Dexter Laundry DDAD50KC Series Operator`s manual

DDAD50KC Series Dryers
The dryer must not be stored or installed where it will be exposed to water and/or weather.
WARNING: For your safety the information in this manual must be followed to minimize the risk of fire or
explosion or to prevent property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
• 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
• 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.
Post the following “For Your Safety” caution in a
prominent location:
Do not store or use gasoline or other flammable
vapors or liquids in the vicinity of this or any other
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.
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.
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.
• 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 vous trouvez.
• Évacuez la pièce, le bâtiment ou la zone.
• Appelez immédiatement votre
fournisseour 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.
Ne pas enteposer ni utiliser d'essence ni d'autres
vapeurs ou liquides inflammables dans le voisinage
de cet appareil ou de tout autre appareil.
You, the purchaser, must post in a prominent location instructions to be followed in the event the user
smells gas. Consult your local gas supplier for
procedure to be followed if the odor of gas is
manufactured by
Dexter Laundry Inc.
2211 W. Grimes
Fairfield, Iowa 52556
Page No.
Warnings about use and operation .................................................................................... 2
Installation and Operating Instructions ...................................................................... 4, 5, 6
Dryer Shutdown ................................................................................................................. 8
Description of Controls ...................................................................................................... 8
Operating Instructions ....................................................................................................... 9
Changing Programmed Data ............................................................................................. 9
Options Available ............................................................................................................. 11
Electronic Coin Acceptor Setting................................ ..................................................... 11
Servicing Dryer and Preventive Maintenance.................................................................. 12
Conversion to 208-240V Instructions .............................................................................. 13
Figure 1 - Dryer Dimensions .............................................................................................. 3
Figure 2 - Vertical Clearance Dimensions ......................................................................... 5
Figure 3 - Dryer Exhausting ............................................................................................... 7
Figure 4 - Rear View of Controller ................................................................................... 10
Figure 5 - Stack Dryer Control Board .............................................................................. 11
KEEP SHIELDS, GUARDS AND COVERS IN PLACE. These safety devices are provided to protect everyone
from injury.
It is ABSOLUTELY ESSENTIAL that the dryer be grounded to a known earth (zero) ground in accordance with
local codes or, in the absence of local codes, with the latest editions of the National Electric Code, ANSI//NFPA 70
or Standard CSA C22.1 Canadian Electrical Code Part 1. This is not only for personal safety, but is necessary for
proper operation of the controller. Failure to do so will void the warranty of the controller.
or other similar activities. The hourmeter function adds only full hours to its reading. If the power is shut off every night,
any fraction of an hour of time that is on the machine at that time will be lost. Turning the power off every night could
also have some effect on the long term life of the memory after a number of years. Turing power off occasionally won’t
affect the unit.
From a safety aspect shutting off the gas supply at night would be better than shutting off the electrical power.
burner housing below the gas valve. Should the dryer cease to operate, refer to your “Service Procedure and Parts
Data” book for instructions.
CHECK THIS THERMOSTAT WHEN INSTALLING DRYER to assure it is not tripped. Impacts such as rough
handling in shipment, may trip the thermostat. It may be reset by inserting a wooden pencil or dowel through the
bushing in the cover.
4 3/4
6 7/8
86 1/4
79 3/8
34 1/2
Tools Required: 3/4" hex socket & ratchet driver, wood block 4" or 5" thick, a knife and a groove joint plier which will
open to 1 3/8".
1. Remove and discard packaging.
2. The crate base is attached to the dryer by (4) cap screws driven upward from below the crate base. Remove crate
base from dryer, by tipping dryer sidewise and place block under crate base rail in center of dryer. Using a ratchet
and 3/4" hex socket remove and discard (2) crating bolts from side which is raised. Remove block from under crate
base. Repeat for other side.
3. Install leveling legs. Using a walking motion, move dryer sideways about 6" off crate base. Tip dryer up and place
block under edge of dryer. Thread two leveling legs about two-thirds into the T-nuts on the base from which the crating
bolts were removed. Remove block from under dryer.
