ADC AD-170 (01) PDF Document

DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance for the ADC AD-170.

The purchaser/user of the ADC AD-170 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 location.

The ADC AD-170 dryer must be exhausted to the outdoors.

Although ADC’s dryer is a very versatile machine, there are some articles, that due to fabric composition or cleaning method, should not be dried in it.

WARNING: Dry only water-washed fabrics. DO NOT dry articles spotted or washed in dry cleaning solvents, a combustible detergent, or “All-Purpose” cleaners. Fire or explosion could result with the ADC AD-170.

WARNING: DO NOT dry rags or articles coated with gasoline, kerosene, paint, or wax. Fire or explosion could result with the ADC AD-170.

WARNING: DO NOT dry mopheads in the ADC AD-170. Contamination by wax or flammable solvents will create a fire hazard.

WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or similarly textured rubberlike materials in the ADC AD-170. Drying in a heated tumbler may damage plastic or rubber and also may be a fire hazard.

A program should be established for the inspection and cleaning of lint in the burner area and exhaust duct work for the ADC AD-170. The frequency of cleaning can best be determined from experience at each location.

WARNING: The collection of lint in the burner area and exhaust duct work can create a potential fire hazard with the ADC AD-170.

For personal safety, the ADC AD-170 dryer must be electrically grounded in accordance with local codes and/or the National Electric Code ANSI/NFPA No. 70-LATEST EDITION.

Under no circumstances should the dryer door or lint drawer switch(es) or heat safety devices ever be disabled on the ADC AD-170.

Read and follow ALL caution and direction labels attached to the ADC AD-170 dryer.

WARNING: CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR IN THE DRYER(S). CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN OPERATION of the ADC AD-170.

The ADC AD-170 dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJURY or FIRE COULD RESULT.

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, ADJUSTING, INSTALLATION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) STANDARDS for the ADC AD-170.

Dryer(s) must not be installed or stored in an area where it will be exposed to water and/or weather for the ADC AD-170.

WARNING: LINT FROM MOST FABRICS IS HIGHLY COMBUSTIBLE. THE ACCUMULATION OF LINT CAN CREATE A POTENTIAL FIRE HAZARD in the ADC AD-170.

The suggested interval and function for cleaning the ADC AD-170 are as follows:

WARNING: To avoid the hazard of electrical shock, discontinue electrical supply to dryer for the ADC AD-170.

IMPORTANT: Lint accumulation will restrict internal motor air flow, causing overheating and irreparable damage. Motor failure due to lint accumulation will VOID THE MANUFACTURER’S WARRANTY for the ADC AD-170.

For cleaning and care of the cabinet for the ADC AD-170, avoid using harsh abrasives. A product intended for the cleaning of appliances is recommended.

At 6 MONTHS intervals for the ADC AD-170, Inspect and remove lint accumulation in customer-furnished exhaust duct work system. Inspect exhaust back draft dampers to insure they are not binding. Inspect and remove ALL lint accumulation from in and around control box area, including coin acceptors. Clean lint accumulation from around tumbler wrapper area.

WARNING: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN CREATE A POTENTIAL FIRE HAZARD for the ADC AD-170.

The suggested interval and function for adjustments on the ADC AD-170 are as follows:

Lubrication is necessary on the fan bearings (2) 50 & 60Hz steam models, and 50Hz gas models ONLY for the ADC AD-170. This should be performed every 90 days.

Bulkheads and partitions around the ADC AD-170 dryer should be made of noncombustible materials.

Allowances should be made for the opening and closing of the control door and lint door for the ADC AD-170.

Allowances should be made in the rear for ease of maintenance for the ADC AD-170. (Refer to appropriate Installation Manual for recommended distances and minimum allowances required.)

When the ADC AD-170 dryer is operating, it draws in room air, heats it, passes this air through the basket (tumbler), and exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors.

If the make-up air for the ADC AD-170 is inadequate, drying time and drying efficiency will be adversely affected. Ignition problems and sail switch “fluttering” problems on gas dryers may result, and you also could have premature motor failure from overheating. The air supply must be given careful consideration to insure proper performance of each dryer.

IMPORTANT: Make-up air must be provided from a source free of dry cleaning fumes for the ADC AD-170. Make-up air that is contaminated by dry cleaning fumes will result in irreparable damage to motors and other dryer components.

Exhaust duct work for the ADC AD-170 should be designed and installed by a competent technician.

Improperly sized duct work for the ADC AD-170 will create excessive back pressure which will result in slow drying, increased use of energy, and shutdown of the burner by the airflow (sail) switch, burner hi-limit or lint chamber hi-heat protector thermostat. (Refer to appropriate Installation Manual for more detail.)

CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCT WORK CAN CREATE A POTENTIAL FIRE HAZARD for the ADC AD-170.

ALL electrical connections for the ADC AD-170 must be 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. 70-LATEST EDITION.

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 for the ADC AD-170.

The ADC AD-170 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 for the ADC AD-170.

The ADC AD-170 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 ADC AD-170 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.

NOTE: Any burner changes for the ADC AD-170 must be made by a qualified technician.

