MD-170
Installation/Operator's 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 contact:
Maytag Co.
403 West Fourth St North
Newton, Iowa 50208
(515) 787-7000
020800JEV/abe
ADC Part No. 113024
Retain This Manual In A Safe Place For Future Reference
Our 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 and 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. Manufacturer 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.
MD-170
DISTRIBUTORS NAME
Serial Number(s)
For replacement parts, contact the distributor from which the dryer was purchased or contact:
Maytag Co.
403 West Fourth St North
Newton, Iowa 50208
(515) 787-7000
“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 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
DRYERS SHOULD NEVER BE LEFT UNATTENDED WHILE IN OPERATION.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYERS.
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYERS 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 and SCREEN
IN PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and
specified in the installation and operator's manual included with the dryer.
Dryers must not be installed or stored in an area where it will be exposed to water 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 ........................................................................................................ 4
SECTION II
SUPER AD-30 SPECIFICATIONS .......................................................................... 6
A. SPECIFICATIONS (Gas and Steam Models) ............................................................................. 6
B COMPONENT IDENTIFICATION ........................................................................................... 8
SECTION III
INSTALLATION PROCEDURES ......................................................................... 10
A. LOCATION REQUIREMENTS .............................................................................................. 10
B. UNPACKING/SETTING UP .................................................................................................. 11
C. DRYER ENCLOSURE REQUIREMENTS ............................................................................. 13
D. FRESH AIR SUPPLY .............................................................................................................. 14
E. EXHAUST REQUIREMENTS ................................................................................................ 15
F. ELECTRICAL INFORMATION .............................................................................................. 21
G. GAS INFORMATION ............................................................................................................. 25
H. STEAM INFORMATION ....................................................................................................... 29
I. PREPARATION FOR OPERATION / START-UP ................................................................... 33
J. PREOPERATIONAL TESTS ................................................................................................... 34
K. SHUT DOWN INSTRUCTIONS ........................................................................................... 36
L. COMPRESSED AIR REQUIREMENTS ................................................................................. 37
SECTION IV
SERVICE / PARTS INFORMATION .................................................................... 38
A. SERVICE ................................................................................................................................. 38
B. PARTS ..................................................................................................................................... 38
SECTION V
WARRANTY INFORMATION .............................................................................. 39
A. RETURNING WARRANTY CARD(S) ................................................................................... 39
SECTION VI
ROUTINE MAINTENANCE .................................................................................. 40
A. CLEANING ............................................................................................................................ 40
B. ADJUSTMENTS ..................................................................................................................... 42
C. LUBRICATION ....................................................................................................................... 42
SECTION VII
TROUBLESHOOTING ........................................................................................... 43
SECTION VIII
REVERSING TIMER SPIN / DWELL ADJUSTMENTS .................................. 60
SECTION IX
DATA LABEL LOCATION/INFORMATION ...................................................... 61
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMONENTS .......................................................................................................... 63
SECTION XI
BURNER AND LINT (TUMBLER) CHAMBER MANUAL RESET
HI-LIMIT INSTRUCTIONS .............................................................................. 66
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.
The manufacturer assumes no responsibility for freight claims or damages.
6. If you need assistance in handling the situation, please contact the manufacturer's Traffic Manager at (508)
678-9000.
IMPORTANT: 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 the manufacturer 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,
or 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 tumbler (basket) 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 Electrical 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. 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 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.
5
SECTION II
SPECIFICATIONS / COMPONENT IDENTIFICATION
A. SPECIFICATIONS (GAS and STEAM)
Maximum Capacity (Dry Weight)
170 lbs.
77.1 kg
Basket Diameter
51-1/2"
130.8 cm
Basket Depth
42-1/2"
107.9 cm
Basket Motor
1 HP
.746 kw
Blower Motor
7-1/2 HP
5.6 kw
31-3/8"
79.7 cm
51.2 cu. ft.
1.45 cu. m.
Door Opening (Diameter)
Basket Volume
Dryers Per 20’/40’ Container
3/7
Dryers Per 45’ /48’ Truck
8/8
Voltage Available
550,000 btu/hr
138,600 kcal/hr
Approx. Weight (Uncrated)
1,900 lbs.
861.3 kg
Approx. Weight (Crated)
2,065 lbs.
936.1 kg
Airflow
3,700 cfm
104.75 cmm
Inlet Size
1-1/2"
3.81 cm
Compressed Air Connection
1/8" F.P.T.
---
Compressed Air Requirement
2.5 cfm @ 80 PSI
.007 cmm @ 552 kPa
Heat Input
Gas
208-600v / 3ø / 3, 4w 50/60 Hz
Steam
Voltage Available
208-600v / 3ø / 3, 4w 50/60 Hz
Approx. Weight (Uncrated)
2,050 lbs.
929.3 kg
Approx. Weight (Crated)
2,220 lbs.
1,006.3 kg
Heat Input
19 Bhp
Steam Consumption
725 lbs/hr
329.1 kg/hr
Airflow
4,400 cfm
124.56 cmm
Inlet Size
1-1/2"
3.81 cm
Return Size
1-1/2"
3.81 cm
Compressed Air Connection
1/8" F.P.T
---
Compressed Air Requirement
6 cfh @ 80 PSI
.017 cmm @ 552 kPa
Shaded areas are stated in metric equivalents
IMPORTANT: Gas dryers and steam dryers must be provided with a clean, dry, regulated 80 PSI
±10 PSI (552 kPa ± 0.69 kPa) air supply.
NOTE: The manufacturer reserves the right to make changes in specifications at any time, without
notice or obligation.
6
Specifications
MDG-170 (Gas)
MDS-170 (Steam)
NOTE: Operating height of steam dryer is 101-inches (256.54 centimeters).
NOTE: The manufacturer 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
6
7
8
Description
Microprocessor Control/Keyboard (Touchpad) Panel Assembly (Controls)
Control (top access) Door Assembly
Main Door Assembly
Lint Door Assembly
Lint Drawer
Wire Diagram (located Behind Control Door)
Top Console (Module) Assembly
Data Label and Installation Label
8
2. Dryer Rear View
Illus. No.
1
2
3
4
5*
6
7
8
9
10
11
Description
Basket (Drive) Motor Assembly
Blower Motor Mount Assembly
Idler Bearing Mount Assembly
Tumbler Bearing Mount Assembly
Electric Service Relay Box
Heating Unit
Data Label and Installation Label
1/8" Compressed Air Supply Inlet (Behind Gusset)
Side Access Opening
Front Access Opening
Impellor (fan/blower) Assembly
* Electric service connections are made in this 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:
ANSI.Z223.1-LATEST EDITION (National Fuel Gas Code)
and/or
ANSI/NFPA NO. 70-LATEST EDITION (National Electric Code)
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. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air Supply in
Section D).
4. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer
Enclosure Requirements in Section C).
5. 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).
6. Dryer must be exhausted to the outdoors (refer to Exhaust Requirements in Section E).
7. 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).
8. Dryer must be located in an area where correct exhaust venting can be achieved as noted in this 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) lag bolts securing the base of the dryer to the wooden skid. Two (2) are
located 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) lag bolts located in the lint chamber area, remove the lint drawer and the four
(4) Phillips head screws securing lint door in place.
1. Leveling Dryer
a. To level dryer, place 4-inch (10.16 cm) square metal shims or other suitable material under the base pads.
It is suggested that the dryer be tilted slightly to the rear (refer to illustration above).
2. The V-belts are disconnected from the basket drive motor for shipping. Reconnect V-belts before starting
the dryer.
a. To Reconnect V-belts ...
1) Remove hardware holding the back (belt) guard and remove guard from the dryer.
2) Lay one (1) belt into motor sheave (pulley) groove and wind belt into corresponding groove of idler
pulley by rotating the idler pulley by hand. Rotate the idler pulley an extra turn or two to insure that the
belt is tracking properly in the motor sheave (pulley) and idler pulley grooves without twisting.
11
3. If more headroom is needed when moving dryer into position, the top console (module) may be removed.
a. To Remove Top Console (Module)
1) Disconnect the ground wire (A) at the Rear Upper Left Hand
Corner of Dryer.
