Maytag MD-170PTVW Installation manual

MDG-120PVV / MD-170PTVW
Installation Manual
Phase 7 / Non-Coin / Dual Timer
with S.A.F.E. System
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
vapors 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 à
proximité de cet appareil ou de tout autre
appareil.
— WHAT TO 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’appareils.
• Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment.
• 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.
RETAIN THESE INSTRUCTIONS IN A SAFE
PLACE FOR FUTURE REFERENCE
Part No. 113395-6
Retain This Manual In A Safe Place For Future Reference
This product embodies advanced concepts in engineering, design, and safety. If this product is properly maintained, it will
provide many years of safe, efficient, and trouble free operation.
ONLY qualified technicians should service this equipment.
OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with
the dryer.
The following “FOR YOUR SAFETY” caution must be posted near the dryer in a prominent location.
FOR YOUR SAFETY
POUR VOTRE SÉCURITÉ
Do not store or use gasoline or
other flammable vapors 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 à proximité de cet
appareil ou de tout autre appareil.
We have tried to make this manual as complete as possible and hope you will find it useful. The 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. The illustrations included in this manual may not depict your particular dryer exactly.
Important
For your convenience, log the following information:
DATE OF PURCHASE ____________________________________________________ MODEL NO. ______________________
DEALER’S NAME __________________________________________________________________________________________
Serial Number(s)
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
For replacement parts, contact the dealer from which the dryer was purchased or contact:
Maytag Co.
403 West Fourth Street North
Newton, Iowa 50208
(641) 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 SUPPLYAND 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: Au moment de l’entretien des
commandes, étiquetez tous les fils avant de les
débrancher. Des erreurs de câblage peuvent entraîner
un fonctionnement inadéquat et dangereux.»
CAUTION
DRYERS SHOULD NEVER BE LEFT UNATTENDED WHILE IN OPERATION.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYER(S).
CHILDREN SHOULD BE SUPERVISED IF NEAR 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 dryer door switch, lint drawer switch, or
the heat safety circuits ever be disabled.
WARNING
The dryer must never be operated with any of the back guards, outer tops, or service
panels removed. PERSONAL INJURY OR FIRE COULD RESULT.
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN
PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment and/or
specified in the installation manual included with the dryer.
Dryer 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.
IMPORTANT
Dryer must be installed in a location/environment, which the ambient temperature
remains between 40° F (4.44° C) and 130° F (54.44° C).
Table of Contents
SECTION I
SAFETY PRECAUTIONS ......................................................................................................................................... 4
SECTION II
SPECIFICATIONS ................................................................................................................................................... 6
A. MDG-120 Specifications .............................................................................................................................. 6
B. MD-170 Specifications ................................................................................................................................. 8
SECTION III
INSTALLATION PROCEDURES .......................................................................................................................... 10
A. Location Requirements ............................................................................................................................... 10
B. Unpacking/Setting Up ................................................................................................................................. 11
C. Dryer Enclosure Requirements ................................................................................................................... 14
D. Fresh Air Supply Requirements .................................................................................................................. 15
E. Exhaust Requirements ................................................................................................................................. 16
F. Electrical Information ................................................................................................................................. 19
G. Gas Information .......................................................................................................................................... 22
H. Preparation for Operation ........................................................................................................................... 26
I. Preoperational Test ...................................................................................................................................... 27
J. Shutdown Instructions ............................................................................................................................... 29
K. Operating Instructions ................................................................................................................................ 29
L. Compressed Air Requirements (MD-170 Only) ......................................................................................... 30
M. Steam Information (MD-170 Only) ............................................................................................................ 31
SECTION IV
SERVICE/PARTS INFORMATION ...................................................................................................................... 35
A. Service ......................................................................................................................................................... 35
B. Parts ............................................................................................................................................................ 35
SECTION V
WARRANTY INFORMATION ............................................................................................................................... 36
A. Returning Warranty Cards .......................................................................................................................... 36
B. Warranty ...................................................................................................................................................... 36
SECTION VI
ROUTINE MAINTENANCE ................................................................................................................................... 37
A. Cleaning ....................................................................................................................................................... 37
B. Adjustments ................................................................................................................................................ 39
C. Lubrication .................................................................................................................................................. 39
SECTION VII
MANUAL RESET BURNER HI-LIMIT INSTRUCTIONS ................................................................................... 40
A. Phase 7 ........................................................................................................................................................ 40
B. Dual Timer .................................................................................................................................................. 40
SECTION VIII
DATA LABEL INFORMATION ............................................................................................................................. 41
SECTION IX
REVERSING TIMER SPIN/DWELL ADJUSTMENTS ......................................................................................... 42
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS ........................................ 43
SECTION XI
SENSOR ACTIVATED FIRE EXTINGUISHING (S.A.F.E.) SYSTEM ............................................................... 45
SECTION I
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 Maytag produces a very versatile dryer, 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 basket (tumbler) may damage
plastics or rubber and may be a fire hazard.
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7. A program should be established for the inspection and cleaning of lint in the heating unit area, exhaust
ductwork, 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 ductwork 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, or in Canada, the Canadian Electrical
Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.
NOTE: Failure to electrically ground the dryer properly will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switch, lint drawer switch, or the heat safety
circuits ever be disabled.
WARNING: PERSONAL INJURY OR FIRE COULD RESULT SHOULD THE DRYER
DOOR SWITCH, LINT DRAWER SWITCH, OR THE HEAT SAFETY
CIRCUITS EVER BE DISABLED.
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 (8.62 bar) steam pressure. Excessive steam
pressure can damage the steam coil and/or harm personnel.
13. Replace leaking flexible steam hoses or other 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.
15. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less
than sixty-six percent (66%) of its rated capacity.
16. If the rear area of the dryer, or the water supply is located in an area where it will be exposed to cold/
freezing temperatures, provisions must be made to protect these water lines from freezing.
WARNING: YOU MUST DISCONNECT AND LOCKOUT THE ELECTRIC SUPPLY AND
THE GAS SUPPLY BEFORE ANY COVERS OR GUARDS ARE REMOVED
FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING,
ADJUSTING, INSTALLATION, OR TESTING OF ANY EQUIPMENT PER
OSHA (Occupational Safety and Health Administration) STANDARDS.
IMPORTANT: Dryer must be installed in a location/environment, which the ambient
temperature remains between 40° F (4.44° C) and 130° F (54.44° C).
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SECTION II
SPECIFICATIONS
A. MDG-120 SPECIFICATIONS
Gas
MAXIMUM CAPACITY (DRY WEIGHT)
BASKET (TUMBLER) DIAMETER
BASKET (TUMBLER) DEPTH
BASKET (TUMBLER) VOLUME
BASKET (TUMBLER) MOTOR
DOOR OPENING (DIAMETER)
EXHAUST CONNECTION (DIAMETER)
DRYERS PER 20’/40’ CONTAINER
DRYERS PER 48’/53’ TRUCK
WATER CONNECTION
VOLTAGE AVAILABLE
APPROX. NET WEIGHT
APPROX. SHIPPING WEIGHT
HEAT INPUT
AIRFLOW
INLET PIPE CONNECTION
54.4 kg
113.3 cm
170.0 cm
1078.87 L
0.560 kW
79.7 cm
35.6 cm
120 lb
44-5/8”
42-1/8”
38.1 cu ft
3/4 hp
31-3/8”
14”
3/7
9/10
3/4-11.5 NH
208-575v 3ø 3, 4w 50/60 Hz
611.9 kg
1,349 lb
675.4 kg
1,489 lb
94,500 kcal/hr
375,000 Btu/hr
60.88 cmm
2,150 cfm
1” F.N.P.T.
Shaded areas are stated in metric equivalents
4/27/04
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.
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MDG-120 Specifications
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.
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Maytag Co.