After performing any service or maintenance function for the ADC AD-170, an operational check should be performed to insure that ALL components are performing properly.

Step 1. Make a complete operational check of ALL the operating controls to insure that the timing is correct, temperature selection switches are functioning properly.

Step 2. Make a complete operational check of ALL safety related circuits, door switch(es), hi-limit thermostat, sail switch, cycling thermostats, etc. for the ADC AD-170.

To replace the computer on the ADC AD-170:

1. Disconnect power to the dryer.
2. Disconnect main power harness from rear of computer by squeezing locking tab and pulling connector straight back.
3. Disconnect the green ground wire from the computer.
4. Disconnect keyboard ribbon from the computer.
5. Remove the two hex nuts securing the computer to the sheet metal control panel. Remove the board by pulling the other two corners off the clinch studs.
6. Install new computer by reversing this procedure.
7. When replacing the computer, the “A” and “B” factors must be reprogrammed. (see “Computer Operator’s Manual” for details).
8. Reestablish power to dryer.

NOTE: The “A” and “B” factors are printed on a label located on the rear of the control panel.

To replace the keyboard label assembly on the ADC AD-170:

1. Discontinue power to dryer.
2. Unplug keyboard ribbon from rear of computer.
3. Slowly peel off and remove keyboard label assembly from control panel.
4. Peel paper backing off new keyboard label assembly.
5. Holding the new keyboard label assembly close to the panel, insert the keyboard ribbon through the rectangular slot in the control panel. Align label assembly into position by matching the red viewing window on the label to the rectangular cutout in the panel and gently press into place.
6. Connect keyboard ribbon to the computer.
7. Reestablish power to dryer.

To replace the Microprocessor Temperature Sensor Probe on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove lint drawer. Remove two (2) screws securing lint door and remove lint door.
3. Remove microprocessor sensor bracket assembly from dryer.
   1. Disconnect sensor bracket harness connector.
   2. Loosen the two (2) Phillips head screws securing bracket assembly to dryer and remove bracket from dryer.
4. Disassemble sensor probe from bracket assembly by removing the top push-on fastener securing the probe from bracket. Use a small screwdriver to slowly pry the fastener off.
5. Disconnect the two (2) orange wires from the high heat (225 degree) thermostat, and remove modular bracket connector, wires, and probe from bracket assembly.
6. Install new sensor probe assembly (ADC P/N 880251) by reversing procedure.
7. Reestablish power to the dryer.

NOTE: DO NOT remove screws when disassembling the sensor probe from the bracket assembly.

NOTE: If, when power is reestablished, the computer display reads “dSFL”, check for a loose connection in the wiring for the ADC AD-170.

To remove the Spark Ignitor on gas models of the ADC AD-170 (see above burner illustration):

1. Discontinue power to dryer.
2. Disconnect HV connector and flame probe connection from ignitor.
3. Disassemble ignitor from burner by removing the two (2) self-tapping screws.
4. Reverse procedure for installing new ignitor/flame-probe.

NOTE: Before reestablishing power to dryer for the ADC AD-170, visually check the following:

A. The flame electrode, ignitor electrode, and ground rod are all on the same line axis.

B. There should be a 1/8″ gap (+/- 1/32″) between the ignitor electrode and ground rod.

C. Do not wrap the red HV wire and the flame electrode wire together. Improper operation may result. They may run alongside each other.

To replace the Gas Valve on the ADC AD-170 (see burner illustration on page 16):

1. Discontinue power to dryer.
2. Close shut-off valve(s) in gas supply line.
3. Disconnect gas valve wiring.
4. Break union connection before gas valve.
5. Loosen and remove screws (4) securing pipe brackets to burner.
6. Remove gas valve/manifold assembly from dryer.
7. Remove valve mounting bracket, manifold, and piping from gas valve.
8. Reverse procedure for installing new gas valve.

WARNING: Test ALL connections for leaks by brushing on a soapy water solution for the ADC AD-170. NEVER TEST FOR LEAKS WITH A FLAME.

NOTE: Identify location of each wire for correct reinstallation.

To replace the Main Burner Orifices on the ADC AD-170:

1. Refer to “To Replace Gas Valve” and follow steps 1 through 6.
2. Unscrew main burner orifices and replace.
3. Reversing the removal procedure for reinstalling.

NOTE: Use extreme care when removing and replacing orifices for the ADC AD-170. These orifices are made of brass and are easily damaged.

NOTE: Test ALL connections for leaks by brushing on a soapy water solution for the ADC AD-170. NEVER TEST FOR LEAKS WITH A FLAME.

To Test Gas Water Column (W.C.) Pressure for the ADC AD-170:

1. Connect water column test gauge connection to gas valve pressure tap (1/8″ NPT). This pressure tap is located on the outlet (manifold) side of the valve.
2. Start dryer. With burner on, the correct water column reading in inches would be:
   • Natural Gas – 3.5 to 4 Inches Water Column
   • L.P. Gas – 10.5 to 11 Inches Water Column

To Adjust Water Column Pressure (natural gas only) for the ADC AD-170, L.P. gas must be regulated at source:

1. Remove the slotted vent cap on the top of the valve.
2. Turn the slotted adjustment screw located on the top of the valve next to the terminals. Turn clockwise to increase manifold pressure and counterclockwise to decrease.

