Dexter Laundry DDBD T-50-2 Series Building instructions

8533-068-001 9/21Starting serial number 213052
DDBD T-50X2 Models
50 Pound Stacked Commercial Dryer
Service and Parts Manual
DDBD 50KC_ - 65, DDBD 50KC_ - 59, DDBD 50KC_ - 39

Indicates an imminently hazardous situation, which if
not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation, which if not
avoided could result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It may
also be used to alert against unsafe practices. Minor
burns, pinch points that result in bruises and minor
chemical irritation.
Indicates information or a company policy that relates
directly or indirectly to the safety of personnel or protec-
tion of property.
This is the user caution symbol. It indicates a condition
where damage to the equipment resulting in injury to
the operator could occur if operational procedures are
not followed. TO REDUCE THE RISK OF DAMAGE OR
INJURY, refer to accompanying documents; follow all
steps or procedures as instructed.
This is the electrical hazard symbol. It indicates that
there are DANGEROUS HIGH VOLTAGES PRESENT inside
the enclosure of this product. TO REDUCE THE RISK OF
FIRE OR ELECTRIC SHOCK, do not attempt to open the
enclosure or gain access to areas where you are not
instructed to do so. REFER SERVICING TO QUALIFIED
SERVICE PERSONEL ONLY
Caution! There are sharp edges on various sheet metal
parts internal to the enclosure. Use safety consciousness
when placing or moving your hands while working in the
interior of this equipment.
Caution! To reduce the risk of damage to the Water Inlet
Valve, do not supply inlet water with a temperature that
exceeds 70˚ C.
Caution! To reduce the risk of re or explosion, do not
operate this equipment in any hazardous classied
(ATEX) environment.
Equipment Safety Warnings
Symbols and Terminology Used in this Equipment
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Part # 8533-068-001 9/21

Warning! Do not operate equipment if door glass is
damaged in any way.
Warning! Keep clear of rotating parts.
Prohibited! Do not enter this equipment or space.
Prohibited! Do not step or stand on this equipment.
Prohibited! Do not operate without all guards and covers in
place.
Prohibited! Do not operate without all guards and covers in
place.
Prohibited! Do not wash or Dry clothing impregnated with
ammable liquids (petrochemical).
Prohibited! Do not allow children to play in or around
equipment.
Equipment Safety Warnings
Symbols and Terminology Used in this Equipment
4Part # 8533-068-001 9/21

Indicates an imminently hazardous situation,
which if not avoided, will result in death or seri-
ous injury.
Indicates a potentially hazardous situation,
which if not avoided could result in death or
serious injury.
Indicates a potentially hazardous situation
which, if not avoided, may result in minor or
moderate injury. It may also be used to alert
against unsafe practices. Minor burns, pinch
points that result in bruises and minor chemical
irritation.
Indicates information or a company policy that
relates directly or indirectly to the safety of per-
sonnel or protection of property.
This is the user caution symbol. It indicates a
condition where damage to the equipment re-
sulting in injury to the operator could occur if
operational procedures are not followed.
TO REDUCE THE RISK OF DAMAGE OR INJURY,
refer to accompanying documents; follow all
steps or procedures as instructed.
This is the electrical hazard symbol. It indicates
that there are DANGEROUS HIGH VOLTAGES
PRESENT inside the enclosure of this product.
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, do not attempt to open the enclosure or
gain access to areas where you are not instruct-
ed to do so. REFER SERVICING TO QUALIFIED
SERVICE PERSONEL ONLY
Caution! To reduce the risk of re or explosion,
do not operate this equipment in any hazardous
classied (ATEX) environment.
5
Part # 8533-068-001 9/21

• All Dryers must be installed in accordance to
all applicable electrical, plumbing and all other local
codes.
• These installation and operation instructions are
for use by qualied personnel only. To avoid injury
and electrical shock, do not perform any servicing
other than that contained in the installation and op-
eration instructions, unless qualied.
Do not install Equipment in an explosive atmosphere.
•Care must be stressed with all foundation work to
ensure a stable unit installation, eliminating pos-
sibilities of excessive vibration.
•Foundation must be level within 13 mm to ensure
proper washer operation.
Do not operate washer or Dryer if door glass is dam-
aged in any way.
Do not wash or Dry clothing impregnated with am-
mable liquids (petrochemical).
WARNING
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Children should be supervised to
ensure they do not operate or play
in or around equipment.
Keep all panels in place to protect against electrical
shock and injury and add rigidity to washer.
WARNING
This appliance is not intended for use by persons (including
children) with reduced physical, sensory or mental capabilities, or
lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a
person responsible for their safety.
A washer should not be allowed to operate if any of the following occur:
• Excessive high water level.
• Machine is not connected to a properly earthed circuit.
• Door does not remain securely locked during the entire cycle.
• Vibration or shaking from an inadequate mounting or foundation
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Part # 8533-068-001 9/21

