Burner System Operation; Ignition System Features; Electric Circuit To Ignition System; Temperature Settings - Amana Home Laundry Dryers Service Manual

Component Testing Information
To avoid risk of electrical shock, personal injury, or death, disconnect power to dryer and shut-off gas supply
before servicing, unless testing requires it.

Burner System Operation

Components
This burner has four basic components: A silicon
carbide (glow bar) ignitor, burner tube, flame sensor,
and a two-stage gas valve consisting of a split-coil
valve and a secondary coil valve. The split-coil valve
opens when the dryer thermostat calls for heat, while
the secondary valve does not open until the ignitor
has obtained ignition temperature.
Pre-Ignition Circuits
When the dryer thermostat calls for heat, circuits are
completed through holding coil, flame sensor, booster
coil, and ignitor. Both coils must be energized to open
the split-coil valve. Once opened, holding coil can hold
the valve open without assistance from the booster
coil. The current travels around the secondary coil by
the flame sensor, passing through the ignitor, causing
it to get hot.
Burner Circuit
In approximately 30 seconds, the ignitor attains
ignition temperature and the flame sensor (located on
burner housing beside the ignitor) contacts open. A
circuit is then completed through the secondary valve
coil, opening the valve and allowing gas to flow.
Ignition is made and the heat from the burner flame
causes the flame sensor contacts to open.

Ignition System Features

Momentary Power Interruption
Upon resumption of power, flame 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 flame sensor contacts do
reclose, the secondary valve will close, and the burner
system will be in the normal pre-ignition circuit.
Flame Failure
In case of flame failure, the flame sensor contacts will
reclose in about 45 seconds. This will close the
secondary valve and the burner system will be in the
normal pre-ignition circuit.
Ignition Failure
If flame is not established as flame sensor contacts
open, secondary valve will remain open until flame
sensor contacts reclose. Flame sensor will continue to
recycle the ignitor and secondary valve (about once
per minute) until ignition is made or dryer is turned off.
!
WARNING

Electric Circuit to Ignition System

Testing Procedures
1. Disconnect power cord from power source.
2. Close gas valve shut-off valve.
3. Remove service access panel, by removing
screws located at the bottom of panel. Pull
outward on the bottom of service access panel to
release panel locators from front panel.
4. Disconnect terminal connectors from gas valve.
5. Attach meter probes to terminals on gas valve
connector to terminals 1 and 2. Set meter to read
at least 120 VAC.
6. Plug power cord in, and start dryer in a heat
setting.
7. Meter should register line voltage in all fabric
settings, except FLUFF position which should
indicate 0 VAC.
8. If meter does not indicate proper voltage readings
as indicated in step 7, verify motor switch,
thermostat, fabric switch or timer is operating
properly.

Temperature Settings

Unit with Fixed 3−Position Switch
• FLUFF (No heat) and DELICATE average
temperature setting of (129° F).
• PERMANENT PRESS / REGULAR average
temperature setting of (160° F).
Unit with Fixed 4−Position Switch
• FLUFF (No heat) and DELICATE average
temperature setting of (129° F).
• PERMANENT PRESS average temperature
setting of (150° F).
• REGULAR average temperature setting of (160° F).
NOTE: During testing, dryer should operate for
15
several minutes to stablize temperature.
RS3200007 Rev. 0