NOTE: Manometers are available from the factory by ordering ADC P/N 122804 for the ADC AD-170.

NOTE: If correct W.C. pressure cannot be achieved, problem may be due to an undersized gas supply line, a faulty or underrated gas meter, etc. for the ADC AD-170.

To convert the ADC AD-170 from Natural Gas to L.P. Gas (ALL dryers are sold as natural gas, unless otherwise specified at the time the dryer order was placed):

1. Refer to “Replace Gas Valve” and follow steps 1 through 6.
   1. For models with 1″ Robertshaw valve.
2. Remove the four (4) screw which secure the top cap assembly. This assembly contains the regulator adjustment screw and the terminal connections.
3. Replace the top cap assembly with the L.P. version.
4. Unscrew main burner orifices and replace with L.P. orifices.
5. Reverse the procedure for reinstalling valve assembly to the dryer.

NOTE: Use extreme care when removing and replacing orifices for the ADC AD-170. These orifices are made of brass and are easily damaged.

WARNING: Test ALL connections for leaks by brushing on a soapy water solution for the ADC AD-170. NEVER TEST FOR LEAKS WITH A FLAME.

NOTE: There is no regulator provided in an L.P. dryer for the ADC AD-170. The column pressure must be regulated at the source (L.P. tank) or an external regulator must be added to each dryer.

To replace the Burner Tubes on the ADC AD-170:

1. Refer to “Replace Gas Valve” and follow steps 1 through 6.
2. Remove four (4) screws securing manifold rest and remove rest.
3. Remove the screws securing the front flanges of the burner tubes to the burner tube rest.
4. Remove the screws securing the burner tube rest to the oven and remove this rest.
5. Remove screws securing the sight hole disk and burner box cover plate to the oven and remove both of these pieces.
6. Remove burner tubes by sliding them out.
7. Replace by reversing procedure.

WARNING: Test ALL connections for leaks by brushing on a soapy water solution for the ADC AD-170. NEVER TEST FOR LEAKS WITH A FLAME.

To replace the DSI Module on Gas Models of the ADC AD-170:

1. Discontinue power to the dryer.
2. Remove the wires connected to the terminal strip at the bottom of the module.
3. Remove the four (4) screws securing the module to the mounting bracket.
4. Replace module by reversing procedure.
5. Reestablish power to dryer.

To replace the Burner Hi-Limit Thermostat on Gas Models of the ADC AD-170:

IMPORTANT: Under no circumstances should heat circuit safety devices ever be disabled for the ADC AD-170.

1. Discontinue power to dryer.
2. Disconnect wires from hi-limit thermostat.
3. Remove screw, washer, and nut securing thermostat to the bracket. Remove thermostat.
4. Reverse procedure for installing new thermostat.
5. Reestablish power to dryer.

To replace the Lint Compartment Hi-Heat Protector (225 Degree) Thermostat on the ADC AD-170:

IMPORTANT: Under no circumstances should heat safety devices be disabled for the ADC AD-170.

1. Discontinue power to dryer.
2. Remove lint drawer. Remove two (2) screws securing lint door and remove lint door.
3. Locate sensor bracket assembly and loosen the two (2) Phillips head screws securing bracket assembly to the tumbler wrapper.
4. Remove bracket assembly by slightly sliding bracket towards the rear of the dryer and to the left.
5. Disconnect sensor bracket harness connector and remove bracket assembly from dryer.
6. Disconnect the two (2) orange wires from the thermostat.
7. Disassemble thermostat from bracket assembly by removing the two (2) mounting screws, washers, and nuts.
8. Reverse this procedure for installing a hi-heat protector thermostat for the ADC AD-170.
9. Reestablish power to the dryer.

NOTE: DO NOT remove the screws when loosening the sensor bracket assembly screws.

To replace the Sail Switch on Gas Models of the ADC AD-170:

1. Disconnect power to dryer.
2. Remove the two (2) screws which hold sail switch box cover to sail switch box.
3. Disconnect the two (2) wires from the switch.
4. Disassemble sail switch from mounting bracket by removing the two (2) screws securing switch in place.
5. Reverse this procedure for installing new sail switch. Adjust sail switch as described in the next section.

To adjust the Sail Switch for the ADC AD-170:

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 return to the burner wall. The sail switch should close to restart the burner ignition cycle. If the sail switch circuit does not operate as described, bend the actuator arm of the sail switch accordingly until proper operation is achieved. To check proper “open” position of sail switch, open main door, manually depress main door switch, and start dryer. With the main door open and the dryer operating, the sail switch should be open, and the burner should not come on.

CAUTION: DO NOT abort this switch by taping or screwing sail switch damper to burner. PERSONAL INJURY OR FIRE COULD RESULT with the ADC AD-170.

