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Service Procedures
for the Model 20 Dryers
(AD-20, SL20, CG20, D20, and
STI-8 Dryers GEN II)
ADC Part No. 450261
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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 supply and the gas supply or the steam supply Part Locations and Removal ................4 before any covers or guards are removed from Lower Front Panel Removal ......................................... 4 the machine to allow access for cleaning, adjusting, installation, or testing of any equipment Upper Front Panel Removal ......................................... 4 per OSHA (Occupational Safety and Health Back Guard Remo
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Part Locations and Removal LOWER FRONT PANEL REMOVAL: Remove the lint drawer. Remove the four screws located just below the loading door. Tilt the top of the panel out and lift the panel up and away from the dryer. UPPER FRONT PANEL REMOVAL: Remove the four screws located just above the loading door. Tilt the bottom of the panel out and lift the panel up and away from the dryer. 4 American Dryer Corp. 450261-2
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BACK GUARD REMOVAL: TOP COVER REMOVAL: Remove all facing visible screws. With the back guard removed, the top is removed by pulling it toward the rear of the dryer and up. LINT BOX / BLOWER ASSEMBLY REMOVAL: Unplug wires from Direct Spark Ignition (DSI) Remove screws and nuts at the rear of the lint box. module. Unplug wires from the capacitor. 450261-2 www.amdry.com 5
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LINT BOX / BLOWER ASSEMBLY REMOVAL (continued): Remove two screws just above the lint drawer. Pull the lint box down from the front and out slightly. To remove motorized impellor assembly, remove five Unplug three connections at the left of the lint box. The lint box may now be pulled out through the front screws and four nuts shown at the arrows. of the dryer. Lift off cover and pull motorized impellor assembly out through the opening. 6 American Dryer Corp. 450261-2
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GAS VALVE REMOVAL: OVEN REMOVAL: Be sure to shut off the gas main and then proceed The oven can be removed with or without the gas to remove electrical connections and screws valve in place. indicated. Disconnect union and U-Bolt located just behind the union and the oven base. The U-Bolt is Be sure to shut off the gas supply to the dryer. The more easily accessed through the rear of the dryer. back guard, heat duct, and lower front panel must be removed. Remove the gas valve electrical The
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TUMBLER SUPPORT WHEEL ASSEMBLY REPLACEMENT: The front wheel assemblies can be replaced with the lower front panel removed. Remove the three bolts by reaching upward with a socket or box wrench. The illustration on the right is provided to show the location of these wheels as the wheels cannot easily be seen while standing in front of the dryer. The left rear wheel assembly can be removed with just the back guard removed. The rear right wheel requires removing the back guard, heat duct, and ov
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TUMBLER ALIGNMENT: Proper alignment is achieved by making the gap between the tumbler and openings in the front and rear bulkheads equal on all sides. The gap may be checked for accuracy by using a thickness gauge. Adjust the tumbler position by loosening the three bolts and forcing the wheel assembly toward the center of the dryer to raise the tumbler and to move it away from the side. A large screwdriver can provide the necessary leverage. Adjustment of the front of the tumbler is made the sa
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Electrical Component Locations ELECTRICAL PANEL: The electrical panel is located behind the front upper panel. F1 J11 P14 Terminal Block A B C Transformer Relay 3 Relay 2 Relay 1 25VAC Drive Blower Door Switch J5 DOOR SWITCH: OVEN CONTACTOR: On upper front panel. Lower right front of the dryer (electric oven models). Oven Contactor Door Switch 10 American Dryer Corp. 450261-2
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FIRE SUPPRESSION SYSTEM ITEMS DIRECT SPARK IGNITION (DSI) MODULE: AND SAIL SWITCH: Lower right front of the dryer to left of the lint box. Rear of the dryer. Water Pressure Switch Sail Switch Solenoid Valve Thermistor Probe DSI Module FLAME-PROBE: FLAME-PROBE POSITIONING: Under the gas oven and accessed from the rear of Viewed from the rear of the dryer with heat duct the dryer. removed. Proper spark gap is approximately 1/8” (3.175 mm) and is located 1/4” (6.325 mm) from Screw locations at arr
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EXHAUST PROBE, EXHAUST HI-LIMIT, ROTATION SWITCH: AND LINT DRAWER SWITCH: Just behind the upper front panel, as viewed from Temperature probe and exhaust hi-limit are the rear of the dryer with top removed. accessible once the lint box is removed. The lint drawer switch can be removed after the cover has been removed. Exhaust Hi-Limit Switch Exhaust Temperature Probe Rotation Lint Drawer Switch Rotation Switch Switch Magnet 12 American Dryer Corp. 450261-2
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Belt Installation REQUIRED ITEMS: 4 feet of Number 16 or 18 Electrical Wire Duct Tape Phillips Screw Driver 5/16” Nut Driver Electrical Tape 3 foot Section of 1-1/2” Electrical Tubing One 6-inch Cable Tie Replacement Belt Remove the back guard, front upper panel, and front lower panel. Cut the locking end off the plastic wire tie and use a piece of electrical tape to secure the wire tie to one end of the 4-foot section of electrical wire (Fig. 1). FIG. 1 FIG. 2 FIG. 3 Push the wire tie between
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Pull the belt up through the tumbler felt until there is enough belt to begin to loop the belt around the tumbler (Fig. 7 and 8). Tape the belt to the outside of the tumbler with duct tape approximately 2-inches from the outside edge of the tumbler (Fig. 9). Rotate the tumbler slowly in the clockwise direction, while pulling the end of the belt to the right side of the dryer. Continue to rotate the tumbler clockwise and proceed to tape the belt to the outside of the tumbler occasionally, to a
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Pulling the belt through the tumbler felt gap will tend to flip the felt. Before pulling the last few inches out of the tumbler, lace the electrical wire back through the loop in the belt (Fig. 13 on the previous page). Pull the remaining belt and a couple of inches of wire out of the tumbler and into the area above the tumbler. Slide the belt to the middle of the tumbler. With the electrical wire pulled tight (Fig. 14 on the previous page), rotate the tumbler one or two turns. This should fl
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ADC Part No. 450261 2 - 09/15/05 - 1
