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ML-175 / ML-190
Service Manual
Phase 6 / Phase 7
Microprocessor Controls
American Dryer Corporation
88 Currant Road
Fall River, MA 02720-4781
Telephone: (508) 678-9000 / Fax: (508) 678-9447
E-mail: techsupport@amdry.com
www.amdry.com
ADC Part No. 450431-3
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Retain This Manual in a Safe Place for Future Reference This product embodies 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 posted near the dryer i
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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 before any covers or guards are removed from Safety Precautions ............................................... 4 the machine to allow access for cleaning, Routine Maintenance.............................................. 4 adjusting, installation, or testing of any equipment per OSHA standards. Clean
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Important Information ________________ ! WARNING Safety Precautions Articles left in the dryer after the drying and Do not store or use gasoline or other flammable vapors and cooling cycles have been completed can create a liquids in the vicinity of this or any other appliance. fire hazard. Purchaser/user should consult the local gas supplier for proper instructions to be followed in the event the user smells gas. The instructions should be posted in a prominent This dryer is not to be used i
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Daily Adjustments (Beginning) of each work shift. 7 Days After Installation and Every 6 Months Clean lint from the drawer/screen. Inspect lint screen and Inspect bolts, nuts, screws, (bearing setscrews), replace if torn. nonpermanent gas connections (unions, shutoff valves, orifices, and grounding connections). Motor and drive belts should be examined. Cracked or seriously frayed belts should Weekly be replaced. Tighten loose V-belts when necessary. Complete operational check of controls and
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IMPORTANT: Make-up air must be provided from a Operational Service Check Procedure source free of dry cleaning fumes. Make-up air that is Turn on electric power to the dryer. contaminated by dry cleaning fumes will result in To start dryer: irreparable damage to motors and other dryer components. Display will read “READY.” Press “E” on the keypad of microprocessor controller Exhaust ductwork should be designed and installed by a (computer). competent technician. Improperly sized ductwork will
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Reversing Relay Panel Gas Burner Assembly Lifting the control door will reveal the reversing relay box. Gas heated dryers are equipped with a gas burner assembly Located on the back of the relay box is the reversing relay consisting of four burner tubes, gas valve, ignitor, flame- panel. Included on this panel is a 4-position terminal block, probe, sail switch, and hi-limit thermostat. The inlet piping blower overload, blower contactor, reversing contactor, 24 enters through the rear of the dr
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Idler Shaft Assembly Tumbler Shaft Support The idler shaft is located on the left side of the machine and The tumbler shaft support is located in the rear, is just above the blower motor. The idler shaft assembly approximately at the center of the dryer. The arrangement consists of one 11-inch (27.94 cm) drive wheel and two pillow consists of a tumbler shaft support bracket, two high impact ® discs, and a block bearings. wheels, tumbler adjustment plate, Teflon rotational sensor assembly. Spe
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Main Door Switch Burner Hi-Limit (Gas Models Only) The main door switch is located near the main door hinge. A burner hi-limit thermostat is located on the burner. This is When the main door opens, the switch will also open, a manual reset disc-type thermostat set at 330° F (165° C). preventing the dryer from operating. The main door switch If the flame in the burner should get too hot, this thermostat is a safety device and should never be disabled. will shut off the burner. This is generall
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Lint Drawer Servicing ______________________________ The lint drawer is located at the bottom of the dryer in the lint Introduction compartment. Simply grab the lint drawer handle, slide out All electrical/mechanical service or repairs should be made the drawer, brush off the lint, and slide the drawer back in. with the electrical power to the dryer disconnected (power off). ! WARNING Personal injury could result. The information provided in this section should not be misconstrued as a device
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To Replace Keypad Label Assembly Disconnect the two “orange” wires from the high heat (225° F [107° C]) thermostat, and remove modular bracket Discontinue electrical power to the dryer. connector, wires, and probe from bracket assembly. Unplug keypad ribbon from rear of computer. Install new sensor probe assembly (ADC P/N 880251) by Slowly peel off and remove keypad label assembly from reversing procedure. control panel. Reestablish electrical power to the dryer. Peel paper backing off new keypa