7
B. MD-170 SPECIFICATIONS
MAXIMUM CAPACITY (DRY WEIGHT)
TUMBLER DIAMETER
TUMBLER DEPTH
TUMBLER VOLUME
TUMBLER/DRIVE MOTOR
BLOWER/FAN MOTOR
DOOR OPENING (DIAMETER)
DOOR SILL HEIGHT
WATER CONNECTION
Steam
Electric
Gas
DRYERS PER 20’/40’ CONTAINER
DRYERS PER 48’/53’ TRUCK
VOLTAGE AVAILABLE
APPROXIMATE NET WEIGHT
APPROXIMATE SHIPPING WEIGHT
60 Hz
AIRFLOW
50 Hz
HEAT INPUT
EXHAUST CONNECTION (DIAMETER)
COMPRESSED AIR CONNECTION
COMPRESSED AIR VOLUME
INLET PIPE CONNECTION
VOLTAGE AVAILABLE
APPROXIMATE NET WEIGHT
APPROXIMATE SHIPPING WEIGHT
60 Hz
AIRFLOW
50 Hz
EXHAUST CONNECTION (DIAMETER)
COMPRESSED AIR CONNECTION
COMPRESSED AIR VOLUME
OVEN SIZE
kcal/hr
kW
Btu/hr
108,300
126
429,900
VOLTAGE AVAILABLE
APPROXIMATE NET WEIGHT
APPROXIMATE SHIPPING WEIGHT
60 Hz
AIRFLOW
50 Hz
STEAM CONSUMPTION
OPERATING STEAM PRESSURE
EXHAUST CONNECTION (DIAMETER)
COMPRESSED AIR CONNECTION
COMPRESSED AIR VOLUME
BOILER HORSEPOWER (NORMAL LOAD)
SUPPLY CONNECTION
RETURN CONNECTION
Shaded areas are stated in metric equivalents
77.11 kg
170 lb
130.81 cm
51-1/2”
107.95 cm
42-1/2”
1,449.82 L
51.20 cu ft
0.75 kW
1 hp
5.59 kW
7-1/2 hp
79.69 cm
31-3/8”
84.77 cm
33-3/8”
3/4”-11.5 NH (North Ameri ca)
3/4” B.S.P.T. (Outsi de North Ameri ca)
3 / 7
8 / 9
208-575V
3ø 3,4w
50/60 Hz
953.90 kg
2,103 lb
1,029.20 kg
2,269 lb
104.77 cmm
3,700 cfm
87.30 cmm
3,083 cfm
138,598 kcal/hr
550,000 Btu/hr
45.72 cm
18”
1/4” Quick C onnecti on
0.12 cmh
4.25 cfh
1-1/2” F.N.P.T.
1-1/2” B.S.P.T. (C E and Australi a Only)
416-460V
3ø 3,4w
50/60 Hz
953.90 kg
2,103 lb
1,029.20 kg
2,269 lb
104.77 cmm
3,700 cfm
87.30 cmm
3,083 cfm
45.72 cm
18”
1/4” Quick C onnecti on
0.12 cmh
4.25 cfh
208-575V
3ø 3,4w
50/60 Hz
1,024.67 kg
2,259 lb
1,099.96 kg
2,425 lb
124.59 cmm
4,400 cfm
103.80 cmm
3,666 cfm
328.85 kg/hr
725 lb/hr
8.62 bar
125 psi max
50.80 cm
20”
1/4” Quick C onnecti on
0.12 cmh
4.25 cfh
19 Bhp
1-1/2” F.N.P.T.
1-1/2” F.N.P.T.
5/26/06
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.
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MD-170 Specifications
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.
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Maytag Co.
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 Z223.1LATEST EDITION (National Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical
Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91
(Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General
Installation and Gas Plumbing) or Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION
(for Electrical Connections).
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, or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1M91 (Natural Gas) or CAN/CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION (for General Installation and
Gas Plumbing).
1. The dryer must be installed on a sound level floor capable of supporting its weight. Carpeting must be
removed from the floor area that the dryer is to rest on.
IMPORTANT: “The dryer must be installed on noncombustible floors only.”
2. The dryer must not be installed or stored in an area where it will be exposed to water and/or weather.
3. The dryer is for use in noncombustible locations.
4. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air Supply
Requirements in Section D).
5. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer
Enclosure Requirements in Section C).
6. Provisions must be made for adequate clearances for servicing and for operation as noted in this manual
(refer to Dryer Enclosure Requirements in Section C).
7. The dryer must be installed with a proper exhaust duct connection to the outside as noted in this manual
(refer to Exhaust Requirements Section E).
8. The 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.
9. The dryer must be installed with adequate clearance for air openings into the combustion chamber.
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CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors. Every 6
months, inspect the exhaust ducting and remove any lint buildup.
IMPORTANT: The dryer must be installed in a location/environment, which the ambient
temperature remains between 40° F (4.44° C) and 130° F (54.44° C).
B. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer.
IMPORTANT: The 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 remove
skid from 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 three (3) Phillips head screws securing lint door in place.
1. Leveling Dryer
To level dryer, place 4-inch (10.16 cm) square metal shims (refer to illustration above) or other suitable
material under the base pads. It is suggested that the dryer be tilted slightly to the rear.
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2. If more headroom is needed when moving dryer into position, the top console (module) may be removed.
To Remove Top Console (Module)
a. Disconnect the ground wire (A) at the rear upper left hand corner of dryer.
b. Remove the eight (8) sets of nuts and washers (B) holding the console (module) to base.
c. Open the control door/control panel and disconnect the white 15-pin plug connector (C) located in the
base of the control box.
d. Disconnect white plug connector located outside back side of the control box (provides power to heat
circuit).
e. Lift the console (module) off the dryer base.
IMPORTANT: The dryer must be transported and handled in an upright position at ALL times.
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3. Exhaust Transition Piece
WARNING
An exhaust duct transition piece is shipped inside of the dryer’s
tumbler and must be installed on the dryer ’s
exhaust duct, with the hardware provided, BEFORE
location venting is connected to the dryer.
THIS EXHAUST DUCT TRANSITION PIECE
MUST BE INSTALLED FIRST!
Failure to observe this installation requirement may result in
damage to the dryer, create a FIRE HAZARD and will VOID
the manufacturer’s warranty.
012999JEV-GS/cj
P/N: 114092
Inside the basket (tumbler) of this dryer is an exhaust
transition piece that must be installed on the outlet
of the exhaust before any further venting is connected:
a. Remove the exhaust transition piece from the
basket (tumbler) and place it on the exhaust outlet.
b. Using the screws provided, secure the exhaust
transition piece to the dryer.
NOTE: It is recommended that this joint be
taped as well as ALL other duct joints to
prevent moisture and lint from escaping
into the building.
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C. DRYER ENCLOSURE REQUIREMENTS
Bulkheads and partitions should be made of noncombustible material.
NOTE: Allowances must be made for opening the control door.
A. 40-inches (101.6 cm) for optimum opening of load door.
B. The maximum thickness of the bulkhead is 4-inches (10.16 cm).
C. For gas dryers a minimum overhead clearance of 12-inches (30.48 cm) is required, providing no sprinkler is
located above the dryer. For steam dryers or if a sprinkler is located above the dryer, 18-inches (45.72 cm)
is required.
D. Dryer should be positioned 24-inches (60.96 cm) away from the nearest obstruction and 36-inches (91.44
cm) is recommended for ease of installation, maintenance, and service.
E. 2-inch (5.08 cm) minimum is required for opening the control door.
F. Flooring should be level or below dryer cabinet for ease of removing panels during maintenance.
G. Dryers may be positioned sidewall to sidewall, however a 1/16” (1.5875 mm) minimum allowance must be
made for the opening and closing of the control door, along with the removal of panels during maintenance.
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D. FRESH AIR SUPPLY REQUIREMENTS
When the dryer is operating, it draws in room air, heats it, passes this air through the 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. The dryer must be
installed with provisions for adequate combustion and make-up air supply.
