ADC AD-464 Service Manual
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ADC AD-464 Service Manual

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AD-464 Service Manual
American Dryer Corporation
88 Currant Road
Fall River, MA 02720-4781
Telephone: (508) 678-9000 / Fax: (508) 678-9447
e-mail: techsupport@amdry.com
020399DMG/abe
ADC Part No. 450186

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  • Page 1 AD-464 Service Manual American Dryer Corporation 88 Currant Road Fall River, MA 02720-4781 Telephone: (508) 678-9000 / Fax: (508) 678-9447 e-mail: techsupport@amdry.com 020399DMG/abe ADC Part No. 450186...
  • Page 2 We have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the right to make changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change or discontinue models.

  • Page 3: For Your Safety

    YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and THE GAS SUPPLY or THE STEAM SUPPLY BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUST- ING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS.
  • Page 4 The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT. DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED. PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or specified in the installation and operator's manual included with the dryer.

  • Page 5: Table Of Contents

    Table of Contents SECTION I SAFETY PRECAUTIONS ... 3 SECTION II ROUTINE MAINTENANCE ... 5 A. Cleaning ... 5 B. Lubrication ... 7 C. Adjustments ... 8 SECTION III SPECIFICATIONS ... 9 A. Gas Models (ADG-464) ... 9 B. Steam Models (ADS-464) ... 10 C.
  • Page 6 SECTION VIII SPRINKLER SYSTEM ... 81 A. Sprinkler System Description ... 81 SECTION IX AIR JET SYSTEM ... 85 A. Air Jet System ... 85 SECTION X STACK VALVE ASSEMBLY ... 86 A. Pneumatic Valve ... 86 SECTION XI PENDANT ASSEMBLY ... 91 A.

  • Page 7: Safety Precautions

    4. Installation and service must be performed by a qualified installer, service agency, or gas supplier. 5. Dryer(s) must be exhausted to the outdoors. 6. Although ADC produces a very versatile machine, there are some articles that, due to fabric composition or cleaning method, should not be dried in it.
  • Page 8 WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvent will create a fire hazard. WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or similarly textured rubberlike materials. Drying in a heated basket (tumbler) may damage plastics or rubber and also may be a fire hazard.

  • Page 9: Routine Maintenance

    Maximum operating efficiency is dependent upon proper air circulation. The accumulation of lint can restrict this air flow. If the guidelines in this section are met, an ADC dryer will provide many years of efficient, trouble-free, and - most importantly - safe operation.
  • Page 10 MONTHLY Empty the compressed air filter bowl. Clean any lint accumulation from the gas valve and burner area at the top of the dryer, the fan (impellor/ blower) motor, and the fan (impellor) bearings located in the dryer base. EVERY 6 MONTHS STEAM MODELS - clean the steam coil fins.

  • Page 11: Lubrication

    B. LUBRICATION MONTHLY Check compressed air filter bowl for water. Empty by pressing the rubber petcock to the side. Additionally, check lubricator bowl for oil. If empty, remove the fill plug and add oil. (Use petroleum based 10/150 SSU misting oil.) Replace the fill plug. NOTE: LUBRICATOR SHOULD BE SET AT 1 DROP PER CYCLE.

  • Page 12: Adjustments

    EVERY 6 MONTHS Change gear oil in the tumbler shaft gear reducer. 1. Remove the drain plug (located at the bottom rear of the reducer). 2. After oil is completely drained replace the drain plug. 3. Remove the vent plug and pour in 1.4 liters of Mobil Oil DTE HH5G (I.S.O. viscosity grade 460), SAE 90, or equivalent.

  • Page 13: Specifications

    * Gas pressure into the dryer cannot exceed 13" W.C. (water column). If the gas supply pressure is higher than 13" W.C., an external regulator must be installed. NOTE: ADC reserves the right to make changes in specifications at any time, without notice or obligation.

  • Page 14: Steam Models (Ads-464)

    Sh aded areas ar e s tated in metr ic equivalen ts * Size of piping to dryer varies with installation conditions. Contact factory for assistance. NOTE: ADC reserves the right to make changes in specifications at any time, without notice or obligation.

