American Dryer Corp. M31SL Administrator Guide

M31SL / M50SL / M75SL
Installation/Operator Manual
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.
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.
ADC Part No. 113431-10
American Dryer Corporation
88 Currant Road
Fall River MA 02720-4781 USA
Telephone: [phone] / Fax: [phone]
e-mail: [e-mail]
www.amdry.com

2 American Dryer Corp. 113431-10
“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.
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.
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. ________________________
RESELLER’S NAME ______________________________________________________________________________________
SERIAL NUMBER(S) ______________________________________________________________________________________
_______________________________________________________________________________________________________
_______________________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts
from the factory, you can FAX your order to ADC at [phone] or telephone your order directly to the
ADC Parts Department at [phone]. Please specify the dryer model number and serial number in
addition to the description and part number, so that your order is processed accurately and promptly.
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.

113431-10 www.amdry.com 3
Table of Contents ________
List of Acronyms _____________________________
HVAC Heating, Ventilating, and Air-Conditioning
in wc Inches of Water Column
L.C.D. Liquid Crystal Display
L.E.D. Light Emitting Diode
L.P. Liquid Propane
OSHA Occupational Safety and Health Administration
R.M.A. Return Material Authorization
UL Underwriters Laboratory
Safety Precautions ................................ 4
M31SL Specifications ........................... 6
M50SL Specifications ........................... 8
M75SL Specifications .........................10
Installation Procedures ......................12
Location Requirements ......................................... 12
Unpacking/Setting Up ........................................... 12
Dryer Enclosure Requirements ............................. 12
Fresh Air Supply Requirements ............................ 13
Exhaust Requirements ......................................... 13
Electrical Information ............................................ 15
Gas Information .................................................... 18
Converting from One Family of Gas to Another ..... 21
Gas Pressure Testing ........................................... 23
Steam Information ................................................. 23
Water Information ................................................. 24
Preparation for Operation/Start-Up ........................ 25
Preoperational Test ............................................... 25
Preoperational Instructions ................................... 26
Shutdown Instructions .......................................... 26
Service/Parts Information ..................27
Service .................................................................. 27
Parts ..................................................................... 27
Warranty Information .........................27
Returning Warranty Cards..................................... 27
Warranty ............................................................... 27
Returning Warranty Parts ..................................... 27
Routine Maintenance ..........................28
Cleaning ................................................................ 28
Data Label Information ....................... 29
IMPORTANT
You must disconnect and lockout the electric supply
and the gas supply or the steam supply before any
covers or guards are removed from the machine to
allow access for cleaning, adjusting, installation, or
testing of any equipment per OSHA standards.
Please observe all safety precautions displayed on
the equipment and/or specified in the installation
manual included with the dryer.
Before installation, check that the local distribution
conditions, nature of gas and pressure, and
adjustment of the appliances are compatible.
CAUTION
Dryer(s) should never be left unattended while in
operation.
When discarding or storing your old clothes
dryer, remove the door.
Lorsque vous entreposez ou mettez votre
sécheuse au rebut, enlevez-en la porte.
“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.»
WARNING
Children should not be allowed to play on or near
the dryer(s). Children should be supervised if near
dryer(s) in operation.
Under no circumstances should the dryer door
switch(es), lint door/drawer switch(es), or heat safety
circuit(s) ever be disabled.
The dryer must never be operated with any of the
back guards, outer tops, or service panels removed.
Personal injury or fire could result.
The dryer must never be operated without the lint
filter/screen in place, even if an external lint collection
system is used.
FOR YOUR SAFETY
Do not dry mop heads in the dryer. Do not use
dryer in the presence of dry cleaning fumes.
The dryers must not be installed or stored in an area
where it will be exposed to water and/or weather.
The wiring diagram for the dryer is located behind
the control panel.
Proposition 65
Use of this product could expose you to substances
from fuel combustion that contain chemicals
known to the State of California to cause cancer,
birth defects and other reproductive harm.
▲ WARNING
!