Air supply must be given careful consideration to ensure proper performance of each dryer. As a general rule,
an unrestricted air entrance from the outdoors of 550 square inches (3548 cm2) is required for each MD-170,
and 375 square inches (2419 cm2) for each MD-120. (Based on 1 inch2 [6.5 cm2] per 1,000 Btu [252 kcal].)
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.
To compensate for the use of registers or louvers used over the openings, this area must be increased by
approximately 33%. Make-up air openings should not be located in an area directly ear where the exhaust
vents exit the building.
Allowances must be made for remote or constricting passageways or where dryers are located at high altitudes
or predominantly low pressure areas.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
Example: For a bank of six MD-170 dryers, two (2) openings measuring 3 feet by 4 feet (0.92 meters by 1.2
meters), which equals 24 square feet (2.23 square meters) are acceptable.
IMPORTANT: Make-up air must be free of dry cleaning solvent fumes. Make-up air that is
contaminated by dry cleaning fumes will result in irreparable damage to motors and
other dryer components.
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E. EXHAUST REQUIREMENTS
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized ductwork will
create excessive back pressure, which results in slow drying, increased use of energy, and shutdown of the
burner by the airflow (sail) switch, burner hi-limits, or lint chamber hi-limit protector thermostat. The dryer must
be installed with a proper exhaust duct connection to the outside.
The dryer shall not be exhausted into any gas vent, chimney, wall, ceiling or concealed space of a building.
CAUTION: This dryer produces combustible lint and must be exhausted to the outdoors. Improperly
sized or installed exhaust ductwork can create a potential fire hazard.
The ductwork should be laid out in such a way that the ductwork travels as directly as possible to the outdoors
with as few turns as possible. There should be a minimum 6-inch (15.24 cm) clearance between the back
guard and the first bend in the ductwork for ease of servicing. Single or independent dryer venting is recommended.
It is suggested that the use of 90° turns be avoided; use 30° and/or 45° bends instead. The radius of the elbows
should preferably be 1-1/2 times the diameter of the duct. ALL ductwork should be smooth inside with no
projections from sheet metal screws or other obstructions, which will collect lint. When adding ducts, overlap
the duct being connected. ALL ductwork joints must be taped to prevent moisture and lint from escaping into
the building. Back draft dampers must be installed in ALL commonly ducted systems. Inspection doors
should be installed at strategic points in the exhaust ductwork for periodic inspection and cleaning of lint from
the ductwork.
IMPORTANT: It is recommended that exhaust or booster fans not be used in the exhaust ductwork
system.
IMPORTANT: Exhaust back pressure measured by a manometer/magnehelic in the exhaust duct
must be no less than 0 and must not exceed 0.3 in WC (0.74 mb).
NOTE: When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible
materials, the opening must be 2-inches (5.08 cm) larger than the duct (all the way around).
The duct must be centered within this opening.
NOTE: As per the National Fuel Gas Code, “Exhaust ducts for type 2 clothes dryers shall be
constructed of sheet metal or other noncombustible material. Such ducts shall be equivalent in
strength and corrosion resistance to ducts made of galvanized sheet steel not less than 26
gauge (0.0195-inches [0.50 mm]) thick.”
The ductwork for this appliance must be suitable for the appliance category in accordance with national installation
regulations of the country of destination.
Outside Ductwork Protection
To protect the outside end of the horizontal ductwork from the weather, a 90° elbow bent downward should be
installed where the exhaust exits the building. If the ductwork 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 (refer to the diagram).
IMPORTANT: DO NOT use screens, louvers, or caps on the outside opening of the exhaust
ductwork.
16
Maytag Co.
113395 - 6
1. Single Dryer Venting
IMPORTANT: For extended ductwork runs, the cross-sectional area of the ductwork can only be
increased to an extent. When the ductwork approaches the maximum limits as noted
in this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm
should be consulted for proper venting information.
2. Horizontal Venting
When horizontal dryer venting is used, the length of the ductwork from the dryer to the outside exhaust
outlet, must not exceed 20 feet (6.10 meters). The minimum diameter of this ductwork must be at least
14-inches (35.56 cm) for MDG-120, 18-inches (45.72 cm) for MDG-170, and 20-inches (50.8 cm) for
MDS-170. Including tumbler/dryer elbow connections or elbows used for outside protection from the
weather, no more than 1 elbow should be used in the exhaust duct run. If more than 1 elbow is used, the
cross-sectional area of the ductwork must be increased.
3. Vertical Venting
When vertical dryer venting is used, the length of the ductwork from the dryer to the outside exhaust outlet,
must not exceed 15 feet (38.1 meters). The minimum diameter of this ductwork must be at least
14-inches (35.56 cm) for MDG-120, 18-inches (45.72 cm) for MDG-170, and 20-inches (50.8 cm) for
MDS-170. Including tumbler/dryer elbow connections or elbows used for outside protection from the
weather, no more than 3 elbows should be used in the exhaust duct run. If more than 3 elbows are used,
the cross-sectional area of the ductwork must be increased.
A = 20 feet (6.10 meters)
B = MDG-120: 14-inches (35.56 cm)
MDG-170: 18-inches (45.72 cm)
MDS-170: 20-inches (50.8 cm)
C = 15 feet (38.1 meters)
D = MDG-120: 14-inches (35.56 cm)
MDG-170: 18-inches (45.72 cm)
MDS-170: 20-inches (50.8 cm)
NOTE 1 Opening from combustible materials must be 2-inches (5.08 cm) larger than the
duct (all the way around). The duct must be centered within this opening.
NOTE 2 Distance should be 2 times the diameter of the duct to the nearest obstruction.
113395 - 6
Maytag Co.
17
4. Multiple Dryer (Common) Venting
IMPORTANT: For extended ductwork runs, the cross-sectional area of the ductwork can only be
increased to an extent. When the ductwork approaches the maximum limits as noted
in this manual, a professional heating, ventilating, and air-conditioning (HVAC) firm
should be consulted for proper venting information.
If it is not feasible to provide separate exhaust ducts for each dryer, ducts from individual dryers may be
channeled into a “common main duct.” The individual ducts should enter the bottom or side of the main
duct at an angle not more than 45º in the direction of airflow. The main duct should be tapered, with the
diameter increasing before each individual duct is added.
IMPORTANT: No more than 4 dryers for the MDG-120 and only 3 for the MD-170 should be
connected to 1 main common duct.
The illustration below shows the minimum cross-sectional area for multiple dryer round or square venting.
These figures must be increased if the main duct run from the last dryer to where it exhausts to the
outdoors is longer than 12 feet (3.656 meters) or has more than 1 elbow in it.
A = MDG-120 14-inch (35.56 cm)
MDG-170 18-inch (45.72 cm)
MDS-170 20-inch (50.8 cm)
B = 20 feet (6.10 meters)
NOTE 1 Opening from combustible materials must be 2-inches (5.08 cm) larger than the
duct (all the way around). The duct must be centered within this opening.
NOTE 2 Distance should be 2 times the diameter of the duct to the nearest obstruction.
NUMBER OF DRYERS
SQ IN
SQ CM
IN
MINIMUM ROUND
DUCT DIAMETER
CM
MINIMUM CROSSSECTIONAL AREA
MDG-170
Multiple Dryer Venting with 18-inch (45.72 cm) Diameter
3,700 cfm (104.77 cmm) Exhaust Connections at Common Duct
18
NUMBER OF DRYERS
SQ IN
SQ CM
IN
MINIMUM ROUND
DUCT DIAMETER
CM
MINIMUM CROSSSECTIONAL AREA
3
615
3967
28
71
2
455
2935
24
61
1
255
1645
18
46
4
455
2935
24
60
3
380
2452
22
55
2
255
1645
18
45
1
115
742
14
35
Multiple Dryer Venting with 20-inch (50.8 cm) Diameter
4,400 cfm (124.59 cmm) Exhaust Connections at Common Duct
MDS-170
MDG-120
Multiple Dryer Venting with 14-inch (35.56 cm) Diameter
2,150 cfm (60.88 cmm) Exhaust Connections at Common Duct
Maytag Co.