  • Page 15: Electrical Service Specifications

    Contact factory for information not listed. ** Minimum wire size is #16 AWG Stranded Type Wire...for individual lengths less than 100 feet. NOTE: ADC reserves the right to make changes in specifications at any time, without notice or obligation. ADG-464 (G...

  • Page 16: Installation Requirements

    Also, allowances should be made in the rear for ease of maintenance. Refer to the Part No. 112193) for Gas Model dryers and ADS-464 Installation/Operator's Manual (ADC Part No. 112103) for Steam Model dryers for recommended distances and minimum allowances required.

  • Page 17: Electrical And Gas Requirements

    B. ELECTRICAL REQUIREMENTS and GAS REQUIREMENTS It is your responsibility to have ALL electrical connections made by a properly licensed and competent electrician to assure that the electrical installation is adequate and conforms with local and state regulations or codes. In the absence of such codes, ALL electrical connections, material, and workmanship must conform to the applicable requirements of the National Electric Code ANSI/NFPA No.

  • Page 18: Component Description/Replacement

    COMPONENT DESCRIPTION/REPLACEMENT A. TUMBLER SUPPORT and DRIVE SYSTEM IMPORTANT: Always keep the tumbler (basket) section of the dryer in an upright position when moving it. 1. Tumbler The tumbler is made of five (5) 14 gauge stainless steel perforated panels, five (5) stainless steel lifting ribs, and two (2) outer tumbler rings.
  • Page 19 3. Tumbler and Basket Drive System There are two (2) 5 HP tumbler drive motors. Each motor drives one of the 2-inch diameter tumbler drive shafts, and the motors spin simultaneously so that ALL four (4) sets drive wheels work together to spin the tumbler.

  • Page 20: Main Air Blower/Heat Reclaimer System

    B. MAIN AIR BLOWER/HEAT RECLAIMER SYSTEM The fan which moves the exhaust air through the dryer is a 22-inch diameter, squirrel cage fan that is driven at 1,100 rpm by a 25 HP motor. This fan moves a maximum of 13,000 cfm air through the dryer.
  • Page 21 The dryer is equipped with a pneumatically operated heat reclaimer damper, which when opened, will recirculate approximately fifteen percent (15%) of the dryer’s exhaust air. The heat reclaimer dampener is closed until ignition of flame has been established. Then, the damper piston is actuated, opening the damper and recirculating fifteen percent (15%) of the exhaust air back over the gas burner and into the tumbler.

  • Page 22: Compressed Air System

    C. COMPRESSED AIR SYSTEM The compressed air system of the dryer consists of a number of pneumatic pistons located throughout the dryer, an FRL (Filter/Regulator/Lubricator) assembly, and pneumatic control panel. 1. Air Pistons The pistons are actuated by solenoid and flow control valves that are under computer control. The pneumatic pistons are used to: •...
  • Page 23 b. Regulator Operation The adjustment knob simply acts upon a spring rest located on the spring and directly compresses the spring as it is adjusted. A non-rising low torque adjustment screw is used on this type of filter and regulator. The upper spring rest is located on top of the regulator spring and transmits force from the adjustment screw to the spring.
  • Page 24 To tilt the dryer back, a 120 volt signal is applied to the front pistons solenoid connector #S5, and no voltage is applied to the solenoid connector #S8. The internal spool in the valve will move and 80 PSI of air will enter the bottom port of the front tilting pistons, extending the front tilting piston rods and tilting the dryer back for loading.
  • Page 25 To open the front loading door, a 120 volt signal is applied to S1, the coil of the valve that supplies air to the load door or the heat reclaimer’s bottom port. The valve will open, and 80 PSI of air is supplied to the bottom port of the piston.

