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450431-3 www.amdry.com 7
Gas Burner Assembly
Gas heated dryers are equipped with a gas burner assembly
consisting of four burner tubes, gas valve, ignitor, flame-
probe, sail switch, and hi-limit thermostat. The inlet piping
enters through the rear of the dryer on the left-hand side
(viewing from the front) and runs to the front of the dryer
where the gas valve is located.
Reversing Relay Panel
Lifting the control door will reveal the reversing relay box.
Located on the back of the relay box is the reversing relay
panel. Included on this panel is a 4-position terminal block,
blower overload, blower contactor, reversing contactor, 24
VAC transformer, fuse or circuit breaker, ground lug, and
possibly an arc suppressor board.
Blower Motor and Impellor (Gas and Steam)
The impellor is shaft driven. The blower motor drives the
shaft on which the impellor is mounted.
Drive Motor
The T.E.F.C. drive motor is located in the right front hand
corner of the dryer. It sits on an adjustable base so that the
motor can be easily adjusted to the left or right.
NOTE: With the dryer off or no air supply to the damper
piston, the damper is in the cool down mode.
Steam Coil pH Level
NOTE: The normal pH level for copper type steam coils
must be maintained between a value of 8.5 to 9.5. For
steel type steam coils the pH level must be maintained
between a value of 9.5 to 10.5. These limits are set to
limit the acid attack of the steam coils.
IMPORTANT: Coil failure due to improper pH level will
void the warranty.
Steam Coil and Damper System
The steam coil is constantly charged, thereby eliminating
repeated expansion and contraction and also provide instant
heating to start the drying process. The steam damper,
located on top of the steam coil, is the only temperature
controlling device in this system. When the steam damper
is open, ambient air is drawn through the coil providing
heat to the dryer. When the steam damper is closed, ambient
air is drawn directly into the tumbler, bypassing the coil,
allowing a rapid cool down.