Trane S8B1A040M3PSC Installation, Operation And Maintenance Manual page 74

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
DEFINITION:
The flame sense current is less
than 0.5 micro-amp DC
Correct flame sensor
loca on
Check opera on
1.586 REF
.239 REF
.585 REF
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)
74
Is flame sensor
NO
located correctly?
See figure
YES
Replace flame
sensor
08 Fault Code
Make a call for
hea ng
Once flame has been
established, set meter to DC
volts and measure across
flame sense pads labeled FP
Is flame current
YES measured less than 0.5
micro-amp DC?
NO
Flame sensor is
good. Check wiring
and / or
connec ons.
1.470 REF
.385 REF
.442 REF
Flame Sensor
S8XB-SVX001-1B-EN