Warning! Do not operate equipment if door glass is
damaged in any way.
Warning! Keep clear of rotating parts.
Prohibited! Do not enter this equipment or space.
Prohibited! Do not step or stand on this equip-
ment.
Prohibited! Do not operate without all guards and
covers in place.
Prohibited! Do not operate without all guards and
covers in place.
Prohibited! Do not wash or Dry clothing impreg-
nated with ammable liquids (petrochemical).
Prohibited! Do not allow children to play in or
around equipment.
8Part # 8533-068-001 9/21

Warning! Do not operate equipment if door glass is
damaged in any way.
Warning! Keep clear of rotating parts.
Prohibited! Do not enter this equipment or space.
Prohibited! Do not step or stand on this equip-
ment.
Prohibited! Do not operate without all guards and
covers in place.
Prohibited! Do not operate without all guards and
covers in place.
Prohibited! Do not wash or Dry clothing impreg-
nated with ammable liquids (petrochemical).
Prohibited! Do not allow children to play in or
around equipment.
Prohibited! Do not attempt to open, touch, or pro-
ceed before referring to the manual or unless quali-
ed.
Mandatory! Read all supporting documentation be-
fore operating or maintaining equipment.
Mandatory! Disconnect power before servicing
equipment.
Mandatory! Lock out and tag out before servicing
this equipment.
Mandatory! Children should be supervised to ensure
they do not operate equipment.
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Part # 8533-068-001 9/21

10 Part # 8533-068-001 9/21
Notes

Dry only fabrics washed in water
to avoid the risk of fire, including
spontaneous combustions, do not dry:
• Items containing foam rubber, or any
similarly textured rubber-like materials.
• Any items on which you have used a
cleaning solvent or which contain amm.
able liquids or solids, such as naptha,
gasoline, or other oils or waxes.
Table of Contents
Section 1:
Specications................................................ 6
Section 2:
Installation and Operation
Installation Clearances................................... 8
Make Up Air .................................................. 8
Electrical Requirements ................................. 9
Gas Requirements ......................................... 9
Burner Set Up ............................................... 9
Exhaust Installation...................................9-11
Installation Dimensions................................ 12
Description of Control.................................. 13
Operating Instructions................................. 13
Characteristics of a Running Dryer................ 13
Programm.ed Data .......................................14
Dexter Control Features Activation Procedure 15
Entering Program Mode ............................... 16
Programm.ing ............................................. 16
Exiting Program Mode ................................. 16
Programm.ing Example................................ 16
Section 3:
Wiring Schematics
Dryer Idle- No Coins Added.......................... 18
Coins Added-Motor Starting and Running ...... 18
Heat Circuit................................................. 18
Over Temperature Thermostat ..................... 19
Cool Down.................................................. 19
End of Cycle ............................................... 19
Wiring Diagram for DDAD Dryer ................... 20
Wiring Schematic for DDAD Dryer ................ 21
Dexter Safety Guidelines
WARNING
For your safety, the information in this manual
must be followed to minimize the risk of re
or explosion or to prevent property damage,
personal injury or loss of life.
IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch: do not use any
telephone in your building.
• Clear the room, building or area of all occupants.
• Imm.ediately call your gas supplier from a
neighbor’s telephone.
• Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the
re department. Installation and service must be
performed by a qualied installer, service agency or
the gas supplier.
To activate your warranty, be sure to return
your red warranty form to the factory. Please
have serial number and model ready when
calling for assistance.
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Section 4:
Service Procedures
Clothes Door Removal ................................. 24
Clothes Door Latch Adjustment .................... 24
Door Switch Removal and Installation ........... 24
Installation of Clothes Door Window and Gasket . 24
High Limit Thermostat Locations and Functions .. 24
Pressure Regulator Adjustment .................... 25
Coin Acceptor Removal................................ 25
Coin Switch Adjustment............................... 25
Heat Sensor................................................ 25
Electronic Control Diagnostic Lights .............. 26
Electronic Control Test Cycle ........................ 26
Electronic Control Removal .......................... 26
Membrane Switch Replacement.................... 26
Temperature Sensor Testing ........................ 26
Temperature Testing ................................... 26
Temperature Sensor Removal....................... 27
Upper Front Panel Removal.......................... 27
Lower Front Panel Removal.......................... 27
Final Drive Belt Replacement........................ 27
Motor Drive Belt Replacement ...................... 27
Tumbler Pulley Removal and Installation ....... 27
Intermediate Pulley and Tension Arm Removal .. 28
Tension Arm Support Assembly Adjustment .. 28
Motor and Blower Assemly Removal
and Installation ..................................... 28
Air Flow Switch Operation and Adjustment.... 28
Ignition Transformer Fuse ............................ 28
Ignition Control Transformer ........................ 28
Electronic Ignition Module............................ 28
Spark Electrode Assembly Function .............. 29
Ignition System Function and Sequence........ 29
Ignition System Checkout ............................ 30
Spark Electrode Assembly Removal .............. 30
Gas Valve & Manifold Removal ..................... 30
Main Burner Orice Removal ........................ 30
Main Burner Removal................................... 30
Recirculation Chamber Inspection................. 30
Cylinder Removal ........................................ 30
Adjustment of Cylinder Assembly
with Front Panel Removed ..................... 30
Tumbler Through Bolt Access Cover.............. 31
Bearing Housing Removal ............................ 31
Section 5:
Troubleshooting
Electronic Control Diagnostic Lights .............. 34
Electronic Control Test Cycle ........................ 34
Trouble Shooting Fault Codes....................... 35
Troubleshooting Tips ...............................35-38
Section 6:
Parts Data
Cabinet Group........................................ 40-43
Door Switch Group ...................................... 44
Bearing Housing Group................................ 45
Burner Housing Group ............................ 46-47
Rear View .............................................. 48-49
Rear Panel & Cover Group ........................... 50
Tumbler Assembly Group ............................. 51
Control Assembly Group ..........................52-53
Coin Handling Group................................54-55
Wiring Group .............................................. 56
Section 7:
Voltage Conversion....................... 58-59
Section 8:
50hz Models
50 hz Wiring Schematic ...........................62-63
Gas Control Parts ................................... 64-66
Electrical Group.......................................67-68
Section 9:
Maintenance
Regular Required Maintenance .................69-70
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Notes

