Fulton VMP Webster Oil_Combo Burner - Manual (Page 30)

H. IGNITION SYSTEMS
Page 30 Ignition Systems JB Manual
1. Gas Pilot Assembly
A crucial part of reliable burner operation is a dependable
pilot, which must be properly adjusted and kept clean. A gas
pilot is standard for all models except JB1 through JB2-20
straight oil pressure atomizing burners which have direct
spark ignition as standard. The following illustrations show
the typical configuration and nominal adjustment parame-
ters of each pilot.
Figure H-1 showns the JB1 & JB2 gas pilot. Figure H-2
shows the JB3 gas pilot. Figure H-3 shows how the pilots
are positioned in the burner drawer.
Pilot gas pressure should be measured at the 1/8” port locat-
ed on the downstream side of the last pilot solenoid valve.
2. Oil Nozzle Positiion, Direct Spark Oil.
Figures H-5 and H-6 show the position of direct spark igni-
tion and nozzle positions. These are initial settings and will
be adjusted at start-up.
3. Air Damper Position
On a straight gas burner, the air damper should be open
about 1/4” at low fire and close to full open at high fire. In
Figure H-2 JB3 PILOT ASSEMBLY
Natural Gas Pressure;
4 - 6” wc
LP Gas Pressure;
1.5 - 2.5” wc
some applications, the pilot requires an orifice in the pilot
gas supply line. With the exception of the JB3, this ori-
fice is located external of the blower housing.
The pilot to diffuser dimension is the distance of the face
of the pilot to the outer diameter of the diffuser.
For an oil or combination burner, the air damper should
be open about 3/8” at low fire and close to full open at
high fire.
4. Gas Modualting Control Valve Position
The gas valve should be open about 10% at low fire and
stroked to abput 60% open at high fire.
5. Oil Modulatining Control Valve Position.
For pressure atomizing, the low fire position should be
adjusted to get the correct low fire presure, as stated
on the rating label. Typically, this would be 100 psi for
simplex systems and 65 psi for return flow nozzles. The
high fire position should be about 45o to 60o travel from
low fire.
For air atomizing, the low fire should be on about #2 po-
sition and the high fire should be about the #8 position.
Electrode
Pilot
Electrode Clamp
Figure H-1
JB1 & JB2 Gas Pilot
Spark
Gap = 1/16”
Note: Required 2 1/2” - 3” wc
pressure for natural gas ans 1/2”
- 2” for LP, as measured at the
last solenoid in the pilot train.