Dexter Laundry T-30 User manual

8514-291-001 REV PR PAGE 1
– Ne pas entreposer ni utiliser d’essence ni
d’autres apeurs ou liquides inflammables dans
le oisinage de cet appareil ou de tout autre
appareil.
– QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareil.
• Ne touchez à aucun interrupteur. Ne pas
ous ser ir des téléphones se trou ant
dans le bâtiment où ous trou ez.
• É acuez la pièce, le bâtiment ou la zone.
• Appelez immédiatement otre fournisseur
de gaz depuis un oisin. Sui ez les
instructions du fournisseur.
• Si ous ne pou ez rejoindre le fournisseur
de gaz, appelez le ser ice des incendies.
– L’installation et l’entretien doi ent être assures
par un installateur ou un ser ice d’entretien
qualifie ou par le fournisseur de gaz.
INDUSTRIAL DRYERS
MODEL T-30/50/80/120 ON-PREMISE
O-SERIES CONTROL, NATURAL GAS/LP HEATED
OPERATOR’S MANUAL
INSTALLATION & OPERATION INSTRUCTIONS
The ryer must not be store or installe where it will be expose to water an /or weather.
Post the following “For Your Safety” caution in a
prominent location:
It is important that you read this Manual and retain it
for future reference. For ser ice or replacement parts,
contact the distributor in your area or the manufacturer.
Dexter Laun ry Inc.
2211 West Grimes A enue
Fairfield, Iowa 52556
AVERTISSEMENT
:
Assurez
-
vouz
e bien suivre les instructions
onnées ans cette notice pour
ré uire au minimum le risque
’incen ie ou ’explosion ou pour
éviter tout ommage matérial,
toute blessure
ou la mort.
– Do not store or use gasoline or other
flammable apors and liquids in the icinity 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 phone in your building.
• Clear the room, building or area of all
occupants.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call
the fire department.
– Installation and ser ice must be performed by
a qualified installer, ser ice agency or the gas
supplier.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings
exactly coul result in serious injury,
eath or property amage.
POUR VOTRE SÉCURITÉ
Ne pas ente poser ni utiliser d’essence ni d’autres
apeurs ou liquides inflammables dans le oisinage
de cet appareil ou de tout autre appareil.
You, the purchaser, must post in a prominent loca-
tion instructions to be followed in the e ent the user
smells gas. Consult your local gas supplier for pro-
cedure to be followed if the odor of gas is present.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
apors or liquids in the icinity of this or any
other appliance.

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TABLE OF CONTENTS
1 WARNINGS ABOUT USE AND OPERATION ..................................................................... 3
2 DRYER SPECIFICATION SHEET ..................................................................................... 4
3 T-30 DRYER DIMENSIONS ............................................................................................ 5
4 T-50 REVERSING DRYER DIMENSIONS .......................................................................... 8
5 T-80 REVERSING DRYER DIMENSIONS ........................................................................ 11
6 T-120 REVERSING DRYER DIMENSIONS ...................................................................... 14
7 INSTALLATION INSTRUCTIONS .................................................................................. 17
7.1 UNCRATING ......................................................................................................... 17
7.2 DRYER INSTALLATION .......................................................................................... 17
7.2.1 CODE CONFORMITY ....................................................................................... 17
7.2.2 INSTALLATION CLEARANCES .......................................................................... 17
7.2.3 MAKE-UP AIR ................................................................................................. 18
7.2.4 ELECTRICAL REQUIREMENTS .......................................................................... 18
7.2.5 IMPORTANT: TRANSIENT VOLTAGE SURGE SUPPRESSORS .............................. 18
7.2.6 GAS REQUIREMENTS ...................................................................................... 19
7.2.7 EXHAUST INSTALLATION ................................................................................ 20
7.3 DRYER IGNITION (SOLID STATE IGNITION) .......................................................... 20
7.4 DRYER SHUTDOWN .............................................................................................. 21
8 OPERATING INSTRUCTIONS ....................................................................................... 21
8.1 STARTING THE DRYER ......................................................................................... 21
8.2 END OF CYCLE ..................................................................................................... 22
9 PROGRAMMING / MANAGEMENT VIEW ....................................................................... 22
10 AUTODRY CYCLES ...................................................................................................... 22
11 OVERHEAT SENSING .................................................................................................. 22
12 DRYER ERROR MESSAGES .......................................................................................... 23
13 SERVICING THE DRYER .............................................................................................. 29
14 PREVENTIVE MAINTENANCE INSTRUCTIONS............................................................... 30

