American Dryer Corp. ML-55 Phase 7, Installation Manual

113345-9

www.amdry.com

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Preparation For Operation/Start-Up ___

The following items should be checked before attempting to
operate the dryer:

•

Read all “CAUTION,” “WARNING,” and “DIRECTION”
labels attached to the dryer.

•

Check incoming supply voltage to be sure that it is the
same as indicated on the dryer data label.  In the case of
208 VAC or 230/240 VAC, the supply voltage must match
the electric service specifications of the data label exactly.

•

Gas Models – check to ensure that the dryer is connected
to the type of heat/gas indicated on the dryer data label.

•

Gas and Electric Models – the sail switch damper
assembly was installed and adjusted at the factory prior
to shipping.  However, each sail switch adjustment must
be checked to ensure that this important safety control is
functioning.  (Refer to Preoperational Tests for Sail Switch
Adjustment).

•

Gas Models – be sure that all gas shutoff valves are in
the open position.

•

Be sure all side and base panels are on the dryer.

•

Check all service doors to ensure that they are closed
and secure.

•

Be sure the lint door is securely in place.

•

Rotate the basket (tumbler/drum) by hand to be sure it
moves freely.

•

Check bolts, nuts, screws, terminals, and fittings for
security.

•

Steam Models – check to ensure air supply (80 psi [5.52
bar]) is connected to the dryers.

•

Steam Models – check to ensure all steam shutoff valves
are open.

•

Steam Models – check steam damper operation.

•

Check basket (tumbler) bearing setscrews to ensure they
are all tight.

Preoperational Tests __________________

All dryers are thoroughly tested and inspected before leaving
the factory.  However, a preoperational test should be
performed before the dryer is publicly used.  It is possible
that adjustments have changed in transit or due to marginal
location (installation) conditions.

Turn on electric power to the dryer.

Open all shutoff valves (gas and steam models only).

Refer to the Operating Instructions for starting your particular
model dryer.

Gas Dryers

When a gas dryer is first started (during initial start-up), it has
a tendency not to ignite on the first ignition attempt.  This is
because the gas supply piping is filled with air, so it may take
a few minutes for the air to be purged from the lines.

Note

During the purging period, check to be sure that all

gas shutoff valves are open.

Gas dryers are equipped with an ignition system, which has
internal diagnostics.  If ignition is not established within three
(3) times, the heat circuit in the module will lock out until it is
manually reset.  To reset the ignition system, open and close
the main door and restart the dryer.

A gas pressure test should be taken at the gas valve pressure
tap of each dryer to ensure that the water column (W.C.)
pressure is correct and consistent.

Note

Water column pressure requirements (measured at

the pressure tap of the gas valve body):

Natural Gas .............. 3.5 Inches (8.7 mb) W.C.

Liquid Propane (L.P.) Gas ....... 10.5 Inches (26.1 mb) W.C.

Important

There is no regulator provided in an L.P. dryer.  The

water column pressure must be regulated at the
source (L.P. tank), or an external regulator must be

added to each dryer.

Steam Dryers

Check to ensure that steam damper is functioning properly

The steam damper should not “slam” (open or closed) when
it reaches the end of (piston) travel.  Additionally, the steam
damper should not bind and/or stop during travel.  If either of
these conditions exist refer to air adjustment instructions in
the 

Steam Information

 section.

Electrically Heated Dryers

Check to ensure that electric oven/contactor assembly is
activating.

Make a complete operational check of all safety related
circuits:

•

Door switch(es)

•

Hi-Limit thermostats

•

Sail switch (for gas and electric models only)

Note

To check for proper sail switch operation (for gas and

electric models only), open the main door and while
holding main door switch plunger in, start dryer.

Dryer should start but heat circuit should not be activated
(on).  If the heat system is activated, the sail switch is
improperly adjusted and must be adjusted by bending the
actuator arm of the sail switch toward the burner box.  If the
actuator arm is bent too far toward the burner box of the
dryer, the dryer may not have heat when needed.  After any
adjustment to the sail switch, the above procedure must be
repeated to verify proper operation of the sail switch.

The dryer should be operated through one (1) complete cycle
to ensure that no further adjustments are necessary and that
all components are functioning properly.

Basket (Tumbler) Coating

The basket (tumbler) is treated with a protective coating.  We
suggest dampening old garments or cloth material with a
solution of water and nonflammable mild detergent and
tumbling them in the basket (tumbler) to remove this coating.

Make a complete operational check of all operating controls.

For microprocessor models check controller (computer)
programs/selections.  Each microprocessor controller
(computer) has been preprogrammed by the factory with the
most commonly used parameter (program) selections.  If
computer program changes are required, refer to the
computer programming manual, which was shipped with
the dryer.