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4. Burner Box Hi-Limit Safety Thermostats (for Gas Models Only)
These disc temperature switches have a setting of 330º F (166º C). They are located on the right side of
each burner box, and they are a manual reset type of switch. These switches ensure 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
boxes will increase tripping these switches. This will shut off the gas flow to the burner boxes, and the
Phase 7 will display either “front burner hi-limit fault” or “rear burner hi-limit fault.”
5. Sail Switch (for Gas Dryers Only)
These sail switches are located in the front and back of the burner boxes. 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 burners. This creates a negative pressure inside the burner boxes. This negative
pressure pulls in the round dampers and activates the sail switches. If there is an improper (low) airflow
through the dryer, the sail switch dampers will not pull in, preventing the heat from coming on and the
Phase 7 will display either “front sail switch close fault” or “rear sail switch close fault.”
Low airflow through the dryer will be caused by overly long or block exhaust ducting, lack of make-up air,
or a clogged lint screen.
6. Access and Burner Door Switches
These switches are located behind each of the six (6) doors found on the AD-670 dryer. ALL the doors
must be closed and securely latched for the dryer to operate.
7. Tilt Switches
These switches are located in the front top right of the base for rear tilting dryers and in the rear top right
of the base for forward tilting dryers. The dryer must be in the level position before a drying cycle can be
started.