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1 WARNINGS ABOUT USE AND OPERATION
It is ABSOLUTELY ESSENTIAL that the dryer be grounded to a known earth (zero) ground. This is not only
for personal safety, but is necessary for proper operation.
DO NOT MODIFY THIS APPLIANCE. KEEP SHIELDS, GUARDS, AND COVERS IN PLACE. These
safety de ices are pro ided to protect e eryone from injury.
THIS DRYER IS EQUIPPED WITH AN OVER-TEMPERATURE THERMOSTAT located to the right of the
motor on the rear of the cabinet. If the dryer cease to operate, refer to your “Ser ice Procedure and Parts Data”
book for instructions.
CHECK THIS THERMOSTAT WHEN INSTALLING THE DRYER to assure it is not tripped. Impacts such as
rough handling in shipment, may trip the thermostat.
DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE while in operation.
THIS APPLIANCE SHALL NOT BE USED TO DRY OFF CLOTHES CONTAINING SOLVENTS OR DRY
CLEANING FLUIDS.
A itional warning for ryer mo els with water ispensing systems:
WARNING: ELECTRICAL SHOCK HAZARD
Electrical shock can result in death or serious injury.
If the water dispensing system is acti ated do not attempt to
operate the dryer.
If the water dispensing system is acti ated ha e the dryer
inspected by a qualified agency before operating the dryer.

