Instruction/ maintenance manual of the product ML-78 American Dryer Corp.
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ADC Part No. 113029 For replacement parts, contact the distributor from which the dryer was purchased or American Dryer Corporation 88 Currant Road Fall River MA 02720-4781 T elephone: (508) 678-9000 / Fax: (508) 678-9447 E-mail: techsupport@amdry .
Retain This Manual In A Safe Place For Future Reference Replacement parts can be obtained from your distributor or the ADC factory . When ordering replacement parts from the factory , you can F AX your order to ADC at (508) 678-9447 or telephone your orders directly to the ADC Parts Department at (508) 678-9000.
IMPOR T ANT YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPL Y and THE GAS SUPPL Y or THE STEAM SUPPL Y BEFORE ANY COVERS or GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING, ADJUST- ING , INST ALLA TION, or TESTING OF ANY EQUIPMENT per OSHA (Occupational Safety and Health Administration) ST ANDARDS.
W ARNING The dryer must never be operated with any of the back guards, outer tops, or service panels removed. PERSONAL INJUR Y or FIRE COULD RESUL T . IMPOR T ANT PLEASE OBSER VE ALL SAFETY PRECAUTIONS displayed on the equipment and/or specified in the installation and operator's manual included with the dryer .
Table of Contents SECTION I IMPOR T ANT INFORMA TION ............................................................................... 3 A. Receiving and Handling ..........................................................................................
SECTION V W ARRANTY INFORMA TION .............................................................................. 4 1 A. Returning W arranty Card(s) ...................................................................................................... 41 B.
3 SECTION I IMPORTANT INFORMATION A. RECEIVING and HANDLING The dryer is shipped in a protective stretch wrap cover with protective cardboard corners and top cover (or optional box) as a means of preventing damage in transit. Upon delivery, the dryer and/or packaging, and wooden skid should be visually inspected for shipping damage.
4 B. SAFETY PRECAUTIONS W ARNING : For your safety , the information in this manual must be followed to minimize the risk of fire or explosion or to prevent property damage, personal injury , or loss of life. W ARNING: The dryer must never be operated with any of the back guards, outer tops, or service panels removed.
5 7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust duct work, and area around the back of the dryer . The frequency of inspection and cleaning can best be determined from experience at each location.
6 IMPOR T ANT : S team dryers must be provided with a clean, dry , regulated 80 PSI (+/- 10 PSI) air supply . NOTE : ADC reserves the right to make changes in specifications at any time, without notice or obligation. Gas Steam Electric SECTION II SPECIFICATIONS/COMPONENT IDENTIFICATION A .
7 Specifications* MLG-78 (Gas) MLS-78 (Steam) NOTE : ADC reserves the right to make changes in specifications at any time, without notice or obligation. * Specifications for the MLS-78 (steam model) were not available at time of printing...for information contact the factory .
8 B. COMPONENT IDENTIFICA TION 1. Dryer Front V iew Illus. No. Description 1 Controls 2 Control (top access) Door Assembly 3 Main Door Assembly 4 Lint Compartment Area (lint screen located behind door.
9 2. Dryer Rear View Illus. No. Description 1 Heating Unit 2 1/8" Compressed Air Supply Inlet (behind Electric Service Relay Box for Steam Models ONL Y) 3* Electric Service Relay Box 4 T umbler B.
10 SECTION III INSTALLATION PROCEDURES Installation should be performed by competent technicians in accordance with local and state codes. In the absence of these codes, the installation must conform to applicable American National Standards: National Fuel Gas Code ANSI.
11 B. UNP ACKING/SETTING UP Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer . IMPOR T ANT : Dryer must be transported and handled in an upright position at ALL times. The dryer can be moved to its final location while still attached to the skid or with the skid removed.
12 NOTE : Allowances must be made for opening the control door . Dryers may positioned side wall to side wall. However , a 1/16" minimum allowance must be made for opening and closing of the control door and the lint door .
13 IMPOR T ANT : Even though a minimum of only 12-inches is required, 18-inches or more is suggested. The additional clearance is advantageous for ease of installation and service. IMPOR T ANT : When fire sprinkler systems are located above the dryers, a minimum of 18-inches above the dryer console (module) is required.
