American Dryer Corp AD-758 User Manual
AD-758
Service Manual
American Dryer Corporation
88 Currant Road
Fall River, MA 02720-4781
Telephone: (508) 678-9000 / Fax: (508) 678-9447
e-mail: techsupport@amdry.com
www.amdry.com
052802ASILVA/mcronan ADC Part No. 450418
Retain This Manual In A Safe Place For Future Reference
American Dryer Corporation products embody 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.
FOR YOUR SAFETY
Do not store or use gasoline or
other flammable vapors and
liquids in the vicinity of this or
any other appliance.
We have tried to make this manual as complete as possible and hope you will find it useful. ADC 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.
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.
Important
For your convenience, log the following information:
DATE OF PURCHASE ____________________________ MODEL NO. __________________________________________
RESELLER’S NAME _______________________________________________________________________________________
Serial Number(s) ________________________________________________________________________________________
________________________________________________________________________________________
AD-758
________________________________________________________________________________________
Replacement parts can be obtained from your reseller or the ADC factory. When ordering replacement parts from the factory,
you can FAX your order to ADC at (508) 678-9447 or telephone your order directly to the ADC Parts Department at (508)
678-9000. Please specify the dryer model number and serial number in addition to the description and part number, so that
your order is processed accurately and promptly.
The illustrations on the following pages may not depict your particular dryer exactly. The illustrations are a composite of the
various dryer models. Be sure to check the descriptions of the parts thoroughly before ordering.
“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.
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 (Occupational Safety and
Health Administration) STANDARDS.
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE
VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER
APPLIANCE .
DO NOT DRY MOP HEADS IN THE DRYER.
DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.
CAUTION
DRYERS SHOULD NEVER BE LEFT UNATTENDED WHILE IN
OPERATION.
WARNING
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR
THE DRYERS.
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYER(S) IN
OPERATION.
WARNING
The dryer must never be operated with any of the back guards, outer
tops, or service panels removed. PERSONAL INJURY OR FIRE COULD
RESULT.
WARNING
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT
FILTER OR SCREEN IN PLACE, EVEN IF AN EXTERNAL LINT
COLLECTION SYSTEM IS USED.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed on the
equipment and specified in the installation manual included with the dryer.
The wiring diagram for the dryer is located in the front electrical control box area.
Table of Contents
SECTION I
IMPORTANT INFORMATION..........................................................................3
A. Safety Precautions ....................................................................................................................... 3
SECTION II
ROUTINE MAINTENANCE ..............................................................................5
A. Cleaning ...................................................................................................................................... 5
B. Adjustments ................................................................................................................................ 6
C. Lubrication.................................................................................................................................. 6
SECTION III
INSTALLATION REQUIREMENTS .................................................................7
A. Enclosure, Air Supply, and Exhaust Requirements......................................................................... 7
B. Electrical and Gas Requirements .................................................................................................. 8
C. Operational Service Check Procedure ......................................................................................... 8
SECTION IV
DESCRIPTION OF PARTS ..............................................................................10
A. Control Panel (Microprocessor) ................................................................................................ 10
B. Control Panel (Non-Microprocessor) ........................................................................................ 10
C. Control Box.............................................................................................................................. 10
D. Direct Spark Ignition (DSI) Module (Gas Models Only) ..............................................................11
E. Gas Burner Assembly .................................................................................................................11
F. Drive Motor ...............................................................................................................................11
G. Blower Motor and Impellor (Non-Reversing) ............................................................................. 12
H. Blower Motor and Impellor (Reversing) ..................................................................................... 12
I. Idler Assembly .......................................................................................................................... 12
J. Basket (Tumbler) Bearing and Pulley Arrangement ..................................................................... 12
K. Basket (Tumbler)....................................................................................................................... 13
L. Main Door Switch..................................................................................................................... 13
M. Sail Switch (Gas Models Only) .................................................................................................. 13
N. Hi-Limit (Gas Models Only) ...................................................................................................... 14
O. Automatic Reset Thermostat ...................................................................................................... 14
P. Lint Drawer............................................................................................................................... 14
Q. Lint Drawer Switch ................................................................................................................... 15
R. Steam Damper System .............................................................................................................. 15
S. Compressed Air Requirements................................................................................................... 15
