MAXIDRY MAXI120 User manual

MAXI120 Installation Manual
Extended Side Panels – Phase 7 / Dual Timer
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.
Maxidry
Part No. 113257-4

2113257-4
“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) __________________________________________________________________________________
____________________________________________________________________________________________________
____________________________________________________________________________________________________
These instructions are only valid if the following country code is on the appliance… If this code is not present on the
appliance, it is necessary to refer to the technical instructions which will provide the necessary information concerning
the modification of the appliance to the condition of use for the country.
In accordance with EN ISO 3166-1, the names of countries shall be represented by the following codes:
GB United Kingdom
IE Ireland
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.
MAXI120

113257-4 3
Safety Precautions ............................................ 4
Specifications .................................................... 6
Component Identification ................................. 9
Installation Procedures .................................... 9
Location Requirements .............................................. 9
Unpacking / Setting Up ............................................ 10
Dryer Enclosure Requirements ................................10
Fresh Air Supply Requirements ............................... 11
Exhaust Requirements ............................................. 11
Electrical Information................................................ 14
Gas Information ........................................................ 15
Steam Information .................................................... 18
Water Information ..................................................... 21
Preparation for Operation ......................................... 22
Preoperational Test ................................................... 23
Preoperational Instructions ......................................24
Compressed Air Requirements ................................24
Shutdown Instructions .............................................. 25
Service / Parts Information ............................. 25
Service ...................................................................... 25
Parts ..........................................................................25
Routine Maintenance ...................................... 25
Cleaning ....................................................................25
Adjustments .............................................................. 26
Lubrication ................................................................ 26
Data Label Information ................................... 26
Procedure for Functional Check
of Replacement Components ........................ 27
Manual Reset Burner Hi-Limit Instructions .. 28
Phase 7 ..................................................................... 28
Dual Timer .................................................................28
Non-Coin Programming .................................. 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 dryers in operation.
Under no circumstances should the dryer door switch(es), lint
door/drawer switch(es), or heat safety circuit(s) ever be disabled.
Do not modify this appliance.
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.
Do not operate this appliance before reading the instruction
booklet.
Do not place articles on or against this appliance.
If the hi-limit switch trips, a service call is required to investigate
the reason and resolve the issue.
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 or weather.
The wiring diagram for the dryer is located in the front electrical
control box area.
Table of Contents ______________
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.
!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.
List of Acronyms _____________________
DSI Direct Spark Ignition
HVAC Heating, Ventilating, and Air-Conditioning
in WC Inches of Water Column
L.E.D. Light Emitting Diode
L.P. Liquid Propane
OSHA Occupational Safety and Health Administration
UL Underwriters Laboratory
!WARNING

4113257-4
Dry only water washed fabrics. Do not dry articles
spotted or washed in dry cleaning solvents, a
combustible detergent, industrial chemicals, 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 may be a fire hazard.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
Do not spray aerosols in the vicinity of this appliance while it
is in operation.
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.
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.
Dryer(s) 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.
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.
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.
Safety Precautions ___________________
!WARNING
The possible presence of residual quantities of aggressive
or decomposed chemicals in the load may produce damage
to the machine and harmful fumes.
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.
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 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.
Under no circumstances should the dryer door switch, lint
drawer switch, heat safety circuits ever be disabled.
This dryer is not to be used in the presence of dry cleaning
solvents or fumes.
Remove articles from the dryer as soon as the drying cycle
has been completed.
Articles left in the dryer after the drying and cooling
cycles have been completed can create a fire hazard.
Do not operate steam dryers with more than 125 psi (8.62
bar, 862 kPa) steam pressure. Excessive steam pressure
can damage 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.
Read and follow all caution and direction labels attached to
the dryer.
For safety, proper operation, and optimum performance, the
dryer must not be operated with a load less than sixty-six
percent, 79 lb (35.4 kg) of its rated capacity.
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.
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
Personal injury or fire could result should the dryer
door switch, lint door/drawer, or heat safety circuit
ever be disabled.