4 American Dryer Corp. 113431-10
Safety Precautions ____________________
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 loss of life.
The dryer must never be operated with any of the back
guards, outer tops, or service panels removed. Personal
injury or fire could result.
Failure to properly install, maintain, and/or operate dryer
according to this manual and operator’s manuals included
with dryer may result in conditions, which can cause
serious injury, death and/or property damage.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
Purchaser and 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.
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 gas supplier.
Dryers must be exhausted to the outdoors.
Although the manufacturer 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,
combustible detergents, or “all purpose” cleaner.
Explosion could result.
Do not dry rags or articles coated or contaminated with
gasoline, kerosene, oil, paint, or wax. Explosion could
result.
Items that have been spotted or soaked with vegetable or
cooking oil constitute a fire hazard and should not be
placed in a tumble dryer.
Do not dry mop heads. Contamination by wax or
flammable solvents will create a fire hazard.
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 also may be a fire hazard.
A program should be established for the inspection and
cleaning of lint in the burner area, exhaust ductwork, and
area around the back of the dryer. The frequency of inspection
and cleaning can best be determined from experience at
each location.
Do not operate steam dryers with more than 150 psi (10.34
bar) steam pressure. Excessive steam pressure can damage
the steam coil and/or harm personnel.
Replace leaking flexible hoses or other steam fixtures
immediately. Do not operate the dryer with leaking flexible
hoses. Personal injury may result.
Warning
The collection of lint in the burner area and
exhaust ductwork can create a potential fire
hazard.
For personal safety, the dryer must be electrically grounded
in accordance with local and/or country codes. In the absence
of these codes use 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.
Warning
Personal injury or fire could result should the dryer
door switch, lint door/drawer, or heat safety circuit
ever be disabled.
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.
For safety, proper operation, and optimum performance, the
dryer must not be operated with a load less than 66% of its
rated capacity.
Warning
You must disconnect and lockout the electric
supply and the gas supply or the steam supply
before any covers or guards are removed from the
machine to allow access for cleaning, adjusting,
installation, or testing of any equipment per OSHA
standards.
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).
The operation of this appliance may affect the operation of
other types of gas appliances, which take their air for safe
combustion from the same room. If in doubt, consult the
appliance manufacturer(s).
Use this dryer only for its intended purpose, drying fabrics.
!
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113431-10 www.amdry.com 5
The “Cool Down” Cycle of tumble dryers should be used to
reduce the temperature of the items. They should not be
removed from the tumble dryer or piled or stacked while hot.
Fabric softeners or similar products should not be used in a
tumble dryer to eliminate the effects of static electricity, unless
this practice is specifically recommended by the manufacturer
of the fabric softener or product.
Warning
To reduce the risk of personal injury, install
lockable doors to prevent public access to the rear
of the dryers.
Exhaust duct outlet should be checked periodically for
blockages, and if any found, removed.
Important
A means of restraint must be used to prevent
straining of the gas supply when the appliance is
moved.
An external means of power removal (disconnect device)
must be provided by the installer.
CE ONLY
Important
This appliance must only be installed and
operated in the country of destination indicated on
the dryer’s data plate. If the appliance is to be installed and
operated in a country other than the one indicated on the
data plate, a data plate amendment must be obtained from
American Dryer Corporation.
Warning
This appliance must only operate with the gas type
indicated on the dryer’s data plate. If the
appliance is converted (gas type is changed), a data plate
amendment must be obtained from American Dryer
Corporation.
This appliance may cause spillage of products of
combustion from an open-flue appliance fitted in the same
room, and that such an appliance shall be tested for
clearance of products with the appliance in operation and
all windows and doors closed.
!
!
!
!
NOTES ______________________________________________________
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NOTES ______________________________________________________
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6 American Dryer Corp. 113431-10
M31SL Specifications _______________________________________________________________
MAXIMUM CAPACITY (DRY WEIGHT) 30 lb 13.61 kg
TUMBLER DIAMETER 30” 76.20 cm
TUMBLER DEPTH 27” 68.58 cm
TUMBLER VOLUME 11.04 cu ft 312.62 L
TUMBLER/DRIVE MOTOR 1/4 hp 0.19 kW
BLOWER/FAN MOTOR 1/2 hp 0.37 kW
DOOR OPENING (DIAMETER) 19-3/8” 49.21 cm
DOOR SILL HEIGHT 14-7/8” 37.78 cm
WATER CONNECTION 3/4”-11.5 NH
(North America)
3/4” B.S.P.T. (Outside North America)
DRYERS PER 20’/40’ CONTAINER 12 / 28
DRYERS PER 48’/53’ TRUCK 34 / 38
VOLTAGE AVAILABLE 120-240V 1ø 2w 50/60 Hz
APPROXIMATE NET WEIGHT 285 lb 129.27 kg
APPROXIMATE SHIPPING WEIGHT 310 lb 140.61 kg
AIRFLOW 60 Hz 360 cfm 10.19 cmm
50 Hz 300 cfm 8.49 cmm
HEAT INPUT 55,000 Btu/hr 13,860 kcal/hr
EXHAUST CONNECTION (DIAMETER) 6” 15.24 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
INLE T PIPE CONNECTION 1 /2 ” M.N. P. T.
3/8” M.B.S.P.T.
(CE and Australia Only )
VOLTAGE AVAILABLE 200-416V 1,3ø 2,3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 285 lb 129.27 kg
APPROXIMATE SHIPPING WEIGHT 310 lb 140.61 kg
AIRFLOW 60 Hz 360 cfm 10.19 cmm
50 Hz 300 cfm 8.49 cmm
EXHAUST CONNECTION (DIAMETER) 6” 15.24 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
OVEN SIZE
kW Btu/hr kcal/hr
7.9 26,962 6,794
8.3 28,327 7,138
9.0 30,716 7,740
11.3 38,566 9,719
12.4 42,320 10,665
12.5 42,661 10,751
13.5 46,074 11,611
VOLTAGE AVAILABLE 120-240V 1ø 2w 50/60 Hz
APPROXIMATE NET WEIGHT 305 lb 138.35 kg
APPROXIMATE SHIPPING WEIGHT 330 lb 149.69 kg
AIRFLOW 60 Hz 360 cfm 10.19 cmm
50 Hz 300 cfm 8.49 cmm
STEAM CONSUMPTION 63 lb/hr 28.58 kg/hr
OPERATING STEAM PRESSURE 150 psi max 10.34 bar
EXHAUST CONNECTION (DIAMETER) 6” 15.24 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
BOILER HORSEPOWER (NORMAL LOAD) 1.75 Bhp
SUPPLY CONNECTION 1/2” F.N.P.T.
RETURN CONNECTION 1/2” M.N.P.T.
GasElectricSteam
!
Shaded areas are stated in metric equivalents 9/30/05
Note
The manufacturer reserves the right to make changes in specifications at any time without notice or obligation.

