Alliance Laundry Systems FES17AxF, Сервисная инструкция

Страница: 76 / 82

74
512261
Section 7 Test Procedures
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
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
66. BURNER SYSTEM OPERATION
(Gas Models – Refer to Figure 47 .)
a. Components
This burner has four basic components: a
silicon carbide (glow bar) igniter, burner tube,
sensor, and a two-stage gas valve consisting of
a split-coil valve and a secondary coil valve.
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
When the dryer thermostat calls for heat,
circuits are completed through the holding coil,
sensor, booster coil and igniter. Both coils must
be energized to open the split-coil valve. Once
opened, the holding coil can hold the valve
open without assistance from the booster coil.
The sensor triggers the current to travel around
the secondary coil and through the igniter,
causing the igniter to get hot.
c. Burner Circuit
In approximately 30 seconds, the igniter attains
ignition temperature and ignition is made. The
heat from the burner flame causes the sensor
contacts (located on burner housing beside the
igniter) to open. A circuit is then completed
through the secondary valve coil, opening the
valve and allowing gas to flow.
d. Momentary Power Interruption
Upon resumption of power, sensor contacts will
still be open, permitting secondary valve to
open. However, with the secondary coil in the
circuit, the booster coil cannot draw enough
current to open the split-coil valve. When
sensor contacts do reclose, the secondary valve
will close, and the burner system will be in the
normal pre-ignition circuit.
e. Flame Failure
In case of flame failure, the sensor contacts will
re-close in about 45 seconds. This will close the
secondary valve and the burner system will be
in the normal pre-ignition circuit.
f. Ignition Failure
If flame is not established as sensor contacts
open, secondary valve will remain open until
sensor contacts re-close. Sensor will continue to
recycle the igniter and secondary valve (about
once per minute) until ignition is made or dryer
is turned off.
Figure 47
Secondary
Coil
Holding Coil
and
Booster Coil
(Split Coil Valve)
4
1
5
2 3
D267SE3B
Sensor
SECONDARY
COIL
HOLDING
COIL
BOOSTER
COIL
Igniter
120 Volt, 60 Hertz
Electrical
Supply Line
D268SE3A