American Dryer Corp. | ML-75HS | Installation manual | American Dryer Corp. ML-75HS Installation manual

American Dryer Corp. ML-75HS Installation manual
ML-75HS
(Gas/Electric/Steam)
Installation Manual
WARNING: 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 death.
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette
notice pour réduire au minimum le risque
d’incendie ou d’explosion ou pour éviter tout
dommage matériel, toute blessure ou la mort.
Do not store or use gasoline or other flammable
vapor and liquids in the vicinity of this or any
other appliance.
Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inflammables dans
le voisinage de cet appareil ou de tout autre
appareil.
WHAT DO YOU DO IF YOU SMELL GAS
* Do not try to light any appliance.
* Do not touch any electrical switch; do not use
any phone in your building.
* Clear the room, building or area of all
occupants.
* Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
* If you cannot reach your gas supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
* Ne pas tenter d’allumer d’appareil.
* Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment où vous vous trouvez..
* Évacuez la pièce, le bâtiment ou la zone.
* Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
* Si vous ne pouvez rejoindre le fournisseur
de gaz, appelez le service des incendies.
L’installation et l’entretien doivent être assurés
par un installateur ou un service d’entretien
qualifié ou par le fournisseur de gaz.
For replacement parts, contact the distributor from which the dryer
was purchased or
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781
Telephone: (508) 678-9000 / Fax: (508) 678-9447
E-mail: techsupport@amdry.com
051697SL/tf
ADC Part No. 113001
Retain This Manual In A Safe Place For Future Reference
American Dryer Corporation products embody 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/operator's manual
included with the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
POUR VOTRE SÉCURITÉ
Do not store or use gasoline or
other flammable vapors or liquids
in the vicinity of this or any other
appliance.
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables dans le voisinage de cet
appareil ou de yout autre appareil.
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.
Important
For your convenience, log the following information:
DATE OF PURCHASE
MODEL NO.
DISTRIBUTORS NAME
Serial Number(s)
Replacement parts can be obtained from your distributor or the ADC factory. When ordering replacement parts from the
factory, you can FAX 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 number and serial number in addition to the description and part number, so
that your order is processed accurately and promptly.
The illustrations on the following pages may not depict your particular dryer exactly. The illustrations are a composite of the
various dryer models. Be sure to check the descriptions of the parts thoroughly before ordering.
“IMPORTANT NOTE TO PURCHASER”
Information must be obtained from your local gas supplier on the instructions
to be followed if the user smells gas. These instructions must be posted in a
prominent location near the dryer.
IMPORTANT
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.
“Caution: Label all wires prior to
disconnection when servicing controls. Wiring
errors can cause improper operation.”
«Attention: Lor des opérations d’entretien
des commandes étiqueter tous fils avant
de les déconnecter. Toute erreur de
câblage peut étre une source de danger et
de panne.»
CAUTION
DRYER(S) SHOULD NEVER BE LEFT UNATTENDED WHILE IN OPERATION.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYER(S).
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN OPERATION.
FOR YOUR SAFETY
DO NOT DRY MOP HEADS IN THE DRYER.
DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES should the door switch or the heat circuit devices
ever be disabled.
WARNING
The dryer must never be operated with any of the back guards, outer tops, or service
panels removed. PERSONAL INJURY or FIRE COULD RESULT.
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN
PLACE...EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
IMPORTANT
PLEASE OBSERVE 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 stored in an area where it will be exposed to water and/or
weather.
The wiring diagram for the dryer is located in the front electrical control box area.
Table of Contents
SECTION I
IMPORTANT INFORMATION ............................................................................... 3
A. Receiving and Handling ............................................................................................................... 3
B. Safety Precautions ....................................................................................................................... 3
SECTION II
SPECIFICATIONS .................................................................................................... 6
A. Specifications .............................................................................................................................. 6
B. Component Identification ............................................................................................................. 8
SECTION III
INSTALLATION PROCEDURES ......................................................................... 10
A. Location Requirements .............................................................................................................. 10
B. Unpacking/Setting Up ............................................................................................................... 11
C. Dryer Enclosure Requirements .................................................................................................. 12
D. Fresh Air Supply ....................................................................................................................... 13
E. Exhaust Requirements ............................................................................................................... 14
F. Electrical Information ................................................................................................................ 19
G. Gas Information ........................................................................................................................ 27
H. Steam Information ..................................................................................................................... 30
I. Preparation For Operation/Start-up .......................................................................................... 36
J. Preoperational Tests .................................................................................................................. 37
K. Preoperational Instructions ........................................................................................................ 39
L. Shut Down Instructions .............................................................................................................. 40
SECTION IV
SERVICE/PARTS INFORMATION ...................................................................... 41
A. Service ..................................................................................................................................... 41
B. Parts ......................................................................................................................................... 41
SECTION V
WARRANTY INFORMATION .............................................................................. 42
A. Returning Warranty Card(s) ...................................................................................................... 42
B. Parts ......................................................................................................................................... 42
C. Returning Warranty Card(s) ...................................................................................................... 42
SECTION VI
ROUTINE MAINTENANCE .................................................................................. 44
A. Cleaning ................................................................................................................................... 44
B. Adjustments .............................................................................................................................. 45
SECTION VII
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ....................................................................................................... 46
SECTION VIII
REVERSING TIMER SPIN/DWELL ADJUSTMENTS .................................... 49
SECTION IX
TECHNICAL INFORMATION .............................................................................. 50
Data Label ..................................................................................................................................... 50
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. If any damage whatsoever is noticed, inspect further
before delivering carrier leaves.
Dryers damaged in shipment.
1. ALL dryers should be inspected upon receipt and before they are signed for.
2. If there is suspected damage or actual damage, the trucker's receipt should be so noted.
3. If the dryer is damaged beyond repair, it should be refused. Those dryers which were not damaged in a
damaged shipment should be accepted, but the number received and the number refused must be noted
on the receipt.
4. If you determine that the dryer was damaged after the trucker has left your location, you should call the
delivering carrier's freight terminal immediately and file a claim. The freight company considers this
concealed damage. This type of freight claim is very difficult to get paid and becomes extremely difficult
when more than a day or two passes after the freight was delivered. It is your responsibility to file freight
claims. Dryer/parts damaged in transit cannot be claimed under warranty.
5. Freight claims are the responsibility of the consignee, and ALL claims must be filed at the receiving end.
ADC assumes no responsibility for freight claims or damages.
6. If you need assistance in handling the situation, please contact the ADC Traffic Manager at
(508) 678-9000.
IMPORTANT: The tumbler section of the dryer must be transported and handled in an upright
position at all times.
3
B. SAFETY PRECAUTIONS
WARNING: 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.
WARNING: The dryer must never be operated with any of the back guards, outer tops, or
service panels removed. PERSONAL INJURY or FIRE COULD RESULT.
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
2. Purchaser/user 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.
3. WHAT TO DO IF YOU SMELL GAS..
a. DO NOT try to light any appliance.
b. DO NOT touch any electrical switch.
c. DO NOT use any phone in your building.
d. Clear the room, building, or area of ALL occupants.
e. Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
f. If you cannot reach your gas supplier, call the fire department.
