Trane S9V2B040U3PSBC/D Installation, Operation And Maintenance Manual page 117

DEFINITION:
The flame sense current is less
than 0.5 micro-amp DC
Correct flame sensor
loca on
Check opera on
Flame Sensor
There are two flame sense pads located on the IFC,
marked "FP". To measure flame current, use a VOM set
to DC volts. Flame current will vary depending on the
type of meter used. Typical flame current ranges from
0.75 – 3.0 micro-amps (0.75 – 3.0 VDC)
S9V2-SVX001-1A-EN
Is flame sensor
NO
located correctly? YES
See figure
YES
Replace flame
sensor
08 Fault Code
st
Make a call for 1
stage hea ng
Once flame has been
established, set meter to DC
volts and measure across
flame sense pads labeled FP
Ensure all burner flames directed into
heat exchanger with a ght pa ern?
(inadequately aired burners tend to
roll back)
Is flame current
measured less than 0.5
micro-amp DC?
NO
Flame sensor is good.
Check wiring and / or
connec ons.
T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
117