To replace the Main Door Switch on the ADC AD-170:

1. Discontinue power to dryer.
2. Open main door.
3. Remove the two (2) Phillips head screws holding the main door switch bracket assembly in place.
4. Remove door switch bracket from hinge block and disconnect wiring from switch.
5. Disassemble door switch bracket by removing locking adjustment nut. Remove second locking nut and assemble onto new door switch.
6. Reverse this procedure for installing new door switch.
7. Reestablish power to dryer.

To replace the Main Door Assembly on the ADC AD-170:

1. Remove screws holding main door to main door hinge pad.
2. Reverse this procedure for reinstalling new main door assembly.

IMPORTANT: Under no circumstances should the door switch be disabled for the ADC AD-170.

To install New Main Door Glass on the ADC AD-170:

1. Remove main door assembly from dryer (follow main door removal procedure).
2. Lay main door on flat surface with front of door face down.
3. Remove glass and clean all old sealant off main door. This area must be completely cleaned for correct bonding.
4. Apply a narrow bead of silicone (ADC P/N 170730) all around main door area where glass will rest.
5. Install glass onto door/adhesive and slightly press glass in place.
6. The door assembly should now be put in an area where it will not be disturbed for at least 24 hours. Depending on the conditions, the curing time of this adhesive is 24 to 36 hours.
7. After 24-hour curing period, install main door on dryer by reversing step 1.

IMPORTANT: DO NOT press hard or silicone thickness between the glass and door will be reduced, resulting in poor bonding for the ADC AD-170.

To replace the Front Panel on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove main door switch and bracket assembly.
3. Follow procedure for removal of main door assembly.
4. Open control (service) door.
5. Remove lint drawer and open lint door by removing two (2) screws.
6. Remove the twelve (12) Phillips head screws securing front panel to dryer.
7. Pull wires up through front panel door switch wire channel and gently remove front panel assembly.
8. Reverse this procedure for installing new front panel.
9. Reestablish power to dryer.

To replace the Main Door Hinge Pad on the ADC AD-170:

1. Discontinue power to dryer.
2. Follow procedure for removal of main door assembly.
3. Follow procedure for removal of front panel assembly.
4. Disassemble hinge pad from front panel by removing the Phillips head screws located on the back side of the front panel.
5. Reassemble by reversing removal procedure.
6. Reestablish power to dryer.

IMPORTANT: When removing hinge pad assembly from front panel, be careful not to damage main door switch wires for the ADC AD-170.

To replace the Tumbler Pulley on the ADC AD-170:

1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves.
2. Remove cap screws from the bushings.
3. Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. See figure “A”.
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure “B”. When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft.
6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the bushing.

IMPORTANT: Tighten screws evenly and progressively for the ADC AD-170. 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 30ft-lbs. 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 the Small Idler Pulley on the ADC AD-170:

1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves.
2. Remove cap screws from the bushings.
3. Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. See figure “A”.
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure “B”. When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft.
6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the bushing.

IMPORTANT: Tighten screws evenly and progressively for the ADC AD-170. 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 6 ft-lbs, 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 the Large Idler Pulley on the ADC AD-170:

1. Loosen V-belts. Then, rotate pulley and roll V-belts out of grooves.
2. Remove cap screws.
3. Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. See Figure “A” on previous page.
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure “B” on previous page. When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft.
6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the bushing.

IMPORTANT: Tighten screws evenly and progressively for the ADC AD-170. 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 6 ft-lbs. 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 the Motor Pulley on the ADC AD-170:

1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves.
2. Remove cap screws from bushing.
3. Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. See figure “A” on previous page.
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure “B”. When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft.
6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the bushing.

IMPORTANT: Tighten screws evenly and progressively for the ADC AD-170. 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 6 ft-lbs, 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 perform Basket Alignment (Vertical – Up and Down Adjustment) on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove background.
3. Loosen the two (2) vertical holding bolts on the side at the top of the bearing box (1 on each side).
4. Back off jam nuts on vertical adjustment bolts.
5. Turn these bolts clockwise evenly to raise basket or counterclockwise evenly to lower basket.
6. Rotate basket from front and check alignment with front door opening.
7. Leave a larger gap from the inside ring on the top of the front panel opening to the basket and a smaller gap on the bottom to compensate for the weight of the clothes when wet.
8. Retighten the two (2) vertical holding bolts on the sides, at the top of the bearing box, and the jam nuts on the two (2) vertical adjustment bolts.
9. Check basket drive belt for proper tension. Adjust if necessary.
10. Replace backguard.
11. Reestablish power to dryer.

To perform Basket Alignment (Lateral – Side to Side Adjustment) on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove backguard.
3. Loosen rear pillow block bearing bolts (C).
4. Back off jam nuts on the two (2) lateral adjustment bolts (A) and (B).
5. Simultaneously loosen one bolt and tighten the other. This will move the rear pillow block bearing. Center the basket in the wrapper cavity.
6. Tighten and secure both lateral adjustments bolts (A) and (B) and jam nuts.
7. Tighten pillow block bearings bolts (C) loosened in step 3.
8. Replace backguard.
9. Reestablish power to dryer.