113431-10 www.amdry.com 7
M31SL Specifications _______________________________________________________________

8 American Dryer Corp. 113431-10
M50SL Specifications _______________________________________________________________
!
Shaded areas are stated in metric equivalents 4/30/07
Note
The manufacturer reserves the right to make changes in specifications at any time without notice or obligation.
MAXIMUM CAPACITY (DRY WEIGHT) 50 lb 22.68 kg
TUMBLER DIAMETER 37” 93.98 cm
TUMBLER DEPTH 25-3/4” 65.41 cm
TUMBLER VOLUME 16.02 cu ft 453.64 L
TUMBLER/DRIVE MOTOR 3/4 hp 0.56 kW
BLOWER/FAN MOTOR 1/2 hp 0.37 kW
DOOR OPENING (DIAMETER) 27-3/8” 69.53 cm
DOOR SILL HEIGHT 16” 40.64 cm
WATER CONNECTION 3/4”-11.5 NH (North America)
3/4” B.S.P.T. (Outside North America)
DRYERS PER 20’/40’ CONTAINER 10 / 22
DRYERS PER 48’/53’ TRUCK 28 / 30
VOLTAGE AVAILABLE 120-240V 1ø 2w 50/60 Hz
APPROXIMATE NET WEIGHT 545 lb 247.21 kg
APPROXIMATE SHIPPING WEIGHT 565 lb 256.28 kg
AIRFLOW 60 Hz 525 cfm 14.87 cmm
50 Hz 437 cfm 12.37 cmm
HEAT INPUT 90,000 Btu/hr 22,680 kcal/hr
EXHAUST CONNECTION (DIAMETER) 8” 20.32 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
INLET PIPE CONNECTION 1/2” M.N.P.T.
1/2” F.B.S.P.T. (CE and Australia Only)
VOLTAGE AVAILABLE 120-600V 1,3ø 2,3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 545 lb 247.21 kg
APPROXIMATE SHIPPING WEIGHT 565 lb 256.28 kg
AIRFLOW 60 Hz 525 cfm 14.87 cmm
50 Hz 437 cfm 12.37 cmm
EXHAUST CONNECTION (DIAMETER) 8” 20.32 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
OVEN SIZE
kW Btu/hr kcal/hr
13.4 45,869 11,559
14.7 50,136 12,634
14.8 50,545 12,737
16.0 54,606 13,761
VOLTAGE AVAILABLE 120-240V 1ø 2w 50/60 Hz
APPROXIMATE NET WEIGHT 545 lb 247.21 kg
APPROXIMATE SHIPPING WEIGHT 565 lb 256.28 kg
AIRFLOW 60 Hz 525 cfm 14.87 cmm
50 Hz 437 cfm 12.37 cmm
STEAM CONSUMPTION 127.5 lb/hr 57.83 kg/hr
OPERATING STEAM PRESSURE 150 psi max 10.34 bar
EXHAUST CONNECTION (DIAMETER) 8” 20.32 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
BOILER HORSEPOWER (NORMAL LOAD) 3.75 Bhp
SUPPLY CONNECTION 3/4” F.N.P.T.
RETURN CONNECTION 3/4” M.N.P.T.
Gas
Electric
Steam

113431-10 www.amdry.com 9
M50SL Specifications _______________________________________________________________

10 American Dryer Corp. 113431-10
M75SL Specifications _______________________________________________________________
MAXIMUM CAPACITY (DRY WEIGHT) 75 lb 34.02 kg
TUMBLER DIAMETER 37” 93.98 cm
TUMBLER DEPTH 35-1/2” 90.17 cm
TUMBLER VOLUME 22.09 cu ft 625.52 L
TUMBLER/DRIVE MOTOR 3 /4 hp 0.56 kW
BLOWER/FAN MOTOR 1/2 hp 0.37 kW
DOOR OPENING (DIAMETER) 27-3/8 ” 69.53 cm
DOOR SILL HEIGHT 16 ” 40.64 cm
WATER CONNECTION 3/4”-11.5 NH
(North America)
3/4” B.S.P.T. (Outside North America)
DRYERS PER 20’/40’ CONTAINER 9 / 20
DRYERS PER 48’/53’ TRUCK 25 / 27
VOLTAGE AVAILABLE 120-240V 1ø 2w 50/60 Hz
APPROXIMATE NET WEIGHT 600 lb 272.16 kg
APPROXIMATE SHIPPING WEIGHT 620 lb 281.23 kg
AIRFLOW 60 Hz 560 cfm 15.86 cmm
50 Hz 466 cfm 13.19 cmm
HEAT INPUT 110,000 Btu/hr 27,720 kcal/hr
EXHAUST CONNECTION (DIAMETER) 8” 20.32 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
INLET PIPE CONNECTION 1/2” M.N.P.T.
1/2” F.B.S.P.T.
(CE and Australia Only )
VOLTAGE AVAILABLE 200-416V 1,3ø 2,3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 600 lb 272.16 kg
APPROXIMATE SHIPPING WEIGHT 620 lb 281.23 kg
AIRFLOW 60 Hz 560 cfm 15.86 cmm
50 Hz 466 cfm 13.19 cmm
EXHAUST CONNECTION (DIAMETER) 8” 20.32 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
OVEN SIZE
kW Btu/hr kcal/hr
18.5 63,105 15,902
20.3 69,000 17,000
22.0 75,084 18,921
VOLTAGE AVAILABLE 120-240V 1ø 2w 50/60 Hz
APPROXIMATE NET WEIGHT 600 lb 272.16 kg
APPROXIMATE SHIPPING WEIGHT 620 lb 281.23 kg
AIRFLOW 60 Hz 560 cfm 15.86 cmm
50 Hz 466 cfm 13.19 cmm
STEAM CONSUMPTION 136 lb/hr 61.69 kg/hr
OPERATING STEAM PRESSURE 150 psi max 10.34 bar
EXHAUST CONNECTION (DIAMETER) 8” 20.32 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
BOILER HORSEPOWER (NORMAL LOAD) 4 Bhp
SUPPLY CONNECTION 3/4” F.N.P.T.
RETURN CONNECTION 3/4” M.N.P.T.
!
Shaded areas are stated in metric equivalents 4/30/07
Note
The manufacturer reserves the right to make changes in specifications at any time without notice or obligation.
Gas
Electric
Steam