2) Remove the eight (8) set of
nuts and washers (B) holding
the console (module) to base.
3) Disconnect the white plug
connector (C) located on the top
of the rear electric service/
relay box (provides power to
the heat circuit).
4) Disconnect air connection from
the 3-way micro valve.
5) Lift the console (module) off of the dryer base.
IMPORTANT: The dryer must be transported and handled in an upright position at all times.
4. Exhaust Duct Work
NOTE: A Transition Piece for the exhaust is shipped
inside the tumbler (basket). This Transition Piece
is for locations with round exhaust duct work.
a. To install the Transition Piece, align the four (4) clinch studs
into the four (4) clearance holes on the dryer.
b. Using the four (4) free spin wash nuts (included with the
Transition Piece), tighten the wash nuts on to the clinch
studs which will secure the Transition Piece to the dryer.
c. The round duct can now be connected to the dryer.
12
C. DRYER ENCLOSURE REQUIREMENTS
Even though a 12-inch clearance is acceptable, it is recommended that the rear of the dryer be positioned
approximately two (2) feet from the nearest obstruction (i.e., wall) for ease of installation, maintenance, and
service. Bulkheads and partitions should be made from noncombustible materials. The clearance between the
bulkhead header and the dryer must be a minimum of 4-inches and must not extend more than 4-inches to the
rear of the dryer front. A 2-inch clearance is required between the bulkhead facing and the top of the dryer.
NOTE: Bulkhead facing should not be installed until after dryer is in place. Ceiling area must be
located a minimum of 6-inches above the dryer top console (module) for gas models and
8-inches for steam models.
Even though a minimum of 6-inches above the dryer console (module) is acceptable for gas
models and 12-inches above the dryer console (module) is acceptable for steam models, a
clearance of 12- inches or more (for gas models) and 18-inches or more (for steam models) is
suggested for ease of installation and service.
NOTE: 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,
1 or 2-inches is suggested between dryers (or wall) for ease of installation and maintenance.
Allowances must be made for the opening and closing of the control and lint door.
13
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 airflow of 3,700 cfm (cubic feet per minute) must be
supplied to each gas dryer and 4,400 cfm for each steam dryer. As a general rule, an unrestricted air entrance
from the outdoors (atmosphere) of a minimum of four (4) square feet is required for each gas dryer and a
minimum of 4.75 square feet for each gas dryer and a minimum of 4.75 square feet for each steam dryer or
126 Kw electrically heated dryer.
To compensate for the use of registers or louvers used over the openings, this make-up air area 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 six (6) gas dryers, two (2) openings measuring 3 feet by 4 feet - 0.92 m
by 1.2 m - (24 square feet [2.23 square meters]) 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.
14
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 tumbler (basket) 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.
NOTE: When a dryer is exhausted separately, it is recommended that a back draft damper be installed.
NOTE: When dryers are exhausted into a multiple (common) exhaust line, each dryer must be supplied
with a back draft damper.
The exhaust 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.
When single dryer venting is used, the duct work from the dryer to the outside exhaust outlet should not
exceed twenty (20) feet. 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 critical so
long as the minimum cross section area is provided. It is suggested that the use of 90º turns in ducting be
avoided; use 30º and/or 45º angles instead. The radius of the elbows should preferably be 1-1/2 times the
diameter of the duct. Excluding basket/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 section area of the duct work must be increased in proportion to number of
elbows added.
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 ducts to be added should overlap the duct to which it is
connected. ALL duct work joints must be taped to prevent moisture and lint from escaping into the building.
Additionally, 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 at the dryer exhaust duct area must
not exceed 0.3 inches of water column.
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.
15
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 exhaust 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
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 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 is 18-inches for a round duct or 16" x 16" for a square duct. Duct
size must not be reduced anywhere downstream of the dryer.
IMPORTANT: Exhaust back pressure measured by a manometer at each tumbler (basket) exhaust
duct area should not exceed 0.3 inches of water column.
It is suggested that the duct work from each dryer not exceed twenty (20) feet with no more than two (2)
elbows (excluding dryer connections and outside exhaust outlets). If the duct work exceeds twenty (20) feet
or has numerous elbows, the cross-sectional area of duct work must be increased in proportion to the length
and number of elbows in it. In calculating duct size, the cross-sectional area of a square or rectangular duct
must be increased by twenty percent (20%) for each additional twenty (20) feet. The diameter of a round
exhaust duct should be increased ten percent (10%) for each additional fifteen (15) feet. Each 90° elbow
is equivalent to an additional forty (40) feet, and each 45° elbow is equivalent to an additional twenty (20)
feet.
17
IMPORTANT: For extended duct work runs, the cross section area of the duct can only be increased
to an extent. Maximum proportional duct work runs cannot exceed twenty (20) feet
more than the original limitations of twenty (20) feet with two (2) elbows. When the
duct work approaches the maximum limits as 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 exhaust 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
nearest obstruction.
IMPORTANT: DO NOT use screens, louvers, or caps on the outside of opening of exhaust duct
work.
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 45° in the direction of airflow and should be spaced at least 55-1/2 inches
apart. The main duct should be tapered, with the diameter increasing before each individual 18-inch
duct is added.
IMPORTANT: The MD-170 is not provided with a back draft damper. When exhausted into a
multiple (common) exhaust line, a back draft damper must be installed at each dryer
duct.
IMPORTANT: No more than three (3) dryers should be connected to one (1) main common duct.
18
The main duct may be any shape or cross-sectional area, so long as the minimum cross section area is
provided. The illustrations on page 20 show 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 ratio 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 to the last dryer to where it exhausts to the outdoors is unusually long (over
twenty [20] feet) or has numerous elbows (more than two [2]) in it. In calculating duct work size, the cross
section area of a square or rectangular duct must be increased twenty percent (20%) for each additional
twenty (20) feet. The diameter of a round exhaust must be increased ten percent (10%) for each additional
twenty (20) feet. Each 90° elbow is equivalent to an additional forty (40) feet, and each 45° elbow is
equivalent to an additional twenty (20) 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 twenty
(20) feet more than the original limitations of twenty (20) feet with two (2) elbows.
When the duct work approaches the maximum limits as noted in this manual, a
professional HVAC firm should be consulted for proper venting information.
IMPORTANT: Exhaust back pressure measured by a manometer at each dryer exhaust duct area
should not exceed 0.3 inches of water column.
The duct 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 the weather, a 90° elbow bent downward
should be installed where the exhaust exits the building. If the exhaust 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
nearest obstruction.
IMPORTANT: DO NOT use screens, louvers, or caps on the outside of opening of exhaust duct
work.
19
20
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.
21
2. Electrical Service Specifications
M DG-170 (Gas)
M DS-170 (Steam)
ELECTRICAL SERVICE SPECIFICATIONS (PER
IMPORTANT: 208 VAC
NOTE:
AND
DRYER)
230/240 VAC ARE NOT THE SAME. When ordering, specify exact voltage.
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.
SERVICE
VOLTAGE
208
230/240
380/400
416
460
WIRE
PHASE
SERVICE
3ø
3ø
3ø
3ø
3ø
3
3
3/4
3/4
3/4
APPROX.
AMP DRAW
60 Hz 50 Hz
27
26
--13
--15
14
--
FUSING
Dual Element
Time Delay
40
40
25
20
20
CIRCUIT
BREAKER
60
60
30
25
25
IMPORTANT: The dryer must be connected to the electric supply shown on the data label that is
affixed to the back of the dryer, at the upper right hand corner. In the case of
208 VAC or 230/240 VAC, the supply voltage must match the electric service
specifications of the data label exactly.
WARNING: 208 VAC and 230/240 Volts ARE NOT THE SAME. Any damage done to dryer
components due to improper voltage connections will automatically VOID THE
WARRANTY.
NOTE: The manufacturer reserves the right to make changes in specifications at any time, without
notice or obligation.
22
3. Electrical Connections
NOTE: A wiring diagram is included with each dryer and is affixed to the rear upper right guard/panel
of the dryer.