113257-4 5
NOTES _____________________________________________________
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____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
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.
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 the static electricity,
unless this practice is specifically recommended by the
manufacturer of the fabric softener or product.
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
Maxidry.
IEC335 applies.
!WARNING
To reduce the risk of personal injury, install lockable
doors to prevent public access to the rear of the
dryers.
Do not use or store flammable materials in the
appliance storage drawer or near this appliance.
Do not spray aerosols in the vicinity of this appliance
while it is in operation.
Do not modify this appliance.
!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 Maxidry.
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.
Disconnect power before resetting the hi-limit. The
hi-limit is located on the left side of the burner box,
looking at the box from the back of the dryer. Press
and release and the hi-limit will reset.

6113257-4
MAXIMUM CAPACITY (DRY WEIGHT) 120 lb 54.43 kg
TUMBLER DIAMETER 44-5/8” 113.35 cm
TUMBLER DEPTH 42-1/8” 107.00 cm
TUMBLER VOLUME 38.10 cu ft 1,078.87 L
TUMBLER/DRIVE MOTOR 3/4 hp 0.56 kW
BLOWER/FAN MOTOR 3 hp 2.24 kW
DOOR OPENING (DIAMETER) 31-3/8” 79.69 cm
DOOR SILL HEIGHT 25-7/8” 65.72 cm
WATER CONNECTION 3/4”-11.5 NH
(North America)
3/4” B.S.P.T. (Outside North America)
DRYERS PER 20’/40’ CONTAINER 3 / 7
DRYERS PER 48’/53’ TRUCK 9 / 10
VOLTAGE AVAILABLE 208-575V 3ø 3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 1,440 lb 653.17 kg
APPROXIMATE SHIPPING WEIGHT 1,500 lb 680.4 kg
AIRFLOW 60 Hz 2,150 cfm 60.88 cmm
50 Hz 1,791 cfm 50.71 cmm
HEAT INPUT 375,000 Btu/hr 94,498 kcal/hr
EXHAUST CONNECTION (DIAMETER) 14” 35.56 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
INLET PIPE CONNECTION 1” F.N.P.T.
1” F.B.S.P.T.
(CE and Australia Only)
VOLTAGE AVAILABLE 208-575V 3ø 3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 1,500 lb 680.4 kg
APPROXIMATE SHIPPING WEIGHT 1,555 lb 705.3 kg
AIRFLOW 60 Hz 2,150 cfm 60.88 cmm
50 Hz 1,791 cfm 50.71 cmm
EXHAUST CONNECTION (DIAMETER) 14” 35.56 cm
COMPRESSED AIR CONNECTION N / A
COMPRESSED AIR VOLUME N / A
OVEN SIZE
kW Btu/hr kcal/hr
72 245,700 61,900
75.6 258,000 65,000
VOLTAGE AVAILABLE 208-575V 3ø 3,4w 50/60 Hz
APPROXIMATE NET WEIGHT 1,730 lb 784.7 kg
APPROXIMATE SHIPPING WEIGHT 1,790 lb 811.9 kg
AIRFLOW 60 Hz 2,150 cfm 60.88 cmm
50 Hz 1,791 cfm 50.71 cmm
STEAM CONSUMPTION
†
450 lb/hr 204.12 kg/hr
OPERATING STEAM PRESSURE
†
125 psi max 8.62 bar, 862 kPa
EXHAUST CONNECTION (DIAMETER) 14” 35.56 cm
COMPRESSED AIR CONNECTION** 1/8” N.P.T.
COMPRESSED AIR VOLUME** 0.75 cfh 0.02 cmh
BOILER HP (NORMAL LOAD)
†
13 Bhp
STANDARD SUPPLY CONNECTIONS
††
(2) 1-1/4” M.N.P.T.
STANDARD RETURN CONNECTIONS
††
(2) 1” M.N.P.T.
Specifications _____________________________________________________________________
NOTE: The manufacturer reserves the right to make changes in specifications at any time without notice or obligation.
GAS
ELECTRIC
STEAM*
Shaded areas are stated in metric equivalents 9/25/13
* Air-operated steam damper system must be provided with clean, dry and regulated 80 psi +/- 10 psi (5.51 bar
+/- 0.69 bar) air supply.
** Compressed air is not required with optional steam solenoid valve.
† Refer to page 18, for optional steam pressure, consumption and boiler horsepower.
†† Refer to page 8 and 18 for optional steam connections.