To Replace Tumbler (Basket) or Tumbler (Basket) Support on the ADC AD-170:

1. Discontinue power to dryer.
2. Follow procedure for removal of main door assembly.
3. Follow procedure for removal of front panel assembly.
4. Remove backguard.
5. Remove tumbler belts.
6. Remove basket pulley.
7. Remove basket assembly and support.
   • Loosen the two (2) set screws on both the pillow block bearing collars.
   • Remove the retaining rings from the grooves of the tumbler shaft.
   • Remove the basket and support assembly from the front of the dryer. If the basket cannot be removed freely, clean the shaft area and spray WD-40 or similar lubricant. With a block of wood against the shaft end, strike the block wood with a hammer or mallet to move the shaft past any burrs made by the set screws.
8. Remove basket from basket support.
   • Remove the bolt in the center of the basket back wall.
   • Loosen and remove the eight (8) sets of nuts and washers from basket tie rods. Remove the eight (8) tie rods.
   • Replace either basket or basket support by reversing procedure.
9. Reassemble components onto dryer by reversing steps 2 through 8.
10. Check basket vertical/lateral alignment and adjust if necessary.
11. Replace backguard.
12. Reestablish power to dryer.

IMPORTANT: Never strike the shaft directly with a hammer for the ADC AD-170.

NOTE: Shims might be needed between tumbler and tumbler support to insure proper balancing of basket for the ADC AD-170.

To Replace Rear Tumbler (Basket) Support Pillow Block Bearing on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove backguard.
3. Remove basket pulley.
4. Loosen lateral adjustment jam nuts and bolts. (Refer to illustration in section G “Basket Alignment”)
5. Loosen set screws (2) from rear pillow block bearing collar.
6. Remove the rear bearing bolts, securing bearing to bearing mount. Remove bearing.
7. Replace by reversing steps 3 through 6.
8. Adjust both lateral and vertical basket alignment.
9. Replace backguard.
10. Reestablish power to dryer.

To Replace Front Basket Support Pillow Block Bearing on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove backguard.
3. Follow steps 3 through 6 from “Replacement of Rear Basket Support Pillow Block Bearing”.
4. Remove the two (2) retaining rings from the tumbler shaft.
5. Remove the two (2) bolts holding the front basket support pillow block bearing to the dryer.
6. Loosen bearing collar set screws (2) and as the end of the basket shaft is lifted up slightly, slide the bearing off the shaft.
7. Prop a block of wood between the basket shaft and the bearing to the dryer.
8. Replace by reversing steps 2 through 6.
9. Reestablish power to dryer.

NOTE: Before replacing back guard, check basket lateral/vertical adjustment, as well as, belt adjustment and readjust if necessary for the ADC AD-170.

To Replace Front Idler Shaft Pillow Block Bearing (Bearing nearest the back of the dryer) on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove V-belts from idler pulleys.
3. Remove bolts holding each idler pillow block bearing to mount.
4. Remove idler shaft (with both bearings and idler pulleys still attached) from dryer.
5. Remove end retaining ring and loosen the two (2) set screws in the bearing race collar.
6. Slide bearing off the shaft.
7. Replace bearing by reversing procedure.
8. Align idler pulley with basket pulley before tightening bolts.
9. Reestablish power to dryer.

NOTE: Replacement idler shaft is now manufactured with a hump on the shaft therefor no retainings are needed for the ADC AD-170.

To Replace Rear Idler Shaft Pillow Block Bearing on the ADC AD-170:

1. Follow steps 1 through 3 from “To Replace Front Idler Shaft Bearing”.
2. Remove retaining rings on each side of forward idler shaft pillow block bearing.
3. Loosen the two (2) set screws on each bearing collar.
4. Slide both bearings off the shaft.
5. Replace by reversing procedure.
6. Reestablish power to dryer.

NOTE: Replacement idler shaft is now manufactured with a hump on the shaft therefor no retainings are needed for the ADC AD-170.

For V-Belt Tension Adjustment (Basket to Idler) on the ADC AD-170:

1. Discontinue power to dryer.
2. Back off jam nuts on idler adjustment belts.
3. Tighten belts by turning both bolts evenly clockwise. (Turn clockwise to loosen belts.)
4. Check vertical plane of idler pulley for parallel alignment with basket pulley.
5. If realignment is required, loosen basket pulley and bushing, and move basket pulley to proper position.
6. Retighten jam nuts.
7. Reestablish power to dryer.

V-belts for the ADC AD-170 should have proper tension. If too loose, they will slip, excessive wear on the bearings will result. If the pulleys are not properly aligned, excessive belt wear will result. Proper belt tension will allow 1/2″ displacement under normal thumb pressure at mid span of belt.

NOTE: Belts must always be replaced in pairs (matched sets) for the ADC AD-170.

For V-Belt Tension Adjustment (Motor to Idler) on the ADC AD-170:

1. Discontinue power to dryer.
2. Loosen the nuts on the four (4) studs holding the drive motor mount to the back of the dryer.
3. Loosen the jam nuts on the adjustment screw on the top of the motor mount.
4. Turn the adjustment screw to lower the motor mount (to tighten the belts) or raise the motor mount (to loosen the belts).
5. Check the vertical plane of the motor pulley and idler pulley for parallel alignment.
6. If realignment is required, loosen motor pulley and bushing and move motor pulley to proper position.
7. Retighten motor mount bolts and jam nuts.
8. Reestablish power to dryer.