The only electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, and L3), GROUND,
and in the case of four (4) wire service, the neutral. These electrical connections are made at the terminal
block located in the electric service/relay box at the rear, upper left hand corner of the dryer. To gain access
into this service box, the service cover must be removed.
The "LINE POWER" and the "GROUND" connections to the dryer must be made through the knock out
hole at the top of the electric service/relay box. A strain relief must be used where the line power/ground
wires go into the electric service/relay box.
Providing local codes permit, power connections to the dryer can be made by the use of a flexible
underwriters laboratory listed cord/pigtail (wire size must conform to the rating of the dryer), or the
dryer can be hard wired directly to the service breaker. In ALL cases, a strain relief must be used where
the wire(s) enter the dryer electrical service/relay box.
NOTE: A CIRCUIT SERVING EACH DRYER MUST BE PROVIDED.
23
4. Grounding
Grounding (earth) connections must be provided and installed in accordance with state and local codes. In
the absence of the codes, grounding must conform to applicable requirements of the National Electrical
Code ANSI/NFPA NO.70 LATEST EDITION. The ground connection may be to a proven earth ground at
the location service panel.
NOTE: A grounding connection (terminal lug) is provided in the dryer's electrical service/relay box at
the rear, upper left hand corner of the dryer.
For added personal safety, when possible, it is suggested that a separate ground wire (sized per local codes)
be connected from the ground connection of the dryer to a grounded cold water pipe. DO NOT ground to
a gas or hot water pipe. The grounded cold water pipe must have metal to metal connections all the way
to 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. For proper
operation of the microprocessor (computer), an earth (zero) ground is required.
NOTE: Grounding via metallic electrical conduit (pipe) is not recommended.
24
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 which will VOID 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
Z223.1-LATEST 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 (610 meters), unless
elevation requirements of over 2,000 feet (610 meters) 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 (610
meters) are made by changing each burner orifice. If this conversion is necessary, contact the distributor
who sold the dryer or contact the manufacturer's factory.
25
2. Technical Gas Data
a. Gas Specifications
TYPE
OF
G AS
NATURAL
3.5 inches W.C.
8.7 mb
10.5 inches W.C.
26.1 mb
6.0 - 12.0 inches W.C.
14.92 - 29.9 mb
10.5 inches W.C.
26.1 mb
Manifold Pressure*
Inline Pressure
LIQUID PROPANE
Shaded areas are stated in metric equivalents
* Measured at outlet side of gas valve pressure tap when gas valve is on.
b. Gas Connections:
Inlet connection ---- 1-inch N.P.T.
Inlet supply size ----- 1-inch N.P.T. (minimum)
Btu/hr input (per dryer) ----- 550,000 (138,600 kcal/hr)
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-inches (14.92 millibars) and a maximum of 12-inches water
column (29.9 millibars) 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 (26.1 millibars). 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.
TYP E
ADC
MODEL
NUMBER
BTU
Per Hour
Rating
kcal/hr
Rating
MDG-170
550,000
138,600
Natural
Qty. D.M.S.*
4
#2
Shaded area is stated in metric equivalent
* D.M.S. (Drill Material Size) equivalents are as follows:
Natural Gas ............... #2 = .2210" (5.6134 mm)
Liquid Propane Gas .. #29 = .1360" (3.4544 mm)
26
OF
G AS
Liquid Propane
Part
Part
Qty. D.M.S.*
Number
Number
140839
4
#29
140820
L.P.
Conversion
Kit
Part Number
880978
3. Piping/Connections
ALL components/materials must conform to National Fuel 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 1-1/2-inch N.P.T. inlet pipe connection extending out the back area of the burner
box. The minimum pipe size connection (supply line) to the dryer is 1-1/2-inch N.P.T. For ease of 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
supply 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.
Consistent gas pressure is essential at ALL gas connections. It is recommended that a 1-inch (2.54 cm) 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
(29.9 mb) pressure.
IMPORTANT: A water column pressure of 3.5 inches (8.7 mb) for natural gas and 10.5 inches
(26.1 mb) for L.P. dryers is required at the gas valve pressure tap of each dryer for
proper and safe operation.
A 1/8-inch 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 and L.P. gases must be used.
IMPORTANT: Test ALL connections for leaks by brushing on a soapy water solution (liquid
detergent works well).
WARNING: NEVER TEST FOR GAS LEAKS WITH A FLAME!!!
ALL components/materials must conform to National Fuel Gas Code Specifications ANSI Z223.1LATEST EDITION.
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.
27
IMPORTANT: The dryer and its individual shut-off valve must be disconnected from the gas supply
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 testing of the gas supply piping system at test pressures equal
to or less than 1/2 psig (3.5 kPa).
28
H. STEAM INFORMATION
It is your responsibility to have ALL steam plumbing connections made by a qualified professional to assure that
the 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 MDS-170 is manufactured with a pneumatic (piston) damper system which requires an
external supply of clean, dry, regulated air (80 PSI ±10 PSI [552 kPa ± 0.69 kPa]). Refer to
Steam Damper Air System Connections, Section H, item 3.
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.
2. Steam Requirements - High Pressure
Inlet ----- 1-1/2" (3.81 cm) supply line connection -- qty. one (1) at top manifold.
Return -- 1-1/2" (3.81 cm) return line connection --- qty. one (1) at bottom manifold.
OPERATING STEAM P RESSURE
MAXIMUM
125 psig
862 kPa
MINIMUM
100 psig*
689 kPa
HEAT INPUT (Normal Load)
CONSUMPTION (Approximate) @ 125
19 Bhp
PSI
725 lbs/hr
329.1 kg/hr
Shaded areas are stated in metric equivalents
* Minimum operating pressure for optimium results.
3. Installation Instructions
To insure that an adequate supply of steam is provided, be sure that the steam supply and steam return lines
are sized and laid out as stipulated in this manual. Inadequate steam supply and steam return lines or
improper steam plumbing will result in poor performance and can cause component failure. Clean, dry,
regulated steam must be provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam will VOID THE WARRANTY.
29
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
within a minimum 12-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, return, and drip trap return lines. This will
allow the dryer to be isolated from the supply and return mains if the dryer needs maintenance work.
e. Install an inverted bucket steam trap and check valve for each unit at least 12-inches below steam coil as
close to the coil as possible.
1) An inverted bucket steam trap with capacity of 1,400 pounds of condensate per hour @ 125 PSI is
required for each dryer.
f. A 3/4" vacuum breaker should be installed. This will save energy and provide for safety of the operator
and maintenance personnel.
g. The supply and return lines should be insulated. This will save energy and provide for safety of the
operator and maintenance personnel.
h. Water pockets in the supply line, caused by low points, will provide wet steam to the coil possibly causing
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 any condensate in the line to drain to the
header. Install a bypass trap in any low point to eliminate wet steam.
STEAM DAMPER SYSTEM
30
4. Steam Damper Connections
The MDS-170 steam dryer 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 of the top console.
a. Air Requirements
C OMPRESSED A IR SUPPLY
A IR PRESSURE
Normal
80 PSI
552 kPa
Minimum Supply
70 PSI
483 kPa
Maximum Supply
90 PSI
621 kPa
Shaded areas are stated in metric equivalents
b. Air Connection
Air connection to system -- 1/8-inch F.P.T.
c. No air regulation or filtration is provided with the dryer. External regulation/filtration of 80 PSI (552 kPa)
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.
5. Steam Damper System Operation
The MDS-170 steam damper, as shown in the top illustration on page 32, 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 (basket), allowing a rapid cool down.
Diagram 1 -- shows the damper in the heating (open) mode, allowing heat into the tumbler (basket).
Diagram 2 -- shows the damper in the cool down (closed) mode, pulling ambient air directly into the tumbler
(basket) without passing through the coils.
NOTE: With the dryer off or with no air supply, the damper is in the cool down mode as shown in
Diagram 2.
31
6. Steam Damper Piston (Flow Control) Operation Adjustment
Although the 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 the illustration above for correct steam
damper operation. If damper air adjustment is necessary, locate flow control valve and make necessary
adjustments as noted below.
32
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
left inside front side panel (refer to the illustration in Section IX of this manual). In 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 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.