113431-10 www.amdry.com 11
M75SL Specifications _______________________________________________________________

12 American Dryer Corp. 113431-10
Unpacking/Setting Up _________________
Remove protective shipping material (i.e., plastic wrap and
optional shipping box) from the dryer.
Important
Dryer must be transported and handled in an
upright position at all times.
The dryer can be moved to its final location while still attached
to the skid or with the skid removed. To remove the skid from
the M31SL, M50SL, or M75SL, locate and remove the 2 bolts
securing the base of the dryer to the wooden skid. One is
located at the center rear and the other is at the center front.
With the skid removed, use caution and assure all four
leveling legs are fully retracted, if the dryer is to be slid into its
final position.
Leveling Dryer
The dryer is equipped with 4 leveling legs, 1 at each corner of
the base. For optimum performance the dryer should be
level front-to-back and side-to-side.
Dryer Enclosure Requirements _______
Commercial Type II (M31SL, M50SL, M75SL)
Bulkheads and partitions should be made of noncombustible
material.
Note
Allowances must be made for opening the control
door.
A The requirement to allow the door to open completely for
the M31SL is 33-inches (83.8 cm), and the M50SL and
M75SL are 40-inches (101.6 cm).
B A minimum overhead clearance of 6-inches (15.24 cm)
is required.
C Dryer should be positioned a minimum of 12-inches
(30.48 cm) away from the nearest obstruction. 24-inches
(60.96 cm) is recommended for ease of installation,
maintenance, and service.
D 1/16” (1.5875 mm) minimum is required.
E Flooring should be level or below dryer cabinet for ease
of removing panels during maintenance.
F 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.
!
Installation Procedures _______________
Installation should be performed by competent professional
in accordance with local, state, and country 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 (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).
Location Requirements _______________
Before installing the dryer, be sure the location conforms to
local, state, and country codes. 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).
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.
The dryer must not be installed or stored in an area where it
will be exposed to water and/or weather.
Dryers installed in residential garages must be elevated
18-inches (45.72 cm) above the floor.
Provisions for adequate air supply must be provided as noted
in this manual (refer to Fresh Air Supply Requirements
section).
Clearance provisions must be made from combustible
construction as noted in this manual (refer to Dryer Enclosure
Requirements section).
Provisions must be made for adequate clearances for
servicing and for operation as noted in this manual (refer to
Dryer Enclosure Requirements section).
The dryer must be installed with a proper exhaust duct
connection to the outside as noted in this manual (refer to
Exhaust Requirements section).
The dryer must be located in an area where correct exhaust
venting can be achieved as noted in this manual (refer to
Exhaust Requirements section).
Important
The dryer should be located where a minimum
amount of exhaust ducting will be necessary.
The dryer must be installed with adequate clearance for air
openings into the combustion chamber.
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).
!
!
!
!

113431-10 www.amdry.com 13
Domestic Type I (M31SL, M50SL Only)
!
!
!
!
A = 10-inches (25.4 cm) B = 11-inches (27.94 cm)
EXAMPLE: For a bank of 4 M31SL dryers, 2 unrestricted
openings measuring 10-inches by 11-inches (25.4 cm by
27.94 cm) are acceptable.
Important
Make-up air must be free of dry cleaning solvent
fumes. Make-up air that is contaminated by dry
cleaning solvent fumes will result in irreparable damage to
the motors and other dryer components.
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.
A = 6-inches (15.24 cm) B = 24-inches (60.96 cm)
EXAMPLE: For M50SL, 2 unrestricted openings measuring
6-inches by 24-inches (15.24 cm by 60.96 cm) are acceptable.
If a closet door is installed: unobstructed air openings are
required. The air openings shall be located 3-inches
(7.62 cm) from the lower opening (above floor level) and upper
opening (below ceiling). The total free area of the air openings
in the door shall not be less than 179 inch2(1154.836 cm2)
for M31SL; and 293 inch2(1890.319 cm2) for M50SL. Louvered
doors with equivalent air openings are acceptable.
No other fuel-burning appliance shall be installed in the same
closet as the dryer.
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 (make-up air) must be given careful consideration
to ensure proper performance of each dryer. Fresh air
ventilation openings shall not be blocked and/or sealed. As
a general rule, an unrestricted air entrance from the outdoors
of 110 inch2(710 cm2) is required for each M75SL, 90 inch2
(580 cm2) for each M50SL, and 55 inch2(354 cm2) for each
M31SL. (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 near where 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.

