Dexter Laundry B-Series User manual

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INDUSTRIAL DRYER
MODEL T-50 REVERSING ON-PREMISE
B-SERIES CONTROL, NATURAL GAS/LP HEATED
OPERATOR’S MANUAL
INSTALLATION & OPERATION INSTRUCTIONS
The dr er must not be stored or installed where it will be exposed to water and/or weather.
Post the following “For our Safety” caution in a
prominent location:
It is important that you read this Manual and retain it
for future reference. For service or replacement parts,
contact the distributor in your area or the manufacturer.
Dexter Laundr , Inc.
2211 West Grimes Avenue
Fairfield, Iowa 52556
AVERTISSEMENT. Assurez
-
vouz
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 matérial,
toute blessure
ou la mort.
-Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
– WHAT TO DO IF OU 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.
WARNING: For our safet the infor
-
mation in this manual must be fol-
lowed to minimize the risk of fire or
explosion or to prevent propert dam-
age, personal injur or loss of life.
Ne pas entreposer ni utiliser d’essence ni d’autres
vapeurs ou liquides inflammables dans le
voisinage de cet appareil ou de tout autre
appareil.
– QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareil.
• Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant
dans le bâtiment où vous trouvez.
• Évacuez la pièce, le bâtiment ou la zone.
• Appelez immédiatement votre fournisseur
de gaz depuis un voisin. Suivez les
instructions du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur
de gaz, appelez le service des incendies.
– L’installation et l’entretien doivent être assures
par un installateur ou un service d’entretien
qualifie ou par le fournisseur de gaz.
POUR VOTRE SÉCURITÉ
Ne pas ente poser ni utiliser d’essence ni d’autres
vapeurs ou liquides inflammables dans le voisinage
de cet appareil ou de tout autre appareil.
ou, the purchaser, must post in a prominent loca-
tion instructions to be followed in the event the user
smells gas. Consult your local gas supplier for pro-
cedure to be followed if the odor of gas is present.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapors or liquids in the vicinity of this or any
other appliance.

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TABLE OF CONTENTS
Page No.
Warnings about use and operation 2
Dryer Specifications 3
Dryer Dimensions 4-6
Uncrating 7
Dryer Exhaust 9
Dryer Shutdown 11
Dryer Controller Interface 12
Dryer Controller Factory Default Program Setting 13
Dryer Fault Codes 13
Touch Pad Description 14
Operating Instructions 16
Temporary Dryer Controller Programming 17
Permanent Dryer Controller Programming 20
Servicing and Troubleshooting 23
Preventative Maintenance Instructions 24
WARNINGS ABOUT USE AND OPERATION
It is ABSOLUTELY ESSENTIAL that the dryer be grounded to a known earth (zero) ground. This is not only
for personal safety, but is necessary for proper operation.
DO NOT MODIFY THIS APPLIANCE. KEEP SHIELDS, GUARDS, AND COVERS IN PLACE. These
safety devices are provided to protect everyone from injury.
THIS DRYER IS EQUIPPED WITH AN OVER-TEMPERATURE THERMOSTAT located to the right of the
motor on the rear of the cabinet. If the dryer cease to operate, refer to your “Service Procedure and Parts Data”
book for instructions.
CHECK THIS THERMOSTAT WHEN INSTALLING THE DRYER to assure it is not tripped. Impacts such as
rough handling in shipment, may trip the thermostat.
DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE while in operation.
THIS APPLIANCE SHALL NOT BE USED TO DRY OFF CLOTHES CONTAINING SOLVENTS OR DRY
CLEANING FLUIDS.