14 T o compensate for the use of registers or louvers used over the openings, this make-up air must be increased by approximately thirty-three percent (33%). Make-up air openings should not be located in an area directly near where exhaust vents exit the building.
15 E. EXHAUST REQUIREMENTS 1. General Exhaust Duct W ork Information Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct work will create excessive ba.
16 IMPORT ANT : Minimum duct work diameter for horizontal venting is 10-inches and for vertical venting the minimum is 12-inches. NOTE : Where the exhaust duct work passes through a wall, ceiling, or roof made of combustible materials, the opening must be 2-inches lar ger (all the way around) than the duct.
17 IMPOR T ANT : Minimum duct size for a dryer that is vented vertically is 12-inches for a round duct or an equivalent of 120 square inches. THE DUCT SIZE MUST NOT BE REDUCED ANYWHERE DOWN STREAM OF THE DRYER. IMPOR T ANT : For extended duct work runs, the cross section area of the duct work can only be increased to an extent.
18.
19 F . ELECTRICAL INFORMA TION 1. Electrical 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.
20 2. Electrical Service Specifications IMPOR T ANT : The dryer must be connected to the electric supply shown on the data label that is affixed to the back of the dryer , at the upper right hand corner . In the case of 208 V AC or 240 V AC, the supply voltage must match the electric service specifications of the data label exactly .
21 3. Grounding A ground (earth) connection must be provided and installed in accordance with state and local codes. In the absence of these codes, grounding must conform to applicable requirements of the National Electric Code ANSI/NFP A NO. 70-LA TEST EDITION.
22 Connect L1 and L2 to the power block and ground to the copper lug located in the rear service box mentioned above. S IN G L E -P HA S E (1 ø) E LE CTR I C AL C ONN EC TI ON L EAD S B LA C K + P OSIT I VE W HI TE + N EU TR A L G REE N + G RO U N D OR L2 If local codes permit, power to the dryer can be made by the use of a flexible U.
23 1) GAS MODELS and STEAM MODELS ONL Y The only electrical input connections to the dryer are the 3-phase (3 ø ) power leads (L1,L2,L3 and sometimes neutral) and ground. Single-phase (1 ø ) power for the control circuit is done internally to the dryer .
24 1) ELECTRICALL Y HEA TED MODELS ONL Y The only electrical input connections to the dryer are the 3-phase (3 ø ) power leads (L1,L2,L3 and sometimes neutral) and ground. Single-phase (1 ø ) power for the control circuit is done internally to the dryer .
25 The only electrical input connections to the dryer are the 3-phase (3 ø ) power leads (L1,L2,L3 andsometimes neutral) and ground. Single-phase (1 ø )power for the control circuit is done internally to the dryer . No single-phase (1 ø ) input connection is required on a 3-phase (3 ø ) dryer .
26 G. GAS INFORMA TION It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the gas plumbing installation is adequate and conforms with local and state regulations or codes.
27 2. T echnical Gas Data a. Gas Specifications b . Gas Connections: Inlet connection ---------- 3/4-inch N.P .T . Inlet supply size ---------- 3/4-inch N.P .T . (minimum) Btu/hr input (per dryer) - 204,000 1) Natural Gas Regulation is controlled by the dryer's gas valve's internal regulator .
28 3. Piping/Connections ALL components/materials must conform to National Gas Code specifications. It is important that gas pressure regulators meet applicable pressure requirements and that gas meters be rated for the total amount of ALL the appliance BTU's being supplied.
29 Consistent gas pressure is essential at ALL gas connections. It is recommended that a 2-inch pipe gas loop be installed in the supply line serving a bank of dryers. An in-line pressure regulator must be installed in the gas supply line (header) if the (natural) gas pressure exceeds 12.
30 H. STEAM INFORMA TION It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the gas plumbing installation is adequate and conforms with local and state regulations or codes.
31 c. Flexible hoses or couplings must be used. The dryer vibrates slightly when it runs and this will cause the steam coil connections to crack if they are hard piped to the supply and return mains. d. Shut-off valves for each dryer should be installed in the supply line, return line, and drip trap return line.