14 American Dryer Corp. 113431-10
!
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.
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 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.
A = 20 feet (6.10 meters)
B = M31SL: 6-inches (15.24 cm)
M50SL, M75SL: 8-inches (20.32 cm)
!
!
C = 12 feet (3.66 meters)
D = M31SL: 6-inches (15.24 cm)
M50SL, M75SL: 8-inches (20.32 cm)
!
Important
Exhaust back pressure measured by a
manometer/magnehelic in the exhaust duct must
be no less than 0 and must not exceed 0.6 in wc (1.48 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.
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.
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 HVAC firm
should be consulted for proper venting information.
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 6-inches (15.24 cm) for M31SL
and 8-inches (20.32 cm) for M50SL and M75SL. 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.
!
Vertical Venting
When vertical dryer venting is used, the length of the ductwork
from the dryer to the outside exhaust outlet, must not exceed
12 feet (3.66 meters). The minimum diameter of this ductwork
must be at least 6-inches (15.24 cm) for M31SL and 8-inches
(20.32 cm) for M50SL and M75SL. 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.

113431-10 www.amdry.com 15
Important
No more than 4 dryers 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.
!
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.
A = M31SL 6-inch (15.24 cm)
M50SL 8-inch (20.32 cm)
M75SL 8-inch (20.32 cm)
B = 12 feet (3.656 meters)
Electrical Information _________________
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, state, and
national regulations or codes of the country of origin. 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, which could cause a
fire hazard. The copper conductor wire/cable must be of proper
ampacity and insulation in accordance with electric codes
for making all service connections.
Note
The use of aluminum wire will void the warranty.
An individual ground circuit must be provided to
each dryer, do not daisy chain.
Component failure due to improper voltage application will
void the warranty.
The manufacturer reserves the right to make changes in
specifications at any time without notice or obligation.
Important
A separate protected circuit must be provided to
each dryer.
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.
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.
!
!
!
!
!
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 120 120 80 54
SQ CM 774.2 774.2 516.1 348.4
MINIMUM ROUND
DUCT DIAMETER
IN 12 12 10 8
CM 30.48 30.48 25.4 20.32
Multiple Dryer Venting with 8-Inch (20.32 cm) Diameter
525 cfm (14.87 cmm) Exhaust Connections at Common Duct
M50SL
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 120 120 80 54
SQ CM 774.2 774.2 516.1 348.4
MINIMUM ROUND
DUCT DIAMETER
IN 12 12 10 8
CM 30.48 30.48 25.4 20.32
Multiple Dryer Venting with 8-Inch (20.32 cm) Diameter
560 cfm (15.86 cmm) Exhaust Connections at Common Duct
M75SL
NUMBER OF DRYERS 4 3 2 1
MINIMUM CROSS-
SECTIONAL AREA
SQ IN 80 80 54 30
SQ CM 516.1 516.1 348.4 193.55
MINIMUM ROUND
DUCT DIAMETER
IN 10 10 8 6
CM 25.4 25.4 20.32 15.24
M31SL
Multiple Dryer Venting with 6-Inch (15.24 cm) Diameter
360 cfm (10.19 cmm) Exhaust Connections at Common Duct