NUMBER OF DRYERS
SQ IN
SQ CM
IN
MINIMUM ROUND
DUCT DIAMETER
CM
MINIMUM CROSSSECTIONAL AREA
3
707
4561
30
76
2
531
3426
26
66
1
315
2032
20
51
113395 - 6
F. ELECTRICAL INFORMATION
1. Electrical Requirements
ALL electrical connections must be made by a properly licensed and competent electrician. This
is to ensure that the electrical installation is adequate and conforms to local and state regulations or codes.
In the absence of such codes, ALL electrical connections, materials, and workmanship must conform to
the applicable requirements of the National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION or in
Canada, the Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or 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, it can create a fire hazard. The copper conductor
wire/cable must be of proper ampacity and insulation in accordance with electric codes for making ALL
service connections.
NOTE: The use of aluminum wire will VOID THE WARRANTY.
IMPORTANT: A separate protected circuit must be provided to each dryer.
NOTE: An individual ground circuit must be provided to each dryer, DO NOT daisy chain.
IMPORTANT: The dryer must be connected to the electric supply shown on the data label. In the
case of 208 VAC or 240 VAC, the supply voltage must match the electric service
specifications of the data label exactly.
IMPORTANT: The wire size must be properly sized to handle the related current.
WARNING: 208 VAC AND 240 VAC ARE NOT THE SAME. Any damage done to dryer
components due to improper voltage connections will automatically VOID THE
WARRANTY.
NOTE: Component failure due to improper voltage application will VOID THE WARRANTY.
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.
113395 - 6
Maytag Co.
19
2. Electrical Service Specifications
IMPORTANT: Figures shown are for reversing models.
MD-120 Gas
ELECTRICAL SERVICE SPECIFICATIONS (PER DRYER)
IMPORTANT: 208 VAC AND 230/240 VAC ARE NOT THE SAME. When ordering,
specify exact voltage.
NOTES:
A.
B.
C.
When fuses are used they must be dual element, time delay, current
limiting, class RK1 or RK5 ONLY. Calculate/determine correct fuse value,
by applying either local and/or National Electrical Codes to listed
appliance amp draw data.
Circuit breakers are thermal-magnetic (industrial) motor curve type ONLY.
For others, calculate/verify correct breaker size according to appliance
amp draw rating and type of breaker used.
Circuit breakers for 3-phase (3ø) dryers must be 3-pole type.
SERVICE
VOLTAGE
PHASE
WIRE
SERVICE
208
240
230
380
380 / 400
416
440
460 / 480
575
3ø
3ø
3ø
3ø
3ø
3ø
3ø
3ø
3ø
3
3
3
3
4*
4*
3
3
3
APPROX.
AMP DRAW
60 Hz
50 Hz
14.5
14.6
—
8.5
—
—
8.7
7.8
5.8
—
—
17.4
—
8.7
9.0
—
—
—
CIRCUIT
BREAKER
20
20
25
15
15
15
15
15
15
* 3-Wire is available.
4/20/07
MD-170 Gas and Steam
ELECTRICAL SERVICE SPECIFICATIONS (PER DRYER)
IMPORTANT: 208 VAC AND 230/240 VAC ARE NOT THE SAME. When ordering,
specify exact voltage.
NOTES:
A.
B.
C.
When fuses are used they must be dual element, time delay, current
limiting, class RK1 or RK5 ONLY. Calculate/determine correct fuse value,
by applying either local and/or National Electrical Codes to listed
appliance amp draw data.
Circuit breakers are thermal-magnetic (industrial) motor curve type ONLY.
For others, calculate/verify correct breaker size according to appliance
amp draw rating and type of breaker used.
Circuit breakers for 3-phase (3ø) dryers must be 3-pole type.
SERVICE
VOLTAGE
PHASE
WIRE
SERVICE
208
240
230
380
380 / 400
416
440
460 / 480
575
3ø
3ø
3ø
3ø
3ø
3ø
3ø
3ø
3ø
3
3
3
3
4*
4*
3
3
3
APPROX.
AMP DRAW
60 Hz
50 Hz
28.3
26.7
—
16.2
—
—
14.4
13.9
11.4
—
—
31.9
—
16.1
16.0
—
—
—
* 3-Wire is available.
20
CIRCUIT
BREAKER
50
45
50
25
25
25
20
20
20
4/20/07
Maytag Co.
113395 - 6
3. Grounding
A ground (earth) connection must be provided and installed in accordance with state and local codes. In
the absence of these codes, grounding must conform to applicable requirements of the National Electrical
Code ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the installation must conform to applicable
Canada Standards: Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION. The
ground connection may be to a proven earth ground at the location service panel.
For added personal safety, when possible, it is suggested that a separate ground wire (size per local codes)
be connected from the ground connection of the dryer to a grounded cold water pipe. DO NOT ground to
a gas pipe or hot water pipe. The grounded cold water pipe must have metal-to-metal connection ALL
the way to the electrical ground. If there are any nonmetallic interruptions, such as, a meter, pump, plastic,
rubber, or other insulating connectors, they must be jumped out with a wire (size per local codes) and
securely clamped to bare metal at both ends.
IMPORTANT: For personal safety and proper operation, the dryer must be grounded.
Provisions are made for ground connection in each dryer at the electrical service connection area.
4. Electrical Connections
A wiring diagram is located inside the control box for connection data.
If local codes permit, power to the dryer can be made by the use of a flexible U.L. listed power cord/pigtail
(wire size must conform to rating of dryer), or the dryer can be hard wired directly to the service breaker
panel. In both cases, a strain relief must be installed where the wiring enters the dryer.
3-Phase (3ø) Wiring Connections/Hookup
IMPORTANT: A separate protected circuit must be provided to each 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 4-wire service, the neutral. 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 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.
The electrical connections on ALL 3-phase (3ø) gas and steam dryers are made into the rear service box
located at the upper left area of the dryer. The electrical connections are made at the power distribution
block located in the service box. The ground connection is made to the copper lug, also provided in this box.
To gain access, the service box cover must be removed.
The neutral will only be used on 4-wire service. This is typical for 380-416V, 50 Hz.
113395 - 6
Maytag Co.
21
G. GAS INFORMATION
It is your responsibility to have ALL plumbing connections made by a qualified professional to ensure that the
gas plumbing installation is adequate and conforms to 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, or in Canada, the Canadian Installation Codes
CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or 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 shutoff 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 shutoff valve during any pressure test of the
gas supply system at test pressures equal to or less than 1/2 psig (3.5 kPa).
IMPORTANT: Failure to isolate or disconnect the dryer from supply as noted can cause irreparable
damage to the gas valve VOIDING THE WARRANTY.
WARNING: FIRE OR EXPLOSION COULD RESULT DUE TO FAILURE OF
ISOLATING OR DISCONNECTING THE GAS SUPPLY AS NOTED.
1. Gas Supply
The gas dryer installation must meet the American National Standard...National Fuel Gas Code ANSI
Z223.1-LATEST EDITION, or in Canada, the Canadian Installation Codes CAN/CGA-B149.1 M91 (Natural
Gas) or CAN/CGA-B149.2-M91 (L.P. Gas) or 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 data label. If this information
does not agree with the type of gas available, DO NOT operate the dryer. Contact the dealer who sold
the dryer or contact the Maytag Co.
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 (609.6 meters), unless
elevation requirements of over 2,000 feet (609.6 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
(609.6 meters) is made by changing each burner orifice. If this conversion is necessary, contact the dealer
who sold the dryer or contact the Maytag Co.
22
Maytag Co.
