GE DCB330EY, DCD330EY, DCB330GY, DCD330GY Technical Service Manual

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GE Consumer Service Training

TECHNICAL SERVICE GUIDE

COMMERCIAL DRYERS

Commerical Dryer

PERMAMENT PRESSPERMAMENT PRESS

SYNTHETIC KNITSSYNTHETIC KNITS

ASH

T W

HEA

COTTONS

T WITHT WITH

HIGH HEAHIGH HEA
COOL DOWN CYCLECOOL DOWN CYCLE

T

LOW HEALOW HEA

RESUME HEARESUME HEA

ART

PRESS TO STPRESS TO ST

TINGTING

OPERA

Add coins for extra dry time.Add coins for extra dry time.

1.
If dryer door is opened duringIf dryer door is opened during

2.

ART
cycle, push PRESS TO STcycle, push PRESS TO ST
button again to resume cycle.button again to resume cycle.

T

MODEL SERIES:
DCB330EY (Electric)
DCD330EY

DCB330GY (Gas)
DCD330GY

PUB # 31-9041 12/99

Table of Contents

Model Series Features

Countdown (DCD Models)

Dimensions/Rating Plate

Installation Highlights

Top Panel/Front Panel

Lower Drum Seal

Drum Removal

Drum Shaft and Bearing
Dryer Controls

Timer/Accumulator

Door Switch

2
3-4

5
6-7

8

9
10
10

11

11

12

Control/Bias Thermostat

High Limit/Thermal Limit

Belt Switch

Motor

Motor Removal

Motor Harness/Wiring

Wiring Diagrams

Troubleshooting Flowcharts

Exploded Views/Parts List

12
13
14

15
16

16

17-18
19-21

22-41

1

2

3

COUNTDOWN DISPLAY DIAGNOSTICS

To verify correct operation of Countdown
Display Board:

1. Make sure power is ON to dryer.

2. Advance coin box timer one cycle.

3. The display should read “88” for two to
three seconds, then default to the dip s witch
settings. (factory setting is “45”).

4. At the same time the “88” displa y is shown
the four indicator LED’s should light for 2-3
seconds. Next the “Press Start” LED will b link
and other indicator lights will go off. (if dryer
door is NOT open)

5. Replace the board if LED’s and Display
do not function as described in #3 and #4
above.

NOTE: The boar d does not control any cyc le
time duration of the dryer. The dryer will
function normally if there is a complete
failure of the board. It is the owners’
discretion whether or not the board should
be replaced.

To replace Countback Display PC Board:

WARNING! THE STEP DOWN CAPACITOR

ON PC BOARD IS 120 VOLTS, AND POWER
MUST BE REMOVED PRIOR TO SERVICING.
THE TRACES ON THE BOARD R UNNING TO

THE CAPACITOR ARE HOT!

1. Remove the four screws in the top of
the control panel.

2. Disconnect harness connector to PC
board.

3. Pull 6 tabs as shown in illustration, one
at a time, starting at connector end,
while applying slight upward pressure,
until all tabs are released. Remove
PCboard.

4. With PCboard cover exposed, lift up on
either end of cover and release the
four tabs, one at a time until the cover
is release and remove.

5. To reinstall, align the PC board cover,
and press carefully. The tabs are
beveled to make installation easy.

6. Align PC board, by inserting the
counter end under the tab in plastic
pcboard cover at the counter opening,
and moving towards the connector
end, carefully press into place, so that
each tab snaps into place. Reconnect
harness connector, and reinstall.
control panel and four screws.

4

PERMAMENT PRESS

HIGH HEA

T WITH
COOL DOWN CYCLE

LOW HEA

RESUME HEA

1.

2.

Add coins for extra dry time.
If dryer door is opened during
cycle, push PRESS TO ST

ART

button again to resume cycle.