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.
WARNING: Dry only water-washed fabrics. DO NOT dry articles spotted or washed in dry
cleaning solvents, a combustible detergent, or "all purpose" cleaner.
EXPLOSION COULD RESULT.
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil,
paint, wax. EXPLOSION COULD RESULT.
WARNING: DO NOT dry mop heads. 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 rubber materials. Drying in a heated basket (tumbler) may
damage plastics or rubber and also may be a fire hazard.
4
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.
WARNING: The collection of lint in the burner area and exhaust duct work can create a
potential fire hazard.
8. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the
National Electric Code ANSI/NFPA NO. 70-LATEST EDITION.
NOTE: Failure to do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switches, lint door switch, heat safety circuit
ever be disabled.
WARNING: PERSONAL INJURY or FIRE COULD RESULT.
10. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
11. Remove articles from the dryer as soon as the drying cycle has been completed.
WARNING: Articles left in the dryer after the drying and cooling cycles have been completed
can create a fire hazard.
12. DO NOT operate steam dryers with more than 125 PSI steam pressure. Excessive steam pressure can
damage steam coil and/or harm personnel.
13. Replace leaking flexible hoses or other steam fixtures immediately. DO NOT operate the dryer with
leaking flexible hoses. PERSONAL INJURY MAY RESULT.
14. The normal PH level for copper type steam coils must be maintained between a value of 8.5 to 9.5.
For steel type steam coils the PH level must be maintained between a value of 9.5 to 10.5. These
limits are set to limit the acid attack of the steam coils.
IMPORTANT: Coil failure due to improper PH level will VOID THE WARRANTY.
15. READ and FOLLOW ALL CAUTION and DIRECTION LABELS ATTACHED TO THE DRYER.
WARNING: YOU MUST DISCONNECT and LOCKOUT THE ELECTRIC SUPPLY and
THE GAS 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.
5
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION
A. SPECIFICATIONS
BASKET DIAMETER
37"
94 cm
BASKET DEPTH
36"
91.5 cm
BASKET MOTOR
1 HP*
.746 kw
DOOR OPENING (Diameter)
31-3/8"
79.7 cm
22.4 cu. ft.
.634 cu.m.
BASKET VOLUME
DRYERS PER 20’/40’ CONTAINER
10/20
DRYERS PER 45’/48" TRUCK
24/24
Gas
VOLTAGE AVAILABLE
120-460v / 1Ø-3Ø / 50/60 Hz
APPROX. WEIGHT (Uncrated)
721 lbs.
327 kg
APPROX. WEIGHT (Crated)
771 lbs.
349.7 kg
200,000 btu/hr
50,400 kcal/hr
1,200 cfm
33.98 cmm
3/4**
1.91 cm
HEAT INPUT
AIRFLOW
Electric
INLET PIPE SIZE
VOLTAGE AVAILABLE
208-460v / 1Ø-3Ø / 50/60 Hz
APPROX. WEIGHT (Uncrated)
721 lbs.
327 kg
APPROX. WEIGHT (Crated)
771 lbs.
349.7 kg
1,200 cfm
33.98 cmm
AIRFLOW
VOLTAGE AVAILABLE
120-460v / 1Ø-3Ø / 50/60 Hz
APPROX. WEIGHT (Uncrated)
757 lbs.
343.4 kg
APPROX. WEIGHT (Crated)
807 lbs.
366.1 kg
1,350 cfm
38.23 cmm
.75 cfh
.02 cmh
1/8" F.P.T.
.318 cm
Steam
AIRFLOW
COMPRESSED AIR VOLUME
AIR CONNECTION
STEAM CONSUMPTION
238.7 lbs./hr
108.3 kg/hr
OPERATING STEAM PRESSURE
125 psi max
BOILER HP NORMAL
LOAD
8.6 kg/sq cm
7
STEAM SUPPLY
1"
2.54 cm
STEAM SUPPLY
1"
2.54 cm
* For non-reversing models.
** A minimum of 3/4" pipe must be supplied to the gas inlet for each dryer.
Shaded areas are stated in metric equivalents.
IMPORTANT: Steam dryers must be provided with 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.
6
Specifications
MLG-75HS
MLE-75
MLS-75
NOTE: ADC RESERVES THE RIGHT TO MAKE CHANGES IN SPECIFICATIONS AT
ANY TIME, WITHOUT NOTICE or OBLIGATION.
7
B. COMPONENT IDENTIFICATION
1. DRYER FRONT VIEW
Illus. No.
1
2
3
4
5
Description
Controls
Control (top access) Door Assembly
Main Door Assembly
Lint Compartment Area (lint screen located behind door)
Data Label and Installation Label (located behind control [service] door)
8
1. DRYER REAR VIEW
Illus. No.
1
2
3*
4
5
6
7
8
9
Description
Heating Unit
1/8" Compressed Air Supply Inlet
(behind Electric Service Relay Box for steam units ONLY)
Electric Service Relay Box
Tumbler Bearing Mount Assembly
Idler Bearing Mount Assembly
Blower Motor Assembly
Leveling Leg (rear)
Basket (Drive) Motor Assembly (Reversing Models ONLY)
Dryer Exhaust
* Electric service connections for Gas & Steam Models are made in this box.
NOTE: 1/8-inch Compressed Air Supply Inlet (for Steam Models ONLY) is located behind
the Electric Service Relay Box.
9
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.Z223.1-LATEST EDITION and/or National Electric Code ANSI/NFPA NO. 70-LATEST
EDITION.
A. LOCATION REQUIREMENTS
Before installing the dryer, be sure the location conforms to local codes and ordinances. In the absence of such
codes or ordinances the location must conform with the National Fuel Gas Code ANSI.Z223.1-LATEST
EDITION.
1. The dryer must be installed on a sound level floor capable of supporting its weight. It is recommended that
carpeting be removed from the floor area that the dryer is to rest on.
2. The dryer must not be installed or stored in an area where it will be exposed to water and/or weather.
3. The dryer is for use in noncombustible locations.
4. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air Supply in
Section D).
5. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer
Enclosure Requirements in Section C).
6. Provisions must be made for adequate clearances for servicing and for operation as noted in this manual
(refer to Dryer Enclosure Requirements in Section C).
7. Dryer must be exhausted to the outdoors (refer to Exhaust Requirements in Section E).
8. Dryer must be located in an area where correct exhaust venting can be achieved as noted in the manual
(refer to Exhaust Requirements in Section E).
IMPORTANT: Dryer should be located where a minimum amount of exhaust duct will be necessary.
10
B. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer.
IMPORTANT: 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. To unskid the dryer, locate and remove the four (4) bolts securing the base of the dryer to the wooden
skid. Two (2) are at the rear base (remove the back panel for access), and two (2) are located in the bottom of
the lint chamber. To remove the two (2) bolts located in the lint chamber area, remove the lint door.
With the skid removed, to make it easier to slide the dryer into its final position, slightly lower ALL four (4)
leveling legs, so that the dryer will slide on the legs instead of the base frame.
