Maytag MDG-120PHV User manual

RETAIN THESE
INSTRUCTIONS IN A
SAFE PLACE FOR
FUTURE REFERENCE
MDG-120PHV / MDG-170PHV
Installation Manual
Phase 7 / Non-Coin / Dual Timer
with S.A.F.E. System
Part No. 113395-9
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.
—Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables à proximité de cet
appareil ou de tout autre appareil.
—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.
WARNING: For your safety the information
in this manual must be followed to
minimize the risk of fire or explosion and
to prevent property damage, personal
injury or death.
—Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
—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.

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.
“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.
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:
Whirlpool Corporation
Commercial Laundry
Benton Harbor, MI 49022
1-800-662-3587
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors and
liquids in the vicinity of this or
any other appliance.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser d’essence
ni d’autres vapeurs ou liquides
inflammables à proximité de cet
appareil ou de tout autre appareil.

IMPORTANT
YOU MUST DISCONNECTAND LOCKOUT THE ELECTRIC SUPPLYAND THE GAS
SUPPLY BEFORE ANY COVERS OR GUARDS ARE REMOVED FROM THE
MACHINETOALLOW ACCESS FOR CLEANING,ADJUSTING, INSTALLATION, OR
TESTING OF ANY EQUIPMENT PER OSHA (Occupational Safety and Health
Administration) STANDARDS.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYER(S).
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYERS IN OPERATION.
CAUTION
DRYERS SHOULD NEVER BE LEFT UNATTENDED WHILE IN OPERATION.
“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.»
State of California Proposition 65 Warnings:
WARNING: This product contains a chemical known to the State of California to cause
cancer.
WARNING: This product contains a chemical known to the State of California to cause
birth defects or other reproductive harm.
In the State of Massachusetts, the following installation instructions apply:
■Installations and repairs must be performed by a qualified or licensed contractor,
plumber, or gasfitter qualified or licensed by the State of Massachusetts.
■If using a ball valve, it shall be a T-handle type.
■A flexible gas connector, when used, must not exceed 3 feet.

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.
IMPORTANT
PLEASE OBSERVE ALLSAFETY PRECAUTIONS displayed on the equipment and/or
specified in the installation manual included with the dryer.
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER/SCREEN IN
PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
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).
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.

SECTION I
SAFETY PRECAUTIONS ................................................................................................................................................... 4
SECTION II
SPECIFICATIONS .............................................................................................................................................................. 6
A. MDG-120 Specifications ........................................................................................................................................ 6
B. MDG-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 .............................................................................................................................................. 26
J. Shutdown Instructions ........................................................................................................................................ 28
K. Operating Instructions ........................................................................................................................................ 28
L. Compressed Air Requirements (MDG-170 Only) ................................................................................................. 29
SECTION IV
SERVICE / PARTS INFORMATION ................................................................................................................................ 30
A. Service ................................................................................................................................................................. 30
B. Parts ..................................................................................................................................................................... 30
SECTION V
WARRANTYINFORMATION .......................................................................................................................................... 31
A. Returning Warranty Cards ................................................................................................................................... 31
B. Warranty .............................................................................................................................................................. 31
SECTION VI
ROUTINE MAINTENANCE .............................................................................................................................................. 32
A. Cleaning ............................................................................................................................................................... 32
B. Adjustments ........................................................................................................................................................ 33
C. Lubrication .......................................................................................................................................................... 33
SECTION VII
MANUAL RESET BURNER HI-LIMIT INSTRUCTIONS ................................................................................................. 34
A. Phase 7 ................................................................................................................................................................. 34
B. Dual Timer ........................................................................................................................................................... 34
SECTION VIII
DATALABELINFORMATION ......................................................................................................................................... 35
SECTION IX
REVERSINGTIMER SPIN / DWELLADJUSTMENTS ................................................................................................... 36
SECTION X
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT COMPONENTS ....................................................... 37
SECTION XI
SENSORACTIVATED FIRE EXTINGUISHING (S.A.F.E.) SYSTEM ................................................................................ 39
Table of Contents