16 American Dryer Corp. 113431-10
Electric Models Only
All electrically heated dryers must be connected to the electric
service shown on the dryer’s data label. The connecting
wires must be properly sized to handle the rated current.
Warning (Gas Models Only)
Dryers built for use with a voltage between 200
and 240 must verify the input voltage during
!
TERM LINE VOLTAGE
50 Hz 60 Hz
HIGH
260
226
283
249
MED
239
208
260
230
LOW
217
189
236
208
ELECTRICAL SERVICE SPECIFICATIONS
IMPORTANT:
NOTES: A.
B.
C.
208 VAC AND 230/240 VAC ARE NOT THE SAME. When ordering, specify
exact voltage.
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) 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
OVEN
kW
APPROX.
AMP DRAW CIRCUIT
BREAKER
60 Hz 50 Hz
M31SL
200 1ø 2 12.5 68.4 67.7 90
208 1ø 2 7.9 43.8 — 60
208 1ø 2 13.5 70.7 — 90
230 1ø 2 8.3 — 41.3 60
230 1ø 2 12.4 — 59.1 80
240 1ø 2 9.0 42.7 — 60
240 1ø 2 13.5 61.5 — 80
208 3ø 3 13.5 43.3 — 60
220 3ø 3 11.3 35.3 — 50
230 3ø 3 12.4 — 36.5 50
240 3ø 3 13.5 37.7 — 50
380 3ø 4 11.3 22.8 22.6 40
400 3ø 4 12.4 — 23.1 40
416 3ø 4 13.5 — 23.7 40
M50SL
200 1ø 2 14.8 82.1 — 110
208 1ø 2 16.0 85.1 — 110
220 1ø 2 13.4 68.8 69.4 90
230 1ø 2 14.7 — 72.3 100
240 1ø 2 16.0 74.2 75.1 100
200 3ø 3 14.8 — 51.0 70
208 3ø 3 16.0 52.6 — 70
220 3ø 3 13.4 43.0 43.6 60
230 3ø 3 14.7 — 45.3 60
240 3ø 3 16.0 46.0 — 60
380 3ø 4 13.4 28.0 28.6 40
400 3ø 4 14.8 — 29.8 40
416 3ø 4 16.0 — 30.7 40
M50SL Dual Voltage 480 / 120
120 1ø 2 0.0 13.2 — 15
480 3ø 3 16.0 19.2 — 25
M50SL Dual Voltage 480 / 240
240 1ø 2 0.0 6.5 — 15
480 3ø 3 16.0 19.2 — 25
M50SL Dual Voltage 600 / 120
120 1ø 2 0.0 13.2 — 15
600 3ø 3 16.0 15.4 — 20
M50SL Dual Voltage 600 / 240
240 1ø 2 0.0 6.5 — 15
600 3ø 3 16.0 15.4 — 20
M75SL
200 1ø 2 20.3 109.8 — 150
208 1ø 2 22.0 113.9 — 150
220 1ø 2 18.5 91.7 92.3 125
230 1ø 2 20.3 — 96.3 125
240 1ø 2 22.0 99.2 — 125
208 3ø 3 22.0 69.2 — 90
220 3ø 3 18.5 56.2 56.8 80
230 3ø 3 20.3 — 59.1 80
240 3ø 3 22.0 60.4 — 80
380 3ø 4 18.5 35.6 — 45
380 3ø 4 18.5 — 36.2 50
400 3ø 4 20.3 — 37.8 50
416 3ø 4 22.0 — 39.1 50
6/4/08
installation. If the nominal voltage
is outside of the medium
tolerances shown on the diagram
below, adjust the autotransformer,
located near the burner assembly.
To adjust the autotransformer
wiring, place the red wire on the
appropriate tap (HIGH, MED,
LOW) of the autotransformer. For
additional wiring details, refer to the electrical diagram
located on the inside of the control panel.
Electrical Service Specifications
Gas and Steam Models Only
6/4/08
ELECTRICAL SERVICE SPECIFICATIONS
IMPORTANT:
NOTES: A.
B.
C.
208 VAC AND 230/240 VAC ARE NOT THE SAME. When ordering, specify
exact voltage.
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
APPROX.
AMP DRAW CIRCUIT
BREAKER
60 Hz 50 Hz
M31SL Gas
120 1ø 2 10.3 — 15
200 1ø 2 8.7 8.8 15
208 1ø 2 8.4 — 15
220 1ø 2 8.1 8.1 15
230 1ø 2 — 7.4 15
240 1ø 2 7.7 7.0 15
M31SL Steam
120 1ø 2 9.3 — 15
208 1ø 2 6.2 6.0 15
220 1ø 2 5.6 5.5 15
230 1ø 2 — 5.4 15
240 1ø 2 5.1 — 15
M50SL Gas
120 1ø 2 15.6 — 20
200 1ø 2 10.5 — 20
208 1ø 2 10.5 — 20
220 1ø 2 10.0 10.7 20
230 1ø 2 — 10.8 20
240 1ø 2 9.7 — 20
M50SL Steam
120 1ø 2 14.4 — 20
200 1ø 2 8.2 — 20
208 1ø 2 8.2 — 20
220 1ø 2 7.8 8.4 20
230 1ø 2 — 8.5 20
240 1ø 2 7.6 — 20
M75SL Gas
120 1ø 2 15.6 — 20
200 1ø 2 10.5 — 20
208 1ø 2 10.5 — 20
220 1ø 2 10.0 10.7 20
230 1ø 2 — 10.8 20
240 1ø 2 9.7 — 20
M75SL Steam
120 1ø 2 14.4 — 20
200 1ø 2 8.2 — 20
208 1ø 2 8.2 — 20
220 1ø 2 7.8 8.4 20
230 1ø 2 — 8.5 20
240 1ø 2 7.6 — 20