To increase bearing life and improve efficiency, the dryer should be tilted slightly to the rear.
The basket (tumbler) is supported during shipping by a wooden block. REMOVE THIS BLOCK BEFORE
STARTING THE DRYER.
IMPORTANT: For microprocessor (computer) models, this wooden block must be removed
before connecting power to the dryer or irreparable damage to the basket
(tumbler) will result.
The lint coops of ALL ML-75 dryers are supported during shipping by a bracket. REMOVE THIS BRACKET
BEFORE STARTING THE DRYER.
1. Leveling Dryer
The dryer is equipped with four (4) leveling legs, one at each corner of the base. Two (2) are located at
the rear of the dryer base, and two (2) are located in the lint chamber (coop). To increase bearing life and
improve efficiency, the dryer should be tilted slightly to the rear.
11
C. DRYER ENCLOSURE REQUIREMENTS
Bulkheads and partitions should be made of noncombustible materials and must be located a minimum of
twelve (12) inches (18-inches or more is recommended for ease of installation, maintenance , and service) above
the dryer outer top, except along the front of the dryer which may be partially closed in if desired. The clearance
between the bulkhead header and the dryer must be a minimum of four (4) inches and must not extend more
than four (4) inches to the rear of the front. The bulkhead facing must not be closed in all the way to the top of
the dryer. A one (1) inch clearance is required.
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 installation, maintenance, and service (to be measured
from the back guard.) (Refer to the illustration above for details.)
NOTE: Air considerations are important for proper and efficient operation.
IMPORTANT: 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.
IMPORTANT: When fire sprinkler systems are located above the dryers, a minimum of
18-inches above the dryer console (module) is required. Dryers may be
positioned side wall to side wall however, a 1/16-inch minimum allowance is
required between dryers (or wall) for ease of installation and maintenance.
Allowances must be made for the opening and closings of the control door and
the lint door.
12
D. FRESH AIR SUPPLY
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 affected. Ignition problems
and sail switch "fluttering" problems may result, as well as premature motor failure from overheating.
Air supply (make-up air) must be given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An air flow of 1,200 cfm (cubic feet per minute) must be
supplied to each gas and electric dryer and 1,350 cfm (cubic feet per minute) must be supplied to each steam
dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of a minimum of 1-1/2
square feet is required for each dryer.
To 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.
It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to ALL
the dryers.
EXAMPLE: For a bank of four (4) dryers, two (2) unrestricted openings measuring 2 feet by
1-1/2 feet (6 square feet) is acceptable.
Allowances must be made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
IMPORTANT: Make-up air must be provided from a source free of dry cleaning solvent fumes.
Make-up air that is contaminated by dry cleaning solvent fumes will result in
irreparable damage to motors and other dryer components.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
13
E. EXHAUST REQUIREMENTS
1. General Exhaust Duct Work 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) switches,
burner hi-limits, or basket (tumbler) hi-heat thermostats.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
The duct work should be laid out in such a way that the duct work travels as directly as
possible to the outdoors with as few turns as possible. Single or independent dryer venting is
recommended.
Horizontal Venting:
When single dryer venting is used, the length of duct work, from the dryer to the outside exhaust outlet,
should not exceed fifteen (15) feet. The minimum diameter of this duct work must be at least 10-inches
(even though the dryer exhaust duct for gas and electric units is only 8-inches). In the case of multiple
(common) dryer venting, the distance from the last dryer to the outside exhaust outlet should not exceed
fifteen (15) feet. The shape of the duct work is not critical so long as the minimum cross-sectional area is
provided. It is suggested that the use of 90° turns be avoided; use 30° and/or 45° angles instead. The radius
of the elbows should preferably be 1-1/2 times the diameter of the duct. Including basket (tumbler)/dryer
elbow connections or elbows used for outside protection from the weather, no more than two (2) elbows
should be used in the exhaust duct run. If more than two (2) elbows are used, the cross sectional area of
the duct work must be increased. ALL duct work should be smooth inside with no projections from sheet
metal screws or other obstructions which will collect lint. When adding ducts, the duct to be added should
overlap the duct to which it is to be connected. ALL duct work joints must be taped to prevent moisture and
lint from escaping into the building. Inspection doors should be installed at strategic points in the exhaust
duct work for periodic inspection and clean-out of lint from the duct work.
Vertical Venting:
When single dryer venting is used the length of the duct work from the dryer to the outside exhaust outlet
should not exceed twenty (20) feet. The minimum diameter of this duct work must be at least 12-inches
(even though the dryer exhaust duct for gas and electric units is only 8-inches) In the case of multiple
(common) dryer venting, the distance from the last dryer to the outside exhaust outlet should not exceed
twenty (20) feet. The shape of the duct work is not so critical so long as the minimum cross sectional area is
provided. It is suggested that the use of 90º turns be avoided; use 30º and/or 45º bends instead.. The
radius of the elbows should preferably be 1-1/2 times the diameter of the duct. ALL duct work should be
smooth inside with no projections from sheet metal screws or other obstructions which will collect lint.
When adding ducts, the duct to be added should overlap the duct to which it is to be connected. ALL duct
work joints must be taped to prevent moisture and lint from escaping into the building. Inspection doors
should be installed at strategic points in the exhaust duct work for periodic inspection and clean-out of lint
from the duct work.
IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct should not
exceed 0.3-inches of water column.
14
IMPORTANT: 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 opening.
a. Outside Duct Work Protection
1) To protect the outside end of horizontal duct work from the weather, a 90° elbow bent
downward should be installed where the exhaust exits the building. If the duct work
travels vertically up through the roof, it should be protected from the weather by using
a 180° turn to point the opening downward. In either case, allow at least twice the diameter of the
duct between the duct opening and the nearest obstruction.
IMPORTANT: DO NOT use screens or caps on the outside of opening of exhaust duct work.
2. Single Dryer Venting
Where possible, it is suggested to provide a separate exhaust duct for each dryer. The exhaust duct should
be laid out in such a way that the duct work travels as directly as possible to the outdoors with as few turns
as possible. It is suggested that the use of 90° turns in the ducting be avoided; use 30° and/or 45° angles
instead. The shape of the exhaust duct work is not critical so long as the minimum cross section area is
provided.
IMPORTANT: Minimum duct size for a dryer that is vented horizontally is 10-inches for a round
duct or an equivalent of 80 square inches. The DUCT SIZE MUST NOT BE
REDUCED ANYWHERE DOWN STREAM OF THE DRYER.
IMPORTANT: Exhaust back pressure measured by a manometer at each basket (tumbler) exhaust
duct area should not exceed 0.3-inches of water column.
IMPORTANT: 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.
15
IMPORTANT: 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 (HVAC)
firm should be consulted for proper venting information.
ALL duct work should be smooth inside with no projections from sheet metal screws or other
obstructions which will collect lint. When adding ducts, the duct to be added should overlap the duct to
which it is to be connected. ALL duct work joints must be taped to prevent moisture and lint from
escaping into the building. Inspection doors should be installed at strategic points in the exhaust duct
work for periodic inspection and clean-out of lint from the duct work.