  • Page 26: Safety Devices

    D. SAFETY DEVICES The dryer is equipped with numerous safety devices to ensure that the dryer operates safely. The chart on the following page (page 23) lists each device with its location, function, computer display message, and result of tripping.
  • Page 27 1. Safety Devices Locations/Functions/Messages AFETY EVICES OCATION Left side of Load Door Switch Load door Unload door switch (Two Right side of door unit only) unload door Top left side of Tilting Switches base module Left side of Drum Rotation Sensor tumbler section Lint Chamber air pressure Rear of base...

  • Page 28: Blower (Squirrel Cage Fan) Motor Assembly

    E. BLOWER (Squirrel Cage Fan) MOTOR ASSEMBLY 1. Blower (Squirrel Cage Fan) Motor Description The dryer uses a 22-1/4 inch diameter blower (squirrel cage fan). It rotates (spins) in a counterclockwise (CCW) direction, when viewed at the blower motor. The blower shaft is mounted on two (2) 1-3/4 inch diameter pillow block bearings and is driven by two (2) BX type V-belts which are connected to a 25 HP blower motor.
  • Page 29 5) Remove the bolts from the bushing. 6) Insert the bolts into the threaded holes. 7) Tighten the bolts evenly for motor pulley removal. 8) Mark the inside of the motors' shaft before removing the bushing. 9) Loosen the set screws in the bushing. 10) Remove the bushing.
  • Page 30 b. Shrouded Pillow Block Bearing Replacement 1) Discontinue electrical service to the dryer. 2) Remove the belt guard. 3) Loosen the bolts securing the blower motor to the motor base. 4) Remove the V-belts from the motor pulley and the pulley on the blower shaft. CAUTION: THE BLOWER (Squirrel Cage) FAN IS LOCATED IN THE LINT COMPARTMENT.
  • Page 31 15) Replace the shrouded pillow block bearing on the blower shaft... a) Secure the blower shaft to the blower shaft bearing mount. b) Tighten/secure the set screws in the shrouded pillow block bearing. NOTE: Install the 3/8" x 3/8" x 3" key on to the blower shaft before installing the fan).
  • Page 32 5) Remove the two (2) left hand jam nuts and the washers. 6) Remove the blower (squirrel cage fan) along with the 3/8" x 3/8" x 3" key from the blower shaft. NOTE: Install the 3/8" x 3/8" x 3" key on to the blower shaft before installing the fan).

  • Page 33: Blower (Squirrel Cage Fan) Electrical Components

    F. BLOWER (Squirrel Cage Fan) ELECTRICAL COMPONENTS 1. Blower (Squirrel Cage Fan) Controls and Overloads a) Thermal Magnetic Starter (TMS) Description The thermal magnetic starter (TMS) is used as a safety device to manually disconnect the motor, thereby protecting the motor from being damaged in a locked rotor condition. The overload has a dial setting on the face of the device.
  • Page 34 2. Auxiliary Contact Block Description The auxiliary contact block is mounted on the side of the overload. Its' function is to sense an overload trip, thereby triggering a safety fault which will disable the drying cycle. A motor fault message will appear on the display of the Telemecanique XBT unit.