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50 lb. Industrial Dr er: T-50
DN0050N_-11_B_R (60 Hz)
Cabinet Height 72 1/4” 1835 mm.
(Assumes minimum leveling leg adjustment)
Cabinet Width 34 1/2” 875 mm.
Overall Depth 52” 1321 mm.
Floor to Bottom of Door 27 1/4” 692 mm.
Door Opening 25 5/8” 653 mm.
Dry Wt. Capacity 50 lbs. 24.9 kg.
Cylinder Diameter 32.5” 826 mm.
Cylinder Depth 33” 845 mm.
Cylinder Volume 15.84 cu. ft. 449.5 liters
Lint Screen Area 708 sq. in. 4568 sq. cm.
Gas Input (60 hz) 145,000 Btu/hr 42.5 kW
Gas Supply Connection 1/2” 12.7 mm.
Natural Gas Supply (Water Column) 5-10” 127 mm. - 254 mm.
Natural Burner Manifold
(60 hz Water Column) 3.5” 88.9 mm
L.P. Supply (Water Column) 11.5- 14” 292 mm- 356 mm
L.P. Burner Manifold Pressure
(60 hz Water Column) 11” 279 mm
Exhaust Size 8” 203 mm.
Make-up Air 1.25 sq. ft. 1161 sq. cm.
Example: 1.25 sq. ft = 1.25 ft. long X 1 ft. wide
Motor Size (60 Hz) 2 H.P. 1.5 kW
Airflow (60 hz) 910 CFM 25.8 m^3/min
Electrical Specifications – 208-240/60/1
Voltage/Hz/Phase 208-240V/60Hz/1Phase
Running Amps 5.1
Circuit Protection Amps 10
Wire Size 14 gauge
Electrical Service 2 wire + ground
Shipping Weight 611 lbs. 277 kg.
Net Weight 579 lbs. 263 kg.
Clearance Behind Machines (min.) 18” 457 mm.

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DRYER DIMENSIONS- FIGURE 1A

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DRYER DIMENSIONS- FIGURE 1B

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DRYER DIMENSIONS- FIGURE 1C

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INSTALLATION AND OPERATING INSTRUCTIONS
INDUSTRIAL DRYER
UNCRATING
Tools required: 3/4” hex socket and ratchet driver, knife, channel-lock wrench that opens to 1 3/8".
1. Remove the plastic wrap with knife. Remove cardboard rails, fillers and top cap.
2. Using a ratchet and a 3/4” socket, remove the (4) bolts attaching the wooden skid to the dryer cabinet. Save
the bolts for future moving of the dryer.
3. With a walking motion, move the dryer forward completely off the wooden skid. Save the skid for future
moving of the dryer.
4. Using the channel-lock wrench, adjust the leveling legs to align the machine with adjacent units.
Note: If the dryer is ever moved again, the dryer should be re-mounted on its pallet and its crating bolts re-
inserted and tightened, in the reverse order as above.
DRYER INSTALLATION
1. CODE CONFORMITY. All commercial dryer installations must conform with local codes or, in the absence of
local codes, with the latest edition of the National Fuel Gas Code ANSI Z223.1A. Canadian installations must
comply with current Standard CAN/CGA-B149 (.1 or .2) Installation Code for Gas Burning Appliances or Equipment,
and local codes if applicable. Australian installations must meet installation requirements and pipe sizing
requirements of AS/NZA 5601. The appliance, when installed, must be electrically grounded in accordance with
the latest edition of the National Electrical Code, ANSI/NFPA70, or, when installed in Canada, with Standard CSA
C22.1 Canadian Electrical Code Part 1.
2. INSTALLATION CLEARANCES. This unit may be installed at the following alcove clearance. (millimeters)
I. Left Side 0”
II. Right Side 0” *
III. Back 18” (457) (Certified for 1” (25) clearance; however, 18” (457) clearance is necessary behind
the belt guard to allow servicing and maintenance.)
IV. Front 48” (1220) (to allow use of dryer)
V. Top Refer to figure on the next page labeled “Vertical Clearance Dimensions”.
Certification allows 0” clearance at the top 1” (25) back from the front. However, a 1/4” (6)
clearance is required to allow opening the upper service door.
A 10” (254) clearance is required fro the top at all other points.
VI. Floor This unit may be installed upon a combustible floor.
*Units may be installed in direct contact with an adjacent dryer, providing allowance is made for opening
upper and lower service doors.
Do not obstruct the flow of combustion and ventilation air.
Maintain minimum of 1” (25) clearance between duct and combustible material.
Refer to installation label attached to the rear guard of the dryer for other installation information.

