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Section 5 Service 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
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
28. BURNER SYSTEM OPERATION
Refer to Figure 12
a. Components
(1) This burner has four basic components:
(a.) A silicon carbide (glow bar) igniter
(b.) Burner tube
(c.) Sensor
(d.) Two-stage gas valve consisting of a
split-coil valve and a secondary coil
valve.
(2) The split-coil valve is opened when the
dryer thermostat calls for heat, while the
secondary valve does not open until the
igniter has attained ignition temperature.
b. Pre-Ignition Circuits
(a.) When the dryer thermostat calls for
heat, circuits are completed through
the holding coil, sensor, booster coil
and igniter.
(b.) Both coils must be energized to open
split-coil valve.
(c.) Once opened, the holding coil can
hold the valve open without assistance
from the booster coil.
(d.) The current shunted around the
secondary coil by the sensor, passes
through the igniter causing it to get
hot.
c. Burn Circuit
(1) In approximately 30 seconds, the igniter
attains ignition temperature and the sensor
(located on burner housing beside the
igniter) contacts open.
(2) A circuit is then completely through the
secondary valve coil, opening the valve
and allowing gas to flow.
(3) Ignition is made and the heat from the
burner flame causes the sensor contacts to
remain open.