  • Page 35: Tumbler (Basket) System

    G. TUMBLER (Basket) SYSTEM 1. Tumbler (Basket) Drive Description The tumbler (basket) is supported and driven by four (4) 11-inch diameter heavy duty rubber roller wheels. The rubber wheels are molded onto each of four (4) steel hubs. The steel hubs are fastened to the 2-inch diameter tumbler drive shafts by taper lock bushings.
  • Page 36 2. Tumbler (Basket) Drive System Replacement a. Tumbler (Basket) Drive Wheel Replacement 1) Discontinue electrical service to the dryer. 2) Disconnect air supply to the dryer. 3) Remove front panels or rear panels that are secured to the front or rear tumbler section of the dryer by removing the access bolts.
  • Page 37 16) Remove the taper lock bushing. 17) Remove the drive wheel. 13) Tighten the bolts evenly for wheel removal. 18) To install new drive wheel, reverse Step #17 thru Step #3. 19) Reconnect air supply disconnected in Step #2. 20) Reestablish electrical power to the dryer. b.
  • Page 38 14 Check that the motor pulley is properly aligned. 15) Secure the drive motor to the motor mount. 16) Tighten the turnbuckle. IMPORTANT: DO NOT OVERTIGHTEN TURNBUCKLE. 17) Rewire the new drive motor in the same sequence as the wiring that was removed in Step #2. A wiring diagram is usually affixed to the side of the motor.
  • Page 39 10) Insert bolts into the holes of the taper lock bushing and thread into the motor pulley, then tighten evenly. 11) Check that the motor pulley is properly aligned. 16) Reinstall the V-belts removed in Step #2. 17) Tighten the turnbuckle. IMPORTANT: DO NOT OVERTIGHTEN TURNBUCKLE.
  • Page 40 CAUTION: Replacement gear (speed) reducers are shipped without oil. Add proper amount (1.4 liters) of recommended lubricant before operating. FAILURE TO OBSERVE THESE PRECAUTIONS WILL RESULT IN DAMAGE TO THE DRYER AND WILL VOID THE WARRANTY. CAUTION: TO MUCH OIL IN THE GEAR REDUCER WILL CAUSE OVERHEATING and TOO LITTLE OIL WILL RESULT IN GEAR FAILURE.
  • Page 41 17) Reinstall V-belts and tighten the turnbuckle. IMPORTANT: DO NOT OVERTIGHTEN TURNBUCKLE. 18) Prior to operating the new gear (speed) reducer, fill with 1.4 liters of SAE 90 gear oil. 19) Mount the pillow block bearing on the mounting pads (using the bolts that were removed). IMPORTANT: DO NOT OVERTIGHTEN BOLTS.
  • Page 42 WARNING: ALL SERVICE and TROUBLESHOOTING SHOULD BE PREFORMED BY A QUALIFIED PROFESSIONAL or SERVICE AGENT. WARNING: WHILE MAKING ADJUSTMENTS, OBSERVE ALL SAFETY PRECAUTIONS DISPLAYED ON THE DRYER or SPECIFIED IN THIS MANUAL. 6) Reestablish electrical service to the dryer. Proceed to Retaining Wheel Adjustment instructions immediately below. h.

  • Page 43: Rotational Sensor Assembly

    H. ROTATIONAL SENSOR ASSEMBLY The rotational sensor is a self-contained, motion detector proximity sensor, designed to detect a predetermined stopped drum (basket/tumbler) condition. The rotational sensor is used as a safety device, once the drum has stopped rotating for more than 12-seconds. After this 12-second interval has been reached, the sensor goes into an open state, removing power to PLC (Programmable Logic Controller) input #10.
  • Page 44 (1) Rotational Sensor Adjustment Distance Adjustment; • Pull the rotational sensor as far away from the basket (tumbler) as possible. • Spin/rotate the basket (tumbler) until the target (target lines up behind one of the basket ribs) is aligned with the rotational sensor. Mark basket (tumbler) rib with tape.

  • Page 45: Top Of Tumbler (Basket) Temperature Door Assembly

    I. TOP OF TUMBLER (Basket) TEMPERATURE DOOR ASSEMBLY 1. Intake Temperature Probe/Sprinkler Temperature Probe The intake temperature probe and sprinkler temperature probe are 100 ohm (100 ) Resistive Temperature Device (RTD) probes located on the top of the tumbler (basket) section of the dryer. The intake temperature probe measures the intake temperature of the dryer and is monitored by the hi-temperature controller.

  • Page 46: Tumbler (Basket) Electrical Components

    J. TUMBLER (Basket) ELECTRICAL COMPONENTS 1. Drive Motor Controls and Overloads a) Thermal Magnetic Starter (TMS) Description The thermal magnetic starter (TMS) is used as a safety device to manually disconnect the motor, thereby protecting the motor from being damaged in a locked rotor condition. The overload has a dial setting on the face of the device.
  • Page 47 2. Auxiliary Contact Block Description The auxiliary contact block is mounted on the side of the overload. Its' function is to sense an overload trip, thereby triggering a safety fault which will disable the drying cycle. A motor fault message will appear on the display of the Telemecanique XBT unit.