T. Temperature Sensor Bracket (Noncomputer) ............................................................................. 15
SECTION V
SERVICING .......................................................................................................16
Introduction.................................................................................................................................... 16
A. Computer Controls .................................................................................................................... 17
B. Ignition Controls ........................................................................................................................ 18
C. Thermostats .............................................................................................................................. 22
D. Sail Switch Assembly (Gas Models Only) .................................................................................. 23
E. Front Panel and Main Door Assemblies ..................................................................................... 24
F. Pulleys ...................................................................................................................................... 27
G. Basket (Tumbler) Assembly ....................................................................................................... 29
H. Bearings (Refer To The Illustrations In Section F “Pulleys”) ........................................................ 31
I. V-Belts (Refer To The Illustrations In Section F “Pulleys”) .......................................................... 33
J. Motors and Impellors ................................................................................................................ 34
K. To Replace Lint Drawer Switch ................................................................................................. 36
SECTION VI
TROUBLESHOOTING .....................................................................................37
SECTION VII
ELECTRICAL TROUBLESHOOTING ...........................................................41
A. Phase 5 OPL System Diagnostics .............................................................................................. 41
B. L.E.D. Display Indicators .......................................................................................................... 42
C. L.E.D. Display/Codes ............................................................................................................... 44
D. Computer Logic and Wiring Diagram ......................................................................................... 48
SECTION VIII
TECHNICAL INFORMATION.........................................................................53
A. Motor Data Label (High and Low Voltage) ................................................................................ 53
B. Data Label ................................................................................................................................ 54
C. Using A Manometer................................................................................................................... 55
D. Tool List.................................................................................................................................... 56
3
SECTION I
IMPOR TANT INFORMATION
A. SAFETY PRECAUTIONS
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.
WARNING: The dryer must never be operated with any of the back guards, outer tops, or
service panels removed. PERSONAL INJURY OR FIRE COULD RESULT.
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
2. 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.
3. WHAT TO DO IF YOU SMELL GAS...
a. DO NOT try to light any appliance.
b. DO NOT touch any electrical switch.
c. DO NOT use any phone in your building.
d. Clear the room, building, or area of ALL occupants.
e. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
f. If you cannot reach your gas supplier, call the fire department.
4. Installation and service must be performed by a qualified installer, service agency, or gas supplier.
5. Dryer(s) must be exhausted to the outdoors.
6. Although ADC produces a very versatile dryer, there are some articles that, due to fabric composition or
cleaning method, should not be dried in it.
WARNING: Dry only water washed fabrics. DO NOT dry articles spotted or washed in dry
cleaning solvents, a combustible detergent, or “all purpose” cleaner.
EXPLOSION COULD RESULT.
WARNING: DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint,
or wax.
EXPLOSION COULD RESULT.
4
WARNING: DO NOT dry mop heads. Contamination by wax or flammable solvents will create a
fire hazard.
WARNING: DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubber materials. Drying in a heated basket (tumbler) may damage
plastics or rubber and may be a fire hazard.
7. 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.
WARNING: The collection of lint in the burner area and exhaust ductwork can create a potential fire
hazard.
8. 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 do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switches, lint door switch, heat safety circuit
ever be disabled.
WARNING: PERSONAL INJURY OR FIRE COULD RESULT.
10. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
11. Remove articles from the dryer as soon as the drying cycle has been completed.
WARNING: Articles left in the dryer after the drying and cooling cycles have been completed can
create a fire hazard.
12. DO NOT operate steam dryers with more than 125 PSI (8.61 bars) steam pressure. Excessive steam
pressure can damage steam coil and/or harm personnel.
13. Replace leaking flexible hoses or other steam fixtures immediately. DO NOT operate the dryer with
leaking flexible hoses. PERSONAL INJURY MAY RESULT.
14. READ AND FOLLOW ALL CAUTION AND DIRECTION LABELS ATTACHED TO THE
DRYER.
WARNING: 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 (Occupational Safety and Health Administration)
STANDARDS.
5
SECTION II
ROUTINE MAINTENANCE
A. CLEANING
A program and/or schedule should be established for periodic inspection, cleaning, and removal of lint from
various areas of the dryer, as well as throughout the ductwork system. The frequency of cleaning can best be
determined from experience at each location. Maximum operating efficiency is dependent upon proper air
circulation. The accumulation of lint can restrict this airflow. If the guidelines in this section are met, an ADC
dryer will provide many years of efficient, trouble free, and most importantly, safe operation.
WARNING: LINT FROM MOST FABRICS IS HIGHLY COMBUSTIBLE. THE
ACCUMULA TION OF LINT CAN CREATE A POTENTIAL FIRE HAZARD.
WARNING: KEEP DRYER AREA CLEAR AND FREE FROM COMBUSTIBLE
MATERIALS, GASOLINE, AND OTHER FLAMMABLE VAPORS AND
LIQUIDS.
NOTE: Suggested time intervals shown are for average usage which is considered six (6) to eight (8)
operational (running) hours per day.