SYNTHETIC KNITS

PRESS TO ST

ART

OPERA

TING

COTTONS

HEA

T W

ASH

CABINET DIMENSIONS

DRYER CABINET DIMENSIONS

42"

36"

25-1/2"

Commerical Dryer

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Rating Plate with
Model/Serial Number

5

6

NOTE: When exhausting from the side or bottom, a vent kit is available as publication
#14-A018. The vent kit replaces the existing duct inside the dryer to allow a 90° elbow
to vent the dryer out the side or bottom. The kit consists of a 6 1/2” long, 4” diameter
metal duct with attached mounted bracket and instructions. A 90° elbow is not supplied
and must be provided by the installer.

7

DRYER OPERATION

PERMAMENT PRESS

HIGH HEA

T WITH

COOL DOWN CYCLE

LOW HEA

RESUME HEA

1.

2.

Add coins for extra dry time.
If dryer door is opened during
cycle, push PRESS TO ST

ART

button again to resume cycle.

SYNTHETIC KNITS

PRESS TO ST

ART

OPERA

TING

COTTONS

HEA

T W

ASH

The dryer drum rotates clockwise at 48 – 54 rpm
as viewed from front. On electric models, air is
drawn into the heater housing and across the
open coils of the electric heater. On gas models,
air is drawn into the combustion chamber and over
the burner flame. The air is then pulled through
the tumbling clothes, picking up moisture and lint.
Lint is filtered out as air passes from the drum,
across the filter screen and into the blower duct,
where it is discharged out the vent. The bias
control thermostat, according to the setting of the
fabric selector switch, controls the air temperature.
The length of the drying cycle is controlled by the
number of minutes selected on the timer or auto­matically controlled by the timer, in conjunction
with the thermostat, for the type of fabric selected

(automatic dry cycles).

ACCESSING THE DRYER COMPONENTS

Top Panel Removal

The top panel is held in place by two spring clips
located at the front of the dryer and two tabs located

at the back. To release the clips, use a stiff putty
knife inserted between the top and front panel at
the locations shown at right. Holding the putty knif e
in a horizontal position, push in on one spring clip to
release that edge of the top. Repeat with the other
clip, lift the top at the front and disengage it from the
tabs at the rear.

2 Phillips screws

Starting at the top edge, pull the front panel forward.
3 guide clips align the front panel to the sides. Once
the clips are released, lift the front panel to remove.

Guide Clips

Commerical Dryer

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Front Panel Removal

The remove the front panel, disconnect power and
remove the top panel. Once the top panel is off,
remove the two Phillips screws, one on each side,
located on the top inside edge of the front panel.
Disconnect the two wires from the door switch.

Air Duct

Air Duct Seal

Front Panel Air Duct

The front panel air duct is glued to the front panel.
Should the air duct need to be replaced, an air duct
seal will also be required. The foam air duct seal is
gluded to the air duct and seals between the duct
and the opening for the blo wer wheel on the blo wer
housing. To replace the air duct or install a replace­ment front panel, remove the front panel, remove
the lint filter, remove the 2 Phillips screws from the
lint trap cover and remov e the lint tr ap cov er . Using
a sharp knife, cut the adhesive between the air duct
and the front panel. If reinstalling the or iginal front
panel, use a putty knife to remove as much of the
old adhesive as possible. Apply adhesive along the

edge of the air duct and position it on the front panel.

8

Apply a bead of WH60X20 adhesive on the air duct
seal and position it on the air duct. Reinstall the lint
trap cover and filter, front and top panel.

Door Gasket

The door gasket is secured to the door panel by
tabs. To replace the gasket, pull the old gasket off
the inner door panel, align the new gasket tabs with

the slots in the door and press the gasket into place.

Door Handle

The door handle is secured to the outer door panel
by tabs. To replace the door handle, remove the
door from the front panel and remove the screws
from the sides and bottom of the door. Separate
the inner and outer door panels. Release the tabs
that secure the door handle to the front panel.

Rear Access Panel

The rear access panel allows access to view the
motor, centrifugal s witch, idler pulley assembly, belt
and belt switch. The panel is secured to the back b y
two Phillips screws.

Mini Manual

Heat Deflector Shield

Drum Glide and Upper Seal

The drum glide is glued to the top outer edge of the
door opening and is a part of the felt upper drum
seal. To replace the drum glide/upper seal assembly ,
raise the top panel, remove the two Phillips screws
on the front panel and pull the front panel towards
you. Remove the old seal assembly and glue the
new seal in place using WH60X20 adhesive.
Reinstall the front and the top panels.