  • Page 48: Plc (Programmable Logic Controller) System

    PLC (PROGRAMMABLE LOGIC CONTROLLER) SYSTEM A. PLC (Programmable Logic Controller) DESCRIPTION The heart of the dryer is a TSX17 PLC (Programmable Logic Controller) with twenty-one (21) inputs and twelve (12) outputs. The TSX17 PLC also uses two (2) expansion modules, a relay output module with six (6) outputs, and a 4 mA - 20 mA (milliamphere) analog input module with four (4) inputs.
  • Page 49 • Input 0,9 is used to sense if the burner doors are closed. This is accomplished through DS4A and DS5A (Door Switch 4, A and Door Switch 5 , A) contact sets. If a drying cycle is attempted, the XBT unit will display "DOOR OPEN."...
  • Page 50 The main module of the TSX17 PLC (Programmable Logic Controller) also has eleven (11) outputs to control various functions of the dryer. The outputs are relay contacts, whereby each of the relays have a common terminal tied to 110 VAC. •...
  • Page 51 • Output 1,4 is the blower (fan) Air Jet which is used to clean lint off of the fan (blower). At the end of a cycle, the Air Jet turns on for 30-seconds. • Output 1,5 is the End of Cycle light. Once the dryer has reached the end of a cycle, the output turns on, illuminating the End of Cycle light.