113395 - 6
2. Technical Gas Data
a. Gas Specifications
TYPE OF GAS
NATURAL
Manifold Pressure*
In-Line Pressure
LIQUID PROPANE
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
11.0 inches W.C.
27.4 mb
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” N.P.T.
Inlet supply size -------------- 1” Diameter Pipe (minimum)
1) Natural Gas
Regulation is controlled by the dryer’s gas valve’s internal regulator. Incoming supply pressure
must be consistent between a minimum of 6.0 inches (14.92 mb) and a maximum of 12.0 inches
(29.9 mb) water column (W.C.) 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 (26.1 mb) water column. There is no
regulator or regulation provided in an L.P. dryer. The water column pressure must be regulated at
the source (L.P. tank) or an external regulator must be added to each dryer.
TYPE OF GAS
Model
Btu/hr
Rating
kcal/hr
Rating
Qty.
D.M.S.*
Part No.
Qty.
D.M.S.*
Part No.
Liquid
Propane
Conversion Kit
Part Number
MDG-120
375,000
94,500
3
#4
140832
3
#30
140819
880886
MDG-170
550,000
138,598
4
#2
140839
4
#29
140820
880978
Natural
Liquid Propane
Shaded areas are stated in metric equivalents
* Drill Measurement Size (D.M.S.) equivalents are as follows:
Natural Gas .........................
Liquid Propane Gas .............
Natural Gas .........................
Liquid Propane Gas .............
113395 - 6
#4
#30
#2
#29
=
=
=
=
0.2090” (5.3086 mm).
0.1285” (3.2639 mm).
0.2210” (5.6134 mm).
0.1360” (3.4544 mm).
Maytag Co.
23
3. Piping/Connections
ALL components/materials must conform to National Fuel Gas Code Specifications ANSI Z223.1-LATEST
EDITION, or in Canada, CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid
Propane [L.P.] Gas) or LATEST EDITION (for General Installation and Gas Plumbing), as well as local
codes and ordinances and must be done by a qualified professional. 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 being supplied.
The dryer is provided with a 1” 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” diameter. For ease of servicing, the gas
supply line of each dryer must have its own shutoff 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. 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 servicing 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 (29.9 mb) of
water column pressure (W.C.).
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” 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!!!
24
Maytag Co.
113395 - 6
IMPORTANT: The dryer and its individual shutoff valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess of
1/2 psig (3.5 kPa).
NOTE: The dryer must be isolated from the gas supply piping system by closing its individual manual
shutoff 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).
113395 - 6
Maytag Co.
25
H. PREPARATION FOR OPERATION
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. In case of
208 VAC or 230 VAC, the supply voltage must match the electric service exactly.
3. GAS MODELS – check to ensure 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 ensure that this important safety
control is functioning.
5. GAS MODELS – be sure that ALL gas shutoff valves are in the open position.
6. Be sure ALL back panels (guards) and electric box covers have been replaced.
7. Check ALL service doors to ensure that they are closed and secured in place.
8. 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.
9. Rotate the basket (tumbler) by hand to be sure it moves freely.
10. Check bolts, nuts, screws, terminals, and fittings for security.
11. GAS MODELS AND STEAM MODELS – check to ensure air supply (80 psi [5.51 bar]) is connected
to the dryer.
12. STEAM MODELS – check to ensure ALL steam shutoff valves are open.
13. STEAM MODELS – check steam damper operation.
14. Check basket (tumbler) bearing setscrews to ensure they are ALL tight.
26
Maytag Co.
113395 - 6
I. PREOPERATIONAL TEST
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. To start the dryer:
a. Microprocessor Controller (Computer) Dryers (refer to user’s manual included with dryer)
2. Check to ensure that the basket (tumbler) starts in the clockwise (CW) direction. Additionally, check the
direction of the blower motor (impellor/fan) to ensure that blower motor (impellor/fan) rotates in the clockwise
(CW) direction as viewed from the front. If it is, the phasing is correct. If the phasing is incorrect, reverse
two (2) of the leads at L1, L2, or L3 of the power supply connections made to the dryer.
IMPORTANT: Dryer blower motor (impellor/fan) as viewed from the front must turn in the clockwise
(CW) direction, otherwise dryer efficiency will be drastically reduced and premature
component failure can result.
3. 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.
2) The dryer is equipped with a Direct Spark Ignition (DSI) system, which has internal diagnostics. If
ignition is not established after the first attempt, the heat circuit DSI module will “LOCKOUT” until
it is manually reset. To reset the DSI system, open and close main door and restart dryer.
NOTE: During the purging period, check to be sure that ALL gas shutoff valves are open.
3) Once ignition is established, a gas pressure test should be taken at the gas valve pressure tap of
each dryer to ensure that the water column (W.C.) pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the gas valve pressure tap):
Natural Gas ---------------------- 3.5 inches (8.7 mb) water column.
Liquid Propane (L.P.) Gas ----- 10.5 inches (26.1 mb) water column.
IMPORTANT: There is no regulator provided in an L.P. dryer. The water column pressure must be
regulated at the source (L.P. tank) or an external regulator must be added to each
dryer.
b. Steam Models
Check to ensure that the steam damper is functioning properly.
113395 - 6
Maytag Co.
27
The steam damper should not “slam” (open or closed) when it reaches the end of (piston) travel.
Additionally, the steam damper should not bind and/or stop during travel. If either of these conditions
occur, the flow control must be adjusted. Refer to the bottom illustration on page 34 for air adjustment
instructions.
4. 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 the dryer off and make necessary adjustments.
5. Reversing basket (tumbler) dryers should never be operated with less than a 85 lb (38 kg) load (dry weight),
since the load’s weight affects basket (tumbler) coast time during a direction reversal command. It is
important that the basket (tumbler) come to a complete stop prior to starting in opposite direction.
a. Microprocessor Controller (Computer) Dryer Models
1) Spin and dwell (stop) times are not adjustable in the Automatic Mode and have been preprogrammed
into the microprocessor controller (computer) for a 120-second spin time and a 5-second dwell
(stop) time.
2) Spin and dwell (stop) times are adjustable in the Manual (Timed) Mode.
b. Dual Timer Dryer Models:
Spin and dwell (stop) times are adjustable at the reversing timer.
BASKET (TUMBLER) COATING
The basket (tumbler) is treated with a protective coating. It is suggested to dampen old garments or cloth
material with a solution of water and nonflammable mild detergent and tumble them in the basket (tumbler) to
remove this coating.
6. Each dryer should be operated through one complete cycle to ensure that no further adjustments are
necessary and that ALL components are functioning properly.
7. Make a complete operational check of ALL operating controls.
a. Microprocessor Controller (Computer) Programs and Selections:
Each microprocessor controller (computer) has been preprogrammed by the factory with the most
commonly used parameter (program) selections. If computer program changes are required, refer to
the computer programming manual, which was shipped with the dryer.
b. Dual Timer Dryer Models Check:
1) Heating Timer
2) Cool Down Timer
3) Temperature Selection Functions
28
Maytag Co.
113395 - 6
J. SHUTDOWN INSTRUCTIONS
If the dryer is to be shutdown (taken out of service) for a period of time, the following must be performed:
1. Discontinue power to the dryer either at the external disconnect switch or the circuit breaker.
2. Discontinue the gas or steam supply:
a. GAS MODELS – discontinue the gas supply.
1) SHUT OFF external gas supply shutoff valve.
2) SHUT OFF internal gas supply shutoff valve located in the gas valve burner area.
b. STEAM MODELS – discontinue the steam supply.
1) SHUT OFF external (location furnished) shutoff valve.
K. OPERATING INSTRUCTIONS
NOTE: Before attempting to start the dryer make sure that the main door is closed and the lint drawer
is securely in place.
