the manual valve in the oil suction
line and priming the oil pump through the pump gauge
pressure port. Priming can also be accomplished
through the oil filter on the suction line, if it is of the
removable top type. When replacing the oil filter cap, be
sure to attain a vacuum tight seal. Start the burner with
line manual valve closed. Let the burner run until the
vacuum gauge indicates a high vacuum, then quickly
open the manual valve in the suction line. This
combination of priming and high suction should pull the
oil from the tank to the burner, provided that there are no
leaks and the line is properly sized.
Refer to the burner wiring diagram and flame safeguard
control information supplied with the burner to determine
the specific firing sequence relating to limit and interlock
Set the air damper approximately ¼ open and start the
burner. The ignition circuit will be energized after the
blower prepurge period (if supplied) has been completed
and all limit and other interlock circuits have been closed.
If the unit has a gas pilot, allow it to come on and adjust it
for proper ignition and flame signal. For flame safeguard
controls having a timer Stop/Run test switch, place the
switch in the Stop position, causing the ignition timing
sequence to stop while air and gas pressure adjustments
are being made. See pages 34 and 35 for details on gas
pilot ignition adjustments. Cycle the burner several times
to make certain the pilot is operating reliably. Shut the
pilot gas cock and cycle the burner through prepurge.
With the gas shut off, the pilot valve and ignition
transformer will energize, but there will be no pilot and
the unit will shut down on safety lockout. There should
be no evidence of a flame signal reading, nor should the
main oil solenoid valve attempt to open.
When a Gas Pilot is used to ignite the main oil, there will
be a period of time when only the pilot will be on. The
flame scanner must first detect the pilot and then, in a
given number of seconds, the main oil solenoid valve will
be energized. For direct spark ignited oil units, the
ignition spark and main oil solenoid valve will be
energized at the same time. As soon as the oil flame is
detected by the flame scanner, the ignition spark will be
de-energized (interrupted ignition), unless the burner is
equipped with intermittent spark operation, which keeps
the spark on during the burning cycle.
If the burner is direct spark ignited, either remove the
flame scanner from its sight pipe or electrically
disconnect the main oil solenoid valve and start the
burner. In either of the above tests, the flame safeguard
control will not detect any flame and should go into a
safety lockout mode requiring manual reset of the flame
safeguard safety lockout switch.
There must be no indication of oil pressure at the nozzle
until the main oil valve is programmed to open. Should a
pressure reading be obtained prior to that time, it is an
indication that the main oil valve has been mis-wired or is
Restart the burner and allow normal sequencing to bring
on gas pilot ignition or the direct spark ignition. Once the
main solenoid oil valve is energized, the oil flame should
be established immediately. If not, shut the system down
and make corrections as required. Do not repeatedly
recycle the burner, such as to allow any accumulation of
unburned fuel in the combustion chamber.
(page 3 - 979)