Drum Glide and Upper Seal

Rear Access Panel

NOTE: Located on the rear of the dryer is a heat
deflector shield. The purpose of the shield is to
prevent someone from coming in contact with the
hot part of the cabinet near the heater. If y ou remove
the shield for any reason, make cer tain to reinstall
the shield upon dryer reassembly.

Lower Drum Seal

The lower drum seal is glued in place around the
outer lower edge of the door opening on the front
panel. To replace the lower seal, remove the top
panel and the front panel. Remo ve the old seal and
glue a new seal in place. Reinstall the front and top
panels.

9

Dryer Drum Removal

Drum Bearing

To remove the dryer drum, disconnect power and
remove the top and front panels. Next, remove the
yellow spacer/bumper attached to the top cross
brace by a Phillips screw.

Drum Spacer/Bumper

Remove the drive belt from the motor drive pulley
by reaching under the drum from the front or through
the rear access opening. Once the belt is loose , the
drum must be lifted
straight up to disengage
the drum shaft from the
drum bearing. Once the
shaft ball is above the
drum bearing cup, pull the
drum forward through the
cabinet opening.

The drum bearing mounts to the inside rear of the
dryer cabinet by means of a sheet metal bracket
secured by two 5/16” screws. To replace, remove
the two screws holding the bearing to the back of
the dryer. Note: A small steel ball is used to provide
a grounding path. Make certain the steel ball is
installed during reassembly. Thoroughly lubricate
the new bearing with lithium grease and reassemble.

Drum Shaft

The drum shaft is attached to the drum by three
Torx screws. To replace the dr um shaft, align the
mounting holes and use a piece of tape to hold the
shaft in place while installing the Torx screws from
inside the drum. Thoroughly lubricate the shaft ball
with Lubriplate or a high quality lithium grease.

Drum V anes

All three dryer drum vanes are replaceable. Each
vane is attached to the drum by two Phillips screws.

NOTE: If necessary , the drum shaft and bearing are
available as a kit under the part# WE25X10001. The
kit contains the drum shaft, shaft bearing, mounting
brackets , a steel ball, screws and a tube of Lubriplate,
a high quality lithium grease.

10

Dryer Controls

PERMAMENT PRESS

HIGH HEA

T WITH

COOL DOWN CYCLE

LOW HEA

RESUME HEA

1.

2.

Add coins for extra dry time.
If dryer door is opened during
cycle, push PRESS TO ST

ART

button again to resume cycle.

SYNTHETIC KNITS

PRESS TO ST

ART

OPERA

TING

COTTONS

HEA

T W

ASH

To access the dryer controls, disconnect power and
remove the four Phillips screws at the top of the
switch trim, remove the screws and the switch trim
adapter (shown in illustration below). Grasp the trim
at the top and pull forward. Three tabs at the bottom
fit into slots on the top panel.

Commerical Dryer

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cycle, push PR

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gain to resum

button a

Timer

The timer is an electromechanical control with a 115v
drive motor. On a timed cycle, the timer motor
receives 115 volts continuously for the number of
minutes selected for the cycle. The timer/
accumulator assembly consist of a mounting brac ket,
timing motor, snap s witch, timing cam, drive (timing
cams) coil spring(pawl), torsion spring (rachet asm),
amd coil spring (index lever). The timing motor is
115V-60HZ, and runs at 1/180 R.P.M. It is shipped
from the factory with a 45 minute cycle time. This
can be changed by ordering a different motor.
(specify voltage, frequency, and speed.) from
Greenwald Industries. See sample par ts catalog
pages for timer section for full address.