Clean lint drawer and screen every third or fourth load.
NOTE: Frequency can best be determined at each location.
DAILY
Beginning of each work shift.
Clean lint from the drawer and screen. Inspect lint screen and replace if torn.
WEEKLY
Clean lint accumulation from lint chamber, thermostat, and microprocessor temperature sensor (sensor bracket)
area.
WARNING: To avoid the hazard of electrical shock, discontinue electrical supply to the dryer.
STEAM DRYERS
Clean steam coil fins using compressed air and a vacuum cleaner with brush attachment.
NOTE: When cleaning steam coil fins, be careful not to bend the fins. If the fins are bent, straighten by
using a fin comb, which is available from local air conditioning supply houses.
6
90 DAYS
Remove lint from basket (tumbler), drive motors, and surrounding areas. Remove lint from gas valve burner
area with a dusting brush or vacuum cleaner attachment.
NOTE: To prevent damage, avoid cleaning and/or touching the ignitor/flame-probe assembly.
Remove lint accumulation from inside control box and at rear area behind control box.
6 MONTHS
Inspect and remove lint accumulation in customer furnished exhaust ductwork system and from dryer’s internal
exhaust ducting.
WARNING: THE ACCUMULA TION OF LINT IN THE EXHAUST DUCTWORK CAN
CREA TE A POTENTIAL FIRE HAZARD.
WARNING: DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILA TION
AIR. CHECK CUSTOMER FURNISHED BACK DRAFT DAMPER IN THE
EXHAUST DUCTWORK. INSPECT AND REMOVE ANY LINT
ACCUMULATION, WHICH CAN CAUSE THE DAMPER TO BIND OR STICK.
NOTE: A back draft damper that is sticking partially closed can result in slow drying and shut down of
the heat circuit safety switches or thermostats.
NOTE: When cleaning dryer cabinet(s), avoid using harsh abrasives. A product intended for the
cleaning of appliances is recommended.
B. ADJUSTMENTS
7 DAYS AFTER INSTALLATION AND EVERY 6 MONTHS THEREAFTER
Inspect bolts, nuts, screws, (bearing setscrews), grounding connections, and nonpermanent gas connections
(unions, shutoff valves, and orifices). Motor and drive belts should be examined. Cracked or seriously frayed
belts should be replaced. Tighten loose V-belts when necessary. Complete operational check of controls and
valves. Complete operational check of ALL safety devices (door switches, lint drawer switch, sail switch,
burner, and hi-limit thermostats).
C. LUBRICATION
The motor bearings, idler bearings...and under normal/most conditions the basket (tumbler) bearings are permanently
lubricated. It is physically possible to re-lubricate the basket (tumbler) bearings if you choose to do so even
though this practice is not necessary. Use Shell Alvania #2 or its equivalent. The basket (tumbler) bearings used
in the dryer DO NOT have a grease fitting. Provisions are made in the bearing housing for the addition of a
grease fitting which can be obtained elsewhere.
The impellor (fan) shaft bearings should be lubricated every 3 months.
7
SECTION III
INST ALLATION REQUIREMENTS
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 Z223.1LATEST 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 (Liquid Propane [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).
A. ENCLOSURE, AIR SUPPLY, AND EXHAUST REQUIREMENTS
NOTE: The following information is very brief and general. For a detailed description, refer to the
Installation Manual supplied with the dryer.
Bulkheads and partitions around the dryer should be made of noncombustible materials. Allowances should
be made for the opening and closing of the control door and lint drawer. Also, allowances should be made in the
rear for ease of maintenance. (Refer to the appropriate Installation Manual for recommended distances and
minimum allowances required.)
When the dryer is operating, it draws in room air, heats it, passes this air through the basket (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 on gas dryers may result, and you also could have premature motor failure from
overheating. The air supply must be given careful consideration to insure proper performance of each dryer.
IMPORTANT: Make-up air must be provided from a source free of dry cleaning fumes. Make-up
air that is contaminated by dry cleaning fumes will result in irreparable damage to the
motors and other dryer components.
Exhaust ductwork should be designed and installed by a competent technician. Improperly sized ductwork will
create excessive back pressure, which will result in slow drying, increased use of energy, and shutdown of the
burner by the airflow (sail) switch, burner hi-limit or lint chamber hi-heat protector thermostat. (Refer to the
appropriate Installation Manual for more details.)
CAUTION: IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORK CAN
CREATE A POTENTIAL FIRE HAZARD.
8
B. ELECTRICAL AND GAS REQUIREMENTS
It is your responsibility to have ALL electrical connections made by a properly licensed and competent electrician
to assure 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.