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To Test and Adjust Gas (Water Column) Pressure There are two types of devices commonly used to measure water column pressure. They are spring/mechanical-type gauges and manometers. The spring/mechanical-type gauge is not recommended, because it is easily damaged and not always accurate. A manometer is simply a glass or transparent plastic tube with a scale in inches. When filled with water and pressure applied, the water in the tube rises showing the exact water column pressure. NOTE: Manome
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To Convert from Natural Gas to L.P. Gas ! WARNING NOTE: All dryers are sold as natural gas, unless otherwise specified at the time the dryer order was placed. For L.P. Test all connections for leaks by brushing on a gas the dryer must be converted as follows. soapy water solution. Never test for leaks with a flame!!! Remove the four screws which secure the top cap assembly. This assembly contains the regulator adjustment screw and the terminal connections. To Replace HSI Module / DSI Module R
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Reverse procedure for installing new thermostat. To Adjust Sail Switch Reestablish electrical power to the dryer. 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 To Replace Lint Compartment return to the burner wall. The sail switch should close to Hi-Heat Protector (225° F [107° C) Thermostat restart the burner ignition cycle. If the sail switch circuit does n
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To Install New Main Door Glass Remove the twelve Phillips head screws securing front panel to dryer. Remove main door assembly from dryer (follow main door removal procedure). Pull wires up through front panel door switch wire channel and gently remove front panel assembly. Lay main door on flat surface with front of door face up. Reverse this procedure for installing new front panel. Remove the four #10-32 Acorn nuts. Reestablish electrical power to the dryer. Remove glass and clean all old sea
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IMPORTANT: Tighten screws evenly and progressively. Never allow the sheave to be drawn in contact with the flange of the bushing. This gap should measure from 1/8” to 1/4”. Proper cap screw torque is 30 ft.-lb. If greater tightening forces are applied, excess pressures will be created in the hub of the mounted sheave, which may cause it to crack. To Replace Motor Pulley Discontinue electrical power to the dryer. Remove the lint drawer. Remove the lint door. Loosen V-belts, then rotate pulley
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To Replace Rear Tumbler Shaft Support Wheels Disconnect electrical power to the dryer. Remove the four nuts securing the rear support box to the dryer. ® Remove the center Allen head bolt and Teflon washer. Loosen the individual wheel bolts so the rear of the box can be removed. Remove the damaged wheel. Replace with new wheel. Reverse steps to replace support box. Reestablish electrical power to the dryer. NOTE: Don’t over tighten wheel bolts, which could bind Clean the shaft and slide the pill
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V-Belt Replacement Basket and Support (Drive Shaft To Speed Reducing Shaft) To Replace Tumbler and Tumbler Support Discontinue electrical power to the dryer. Discontinue electrical power to the dryer. Remove the lint drawer. Follow procedure for removal of main door assembly. Remove the lint door. Follow procedure for removal of front panel assembly. Loosen two bolts securing rear pillow block bearing on the Remove bearing back guard. drive shaft. To remove tumbler assembly and support, loosen t
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Remove old motor pulley and bushing and place on new Loosen the four bolts securing the fan shaft assembly to motor. Follow “To Replace Motor Pulley”. the base of the dryer. Reverse these steps to replace drive motor. NOTE: Models with rear access, it may be easier to remove this plate, to remove the two rear fan shaft assembly bolts. Remove the fan assembly through front access hole. Loosen the setscrews in each bearing. Loosen the four flange bolts and two pillow block bolts. Using a pulley,
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To Replace Lint Drawer Switch No L.E.D. display on microprocessor controller (computer)... Disconnect electrical power to the dryer. Open circuit breaker switch or blown fuse. Remove lint drawer and lint door. Tripped blower motor overload. Disconnect both 4-pin connectors at the rear of the lint switch cover. Faulty wiring connection. Remove the one or two screws holding the lint switch cover Faulty transformer. on. “Emergency Stop” (E-Stop) button is depressed. Remove lint switch cover and dis