  • Page 52: Plc (Programmable Logic Controller) Component Replacement

    B. PLC (Programmable Logic Controller) COMPONENT REPLACEMENT 1. TSX17 PLC (Programmable Logic Controller) Assembly The TSX17 Programmable Logic Controller (PLC) is made up of three (3) components. The first and main component is the TSX17 PLC, then the Relay Outputs, and the Analog Inputs. The TSX17 PLC has a ram back-up lithium battery.
  • Page 53 3. Lithium Battery a. Lithium Battery Replacement 1) Discontinue electrical service to the dryer. 2) Remove the battery cover which is located directly above the buss terminator on the TSX17 PLC (Programmable Logic Controller) by sliding the cover in an upward direction. NOTE: The lithium battery is attached to the cover and plugged into the module.
  • Page 54 4. Under Voltage Disconnect The dryer uses a 110 VAC under voltage disconnect. This 110 VAC is supplied from the sprinkler circuit. The sprinkler circuit is part of the safety circuit of the dryer. If the sprinkler circuit is in an alarm condition, the 110 VAC supply to the under voltage disconnect will become discontinued, shutting down the dryer.
  • Page 55 5. Hi-Limit Controller The dryer utilizes six (6) channel controller (HLC-1) to monitor various locations on the dryer for over temperature faults. The hi-limit controller enables the dryer to continually monitor up to six (6) Resistive Temperature Devices (RTD's) at one time. Each channel is individual with set points. The hi-limit controller scans each channel, and in the event of an alarm, the scanning will halt (stop), and the Single-Pole-Double- Throw (SPDT) will change states signaling a fault.
  • Page 56 6. Gas Burner and Ignition System The dryer's gas burner system operates on a on or off gas rate sequences to accurately control the tumbler’s (basket's) drying temperature. Maximum firing rate is 2.8 million btu/hr. Upon a call from heat, the dryer computer sends a 120 volt signal to the burner controller module (BCM) which initiates and controls the ignition sequences.
  • Page 57 35-seconds after ignition. If this switch is “OFF," the burner will lock out at once. This switch is “ON” for intermittent pilot or “OFF” for interrupted pilot. ADC utilizes intermit tent pilot so that the pilot flame stays lit during the entire drying cycle. With interrupted pilot, the pilot flame would go out once the main flame is established.
  • Page 58 b. L.E.D. (Light Emitting Diode) and Neon Displays of the BCM (Burner Controller Module) 1) Operating Interlock - L.E.D. is lit when; ALL safety interlock switches are closed, applying a 110 VAC signal to terminal #7 of the burner controller module (BCM). 2) Operating Interlock - L.E.D.
  • Page 59 8) Burner Fan Air Switch Status Indicator - Neon is not lit; • Air switch is not closed after start-up of burner fan. • Door interlocks are open. • A Combustion burner screen is clogged. • A door on the dryer is open. 9) Test/Reset Button When this button is pushed in, the burner controller module (BCM) will halt the ignition sequence, once the pilot flame is established.
  • Page 60 1) Burner Fan Air Switch The differential in air pressure is measured by the burner fan air switch, which is located next to the burner fan motor. If the combustion air is inadequate, this switch will prevent ignition. The setting of this switch is adjustable, and it should be set at approximately .59-inches (15 mm) of water column (W.C.) because of slight variances in spring tension characteristics, range settings, and markings are nominal.
  • Page 61 4) Combustion Air Damper To produce the required combustion airflow, this damper can be adjusted. Remove the screen to get access to the damper. Moving the damper closer to the blower inlet opening will reduce the combustion airflow, and moving it away from the blower inlet opening will increase the airflow. To measure the combustion airflow, attached a manometer to the air pressure tap on the burner box.
  • Page 62 Top Motorized Gas Valve The valve sets the gas rate of 2,800,000 btu/hr (705,290 kcal/hr). To achieve this rate, the gas pressure must be set for 2.5-inches (63.5 mm) water column for natural gas and 1.25-inches (31.8 mm) water column for L.P. (liquid propane) gas. To adjust. loosen the pan head screw located on the front of the top motorized valve, while holding the valve body, turn the flow adjustment clockwise (CW) for less gas and counterclockwise (CCW) for more gas.
  • Page 63 c) The burner controller module (BCM) checks that ALL of the dryer’s safety circuits are closed (terminal #7 of the [BCM]). If this is the case, then the green “operating interlocks” L.E.D. (light emitting diode) on the BCM will light. If a safety switch is open, the green L.E.D. will not light, and the red “SYSTEM UNSAFE”...