113257-4 7
Specifications _____________________________________________________________________
NOTE: The manufacturer reserves the right to make changes in specifications at any time without notice or obligation.

8113257-4
NOTE: The manufacturer reserves the right to make changes in specifications at any time without notice or obligation.
Specifications _____________________________________________________________________
STEAM WITH OPTIONAL ONE-STAGE STEEL STEAM COIL

113257-4 9
Illus. No. Description
1Microprocessor Control/Keypad Panel Assembly (controls)
2Control (top access) Door Assembly
3Main Door Assembly
4Lint Door Assembly
5Lint Drawer
6Wire Diagram (located behind control door)
7Top Console (module) Assembly
Dryer Rear View
Component Identification ____________
Dryer Front View
Illus. No. Description
1Tumbler Drive Motor Assembly
2Blower Motor Mount Assembly
3Blower Motor (impellor/fan) Assembly
4Idler Bearing Mount Assembly
5Tumbler Bearing Mount Assembly
6* Electric Service Relay Box
7Heating Unit
8Data Label and Installation Label
* Electric service connections are made in this box.
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 (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 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).
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.”
The dryer must not be installed or stored in an area where it
will be exposed to water and/or weather.
The dryer is for use in noncombustible locations.
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).
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 duct 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).

10 113257-4
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 unskid the dryer,
locate and remove the four lag bolts securing the base of the
dryer to the wooden skid. Two are located at the rear base
(remove the back panel for access) and two are located in
the bottom of the lint chamber. To remove the two lag bolts
located in the lint chamber area, remove the lint drawer and
the three Phillips head screws securing lint door in place.
Leveling Dryer
To level dryer, place 4-inch
(10.16 cm) square metal
shims (refer to the
illustration on the right) or
other suitable material under
the base pads. It is
suggested that the dryer be
tilted slightly to the rear.
If more headroom is needed
when moving dryer into
position, the top console
(module) may be removed.
Use the following
instructions to remove the
top console (module).
Disconnect the ground wire (A) at the rear upper left hand
corner of dryer.
Remove the eight sets of nuts and washers (B) holding the
console (module) to base.
Open the control door/control panel and disconnect the white
15-pin plug connector (C) (refer to the illustration below)
located in the base of the control box.
Disconnect white plug connector located outside back side
of the control box (provides power to heat circuit).
Lift the console (module) off the dryer base.
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:
Remove the exhaust transition
piece from the tumbler and
place it on the exhaust outlet.
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.
Dryer Enclosure Requirements ______
Even though a 12-inch (30.48 cm) clearance is acceptable,
it is recommended that the rear of the dryer be positioned
approximately 2 feet (0.60 meters) from the nearest
obstruction (i.e., wall) for ease of installation, maintenance,
and service. Bulkheads and partitions should be made from
noncombustible materials. The clearance between the
bulkhead header and the dryer must be a minimum of
4-inches (10.16 cm) and must not extend more than
4-inches (10.16 cm) to the rear of the dryer front. The
bulkhead facing must not be closed in all the way to the top
of the dryer. A 2-inch (5.08 cm) clearance is required.
NOTE: Bulkhead facing should not be installed until after
dryer is in place. Ceiling area must be located a minimum
of 12-inches (30.48 cm) above the top of the dryer. Even
though a minimum of only 12-inches (30.48 cm) is
required, 18-inches (45.72 cm) or more is suggested, for
steam dryers and especially in cases where sprinkler
heads are over the dryers.
When fire sprinkler systems are located above the dryers,
a minimum of 18-inches (45.72 cm) above the dryer
console (module) is suggested. Dryers may be positioned
sidewall to sidewall however, 1- or 2-inches (2.54 cm or
5.08 cm) is suggested between dryers (or wall) for ease of
installation and maintenance. Allowances must be made
for the opening and closing of the control and lint doors.
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

