82
505039
Section 7 Test Procedures
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the dryer(s) before servicing.
• Close gas shut-off valve to gas dryer(s) before servicing.
• Never start the dryer(s) with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the dryer is properly grounded.
W001R1
WARNING
63. BURNER SYSTEM OPERATION – SILICON
NITRATE IGNITION
(Figure 65)
a. Components
The burner has four basic components: a glow
bar igniter, burner tube, flame sensor, and a
two-stage gas valve consisting of a main valve
and a redundant coil valve.
b. Pre-ignition Circuits
When the dryer thermostat calls for heat,
circuits are completed through the main and
redundant coil, flame sensor, and igniter.
c. Burner Circuit
In approximately 30 seconds, the igniter attains
ignition temperature and ignition is made. The
flame sensor circuit is completed through the
burner flame to the ignition control board.
d. Ignition Failure
If ignition failure occurs, the ignition control
will reset to its pre-ignition state within
approximately 45 seconds. After four failed
attempts at ignition, the ignition control will
lock-out the igniter. Refer to Paragraph 15 for
ignition control flashes.
Figure 65
REDUNDANT
COIL
MAIN
COIL
GAS VALVE FOR SILICON NITRATE IGNITION
D340SE3A
1
2
REDUNDANT
COIL
MAIN
COIL
WIRING SCHEMATIC
IGNITER
IGNITION
CONTROL
GROUND
FLAME
SENSOR
220/240 VOLT,
50 HERTZ
ELECTRICAL
SUPPLY LINE
D332SE3A