NOTE: Where the exhaust duct 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 opening.
a. Outside Duct Work Protection
1) To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward
should be installed where the exhaust exits the building. If the duct work travels vertically up
through the roof, it should be protected from the weather by using a 180° turn to point the opening
downward. In either case, allow at least twice the diameter of the duct between the duct opening and
the nearest obstruction.
IMPORTANT: DO NOT use screens or caps on the outside of opening of exhaust duct work.
16
3. Multiple Dryer (common) Venting
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 least 38-1/4 inches apart.
The main duct should be tapered, with the diameter increasing before each individual duct (10-inch
minimum) is added.
IMPORTANT: No more than four (4) dryers should be connected to main common duct.
The main duct may be any shape so long as the minimum cross sect is provided. The illustration on page xx
shows the minimum cross section area for multiple dryer round or square venting. These figures must be
increased 10 square inches when rectangular main ducting is used, and the ration of duct width to depth
should not be greater than 3-1/2 to 1. These figures must be increased in proportion if the main duct run
from the last dryer to where it exhausts to the outdoors is unusually long (over fifteen [15] feet) or has
numerous (more than two [2] elbows in it). In calculating duct work size, the cross section area of a square
or rectangular duct must be increased twenty (20) percent for each additional fifteen (15) feet. The
diameter of a round exhaust must be increased ten (10) percent for each additional fifteen (15) feet. Each
90º elbow is equivalent to an additional thirty (30) feet and each 45º elbow is equivalent to an additional
fifteen (15) feet.
IMPORTANT: For extended duct work runs, the cross section area of the duct work can only be
increased to an extent. Maximum proportional duct work runs cannot exceed fifteen
(15) feet with two (2) elbows. When the duck work approaches the maximum limits
as noted in this manual, a professional HVAC firm should be consulted for proper
venting. HVAC should be consulted for proper venting information.
The duct work should be smooth inside with no projections from sheet metal screws or other obstructions
which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be
connected. ALL duct work joints must be taped to prevent moisture and lint from escaping into the
building. Inspection doors should be installed at strategic points in the exhaust duct work for periodic
inspection and clean-out of lint from the duct work.
NOTE: Where the exhaust 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 opening.
a. Outside Duct Work Protection
1) To protect the outside end of horizontal duct work from weather, a 90º elbow bent downward should be
installed where the exhaust exits the building. If the duct work travels vertically up through the roof, it
should be protected from the weather by using a 180º turn to point the opening downward. In either
case, allow at least twice the diameter of the duct between the duct opening and the nearest obstruction.
IMPORTANT: DO NOT use screens or caps on the outside of opening of exhaust duct work.
17
18
F. ELECTRICAL INFORMATION
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, material, and
workmanship must conform to the applicable requirements of the National Electrical 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.
NOTE: Component failure due to improper installation will VOID THE WARRANTY.
Each dryer should be connected to an independently protected branch circuit. The dryer must be
connected with copper wire only. DO NOT use aluminum wire which could cause a fire hazard. The
copper conductor wire/cable must be of proper ampacity and insulation in accordance with electric
codes for making all service connections.
NOTE: The use of aluminum wire will VOID THE WARRANTY.
IMPORTANT: A separate circuit servicing each dryer must be provided.
19
2. ELECTRICAL SERVICE SPECIFICATIONS
A. Gas and Steam Models
MLG-75 (Gas)
MLS-75 (Steam)
ELECTRICAL SERVICE SPECIFICATIONS (PER DRYER)
IMPORTANT: 208 VAC and 230/240 VAC ARE NOT THE SAME. When ordering, specify exact voltage.
NOTE:
A. Fuse ratings are dual-element, time-delay, current limiting, class RK1 or RK5 ONLY.
B. Circuit breakers are thermal magnetic (industrial) type ONLY. For others, calculate/verify correct breaker
size according to appliance amp draw rating and type of breaker used.
C. Circuit breakers for 3Ø dryers must be 3-pole type.
WIRE
APPROX.
MINIMUM
SERVICE AMP DRAW WIRE SIZE*
SERVICE
VOLTAGE
PHASE
120 (60 Hz)
1
2
13
208 (60 Hz)
1
2
208 (60 Hz)
3
240 (50/60 Hz)
240 (50/60 Hz)
FUSING
Dual Element
Time Delay
CIRCUIT
BREAKER
10
20
25
8
14
12
15
3/4
5
14
8
15
3
3/4
5
14
8
15
1
2
7
14
12
15
380-400 (50 Hz)
3
3/4
3
14
5
15
416 (50 Hz)
3
3/4
3
14
5
15
460 (60 Hz)
3
3/4
3
14
5
15
* AWG Stranded Wire ... for individual lenghts less than 100 feet.
IMPORTANT: Figures shown are for non-reversing models ONLY. For reversing models contact the
factory.
IMPORTANT: 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 VAC or
230/240 VAC, the supply voltage must match the electric service specifications of
the data label exactly.
IMPORTANT: The wire size must be properly sized to handle the related current.
WARNING: 208 VAC and 230/240 VAC ARE NOT THE SAME. Any damage done to dryer
components due to improper voltage connections will automatically VOID THE
WARRANTY.
NOTE: ADC reserves the right to make changes in specifications at any time, without notice or
obligation.
20
B. Electric Models Only
MLE-75 (Electric)
ELECTRICAL SERVICE SPECIFICATIONS (PER DRYER)
IMPORTANT: 208 VAC and 230/240 VAC ARE NOT THE SAME. When ordering, specify exact voltage.
NOTE:
A. Fuse ratings are dual-element, time-delay, current limiting, class RK1 or RK5 ONLY.
B. Circuit breakers are thermal magnetic (industrial) type ONLY. For others, calculate/verify correct breaker size according to appliance amp draw rating and type
of breaker used.
C. Circuit breakers for 3Ø dryers must be 3-pole type.
APPLIED VOLTAGE/PHASE
20
24
30
33
36
40
208/1ø (60 Hz) 240/1ø (50/60 Hz) 208/3ø (50/60 Hz)
APPROX.
AMP DRAW
KW
240/3ø (50/60 Hz)
380/3ø (50 Hz)
416/3ø (50 Hz)
460/3ø (60 Hz)
105
90
---
-- -
33
---
---
-- -
---
72
63
-- -
36
33
-- -
---
88
77
-- -
45
41
-- -
---
---
-- -
53
---
---
-- -
---
104
92
-- -
53
48
-- -
---
---
-- -
-- -
59
---
IMPORTANT: Figures shown are for non-reversing models ONLY. For reversing models contact the
factory.
IMPORTANT: 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 VAC or
230/240 VAC, the supply voltage must match the electric service specifications of
the data label exactly.
IMPORTANT: The wire size must be properly sized to handle the related current.
WARNING: 208 VAC and 230/240 VAC ARE NOT THE SAME. Any damage done to dryer
components due to improper voltage connections will automatically VOID THE
WARRANTY.
NOTE: ADC reserves the right to make changes in specifications at any time, without notice or
obligation.