113257-4 11
IMPORTANT: Make-up air must be provided from a source
free of dry cleaning solvent fumes. Make-up air that is
contaminated by dry cleaning solvent fumes will result in
irreparable damage to the motors and other dryer
components.
NOTE: Component failure due to dry cleaning solvent
fumes will void the warranty.
Fresh Air Supply Requirements ______
This appliance may only be installed in a room that meets
the appropriate ventilation requirements specified in the
national installation regulations.
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.
Air supply (make-up air) must be given careful consideration
to ensure proper performance of each dryer. An unrestricted
source of air is necessary for each dryer. An airflow of 2,150
cfm (cubic feet per minute) (60.88 cmm [cubic meters per
minutes]) must be supplied to each dryer. As a general rule,
an unrestricted air entrance from the outdoors (atmosphere)
of a minimum of 3 square feet (0.28 square meters) is required
for each dryer.
To compensate for the use of registers or louvers used over
the openings, the area must be increased by approximately
thirty-three percent. Make-up air openings should not be
located in an area directly near where exhaust vents exit the
building.
It is not necessary to have a separate make-up air opening
for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner
that the make-up air is distributed equally to all the dryers.
The dryer must be installed with provisions for adequate
combustion and make-up air supply.
Exhaust Requirements _______________
General Exhaust Ductwork Information
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, overheating of the dryer, and
shutdown of the burner by the airflow (sail) switches, burner
hi-limits, or tumbler hi-heat thermostats. The dryer must be
installed with a proper exhaust duct connection to the outside.
The design of the flue system shall be such that any
condensate formed when operating the appliance from cold
shall either be retained and subsequently re-evaporated or
discharged.
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.
NOTE: This dryer is manufactured with a back draft damper.
EXAMPLE: For a bank of six gas dryers, two openings
measuring 3 feet by 3 feet (0.91 meters by 0.91 meters) are
acceptable.
Allowances must be made for remote or constricting
passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.

12 113257-4
The exhaust 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. Single or
independent dryer venting is recommended. When
single dryer venting is used, the ductwork from the dryer
to the outside exhaust outlet must not exceed 20 feet
(6.09 meters). In the case of multiple (common) dryer
venting, the distance from the last dryer to the outside
exhaust outlet must not exceed 20 feet (6.09 meters).
The shape of the ductwork is not critical as long as the
minimum cross section area is provided. It is suggested
that the use of 90° turns in ducting be avoided; use 30°
and/or 45° angles instead. The radius of the elbows
should preferably be 1-1/2 times the diameter of the duct.
Excluding tumbler dryer elbow connections or elbows
used for outside protection from the weather, no more
than two elbows should be used in the exhaust duct
run. If more than two elbows are used, the cross section
area of the ductwork must be increased in proportion to
number of elbows added.
IMPORTANT: It is recommended that exhaust booster
fans not be used in the exhaust ductwork system.
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 [0.5 mm]) thick.”
All ductwork should be smooth inside with no projections
from sheet metal screws or other obstructions, which
will collect lint. When adding ducts, the ducts to be added
should overlap the duct to which it is connected. All
ductwork joints must be taped to prevent moisture and
lint from escaping into the building. Additionally,
inspection doors should be installed at strategic points
in the exhaust ductwork for periodic inspection and
cleaning of lint from the ductwork.
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 (i.e., roof or ground
level).
IMPORTANT: Exhaust back pressure measured by a
manometer at the dryer exhaust duct area must be no
less than 0 and must not exceed 0.3 in WC (0.75 mb,
75 Pa).
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.
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
exhaust 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.
Single Dryer Venting
When possible, it is suggested to provide a separate exhaust
duct for each dryer. The exhaust duct should be laid out in such
a way that the ductwork travels as directly as possible to the
outdoors with as few turns as possible. It is suggested that the
use of 90° turns in ducting be avoided; use 30° and/or 45° angles
instead. The shape of the exhaust ductwork is not critical as long
as the minimum cross section area is provided.
IMPORTANT: Minimum duct size for a gas, electric, or steam
dryer with a vertical run and not more than three elbows
(including dryer connection and outside outlets) is 16-inches
(40.64 cm) for a round duct or 14-1/2” by 14-1/2” (36.83 cm by
36.83 cm) for a square duct. Duct size must not be reduced
anywhere downstream of dryer.
Exhaust back pressure measured by a manometer at each
tumbler exhaust duct area must be no less than 0 and must not
exceed 0.3 in WC (0.75 mb, 75 Pa).
It is suggested that the ductwork from each dryer (minimum
14-inches [35.56 cm]) not exceed 20 feet (6.09 meters) with no
more than three elbows (including dryer connections and outside
exhaust outlets). If the ductwork exceeds 20 feet (6.09 meters)
or has numerous elbows, the cross section area of the ductwork
must be increased in proportion to the length and number of
elbows in it. In calculating duct size, the cross section area of a
square or rectangular duct must be increased by twenty percent
for each additional 20 feet (6.09 meters). The diameter of a round
exhaust duct should be increased ten percent for each additional
15 feet (4.57 meters). Each 14-inch (35.56 cm) 90° elbow is
equivalent to 30 feet (9.14 meters) and each 16-inch (40.64 cm)
90° elbow is equivalent to 36 feet (10.97 meters).
IMPORTANT: Do not use screens, louvers, or caps on the
outside opening of the exhaust ductwork.