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Section 1:
Specications

Specications
50 lb. Comm.ercial Stack Dryer Model: T50x2 - DDBD50
Cabinet Height 79.625” 2023 mm.
Cabinet Width 34.5” 877 mm.
Overall Depth 53” 1346 mm.
Floor to Door Bottom 7.27” 185 mm.
Door Opening 25.69” 653 mm.
Dry Wt. Capacity 50 x 2 lbs. 22.7 x 2 kg.
Cylinder Diameter 32.5” 826 mm.
Cylinder Depth 33” 769 mm.
Cylinder Volume 15.84 cu. ft. 448 liters
Lint Screen Area 544 sq. in. 3509.67 sq. cm.
Gas Input/Hour (kW) (per pocket) 108,000 BTU (31.7)
Gas Supply Connection .5” 12.7 mm.
Natural Gas Supply (Water Column) 5-8”
L.P. Supply (Water Column) 11.5-14”
Exhaust Size 8” 203 mm.
Make-up Air 1.5 sq. ft. 1394 sq. cm.
Motor Size 3/4 H.P. .560 kW
Airow 600 CFM 600 CFM
Electrical Specications - 120/60/1
Voltage/Hz/Phase 120V/60Hz/1Phase
Running Amps 24.0
Circuit Protection Amps 30
Wire Size 10 gauge
Electrical Service 2 wire + ground
Electrical Specications - 220-240/60/1
Voltage/Hz/Phase 220-240V/60Hz/1Phase
Running Amps 12.0
Circuit Protection Amps 20
Wire Size 12 gauge
Electrical Service 3 wire + ground
Electrical Specications - 220-240/50/1
Voltage/Hz/Phase 220-240V/50Hz/1Phase
Running Amps 12.0
Circuit Protection Amps 20
Wire Size 12 gauge
Electrical Service 3 wire + ground
Shipping Weight 950 lbs. 431 kg.
Net Weight 850 lbs. 396 kg.
Clearance Behind Machines (min.) 18” 457 mm.
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Section 2:
Installation
& Operation

