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ML-96 / ML-122
Service Manual
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781 USA
Telephone: +1 (508) 678-9000 / Fax: +1 (508) 678-9447
e-mail: techsupport@amdry.com
www.amdry.com
ADC Part No. 450412-4
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Retain This Manual In A Safe Place For Future Reference American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this product is properly maintained, it will provide many years of safe, efficient, and trouble free operation. ONLY qualified technicians should service this equipment. OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with the dryer. The following “FOR YOUR SAFETY” caution must be po
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Table of Contents _______ IMPORTANT You must disconnect and lockout the electric Important Information ............................................ 4 supply and the gas supply or the steam supply Safety Precautions .............................................. 4 before any covers or guards are removed from the machine to allow access for cleaning, Routine Maintenance............................................. 4 adjusting, installation, or testing of any Cleaning...............................
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For personal safety, the dryer must be electrically grounded Important Information _______________ in accordance with local codes and/or the National Electrical Safety Precautions Code ANSI/NFPA NO. 70-LATEST EDITION or in Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1- WARNING: For your safety, the information in 1990 or LATEST EDITION. this manual must be followed to minimize the ! risk of fire or explosion or to prevent property NOTE: Failure to do so will void the warranty. dama
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NOTE: Frequency can best be determined at each Lubrication location. The drive shaft bearings and idler shaft bearings should be lubricated every 3 months. Use a #3 grease or Daily equivalent. Lubrication is necessary. (Beginning) of each work shift. The motor bearings and under normal/most conditions Clean lint from the drawer and screen. Inspect lint screen the tumbler bearing are permanently lubricated. It is and replace if torn. physically possible to re-lubricate the tumbler bearing if
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CAUTION: Improperly sized or installed Make a complete operational check of all the operating exhaust ductwork can create a potential fire controls to assure that the timing is correct, temperature ! hazard. selection switches are functioning, etc. Make a complete operational check of all safety-halted circuits: door switches, hi-limit thermostat, sail switch, Electrical and Gas Requirements cycling thermostats, etc. It is your responsibility to have all electrical connections For gas dryers a g
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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. 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 l
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Drive Shaft Assembly Main Door Switch (Viewing from the front of the dryer) The main door switch is mounted to the front panel behind the main door. When the main door opens, the switch will Behind front panel on the right side of the dryer, you can also open, preventing the dryer from operating. The main view the drive shaft assembly, which consists of a 9-inch door switch is a safety device and should never be disabled. (22.86 cm) drive pulley, two 6-inch (15.24 cm) wheels, and two 1-inch (2
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Temperature Sensor Bracket Servicing _____________________________ This is located inside the dryer in the lint compartment Introduction above the lint screen. This bracket consists of 2 devices. All electrical and mechanical service or repairs should be One is a temperature sensor probe and the other is a high made with the electrical power to the dryer disconnected limit thermostat, which is set at 225º F (107º C). (power off). WARNING: Personal injury could result. ! The information provided
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Connect keypad ribbon to the computer. The flame-probe, ignitor probe, and ground rod are all on the same line of axis. Reestablish electrical power to the dryer. There should be a 1/8” gap (+/- 1/32) between the ignitor probe and ground rod. Microprocessor Temperature Do not wrap the red high voltage wire and flame-probe Sensor Probe Replacement wire together. (Improper operation may result.) They may Discontinue electrical power to the dryer. run along side each other. Remove perforated pane
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WARNING: Test all connections for leaks by Ignition Module Replacement brushing on a soapy water solution. Discontinue electrical power to the dryer. ! NEVER TEST FOR LEAKS WITH A FLAME!!! Remove the wires connected to the terminal strip at the bottom of the module. (Mark correct location of each wire to aid in replacement on new module). To Convert Natural Gas to L.P. Gas Remove the 2 pal nuts securing the module to the mounting NOTE: All dryers are sold as natural gas, unless bracket. otherwi
