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K. Sail Switch (Gas Models Only)
The sail switch is located on the front 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 fan or 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 improper air flow, the damper will
not pull in, preventing the burner from starting. The display will also
read "no airflow flow" with an audio indication. Improper airflow can be
caused by improperly designed exhaust ducting where the duct run is
too long or has too many sharp bends in it. It can also be caused by a
lack of makeup air.
L. Hi-Limit (Gas Models Only)
Prior to May 26, 1998. The high limit thermostat is an
automatic reset disc-type thermostat set at 330º F and
located near the burner. If the burner flame gets too hot,
this thermostat will shut off the burner. This is generally
caused by low airflow through the dryer. In a hi-limit
situation the display will read "bURNER SAFETY FAIL"
with an audio indication.
As of May 26, 1998. The high limit thermostat is a
manual reset disc-type thermostat set at 330º F and lo-
cated near the burner. If the burner flame gets too hot,
this thermostat will shut off the burner. This is generally
caused by low airflow through the dryer. In a hi-limit
situation the display will read "bURNER SAFETY FAIL"
with an audio indication. The manual reset thermostat
must be reset manually or the 24VAC burner circuit will
never be complete. This will cause the phase 6 to con-
tinue to go off on "bURNER SAFETY FAIL" with an
audio indication.