American Dryer Corp. ML-75HS manual

ADC Part No. 113001 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 .com 051697SL/tf W ARNING: For your safety the information in this manual must be followed to minimize[...]

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. Please specify the dryer model numbe[...]

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. CHILDREN SHOULD NOT BE ALLOWED[...]

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/operator's manual included with the dryer . Dryer(s) must not be installed or s[...]

Table of Contents SECTION I IMPOR T ANT INFORMA TION ............................................................................... 3 A. Receiving and Handling ............................................................................................................... 3 B. Safety Precautions .....................................................[...]

SECTION VI ROUTINE MAINTENANCE .................................................................................. 4 4 A. Cleaning ................................................................................................................................... 44 B. Adjustments ......................................................................[...]

3 SECTION I IMPOR T ANT INFORMA TION 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. If any dama[...]

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. PERSONAL INJURY or FIRE COULD [...]

5 7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust duct work, and inside the dryer . The frequency of inspection and cleaning can best be determined from experience at each location. W ARNING : The collection of lint in the burner area and exhaust duct work can create a potential fire haza[...]

6 BA SKET DIA METE R 37 " 94 c m BA S KE T D E P T H 36 " 91 .5 c m BASKE T MOTO R 1 H P* .7 46 k w DOOR O PENIN G ( D iam ete r) 3 1-3/8" 79 .7 c m BASKET VOLU ME 2 2. 4 cu . ft . . 634 c u.m. DR YE R S PER 20’ /40’ C O NT A IN E R 10 /20 DR YE R S PER 45’ /48" TR U CK 24 /24 VO L T AG E A V AI LAB LE 120-46 0v / 1 Ø -3 [...]

7 NOTE: ADC RESER VES THE RIGHT T O MAKE CHANGES IN SPECIFICA TIONS A T ANY TIME, WITHOUT NOTICE or OBLIGA TION. Specifications MLG-75HS MLE-75 MLS-75[...]

8 B. COMPONENT IDENTIFICA TION 1. DR YER FRONT VIEW Illus. No. Description 1 Controls 2 Control (top access) Door Assembly 3 Main Door Assembly 4 Lint Compartment Area (lint screen located behind door) 5 Data Label and Installation Label (located behind control [service] door)[...]

9 1. DR YER REAR VIEW NOTE : 1/8-inch Compressed Air Supply Inlet (for Steam Models ONLY) is located behind the Electric Service Relay Box. Illus. No. Description 1 Heating Unit 2 1/8" Compressed Air Supply Inlet (behind Electric Service Relay Box for steam units ONL Y) 3* Electric Service Relay Box 4 T umbler Bearing Mount Assembly 5 Idler Be[...]

10 SECTION III INST ALLA TION 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.Z223.1-LA TEST EDITION and/or National Electric Code ANSI/NFP A NO. 70-LA TES[...]

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. T o unskid the dryer , locate[...]

12 NOTE : Allowances must be made for opening the control door. Dryers may be 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. It is suggested that the dryer be positioned about two (2) feet away from the nearest obstruction for ease of installatio[...]

13 D. FRESH AIR SUPPL Y When the 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 is inadequate, drying time and drying efficiency will be adversely af fected. Ignition [...]

14 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 back pressure which results in slow drying, increased use of energy , overheating of the dryer , and shutdown of the burner by the airflow (sail) switch[...]

15 IMPOR T 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 larger (all the way around) than the duct. The duct must be centered within this ope[...]

16 IMPOR T ANT : For extended duct work runs, the cross section area of the duct work can only be increased to an extent. When the duct work approaches the maximum limits noted in this manual, a professional heating venting air conditioning (HV AC) firm should be consulted for proper venting information. ALL duct work should be smooth inside with n[...]

17 3. Multiple Dryer (common) V enting If it is not feasible to provide separate exhaust ducts for each dryer , ducts from individual dryers may be channeled into a "common main duct." The individual ducts should enter the bottom or side of the main duct at an angle not more than 45º in the direction of air flow and should be spaced at l[...]

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. In the absence of such codes, ALL electrical connections, materia[...]

20 2 . ELECTRICAL SER VICE SPECIFICA TIONS A. Gas and Steam Models IMPOR T ANT : Figures shown are for non-reversing models ONL Y . For reversing models contact the factory . IMPOR T ANT : The dryer must be connected to the electric supply shown on the data label that is affixed to the back side of the upper/top control door . In the case of 208 V [...]

21 B. Electric Models Only IMPOR T ANT : Figures shown are for non-reversing models ONL Y . For reversing models contact the factory . IMPOR T ANT : The dryer must be connected to the electric supply shown on the data label that is affixed to the back side of the upper/top control door . In the case of 208 V AC or 230/240 V AC, the supply voltage m[...]

22 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 E D IT I ON. The ground connection may be to a proven earth ground at the location service panel[...]

23 Si ng l e- Ph as e (1 Ø ) El e c tr i c a l C o n n e c ti on s L e ad s Bl a ck + Po s itiv e Wh i t e + Ne utr al Gr ee n + Gr o u nd or L2 Actual electrical wire connections are made to the L1 and L2 terminals of the motor contactor located in the rear service box mentioned above. The ground connection is also made to the copper lug also pro[...]

24 The only electrical input connections to the dryer are the 3-phase (3Ø) power leads (L1,L2,L3 and sometimes neutral) and ground. Single-phase (1Ø) power for the control circuit is done internally to the dryer . No single-phase (1Ø) input connection is required on a three phase (3Ø) dryer . For gas and steam dryers manufactured for operation [...]