5. Check to be sure drive belts between idler pulley and motor pulley have been reconnected.
NOTE: The drive belts were disconnected at factory prior to shipment.
6. GAS MODELS - be sure that ALL gas shut-off valves are in the open position.
7. Be sure ALL back panels (guards) and electric box covers have been replaced.
8. Check ALL service doors to assure that they are closed and secured in place.
9. Be sure lint drawer is securely in place.
NOTE: LINT DRAWER MUST BE ALL THE WAY IN PLACE TO ACTIVATE SAFETY
SWITCH OTHERWISE THE DRYER WILL NOT START.
10. Rotate the basket (tumbler) by hand to be sure it moves freely.
11. Check bolts, nuts, screws, terminals, and fittings for security.
12. GAS MODELS and STEAM MODELS - check to insure air supply to the dryer (80 PSI [552 kPa]) is on.
13. STEAM MODELS - check to insure ALL steam shut-off valves are open.
14. STEAM MODELS - check steam damper operation.
15. Check tumbler bearing set screws to insure they are ALL tight.
33
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.
2. Make sure the main door is closed and the lint drawer is securely in place.
3. System controls operational test -- to start the dryer ...
a. Microprocessor (computer) controls ...
1) L.E.D. (light emitting diode) display will read "FILL."
2) Press the "E" (preprogrammed) cycle key on the touchpad of the keyboard.
3) L.E.D. display will quickly read..."Ld30," "Lc04," and "F180" (unless special programs requested).
These codes mean that the dryer is in the timed mode and will operate with heat of 180º F (82º C) for
30 minutes drying time and have a 4 minute cool down period.
4) Dryer will now start and the L.E.D. display will read "Dr30" (dry mode for 30 minutes) and count
down in minutes.
NOTE: The dryer can be stopped at any time by opening main door or by pressing the
"CLEAR/STOP" key. To restart the dryer, press the "ENTER/START" key or
preprogrammed cycle key (i.e., "E").
NOTE: Pressing touchpad (keypad) key "A," "B," "C," "D," and "F" will also start the dryer. The six
(6) preprogrammed drying cycles ("A" through "F") have been stored in the microprocessor
(computer's) memory. Refer to the computer programming manual supplied with dryer for
these preprogrammed cycles.
b. Timer (manual) controls system operational test -- to start the dryer ...
1) Turn "HEAT" timer knob (clockwise [CW]) for a time desired (i.e., 1 minute to 60 minutes).
2) Make the desired temperature selection (i.e, "HIGH," "LOW," or "PERM PRESS") at the rocker
switch.
3) Press "PUSH TO START" switch button and the dryer will start.
4) To stop the dryer, open the main door.
34
4. Check to insure that the tumbler (basket) starts in the clockwise (CW) direction. Additionally, check the
direction of the blower motor impellor/fan (squirrel cage) to insure that it is operating in the correct direction
(blower motor pulley should be turning in the counterclockwise [CCW] direction). If it is, the phasing is
correct. If the phasing is incorrect, reverse two (2) leads at L1, L2, or L3 of the power supply connection
made to the dryer.
IMPORTANT: Dryer blower motor/pulley that drives the impellor/fan (squirrel cage) when viewed
from the back of the dryer must turn in the counterclockwise (CCW) direction,
otherwise the efficiency of the dryer will be drastically reduced and premature
component failure can result.
5. Heat Circuit Operational Test
a. Gas Models
1) When the dryer is first started (during initial start-up), the burner has a tendency not to ignite on the
first attempt. This is because the gas supply piping is filled with air, so it may take a few minutes for
this air to be purged from the lines.
NOTE: During the purging period, check to be sure that ALL gas shut-off valves are open.
2) The dryer is equipped with a Direct Spark Ignition (DSI) system which has internal diagnostics.
If ignition is not established, the heat circuit in the DSI module will "LOCK-OUT" until it is manually
reset. To reset the DSI system, open and close the main door then restart the dryer.
3) Once ignition is established, 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 (W.C.) pressure requirements (measured at the gas valve pressure tap);
Natural Gas -- 3.5 Inches W.C. (3.5 millibars)
L.P. Gas ------ 10.5 Inches W.C. (26.1 millibars)
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.
b. Steam Models
1) Check to insure that the steam damper is functioning properly.
6. Make a complete operational check of ALL safety-related circuits (i.e., lint drawer switch, and sail switch
on gas models).
NOTE: To check for proper sail switch operation, 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 heat (burner) does activate, shut dryer off and make necessary adjustments.
35
7. A reversing tumbler (basket) dryer should never be operated with less than a 60 lb. (27 kg) load (dry
weight). The size of the load will affect the coast-down and dwell (stop) times. The tumbler (basket) must
come to a complete stop before starting in opposite direction. For microprocessor controller (computer)
models, with the automatic (mode) cycle only, the Spin Time and Stop Time are not adjustable. The spin times
and stop times have been preprogrammed into the microprocessor controller (computer) for 120-seconds
spin time and a 5-second dwell (stop) time. (For timer controlled models, refer to the Reversing Timer
Spin/Dwell Adjustments in Section VIII of this manual.)
BASKET COATING
The tumbler (basket) is treated with a protective coating. We suggest dampening old garments or cloth
material with a solution of water and non-flammable mild detergent and tumbling them in the tumbler (basket)
to remove this coating.
8. Each dryer should be operated through one (1) complete cycle to assure that no further adjustments are
necessary and that ALL components are functioning properly.
9. Programs/selections (for microprocessor [computer] models Only):
a. Each 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.
K. 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 electrical 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.
36
L. COMPRESSED AIR REQUIREMENTS
The model MD-170 dryer requires an external supply of compressed air of 2.5 cfm at 80 PSI (552 kPa). For
Steam Models, compressed air is necessary for the air operated steam damper. On both the Steam Model as well
as the Gas Model, compressed air is necessary/required for blower air jet operation...to clean lint from the
impellor/fan (squirrel cage).
1. Air Requirements
C OMPRESSED A IR SUPPLY
A IR PRESSURE
Normal
80 PSI
552 kPa
Minimum Supply
70 PSI
483 kPa
Maximum Supply
90 PSI
621 kPa
Shaded areas are stated in metric equivalents
2. Air Regulation
a. No air regulation or filtration is provided with the dryer. External regulation/filtration of 80 PSI (552 kPa)
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.
3. Air Connection
a. Air connection to this system is a 1/8-inch F.P.T. (refer to the illustration below).
37
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 Maytag Company equipment was purchased. If the distributor
cannot be contacted or is unknown, contact the Maytag Customer Service Department for a distributor in
your area.
NOTE: When contacting the Maytag Company 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 Maytag Company equipment
was purchased. If the distributor cannot be contacted or is unknown, contact the Maytag Company for a
distributor in your area.
NOTE: When ordering replacement parts from the Maytag Customer dealer, be sure to give them the
correct model number and serial number so that your parts order can be processed in an
expeditious manner.
38
SECTION V
WARRANTY INFORMATION
A. RETURNING WARRANTY CARD(S)
1. Before any dryer leaves the manufacturer, a warranty card 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 should you file a warranty claim.
IMPORTANT: A separate warranty card must be completed and returned for each individual dryer.
NOTE: Be sure to include the installation date when returning the warranty card(s).
39
SECTION VI
ROUTINE MAINTENANCE
A. CLEANING
A program 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 airflow. If the guidelines in this section are met, a Maytag
Company 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.
Clean the lint drawer or screen every third or fourth load.
NOTE: Frequency can best be determined at each location.
SUGGESTED CLEANING SCHEDULE
DAILY (beginning of each work shift)
Clean lint from screen.
Inspect lint screen and replace if torn.
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.
STEAM DRYERS
Clean the steam coil fins. We suggest using compressed air and a vacuum cleaner with brush attachment.
WARNING: A 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 houses.
40
90 DAYS
Re-grease the two (2) 1-3/8-inch bearings that support the impellor/fan shaft. Use Shell Alvania #3 grease
or its equivalent. Impellor/fan shaft bearings should be lubricated.
Check to make sure that the set screws on the impellor/fan shaft bearings are tight.