113257-4 13
IMPORTANT: For extended ductwork runs, the cross
section area of the duct can only be increased to an
extent. Maximum proportional ductwork runs cannot
exceed 20 feet (6.09 meters) more than the original
limitations of 20 feet (6.09 meters) with two elbows. When
the ductwork approaches the maximum limits as noted in
this manual, a professional HVAC firm should be consulted
for proper venting information.
All ductwork should be smooth inside with no projections from
sheet metal screws or other obstructions, which will collect
lint. When adding ducts, the duct to be added should overlap
the duct to which it is to be connected. All ductwork joints
must be taped to prevent moisture and lint from escaping
into the building. Inspection doors should be installed at
strategic points in the exhaust ductwork for periodic inspection
and cleaning of lint from the ductwork.
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.
Multiple Dryer (Common) Venting
If it is not feasible to provide separate exhaust ducts for each
dryer, ducts from individual dryers may be channeled into a
“common main duct.” The individual ducts should enter the
bottom or side of the main duct at an angle not more than
45° in the direction of airflow and should be spaced at least
48-3/4” (123.83 cm) apart. The main duct should be tapered,
with the diameter increasing before each individual dryer
branch duct is added.
IMPORTANT: No more than four dryers should be
connected to one main common duct.
The main duct may be any shape or cross-sectional area, as
long as the minimum cross section area is provided. The
illustration below shows the minimum cross section area for
multiple dryer round or square venting. These figures must
be increased 10 square inches (64.51 square centimeters)
when rectangular main ducting is used, and the ratio of duct
width to depth should not be greater than 3-1/2 to 1. These
figures must be increased in proportion if the main duct run
to the last dryer to where it exhausts to the outdoors is
unusually long (over 20 feet [6.09 meters]) or has numerous
elbows (more than two) in it. In calculating ductwork size,
the cross section area of a square or rectangular duct must
be increased twenty percent for each additional 20 feet (6.09
meters). The diameter of a round exhaust must be increased
ten percent for each additional 20 feet (6.09 meters). Each
90° elbow is equivalent to an additional 15 feet (4.57 meters).
IMPORTANT: Exhaust back pressure measured by a
manometer at each dryer exhaust duct area must be no
less than 0 and must not exceed 0.3 in WC (0.75 mb, 75
Pa).
For extended ductwork runs, the cross section area of the
ductwork can only be increased to an extent. Maximum
proportional ductwork runs cannot exceed 20 feet (6.09
meters) more than the original limitations of 20 feet (6.09
meters) with two elbows. When the ductwork approaches
the maximum limits as noted in this manual, a professional
HVAC firm should be consulted for proper venting
information.
The duct should be smooth inside with no projections from
sheet metal screws or other obstructions, which will collect
lint. When adding ducts, the duct to be added should overlap
the duct to which it is to be connected. All ductwork joints
must be taped to prevent moisture and lint from escaping
into the building. Inspection doors should be installed at
strategic points in the exhaust ductwork for periodic inspection
and cleaning of lint from the ductwork.
MULTIPLE DRYER VENTING
14-INCHES (35.56 CM) DIAMETER, 2,150 CFM (60.88 CMM) EXHAUST CONNECTION AT COMMON DUCT
(GAS, ELECTRIC, AND STEAM MODELS)