1. To start the dryer:
a. Microprocessor Controller (Computer) Dryers (refer to user’s manual included with dryer).
b. Dual Timer Dryer Models:
1) Select drying time and cool down time desired.
a) Turn heat timer clockwise (CW) to desired time (i.e., 1 minute to 60 minutes).
b) Turn cool down timer clockwise (CW) to desired time (i.e., 0 minutes to 15 minutes).
2) Select drying temperature.
3) Push “Start” button.
Dryer will now start.
4) To stop dryer, open the main door.
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L. COMPRESSED AIR REQUIREMENTS (MD-170 Only)
The MD-170 model 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
Compressed
Air Supply
Air Pressure
Normal
Minimum Supply
Maximum Supply
80 psi
70 psi
90 psi
5.51 bar
4.82 bar
6.21 bar
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 ensure 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).
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M. STEAM INFORMATION (MD-170 Only)
It is your responsibility to have ALL steam plumbing connections made by a qualified professional to assure that
the installation is adequate and conforms to 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 dryer is manufactured with a pneumatic (piston) damper system, which requires an
external supply of clean, dry, regulated air (80 psi ± 10 psi [5.51 bar ± 0.68 bar]). Refer to
Steam Damper Air System Connections, Section M, item 4.
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” supply line connection -- qty. one (1) at top manifold.
Return --- 1-1/2” return line connection --- qty. one (1) at bottom manifold.
Operating Steam Pressure
M a xi m um
862 kPa
125 psi g*
He a t Inp ut ( No r m a l L o a d )
1 9 B hp
C o ns um p ti o n ( A p p r o xi m a te )
7 2 5 lb /hr
3 2 8 .8 5 k g /h r
Shaded areas are stated in metric equivalents
* The minimum operating pressure for optimum results is 100 psig (689.47 kPa).
3. Installation Instructions
To ensure an adequate supply of steam is provided, be sure that the steam supply lines and steam return
lines are sized and laid out as stipulated in this manual. Inadequate steam supply lines and steam return
lines or improper steam plumbing will result in poor performance and can cause component failure. Clean,
dry steam must be provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam will VOID THE WARRANTY.
a. The pressure of the condensate in the steam supply line will cause water hammer and subsequent heat
exchanger (steam coil) failure. The steam supply connection into the main supply line must be made
with a minimum 10-inch (25.4 cm) riser. This will prevent any condensate from draining towards the
dryer.
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b. The steam supply line to the dryer must include a 12-inch (30.48 cm) riser 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. Shutoff valves for each dryer should be installed in the supply line, return line, and drip trap return line.
This will allow the dryer to be isolated from the supply main and the return main if the dryer needs
maintenance work.
e. Install an inverted bucket steam trap and check valve at least 12-inches (30.48 cm) below the steam
coil as close to the coil as possible.
An inverted bucket steam trap with a capacity of 2,000 lb (907.18 kg) of condensate per hour @ 125 psi
(8.62 bar) is required for each dryer.
f. A 3/4-inch (19.05 mm) vacuum breaker should be installed. This will save energy and provide for the
safety of the operator and maintenance personnel.
g. Water pockets in the supply line, caused by low points, will provide wet steam to the coil possibly
causing steam coil damage. ALL horizontal runs of steam supply piping should be pitched 1/4-inch
(6.35 mm) for every one foot (0.30 meters) back towards the steam supply header causing the condensate
in the line to drain to the header. Install a bypass trap in any low point to eliminate wet steam.
STEAM DAMPER SYSTEM
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4. Steam Damper Air System Connections
The 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 inner top area of the dryer just in front of the electric service relay box. (Refer to the bottom
illustration on page 34.)
a. Air Requirements
Compressed
Air Supply
Air Pressure
Normal
Minimum Supply
Maximum Supply
80 psi
70 psi
90 psi
5.51 bar
4.82 bar
6.21 bar
Shaded areas are stated in metric equivalents
b. Air Connection
Air connection to system – 1/8” N.P.T.
c. No air regulator or filtration is provided with the dryer. External regulation/filtration of 80 psi (5.51 bar)
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 ensure that correct and clean air pressure
is achieved.
5. Steam Damper System Operation
The steam damper as shown in the top illustration on page 34, 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 basket (tumbler), allowing a rapid cool down.
Diagram 1 shows the damper in the heating (open) mode, allowing heat into the basket (tumbler).
Diagram 2 shows the damper in the cool down (closed) mode, pulling ambient air directly into the basket
(tumbler) without passing through the coils.
NOTE: With the dryer off or with no air supply, the steam damper is in cool down mode as shown in
Diagram 2 at the top of page 34.
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6. Steam Damper Air Piston (Flow Control) Operation Adjustment
Although the steam damper operation was tested and adjusted prior to shipping at 80 psi (5.51 bar), steam
damper operation must be checked before the dryer is put into operation. Refer to the illustration above
for correct steam damper operation. If steam damper adjustment is necessary, locate the flow control
valve and make the necessary adjustments as noted below.
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SECTION IV
SERVICE/PARTS INFORMATION
A. SERVICE
Service must be performed by a qualified trained technician, service agency, or gas supplier. If service is
required, contact the dealer from whom the Maytag equipment was purchased. If the dealer cannot be
contacted or is unknown, contact the Maytag Co. for a dealer in your area.
NOTE: When contacting the Maytag Co., be sure to give them the correct model number and
serial number so that your inquiry is handled in an expeditious manner.
B. PARTS
Replacement parts should be purchased from the dealer from whom the Maytag equipment was purchased. If
the Maytag dealer cannot be contacted or is unknown, contact the Maytag Co. for a dealer in your area.
NOTE: When ordering replacement parts from the Maytag dealer or the Maytag Co. be sure to
give them the correct model number and serial number so that your parts order can be
processed in an expeditious manner.
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SECTION V
WARRANTY INFORMATION
A. RETURNING WARRANTY CARDS
Before any dryer leaves the manufacturer’s test area, 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).
B. WARRANTY
For a copy of the manufacturer’s commercial warranty covering your particular dryer(s), contact the Maytag
dealer from whom you purchased the equipment and request a dryer warranty form. If the dealer cannot be
contacted or is unknown, warranty information can be obtained from the Maytag Co.
NOTE: Whenever contacting the Maytag Co. for warranty information, be sure to have the dryer’s
model number and serial number available so that your inquiry can be handled in an
expeditious manner.
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SECTION VI
ROUTINE MAINTENANCE
A. CLEANING
A program and/or schedule should be established for periodic inspection, cleaning, and removal of lint from
various areas of the dryer, as well as throughout the ductwork 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
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.
IMPORTANT: Dryer produces combustible lint and must be exhausted to the outdoors. Every 6
months, inspect the exhaust ducting and remove any lint buildup.
CLEAN THE LINT DRAWER/SCREEN EVERY THIRD OR FOURTH LOAD.
NOTE: Frequency can best be determined at each location.
SUGGESTED CLEANING SCHEDULE
DAILY (beginning of each work shift)
1. Clean lint from screen.
2. 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.
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STEAM DRYERS
Clean the steam coil fins. Suggest using compressed air and a vacuum cleaner with brush attachment.
NOTE: When cleaning steam coil fins, be careful not to bend the fins. If fins are bent, straighten by
using a fin comb, which is available from any local air-conditioning supply house.
90 DAYS
Remove lint from around basket (tumbler), drive motors, and surrounding areas. Remove lint from gas valve
burner area with a dusting brush or vacuum cleaner attachment.
NOTE: To prevent damage, avoid cleaning and/or touching ignitor/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 ductwork system and from dryer’s internal
exhaust ducting.
Blower motor (impellor/fan) belts and drive belts should be examined. Cracked and/or seriously frayed belts
should be replaced. Tighten belts when necessary.
WARNING: THE ACCUMULATION OF LINT IN THE EXHAUST DUCTWORK 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 DUCTWORK. 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 cabinet(s), avoid using harsh abrasives. A product intended for the
cleaning of appliances is recommended.