113431-10 www.amdry.com 17
Grounding
A ground (earth) connection must be provided and installed
in accordance with local, state, and national regulations or
codes of the country of origin. 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.
Warning
Electrical Grounding Instructions – This dryer is
equipped with a 3-prong (grounding) plug for your
protection against shock hazard and should be plugged
directly into a properly grounded 3-prong receptacle. Do
not cut or remove the grounding prong from this plug.
Electrical Connections
A wiring diagram is located behind the control panel for
connection data.
If local codes permit, power to the dryer can be made by the
use of a flexible UL 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.
For CE Models Only
The means for disconnection from the supply must be
incorporated into wiring having a minimum contact separation
of 3.0 mm in all poles.
Single-Phase (1ø)
Wiring Connections/Hookup
The electrical input connections are made into the rear service
box located at the upper right area of the dryer. The ground
connection is made to the copper lug, also provided in this
box. To gain access, the service box cover must be removed.
!
200-240V Application without Neutral
!
Caution
The dryer must be grounded. A ground lug has
been provided for this purpose.
Input connection wiring must be sized properly to handle the
dryer’s current draw. This information is printed on the dryer’s
data label.
Important
A strain relief must be used where the input wiring
enters the oven assembly.
Electrically Heated Models Only
The electrical input connections are made at the rear service
box located at the right upper section of the dryer. The ground
connection is made to a copper lug also provided in this
area. To gain access, remove rear service cover.
The only electrical input connections to the dryer are the
3-phase (3ø) power leads (L1, L2, L3, and sometimes neutral)
and ground. Single-phase (1ø) power for the control circuit
and for any single-phase (1ø) motors (if present) is done
internally to the dryer by the factory at the oven contactor. No
single-phase (1ø) input connection is required on a 3-phase
(3ø) dryer.
The neutral will only be used on 4-wire service. This is typical
for 380-416V, 50 Hz.
Caution
The dryer must be grounded. A ground lug has
been provided for this purpose.
Input connection wiring must be sized properly to handle the
dryer’s current draw. This information is printed on the dryer’s
data label.
!
!
!
Gas and Steam Models Only
120-240V Application with Neutral

18 American Dryer Corp. 113431-10
!
!
Gas Information _______________________
It is your responsibility to have all plumbing connections,
materials, and workmanship conform to local and state
regulations or codes of the country of destination. In the
absence of such codes, all plumbing connections, materials,
and workmanship must conform to the applicable local
requirements. In the USA this is 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/CGAB149.2-M91 (L.P. Gas) or LATEST EDITION.
In Australia, the fuel gas code is AS 5601/AG 601, local
authority, gas, electricity, and any other relevant statutory
regulations.
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.
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.
Electric Models Only
Single-Phase (1ø) Wiring Connections/Hookup
!
!
!
Important
For ease of service, the individual gas supply line
of each dryer must have its own manual shutoff
valve.
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) for non-CE dryers or 50 mb for CE
dryers.
Failure to isolate or disconnect the dryer from supply as
noted can cause irreparable damage to the gas valve,
voiding the warranty.
Note
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) for non-CE dryers or 50 mb for CE dryers.
Warning
Fire or explosion could result due to failure of
isolating or disconnecting the gas supply as noted.
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 data label and pressure must be confirmed. If this
information does not agree with the type of gas available, do
not operate the dryer. Contact the reseller who sold the dryer
or contact the manufacturer.
The input ratings shown on the data label are for elevations
up to 2,000 feet (610 meters), unless elevation requirements
of over 2,000 feet (610 meters) were specified at the time the
dryer order was placed with the factory. The adjustment or
conversion of dryers in the field for elevations over 2,000 feet
(610 meters) is made by changing each burner orifice. If this
conversion is necessary, contact the reseller who sold the
dryer or contact the manufacturer.
Important
If connection to this appliance is made with a
flexible hose, it must be suitable for the appliance
category in accordance with national installation
regulations of the country of destination, and if in doubt the
installer must contact the supplier. The manufacturer of
this appliance does not recommend the use of flexible gas
supply line/hose. An external gas supply shutoff must be
provided.
CE and Australian Dryers
There is an N.P.T. to B.S.P.T. adaptor included with each dryer,
which must be installed to the gas inlet. The adaptor is
shipped in the tumbler.
Important
Pipe joint compounds that resist the action of
natural, propane, and butane gases must be used.
!
!
3-Phase (3ø) Wiring Connections/Hookup