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2 DRYER SPECIFICATION SHEET
T
-
30
T
-
50
T
-
80
T
-
120
Capacity
Dry Weight Capacity
-
lb (kg)
30
(13.6)
50
(22.7)
80
(36.3)
120
(54.4)
Cylinder Volume
-
cu ft (L)
11.3
(320)
15.8
(447.4)
23
(651.3)
36.1
(1022.2)
Speed
Tumbler Speed
–
RPM
47
---
45
---
40
---
36.5
---
Motor Size
-
60 Hz
Standard
-
hp (kW)
0.5
(0.38)
---
---
---
---
---
Motor Size
-
50 Hz Standard
-
hp (kW)
0.5
(0.38)
---
---
---
---
---
Motor Size
-
60 Hz Re ersing
-
hp (kW)
---
2 & 0.5
(1.5 & 0.38)
1 & 0.75
(0.75 & 0.56)
1 & 1
(0.75 & 0.75)
Motor Size
-
50 Hz
Re ersing
-
hp (kW)
---
---
1 & 0.75
(0.75 & 0.56)
1 & 0.75
(0.75 & 0.56)
Airflow
60 Hz Model
-
8" Outlet
-
cfm (M3/min)
830
(23.5)
910
(25.8)
1200
(34)
60 Hz Model
-
10" / 12" Outlet
-
cfm (M3/min)
---
---
---
1250 / 1450
(35.4 / 41.4)
50 Hz Model
-
8" Outlet
-
cfm (M3/min)
690
(19.5)
760
(21.5)
1000
(28.3)
---
50 Hz Model
-
10" / 12" Outlet
-
cfm (M3/min)
---
---
---
1000
28.3
Dimensions
Cabinet Height
-
in (cm)
72 1/4
(183.5)
72 1/4
(183.5)
75 3/4
(192.4)
85 5/16
(216.7)
Cabinet Width
-
in (cm)
31 1/2
(80)
34 1/2
(87.6)
38 1/2
(97.8)
46 3/4
(188.7)
Cabinet Depth
-
in (cm)
41 3/4
(106)
48
(121.9)
51 3/4
(131.4)
---
Cabinet Depth
-
Re ersing
-
in (cm)
---
50
(127)
51 3/4
(131.4)
60 3/16
(152.9)
Door
Opening
-
in (cm)
22 5/8
(57.5)
25 5/8
(65.1)
25 5/8
(65.1)
25 5/8
(65.1)
Floor to Door Bottom
-
in (cm)
28 3/4
(73)
27 1/4
(69.2)
29 1/4
(74.3)
37
(94)
Cylinder Diameter
-
in (cm)
30
(76.2)
32 1/2
(82.6)
36 1/2
(92.7)
43
(109.2)
Cylinder Depth
-
in (cm)
27 1/2
(69.9)
33
(83.8)
38
(96.5)
43
(109.2)
Lint Screen Area
-
sq in (sq cm)
515
(3323)
708
(4568)
823
(5310)
862
(5561)
Weight
Net Weight
-
lb (kg)
454
(205.9)
540
(244.9)
715
(324.3)
---
Net Weight
-
Re ersing
-
lb (kg)
---
560
(254)
715
(324.3)
1075
(487.6)
Shipping
Shipping Weight
-
lb (kg)
499
(226.3)
590
(267.6)
770
(349.3)
---
Shipping Weight
-
Re ersing
-
lb (kg)
---
620
(281.2)
770
(349.3)
1122
(508.9)
Shipping Height
-
in (cm)
77 1/4
(196.2)
77 1/4
(196.2)
80 3/4
(205.1)
88 3/8
(224.5)
Shipping Width
-
in (cm)
32 3/4
(83.2)
36
(91.4)
40 1/4
(102.2)
48 1/4
(122.6)
Shipping Depth
-
in (cm)
45 1/2
(115.6)
51 1/2
(130.8)
55 1/2
(141)
---
Shipping Depth
-
Re ersing
-
in (cm)
---
53 1/2
(135.9)
55
1/2
(141)
68 1/2
(174)
Gas (Gas Models Only)
Gas Supply Connection
-
in (mm)
1/2
(12.7)
1/2
(12.7)
3/4
(19.1)
3/4
(19.1)
Natural Gas Supply (Water Column)
-
in (cm)
5
-
10
(12.7
-
25.4)
5
-
10
(12.7
-
25.4)
5
-
10
(12.7
-
25.4)
5
-
10
(12.7
-
25.4)
Natural Gas Burner Manifold Pressure (Water Column)
60Hz Model - in (cm)
3.5
8.89
3.5
8.89
3.5
8.89
3.5
8.89
Natural Gas Burner Manifold Pressure (Water Column)
50Hz Model - in (cm)
3.4
8.64
3.5
8.89
3.5
8.89
3.5
8.89
LP Gas Supply (Water Column)
-
in (cm)
11 1/2
-
13 1/2
(29.2
-
34.3)
11 1/2
-
13 1/2
(29.2
-
34.3)
11 1/2
-
13 1/2
(29.2
-
34.3)
11 1/2
-
13 1/2
(29.2
-
34.3)
LP Gas Burner Manifold Pressure (Water Column)
60Hz Model - in (cm)
11
27.9
11
27.9
11
27.9
11
27.9
LP Gas Burner
Manifold Pressure (Water Column)
50Hz Model - in (cm)
10
25.4
11
27.9
11
27.9
11
27.9
Gas Usage
-
60Hz Model
-
BTU/hr (kW)
90,000
(26.4)
145,000
(42.5)
215,000
(63)
320,000
(93.8)
Gas Usage
-
50Hz Model
-
BTU/hr (kW)
74,000
(21.7)
120,000
(35.2)
195,000
(57.1)
300,000
(87.9)
Electrical
Gas Models
Volts / Hz / Phase / Wiring
Circuit Breaker Amps / Running Amps / Wire Size
-
11
208
-
240 / 60 / 1 / 2 wire + ground
---
15 / 5.1 / #12
15 / 5.5 / #12
20 / 10 / #12
-
15
208
-
240 / 60 / 1 /
2 wire + ground
15 / 5.1 / #12
---
---
---
120 / 60 / 1 / 2 wire + ground
15 / 9.6 / #12
---
---
---
-
39
230 / 50 / 1 / 2 wire + ground
10 / 5.1 / 2.1 mm2
10 / 5.1 / 2.1 mm2
10 / 5.2 / 2.1 mm2
20 / 9.8 / 3.5 mm2
-
59
230 / 50 / 1 / 2 wire +
ground
10 / 5.1 / 2.1 mm2
10 / 5.1 / 2.1 mm2
10 / 5.2 / 2.1 mm2
---
Installation
Minimum Clearance Between Machines
-
in (cm)
0
0
0
(0)
0
(0)
0
(0)
Minimum Clearance Behind Machines
-
in (cm)
18
(45.7)
18
(45.7)
18
(45.7)
18
(45.7)
Make
-
Up Air Required
-
sq ft (sq cm)
1
(929)
1.25
(1161)
1.5
(1394)
2.25
(2090)
Exhaust Size
-
in (cm)
8
(20.3)
8
(20.3)
8
(20.3)
10 or 12
(25.4 or
30.5)
Max. Exhaust Back Pressure (Water Column)
-
in (mm)
0.3
(7.6)
0.3
(7.6)
0.3
(7.6)
0.3
(7.6)
Recommended Exhaust Length
-
ft (m) & 2 elbows
14
(4.3)
14
(4.3)
14
(4.3)
14
(4.3)

