Service manual

VSX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
Page 24 of 40
FLAME SENSE PROBE (GAS)
WARNING:
THE FOLLOWING STEPS REQUIRE
POWER TO BE APPLIED TO THE UNIT DURING
THE TEST. USE EXTREME CAUTION AT ALL
TIMES.
1. Assure that the unit has a proper ground, correct
polarity and that the value of incoming voltage
is correct.
A. Check the flame sense voltage (burner on)
between the flame sense lead wire
termination in the ignition module edge
connector and ground with a VOM set on
DC volts. The voltage measurement will
fluctuate but should be no less than 20
VDC.
B. If voltage is less than indicated, replace
flame sense probe and check unit for proper
operation.
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 for alignment and adjust
as necessary.
A. The center line of the probe should be
approximately 1 15/16 inches from the face
of the burner and 5/16 inches up from the
center line of the burner.
3. If no adjustments can be made to the probe to
correct its alignment then replace and check
unit for proper operation.