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VERTICAL CLEARANCE DIMENSIONS
3. MAKE-UP AIR. Adequate make-up air must be supplied to replace air exhausted by dryers on all types of
installations. Refer to specifications for the minimum amount of make-up air opening to outside for each dryer. This is a
net requirement of effective area. Screens, grills or louvers, which will restrict the flow of air, must be considered.
Consult the supplier to determine the free area equivalent for the grill being used. The source of make-up air should be
located sufficiently away from the dryers to allow an even airflow to the air intakes of all dryers. Multiple openings
should be provided.
The sources of all make-up air and room ventilation air movement to all dryers must be located away from any
dry cleaners. This is necessary so that solvent vapors will not be drawn into the dryer inlet ducts. Dry cleaner
solvent vapors will decompose in contact with open flame such as the gas flame present in clothes dryers. The
decomposition products are highly corrosive and will cause damage to the dryer(s) ducts and clothes loads.
4. ELECTRICAL REQUIREMENTS. The electrical power requirements necessary to operate the unit satisfactorily are
listed on the serial plate located on the back panel of each dryer and in the specifications section of this manual.
The electrical connection should be made to the terminal board, on the rear of the unit. It is absolutely necessary
that the dryer be grounded to a known ground. Individual circuit breakers for each dryer are required.
Individual circuit breakers for each unit are recommended. Do not use ground-fault circuit breakers or ground-
fault circuit interrupter outlets. The wiring diagram is located on the belt guard on the back of the machine.
IMPORTANT: TRANSIENT VOLTAGE SURGE SUPPRESSORS
Like most electrical equipment, your new machine can be damaged or have its life shortened by voltage surges
due to lightening strikes which are not covered by factory warranty. Local power distribution problems also can
be detrimental to the life of electrical components. We recommend the installation of transient voltage surge
suppressors for your new equipment. These devices may be placed at the power supply panel for the complete
installation and don’t require an individual device for each machine.
These surge protectors help to protect equipment from large spikes and also from small ongoing spikes in the
power that occur on a day to day basis. These smaller surges can shorten overall life of electrical components of
all types and cause their failure at a later date. Although they can’t protect against all events, these protective
devices have a good reputation for significantly lengthening the useful life of electronic components. Electronic