With a walking motion move dryer completely off crate base. Discard crate base.
Tip dryer sidewise, as previously done, and place block under edge of dryer on raised side. Thread leveling legs
into nuts as was done for the first side.
Slide unit into position where it will be installed. Adjust leveling legs, using the groove joint plier, to level and align
dryer with adjacent units.
Install exhaust transition. Remove transition and 4 screws from dryer drum. Attach to top of exhaust as shown on Pg. 3.
1. CODE OF CONFORMITY. All commercial dryer installations must conform with local codes or, in the absence
of local codes, with the Nation 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. 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.
2. INSTALLATION CLEARANCES: This unit may be installed at the following alcove clearance. (millimeters)
I. Left Side
II. Right Side
III. Back
IV. Front
V. Top
VI. Floor
18" (457) (Certified for 6" (152) clearance; however, 18" (457) clearance is necessary behind
the motors to allow servicing and maintenance.)
48" (1220) (to allow use of dryer)
Refer to figure labeled “Vertical Clearance Dimensions”.
AB. Certification allows 0" clearance at the top 4" (102) back from the front.
However, a 1/4" (6) clearance should be allowed in case the dryer needs moving.
C. A 10" (254) clearance is required from top at all other points.
This unit may be installed upon a combustible floor.
Do not obstruct the flow of combustion and ventilation air.
Maintain minimum of 1" (25) clearance between duct and combustible material.
Refer to the label attached to the Belt Guard on the rear of the dryer for other installation information and start-up
3. MAKE-UP AIR. Adequate make-up air (500CFM/DRUM, 1000CFM/DRYER) must be supplied to replace air
exhausted by dryers on all types of installations. Provide a minimum of 1 1/2 square feet 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 air flow 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. 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 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.
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. However, the size of the piping to supply the dryer should
be determined by reference to the National Fuel Gas Code ANSI Z223.1A and consultation with the local gas supplier.
A joint compound resistant to the action of liquefied petroleum gases should be employed in making pipe
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 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. Never check with an open flame.
For altitudes above 2,000 feet (610m) it is necessary to derate the BTU input. Contact your local distributor for
L.P. gas conversion kits are available for this dryer. Contact your local distributor.
CAUTION: 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. 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.
6. EXHAUST INSTALLATION. (Refer to Figure 3 at the end of section 6.) 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.
The exhaust duct connection near the top of the dryer will accept an 8” round duct. 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 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 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 a minimum of 1” (25mm) 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. 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 in. (610 mm) of any objects which would cause air
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 (see Figure 3). Individual 8” exhaust ducts from each dryer should enter main discharge duct
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. Figure 3 indicates the various round main duct diameters to use with the individual
dryer ducts. The main duct can be rectangular or round, provided adequate air flow is
maintained. The total exhausting (main discharge duct plus duct outlet from the dryer)
should not exceed the equivalent of 14 ft. (4.25 m) 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.
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-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 electrical power is connected correctly. 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 wit for five minutes
before turning it back on.
C. Turn on the main electrical power switch. The dryer may be started by following the "Operating Instructions"
found later in this manual.
D. Natural gas and LPG fired dryers operate in the same manner. When the gas valve relay contacts are closed
(indicating a demand for heat), the solid state ignition control will automatically supply energy to the redundant gas
valve. Sparking will continue until a flame is detected by the sensing probe, but not longer than ten seconds. If the
gas fails to ignite in 10 seconds, the gas valve closes and the gas system pauses to allow gas to purge from the inside
of the dryer. After the pause, the ignition control repeats the ignition trial cycle twice more. If the gas system fails
to detect ignition after the three attempts, the system will "lock out". No further attempts will be performed
automatically. To reset the ignition control electrical power to the ignition control must be interrupted. This can be
done by opening the dryer door (stopping the dryer) for 15 seconds. Closing the door and pushing the "Start" button
will repeat the ignition trial cycle.