8514-291-001 REV PR PAGE 5
3 T-30 DRYER DIMENSIONS
T-30 DRYER DIMENSIONS – FRONT VIEW

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T-30 – DRYER DIMENSIONS – SIDE VIEW

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T-30 – DRYER DIMENSIONS – TOP VIEW

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4 T-50 REVERSING DRYER DIMENSIONS
T-50 REVERSING DRYER DIMENSIONS – FRONT VIEW

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T-50 REVERSING DRYER DIMENSIONS- SIDE VIEW

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T-50 REVERSING DRYER DIMENSIONS - TOP VIEW

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5 T-80 REVERSING DRYER DIMENSIONS
T-80 REVERSING DRYER DIMENSIONS – FRONT VIEW

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T-80 REVERSING DRYER DIMENSIONS – SIDE VIEW

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T-80 REVERSING DRYER DIMENSIONS – TOP VIEW

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6 T-120 REVERSING DRYER DIMENSIONS
T-120 REVERSING DRYER DIMENSIONS – FRONT VIEW

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T-120 REVERSING DRYER DIMENSIONS – SIDE VIEW

8514-291-001 REV PR PAGE 16
T-120 REVERSING DRYER DIMENSIONS – TOP VIEW

8514-291-001 REV PR PAGE 17
7 INSTALLATION INSTRUCTIONS
7.1 UNCRATING
Tools required: 3/4” hex socket and ratchet dri er, knife, channel-lock wrench that opens to 1 3/8".
1. Remo e the plastic wrap with knife. Remo e cardboard rails, fillers and top cap.
2. Using a ratchet and a 3/4” socket, remo e the (4) bolts attaching the wooden skid to the dryer cabinet. Sa e
the bolts for future mo ing of the dryer.
3. With a walking motion, mo e the dryer forward completely off the wooden skid. Sa e the skid for future
mo ing of the dryer.
4. T-30/50/80: Using the channel-lock wrench, adjust the le eling legs to align the machine with adjacent units.
The T-120 requires shimming to le el the dryer.
Note: If the dryer is e er mo ed again, the dryer should be re-mounted on its pallet and its crating bolts re-
inserted and tightened, in the re erse order as abo e.
7.2 DRYER INSTALLATION
7.2.1 CODE CONFORMITY
All commercial dryer installations must conform with local codes or, in the absence of local codes, with
the latest edition of the National Fuel Gas Code ANSI Z223.1A. Canadian installations must comply with
current Standard CAN/CGA-B149 (.1 or .2) Installation Code for Gas Burning Appliances or Equipment, and
local codes if applicable. Australian installations must meet installation requirements and pipe sizing
requirements of AS/NZA 5601. The appliance, when installed, must be electrically grounded in
accordance with the latest edition of the National Electrical Code, ANSI/NFPA70, or, when installed in
Canada, with Standard CSA C22.1 Canadian Electrical Code Part 1.
To connect the dryer to the supply piping, use a listed connector in compliance with the Standard for
Connectors for Gas Appliances, ANSI Z21.24 • CSA 6.10.
7.2.2 INSTALLATION CLEARANCES
This unit may be installed at the following alco e clearance. (millimeters)
I. Left Side 0”
II. Right Side 0” *
III. Back 18” (457) (Certified for 1” (25) clearance; howe er, 18” (457) clearance is necessary behind
the belt guard to allow ser icing and maintenance.)
IV. Front 48” (1220) (to allow use of dryer)
V. Top Refer to figure on the next page labeled “Vertical Clearance Dimensions”.
Certification allows 0” clearance at the top 1” (25) back from the front. Howe er, a 1/4” (6)
clearance is required to allow opening the upper ser ice door.
A 10” (254) clearance is required from the top at all other points.
VI. Floor This unit may be installed upon a combustible floor.
*Units may be installed in direct contact with an adjacent dryer, pro iding allowance is made for opening
upper and lower ser ice doors.