To replace V-Belts on the ADC AD-170:

1. Loosen tension on V-belts so that they can easily be rolled off pulleys.
2. Replace V-belts.
3. Retighten V-belts and adjust tension and alignment per previous instructions.

NOTE: Always replace V-belts in pairs for the ADC AD-170.

To replace the Drive Motor on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove drive belts.
3. Disconnect wiring harness from motor.
4. Remove bolts holding motor to mount and replace with new motor. Do not tighten bolts.
5. Remove pulley from old motor and install on new motor.
6. Align motor pulley with idler pulley and align motor shaft with idler shaft and tighten bolts.
7. Replace belts and adjust belt tension.
8. Retighten bolts.
9. Reestablish power to dryer.

To replace the Impellor Motor (Fan Shaft Drive – Steam Models 50 & 60 Hz and 50 Hz Gas Models ONLY) on the ADC AD-170:

1. Discontinue power to dryer.
2. Remove drive belts.
3. Disconnect wiring harness from motor.
4. Remove bolts holding motor to mount and replace with new motor. Do not tighten bolts.
5. Remove pulley from old motor and install on new motor.
6. Align motor pulley with fan shaft pulley and tighten bolts.
7. Replace belts and adjust belt tension.
8. Retighten bolts.
9. Reestablish power to dryer.

To replace the Impellor on the ADC AD-170:

1. Discontinue power to the dryer.
2. Remove the left side panel to access the fan shaft mount assembly.
3. Remove the two (2) left handed jam nuts that hold the impellor to the fan shaft.
4. Remove the impellor and the washers and the key.
5. Replace the impellor, key, washers, left handed jam nuts, and the side panel.
6. Re-establish power to the dryer.

To replace the Lint Screen on the ADC AD-170:

1. Pull out lint drawer.
2. Remove lint screen from lint drawer.
3. Drop new lint screen in place.
4. Slide lint drawer back into dryer.

To replace the Lint Drawer Switch on the ADC AD-170:

1. Disconnect power to dryer.
2. Remove lint drawer and lint door.
3. Disconnect both 4-pin connectors at the rear of the lint switch cover.
4. Remove the four (4) screws holding the lint switch cover on.
5. Remove lint switch cover and disconnect the two (2) terminals of the switch.
6. Remove switch by pressing tabs together and push switch out.
7. Install new switch by reversing procedure.

If there is “No display on computer” for the ADC AD-170, check the following:

1. Open circuit breaker switch or blown fuse.
2. Tripped overload on the blower MTR.
3. Bad wiring connection.
4. Faulty microprocessor (computer controller).

If the Computer will not accept key pad entries for the ADC AD-170, check the following:

1. Key pad ribbon is not plugged into computer securely.
2. Keypad is defective.
3. Faulty microprocessor (computer controller).

If the Dryer will not start, but computer display indicators are on for the ADC AD-170, check the following:

1. Failed contactors.
2. Failed arc suppressor (A.S.) board.
3. Failed microprocessor (computer).
4. Failed motors.

If the Drive motor runs, burner is on, but basket will not turn for the ADC AD-170, check the following:

1. Broken, damaged or loose V-belt.
2. Belts are contaminated (oil, grease, etc.).
3. Loose or broken pulley.

If the Drive motor and blower start, computer display heat indicator is on, but there is no heat for the ADC AD-170, check the following:

1. Lint coop automatic safety thermostat (225 degree) has failed.
2. Sail switch is out of adjustment, has failed, or sail switch damper is not closing due to back pressure created by a restriction in the exhaust system.
3. Failed burner hi-limit (330° for gas models, 290° for electric models) safety thermostat.
4. Failed ignitor/flame-probe assembly or probe is misadjusted.
5. Failed ignition DSI module.
6. Failed gas valve.
7. Failed microprocessor (computer) controller.

If the Dryer operates, probe sparks, but gas does not flow for the ADC AD-170, check the following:

1. Dryer gas shut-off valve is closed.
2. Failed gas valve (open coil in valve).
3. Loose wiring connection from DSI module to gas valve (Check voltage at gas valve).
4. Failed DSI module.

If the Dryer operates, probe sparks but there is no ignition even though gas is evident for the ADC AD-170, check the following:

1. Gas pressure is too low…Check manifold pressure and take necessary corrective action.
2. Failed gas valve.
3. Ignitor probe is out of adjustment (readjust within gas flow).
4. Lint accumulation in burner tubes.

If the Dryer operates but is taking too long to dry for the ADC AD-170, check the following:

1. An inadequate exhaust duct work system.
2. Restriction in exhaust system.
3. Insufficient make-up air.
4. Poor housekeeping…Dirty or clogged lint screen.
5. Washing machine extractors are not performing properly.
6. An exceptionally cold/humid or low barometric pressure atmosphere.
7. The supply gas may have a low heating value, check with local gas supplier.
8. Failed temperature sensor (temperature calibration is incorrect).
9. Failed microprocessor (computer) controller.