  • Page 64 (5) If signal is less than 3 volts DC, then the pilot may be too small or too large, there may be a wiring connection between the flame rod and burner controller module (BCM), the flame rod may be dirty, (wash it with soap and water) or defective, or the grounding may be faulty. Once the flame probe signal is detected by the BCM, it waits 5-seconds to allow the pilot to stabilize and then opens the main motorized gas valves (terminal #5 on the BCM) in sequence.
  • Page 65 h. Burner Air Switch The dryer uses a burner air switch on its burner components. The differential air pressure is measured by this air switch, which is located next to the burner fan motor. If the combustion air is inadequate, this switch will prevent ignition.
  • Page 66 i. Burner Squirrel Cage Fan Components The combustion air is produced by a 6-1/4" squirrel cage fan, attached to a 1-1/2 HP, 3,600 RPM motor. This motor must spin counterclockwise (CCW) as viewed from the rear of the motor. 1) Burner Fan Motor a) Burner Fan Motor Replacement (1) Discontinue electrical service to the dryer.
  • Page 67 (3) For replacement of new 6-1/4" squirrel cage fan, reverse Step #4 thru Step #2 of the Burner Fan Motor Replacement instructions on the previous page (page 62). (4) Reestablish electrical service to the dryer. 3) Burner Fan Electrical Components a) Burner Fan Thermal Magnetic Starter (TMS) The thermal magnet starter (TMS) is used as a safety device to manually disconnect the motor so that it will be protected from damage in the event of a locked rotor condition.
  • Page 68 (5) To install the new auxiliary contact block, reverse Step #4 thru Step #2. (6) Reestablish electrical service to the dryer. (3) Varistor (Metal Oxide Varistor [MOV]) The metal oxide varistor (MOV) is used to suppress any inductive electrical spikes produced by the energizing and collapsing of coil voltage.
  • Page 69 b) Burner Door Switch Replacement 1) Discontinue electrical service to the dryer. 2) Loosen the 1/4-20 x 3/4" hex head machine bolts as well as the 1/4-20 hex nut. 3) Remove the four (4) Phillips head screws securing the burner switch cover plate to the switch body.
  • Page 71 Heat Reclaimer - the dryer is equipped with a pneumatically operated heat reclaimer, which when open, will recirculate approximately fifteen percent (15%) of the dryers' exhausted air. The heat reclaimer damper is closed until ignition of flame has been established. a.
  • Page 72 3) Adjust the bottom heat reclaimer nuts down to their desired positions to obtain the proper piston stroke. Example: If the desired piston stroke is 2-inches (5.1 cm), then the distance "X" in the illustration below must be 2-inches (5.1 cm). 4) Tighten the top heat reclaimer nuts down onto the bottom heat reclaimer nuts.
  • Page 73 b. Cool Down Damper Piston Replacement 1) Discontinue electrical service to the dryer. 2) Discontinue the air supply to the dryer. 3) Remove the two (2) 1/4" poly x 1/4" M.P.T. connectors from the piston. 4) Loosen the 1/4-20 x 3/8" set screw from the clevis and remove the clevis pin. 5) Remove the piston from the damper cylinder mounting plate.
  • Page 74 b. Cable (Wire Rope) Replacement 1) Discontinue electrical service to the dryer. 2) Discontinue the air supply to the dryer. 3) Block the bottom load door in the closed position prior to disassembly of any parts. IMPORTANT: FAILURE TO BLOCK THE BOTTOM LOAD DOOR SECURELY IN THE CLOSED POSITION MAY RESULT IN PERSONAL INJURY.
  • Page 75 ALL foreign residue. 3) Carefully clean new door glass with alcohol prior to installation. 4) Apply a bead of silicone (ADC Part No. 170730) to the outer perimeter of the door glass opening. 5) Carefully insert new door glass within the door glass opening.
  • Page 76 d. Load Door Closed Switch Replacement 1) Discontinue electrical service to the dryer. 2) Loosen and remove the two (2) screws securing the junction cover. 3) Remove the junction cover. 4) Mark and identify the wires that will be removed for proper reinstallation. 5) Remove the wires from the terminals.
  • Page 77 e. Load Door Closed Switch Adjustment 1) Discontinue electrical service to the dryer. 2) To adjust the coil spring lever arm, hold the arm with a #10 metric (10 mm) wrench and loosen the nut. 3) Place the coil spring lever arm in the 1 o'clock position. IMPORTANT: Verify that the will result.
  • Page 78 5) With finger tip, gently push and turn bulb to unlock. NOTE: A piece of tubing with an inside diameter the size of the bulb may assist in bulb removal and replacement. 6) To install new bulb, reverse Step #5 thru Step #2. (Refer to previous page [page 73].) 7) Reestablish electrical service to the dryer.
  • Page 79 11) Place pivot arm in the 1 o'clock position for the front tilt switch and in the 11 o'clock position for the rear tilt switch. Verify that the body orientation and head orientation are correct. Verify that the tilt switch arm is not in the vertical position or damage will result. 12) Holding the tilt arm, tighten up (snug up) on the nut.

