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Section 4 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
21. IGNITION SYSTEM FEATURES
Refer to Figure 10
a. Momentary Power Interruption
(1) Upon resumption of power, sensor
contacts will still be open, permitting
secondary valve to open.
(2) However, with the secondary coil in the
circuit, the booster coil cannot draw
enough current to open the split-coil valve.
(3) When sensor contacts do reclose, the
secondary valve will close, and the burner
system will be in the normal pre-ignition
circuit.
b. Flame Failure
(1) In case of flame failure, the sensor contacts
will reclose in about 45 seconds.
(2) This will close the secondary valve and the
burner system will be in the normal pre-
ignition circuit.
c. Ignition Failure
(1) If flame is not established as sensor
contacts open, secondary valve will remain
open until sensor contacts reclose.
(2) Sensor will continue to recycle the igniter
and secondary valve (about once per
minute) until ignition is made or dryer is
turned off.
d. Dual Input Valve – Models SG4680 and
SG4990
(1) The dual input valve is located after the
secondary valve and will allow an
additional 9,000 BTU’s when opened.
(2) The dual input coil is energized
independently through the low limit
thermostat which opens at 130°F.
(3) This allows extra heat to warm the dryer
cylinder quickly during the initial burn
cycle.
(4) It is not energized again during the
remainder of the cycle.
22. BURNER SYSTEM COMPONENTS –
Gas Models – Silicon Carbide (Glow Bar)
Ignition
a. Complete Gas Valve Assembly.
(1) Through Serial No. S840L627 – Insert
key into access door lock and turn one
quarter turn counterclockwise. Refer to
Figure 11.
Starting Serial No. S840L628 – Remove
Phillips head screw and washer holding
access door to front panel. Refer to
Figure 11.
(2) Apply thumb pressure to right edge of door.
When door opens more door to the left to
disengage from door supports. Refer to
Figure 11.
(3) Close gas shut-off valve and disconnect
wires from sensor, at quick disconnect
blocks. Refer to Figure 12.
(4) Loosen union nut between gas shutoff
valve and nipple connector to gas valve.
Unthread nut from nipple completely.
Refer to Figure 12.
(5) Remove screws holding valve and bracket
to base. Refer to Figure 12.
(6) Lift gas valve and mounting bracket from
base and carefully remove through access
door opening.
NOTE: The holding coil, booster coil and secondary
coil can be replaced individually or in a kit. The
dual input coil is a separate component. Refer to the
parts manual for the correct part numbers.
To Test Dual Input Coil
Refer to Figure 13
1. Disconnect valve wire harness from dryer
harness at molex plug.
2. Set test meter to read ohms and put meter probes
on RED and BLACK wire terminals on valve
side of moles plug. Meter should register
approximately 600 ohms. If you get “no
reading”, replace coil.