Timer/Accumulator

Torsion Spring
(Ratchet Asm)

Coil Spring
(pawl)

Coil
Spring
(Index­Lever)

Mounting
Bracket

Timing Motor

Temperature Selector Switch

The temperature selector switch, allows the
customer to select different temperature settings f or
drying. The switch contains a 3K ohm resistor on
the electric model and a 2.4K ohm resistor on the
gas model. On the “Medium” setting, the selector
switch activates a control thermostat bias heater,
which is in series with the resistor on the switch. To
check the switch, disconnect power, remove the
wires from the switch and check f or continuity. With
the switch set on
“Regular” setting, there
should be continuity
only between terminals
1 and 2. On the
“Medium” setting, there
should be continuity
only between terminals
3 and 4. On a “Fluff ”
setting, there should be no continuity between either
set of terminals.

Timing Cam

Greenwald Industries, Inc.
1340 Metropolitan AVe.,
Brooklyn, N.Y 11237
Phone [phone]

Drive
(Timing Cams)

Enclosed Snap
Switch

11

Schematic Detail of Timer/Accumulator

Door Switch

The door switch is a normally open switch wired in
series with the drive motor. When the door is closed
and the motor running, a circuit is completed through
the motor’s run winding. To test the switch, remove
the top panel and wires from the switch. When the
door is closed, the switch should read continuity.
When the door is open, the switch should read open.
To replace the switch, squeeze the retaining clips
together and pull the switch from the front of the
dryer.

Control Thermostat and Bias Heater

The control thermostat regulates the temperature
inside the dryer drum. It is a single pole, single throw
switch wired in series with the high limit (or safety)
thermostat and the heat source. It is mounted on
the front of the blower housing. The control
thermostat also contains a bias heater. The purpose
of the bias heater is to apply a small amount of heat
to the control thermostat when the fabric selector
switch is set to the medium temperature setting. This
small amount of heat causes the thermostat to open
sooner to maintain a lower drum temperature.

Timer/Accumulator Bar Chart

T o diagnose the timer/accumulator , use the bar chart
located on the mini manual behind the switch trim.
Rotate the timer to a point in the particular cycle
you want to check. Find the appropriate location
the timer pointer is set in the cycles across the first
column. Read ver tically down the chart from that
point. At each point you cross a shaded row, the
contacts listed at the left on the same row should
have continuity. Note the shaded areas are
proportional to the total time, so take several
continuity measurements at different points within
the cycle before determining the timer motor needs
replacement. As you can see from the e xample of a
gas dryer above, the contacts are made most of the
cycle.

THERMOSTAT
TERMINALS

BIAS HEA TER
TERMINALS

NOTE:

The control thermostats are not interchangeable
between an electric and a gas dryer. The resistance
of the bias heater is 28K ohms on the electric dryer
and 7K ohms on the gas dryer.

12

To check the control thermostat, remove the wiring
from the terminals. At room temperature, the
thermostat should have continuity between the
control thermostat terminals. To check the bias
heater, remove the wiring from the bias heater
terminals. Check the resistance between the bias
heater terminals. On an electric dryer, the resistance
should be 28K ohms. On a gas dryer, the resistance
should be 7K ohms.

To check for correct dryer temperatures, make
certain all panels are in place on the dryer and
remove the e xhaust venting from the rear of the dryer.
Place a thermometer capable of reading at least
300°F in the end of the dryer duct. Set the timer
and allow the dryer to operate for 10 minutes with
an empty drum. Check the temper ature immediately
after the thermostat has cycled off and the dryer
has reached its highest temperature. Depending
upon the cycle selected, the temperatures should
be between 165°F-195°F on a “High” setting and
between 150°F-180°F for a “Medium” setting. If the
complaint is long drying times and the temperatures
are correct, check for a restricted vent, too long a
vent run, or an excessiv e number of turns in the vent.

High Limit (Safety) Thermostat

The high limit (safety) thermostat is a single pole,
single throw switch wired in series with the control
thermostat. It is mounted towards the top of the
heater pan shield at the rear of the drum. If the
control thermostat should fail closed or an air
blockage occurs, raising the temperature in the
heater pan, the high limit thermostat opens the circuit
to the heat source.

THERMAL
LIMITER

HIGH LIMIT
SAFETY
THERMOSTAT

Thermal Limiter

The thermal limiter is wired in series with the drive
motor on all electric dryers. The purpose of the
thermal limiter is to shut down the dryer should the
control thermostat and the high limit thermostat fail
to open. Once the ther mal limiter has opened, it
must be replaced. In addition, the condition that
caused it to open must be corrected. The most lik ely
cause would be a restriction in the dryer vent, an
excessively long v ent or a vent with excessiv e turns.
This is especially true if vinyl or plastic venting was
used.

