Dexter Laundry DDAD30HC-11 Series User manual

8514-154-001PR
01/09
OPERATOR'S MANUAL
For DDAD30HC-11 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 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 telephone in your building.
-Clear the room, building or area of all occupants.
-Immediately call your gas supplier from a neighbor’s telephone. 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.
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 present.
Post the following “For Your Safety” caution in a prominent location:
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance.
FOR YOUR SAFETY
THIS MACHINE IS FOR DRYING ONLY FABRICS CLEANED IN WATER.To
avoid possibility of fire, including spontaneous combustion, do not dry oiled floor mops, items
containing foam rubber or similarly textured rubberlike materials or any material on which you
have used a cleaning solvent or which contains flammable liquids or solids (such as gasoline,
kerosene, waxes, etc.)
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:
Dexter Laundry, Inc
2211 W. Grimes
Fairfield, Iowa 52556

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French Language Warnings
POUR VOTRE SÉCURITÉ
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.
I. 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 oú 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 founisseur 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 dan le voisinage
de cet appareil ou de tout autre appareil.
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.

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TABLE OF CONTENTS
DRYER DIMENSIONS (Figure 1) 4
UNCRATING 5
INSTALLATION CLEARANCE (Figure 2) 6
DRYER EXHAUST SYSTEM (Figure 3) 9
DRYER SHUTDOWN 10
TOUCH PAD LAYOUT (Figure 4) 11
DRYER DEFAULT SETTINGS 12
DRYER FAULT CODES 12
TOUCH PAD DESCRIPTION 13
OPERATING INSTRUCTIONS 15
PROGRAMMING INSTRUCTIONS 17
SERVICINGDRYER 23
PREVENTATIVE MAINTENANCE 23
WARNINGS ABOUT USE AND OPERATION
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.
KEEP SHIELDS, GUARDS AND COVERS IN PLACE. These safety devices are provided
to protect everyone from injury.
THIS DRYER IS EQUIPPED WITH A MANUALLY RESETTABLE OVER-
TEMPERATURE THERMOSTAT located on the end of the burner housing above 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 (nonconductive) pencil or dowel through the guide bushing in the cover.
NOTE: THIS APPLIANCE SHALL NOT BE USED TO DRY OFF SOLVENTS OR DRY-
CLEANING FLUIDS.

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Figure 1, 30# Stack Dryer Dimensions, inches (mm)

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INSTALLATION AND OPERATING INSTRUCTIONS
UNCRATING AND PLACING DRYER
Tools Required: 3/4" hex socket & ratchet driver, wood block 4" or 5" thick, a knife and a
groove joint pliers, 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
pliers, to level and align dryer with adjacent units.
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-B1 49(.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 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
clearances.
I Left side 0"
II Right side 0"
III Back 18" [457] (Certified for 6" [25] clearance; however, 18" [457] clearance is
necessary behind the belt guard to allow for servicing and maintenance)
IV Front 48" [1219] to allow use of dryer.

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V Top 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.
VI. Floor 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 instructions.
3. MAKE-UP AIR. Adequate make-up air (600CFM/DRUM, 1200CFM/DRYER [34 m3/min])
must be supplied to replace air exhausted by dryers on all types of installations. Provide a
minimum of 1.5 ft² [0.14 m²] of make-up air opening to the 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.
NOTE: The following considerations must be observed for gas dryer installations where dry
cleaners are installed. 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

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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 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. (Refer to schematic and wiring diagram). This dryer
is equipped with a control transformer for use on 208-240V-1PH-60Hz. The control voltage is
24V-60 Hz. 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 in the control box on the rear of the unit, using #12 AWG for
208-240V (no neutral required).
It is absolutely necessary that the dryer be grounded to a known ground.
Individual circuit breakers for each stacked dryer are required. Use 15A or 20A circuit
breakers for 208-240V.
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-1988 and consultation with the local gas supplier.
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 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 instructions.
L.P. gas conversion kits are available for this dryer. Contact your local distributor.
6. PRESSURE TESTING. 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 pressure in
excess of 1/2 PSIG [35mbar]. 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 [35mbar].
7. EXHAUST INSTALLATION. (Refer to Figure 3 at the end of section 7.) Exhausting of

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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 oval exhaust duct connection near the top of the dryer will accept a compressed 8” round
duct. Individual exhausting of the dryers is recommended. A pipe of the proper diameter should
be attached to the dryer adapter collar and extended out through an outside wall to exhaust all
heat, moisture, and lint outside. 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
[4.27m] of straight 8” diameter pipe with two right angle elbows is 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 four right angle elbows should be used to exhaust a dryer.
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. 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 that 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 under any
conditions. In both cases, there is a danger of lint build-up, which can be highly combustible.

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Installation of several dryers, where a main discharge duct is necessary, will need the
following considerations for installation (see Figure 3). Individual 8" ducts from the dryers into
the main discharge duct should be at a 45-degree angle in the direction of discharge airflow.
NOTE: Never install the individual 8" 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 airflow is maintained. For each individual dryer, the total
exhausting (main discharge duct plus duct outlet from the dryer) should not
exceed the equivalent of 14 ft (4.27m) 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 airflow; 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.
8. 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 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.
C. Turn on main electrical power switch, close loading door, use manual mode to set the

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cycle time, and actuate the dryer by pushing the start button.
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, open the dryer door
(stopping the dryer) for 15 seconds to interrupt electrical power to the ignition control. Closing
the door and pushing the "Start" button will repeat the ignition trial cycle.
9. 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.
DRYER SHUTDOWN
To render the dryer inoperative, turn off the main gas shut-off valve and disconnect power to
the dryer.