Remove lint from around tumbler (basket), drive motors, and surrounding areas. Remove lint from gas valve
burner area with a dusting brush or vacuum cleaner attachment.
IMPORTANT: TO PREVENT DAMAGE, AVOID CLEANING OR TOUCHING IGNITOR
and FLAME-PROBE ASSEMBLY.
Remove lint accumulation from inside control box and at the rear area behind control box.
6 MONTHS
Inspect and remove lint accumulation in customer furnished exhaust duct work system and from dryers
internal exhaust ducting.
WARNING: THE ACCUMULATION OF LINT IN THE EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
WARNING: DO NOT OBSTRUCT THE FLOW OF COMBUSTION and VENTILATION AIR.
CHECK CUSTOMER FURNISHED BACK DRAFTED DAMPERS IN EXHAUST
DUCT WORK. INSPECT and REMOVE ANY LINT ACCUMULATION WHICH
CAN CAUSE DAMPER TO BIND OR STICK.
NOTE: A back draft damper that is sticking partially closed can result in slow drying and shutdown of
the heat circuit safety switches or thermostats.
NOTE: When cleaning dryer cabinets, avoid using harsh abrasives. A product intended for the cleaning
of appliances is recommended.
Check ALL V-belts for tightness and wear. Retighten, realign, or replace V-belt if required.
NOTE: V-belts should be replaced in matched sets (both belts).
41
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 switch, lint drawer switch,
sail switch, burner, and hi-limit thermostats).
C. LUBRICATION
The motor bearings, idler bearings...and under normal/most conditions the tumbler bearings are permanently
lubricated. It is physically possible to relubricate the tumbler bearings if you choose to do so even though this
practice is not necessary. Use Shell Alvania #3 or its equivalent. The tumbler bearings used in the dryer do not
have a grease fitting. Provisions are made in the bearing housing for the addition of a grease fitting which can be
obtained elsewhere, or from the manufacturer by ordering kit Part No. 882159, which includes two (2) fittings.
90 DAYS
Re-grease the two (2) 1-3/8-inch bearings that support the impellor/fan shaft. Use Shell Alvania #3 grease
or its equivalent. Impellor/fan shaft bearings should be lubricated.
Check to make sure that the set screws on the impellor/fan shaft bearings are tight.
Remove lint from around tumbler (basket), drive motors, and surrounding areas. Remove lint from gas
valve burner area with a dusting brush or vacuum cleaner attachment.
IMPORTANT: TO PREVENT DAMAGE, AVOID CLEANING OR TOUCHING IGNITOR
and FLAME-PROBE ASSEMBLY
Remove lint accumulation from inside control box and at the rear area behind control box.
42
SECTION VII
TROUBLESHOOTING
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.
The information provided will help isolate the most probable component(s) associated with the difficulty
described. The experienced technician realizes, however, that a loose connection or broken/ shorted wire may
be at fault where electrical components are concerned ... and not necessarily the suspected component itself.
Electrical parts should always be checked for failure before being returned to the factory.
The information provided should not be misconstrued as a handbook for use by an untrained person making
repairs.
IMPORTANT: When replacing blown fuses, the replacement must be of the exact rating as the fuse
being replaced.
WARNING: ALL SERVICE and TROUBLESHOOTING SHOULD BE PERFORMED BY A
QUALIFIED PROFESSIONAL or SERVICE AGENCY.
WARNING: WHILE MAKING REPAIRS, OBSERVE ALL SAFETY PRECAUTIONS
DISPLAYED ON THE DRYER or SPECIFIED IN THIS MANUAL.
MICROPROCESSOR (COMPUTER) MODELS
A. No L.E.D. (light emitting diode) display (for microprocessor [computer] models Only)...
1. Service panel fuse blown or tripped breaker.
2. Blown control circuit L1 or L2 1/2-amp (Slo Blo) fuse.
3. Failed microprocessor controller (computer).
4. Failed control step down transformer (for models 380 volts or higher Only).
B. Drive motor is not operating (does not start)...
1. Failed drive motor contactor (relay).
2. Failed arc suppressor (A.S.) board.
continued on page 44
43
continued from page 43
3. Failed drive motor.
4. Failed microprocessor controller (computer).
C. Drive motor (reversing) operates in one direction only...stops and restarts in same direction...
1. Failed drive motor contactor (relay).
2. Failed arc suppressor (A.S.) board.
3. Failed microprocessor controller (computer).
D. Drive motor operates okay for a few minutes, and then stops and will not restart...
1. Motor is overheating and tripping out on internal overload protector ...
a. Motor air vents clogged with lint.
b. Low voltage to the motor.
c. Failed motor.
d. Tumbler (basket), is binding ... check for obstruction.
e. Failed idler bearings or tumbler bearings.
E. Blower (impellor/fan) motor is not operating (does not start)...
1. Failed blower (impellor/fan) motor contactor (relay).
2. Failed arc suppressor (A.S.) board.
3. Failed blower (impellor/fan) motor.
4. Failed microprocessor controller (computer).
F. Blower motor operates okay for a few minutes, then stops and will not restart...
1. Motor is overheating and tripping out on internal overload protector ...
a. Motor air vents clogged with lint.
b. Low voltage to the motor.
c. Failed motor.
d. Failed blower (impellor/fan) drive shaft bearings.
NOTE: V-belts too tight or bearings not lubricated often enough.
44
G. Both drive motor and blower (impellor/fan) motor are not operating (do not start)...microprocessor
controller (computer) motor indicator dots and relay output L.E.D. indicator dots are on...
1. Failed arc suppressor (A.S.) board.
2. Failed contactors (both blower and drive).
3. Failed motors (both blower and drive).
H. Both drive motor and blower (impellor/fan) motor is not operating (do not start)... microprocessor
(computer) motor indicator dots and "door" L.E.D. indicator are on but relay output L.E.D.
indicators are off (L.E.D. [(light emitting diode] display does not read "door")...
1. Failed microprocessor controller (computer).
I. Both drive motor and blower motor run a few minutes and then stop...microprocessor controller
(computer) display continues to read time or percent of extraction and ALL indicator dots are
off...
1. Fault in main door switch circuit ...
a. Main door switch out of adjustment.
b. Loose connection in door switch circuit.
2. Fault in lint drawer switch circuit ...
a. Lint drawer switch out of proper adjustment.
b. Loose connection in the lint drawer switch circuit.
J. Microprocessor controller (computer) display reads "dSFL" continuously and the buzzer (tone)
sounds every 30-seconds......
1. Fault in microprocessor heat sensing circuit ...
a. Blown 1/8-amp ("dSFL") fuse on microprocessor controller (computer).
b. Failed microprocessor temperature sensor.
c. Failed microprocessor controller (computer).
d. Broken wire or connection somewhere between the microprocessor controller (computer) and the microprocessor temperature sensor.
45
K. Microprocessor controller (computer) display reads "door" and microprocessor controller
(computer) "door" L.E.D. indicator is off...
1. Fault (open circuit) in main door/lint drawer switch circuit ...
a. Lint drawer is not closed ALL the way.
b. Lint drawer switch out of proper adjustment.
c. Failed lint drawer switch.
d. Failed main door switch.
e. Broken connection/wire in main door or lint drawer circuit.
2. Failed 24 VAC step down transformer or fault in wiring.
L. Microprocessor controller (computer) L.E.D. (light emitting diode) display reads "door" and
microprocessor controller (computer) "door" L.E.D. indicator is on...
1. Failed microprocessor controller (computer).
M. Microprocessor controller (computer) will not accept any keyboard (touchpad) entries, i.e., L.E.D.
(light emitting diode) display reads "FILL" and when keyboard (touchpad) entries are selected,
the L.E.D. display continues to read "FILL"...
1. Failed keyboard (touchpad) label assembly.
2. Failed microprocessor controller (computer).
N. Microprocessor controller (computer) will only accept certain keyboard (touchpad) entries...
1. Failed keyboard (touchpad) label assembly.
O. Microprocessor controller (computer) locks up and L.E.D. (light emitting diode) display reads
erroneous message(s) or only partial segments...