If the Thermal overload for the drive motor is tripping for the ADC AD-170, check the following:

1. Either an exceptionally low or high voltage supply.
2. Motor bearing failure.
3. Bearing failure in drive system.
4. Motor vents are blocked with lint.
5. Failed motor.
6. Insufficient make-up air.

If the Overload for the impellor (fan) motor is tripping for the ADC AD-170, check the following:

1. Either an exceptionally low or high voltage supply.
2. Motor bearing failure.
3. Motor vents are blocked with lint.
4. Failed motor.
5. Failed overload.
6. Out of balance impellor (fan).
7. Insufficient make-up air.

If the Dryer is cycling on burner hi-limit safety thermostat for the ADC AD-170, check the following:

1. Insufficient exhaust duct work…size or restriction in exhaust system.
2. Insufficient make-up air.
3. Lint screen needs cleaning.
4. Damaged impellor (fan).

If the Display reads “dSFL” (Dryer Sensor Circuit Failure) for the ADC AD-170, check the following:

1. Check 1/8 amp fuse on computer.
2. Faulty microprocessor temperature sensor probe.
3. Open circuit in either one of two (2) wires leading from the sensor probe to the computer
   • Connection at sensor bracket assembly connector
   • Connection at computer harness connector
4. Faulty microprocessor (computer) controller.

If the Dryer does not start and the Display reads “door” for the ADC AD-170, check the following:

1. Main door is open.
2. Lint drawer is open.
3. Faulty main door or lint door switch.
4. Open circuit in either main door or lint drawer switch harnesses.
5. Faulty 24 V transformer.

If there is excessive vibration coming from the basket (tumbler) for the ADC AD-170, check the following:

1. Basket is out of adjustment.
2. Loose or broken tie rod.
3. Failed tumbler support.

If there is “No Display Condition” during electrical troubleshooting for the ADC AD-170, check the following:

1. Check main fuses or circuit breaker.
2. Check blower motor overload… If tripped, reset.
3. Check fuse 1 or fuse 2 and if either are blown, replace.
4. Across terminal block nos. 6 and 8 you should be getting your 208 V or 240 V. If no voltage is present at 6 and 8, double check steps A and B and also check wires and terminations at these points.
5. Take voltage reading across the microprocessor 15 pin connector nos. 7 and 13. If there is voltage, replace the computer. If there is no voltage, there is a bad wire(s) or termination(s) between terminal block nos. 6 and 8 and microprocessor 15 pin connector nos. 7 and 13.

NOTE: In this next section ALL voltage checks must be done in the operating mode with the appropriate microprocessor dot on!! Also appropriate LED output light on!! for the ADC AD-170.

NOTE: In this next section when checking for voltage you are looking for 24 AC volts unless otherwise specified for the ADC AD-170.

If the Drive motor reverses but does not go forward, and the blower motor runs for the ADC AD-170, check the following:

1. If computer dot (First one on left) does not come on, replace computer.
2. Check for voltage across the coil of the reversing contactor located in the rear panel box. The contactor according to your diagram is marked CR2, also, the markings on the coil are Al and A2. If there is voltage, replace the coil or complete contactor. If there is no voltage, check for voltage across the two BS2 terminals on the arc suppressor board. If there is voltage across the two BS2 terminals and no voltage across the coil of the reversing contactor (Al and A2), the problem is bad wire(s) or termination(s) between BS2 and the connector coil.
3. If there is no voltage between BS2 terminals on the arc suppressor board, check for voltage across the two AS2 terminals on the board. If there is voltage across the two AS2 terminals and no voltage across the two BS2 terminals, replace the arc suppressor board. If there is no voltage across the two AS2 terminals, the problem is bad wire(s) or termination(s) between the arc suppressor board and the computer 15 pin connector no. 3 or a faulty computer.

If the Drive motor works in forward mode but does not reverse, and the blower motor runs for the ADC AD-170, check the following:

1. If computer dot (second one from left) does not come on, check program to see if set for reverse.
2. If set for reverse, replace computer.
3. Check for voltage across the coil of the reversing contactor located in the rear panel box. The contactor according to your diagram is CR3, also the markings on the coil are Al and A2. If there is voltage replace the coil or the complete contactor. If there is no voltage, check for voltage across the two BS1 terminals on the arc suppressor board. If there is voltage across the two BS1 terminals and no voltage across the coil of the reversing contactor (Al and A2), the problem is bad wire(s) or termination(s) between BS1 and the contactor coil.
4. If there is no voltage between the two BS1 terminals on the arc suppressor board, check for voltage across the two AS1 terminals on the board. If there is voltage across the two AS1 terminals and no voltage across the two BS1 terminals, replace the arc suppressor board. If there is no voltage across the two AS1 terminals, the problem is bad wire(s) or termination(s) between the arc suppressor board and the computer 15 pin connector no. 8, or a faulty computer.