14 113257-4
!WARNING
208 VAC and 230/240 VAC are not the same. Any
damage done to dryer components due to improper
voltage connections will automatically void the
warranty.
NOTE: The manufacturer reserves the right to make
changes in specifications at any time without notice or
obligation.
Electrical Service Specifications
* 3-Wire is available. 8/12/14
* 3-Wire is available. 8/12/14
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.
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 exhaust 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 nearest obstruction.
IMPORTANT: Do not use screens, louvers, or caps on the
outside opening of the exhaust ductwork.
Electrical Information ________________
Electrical Requirements
It is your responsibility to have all electrical connections made
by a properly licensed and competent electrician 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 could 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.
Wiring diagrams are affixed to the left side panel area
behind the top control (access) door.
IMPORTANT: The dryer must be connected to the electric
supply shown on the data label. In the case of 208 VAC or
230/240 VAC, the supply voltage must match the electric
service specifications of the data label exactly.
Gas and Steam – Reversing
ELECTRICAL SERVICE SPECIFICATIONS (PER DRYER)
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. alculate/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
208 3ø 3 15 — 20
220 3ø 3 14 — 20
230 / 240 3ø 3 — 18 25
240 3ø 3 15 — 20
380 / 400 3ø 3 9 — 15
380 3ø 4*—9 15
400 3ø 4*—9 15
416 3ø 4*—10 15
440 3ø 3 9 9 15
460 3ø 3 8 — 15
480 3ø 3 8 — 15
575 3ø 3 7 — 15
Electric – Reversing
ELECTRICAL SERVICE SPECIFICATIONS (PER DRYER)
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
APPROX.
AMP DRAW CIRCUIT
BREAKER
60 Hz 50 Hz
60.5 kW
220 3ø 3 173 —225
380 3ø 3 101 —150
380 3ø 4*—101 150
66 kW
460 3ø 3 91 —125
230 3ø 3 —184 250
400 3ø 4*—104 150
72 kW
208 3ø 3 215 —300
240 3ø 3 188 —250
480 3ø 3 95 —125
575 3ø 3 79 —100
416 3ø 4*—109 150
75.6 kW
220 3ø 3 214 —300
440 3ø 3 108 —150
78.6 kW
600 3ø 3 81 —1.25

113257-4 15
Electrical Connections
NOTE: A wiring diagram is included with each dryer and is
affixed to the rear upper right guard/panel of the dryer.
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.
NOTE: A grounding connection (terminal lug) is provided in
the dryer’s electrical service/relay box at the rear.
For added personal safety, when possible, it is suggested
that a separate ground wire (sized per local codes) be
connected from the ground connection of the dryer to a
grounded cold water pipe. Do not ground to a gas or hot
water pipe. The grounded cold water pipe must have metal
to metal connections all the way to electrical ground. If there
are any nonmetallic interruptions, such as a meter, pump,
plastic, rubber, or other insulating connectors, they must be
jumped out with no. 4 copper wire and securely clamped to
bare metal at both ends.
IMPORTANT: For personal safety and proper operation,
the dryer must be grounded. For proper operation of the
microprocessor controller (computer), an earth (zero)
ground is required.
NOTE: Grounding via metallic electrical conduit (pipe) is
not recommended.
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 (L.P. Gas) or LATEST
EDITION.
In Australia, the fuel gas code is AS/NZS5601, 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.
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.
Fire or explosion could result.
!WARNING
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 UL 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) enters the dryer
electrical service (relay) box.
Gas Model and Steam Model Dryers
These electrical connections are made at the terminal block
located in the electric service/relay box at the rear, upper left
hand corner of the dryer. To gain access into this service
box, the service cover (upper back guard) must be removed.
Electric Model Dryers
For electric model dryers made to operate at 208 VAC or
230/240 VAC, the electrical input connection is made into
the terminal block located at the upper rear of the dryer (refer
to the illustration below). For electric model dryers made to
operate at 380 VAC, 416 VAC, 440 VAC, or 480 VAC, the
electrical input connection is made to the oven relay located
at the upper rear of the dryer (refer to the illustration below).
Input connection wiring must be sized properly to handle the
dryer’s current draw. This information is printed on the dryer’s
data label.
NOTE: A circuit servicing each dryer must be provided.