1. Transient power voltage (spikes)...disconnect power to dryer, wait one (1) minute, and reestablish power to
dryer. If problem is still evident ...
a. Failed microprocessor controller (computer).
b. Failed keyboard (touchpad) label assembly.
P. Dryer stops during a cycle, microprocessor controller (computer) buzzer (tone) sounds for
5-seconds, L.E.D. (light emitting diode) display reads "dSFL," for approximately 30-seconds,
and then returns to "FILL"...
1. Loose connection somewhere between the microprocessor controller (computer) and the microprocessor
temperature sensor.
2. Loose "dSFL" 1/8-amp fuse on the microprocessor controller (computer).
46
Q. Dryer stops during a cycle, microprocessor controller (computer) buzzer (tone) sounds for
5-seconds, and then the L.E.D. (light emitting diode) display returns to FILL"...
1. Loose connection somewhere in the main power circuit to the microprocessor controller (computer).
2. Failed arc suppressor (A.S.) board.
R. Microprocessor controller (computer) L.E.D. (light emitting diode) display reads "SEFL"...
1. Rotational sensor circuit (option) failure...fault somewhere in tumbler (basket) rotation or circuit ...
a. Tumbler(basket) is not rotating ...
1) Broken or loose V-belts.
2) Failure in drive motor circuit...refer to Item B, Item C, and/or Item D on page 43 and page 44 in
this section.
b. Failed rotational sensor.
c. Broken wire or connection between sensor and microprocessor controller (computer).
2. Microprocessor controller (computer) program (PL02) is set incorrectly in the active mode ("SEn") where
the dryer is not equipped with the optional rotational sensor...program should be set as "nSEn."
S. Microprocessor controller (computer) L.E.D. (light emitting diode) display reads "Hot"...
1. Possible overheating condition...microprocessor controller (computer) has sensed a temperature which has
exceeded 220º F (105º C).
"Hot" display will not clear until temperature sensed has dropped to 220º F (105º C) or lower and the microprocessor controller (computer) is manually reset by pressing the "CLEAR/STOP" key.
T. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model, DSI module,
or Steam Model damper system pneumatic solenoid) when dryer is first started and both the heat
indicator dot and the "HEAT" output L.E.D. are on...
GAS MODELS
1. Fault in sail switch circuit ...
a. Sail switch out of adjustment and/or has failed.
b. Sail switch damper is not closing or is fluttering ...
1) Lint drawer/screen is dirty.
2) Restriction in exhaust.
3) No exhaust air flow.
continued on page 48
47
continued from page 47
a) Failed impellor (fan/blower) "squirrel cage."
b) Loose or failed impellor (fan/blower) assembly drive belts.
c) Fault in impellor (fan/blower) motor circuit...refer to Item E and Item F on page 44 in this
section.
2. Tripped burner manual reset hi-limit circuit.
3. Tripped lint chamber sensor bracket basket (tumbler) manual reset hi-limit switch.
STEAM MODELS
1. Tripped lint chamber sensor bracket basket (tumbler) manual reset hi-limit switch.
U. Heat unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model, DSI module, or
Steam Model damper system pneumatic solenoid) when dryer is first started and the microprocessor controller (computer) heat indicator dot is on but the "HEAT" relay output L.E.D. is
not on...
1. Failed microprocessor controller (computer).
V. No heat...voltage is confirmed at heating unit (i.e, Gas Model, DSI module, or Steam Model
damper system 3-way micro valve)...
GAS MODELS
1. Fault in Direct Spark Ignition (DSI) ignition system...
a. Ignitor sparks but there is no ignition and DSI module "LOCKS-OUT" ("red" L.E.D. [light emitting diode]
indicator light stays on) ...
1) Ignitor probe assembly is out of adjustment or has failed.
2) Severe air turbulence.
3) Failed Direct Spark Ignition (DSI) module.
4) Failed gas valve.
b. Ignitor sparks, burner lights but goes off right away ...
1) Ignitor probe assembly is out of adjustment or has failed.
2) Sail switch is fluttering ...
a) Lint drawer screen is dirty.
b) Restriction in exhaust duct work.
continued on page 49
48
continued from page 48
c. Ignitor does not spark and Direct Spark Ignition (DSI) module "LOCKS-OUT" ("red" L.E.D. [light
emitting diode] indicator light stays on) ...
1) Fault in high voltage (HV) wire...
a) Break in wire.
b) Loose connection.
c) Failed ignitor probe assembly.
d) Failed Direct Spark Ignition (DSI) module.
STEAM MODELS
1. No (external) compressed air (80 PSI [552 kPa] required) to steam damper solenoid.
2. Flow control valve is not adjusted correctly ...
a. Too much restriction.
3. Failed steam damper pneumatic (air) solenoid.
4. Damper stuck in "closed" position...
a. Check for obstruction.
5. Leak in the pneumatic (air) system.
6. Failed air piston.
W. Dryer operates but is taking too long to dry...
1. Exhaust duct work run too long or is undersized...back pressure cannot exceed 0.3 inches water column
(0.74 millibars).
2. Restriction in exhaust ...
a. Customer-furnished exhaust back draft damper is sticking partially closed.
b. Restriction in duct work ...
1) Check duct work from dryer ALL the way to the outdoors.
3. Insufficient make-up air.
4. Impellor (blower/fan) "squirrel cage" is rotating in the wrong direction.
5. Lint drawer screen is dirty or is not being cleaned often enough.
49
continued on page 50
continued from page 49
6. Inadequate air flow...
a. Impellor (blower/fan) "squirrel cage" failure.
b. Loose impellor (blower/fan) "squirrel cage" drive V-belts.
7. Gas Models
a. Low and/or inconsistent gas pressure;
Natural Gas pressure must be 3.5 inches of water column (8.7 millibars).
Liquid Propane (L.P.) pressure must be 10.5 inches of water column (26.1 millibars).
b. Poor air/gas mixture (too much gas or not enough air) at burner...yellow or poor flame pattern...
1) Not enough make-up air.
2) Restriction in exhaust.
3) Gas pressure too high.
4) Impellor (blower/fan) "squirrel cage" rotating in the wrong direction.
5) Burner orifice size (D.M.S.) too large for application (i.e., high elevation).
c. Sail switch is fluttering...
1) Restriction in exhaust...
a) Lint drawer screen is dirty or is not being cleaned often enough.
d.. Gas supply may have low heating value.
8. Steam Models
a. Low steam supply...
1) Steam trap too small.
2) Supply line too small.
b. Low steam pressure.
c. Insufficient make-up air.
d. Lint drawer screen is dirty or is not being cleaned often enough.
e. Restriction in the exhaust.
continued on page 51
50
continued from page 50
f. Dirty steam coil ...
1) Fins clogged with lint.
g. Steam damper system not functioning properly...
1) Damper is sticking closed.
2) Leak in pneumatic (air) system.
9. Extractors (washers) not performing properly.
10. Failed microprocessor (computer controlled models Only)...temperature calibration is inaccurate.
11. Failed microprocessor temperature sensor (computer controlled models Only) ...calibration is inaccurate.
12. Exceptionally cold/humid or low barometric pressure atmosphere.
13. Microprocessor temperature sensor (computer controlled models Only) is covered with lint.
NOTE: Lint accumulation on the sensor bracket can act as an insulator which will affect the accuracy of
the Automatic Drying Cycle.
X. Main burners are burning with a yellow flame (for Gas Models ONLY)...
1. Poor air/gas mixture (too much gas or not enough air) at burner ...
a. Not enough make-up air.
b. Restriction in exhaust.
c. Gas pressure too high.
d. Impellor (blower/fan) "squirrel cage" rotating in the wrong direction.
e. Burner orifice size (D.M.S.) too large for application (i.e., high elevation).
Y. Condensation on main door glass...
1. Too long, undersized, or improperly installed duct work.
2. Dryer connected to common exhaust duct with another dryer, and no back draft damper was installed in
customer-furnished duct work.
3. Customer-furnished back draft damper in duct work is sticking in partially closed position.
51
Z. Dryer or scraping noise at tumbler (basket) area...
1. Check for object caught in tumbler (basket)/wrapper area.
2. Tumbler (basket) is out of proper alignment ...
a. Check both vertical alignment and lateral alignment.
b. Check gap between front panel and tumbler (basket)...set screws may have come loose, and tumbler
(basket) walked forward or back.