8514-291-001 REV PR PAGE 18
Do not obstruct the flow of combustion and entilation air.
Maintain minimum of 1” (25) clearance between duct and combustible material.
Refer to installation label attached to the rear guard of the dryer for other installation information.
VERTICAL CLEARANCE DIMENSIONS - TYPICAL
7.2.3 MAKE-UP AIR
Adequate make-up air must be supplied to replace air exhausted by dryers on all types of installations. Refer to
specifications for the minimum amount of make-up air opening to outside for each dryer. This is a net requirement of
effecti e area. Screens, grills or lou ers, which will restrict the flow of air, must be considered. Consult the supplier to
determine the free area equi alent for the grill being used. The source of make-up air should be located sufficiently
away from the dryers to allow an e en airflow to the air intakes of all dryers. Multiple openings should be
pro ided.
The sources of all make-up air and room entilation air mo ement to all dryers must be located away from any
dry cleaners. This is necessary so that sol ent apors will not be drawn into the dryer inlet ducts. Dry cleaner
sol ent apors will decompose in contact with open flame such as the gas flame present in clothes dryers. The
decomposition products are highly corrosi e and will cause damage to the dryer(s) ducts and clothes loads.
7.2.4 ELECTRICAL REQUIREMENTS
The electrical power requirements necessary to operate the unit satisfactorily are listed on the serial plate located on
the back panel of each dryer and in the specifications section of this manual. The electrical connection should be
made to the terminal board, on the rear of the unit. It is absolutely necessary that the dryer be grounded to a
known ground. Indi idual circuit breakers for each dryer are required.
Indi idual circuit breakers for each unit are recommended. Do not use ground-fault circuit breakers or ground-
fault circuit interrupter outlets. The wiring diagram is located on the belt guard on the back of the machine.
7.2.5 IMPORTANT: TRANSIENT VOLTAGE SURGE SUPPRESSORS
Like most electrical equipment, your new machine can be damaged or ha e its life shortened by oltage surges
due to lightning strikes which are not co ered by factory warranty. Local power distribution problems also can