IMPORTANT: 3 phase figures shown are for a 3 wire service ONLY.
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/NFPA NO. 70-LATEST EDITION. The ground connection may be to a proven
earth ground at the location service panel.
For added personal safety, when possible, it is suggested that a separate ground wire (no. 18 minimum)
be connected from the ground connection of the dryer to a grounded cold water pipe. DO NOT ground
to a gas pipe or hot water pipe. The grounded cold water pipe must have metal to metal connection
all the way to the electrical ground. If there are any non-metallic interruptions, such as, a meter, pump,
plastic, rubber, or other insulating connectors, they must be jumped out with no. 4 copper wire and
securely clamped to bare metal at both ends.
IMPORTANT: For personal safety and proper operation, the dryer must be grounded.
Provisions are made for ground connection in each dryer at the electrical service connection area.
4. ELECTRICAL CONNECTIONS
NOTE: A wire diagram is located in the front electrical control box for connection data.
a. Gas and Steam Models ONLY
NOTE: A CIRCUIT SERVING EACH DRYER MUST BE PROVIDED.
1) Single Phase (1Ø) Wiring Connections (Hookup)
The electrical connections on ALL Single-phase (1 Ø) gas and steam dryers are made into the
rear service box located at the upper left area of the dryer.
22
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 provided in this
box.
Single-Phase (1Ø) Electrical Connections Leads
Black
+
Positive
White
+
Neutral
Green
+
Ground
or
L2
If local codes permit, power to the dryer can be made by the use of a flexible U.L. listed power cord/pigtail (wire
size must conform to rating of dryer), or the dryer can be hard wired directly to the service breaker panel. In both
cases, a strain relief must be installed where the wiring enters the dryer.
2) 3 Phase (3 Ø) Wiring Connections / Hookup "NON-REVERSING MODELS ONLY"
The electrical connections on ALL three-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 the dryer.
NOTE: A CIRCUIT SERVING EACH DRYER MUST BE PROVIDED.
If local codes permit, power to a gas or steam dryer can be made by the use of a flexible U.L. listed power cord/
pigtail (wire size must conform to rating of dryer), or the dryer can be hard wired directly to the service breaker
panel. In all cases, a strain relief must be installed where the wiring enters the dryer.
23
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 at three phase (3Ø), the electrical connections
are made at the power distribution block located in the service box at the rear, upper left corner of the
dryer. The ground connection is made to the copper lug also provided in this box. To gain access to the
service box contactor, the service box cover must be removed.
24
3) 3-Phase Wiring 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 the dryer.
IMPORTANT: A separate circuit serving each dryer must be provided.
If local codes permit, power to a gas or steam dryer can be made by the use of flexible U.L. listed power cord/
pigtail (wire size must conform to rating of dryer), or the dryer can be hard wired directly to the service breaker
panel. In all cases, a strain relief must be installed where the wiring enters the dryer.
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 input connection
is required on a three phase (3Ø) dryer.
For gas and steam dryers manufactured for operation at
three phase (3Ø), the electrical connections are made at
the power distribution block located in the service box at
the rear, upper left corner of the dryer. The ground
connection is made to the copper lug also provided in this
box. To gain access to the service box contactor, the
service box cover must be removed.
25
b) ELECTRICALLY Heated Models ONLY
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 present) is done internally to the dryer by the factory at the oven contactor.
No single phase (1 Ø) input connection is required on a 3-phase (3 Ø) dryer.
CAUTION: The dryer must be grounded. A ground lug has been provided for this purpose.
Input connection wiring must be sized properly to handle the dryer's current draw. This
information is printed on the dryers data label.
IMPORTANT: A separate circuit serving each dryer must be provided.
The electrical input connections are made at the electric oven contactor located inside the
assembly at the rear center upper section of the dryer. The ground connection is made to a
copper lug also provided in this area. To gain access, remove oven rear service cover.
IMPORTANT: A strain relief must be used where the input wiring enters the oven assembly.
26
G. GAS INFORMATION
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 requirements of
the National Fuel Gas Code ANSI Z223.1-LATEST EDITION.
IMPORTANT: Failure to comply with these codes or ordinances, and/or the requirements
stipulated in this manual, can result in PERSONAL INJURY and IMPROPER
OPERATION of the dryer.
The dryer and its individual shut-off valves must be disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa). The dryer must be isolated from
the gas supply piping system by closing its individual manual shut-off valve during any pressure test of the gas
supply system at test pressures equal to or less than 1/2 psig (3.5 kPa).
IMPORTANT: Failure to isolate or disconnect the dryer from supply as noted can cause
irreparable damage to the gas valve VOIDING THE WARRANTY.
WARNING: FIRE or EXPLOSION COULD RESULT.
1. Gas Supply
The gas dryer installation must meet the American National Standard...National Fuel Gas Code ANSI Z223.1LATEST EDITION, as well as local codes and ordinances and must be done by a qualified professional.
NOTE: Undersized gas piping will result in ignition problems, slow drying, increased use of
energy, and can create a safety hazard.
The dryer must be connected to the type of heat/gas indicated on the dryer label affixed behind the right control
box door. If this information does not agree with the type of gas available, DO NOT operate the dryer.
Contact the distributor who sold the dryer or the ADC factory.
IMPORTANT: Any burner changes or conversions must be made by a qualified professional.
The input ratings shown on the 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 or
conversion of dryers in the field for elevations over 2,000 feet are made by changing each burner orifice. If this
conversion is necessary, contact the distributor who sold the dryer or contact the ADC factory.
27
2. TECHNICAL GAS DATA
a. Gas Specifications
Type of Gas
Natural
Liquid Propane
3.5 inches W.C.
10.5 inches W.C.
6.0 - 12.0 inches W.C.
10.5 inches W.C.
Manifold Pressure
Inline Pressure
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
must be consistent between a minimum of 6.0 inches and a maximum of 12.0 inches water
column pressure.
2) Liquid Propane (L.P.) Gas
Dryers made for use with L.P. gas have the gas valve's internal pressure regulator
blocked open so that the gas pressure must be regulated upstream of the dryer. The
pressure measured at each gas valve pressure tap must be a consistent 10.5 inches
water column. There is no regulator or regulation provided in an L.P. dryer. The water
column pressure must be regulated at the source (L.P. tank) or an external regulator
must be added to each dryer.
Type of Gas
Natural
Liquid Propane
Model
Number
BTU Per
Hour
Rating
Qty.
D.M.S.*
Part
Number
Qty.
D.M.S.*
Part
Number
MLG-75
200,000
4
#29
140820
4
#47
140805
* D.M.S. (Drill Material Size of equivalents are as follows:)
Natural Gas ................... # 29 = .1360"
Liquid Propane Gas ...... # 47 = .0785"
28
L.P.
Conversion
Kit Part
Number
881231
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 located at the right side of the base of the
dryer. The minimum pipe size (supply line) to the dryer is 3/4" N.P.T. For ease in servicing, the gas supply
line of each dryer must have its own shut-off valve.