3. Loose tumbler (basket) tie rod.
4. Failed tumbler (basket) support.
AA. Excessive noise and/or vibration...
1. Dryer is not leveled properly.
2. Impellor (fan/blower) "squirrel cage" out of balance ...
a. Excessive lint buildup impellor (fan/blower) "squirrel cage."
NOTE: Check to insure that the air jet is functioning.
b. Failed impellor (fan/blower) "squirrel cage."
3. Loose tumbler (basket) tie rod.
4. Failed tumbler (basket) support.
5. Loose motor mount.
6. Failed idler, tumbler (basket), or impellor (fan) bearings.
7. V-belt(s) either too tight or too loose.
8. Bearing set screws (tumbler basket], idler, or impellor [blower] shaft) are loose.
9. Failed motor bearings.
TIMER MODELS
A. Dryer will not start...both drive and blower motors are not operating (indicator light is off)...
1. Service panel fuse blown or tripped breaker.
2. Dryer control circuit L1 or L2 1/2-amp fuse is blown.
3. Open main door/lint drawer switch circuit ...
a. Lint drawer switch is not closed ALL the way.
continued on page 53
52
continued from page 52
c. Failed lint drawer switch.
d. Failed main door switch.
e. Broken connection/wire in main door or lint drawer switch circuit.
4. Failed push to start relay.
5. Failed 24 VAC step down transformer (for models 380 volts or higher Only).
B. Drive motor is not operating (does not start)...
1. Failed drive motor contactor (relay).
2. Failed drive motor.
C. Drive motor (reversing) operates in one direction only...stops and restarts in same direction...
1. Failed reversing contactor (relay).
2. Failed reversing timer.
D. Drive motor operates okay for a few minutes, and then stops and will not restart...
1. Motor is overheating and tripping out on overload protector ...
a. Motor air vents clogged with lint.
b. Low voltage to the motor.
c. Failed motor.
d. Tumbler (basket) is binding...check for obstruction.
e. Failed idler bearings or tumbler bearings.
E. Blower (impellor/fan) motor is not operating (does not start)...
1. Failed blower (impellor/fan) motor contactor (relay).
2. Failed blower (impellor/fan) motor.
F. Blower motor operates okay for a few minutes, and then stops and will not restart...
1. Motor is overheating and tripping out on overload protector ...
a. Motor air vent is clogged with lint.
b. Low voltage to motor.
continued on page 54
53
continued from page 53
c. Failed motor.
d. Failed blower (impellor/fan) drive shaft bearings.
NOTE: V-belts to tight or bearings not lubricated often enough.
G. Both drive motor and blower (impellor /fan) motor is not operating (do not start) and indicator
light is on...
1. Fault in L1 or L2 termination(s) between terminal block and contactors (relays).
2. Failed contactors (both blower and drive).
3. Failed motors (both blower and drive) .
H. Heating unit is not operating (no heat)...no voltage at heating unit (i.e., Gas Model, DSI module,
or Steam Model damper system pneumatic solenoid)...
GAS MODELS
1. Fault in sail switch circuit...
a. Sail switch is out of adjustment or has failed.
b. Sail switch damper is not closing or is fluttering...
1) Lint drawer screen is dirty.
2) Restriction in exhaust.
3) No exhaust air flow...
a) Failed impellor (fan/blower) "squirrel cage."
b) Loose or failed impellor (fan) assembly drive V-belts.
c) Fault in impellor (fan/blower) motor circuit...refer to Item E and Item F on page 44 in this
section.
2. Tripped burner manual reset hi-limit switch.
3. Tripped lint chamber sensor bracket tumbler (basket) manual reset hi-limit switch or circuit.
4. Failed temperature selection switch or circuit.
5. Failed temperature cycle thermostat (try another selection).
6. Failed heat timer.
54
STEAM MODELS
1. Tripped lint chamber sensor bracket tumbler (basket) manual reset hi-limit switch circuit.
2. Failed temperature selection switch or circuit.
3. Failed temperature cycle thermostat (try another selection).
4. Failed heat timer.
I. No heat...voltage is confirmed at heating unit (i.e., Gas Model, DSI module, or Steam Model
damper system pneumatic solenoid)...
GAS MODELS
1. Fault in Direct Spark Ignition (DSI) ignition system ...
a. Ignitor sparks but no ignition and Direct Spark Ignition (DSI) module "LOCKS-OUT" ("red" L.E.D.
indicator light stay on) ...
1) Ignitor probe assembly is out of adjustment or has failed.
2) Severe air turbulence.
3) Failed Direct Spark Ignition (DSI) module.
4) Failed gas valve.
b. Ignitor sparks, burner lights but goes off right away ...
1) Direct Spark Ignition (DSI) ignitor out of adjustment...or has failed.
2) Sail switch is fluttering ...
a) Lint drawer screen is dirty.
b) Restriction in exhaust duct work.
c. Ignitor does not spark and Direct Spark Ignition (DSI) module "LOCKS-OUT" ("red" L.E.D. indicator
light stays on) ...
1) Fault in high voltage (HV) wire...break or loose connection.
2) Failed ignitor probe assembly.
3) Failed Direct Spark Ignition (DSI) module.
55
STEAM MODELS
1. No (external) compressed air (80 PSI [552 kPa) required) to steam damper solenoid.
2. Flow control valve is not adjusted correctly ...
a. Too much restriction.
3. Failed steam damper pneumatic (air) solenoid.
4. Damper stuck in "closed" position ...
a. Check for obstruction.
5. Leak in the pneumatic (air) system.
6. Failed air piston.
J. Dryer operates but is taking too long to dry...
1. Exhaust duct work run too long or is undersized...back pressure cannot exceed 0.3 inches water column
(W.C.) - 0.74 millibars.
2. Restriction in exhaust ...
a. Customer-furnished exhaust back draft damper is sticking partially closed.
b. Restriction in duct work ...
1) Check duct work from dryer all the way to the outdoors.
3. Insufficient make-up air.
4. Impellor (blower/fan) "squirrel cage" is rotating in the wrong direction.
5. Lint drawer screen is dirty or is not being cleaned often enough.
6. Inadequate air flow...
a. Impellor (blower/fan) "squirrel cage" failure.
b. Loose impellor (blower/fan) "squirrel cage" drive V-belts.
7. Gas Models
a. Low and/or inconsistent gas pressure;
Natural Gas pressure must be 3.5 inches of water column (8.7 millibars).
Liquid Propane (L.P.) pressure must be 10.5 inches of water column (26.1 millibars).
continued on page 57
56
continued from page 56
b. Poor air/gas mixture (too much gas or not enough air) at burner...yellow or poor flame pattern ...
1) Not enough make-up air.
2) Restriction in exhaust.
3) Gas pressure too high.
4) Impellor (blower/fan) "squirrel cage" rotating in the wrong direction.
5) Burner orifice size (D.M.S.) too large for application (i.e., high elevation).
c. Sail switch is fluttering ...
1) Restriction in exhaust...
a) Lint drawer screen is dirty or is not being cleaned often enough.
d. Failed burner hi-limit switch...opens at incorrect temperature.
e. Gas supply may have low heating value.
8. Steam Models
a. Low steam supply ...
1) Steam trap too small.
2) Supply line too small.
b. Low steam pressure.
c. Insufficient make-up air.
d. Lint drawer screen is dirty or is not being cleaned often enough.
e. Restriction in exhaust.
f. Dirty steam coil ...
1) Fins clogged with lint.
g. Steam damper system not functioning properly ...
1) Damper is sticking closed.
2) Leak in pneumatic (air) system.
9. Extractors (washers) not performing properly.
continued on page 58
57
continued from page 58
10. Failed microprocessor controller (computer controlled models Only)...temperature calibration is
inaccurate.
11. Failed microprocessor temperature sensor (computer controlled models Only)...calibration is inaccurate.
12. Exceptionally cold/humid or low barometric pressure atmosphere.
13. Microprocessor temperature sensor (computer controlled models Only) is covered with lint.
NOTE: Lint accumulation on the sensor bracket can act as an insulator which will affect the accuracy of
the Automatic Drying Cycle.