8514-291-001 REV PR PAGE 19
be detrimental to the life of electrical components. We recommend the installation of transient oltage surge
suppressors for your new equipment. These de ices may be placed at the power supply panel for the complete
installation and don’t require an indi idual de ice 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 o erall life of electrical components of
all types and cause their failure at a later date. Although they can’t protect against all e ents, these protecti e
de ices ha e a good reputation for significantly lengthening the useful life of electronic components. Electronic
components are helped to ha e a longer useful life when they are supplied with the clean stable electrical power
they like.
We are including the following names and phone numbers of a few suppliers of these de ices for those who don’t
currently ha e a source.
MANUFACTURER CONTACT PHONE
Inno ati e Technology, Inc Distributor 1-800-809-2772 or
(Part of Eaton Corporation) www.it ss.com
EFI Electronics Corporation Factory 1-800-877-1174
(Part of Schneider Electric)
MCG Surge Protection Factory 1-800-851-1508 or
www.mcgsurge.com
Ad anced Protection Factory 1-800-237-4567 or
Technologies Inc. www.aptsurge.com
7.2.6 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.
An indi idual gas shutoff al e is recommended for each dryer and may be required by local code (not supplied).
The inlet gas connection to the unit is 1/2 inch [12.7] pipe thread for T-30/50 and 3/4 inch [19.1] for the T-80/T-
120.
A joint compound resistant to the action of liquefied petroleum gases should be employed in making pipe
connections.
A 1/8 inch NPT plugged tapping, accessible for test gage connection, must be installed immediately upstream of
the gas supply connection to the dryer.
A drip tee should be pro ided in the gas piping entering the unit to catch dirt and other foreign articles.
All pipe connections should be checked for leakage with soap solution. Ne er check with an open flame.
The recommended natural gas supply pressure is 7 inches water column (17.8 cm) at each dryer.
With the burners in operation, check the gas pressure at the threaded port in the end of the burner manifold.
Adjust the dryer’s gas control al e for 3.5 inches water column (8.89 cm w.c.) pressure at the manifold (Adjust
T-30 -39 models to 3.4 in. w.c. (8.64 cm w.c.)).
For altitudes abo e 2,000 feet (610m) it is necessary to de-rate the BTU input. Contact your local distributor for
instructions.
L.P. gas con ersion kits are a ailable for this dryer. Contact your local distributor.
CAUTION: The dryer must be disconnected from the gas supply piping system during any pressure testing of
that system. Do not expose the dryer’s gas control al e to testing pressure.

8514-291-001 REV PR PAGE 20
7.2.7 EXHAUST INSTALLATION
Exhausting of the dryer(s) should be planned and constructed so that no air restrictions occur. Any restriction due
to pipe size or type of installation can cause slow drying time, excessi e 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.
Indi idual exhausting of the dryers is recommended. All heat, moisture, and lint should be exhausted outside by
attaching a pipe of the proper diameter to the dryer adapter collar and extending it out through an outside wall.
This pipe must be ery smooth on the inside, as rough surfaces tend to collect lint which will e entually clog the
duct and pre ent 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' (4.3m) of straight (8”
(20.3cm) for T-30/50/80, 10 or 12” (25.4 or 30.5cm) for T-120) diameter pipe be used with two right angle
elbows. When more than two elbows are used, 2' (61cm) of straight pipe should be remo ed 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 slee e of slightly larger diameter should be set in the wall and
the exhaust pipe passed through this slee e. This practice is required by some local codes and is recommended in
all cases to protect the wall. This type of installation should ha e a means pro ided to pre ent 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 pre ent entrance of wind and rain. In
either case, the outlet should be kept clear, by at least 24” (610), of any objects which would cause an air
restriction.
Ne er install a protecti e screen o er the exhaust outlet.
When exhausting a dryer straight up through a roof, the o erall 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” o er the pipe is suitable for this application.
Exhausting the dryer into a chimney or under a building is not permitted. In either case there is a danger of lint
build-up which can be highly combustible.
Installation of se eral dryers, where a main discharge duct is necessary, will need the following considerations for
installation. Indi idual ducts from the dryers into the main discharge duct should be at a 45 degree angle in the
direction of discharge air flow.
NOTE: Ne er install the indi idual ducts at a right angle into the main discharge duct. The indi idual
ducts from the dryers can enter at the sides or bottom of the main discharge duct. The main duct can be
rectangular or round, pro ided adequate air flow is maintained. For each indi idual dryer, the total exhausting
(main discharge duct plus duct outlet from the dryer) should not exceed the equi alent of 14 feet (4.3m)
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 elocity – both
contributing to lint build up. An inspection door should be pro ided 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.
7.3 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- al e relay (in the electronic controller) calls for heat. The procedure for first-time starting of a dryer is as
follows: