Flame Sense Probe (Gas Model) - Vulcan-Hart VGCTS16 Service Manual

ROUND TILTING BRAISING PANS - SERVICE PROCEDURES AND ADJUSTMENTS
FLAME SENSE PROBE
(Gas Model)
WARNING: THE FOLLOWING STEPS REQUIRE
POWER TO BE APPLIED TO THE UNIT DURING
THE TEST. USE EXTREME CAUTION AT ALL
TIMES.
1. Assure proper ground, correct polarity and that
the value of incoming voltage is correct.
A. Check the flame sense probe micro amp
current by disconnecting the fame sense
probe lead from the terminal strip and
placing a V-O-M in series.
B. Switch the meter leads to measure current
and set the meter to read micro amps DC.
C. Open the gas valve, turn power switch ON
and set thermostat.
D. Observe meter reading.
1) If the reading is greater than 0.5
micro amps DC then the problem is
not with the FSP. Replace ignition
control module and check for proper
operation.
2)
2. Perform a visual check to determine if the
flame sense probe is in the upper portion of
flame. If the probe is bent or not in the upper
portion of the flame then check alignment and
adjust as necessary.
A. The center line of the probe should be
approximately 2 9/16 inches from the
underside of the pan and 4 inches up from
the center line of the burner.
B. If no adjustments can be made to the
probe to correct its alignment then replace
and check unit for proper operation.
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If the reading is less than 0.5 micro
amps, turn thermostat and power
switch OFF. Check the flame sense
probe for corrosion or grease build up
and for loose or dirty connections on
the terminal strips under the right and
left console covers. If FSP is dirty,
clean with sandpaper and repeat step
1C. Also, Check the flame sense
probe position as outlined below in
step two. Lastly, visually inspect the
burner flame. If flame appears low or
not burning correctly, then check the
gas manifold pressure as outlined
under "MANIFOLD PRESSURE
ADJUSTMENT (GAS MODELS). If
pressure is not set correctly then
adjust and check for proper operation.