K. Main burners are burning with a yellow flame (for Gas Models ONLY)...
1. Poor air/gas mixture (too much gas or not enough air) at burner...
a. Not enough make-up air.
b. Restriction in exhaust.
c. Gas pressure too high.
d. Impellor (blower/fan) "squirrel cage" rotating in the wrong direction.
e. Burner orifice size (D.M.S.) too large for application (i.e., high elevation).
L. Condensation on main door glass...
1. Too long, undersized, or improperly installed duct work.
2. Dryer connected to common exhaust duct with another dryer, and no back draft damper was installed in
customer-furnished duct work.
3. Customer-furnished back draft damper in duct work is sticking in partially closed position.
M. Dryer or scraping noise at tumbler (basket) area...
1. Check for object caught in tumbler (basket)/wrapper area.
2. Tumbler (basket) is out of proper alignment ...
a. Check both vertical alignment and lateral alignment.
b. Check gap between front panel and tumbler (basket) set screws may have come loose, and tumbler
(basket) walked forward or back.
3. Loose tumbler (basket) tie rod.
4. Failed tumbler (basket) support.
58
N. Excessive noise and/or vibration...
1. Dryer is not leveled properly.
2. Impellor (fan/blower) "squirrel cage" out of balance ...
a. Excessive lint buildup impellor (fan/blower) "squirrel cage."
NOTE: Check to insure that the air jet is functioning.
b. Failed impellor (fan/blower) "squirrel cage."
3. Loose tumbler (basket) tie rod.
4. Failed tumbler (basket) tie rod.
5. Looses motor mount.
6. Failed idler, tumbler (basket), or fan (impellor) bearings.
7. V-belt(s) either too tight or too loose.
8. Bearing set screws (tumbler [basket], idler, or impellor [blower] shaft) are loose.
9. Failed motor bearings.
10. Tumbler (basket) out of adjustment, or adjustment bolts (hardware) are loose.
59
SECTION VIII
REVERSING TIMER SPIN/DWELL ADJUSTMENTS
Timer models have an electric reversing timer in the electric service box which is located in the upper left 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
Time in Seconds*
30
60
90
120
150
Switch Position Number
1
2
3
4
5
Time in Seconds*
5
6
8
10
12
Dwell (Stop) Time
* Values shown are +/- 1 second.
60
SECTION IX
DATA LABEL LOCATION / INFORMATION
Data Label
When contacting Maytag Company, certain information is required to insure proper service/parts information
from Maytag. This information is on the data label that is located in the left inside front panel (as shown in the
illustration above). When contacting the Maytag Company please have the model number and the serial
number readily available.
61
THE DATA LABEL
1. MODEL DRYER
The model number is a manufacturer's number which describes the size of the dryer and the type of heat
(gas, electric, or steam).
2. SERIAL NUMBER
The serial number allows Maytag Company to gather information on your particular dryer.
3. MANUFACTURING CODE NUMBER
The manufacturing code number is a number issued by the manufacturer's which describes ALL possible
options on your particular model.
4. TYPE OF HEAT
The type of heat describes the type of 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. ELECTRIC SERVICE
This describes the electric service for your particular model.
7. GAS MANIFOLD PRESSURE (for GAS DRYERS)
This describes the manifold pressure taken at the gas valve tap.
62
SECTION X
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.
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.)
d. Verify that motor(s) heat, and door indicator lights on the back side of the microprocessor (computer
board are lit. (Refer to illustration below.)
63
e. Open main door. The dryer must stop and ALL output indicator lights on the back side of the microprocessor (computer) board must go out.
f. Try to restart the dryer with the main door open.
g.The microprocessor (computer) board's L.E.D. display must read "DOOR."
h.Close the main door and restart the dryer.
i. Functional check of microprocessor (computer) board is complete.
2. Direct Spark Ignition (DSI) System
Models manufactured with ADC module Part No. 880815
a. Upon completing installation of the replacement
Direct Spark Ignition (DSI) module, reestablish power
to the dryer.
b. Start the drying cycle.
c. The ignition (DSI) module's L.E.D. indicator will light
"red" for up to approximately 1.5 seconds (pre-purge
time).
d. The module's indicator light will then turn "green." The
gas valve will be energized and the ignitor probe will
spark for approximately 8 seconds. The burner flame
should now be established.
e. With the burner flame on, remove the flame sensor wire
from the FS terminal of the DSI module.
f. The burner flame must shut off and the ignition
module must lock out with the DSI module's indicator
light "red".
g. Stop the drying cycle, with the flame sensor wire still
removed, restart the drying cycle.
h. The ignition module must proceed through the
pre-purge, with the indicator light "red", the ignition
trial time of approximately 8 seconds, with the
indicator light "green", and then proceed to lock out
with the indicator light "red".
i. Functional check of the Direct Spark Ignition (DSI) Module is complete.
1)
Replace the flame sensor wire from the FS terminal to the DSI module.
64
2.
For models manufactured with Johnson Controls DSI (Direct Spark Ignition)
Module (G760)
Theory Of Operation;
Start the drying cycle. When the gas burner
ignites within the chosen trial for ignition
time (6-seconds), the flame sensor detects
gas burner flame and signals the Direct
Spark Ignition (DSI) module to keep the
gas valve open...as long as there is a call
for heat.
The DSI module will
“LOCKOUT” if the gas burner flame is
not sensed at the end of the trial for ignition
period. The trial for ignition period will be
repeated for a total of three (3) retries/trials
(the initial try and two [2] more retries/
trials). If the flame is not sensed at the
end of the third retry/trial (inter-purge period
of 30-seconds) the DSI module will
“LOCKOUT” (L.E.D. [light emitting
diode] flashes).
A steady L.E.D. (light emitting diode)
indicator indicates normal operation.
No L.E.D. (light emitting diode) indicator
indicates a power or an internal failure has
occurred.
65
SECTION XI
BURNER AND LINT (TUMBLER) CHAMBER
MANUAL RESET HI-LIMIT INSTRUCTIONS
IMPORTANT
MANUAL RESET HI-LIMIT INSTRUCTIONS
FOR DUAL TIMER OR PHASE 5 WITHOUT HEAT FAULT
(GAS MODELS ONLY)
This dryer was manufactured with a manual reset burner hi-limit and tumbler/lint chamber hi-limit
thermostat. If either manual reset burner hi-limit thermostat is open prior to the start of the drying cycle, or
during the cycle, the dryer will not recognize the open state of the burner hi-limit thermostat and will start or
continue through the drying cycle with no heat. Manual reset hi-limit thermostat must be reset manually.
This hi-temperature condition may be caused due to a restricted exhaust, poor airflow or improper burner
oven operation.
The location of the manual reset hi-limit switch is on the right side of the burner box.
IMPORTANT
This dryer is equipped with a burner
hi-limit and tumbler/lint chamber hi-limit
thermostat which must be reset manually.
WARNING: Discontinue power to dryer
before attempting to reset hi-limit.
ADC P/N:114093
66
IMPORTANT
MANUAL RESET HI-LIMIT INSTRUCTIONS
FOR DUAL TIMER OR PHASE 5 WITHOUT HEAT FAULT
(STEAM MODELS ONLY)
This dryer was manufactured with a manual reset tumbler/lint chamber hi-limit thermostat. If the manual
reset thermostat is open prior to the start of the drying cycle, or during the cycle, the dryer will not recognize
the open state of the hi-limit thermostat and will start or continue through the drying cycle with no heat. Manual
reset hi-limit must be reset manually.
This hi-temperature condition may be caused due to a restricted exhaust, poor airflow or improper heating
unit operation.
The location of the manual reset hi-limit is in the lint chamber area.
WARNING: discontinue power to dryer before attempting to reset hi-limit.
IMPORTANT
This dryer is equipped with a
lint chamber hi-limit thermostat
which must be reset manually
WARNING: Discontinue power to dryer
before attempting to reset hi-limit.
ADC P/N:114501
67
Part No. 113024
1- 02/16/00-25 2- 02/25/00-250