The size of the main gas supply line (header) will vary depending on the distance this line travels from the
gas meter or, in the case of L.P. (liquid propane) gas, the supply tank, other gas-operated appliances on the
same line, etc. Specific information regarding supply line size should be determined by the gas supplier.
NOTE: Undersized gas supply piping can create a low or inconsistent pressure which will result in
erratic operation of the burner ignition system.
29
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 test pressure of 3.5 inches for natural gas and 10.5 inches for L.P. (liquid
propane) dryers is required at the gas valve pressure tap of each dryer for proper and safe
operation.
A 1/8" N.P.T. plugged tap, accessible for a test gauge connection, must be installed in the main gas supply
line immediately upstream of each dryer.
IMPORTANT: Pipe joint compounds that resist the action of natural gas and L.P. gas must be used.
IMPORTANT: Test ALL connections for leaks by brushing on a soapy water solution (liquid
detergent works well).
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
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.
IMPORTANT: The dryer and its individual shut-off valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess of
1/2 psig (3.5 kPa).
NOTE: The dryer must be isolated from the gas supply piping system by closing its individual manual
shut-off valve during any pressure test of the gas supply system at test pressures equal to or
less than 1/2 psig (3.5 kPa).
H. STEAM INFORMATION
It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the
steam plumbing installation is adequate and conforms with local and state regulations or codes.
IMPORTANT: Failure to comply with the requirements stipulated in this manual can result in
component failure which will VOID THE WARRANTY.
NOTE: The MLS-75 is manufactured with a pneumatic (piston) damper system which requires an
external supply of air (80 PSI +/- 10 PSI).
1. Steam Coil PH Level
The normal PH level for copper type steam coils must be maintained between a value of 8.5 to 9.5.
For steel type steam coils the PH level must be maintained between a value of 9.5 to 10.5. These
limits are set to limit the acid attack of the steam coils.
IMPORTANT: Coil failure due to improper PH level will VOID THE WARRANTY.
30
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
Operating Steam Pressure
Maximum
125 psig
Minimum
100 psig*
Heat Input (Normal Load)
7 Bhp
Consumption (Approximate)
239 lbs/hr
3. Installation Instructions
To insure an adequate supply of steam is provided, be sure that the steam lines and steam return lines are
sized and laid out as stipulated in this manual. Inadequate steam lines and steam return lines or improper
steam plumbing will result in poor performance and can cause component failure. Clean, dry steam must be
provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam will VOID THE WARRANTY.
a. The pressure of the condensate in the steam supply will cause water hammer and subsequent heat
exchanger (steam coil) failure. The steam supply connection into the main supply line must be made with
a minimum 10-inch riser. This will prevent any condensate from draining towards the dryer.
b. The steam supply piping to the dryer must include a 12-inch rise along with a drip trap and check valve.
This will prevent any condensate from entering the steam coil.
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.
This will allow the dryer to be isolated from the supply main and the return main if the dryer needs
maintenance work.
e. Install an inverted bucket steam trap and check valve at least 12-inches below the steam coil as close to the
coil as possible.
1) A trap with capacity of 700 pounds of condensate per hour at 125 psi is needed for each unit.
f. The supply line and the return line should be insulated. This will save energy and provide for the safety of
the operator and maintenance personnel.
31
g. Water 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 any low point to eliminate wet steam.
IMPORTANT: Flexible hose/coupling must be used. Coil Failure due to hard plumbing
connections will VOID THE WARRANTY.
32
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
Compressed Air Supply
Air Pressure
Normal
80 psi
Minimum Supply
70 psi
Maximum Supply
90 psi
b. Air Connection
Air connection to system --- 1/8-inch N.P.T.
c. No air regulator or filtration is provided with the dryer. External regulation/filtration of 80 psi must be
provided. It is suggested that a regulator/filter gauge arrangement be added to the compressed air line just
before the dryer connection. This is necessary to insure that correct and clean air pressure is achieved.
33
4. STEAM DAMPER SYSTEM OPERATION
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 is closed, ambient air is drawn directly into the tumbler, allowing a rapid cool down
(Diagram 2).
Diagram 1 shows the damper in the heating (open) mode, allowing heat into the tumbler.
Diagram 2 shows the damper in the cool down (closed) mode, pulling ambient air directly into the
tumbler without passing through the coils.
NOTE: With the dryer off or with no air supply, the steam damper is in cool down mode as shown in
Diagram 2.
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 for instructions to check
steam damper operation. If steam damper adjustment is necessary, locate the flow control valve and make the
necessary adjustments as noted below.
35
I. PREPARATION FOR OPERATION/START-UP
The following items should be checked before attempting to operate the dryer:
1. Read ALL "CAUTION," "WARNING," 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 affixed to
the back side of the top front control/service door. In the case of 208 VAC or 230/240 VAC, THE
SUPPLY VOLTAGE MUST MATCH THE ELECTRIC SERVICE EXACTLY.
3. GAS MODELS - check to assure that the dryer is connected to the type of heat/gas indicated on the
dryer data label.
4. GAS & ELECTRIC MODELS - the sail switch damper assembly was installed and adjusted at the
factory prior to shipping. However, each sail switch adjustment must
be checked to assure that this important safety control is functioning.
(refer to page 37 for Sail Switch Adjustment)
5. GAS MODELS - be sure that ALL gas shut-off valves are in the open position.
6. Be sure ALL side and base panels are on the dryer.
7. Check ALL service doors to insure that they are closed and secure.
8. Be sure the lint door is securely in place.
9. Rotate the basket (tumbler/drum) by hand to be sure it moves freely.
10. Check bolts, nuts, screws, terminals, and fittings for security.
11. STEAM MODELS - check to insure air supply (80 PSI) is connected to the dryers.
12. STEAM MODELS - check to insure ALL steam shut-off valves are open.
13. STEAM MODELS - check steam damper operation.
14. Check tumbler bearing set screws to insure they are ALL tight.
36
J. PREOPERATIONAL 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. Turn on electric power to the dryer.
a. Open ALL shut-off valves (Gas Models Only)
2. Refer to the Operating Instructions for starting your particular model dryer.
3. Gas Dryers
a. When a gas dryer is first started (during initial start-up), it has a tendency not to ignite
on the first ignition attempt. This is because the gas supply piping is filled with air, so
it may take a few minutes for the air to be purged from the lines.
NOTE: During the purging period, check to be sure that ALL gas shut-off valves are open.
NOTE: Gas dryers are equipped with a Hot Surface Ignition (HSI) system which has internal
diagnostics. If ignition is not established within three times, the heat circuit in the HSI module
will lock out until it is manually reset. To reset the HSI system, open and close the main door
and restart the dryer.
b. A gas pressure test should be taken at the gas valve pressure tap of each dryer to assure
that the water column pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the pressure tap of the gas valve body):
Natural Gas .......... 3.5 - 4.0 Inches Water Column
L.P. Gas ................ 10.5-11.0 Inches Water Column
IMPORTANT: There is no regulator provided in an L.P. dryer. The water column pressure must be
regulated at the source (L.P. tank), or an external regulator must be added to each
dryer.