8. MAIN BURNER ADJUSTMENT. The primary air shutter of each main burner must be properly adjusted for the correct
air-gas ratio. Loosen the shutter locking screw. Adjust the shutter by closing it sufficiently to give a blue flame with a
yellow tip. Next open the shutter until the yellow tips are at a minimum. After adjustment securely lock each shutter in
position by tightening the shutter locking screws.
To render the dryer inoperative, turn off the main gas shut off valve and disconnect the electrical supply to the dryer.
Both drums are controlled by the controller at the right midpoint of the dryer. The controller is two-in-one with the upper
display and lights dedicated to the upper drum and lower display and lights dedicated to the lower drum.
The green light to the left of the display flashes to indicate money has been deposited. Time is not added until the upper or
lower drum is selected. If no purchased time is available on the control, the vend price is displayed. At the end of the cycle
(when time has expired), the displays flash until the door is opened.
The drying program (temperature) selected by the user are indicated by the red lights at the top and bottom. When the dryer
is in use, the drying temperature may displayed by simultaneously pressing the start switch and switch of the temperature
All programmed data and cycle time remaining are protected from power interruptions of any length.
Some Dexter dryers are factory equipped with a card reader that is used with Dexter's Easy Card debit card system. The card
reader signals the dryer control when money is debited from the user's card account to satisfy the price of the dry time. The
dryer's pricing and the Easy Card system pricing are completely independent of each other and must be separately
programmed and coordinated. Refer to the instructions that came with the Easy Card system for complete information.
1. Load clothes into either the upper or lower drum (or both). Close the door(s) completely.
2. Deposit coin or coins equal to or greater than the displayed vend price. Upon deposit of the first coin, the green
light will flash on and off. This light will continue to flash, while additional money may be deposited, until either
the upper drum or lower drum is selected.
3. Select drying temperature by pressing the appropriate switch for the drum to be used. This will put out the green
flashing light, turn on the red light showing the selected temperature and display the amount of time purchased.
4. Press start switch to start drum.
-Opening the door will stop the drum. The drum will restart, if time has not expired, upon closing the door and
pressing the start switch.
-Selected temperature may be changed at any time.
-Running time may be extended by depositing money and pressing the temperature or start switch for the correct
drum. Unless time has expired, the controller will accept coins whether or not the original vend price is equaled.
If time has run out the dryer must be restarted as it was at the beginning of drying the load which requires meeting
or exceeding the vend price.
All operating parameters (vend price, temperature, cool-down times) are adjustable. Hours run and money count
information can be displayed and these registers are resettable to zero. There are seventeen programming steps.
These seventeen steps are:
Lower Drum Hour Meter
Upper Drum Hour Meter
Left Coin Audit
Right Coin Audit
Hot Dry Temperature (Regular)
Medium Dry Temperature (Permanent Press)
Warm Dry Temperature (Delicates)
Left Coin Value
Right Coin Value
Vend Price
Time Per Coin
Time Per Right Coin
Free Vend Time
Hot Dry Cool Down Time
Medium Dry Cool Down Time
Warm Dry Cool Down Time
Temperature Scale
Decimal Point Display
Seconds on Display
0-9999 Hours
0-9999 Hours
0-9999 Coins
0-9999 Coins
0-9999 cents
0-9999 cents
0-9999 cents
0-99:55 Min:Sec
0-99:55 Min Sec
0-99:55 Min:Sec
0-10:00 Min:Sec
0-10:00 Min:Sec
0-10:00 Min:Sec
°F - °C
5 sec
5 sec
5 Sec
5 Sec
5 Sec
5 Sec
The controller is put into the programming mode by opening both dryer doors and actuation of a switch on the
controller circuit board and remains in this mode until one of these actions occur:
1. The switch is actuated again.
2. The seventeenth step is completed and the step switch is pushed following the seventeenth step.
3. Programming is stopped for about one minute.
4. The dryer doors are closed.
Four of the membrane switches on the front of the controller become programming switches and both displays
become programming aids.
