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D. SAFETY DEVICES
1. Load Door Switches
There are two (2) of these switches located under the main loading doors. These switches ensure that
the doors are closed before the dryer can start. If the dryer is started when the load doors are open, the
microprocessor controller (computer) L.E.D. (light emitting diode) display will show "door."
2.
Lint Basket Switch
This switch ensures that the lint basket is closed before the dryer can start. This switch is located at the
front of the dryer at the right side of the lint basket. If the lint basket is open when the dryer is started, then
the microprocessor controller (computer) L.E.D. display will show "door."
3.
Tumbler (Basket) Hi-Limit Safety Thermostat
This disk temperature switch has a setting of 225º F (107º C). It is located below the tumbler (basket) on the
temperature sensor bracket, along side the computer sensor, and is an automatic reset type of switch.
Access to this switch is gained by sliding/pulling the lint basket completely out of the dryer.
This switch backs up the computer sensor and in case of a computer sensor malfunction will prevent the
tumbler's (basket's) temperature from becoming excessive. If this switch trips, the gas flow to the burner
box will be shut down; however, the tumbler (basket) will still rotate.
4. Burner Box Hi-Limit Safety Thermostat
This disk temperature switch has a setting of 330º F (165º C). It is located on the right side of the burner box,
and it is a manual reset type of switch. This switch ensures that there is proper airflow through the burner
box. Upon a low airflow condition, which may be caused by a clogged lint screen, excessively long or
blocked exhaust duct, or improper make-up air, the temperature in the burner box will increase tripping this
switch. This will shut off the gas flow to the burner box and the dryer will not heat until this thermostat is
reset, however the tumbler (basket) will still run.
5. Sail Switch (for Gas Dryers ONLY)
The sail switch is located in the front top of the burner box. A sail switch consists of a round damper plate
on a lever arm which is in contact with an electric switch. When the air blower comes on, it draws air
through the gas burner. This creates a negative pressure inside the burner box, and this negative pressure
pulls in the round damper and activates the sail switch. If there is an improper (low) airflow through the
dryer, the sail switch damper will not pull in, preventing the heat from coming on.
Low airflow through the dryer will be caused by overly long or blocked exhaust ducting, lack of make-up air,
or a clogged lint screen.