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B. ADJUSTMENTS
7 DAYS AFTER INSTALLATION AND EVERY 6 MONTHS THEREAFTER
Inspect bolts, nuts, screws, setscrews, grounding connections, and nonpermanent gas connections (unions, shutoff
valves, and orifices). 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).
NOTE: Squirrel cage type fan (impellor) on the blower motor must be inspected and cleaned every 6
months.
C. LUBRICATION
The motor bearings and under normal/most conditions the basket (tumbler) and idler bearings are permanently
lubricated. It is physically possible to relubricate the basket (tumbler) and idler bearings if you choose to do so
even though this practice is not necessary. Use Shell Alvania #2 or its equivalent. The basket (tumbler) and idler
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 Maytag dealer by ordering kit part
number 882159 (basket [tumbler] ONLY), which includes two (2) fittings.
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SECTION VII
MANUAL RESET BURNER HI-LIMIT INSTRUCTIONS
A. PHASE 7
This dryer was manufactured with a manual reset burner hi-limit thermostat, which is monitored by the Phase 7
computer. If the burner hi-limit is open prior to the start of the drying cycle, the dryer will start momentarily and
then shut down, the Phase 7 computer will display “burner HIGH LIMIT fault” with an audio indication.
If the burner hi-limit opens during a drying cycle, the Phase 7 computer will also display the same error code
described above, along with an audio indication. If the drum temperature is above 100° F (38° C), the dryer will
continue to run with no heat for 3 minutes or until the drum temperature has dropped below 100° F (38° C). The
clear/stop button on the Phase 7 keypad must be pressed to clear the error condition. The open burner hi-limit
must be reset “manually” prior to the start of the next cycle.
B. DUAL TIMER
This dryer was manufactured with a manual reset burner hi-limit thermostat. If the burner hi-limit 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 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 burner
operation.
The location of the burner hi-limit is on the right side of the burner box, looking at the burner from the back of the
dryer.
WARNING: Discontinue power to dryer before attempting to reset hi-limit.
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SECTION VIII
DATA LABEL INFORMATION
When contacting Maytag, certain information is required to ensure proper service/parts information from Maytag.
This information is on the data label affixed to the left side panel/wall area behind the control door. When
contacting Maytag, please have the model number and serial number available.
1. MODEL NUMBER – Describes the size of the dryer and the type of heat (gas, electric, or steam).
2. SERIAL NUMBER – Allows the manufacturer to gather information on your particular dryer.
3. MANUFACTURING CODE NUMBER – The number issued by the manufacturer, which describes ALL possible options
on your particular model.
4. TYPE OF HEAT – This describes the type of heat for your particular dryer, gas (either natural gas or liquid propane [L.P.]
gas), electric, or steam.
5. HEAT INPUT (for GAS DRYERS) – This describes the heat input in British thermal units per hour (Btu/hr).
6. ORIFICE SIZE (for GAS DRYERS) – Gives the number drill size used.
7. ELECTRIC SERVICE – This describes the electric service for your particular model.
8. GAS MANIFOLD PRESSURE (for GAS DRYERS) – This describes the manifold pressure taken at the gas valve tap.
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SECTION IX
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 (refer to the illustration below).
TIMING LEGEND
SPIN TIME
Adjustment Position Number
1
2
3
4
5
30
60
90
120
150
Adjustment Position Number
1
2
3
4
5
Time in Seconds*
5
6.3
7.6
8.9
10.2
Time in Seconds*
DWELL (STOP) TIME
* Values shown are +/- 1-second.
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SECTION X
PROCEDURE FOR FUNCTIONAL CHECK
OF REPLACEMENT COMPONENTS
1. Microprocessor Controller (Computer) Board
a. Phase 7 Non-Coin Models
1) Upon completing installation of the replacement
microprocessor controller (computer) board,
reestablish power to the dryer.
2) Start the drying cycle by pressing any of the preset
cycles in letters A-F.
3) Verify that the applicable indicator lights on the
microprocessor controller (computer) board are
lit. (Refer to the illustration below.)
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2. For Models with Direct Spark Ignition (DSI) Module (Type I)
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 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” (light emitting diode [L.E.D.] diagnostic
indicator flashes).
A steady L.E.D. indicator indicates normal operation.
No L.E.D. indicator indicates a power or an internal failure has occurred.
3. For Models with DSI Module (Type II)
Theory of Operation:
Start the drying cycle. When the gas burner ignites within the
chosen trial for ignition time (8-seconds), the flame sensor detects
gas burner flame and signals the 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” (a red L.E.D. diagnostic indicator will
flash).
An unlit red L.E.D. diagnostic indicator indicates normal operation.
A lit green L.E.D. diagnostic indicator indicates dryer controller is calling for heat and that ALL interlocks
have been satisfied.
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SECTION XI
SENSOR ACTIVATED FIRE EXTINGUISHING (S.A.F.E.) SYSTEM
(MICROPROCESSOR MODELS ONLY)
The exclusive fire suppression system will extinguish fires that may start in the drying basket (tumbler). A series
of sensors positioned throughout the basket (tumbler) and interfaced with the microprocessor controller (computer)
will trigger the fire suppression system water jet(s) to extinguish the flames quickly. The water jet(s) remain on
for 2 minutes and will automatically activate again if a fire condition remains or reignites. While the water jet(s)
are activated, the basket (tumbler) will jog to move the water throughout the load. Until the dryer is attended to,
the microprocessor controller (computer) will display that the system was activated.
BEFORE YOU START!
CHECK LOCAL CODES AND PERMITS
Call your local water company or the proper municipal authority for information regarding local codes.
IMPORTANT: It is your responsibility to have ALL plumbing connections made by a qualified
professional to assure that the plumbing installation is adequate and conforms to local,
state, and federal regulations or codes.
IMPORTANT: It is the installer’s or owner’s responsibility to see that the necessary or required
water, water pressure, pipe size, or connections are provided. The manufacturer
assumes no responsibility if the fire suppression system is not connected, installed, or
maintained properly.
INSTALLATION
1. Requirements
The fire suppression system must be supplied with a minimum water pipe size of 1/2” and be provided with
40 psi +/- 20 psi (2.75 bar +/- 1.37 bar) of pressure. For use of optional manual bypass, a second source
with the same piping and pressure requirements is required.
Flexible 1/2 feeds must be provided to avoid damage to electric water solenoid valve by vibration.
IMPORTANT: Flexible supply line/coupling must be used. Solenoid valve failure due to hard
plumbing connections WILL VOID WARRANTY.
If the rear area of the dryer or the water supply is located in an area where it will be exposed to
cold/freezing temperatures, provisions must be made to protect these water lines from freezing.
WARNING: If the water in the supply line or water solenoid valve freezes, the fire suppression system
will be INOPERATIVE!!
IMPORTANT: Appliance is to be connected to the water mains using a new hose set and the old
hose set should not be reused.
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2. Water Connections:
The water connection is made to the 3/4”-11.5
NH hose adapter of the electric water solenoid
valve, located at the rear upper midsection of the
dryer (refer to the photograph).
The water solenoid valve has a 3/8” M.P.T.
connection supplied with a 3/4”-11.5 NH hose
adapter to provide the minimum 1/2-inch supply
(feed) line. Flexible supply line/coupling must
be used in an effort to avoid damaging the electric
water solenoid valve.
NOTE: The 3/4”-11.5 NH is a standard hose coupling screw thread. It is not to be confused with
3/4” N.P.T. The sealing of an NH connection is made with a washer opposed to the mating
threads of an N.P.T. assembly. The two (2) thread designs are not compatible.
IMPORTANT: Flexible supply line/coupling must be used. Solenoid valve failure due to hard
plumbing connections WILL VOID WARRANTY. It is recommended that a filter
or strainer be installed in the water supply line.
Typical Water Supply
OPTIONAL MANUAL BYPASS
Provisions are made in the dryer’s fire suppression system for the installation of an optional manual bypass.
