12 American Dryer Corporation 450412-4
Tumbler Hi-Limit Thermostat
(225º F [107º C]) Replacement
Disconnect electrical power to the dryer.
Open lint door.
Locate sensor bracket assembly, remove the 2 nuts
securing bracket assembly to the tumbler wrapper.
Remove bracket assembly by slightly sliding bracket toward
the rear of the dryer and to the left.
Disconnect sensor bracket harness connector and remove
bracket assembly from dryer.
Disconnect the 2 “orange” wires from the thermostat.
Disassemble thermostat from bracket assembly by
removing the 2 mounting screws, washers and nuts.
Reverse this procedure for installing a hi-heat protector
thermostat.
Reestablish electrical power to the dryer.
Sail Switch Assembly (Gas Models Only)
Sail Switch Replacement
Discontinue electrical power to the dryer.
Remove the 2 screws, which hold the sail switch box cover
to sail switch box.
Disconnect the 2 wires from the switch.
Disassemble sail switch from mounting bracket by
removing the 2 screws securing switch in place.
Reverse this procedure for installing new sail switch. Adjust
sail switch as described in the next section.
Sail Switch Adjustment
With the dryer operating at a high temperature setting, pull
the sail switch away from the burner. The sail switch should
open and extinguish the burner. Let the sail switch damper
return to the burner wall. The sail switch should close to
restart the burner ignition cycle. If the sail switch circuit
does not operate as described, bend the actuator arm of
the sail switch accordingly until proper operation is
achieved. To check proper “open” position of sail switch,
open main door, manually depress main door switch and
start dryer. With the main door open and the dryer operating,
the sail switch should be open, and the burner should not
come on.
Steam Damper Actuator SystemService and Replacement
Steam Damper Cylinder or Piston Replacement
Disconnect compressed air supply from the dryer.
Disconnect tubing from the piston.
Remove the spring clip from clevis pin then slide out the
clevis pin.
Remove the steam damper cylinder (piston).
To install new steam damper cylinder (piston), reverse
above procedure.
Steam Solenoid Valve Replacement
Disconnect compressed air supply from the dryer.
Discontinue electrical service to the dryer.
Disconnect wires in junction box.
Remove tubing from the inlet side of the valve.
Remove the valve from the bracket.
Unscrew the valve from the outlet side.
To install new steam solenoid valve, reverse above
procedure.
Needle Valve Replacement
Disconnect compressed air supply from the dryer.
Remove tubing from the valve.
Unscrew needle valve from the solenoid valve.
To install new needle valve, reverse above procedure.