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components are helped to have a longer useful life when they are supplied with the clean stable electrical power
they like.
We are including the following names and phone numbers of a few suppliers of these devices for those who don’t
currently have a source.
MANUFACTURER CONTACT PHONE
Innovative Technology, Inc (Eaton) Factory 1-800-647-8877 or www.itvss.com
EFI Electronics Corporation Factory 1-800-877-1174 or www.efinet.com
(Schneider Electric) Distributor – Surge Pro 1-877-233-0153
MCG Surge Protection Factory 1-800-851-1508 or www.mcgsurge.com
Advanced Protection Technologies Inc. Factory 1-800-237-4567 or www.aptsurge.com
5. GAS REQUIREMENTS. The complete gas requirements necessary to operate the dryer satisfactorily are listed
on the serial plate located on the back panel of the dryer.
The inlet gas connection to the unit is 1/2 inch pipe thread.
An individual gas shutoff valve is recommended for each dryer and may be required by local code (not
supplied).
A joint compound resistant to the action of liquefied petroleum gases should be employed in making pipe
connections.
A 1/8 inch NPT plugged tapping, accessible for test gage connection, must be installed immediately upstream
of the gas supply connection to the dryer.
A drip tee should be provided in the gas piping entering the unit to catch dirt and other foreign articles.
All pipe connections should be checked for leakage with soap solution. Never check with an open flame.
For altitudes above 2,000 feet (610m) it is necessary to de-rate the BTU input. Contact your local distributor
for instructions.
L.P. gas conversion kits are available for this dryer. Contact your local distributor.
CAUTION: The dryer must be disconnected from the gas supply piping system during any pressure testing of
that system. Do not expose the dryer’s gas control valve to testing pressure.
6. EXHAUST INSTALLATION. Exhausting of the dryer(s) should be planned and constructed so that no air
restrictions occur. Any restriction due to pipe size or type of installation can cause slow drying time, excessive
heat, and lint in the room.
From an operational standpoint, incorrect or inadequate exhausting can cause a cycling of the high limit thermostat
which shuts off the main burners and results in inefficient drying.
Individual exhausting of the dryers is recommended. All heat, moisture, and lint should be exhausted outside
by attaching a pipe of the proper diameter to the dryer adapter collar and extending it out through an outside wall.
This pipe must be very smooth on the inside, as rough surfaces tend to collect lint which will eventually clog the
duct and prevent the dryer from exhausting properly. All elbows must be smooth on the inside. All joints must be
made so the exhaust end of one pipe is inside the next one downstream. The addition of an exhaust pipe
tends to reduce the amount of air the blower can exhaust. This does not affect the dryer operation if held within
practical limits. For the most efficient operation, it is recommended that no more than 14 ft. (4.25 m) of straight
8 in. diameter pipe with two right angle elbows be used for each cylinder.
Maintain minimum 1” (25) clearance between duct and combustible material.
If the exhaust pipe passes through a wall, a metal sleeve of slightly larger diameter should be set in the wall and
the exhaust pipe passed through this sleeve. This practice is required by some local codes and is recommended in
all cases to protect the wall. This type of installation should have a means provided to prevent rain and high winds
from entering the exhaust when the dryer is not in use. A hood with a hinged damper can be used for this purpose.

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Another method would be to point the outlet end of the pipe downward to prevent entrance of wind and rain. In
either case, the outlet should be kept clear, by at least 24” (610), of any objects which would cause an air
restriction.
Never install a protective screen over the exhaust outlet.
When exhausting a dryer straight up through a roof, the overall length of the duct has the same limits as exhausting
through a wall. A rain cap must be placed on top of the exhaust and must be of such a type as to be free from
clogging. The type using a cone shaped “roof” over the pipe is suitable for this application.
Exhausting the dryer into a chimney or under a building is not permitted. In either case there is a danger of
lint build-up which can be highly combustible.
Installation of several dryers, where a main discharge duct is necessary, will need the following considerations for
installation. Individual ducts from the dryers into the main discharge duct should be at a 45 degree angle in the
direction of discharge air flow.
NOTE: Never install the individual ducts at a right angle into the main discharge duct. The individual
ducts from the dryers can enter at the sides or bottom of the main discharge duct. The main duct can be
rectangular or round, provided adequate air flow is maintained. For each individual dryer, the total exhausting
(main discharge duct plus duct outlet from the dryer) should not exceed the equivalent of 20 feet (6m) and
two elbows. The diameter of the main discharge duct at the last dryer must be maintained to exhaust end.
NOTE: A small diameter duct will restrict air flow; a large diameter duct will reduce air velocity – both
contributing to lint build up. An inspection door should be provided for periodic clean-out of the main
duct.
NOTE: STATIC BACK PRESSURE should be a maximum of 0.3 at the rear exhaust outlet of the dryer. If
multiple dryers are connected to the common duct, ensure the back draft damper is installed properly.
7. DRYER IGNITION (SOLID STATE IGNITION). The solid state ignition system lights the main burner gas
by spark. The gas is ignited and burns only when the gas-valve relay (in the electronic controller) calls for heat.
The procedure for first-time starting of a dryer is as follows:
A. First, review and comply with the “WARNINGS ABOUT USE AND OPERATION” found on the inside front
cover of this manual. Be sure the electrical power supply is connected correctly. The white (neutral) wire is to
be connected to the N terminal while the black (line) wire to the L1 terminal of the terminal block in the rear
control box. The dryer MUST be properly grounded.
B. Make sure all gas supply lines are purged of air. Close the main gas shut-off valve and wait for five minutes
before turning the valve back on.