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Tumbler Hi-Limit Thermostat Sail Switch Adjustment (225º F [107º C]) Replacement With the dryer operating at a high temperature setting, pull Disconnect electrical power to the dryer. the sail switch away from the burner. The sail switch should open and extinguish the burner. Let the sail switch damper Open lint door. return to the burner wall. The sail switch should close to Locate sensor bracket assembly, remove the 2 nuts restart the burner ignition cycle. If the sail switch circuit secur
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Steam Coil Replacement WARNING: The 1/2” plug must be closed before Discontinue electrical service to the dryer. ! attempting to apply any steam pressure. Disconnect compressed air supply from the dryer. Slowly open the return line then slowly open the supply Shut off all steam supply lines and steam return valves line. that feed the steam coil. Wait a sufficient amount of time until all of the steam lines and the steam coil is cool. Open 1/2” plug on the return line to bleed off any residual st
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Main Door Assembly Replacement IMPORTANT: When pulling the front panel off, the door switch harness in the upper right hand corner must be Open main door. unplugged. Holding the door upward remove the 2 screws from the top hinge block. NOTE: The main door assembly can be removed to make the panel removal easier. Refer to “Replace Main Lift the door up to remove. Door Assembly” directions. Reverse this procedure for reinstalling new main door assembly. Reinstall the new front panel by reversing
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Tumbler Wheel Replacement on Drive Assembly Discontinue electrical power to the dryer. Remove front panel from dryer. (Follow front panel replacement directions on page 14.) Remove the 10 1/4-20 x 1/4” socket button head screws from the perforated basket side. Remove wrapper assembly. Loosen V-belt. Rotate pulley and V-belt out of the groove. Block the tumbler assembly in position. IMPORTANT: Tighten screws evenly and progressively. Remove the setscrew from the 9-inch (22.86 cm) pulley. Never
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Check the basket drive belt for proper tension. Adjust if necessary. Replace the wrapper panels. Replace the perforated tumbler panel. 1-15/16 (5 cm) Flange Bearing Replacement Disconnect electrical power to the dryer. Remove the 4 bolts securing the bearing cap located in the rear of the dryer. And remove. Depress the tabs on the rotational sensor harness plug and pull apart. Remove the retaining ring from the tumbler shaft. Remove the 4 bolts, lock washers and flat washers Depress the tabs o
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Refer to basket assembly section page 15 for shaft and basket alignment. V-Belt Adjustment (Motor to Drive Axle) Discontinue electrical power to the dryer. Remove the belt guard cover from the rear of the dryer. Loosen the 4 bolts holding the drive motor mount to the side of the dryer. Loosen the jam nuts on the adjustment screw on the top of the motor mount. Turn the adjustment screw to lower the motor mount (to tighten the belts) or raise the motor mount (to loosen the belts.) Check the vertic
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Lint Door Switch Replacement No L.E.D. display on microprocessor controller (computer)... Discontinue electrical power to the dryer. Open circuit breaker switch or blown fuse. Remove the lint door panel. (For the ML-122.) Tripped blower motor overload. Remove the front panel. (For the ML-96.) Faulty wiring connection. Disconnect both 4-pin connectors at the rear of the lint switch cover. Faulty transformer. Remove the 2 screws holding the lint switch cover on. “Emergency Stop” (E-Stop) button
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Overload for impellor (fan) motor Phase 6 OPL System Diagnostics ___ is tripping... IMPORTANT: You must disconnect and lockout the Either an exceptionally low or high voltage supply. electric supply and the gas supply or the steam supply before any covers or guards are removed from the Motor bearing failure. machine to allow access for cleaning, adjusting, Motor vents are blocked with lint. installation, or testing of any equipment per OSHA standards. Failed motor. Failed overload. All major cir
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bURNER CONTROL FAIL – This routine monitors the ignition ROTATE SENSOR FAIL – Indicates a rotational sensor circuit control’s gas valve output response. If the valve output failure meaning that there is a fault somewhere in the signal is not present from the ignition control within the tumbler rotating circuit, or the Phase 6 OPL microprocessor valve time limits the Phase 6 microprocessor controller controller (computer) program related to this circuit (computer) determines the ignition control