1. The lower hot switch will advance the controller through the seventeen steps which can be observed or altered.
2. The upper start switch will increase values, the lower start switch will decrease values.
3. The lower perm press switch will restore the value for the program step being displayed to the original value
before it was altered. Also this will return the registers for hours and money to zero if pressed in the appropriate
programming step. (Steps 00 through 03.)
1. Open both the upper and lower loading doors.
2. Unlock the control tray, carefully slide the control tray assembly forward about three inches. Press the program
switch. (See fig. 4 “Rear View of Controller”) Reinstall and lock the controller.
The controller is now in the program mode at the “00” step, displaying the hours run by the lower drum. (Refer
to the table defining the steps.)
This value displayed can be reset to “0” or observed and left as is. Pressing the lower hot switch will advance
the controller through the fifteen remaining steps allowing observation or alteration.
Note that on any program change or reset it is necessary to advance to the next step by pressing the lower hot
switch to enter the revision. Otherwise the value will remain as it was before the alteration.
FIGURE 4 - Top View Of Controller.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after servicing.
ATTENTION. Lors des opérations d'entretien des commandes, étiqueter tous les fils avant de les déconnecter. Toute
erreur de câblage peut être une source de danger et de panne.
1. Clean lint screen using a soft brush if necessary. Check lint screen for rips or tears and replace if damaged.
1. Clean lint from motor end bells and dryer controls area.
2. Clean lint from lint screen compartment.
3. Clean lint accumulation from top and all areas above, around and below burners and burner housing. Failure
to keep this section of dryer free from lint can create a fire hazard.
1. Check V-belts for cracks, wear, fraying, or looseness.
2. Inspect all fasteners (screws, bolts, nuts, etc.) and tighten any that are loose.
3. Clean all lint accumulation from inside of front panel.
4. Place a few drops of light oil on top and bottom pivots of the door hinge.
5. Inspect door glass gasket for excessive wear.
6.Clean lint accumulation from the burner primary air ports.
7.Check intermediate drive pulley bushings for excessive wear.
1. Remove, inspect and clean main burner orifices of obstructions or dirt.
2. Grease intermediate drive pulley bearing at zirk grease fitting.
3.Inspect and remove any lint accumulation in the exhaust ducts. Inspect all ducting from the dryer exhaust
connection to the exit wall or roof.
4.Check tumbler shaft retaining nut for 125 Ft. pound torque.
Instructions - Convert a Dual Voltage Stack Dryer
from 120V to 208-240V with Neutral Wire Only
1. Remove incoming power from the dryer. Use a known working voltmeter to check power.
2. Remove the cover of the control box assembly from the dryer using a 5/16” wrench.
3. Move the black/blue wire from the N position of the main power terminal block to the L2
position of the main power terminal block in the control box assembly. See Figure 1 below.
4. Move the white wire of the upper motor harness to an upper inner left terminal in the middle
terminal block in the control box assembly. See Figure 1 below.
5. Move the orange wire of the upper motor harness to an upper inner left terminal in the middle
terminal block control box assembly. See Figure 1 below.
6. Move the white wire of the lower motor harness to a lower inner left terminal in the middle
terminal block in the control box assembly. See Figure 1 below.
7. Move the orange wire of the lower motor harness to a lower inner left terminal in the middle
terminal block control box assembly. See Figure 1 below.
8. Reconnect power to the dryer and test to ensure proper operation; one line voltage to L1, one
line voltage to L2, the neutral to N, and the earth ground to E.
Reinstall the cover of the control box assembly from the dryer using a 5/16” wrench.
Figure 1 Dual Voltage Stack Dryer Voltage Conversion
Contact Information:
Dexter Laundry Inc.
2211 W. Grimes Ave.
Fairfield, IA 52556