  • Page 80: Base Section

    A. LINT DRAWER/LINT CHAMBER SWITCHES 1. Lint Drawer Switches The dryer utilizes two (2) magnetic proximity switches (wired in series) to indicate a lint drawer closed status. The magnetic proximity switch is a device whereby the contacts within the device close when it comes in to close proximity of a magnetic field.
  • Page 81 2. Lint Chamber Air Pressure Switch The lint chamber air pressure switch utilized in the dryer is used to insure that there is proper air flow through the dryer. If there is a problem with this air pressure switch an "AIR FAULT" error message will be displayed via the L.E.D.
  • Page 82 c. Lint Chamber Air Switch Replacement 1) Discontinue electrical service to the dryer. 2) Remove the 1/4" x 1/8" M.P.T. straight connector. 3) Remove the 5/16-18 x 3/4" tap bolt, as well as the 5/16" lock washer. 4) Mark and identify the wires that will be removed for proper reinstallation. 5) Remove the cord grip from the lint chamber air switch.

  • Page 83: Resistive Temperature Device

    B. RESISTIVE TEMPERATURE DEVICE (RTD) 1. RTD (Resistive Temperature Device) The gas dryer utilizes five (5) Resistive Temperature Devices (RTD's); • One (1) RTD probe is used to control the drying temperature in the tumbler (basket). • One (1) RTD probe is used to detect an over temperature condition in the dryers' intake. •...
  • Page 84 2. RTD (Resistive Temperature Device) Locations NTAKE IMIT PRINKLER URNER IMIT MAN4146 XHAUST EMPERATURE XHAUST IMIT...

  • Page 85: Section Viii

    A. SPRINKLER SYSTEM DESCRIPTION The sprinkler circuit on the dryer requires a dedicated single-phase (1ø) supply from the dryers' voltage. The sprinkler hi-limit temperature is 700º F (371.11º C). In the event of a hi-limit condition, contact #7 and contact #8 on the sprinkler controller will open, disabling the 120 volt supply to the under voltage disconnect.
  • Page 86 d. Sprinkler Digital Temperature Controller The sprinkler digital temperature controller is a programmable microprocessor (computer). It is used to monitor temperature via a Resistive Temperature Device (RTD). NOTE: Operating parameters are preset at the factory and should not require any adjustment.
  • Page 87 2. Sprinkler System Component Replacement a. Resistive Temperature Device (RTD) Replacement The sprinkler digital temperature controller is a programmable microprocessor (computer). It is used to monitor temperature via a Resistive Temperature Device (RTD). NOTE: For RTD (Resistive Temperature Device) probe location, refer to the top illustration on page 80. 1) Discontinue water supply to the dryers' sprinkler system.

  • Page 89: Air Jet System

    A. AIR JET SYSTEM The dryer utilizes an air jet system so that at the end of each drying cycle 80 PSI of compressed air is blown across the blower squirrel cage fan to remove any lint build up that occurred during the drying cycle. 1.

  • Page 90: Stack Valve Assembly

    STACK VALVE ASSEMBLY A. PNEUMATIC VALVE The stack valve assembly consists of two (2) styles of pneumatic solenoids; • The first type of solenoid is a 2-position/4-way/4-port single operator with a spring return. This valve has a 120 VAC coil and spring return. With no power to the coil, air goes out of the B port and the A port gets exhausted.
  • Page 91 1. Solenoid Coil a. Coil Replacement 1) Discontinue air supply to the dryer. 2) Discontinue electrical service to the dryer. 3) For models with a sprinkler system, discontinue water supply to the dryers' sprinkler system. 4) Loosen coil plug screw and remove the plug. 5) Carefully remove the coil mounting screw.
  • Page 92 2. Solenoid Valve a. Valve Replacement 1) Discontinue air supply to the dryer. 2) Discontinue electrical service to the dryer. 3) For models with a sprinkler system, discontinue water supply to the dryers' sprinkler system. 4) Loosen coil plug screw and remove the plug. 5) Carefully remove the two (2) valve mounting screws.
  • Page 93 MAN4223...
  • Page 94 4. Internal Pilot and External Pilot Air Supply On two-way tilt dryers, a pneumatic safety circuit is incorporated to prevent both front and rear tilting pistons from extending their rods at the same time. When 120 volts is supplied to the “S5” side of the front tilting piston solenoid valve coil, the round internal spool in the core of the solenoid will move, allowing 80 PSI air to flow into the bottom ports of the front tilting pistons, while the top ports of these pistons are bled to the atmosphere.

  • Page 95: Pendant Assembly

    A. PENDANT ASSEMBLY DESCRIPTION The pendant assembly is used on both the gas and steam model dryer. Within the pendant assembly there is a three (3) position selection switch used to tilt the dryer in the load tilted, unload tilted, or level position. When the load tilted or unload tilted selection is made, the load/unload door will open once the door signal has been received, and the dryer will tilt.
  • Page 96 ADC 450186 1- 05/27/99-25 2- 01/14/00-15...

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