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 (Liquid Propane [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 and slow drying and can create a safety
hazard.
The dryer must be connected to the type of gas (natural or L.P.) indicated on the dryer data label. If this
information does not agree with the type of gas available, contact the reseller who sold the dryer or contact the
factory.
The gas 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 for dryers in the field for elevations over 2,000 feet (609.6 meters) is made by
changing the burner orifices. If this adjustment is necessary, contact the reseller who sold the dryer or contact
the factory.
NOTE: Any burner changes must be made by a qualified technician.
C. OPERATIONAL SERVICE CHECK PROCEDURE
1. Turn on electric power to the dryer.
2. To start dryer:
a. Display will read “FILL.”
b. Press “E” on the keyboard (touch pad) of the microprocessor controller (computer).
c. The dryer will start, and the display will show “dr30.”
9
NOTE: Pressing keyboard (touch pad) “A,” “B,” “C,” “D,” or “F” will also start the dryer. Six (6)
preprogrammed drying cycles (“A” through “F”) have been stored in the computer’s memory.
(Refer to the Computer Operator’s Manual for details.)
3. Make a complete operational check of ALL the operating controls to assure that the timing is correct,
temperature selection switches are functioning, etc.
4. Make a complete operational check of ALL safety-related circuits: door switch(es), hi-limit thermostat, sail
switch, cycling thermostats, etc.
5. For gas dryers a gas pressure test should be taken at the gave valve pressure tap of each dryer to assure
that the water column (W.C.) pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the pressure tap on the gas valve body):
Natural Gas------------------- 3.5 Inches (8.7 mb) Water Column.
Liquid Propane (L.P.) Gas ---- 10.5 Inches (26.1 mb) Water Column.
6. If computer program changes are required, refer to the Phase 5 OPL Operator’s Manual (ADC P/N
112147) for details.
7. The dryer should be operated through one (1) complete cycle to assure that no further adjustments are
necessary and that ALL components are functioning properly.
8. Check the electric service phase sequence. While the dryer is operating, check to see if the blower wheel
is rotating in the proper direction. Looking from the front, the blower wheel should spin in the clockwise
(CW) direction. If so, the phasing is correct. If the phasing is incorrect, reverse two (2) leads at connections
L1, L2, or L3 of power supply to the dryer.
10
SECTION IV
DESCRIPTION OF PARTS
A. CONTROL PANEL (MICROPROCESSOR)
Lifting the control door will reveal the control panel
assembly. Opening the control panel will allow
access to the major components which include the
computer board and keyboard (touch pad). The
keyboard (touch pad) inputs to the computer what
temperature and program has been selected. The
computer controls the entire operation of the dryer.
It accepts inputs and gives outputs to various parts
throughout the dryer.
B. CONTROL PANEL (NON-MICROPROCESSOR)
On models without microprocessors, a timer is used to set a specific time. Most non-microprocessor dryers are
built with dual timers, a 60 minute dry timer and a 15 minute cool down timer. The temperature selector switch
selects the “Hi,” “Perm Press,” or “Lo Temp.” The “Push To Start” relay activates the dryer which starts the
drying cycle.
PRIOR TO NOVEMBER 3, 2000 AS OF NOVEMBER 3, 2000
C. CONTROL BOX
Lifting the control door and opening the computer panel
will reveal the control box. Inside the control box are
ALL the electronic control components. Located on
the back of the control panel is the computer. Included
in the control box are the 30-position block, fuse block,
and transformer.
11
D. DIRECT SPARK IGNITION (DSI)
MODULE (GAS MODELS ONLY)
The DSI module is a 24 VAC device designed to be
the “controller” of the DSI system. When activated
by the dryer controls, this module constantly monitors
and controls the functions of the DSI system (i.e., spark
activation, gas valve off and on, flame verification, etc.).
Additionally, the DSI module has self-diagnostic
capabilities.
E. GAS BURNER ASSEMBLY
Gas heated dryers are equipped with a gas burner
assembly consisting of four (4) burner tubes, gas valve,
spark ignition probe assembly, sail switch, and hi-limit
thermostat. The inlet piping enters through the rear of
the dryer on the left-hand side (viewing from the front)
and runs to the front of the dryer where the gas valve is
located.
F. DRIVE MOTOR
The totally enclosed, fan-cooled (T.E.F.C.) drive motor is
located approximately lower center of the dryer. It sits
on an adjustable base so that the motor can be easily
adjusted to the left or right, up or down, forward or
backward. The drive motor is a 1 HP (0.75 kw) motor
and operates on 208 to 460 volts, 3-phase (3Ø), 50/60 Hz.