16 113257-4
Technical Gas Data
Gas Specifications
Shaded areas are stated in metric equivalents
Abbreviations: AU (Australia) and NZ (New Zealand).
* Manifold pressure is measured at the pressure tap on the outlet side of the gas valve when the valve is on.
** Unregulated L.P. kit installed. Gas valve’s internal regulator (governor) is disabled.
*** Regulated L.P. installed. Gas valve’s internal regulator (governor) is adjustable.
Rating
375,000 BTU/hr
94,500 kCal/hr
395.6 MJ/hr
Manifold Pressure*In-Line Pressure Orifice
Inches W.C. mbar kPa Inches W.C. mbar kPa Qty. DMS mm
Gas
Type
Natural Gas 3.5 8.7 0.87 7.0-13.0 17.4-32.4 1.74-3.24 3#4
5.309
Natural Gas (AU / NZ)
L.P. Gas** 10.5 26.2 2.62 11.0 27.4 2.74 3#30
3.264
L.P. Gas (AU / NZ)*** 8.8 22.0 2.20
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 reseller who sold the dryer or contact the
manufacturer.
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
reseller who sold the dryer or contact the manufacturer.
IMPORTANT: This gas dryer is not provided with an
internal gas supply shutoff and an external gas supply
shutoff must be provided.
NOTES __________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________________________

113257-4 17
Gas Connections
Inlet connection ........... 1” N.P.T.
(1” B.S.P.T. for CE and AGA dryers)
Gas Pipe supply size ... 1-1/4” Diameter Pipe (minimum)
Heat input .................... 375,000 Btu/hr (94,500 kcal/hr)
Natural Gas
Regulation is controlled by the dryer’s gas valve’s internal
regulator. Incoming supply pressure must be consistent
between a minimum of 7.0 in WC (17.4 mb, 1.74 kPa) and a
maximum of 13.0 in WC (32.4 mb, 3.24 kPa) pressure. Burner
manifold pressure should be 3.5 in WC (8.7 mbar, 0.87 kPa);
adjust if necessary.
L.P. Gas (Unregulated)
Dryers made for use with unregulated 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 in WC (26.1 mb, 2.61 kPa). 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.
L.P. Gas (Regulated)
Regulation is controlled by the dryer’s gas valve’s internal
regulator. Incoming supply pressure must be consistent at
11.0 in WC (27 mbar, 2.7 kPa). Burner manifold pressure
should be 8.8 in WC (22 mbar, 2.2 kPa); adjust if necessary.
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 (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. (1” B.S.P.T. for CE and
AGA dryers) inlet pipe connection extending out the back
area of the burner box. The minimum pipe size connection
(supply line) to the dryer is 1-1/4” 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 13.0 in
WC (32.4 mb, 3.24 kPa) pressure.
IMPORTANT: A water column pressure of 3.5 in WC (8.7
mb, 0.87 kPa) for natural gas and 10.5 in WC (26.1 mb,
2.61 kPa) for unregulated L.P. dryers, and 8.8 in WC (22
mb, 2.2 kPa) for regulated L.P. dryers is required at the gas
valve pressure tap of each dryer for proper and safe
operation.
An 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.
Test all connections for leaks by brushing on a soapy
water solution (liquid detergent works well).
Never test for leaks with a flame!!!
!WARNING
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).