32 4. Steam Damper Air System Connections The MLS-78 is manufactured with a pneumatic (piston) damper system which requires an external supply of compressed air . The air connection is made to the steam damper solenoid valve which is located at the rear inner top area of the dryer just in front of the electric service relay box.
33 5. Steam Damper System Operation The MLS-78 steam damper shown in Diagram 1 in the illustration below , allows the coil to stay constantly charged eliminating repeated expansion and contraction. When the damper is opened, the air immediately passes through the already hot coil, providing instant heat to start the drying process.
34 5. Steam Damper Air Piston (Flow Control) Operation Adjustment Although the steam damper operation was tested and adjusted prior to shipping at 80 PSI, steam damper operation must be checked before the dryer is put into operation. Refer to page 33 or instructions to check steam damper operation.
35 I. PREP ARA TION FOR OPERA TION/ST AR T -UP The following items should be checked before attempting to operate the dryer: 1. Read ALL " CAUTION ," " W ARNING ," and " DIRECTION " labels attached to the dryer .
36 J. PREOPERA TIONAL TESTS ALL dryers are thoroughly tested and inspected before leaving the factory . However , a preoperational test should be performed before the dryer is publicly used. It is possible that adjustments have changed in transit or due to marginal location (installation) conditions.
37 c. Electric Models 1) Check to insure that electric oven/contactor assembly is activating. 3. Make a complete operational check of ALL safety related circuits: a.
38 7. REVERSING MODELS ONL Y - basket (tumbler) dryer should never be operated with less than a 30 lb. load (dry weight). The size of the load will af fect the coast-down and dwell (stop) times. The basket (tumbler) must come to a complete stop before starting in opposite direction.
39 L. SHUT DOWN INSTRUCTIONS If the dryer is to be shut down (taken out of service) for a period of time, the following MUST BE performed; 1. Discontinue power to the dryer either at the external disconnect switch or the circuit breaker . 2. Discontinue the heat supply: a.
40 SECTION IV SER VICE/P AR TS INFORMA TION A. SER VICE 1. Service must be performed by a qualified trained technician, service agency , or gas supplier .
41 SECTION V W ARRANTY INFORMA TION A. RETURNING W ARRANTY CARD(S) 1. Before any dryer leaves the ADC factory test area, a warranty card ( ADC Part No.
42 2. Each part must be tagged with the following information: a. Model number and serial number of the dryer from which part was removed. b. Nature of failure (be specific). c. Date of dryer installation. d. Date of part failure. e. Specify whether the part(s) being returned is for a replacement, a credit, or a refund.
43 SECTION VI ROUTINE MAINTENANCE A. CLEANING A program and/or schedule should be established for periodic inspection, cleaning, and removal of lint from various areas of the dryer , as well as throughout the duct work system. The frequency of cleaning can best be determined from experience at each location.
44 STEAM DRYERS Clean the steam coil fins. Suggest using compressed air and a vacuum cleaner with brush attachment. NOTE : When cleaning steam coil fins, be careful not to bend the fins. If the fins are bent, straighten by using a fin comb , which is available from any local air conditioning supply house.
45 SECTION VII REVERSING TIMER SPIN/DWELL ADJUSTMENTS T imer models have an electronic reversing timer in the electrical service box which is located in the upper left rear area of the dryer .
46 SECTION VIII DA T A LABEL LOCA TION/INFORMA TION DA T A LABEL When contacting American Dryer Corporation , certain information is required to in- sure proper service/parts information from ADC . This information is on the data label that is located in the left inside front side panel (as shown in the illustration above).
47 THE DA T A LABEL 1. MODEL DR YER The model number is an ADC number which describes the size of the dryer and the type of heat (gas, electric, or steam). 2. SERIAL NUMBER The serial number allows ADC to gather information on your particular dryer . 3.
48 SECTION IX PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS 1. Hot Surface Ignition (HSI) System a. Upon completing installation of the replacement Hot Surface Ignition (HSI) module, reestablish power to the dryer . b. Start the drying cycle.
ADC 113029 1 - 01/19/98-50 2- 10/14/98-0 3* 01/11/99-20 4* 04/26/99-35.
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