American Dryer Corp. Phase 6 Microprocessor Controls ML-190HS, Service Manual, Page: 12 / 63

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IMPORTANT: Failure to comply with these codes or ordinances and/or the requirements stipulated
in this manual can result in personal injury or component failure.
The gas dryer installation must meet the AMERICAN NATIONAL STANDARD, NATIONAL FUEL GAS
CODE ANSI Z223.1-LATEST EDITION, as well as, local codes and ordinances, and must be done by a
qualified technician.
NOTE: Undersized gas piping will result in ignition problems and slow drying and can create a safety
hazard.
The dryer must be connected to the type of gas (natural or L.P.) indicated on the dryer data label. If this
information does not agree with the type of gas available, contact the distributor who sold the dryer or contact the
factory.
The gas input ratings shown on the dryer data label are for elevations up to 2,000 feet, unless elevation requirements
of over 2,000 feet were specified at the time the dryer order was placed with the factory. The adjustment for
dryers in the field for elevations over 2,000 feet are made by changing the burner orifices. If this adjustment is
necessary, contact the distributor who sold the dryer or contact the factory.
NOTE: Any burner changes must be made by a qualified technician.
C. OPERATIONAL SERVICE CHECK PROCEDURE
1. Turn on electric power to the dryer.
2. To start dryer:
a. Display will read “READY.”
b. Press “E” on the keyboard (touchpad) of microprocessor controller (computer).
c. The dryer will start, and the display will show “Drying Manual Cycle E,” “Dry Temp _,” “Cool Temp_,”
“30 Min Remain.”
NOTE: Pressing keyboard (touchpad) “A,” “B,” “C,” “D,” and “F” will also start the dryer. Six (6)
preprogrammed drying cycles (“A” through “F”) have been stored in the computer’s memory.
(Refer to Computer Operator’s Manual for details.)
3. Make a complete operational check of ALL the operating controls to assure that the timing is correct,
temperature selection switches are functioning, etc.
4. Make a complete operational check of ALL safety-related circuits: door switch(es), hi-limit thermostat, sail
switch, cycling thermostats, etc.
5. For gas dryers a gas pressure test should be taken at the gas valve pressure tap of each dryer to assure that
the water column pressure is correct and consistent.