25 3) 3-Phase W iring Connections/Hookup "Reversing Models Only" The electrical connections on ALL 3-phase (3 Ø) gas and steam dryers are made into the rear service box located at the upper left area of the dryer . Electrical connections for electrically heated dryers are made in the electric oven area located at the upper rear area of t[...]

26 IMPOR T ANT : A strain relief must be used where the input wiring enters the oven assembly . b) ELECTRICALL Y Heated 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 power for the control circuit and for any single phase (1 Ø) motors (if [...]

27 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. In the absence of such codes, ALL plumbing connections, materials, and workmanship must conform to the applicable require[...]

28 2. TECHNICAL GAS DA T A 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) --- 200,000 1 ) Natural Gas Regulation is controlled by the dryer's gas valve's internal regulator . Incoming supply pressure m[...]

29 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. The dryer is provided with a 3/4" N.P .T . inlet pipe connection[...]

30 Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-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 12.0 inches of water column pressure. NOTE : A water column te[...]

31 2. Steam Requirements - High Pressure Inlet -------- 1" supply line connection -- qty . one (1) at top manifold Return ----- 1" return line connection -- qty . one (1) at top manifold 3. Installation Instructions T o insure an adequate supply of steam is provided, be sure that the steam lines and steam return lines are sized and laid o[...]

32 g. W ater pockets in the supply line, caused by low points, will provide wet steam to the coil possibly causing steam coil damage. ALL horizontal runs of steam supply piping should be pitched 1/4-inch for every one (1) foot back towards the steam supply header causing the condensate in the line to drain to the header . Install a bypass trap in a[...]

33 3. STEAM DAMPER AIR SYSTEM CONNECTIONS The MLS-75 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. a. Air Requirements[...]

34 4. STEAM DAMPER SYSTEM OPERA TION The MLS-75 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. When the damper[...]

35 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 for instructions to check steam damper operation. If steam damper adjustment is necessary , locate [...]

36 I . P R E P 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 . 2. Check incoming supply voltage to be sure that it is the same as indicated on the dryer data label af[...]

37 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. 1. T urn on electric power to the dryer . a. O p[...]

38 Electrically Heated Dryers a. Check to insure that electric oven/contactor assembly is activating. 4. Make a complete operational check of ALL safety related circuits: a. Door Switch(es) b. Hi-Limit thermostats c. Sail switch (for Gas & Electric Models Only) NOTE: T o check for proper sail switch operation (for Gas & Electric Models Only[...]

39 8. 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 affect the coast-down and dwell (stop) times. The basket (tumbler) must come to a complete stop before starting in opposite direction. a. Microprocessor Models 1. Spin and stop are not adjustable in the[...]

40 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. GAS MODELS ... discontinue the gas supply . 1) SHUT OFF external gas supply [...]

41 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 . If service is required, contact the distributor from whom the ADC equipment was purchased. If the distributor cannot be contacted or is unknown, contact the ADC Service Department for a distribut[...]

42 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. 112254) is placed on the back side of the main door glass. These warranty cards are intended to serve the customer where we record the individual installation date and warranty information to better[...]

43 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. NOTE: If a part is marked [...]

44 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. Maximum operating efficiency is dependen[...]

45 STEAM MODELS - clean the steam coil fins. W e suggest using compressed air and a vacuum cleaner with brush attachment. W ARNING: When cleaning steam coil fins, be careful not to bend the fins. If fins are bent, straighten by using a fin comb which is available from local air-conditioning supply house. 90 DA YS 1. Remove lint from around basket ([...]

46 SECTION VII PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS 1. Microprocessor (computer) Board a . Upon completing installation of the replacement microprocessor (computer) board, reestablish power to the dryer . b. Start the drying cycle by pressing any of the preset cycles in letters A-F . c. V erify that the motor(s) and the heat ind[...]

47 V erify that the motor(s) heat, and door indicator lights on the back side of the microprocessor (computer) board are lit. (refer to the illustration below): 1. "F AN" (Blower) L.E.D. indicator 2. "FOR" (Forward) output L.E.D. indicator (for optional Reversing Models Only) 3. "Rev" (Reverse) output L.E.D. indicator [...]

48 d. Open main door . The dryer must stop and ALL output indicator lights on the back side of the micro- processor (computer) board must go out . (Refer to the illustration on previous page [ page 46 ].) e. T ry to restart the dryer with the main door open. f. The microprocessor (computer) board's L.E.D. display must read " DOOR ." [...]

49 SECTION VIII REVERSING TIMER SPIN/DWELL ADJUSTMENTS Dual timer models with "reversing option" have an electric reversing timer in the electric service box which is located in the upper rear area of the dryer . Both the dwell (stop) time and basket (tumbler) spin time are adjustable by mode selection switches located on the electronic t[...]

50 SECTION IX TECHNICAL INFORMA TION A. DA T A LA B E L Contact American Dryer Corporation When contacting American Dryer Corporation certain information is required to insure proper service / parts information from American Dryer . This information is on the data label located on the inside of the control door . When contacting American Dryer plea[...]

51 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. MANUF ACTURING CODE NUMBER The manufacturing code number is a number issued by ADC which describ[...]

ADC 113001 1 - 09/11/97-50 2* 01/12/98-50 3 - 04/16/98-50 4* 08/11/98-100 5* 12/07/98-100 6 - 09/21/99-100 7 - 01/03/00-200[...]