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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 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. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE
DRYER.
13. 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.
14. 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 HealthAdministration) 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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MAXIMUM CAPACITY (DRY WEIGHT) 120 lb 54.4 kg
TUMBLER DIAMETER 44-5/8” 113.3 cm
TUMBLER DEPTH 42-1/8” 170.0 cm
TUMBLER VOLUME 38.1 cu ft 1078.87 L
TUMBLER MOTOR 3/4 hp 0.560 kW
DOOR OPENING (DIAMETER) 31-3/8” 79.7 cm
EXHAUST CONNECTION (DIAMETER) 14” 35.6 cm
DRYERS PER 20’ / 40’ CONTAINER 3 / 7
DRYERS PER 48’ / 53’ TRUCK 9 / 10
WATER CONNECTION 3/4-11.5 NH
VOLTAGE AVAILABLE 208V 3ø 3w 60 Hz
APPROX. NET WEIGHT 1,349 lb 611.9 kg
APPROX. SHIPPING WEIGHT 1,489 lb 675.4 kg
HEAT INPUT 375,000 Btu/hr 94,500 kcal/hr
AIRFLOW 2,150 cfm 60.88 cmm
INLET PIPE CONNECTION 1” F.N.P.T.
SECTION II
SPECIFICATIONS
A. MDG-120 SPECIFICATIONS
GAS
Shaded areas are stated in metric equivalents 11/21/13
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.

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NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.
MDG-120 Specifications

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MAXIMUM CAPACITY (DRY WEIGHT) 170 lb 77.11 kg
TUMBLER DIAMETER 51-1/2” 130.81 cm
TUMBLER DEPTH 42-1/2” 107.95 cm
TUMBLER VOLUME 51.20 cu ft 1,449.82 L
TUMBLER / DRIVE MOTOR 1 hp 0.75 kW
BLOWER / FAN MOTOR 7-1/2 hp 5.59 kW
DOOR OPENING (DIAMETER) 31-3/8” 79.69 cm
DOOR SILL HEIGHT 33-3/8” 84.77 cm
WATER CONNECTION 3/4”-11.5 NH
DRYERS PER 20’/40’ CONTAINER 3 / 7
DRYERS PER 48’/53’ TRUCK 8 / 9
VOLTAGE AVAILABLE 240V 3ø 3w 60 Hz
APPROXIMATE NET WEIGHT 2,103 lb 953.90 kg
APPROXIMATE SHIPPING WEIGHT 2,269 lb 1,029.20 kg
AIRFLOW 3,700 cfm 104.77 cmm
HEAT INPUT 550,000 Btu/hr 138,598 kcal/hr
EXHAUST CONNECTION (DIAMETER) 18” 45.72 cm
COMPRESSED AIR CONNECTION 1/4” Quick Connection
COMPRESSED AIR VOLUME 4.25 cfh 0.12 cmh
INLET PIPE CONNECTION 1-1/2” F.N.P.T.
B. MDG-170 SPECIFICATIONS
GAS
Shaded areas are stated in metric equivalents 11/12/13
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.

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MDG-170 Specifications
NOTE: The manufacturer reserves the right to make changes in specifications at any time without
notice or obligation.

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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) 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-B149.1-
M91 (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
Inside the 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
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.
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

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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. 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 SUPPLYREQUIREMENTS
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 MDG-170,
and 375 square inches (2419 cm2) for each MDG-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 MDG-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.

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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. 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. 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)
C = 15 feet (38.1 meters)
D = MDG-120: 14-inches (35.56 cm)
MDG-170: 18-inches (45.72 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.

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Maytag Co.
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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 45° 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 MDG-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)
B = 20 feet (6.10 meters)
Multiple Dryer Venting with 14-inch (35.56 cm) Diameter
2,150 cfm (60.88 cmm) Exhaust Connections at Common Duct
NUMBER OF DRYERS 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 615 455 255
SQ CM 3967 2935 1645
MINIMUM ROUND
DUCT DIAMETER
IN 28 24 18
CM 71 61 46
MDG-170
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 455 380 255 115
SQ CM 2935 2452 1645 742
MINIMUM ROUND
DUCT DIAMETER
IN 24 22 18 14
CM 60 55 45 35
MDG-120
Multiple Dryer Venting with 18-inch (45.72 cm) Diameter
3,700 cfm (104.77 cmm) Exhaust Connections at Common Duct
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.