113431-10 www.amdry.com 19
Gas Specifications for CE Approved Dryers**
Model Gas
Type
Nominal
Heating Value
Supply
Pressure
Gross
Heat Input Fuel
Consumption
Orifice Size Orifice
(Injector)
Quantity
Burner
Pressure
Btu/ft
3
mb Btu/hr kW DMS mm mb
Natural (I
2H
/I
2E
)1,000 15-30 55,000 16.12 1.557 M
3
/H 22 3.988 16.9
Natural (I
2L
)830
20-35 55,000 16.12 1.876 M
3
/H 22 3.988 19.5
Natural (I
2ELL
)830 15-30 55,000 16.12 1.876 M
3
/H 22 3.988 19.5
*Natural (I
2E+
)1,000 20 55,000 16.12 1.557 M
3
/H 31 3.048 1—
830 25 55,000 16.12 1.876 M
3
/H 31 3.048 1—
*Butane (I
3+
)3,175
28-30 55,000 16.12 1.162 kg/H 48 1.930 1—
*Propane (I
3+
)2,500 37 55,000 16.12 1.162 kg/H 48 1.930 1—
Butane (I
3B/P
)3,175
28-30/50 55,000 16.12 1.162 kg/H 44 2.184 118.1
Propane (I
3P
)2,500
28-30/50 55,000 16.12 1.162 kg/H 44 2.184 124.9
Natural (I
2H
/I
2E
)1,000 15-30 90,000 26.38 2.549 M
3
/H 29 3.454 27.2
Natural (I
2L
)830
20-35 90,000 26.38 3.071 M
3
/H 29 3.454 28.9
Natural (I
2ELL
)830 15-30 90,000 26.38 3.071 M
3
/H 29 3.454 28.9
*Natural (I
2E+
)1,000 20 90,000 26.38 2.549 M
3
/H 35 2.794 2—
830 25 90,000 26.38 3.071 M
3
/H 35 2.794 2—
*Butane (I
3+
)3,175
28-30 90,000 26.38 1.901 kg/H 50 1.778 2—
*Propane (I
3+
)2,500 37 90,000 26.38 1.901 kg/H 50 1.778 2—
Butane (I
3B/P
)3,175
28-30/50 90,000 26.38 1.901 kg/H 47 1.994 218.1
Propane (I
3P
)2,500
28-30/50 90,000 26.38 1.901 kg/H 47 1.994 224.9
Natural (I
2H
/I
2E
)1,000 15-30 110,000 32.24 3.115 M
3
/H 22 3.988 26.9
Natural (I
2L
)830
20-35 110,000 32.24 3.753 M
3
/H 22 3.988 29.5
Natural (I
2ELL
)830 15-30 110,000 32.24 3.753 M
3
/H 22 3.988 29.5
*Natural (I
2E+
)1,000 20 110,000 32.24 3.115 M
3
/H 31 3.048 2—
830 25 110,000 32.24 3.753 M
3
/H 31 3.048 2—
*Butane (I
3+
)3,175
28-30 110,000 32.24 2.324 kg/H 48 1.930 2—
*Propane (I
3+
)2,500 37 110,000 32.24 2.324 kg/H 48 1.930 2—
Butane (I
3B/P
)3,175
28-30/50 110,000 32.24 2.324 kg/H 44 2.184 218.1
Propane (I
3P
)2,500
28-30/50 110,000 32.24 2.324 kg/H 44 2.184 224.9
Gas Specifications for Non-CE and Non-AGA Approved Dryers**
Model Gas
Type
Nominal
Heating Value
Supply
Pressure
Gross
Heat Input Orifice Size Orifice
(Injector)
Quantity
Burner
Pressure
Btu/ft
3
in WC Btu/hr kW DMS mm in WC
M31SL
Natural 1,000 7.0-13.0 55,000 16.12 20 4.089 13.0
*Liquid Propane 2,500 11.0 55,000 16.12 44 2.184 110.0
M50SL
Natural 1,000 7.0-13.0 90,000 26.38 29 3.454 23.0
*Liquid Propane 2,500 11.0 90,000 26.38 47 2.994 210.0
M75SL
Natural 1,000 7.0-13.0 110,000 32.24 22 3.988 23.0
*Liquid Propane 2,500 11.0 110,000 32.24 44 2.184 210.0
Heat Input/Gas Consumption/Orifice (Injector) Data
(For Non-CE [European] and Non-AGA [Australia] Models Only)
Shaded areas are stated in metric equivalents
* Gas valve’s internal regulator disabled.
** Consult factory for elevations over 2,000 feet (610 meters) for correct orifice size.
Heat Input/Gas Consumption/Orifice (Injector) Data (For CE [European] Models Only)
M31SL
M50SL
M75SL
Shaded areas are stated in metric equivalents
* Gas valve’s internal regulator disabled.
** Consult factory for elevations over 2,000 feet (610 meters) for correct orifice size.

20 American Dryer Corp. 113431-10
Piping/Connections
CE and Australian dryer connections will be B.S.P.T., all others will be N.P.T.
There should be a minimum 6-inch (15.24 cm) clearance
between the back guard and the first bend in the gas piping
for ease of servicing. It is recommended that a gas shutoff
valve be provided to the gas supply line of each dryer for ease
in servicing.
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 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.
!
TYPICAL L.P. GAS INSTALLATION
Consistent gas pressure is essential at all gas connections.
It is recommended that a 3/4-inch (19.05 mm) 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 13.0 in wc
(32.34 mb) pressure.
A plugged tap, accessible for a pressure gauge connection,
must be installed in the main gas supply line immediately
upstream of the dryers.
Important
Pipe joint compounds that resist the action of
natural, L.P., and butane gases must be used.
Test all connections for leaks by brushing on a soapy water
solution (liquid detergent works well).
Warning
Never test for leaks with a flame!!!
!
!
M31SL M50SL M75SL
1/2” 1/2” 1/2”
TYPICAL NATURAL GAS INSTALLATION
Heat Input/Gas Consumption/Orifice (Injector) Data (For AGA [Australian] Models Only)*
Shaded areas are stated in metric equivalents
* Consult factory for elevations over 2,000 feet (610 meters) for correct orifice size.
Gas Specifications for AGA Approved Dryers (Australia)
Model Gas
Type
Supply
Pressure
Gross
Heat Input Orifice Size Orifice
(Injector)
Quantity
Burner
Pressure
kPa MJ/h DMS mm kPa
M31SL Natural 1.7-3.2 58.03 22 3.988 10.69
Propane 2.75 58.03 44 2.184 12.49
M50SL Natural 1.7-3.2 94.96 29 3.454 20.72
Propane 2.75 94.96 47 1.994 22.49
M75SL Natural 1.7-3.2 116.06 22 3.988 20.69
Propane 2.75 116.06 44 2.184 22.49