Depending on the model dryer, the connections for the manual bypass are made at the “T” or “three way” fitting
located in the outlet supply side of the water solenoid valve. The use and connections of this manual bypass are
at the option or discretion of the owner.
The water connection for the manual bypass is made to the “T” or “three way” fitting, which has a 3/8” F.P.T.
and a coupling must be used to provide the minimum 1/2” supply (feed) line.
If the rear area of the dryer or the water supply is located in an area where it will be exposed to cold/freezing
temperatures, provisions must be made to protect these water lines from freezing.
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WARNING: If the water in the supply line or water solenoid valve freezes, the fire suppression system
will be INOPERATIVE!!
The manual ball cock shutoff valve must be located outside of the dryer at a distance from the dryer where it
is easily accessible.
3. Electrical Requirements
No independent external power source or supply connection is necessary. The 24-volt power to operate
the fire suppression system is accomplished internally in the dryer (from the dryer controls).
WARNING: Electrical power must be provided to the dryer at ALL times. If the main electrical
power supply to the dryer is disconnected, the fire suppression system is
INOPERATIVE!!
FIRE SUPPRESSION SYSTEM THEORY OF OPERATION
While the dryer is in an idle state, or 20-seconds after the heat turns off, the microprocessor controller (computer)
monitors the thermistor probe, located in the top of the basket (tumbler) chamber, and records the minimum
temperature. If the minimum recorded thermistor probe temperature is greater than 120° F (48° C) and the
microprocessor controller (computer) detects a 50° rise in temperature, this will be the trip point and the fire
suppression system routine will activate.
While a drying cycle is in process and the heat has turned on at least once, the microprocessor controller
(computer) monitors the exhaust temperature transducer. If the drying cycle temperature set point is set greater
than 160° F (71° C) and the microprocessor controller (computer) detects an exhaust temperature rise 25° F
greater than set point, this will be the trip point and the fire suppression system routine will activate. If set point
is below 160° F (71° C), the trip point will be 185° F (85° C).
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Once the fire suppression system routine is activated, the microprocessor controller (computer) will display
“S.A.F.E. SYSTEM ACTIVATED” and water will be injected into the basket (tumbler) chamber. Any time
water is being injected into the basket (tumbler), the basket (tumbler) drive will turn the load for 1-second every
15-seconds. This process will continue for a minimum of 2 minutes. After the 2 minutes have elapsed, the
microprocessor controller (computer) will check if the temperature remained above trip point; if so, the water
will remain on. The microprocessor controller (computer) will continue to check if the temperature is above trip
point every 30-seconds. If the water has been on for a constant 10 minutes, the water will be turned off,
regardless of the temperature, and the microprocessor controller (computer) will display “S.A.F.E. SYSTEM
WAS ACTIVATED”. If the temperature has dropped below trip point, the microprocessor controller (computer)
will turn off the water prior to 10 minutes.
SYSTEM RESET
After the microprocessor controller (computer) determines that the situation is under control and shuts the water
being injected into the basket (tumbler) off, the microprocessor controller (computer) display will read, “S.A.F.E.
SYSTEM WAS ACTIVATED”, and the horn/tone will sound until reset manually.
To reset the microprocessor controller (computer) once the microprocessor controller (computer) displays,
“S.A.F.E. SYSTEM WAS ACTIVATED”, press the red “STOP/CLEAR” key on the keypad.
FIRE SUPPRESSION SYSTEM WATER VALVE CHECK
The operation of the water solenoid valve can be tested to ensure that the water supply system and valve are
functional. Before attempting a system check, be sure that ALL water supply shutoff valves to the dryer are in
the OPEN position, the dryer must be in the “READY” Mode with no cycle loaded or in progress.
1. Press and hold the red “STOP/CLEAR” key (while in “READY” Mode and no cycle is in progress).
2. Press and hold the “A” key.
3. Water valve will open and water will be dispensed into basket (tumbler) area as long as both keys are held.
The microprocessor controller (computer) will prompt the user to perform a fire suppression system valve check
at every 4000 hours to ensure proper functionality. At the 4000 hour mark, the microprocessor controller
(computer) will wait for end of the cycle and then will prompt the user to “PLEASE EMPTY TUMBLER,
THEN PRESS THE ‘STOP/CLEAR’ AND ‘A’ KEYS TO TEST THE WATER VALVE”. When the ‘STOP/
CLEAR’ and ‘A’ keys are pressed, the microprocessor controller (computer) will activate the fire suppression
system water valve for 2-seconds, at which point the microprocessor controller (computer) will prompt the user
with the following message, “IF WATER DID NOT TURN ON, CALL FOR SERVICE. THANK YOU.”
NOTE: The microprocessor controller (computer) will not let the user continue until the valve test has
been completed.
FIRE SUPPRESSION SYSTEM DIAGNOSTICS
In the event that the non-coin microprocessor controller (computer) detects a fault in the fire suppression
system, the non-coin microprocessor controller (computer) will display the message, “S.A.F.E. SYSTEM
DISABLED…READY”. To find out why the fire suppression system is disabling, press and hold the red
“STOP/CLEAR” and green “START” keys. This will cause the microprocessor controller (computer) to display
a diagnostic message, as detailed in the “Fire Suppression System Diagnostics Messages” section.
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FIRE SUPPRESSION SYSTEM DIAGNOSTICS MESSAGES
OPEN THERMISTOR PROBE – This message indicates that the fire suppression system thermistor probe
either is not connected or is damaged. If this condition is detected, the microprocessor controller (computer) will
immediately enter S.A.F.E. SYSTEM DISABLED Mode.
SHORTED THERMISTOR PROBE – This message indicates that the fire suppression system thermistor
probe is damaged or the wiring is shorted. If this condition is detected, the microprocessor controller (computer)
will immediately enter S.A.F.E. SYSTEM DISABLED Mode.
DISCONNECTED WATER VALVE – This message indicates that the water valve is open or that it is not
connected to the microprocessor controller (computer). If this condition is detected, the microprocessor controller
(computer) will continue to monitor the condition for a period of 5 minutes before entering S.A.F.E. SYSTEM
DISABLED Mode. Once the condition is corrected, the microprocessor controller (computer) will continue to
monitor the condition for 1 minute before exiting S.A.F.E. SYSTEM DISABLED Mode.
SHORTED WATER VALVE – This message indicates that the water valve is shorted or that the wiring to the
valve is shorted. If this condition is detected, the microprocessor controller (computer) will continue to monitor
the condition for a period of 5 minutes before entering S.A.F.E. SYSTEM DISABLED Mode. Once the
condition is corrected, the microprocessor controller (computer) will continue to monitor the condition for 1
minute before exiting S.A.F.E. SYSTEM DISABLED Mode.
WATER NOT CONNECTED – This indicates that there is no water pressure at the water valve. This will
occur if water is not connected to the dryer, or if there is low water pressure in the water line coming to the
dryer. This could also signify a defective pressure switch or defective wiring to the pressure switch. If this
condition is detected, the microprocessor controller (computer) will continue to monitor the condition for a period
of 5 minutes before entering S.A.F.E. SYSTEM DISABLED Mode. Once the condition is corrected, the
microprocessor controller (computer) will continue to monitor the condition for 1 minute before exiting S.A.F.E.
SYSTEM DISABLED Mode.
STARTING A CYCLE WHEN MICROPROCESSOR CONTROLLER
(COMPUTER) IS IN “S.A.F.E. SYSTEM IS DISABLED” MODE
When the fire suppression system is disabled, the user can still start a cycle. However, when a cycle is started,
the non-coin microprocessor controller (computer) will display the following message, “S.A.F.E. SYSTEM IS
DISABLED. PRESS ‘START’ TO CONTINUE”. This message will be displayed every time a cycle is
started, until the disabling condition has been corrected.
113395 - 6
Maytag Co.
49
Part No. 113395
6 - 05/01/07 - 0