18 113257-4
Steam Information ___________________
It is your responsibility to have all steam plumbing connections
made by a qualified professional to ensure 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: In standard format this dryer is manufactured with a
pneumatic (piston) damper system, which requires an
external supply of air (80 psi +/- 10 psi [5.51 bar +/- 0.68
bar]). This dryer may be provided with an optional steam
solenoid valve, in which case, no pneumatic steam damper
system is provided.
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.
Steam Requirements, High Pressure
STANDARD 2-STAGE STEAM COIL
Inlet – 1-1/4” N.P.T. supply line connections – qty. two at first
(top) and third manifold.
Return – 1” N.P.T. return line connections – qty. two at second
and fourth (bottom) manifold.
Shaded areas are stated in metric equivalents
* The minimum operating pressure for optimum results is 100 psig (689.47 kPa).
** 174 psig (1,200 kPa [12 bar]) with optional one-stage steel steam coil only.
Installation Instructions
To ensure that 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 and steam return lines or improper steam
plumbing will result in poor performance and can cause
component failure. Clean, dry, and regulated steam must be
provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by
wet steam will void the warranty.
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 within a minimum 12-inch (30.48
cm) riser. This will prevent any condensate from draining
towards the dryer.
Figure 1: Piping Diagram for Standard 2-Stage Steam Coil
OPTIONAL 1-STAGE STEEL STEAM COIL
Inlet – 1-1/4” N.P.T. Supply Line Connection – qty. one (1) at
top manifold.
Return – 1-1/4” N.P.T. Return Line Connection – qty. one (1)
at bottom manifold.
OPERATING STEAM PRESSURE
Maximum*Heat Input
(Normal Load)
Consumption (Approx.)
@ Maximum Pressure
125 psig 862 kPa 13
Bhp 450 lb/hr 204.12 kg/hr
174 psig** 1,200 kPa** 14.5
Bhp** 515 lb/hr** 234 kg/hr**

113257-4 19
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.
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.
Shutoff valves for each dryer should be installed in the supply,
return, and drip trap return lines. This will allow the dryer to
be isolated from the supply and return mains if the dryer needs
maintenance work.
Install an inverted bucket steam trap and check valve at least
12-inches (30.48 cm) below each steam coil return manifold
as close to the coil as possible.
Two traps, each with a capacity of 600 lb (272 kg) of
condensate per hour at 125 psi (8.62 bar), are needed for
each unit.
NOTE: With optional one-stage steel steam coil, one
inverted bucket steam trap with a capacity of 1,200 (544
kg) of condensate per hour at operating pressure is
required for each dryer. Refer to figure 2 above.
A 3/4-inch (19.05 mm) vacuum breaker should be installed
for each unit in the piping. This will prevent the condensing
steam from causing a vacuum inside the coil and possibly
damaging the coil.
Dryers with optional steam solenoid valve: valve must be
mounted with coil positioned directly above the valve body.
Figure 2: Piping Diagram for Option One-Stage Steel Steam Coil
The supply and return lines should be insulated. This will
save energy and provide safety for the operator and
maintenance personnel.
Water pockets in the supply lines, caused by low points, will
provide wet steam to the coil possibly causing coil damage.
All horizontal runs of steam supply piping should be pitched
1/4-inch (6.35 mm) for every 1 foot (0.31 meters) back towards
the steam supply header causing any condensate in the line
to drain to the header. Install a bypass trap in any low point
to eliminate wet steam.
IMPORTANT: Flexible hoses/couplings must be used. Coil
failure due to hard plumbing connections will void the
warranty.
Steam Damper Air System Connections
In standard format, this dryer is manufactured with a
pneumatic (piston) damper system, which requires an
external supply of compressed air of 4.25 cfh (0.12 cmh)
(refer to page 24 for further compressed air requirements).
(Note: This dryer may be provided with an optional steam
solenoid valve in which case, no steam damper system is
provided.) The air connection is made to the steam damper
solenoid valve, which is located at the rear inner top area of
the dryer just above the electric service relay box (refer to
the bottom illustration on the following page).

20 113257-4
Steam Damper Air Piston (Flow Control)
Operation Adjustment System
Although the damper operation was tested and adjusted prior
to shipping at 80 psi (5.51 bar, 551 kPa), steam damper
operation must be checked before the dryer is put into
operation. If damper air adjustment is necessary, locate flow
control valve and make necessary adjustments as noted
below.
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Steam Damper System Operation
The steam damper, as shown in the illustration below, allows
the coil to stay constantly charged eliminating repeated
expansion and contraction. When the damper is opened,
the air immediately passes through the already hot coil,
providing instant heat to start the drying process. When the
damper is closed, ambient air is drawn directly into the
tumbler, allowing a rapid cool down.
Diagram 1 – shows the damper in the heating (open) mode,
allowing heat into the tumbler.
Diagram 2 – shows the damper in the cool down (closed)
mode, pulling ambient air directly into the tumbler without
passing through the coils.
NOTE: With the dryer off or with no air supply, the damper
is in the cool down mode as shown in Diagram 2.