Steam Dryers
a. Check to insure that steam damper is functioning properly.
1. The steam damper should not "slam" (open or closed) when it reaches the end of (piston) travel.
Additionally, the steam damper should not bind and/or stop during travel. If either of these
conditions occur, the flow control must be adjusted. Refer to the bottom illustration on page 34
for air adjustment instructions.
37
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: To check for proper sail switch operation (for Gas & Electric Models Only), open the
main door and while holding main door switch plunger in, start dryer. Dryer should start
but heat circuit should not be activated (on). If the heat system is activated, the sail
switch is improperly adjusted and must be adjusted by bending the actuator arm of the
sail switch toward the burner box. If the actuator arm is bent too far toward the burner box
of the dryer, the dryer may not have heat when needed. After any adjustment to the sail
switch, the above procedure must be repeated to verify proper operation of the sail
switch.
5. The dryer should be operated through one (1) complete cycle to assure that no further adjustments are
necessary and that ALL components are functioning properly.
IMPORTANT: The dryer basket (tumbler) is treated with a protective coating. ADC suggests
tumbling old clothes or material in the basket (tumbler), using a mild detergent
to remove the protective coating.
6. Make a complete operational check of ALL operating controls.
a. For Microprocessor model check controller (computer) programs/selections...
1) Each microprocessor controller (computer) has been preprogrammed by the factory with the
most commonly used parameter (program) selections. If computer program changes are required,
refer to the computer programming manual which was shipped with the dryer.
7. Check the electric service phase sequence (three-phase [3ø] models only). While the dryer is operating,
check to see if the blower wheel (impeller/fan) is rotating in the proper direction. Looking from the front, the
blower wheel (impellor/fan) should spin in the clockwise direction. If it is, the phasing is correct. If the phasing
is incorrect, reverse two (2) of the three (3) leads at connections L1, L2, L3 of the power supply to the dryer.
IMPORTANT: If the blower wheel (impellor/fan) is rotating in the wrong direction, this will not
only drastically reduce drying efficiency, but it can also cause premature
component failure.
38
8. REVERSING MODELS ONLY - 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 Automatic Mode and have been preprogrammed into the
microprocessor controller (computer) for 150-seconds spin time in forward direction, 120-seconds in
the reverse direction and a 5-second dwell (stop) time.
2. Spin and stop times are adjustable in the Manual (timed) Mode.
b. Dual Timer Models
1. Both dwell (stop) and basket (tumbler) spin time are adjustable. (refer to illustration on page 49.)
9. Check to insure that ALL set screws (i.e., tumbler drive, idler, etc.) are tight.
K. PREOPERATIONAL INSTRUCTIONS
1. To start the dryer:
a. Microprocessor (computer) dryers
1. The L.E.D. display will read "REAdY".
2. Press the "E" on the touch pad of the keyboard.
3. The dryer will start and the display will flash "dRYING MANUAL CYCLE E"
"dRY TEMP 180F" "COOL TEMP 80F" "30 REMAIN" "dRUM TEMP"
Refer to the User's Manual for detailed operating instructions.
b. Dual Timer Dryers
1. Turn drying timer knob for a time of 20 minutes.
2. Select "High Temp."
3. Push "Push To Start" Switch.
4. To stop dryer, open the main door.
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. GAS MODELS ... discontinue the gas supply.
1) SHUT OFF external gas supply shut-off valve.
2) SHUT OFF internal gas supply shut-off valve located in the gas valve burner area.
b. STEAM MODELS ... discontinue the steam supply.
1) SHUT OFF external (location furnished) shut-off valve.
2) SHUT OFF internal steam valves in the supply lines and the return lines.
40
SECTION IV
SERVICE/PARTS INFORMATION
A. SERVICE
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 distributor in your area.
NOTE: When contacting the ADC Service Department, be sure to give them the correct model
number and serial number so that your inquiry is handled in an expeditious manner.
B. PARTS
1. Replacement parts should be purchased from the distributor from whom the ADC equipment was
purchased. If the distributor cannot be contacted or is unknown, contact the ADC Parts Department for a
distributor in your area. Parts may also be purchased directly from the factory by calling the ADC Parts
Department at (508) 678-9010 or you may FAX in your order at (508) 678-9447.
NOTE: When ordering replacement parts from the ADC dealer or the ADC factory be sure to
give them the correct model number and serial number so that your parts order can be
processed in an expeditious manner.
41
SECTION V
WARRANTY INFORMATION
A. RETURNING WARRANTY 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 serve you, if you file a warranty
claim.
a. If a warranty card (ADC Part No. 112254) did not come with your dryer, contact the ADC Warranty
Department or ADC Service Department at (508) 678-9000.
B. PARTS
For a copy of the ADC commercial warranty covering your particular dryer(s), contact the ADC distributor from
whom you purchased the equipment and request dryer warranty form ADC Part No. 450199. If the distributor
cannot be contacted or is unknown, warranty information can be obtained from the factory by
contacting the ADC Warranty Department at (508) 678-9000.
NOTE: Whenever contacting the ADC factory for warranty or warranty information, be sure to have
the dryer's model number and serial number available so that your inquiry can be handled in
an expeditious manner.
C. RETURNING WARRANTY PARTS
ALL dryer or parts warranty claims or inquiries should be addressed to the ADC Warranty Parts Department.
To expedite processing, the following procedures must be followed:
1. No parts are to be returned to ADC without prior written authorization ("Return Material Authorization")
from the factory.
NOTE: An R.M.A. ("Return Material Authorization") is valid for only sixty (60) days from date of
issue.
a. The R.M.A. issued by the factory, as well as any other correspondence pertaining to the returned part(s),
must be included inside the package with the failed merchandise.
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.
NOTE: If a part is marked for a credit or a refund, the invoice number covering the purchase of
the replacement part must be provided.
NOTE: Warranty tags (ADC Part No. 450064) are available at "no charge" from ADC upon
request.
3. The company returning the part(s) must clearly note the complete company name and address on the
outside of the package.
4. ALL returns must be properly packaged to insure that they are not damaged in transit. Damage claims
are the responsibility of the shipper.
IMPORTANT: No replacements, credits or refunds will be issued for merchandise damaged in
transit.
5. ALL returns should be shipped to the ADC factory in such a manner that they are insured and a proof of
delivery can be obtained by the sender.
6. Shipping charges are not the responsibility of ADC. ALL returns should be "prepaid" to the
factory. Any "C.O.D." or "COLLECT" returns will not be accepted.
IMPORTANT: No replacements, credits, or refunds will be issued if the claim cannot be
processed due to insufficient information. The party filing the claim will be
notified in writing, either by "FAX" or "CERTIFIED MAIL - Return Receipt
Requested", as to the information necessary to process claim. If a reply is not
received by the ADC Warranty Department within thirty (30) days from the
FAX/letter date, then no replacement, credit, or refund will be issued, and the
merchandise will be discarded.
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. 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.
WARNING: LINT FROM MOST FABRICS IS HIGHLY COMBUSTIBLE. THE
ACCUMULATION OF LINT CAN CREATE A POTENTIAL FIRE HAZARD.