If the Blower motor does not operate, but the drive motor runs for the ADC AD-170, check the following:

1. Check for voltage across terminals Al and A2 of the impellor contactor. This is the single contactor in the rear control box. If voltage is present check for voltage across the blow motor. If there is voltage at the blower motor replace the motor. If there is no voltage at the blower motor, problem is bad wire(s) or termination(s) between the contactor and the motor or a bad impellor contactor.
2. If there is no voltage present at Al and A2 of the contactor, check for voltage across the two BS3 terminals of the arc suppressor board. If there is voltage present at the two BS3 terminals, problem is bad wire(s) or termination(s) between the two BS3 terminals and the coil (A1 and A2) terminals. If there is no voltage across the two BS3 terminals, check for voltage across the two AS3 terminals. If there is voltage across the two AS3 terminals and there is no voltage between the two BS3 terminals, replace the arc suppressor board.
3. If there is no voltage across the two AS3 terminals, problem is bad wire(s) or termination(s) between the two AS3 terminals and the computer board 15 pin connector no. 5, or faulty computer.

For “No Heat” if the drive & blower motors run and the display reads normal (Gas Models) for the ADC AD-170, check the following:

1. Check for voltage across terminal block nos. 3 and 7. If no voltage is present, problem is bad wire or broken terminal from terminal block no. 3 to MP harness connector pin 4.
2. If voltage is present, check for voltage across terminal block nos. 4 and 7. If no voltage is present, problem is bad wire or broken terminal from terminal block 3 to tumbler hi-limit switch and back to terminal block no. 4, or faulty tumbler hi-limit switch.
3. If voltage is present, check for voltage across DSI module “TH” and “GND”. If no voltage is present, check voltage through the sail switch and burner hi-limit harness against ground. Also check for voltage at the terminals of both components. If voltage is not passing through any one of the two components, replace that component.
4. If voltage is present, refer to DSI technical manual (P/N 450119), or if equipped with ADC style DSI module refer to technical manual (P/N 450142).

For “No Heat” if the drive and blower motors run and the display reads normal (Steam Models) for the ADC AD-170, check the following:

1. Check for voltage across terminal block nos 3 and 7. If no voltage is present, problem is bad wire(s) or termination(s) between terminal block 3 to MP harness connector pin 4.
2. If voltage is present, check for voltage across terminal block nos. 4 and 7. If no voltage is present, problem is bad wire(s) or termination(s) from terminal block 3 to tumbler hi-limit switch and back to terminal block 4, or faulty tumbler hi-limit switch.
3. If voltage is present across terminal block nos 4 and 7, check for voltage across the Pneumatic Steam Damper Solenoid (red & green wires). If no voltage is present, problem is bad wire(s) or termination(s) between terminal block nos. 4 and 7 and the Damper Solenoid. If voltage is present, problem is faulty Damper Solenoid.

When the ADC AD-170 displays a “Door” condition, make sure the main door and lint drawer are closed. Also, if checking either switch, the plunger must be depressed.

Check LED input light “door” on component side of the computer. If light is on, replace computer.

Check voltage (24 VAC) across terminal block nos. 5 and 7 for the ADC AD-170.

If voltage is present, problem is bad wire(s) or termination(s) between terminal block 5 and computer 15 pin connector 2, or faulty computer.

If no voltage is present, check for voltage across the 15 pin modular connector nos. 1 and 2 against ground.

If voltage is evident at both points, problem is bad wire(s) or termination(s) between terminal block 5 and pin 2 of the 15 pin modular connector or pin 1 of that same connector to the in-line connector on the output of the 24 volt XFMR located in the computer box area.

If voltage is not evident at both points (nos. 1 & 2 of the 15 pin modular connector located in computer box area) with respect to ground for the ADC AD-170:

• If no voltage at either two points…Problem is faulty 24 V XFMR (P/N 141403).
• If voltage at one point, trace the voltage through the lint drawer switch and the main door switch and their connectors (J3 and J4), to the 15 pin modular connector 2.
• If voltage stops at any one of the switches, replace the switch.
• If voltage stops at a connector, check the termination or wire back to the prior connector.

Before continuing with this section check the .125 MA fuse on the computer board for the ADC AD-170.

A. Replace the temperature sensor underneath the basket on a bracket (the bullet shaped device).

B. If it still reads “DSFL”, unplug the 4 pin connector from the temperature sensor bracket. Also, unplug the microprocessor 15 pin connector from the computer board. Where the white/red striped wire is going into the connector, take a continuity reading across the wire and that same wire from the 4 pin connector that you unplugged earlier in this paragraph.

• If there is no continuity, check for break in wire, a short to the ground, loose termination(s), or even replace the wire.
• If there is continuity, do the same thing to the black wire right next to the white/red striped wire in the 15 pin connector.
• If there is no continuity, check for break in wire, a short to ground, loose termination(s), or even replace the wire.
• If there is continuity, computer board is faulty.

The connections represented by dots and lines on the motor plate illustration for the ADC AD-170 are as follows:

On Low Voltage:

• wire #14 is connected to wire #4.
• wire #1 is connected to wire #7, which in turn are both connected to L1.

On High Voltage:

• wire #14 is insulated or capped.
• wire #4 is connected to wire #7.
• wire #1 is connected to L1.