Installation and Operation
All commercial dryer installations must conform with local applicable local codes or in the absence of lo-
cal codes, with the National Fuel Gas Code ANSI Z223.1A-1988. 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. The appliance, when installed, must be electrically grounded in accordance with
the National Electric Code, ANSI/NFPA No. 70-1990,or when installed in Canada, with Standard CSA C22.1
Canadian Electrical Code Part 1.
Installation Clearances:
This unit may be installed at the following alcove clearances.
1. Left side- 0”
2. Right side- 0”
3. Back- 18” (Certied for 6” clearance: however 18” is required to clean, service,
and maintain the dryer).
4. Front- 48” to allow use of dryer.
5. Top- Refer to gure labelled “Vertical Clearance Dimensions”.
6. Floor- This unit may be installed upon a combustible oor.
Makeup Air
Adequate makeup air must be supplied to replace air exhausted by dryers on all types of installations.
Provide a minimum of 1 1/2 square feet of makeup air opening to the outside for each dryer. This is a net
requirement ofeective area. Screens, grills or louvers which will restrict the ow of air must be consid-
ered. Consult the supplier to determine the free area equivalent for the grill being used.
The source of makeup air should be located suciently away from the dryers to allow an even air ow 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
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NOTE: The following considerations must be observed for gas dryer instal-
lations where dry cleaners are installed. The sources of all makeup 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 an open ame such as the gas ame present in clothes dryers. The de-
composition products are highly corrosive and will cause damage to the dryer
ducts and clothes loads.
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. The electrical connection should be made to the terminal board,
on the rear of the unit, using #10 AWG wire for 120V, #12 AWG for 208-240V.
It is absolutely necessary that the dryer be grounded to a known ground. Individual circuit breakers for
each stacked dryer are required. Use 30A circuit breakers for 120V and a 20A circuit breakers for 208-
240V.
This dryer is adjusted for 120V as shipped. Conversion instructions to 208-240V are at the end of this
booklet.
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.
However, the size of the piping to supply the dryer should be determined by reference to the Fuel Gas
Code and consulting the local gas supplier.
A joint compound resistant to the action of liqueed petroleum gases should be employed in making pipe
connections. A 1/8 inch NPT plugged tapping, accessible for test gage connection, must be installed imm.
ediately upstream of the gas supply connection to the dryer.
A drip tee is provided in the unit gas piping to catch dirt and other foreign articles.
All pipe connections should be checked for leakage with soap solution or leak detector. Never check with
an open ame.
CAUTION: The dryer and its individual shuto 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. The dryer must be isolated from the gas supply
piping system by closing its individual manual shuto valve during any pressure
testing of the gas supply piping system at test pressures equal to or less than 1/2
psig.
Burner Set-Up
All gas burner manifolds should be checked for proper gas pressure while burning. Stack dryer burners
should be set at 3.5 W.C. while burner operating.
Exhaust Installation
Exhausting of the dryer should always be planned and constructed so that minimum air restrictions occur.
(Refer to Figure on dryer exhausting). Maximum static back pressure allowed at rear exit of dryer is .3 SBP.
Any restriction due to pipe size or type of installation can cause slow drying time, excessive heat, and
lint build up in system and the room.
18 Part # 8533-068-001 9/21

From an operational standpoint, incorrect or inadequate exhausting can cause cycling of the high limit
thermostat which shuts o the main burners and results in inecient drying.
Individual exhausting of the dryer is recomm.ended. All heat, moisture, and lint should be exhausted
outside by attaching a pipe of the proper diameter to the dryer adapter collars 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 ducts 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 aect the dryer operation if held within practical limits. For the most ecient operation, it is
recomm.ended that no more than 14 feet of straight 6” diameter pipe with two right angle elbows be used
for each cylinder. When more than two elbows are used, two feet of straight pipe should be removed for
each additional elbow. No more than two right angle elbows should be used to exhaust each cylinder.
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 recomm.ended 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. 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” of any objects which would cause air restrictions.
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 buildup which can be highly combustible.
Installation of several dryers where a main discharge duct is necessary, will need the following
considerations for installation. Whether using the 8” exhaust kit or individual 6” ducts, entrance into the
main discharge duct should be at a 45 degree angle in the direction of discharge air ow.
NOTE: A small diameter duct will restrict air ow, 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 in. w.c (7.6 mm
w.c) 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.
NOTE: The following illustration shows the various round main duct diameters to
use with the individual dryer ducts. The main duct can be rectangular or round,
provided adequate air ow is maintained. For each individual cylinder the total
exhausting (main discharge duct plus duct outlet from the dryer) should not exceed
the equivalent of 14 feet and two elbows. The diameter of the main discharge duct
at the last dryer must be maintained to exhaust end.
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Part # 8533-068-001 9/21

TRANSIENT VOLTAGE SURGE SUPPRESSORS
Like most electrical equipment your new machine can be damaged or have its life shortened by voltage
surges due to lightning 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 and 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 signicantly lengthening the useful life of
electronic components.
Electronic 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 links to a few suppliers of these devices for those who don’t
currenty have a source.
MANUFACTURER LINK
MCG Surge Protection mcgsurge.com
Eaton Corporation eaton.com/us/en-us
Schneider Electric se.com/us/en
Asco Power Technolgies ascopower.com/us/en
Emerson Electric Co. emerson.com/en-us
20 Part # 8533-068-001 9/21