WARNING: KEEP DRYER AREA CLEAR AND FREE FROM COMBUSTIBLE
MATERIALS, GASOLINE, and OTHER FLAMMABLE VAPORS and
LIQUIDS.
NOTE: Suggested time intervals shown are for average usage which is considered six (6) to eight
(8) operational (running) hours per day.
SUGGESTED CLEANING SCHEDULE
EVERY THIRD or FOURTH LOAD
Clean the lint screen every third or fourth load. A clogged lint screen will cause poor dryer performance. The
lint screen is located behind the lint door in the base of the dryer. Open the lint door, brush the lint off the lint
screen, and remove the lint. Inspect lint screen and replace if torn.
NOTE: The frequency of cleaning the lint screen can best be determined from experience at each
location.
WEEKLY
Clean lint accumulation from lint chamber, thermostat, and microprocessor temperature sensor (sensor bracket)
area.
WARNING: TO AVOID THE HAZARD OF ELECTRICAL SHOCK, DISCONTINUE
ELECTRICAL SUPPLY TO THE DRYER.
44
STEAM MODELS - clean the steam coil fins. We suggest using compressed air and a vacuum cleaner with
brush attachment.
WARNING: 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 DAYS
1. Remove lint from around basket (tumbler), drive motors, and surrounding areas.
2. Remove lint from gas valve burner area with a dusting brush or vacuum cleaner attachment.
3. Clean any lint accumulation in and around both the blower and drive motor casing openings.
NOTE: To prevent damage, avoid cleaning and/or touching ignitor/flame-probe assembly.
EVERY 6 MONTHS
Inspect and remove lint accumulation in customer furnished exhaust duct work system and from dryers
internal exhaust ducting.
NOTE: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
NOTE: DO NOT OBSTRUCT THE FLOW OF COMBUSTION and VENTILATION AIR.
CHECK CUSTOMER FURNISHED BACK DRAFT DAMPERS IN THE EXHAUST
DUCT WORK. INSPECT and REMOVE ANY LINT ACCUMULATION WHICH
CAN CAUSE THE DAMPER TO BIND or STICK.
NOTE: A back draft damper that is sticking partially closed can result in slow drying and shutdown of
heat circuit safety switches or thermostats.
NOTE: When cleaning the dryer cabinet(s), avoid using harsh abrasives. A product intended for the
cleaning of appliances is recommended.
B. ADJUSTMENTS
7 DAYS AFTER INSTALLATION and EVERY 6 MONTHS THEREAFTER
Inspect bolts, nuts, screws, (bearing set screws), non-permanent gas connections (unions, shut-off valves,
orifices, and grounding connections). Motor and drive belts should be examined. Cracked or seriously
frayed belts should be replaced. Tighten loose V-belts when necessary. Complete operational check of
controls and valves. Complete operational check of ALL safety devices (door switches, lint drawer switch,
sail switch, burner and hi-limit thermostats).
45
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. Verify that the motor(s) and the heat indicator dots, in the microprocessor (computer) L.E.D.
display are on. (Refer to the illustration below.)
1.Basket (tumbler) in Forward Mode (clockwise)
2.Basket (tumbler) in Reverse Mode (counterclockwise) indicator (for Reversing Models Only)
3.Heat on indicator
4.On indicator (dryer is in Operation Mode)
46
Verify 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. "FAN" (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 (for optional Reversing Models Only)
4. "HT 1" (Heat) output L.E.D. indicator
5. "Fuse" (Main Fuse) input L.E.D. indicator
6. "Lint" (Lint Door) input L.E.D. indicator
7. "Main" (Main Door) input L.E.D. indicator
8. "Drum" (Tumbler Hi-Limit) input L.E.D. indicator
9. "Sail" (Sail Switch) input L.E.D. indicator
10. "Burn" (Burner Hi-Limit) input L.E.D. indicator
11. "Flame" (Burner Control Failure) input L.E.D. indicator
12. "Power Supply" L.E.D. Input Indicator
47
d. Open main door. The dryer must stop and ALL output indicator lights on the back side of the microprocessor (computer) board must go out. (Refer to the illustration on previous page [page 46].)
e. Try to restart the dryer with the main door open.
f. The microprocessor (computer) board's L.E.D. display must read "DOOR."
g. Close the main door and restart the dryer.
h. Functional check of microprocessor (computer) board is complete.
2. Hot Surface Ignition (HSI) System
a. Upon completing installation of the
replacement Hot Surface Ignition (HSI)
module, reestablish power to the dryer.
b. The HSI module's "red" indicator light
will light up for approximately 5
seconds (self check routine).
If the HSI module's "red" indicator light
stays on or flashes continuously, then the
HSI module is wired incorrectly or has failed.
c. Start the drying cycle.
d. The hot surface ignitor will turn on. After approximately 4 seconds the glo-bar will shut off and the gas
valve will be energized. The flame should now be established.
e. With the burner flame on, remove the flame sensor wire from the S2 terminal of the HSI module. The
burner flame must shut off immediately.
f. Stop the drying cycle, with the flame sensor wire still removed, restart the drying cycle.
g. The hot surface ignitor will turn on and after approximately 4 seconds the hot surface ignitor will shut off.
The gas valve will be energized and a burner flame should be evident for approximately 7 seconds and
then shut off.
h. The HSI module will attempt two (2) additional ignition trials after which the HSI module will lock out and
the "red" indicator light will flash continuously.
i. Functional check of the Hot Surface Ignition (HSI) Module is complete.
1) Replace the flame sensor wire from the S2 terminal to the HSI module.
48
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 timer (as noted in the illustration below).
Timing Legend
Spin Time
Switch Position Number
1
2
3
4
5
30
60
90
120
150
Dwell (Stop) Time
1
2
3
4
5
Switch Position Number
5
6
8
10
12
Time in Seconds*
dd
Time in Seconds*
* Values shown are +/- 1 second.
49
SECTION IX
TECHNICAL INFORMATION
A. DATA LABEL
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 please have the model number and serial number available.
50
THE DATA LABEL
1. MODEL DRYER
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. MANUFACTURING CODE NUMBER
The manufacturing code number is a number issued by ADC which describes
ALL possible options on your particular model.
4. TYPE OF HEAT
The type of heat describes the type heat for your particular dryer; gas (either natural
gas or liquid propane [L.P.]), or steam.
5. HEAT INPUT (for GAS DRYERS)
This describes the heat input in British Thermal Units per Hour (BTUH).
6. ORIFICE SIZE (for GAS DRYERS)
Gives the number drill size used.
7. ELECTRIC SERVICE
This describes the electric service for your particular model.
8. GAS MANIFOLD PRESSURE (for GAS DRYERS)
This describes the manifold pressure taken at the gas valve tap.
9. APPLICABLE APPROVAL SEAL(S)
I.E., American Gas Association, Canadian Gas Association.
51
ADC 113001
1- 09/11/97-50
4* 08/11/98-100
7- 01/03/00-200
2* 01/12/98-50
5* 12/07/98-100
3- 04/16/98-50
6- 09/21/99-100
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