Weil-McLain VHE 4 - Table V: Spark Present, Pilot Will Not Light

HE (Series 2) and VHE (Series 2) with Whit e-Rodgers Cycle-Pilot* for Natural Gas Firing
TABLE V—SPARK IS PRESENT—PILOT WILL NOT LIGHT
Make sura all gas cocks and gas shut-off
valve# are open, la the gas cock knop on
the 36C84 valve in the "on" position?
(Figure 6)
Is incoming pressure at least 5.0'?
Move gas cock knob to the “ON” position.
(Figure 6)
Is 3098 Mercury Flame Sensor plugged
into gas valve? (Figure 11)
If alt gas cocks are open, contact the gas
supplier. The 36C84 series valve requires a
minimum of 5.0" W.C. inlet. (Figure 7)
Place a steel rule or small screwdriver
blade across the top of the pilot solenoid
coil. Is a magnetic pull felt? (Figure 9)
Firmly seat 3098 Flame Sensor into gas
valve socket. (Figures 10-11)
Is gas present at the pilot burner? (Use a
match taped to a long screwdriver or a pilot
lighter to manually light pilot) (Figure 8)
Is 24 VAC across terminals C and L on
36C84 gas valve? (Figure 7)
Check wiring to gas valve.
Check for ignition sparks between the
electrode tip and the sensing bulb. Does
spark occur in the middle of the pilot gas
stream.
Check for blocked pilot orifice or tubing.
(Figure 8). If orifice and tubing are dear,
replace gas valve. (Figure 7)
Check for physical damage to the pilot
bumers/electrode or debris near electrode.
With a manually lit pilot flame, check the
position of the tip of the ignition electrode.
The tip should be in the soft blue portion of
the pilot flame so that a spark to the pilot
head will ignite pilot gas. On an ignition trial
does the gas sputter past the spark? (See
Figure 8)
Remove the flame sensor from valve socket, and
place a jumper wire between holes 3 and 4 on
the gas.valve. With jumper in place, check for
magnetic field on top of solenoid coil. If
magnetic pull is not felt, replace gas valve. If
pull is felt, check flame sensor/gas valve
socket connections. Clean pins on sensor plug
with emery cloth. (Figure 10). Replace flame
sensor if condition is not corrected.
Check for weak ignition spark, spark
occurring at locations other than ignition
electrode, high drafts across pilot
burner, and damaged pilot burner
assembly. (Figure 8)
Decrease pilot gas pressure. Remove
pilot adjust cover screw and rotate
adjust screw dockwise to decrease gas
pressure (Figure 7}
Attempt to increase pilot gas pressure
by removing pilot adjust cover-screw
and rotating pilot adjust screw
counterclockwise. If pilot flame size
does not increase, check for high drafts
across pilot burner. (Figure 10)
9