12
G. BLOWER MOTOR AND IMPELLOR
(NON-REVERSING)
(Viewing from the front of the dryer). The blower motor
is located on the back of the dryer at the lower right-hand
corner. The impellor is a backward curved paddle wheel
which is directly connected to the shaft of the blower
motor.
H. BLOWER MOTOR AND IMPELLOR
(REVERSING)
I. IDLER ASSEMBLY
(Viewing from the rear of the dryer). The idler assembly
is located approximately on the lower center of the dryer.
The idler assembly consists of two (2) idler pulleys, the
small and large pulleys. The idler’s main purpose is to
reduce the speed and increase torque provided to the
basket (tumbler) bearing. Also, at the idler assembly, belt
tension can be adjusted.
J. BASKET (TUMBLER) BEARING
AND PULLEY ARRANGEMENT
The basket (tumbler) bearing and pulley arrangement is
located (viewing from the rear of the dryer) approximately
at the upper center of the dryer. The arrangement consists
of a pulley and two (2) bearings which serve to drive,
adjust, and support the basket (tumbler).
13
K. BASKET (TUMBLER)
The basket (tumbler) consists of four (4) ribs and four (4)
perforated panels, along with a front and back, which are
screwed together as an assembly. The basket (tumbler) also
consists of tie rods, which support the basket (tumbler) from
the front to back. The basket (tumbler) support is used to
mate the basket (tumbler) to the drive system in the rear.
L. MAIN DOOR SWITCH
The main door switch is located in the main door hinge block.
When the main door opens, the switch will also open,
preventing the dryer from operating. The main door switch
is a safety device and should never be disabled.
M. SAIL SWITCH (GAS MODELS ONLY)
The sail switch is located on the front of the burner
box. A sail switch consists of a round damper plate
on a lever arm which is in contact with an electric
switch. When the air blower comes on, it draws air
through the gas burner. This creates a negative
pressure inside the burner box, and this negative
pressure pulls in the round damper and activates the
sail switch. If there is improper airflow, the damper
will not pull in, preventing the burner from starting.
Improper airflow can be caused by improperly designed exhaust ducting where the duct run is too long or has too
many sharp bends in it. It can also be caused by a lack of make-up air.
14
N. HI-LIMIT (GAS MODELS ONLY)
A hi-limit thermostat is located at the burner. This is an automatic
reset disc-type thermostat set at 330º F (166º C). If the flame in
the burner should get too hot, this thermostat will shut off the
burner. This is generally caused by low airflow through the dryer.
O. AUTOMA TIC RESET THERMOSTAT
This is located inside the dryer in the lint compartment above the
lint drawer. This thermostat senses the heated air after it has
passed through the basket (tumbler). If the air temperature gets
too hot, the thermostat will shut off the burner. The dryer will not
run until the air temperature cools down. At this time, the
thermostat will reset. Basket (tumbler) and blower will run, but
dryer will not heat.
P. LINT DRAWER
The lint drawer is a pullout type and is located at the bottom of
the dryer in the lint compartment. Simply grab the lint drawer
handle, slide out the drawer, brush off the lint, and slide the
drawer back in. The lint screen must be kept clean in order
for the dryer to operate properly and efficiently.
15
Q. LINT DRAWER SWITCH
The lint drawer switch is located in the lint compartment and attached
to the side of the lint drawer track. The lint drawer switch insures that
the dryer will operate only when the lint drawer is completely closed.
This is a safety device and should never be disabled.
R. STEAM DAMPER SYSTEM
The newest type system is called the steam damper. It is
shown to the right and it uses a piston with compressed air to
open and close the steam damper, which in turn allows the air
to flow either through the coil for heat, or under the coil for
cool down. Air supply is 80 PSI +/- 10 PSI (5.51 bars +/- 0.68
bars).
S. COMPRESSED AIR REQUIREMENTS
The dryer requires an external supply of air (2.5 cfm @ 80
PSI [0.07 cmm @ 0.68 bars]) on the steam models, the air is
necessary to operate the damper system. On both steam, as
well as the gas model, the air is necessary/required for the
blower air jet operation...to clean lint from the impellor/fan
(squirrel cage type).
T. TEMPERATURE SENSOR BRACKET (NONCOMPUTER)
The noncomputer temperature sensor bracket consists of four
(4) thermostats. Three (3) of them are the certain temperatures
that the dryer should cycle on and off at. The fourth one (1) is
the 225º F (107º C), safety basket (tumbler) hi-limit that should
only react when it sensors an over heat condition exceeding
225º F (107 º C).
Loading...