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D. SAFETY DEVICES
1. Load/Unload Door Switches
There are two (2) of these switches located above the main loading doors. These switches ensure that the
doors are closed before the dryer can start and ensures that the doors are fully open before the dryer will
tilt. If the dryer is started when the load doors are open, the microprocessor controller (computer) light
emitting diode (L.E.D.) 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, the
microprocessor controller (computer) L.E.D. display will show “lint drawer open” and will not reset until
the lint drawer has remained open for 15-seconds.
3.
Exhaust Hi-Limit Safety Thermostat
The manual reset exhaust hi-limit switch is a thermostat type switch located on a hinged door bolted to the
exhaust duct in the burner cabinet. Its function is to discontinue heat (flame) in the event of an over
temperature situation (above 235° F [113° C]). This will shut off the gas flow to the burner boxes; and the
display will read an error code of “Tumbler Hi-Limit Fault.” The manual reset hi-limit safety must be
manually reset and the Phase 7 computer must be reset.
4.
Burner Box Hi-Limit Safety Thermostats (for Gas Dryers Only)
These disk temperature switches have a setting of 330° F (166° C). They are located on the burner hi-limit
bracket mounted through the top of the heat console. They are an automatic reset type of switch. These
switches ensure that there is a 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 boxes will increase tripping these switches. This will shut off the gas flow to
the burner boxes; and the display will read an error code of “Burner Hi-Limit Fault.” The thermostat will
automatically reset and the Phase 7 computer must be reset.
5. Sail Switch (for Gas Dryers Only)
The sail switch is located in the rear left hand corner of the dryer closest to the lint drawer. 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 lint drawers. This creates a negative pressure inside the dryer.
This negative pressure pulls in the sail switch. If the sail switch does not pull in, this will prevent the heat
circuit from energizing and the computer will display a front sail switch fault.