Heat System (Electric Dryers)

The heater assembly is located behind the dryer
drum. Holes in the back of the drum allow heated
air to be drawn into the drum. The heating element
is an open coil heater, attached to a metal shroud

HIGH LIMIT
SAFETY
THERMOSTAT

HEATER

TERMINALS

13

by removing the drum and visually inspecting the
element for breaks. Remove the leads from the
heater terminals and check for 12 ohms across the
terminals, then check each terminal to ground. If
the element is open or grounded, replace the heating
assembly. To replace the heater assembly, remove
the four Phillips screws holding the assemb ly to the
cabinet back. Transfer the high limit (safety)
thermostat from the old heater shroud to the new
shroud and install the new assembly.

Heat System (Gas models)

Belt Switch

The belt switch is a normally closed switch and is
mounted on the motor bracket ne xt to the idler arm.
If the drive belt breaks or jumps off the idler pulley,
the idler arm will contact the belt switch, causing the
switch contacts to open, and thereby opening the
circuit to the motor. T o access the belt switch, remo ve
the access panel on the rear of the dryer. Remove
the leads from the switch and connect an ohmmeter
across the switch terminals. The ohmmeter should
read continuity when the belt is on.

The heating system for a gas dryer is comprised of
three main components, the ignitor, the flame sensor
switch, and the gas control valve.

The ignitor is a silicon carbide thermistor mounted
at an angle with the tip extending into the flame area.
Depending on room temperature, the resistance of
the ignitor should be between 50 to 400 ohms. The
ignitor is fragile and susceptible to contamination
from skin oils. Use only the ignitor’s insulated support
when handling to prevent damage . Electrically, the
ignitor is in parallel with the booster coil. The parallel
circuit of the ignitor and booster coil is in series with
the secondary coil on the gas valve. The series –
parallel circuit of the ignitor, booster coil, and
secondary coil is in tur n in parallel with the holding
coil on the gas valve. Note: During the auto dry
cycle, you will be able to read some voltage at the
ignitor whenever the dryer is operating.
The flame sensor switch mounts on the side of the
burner duct and is single pole, single throw switch.
When the ignitor reaches approximately 1800°, the
flame sensor switch detects this high radiant heat
and opens. This energizes the secondary solenoid
gas valve coil, allowing gas to flow through the gas
valve . Gas flowing into the b urner duct is ignited by
the still hot ignitor. The flame within the b urner duct
heats the air being drawn into the back of the drum.

IGNITOR

BURNER ASSEMBLY

CENTRIFUGAL SWITCH

BELT
SWITCH

Motor

The drive motor is a single speed, dual shaft, ¼ hp,
1725 rpm motor with an automatic reset overload
protector. The overload protector in an internal
component of the motor and cannot be replaced
separately. The motor shaft is threaded on one end
for the blo wer wheel, with the belt pulley on the other.
The pulley is not available separately and comes
pressed on the shaft of a new motor.

FLAME SENSOR

GAS V AL VE

14

The motor contains a centrifugal switch which serves
three purposes: It disengages the motor start
winding, engages the motor run winding and closes
the circuit for the heat source. When the motor is
off, the switch completes a circuit from M5 through
the motor start winding to M4. The contact M1 to
M2 is open. Immediately as the motor is started,
centrifugal force pulls the switch activating collar in
on the motor. This opens the circuit through the
start winding and completes the circuit M6 through
the run winding to M4. The contacts M1 to M2 close
to activate the heat source.

MOTOR OFF

tape, two Phillips screws and the six clips holding
the cover in place. Note the retaining clips under
the aluminum tape at the bottom edge of the cover.
When reassembling, make certain the cover is
sealed to the housing with aluminum tape. If the
original tape cannot be reused, use aluminum tape
WD49X27 to seal the cover.

Unscrew the blower wheel in a clockwise direction
from the motor shaft using a 7/8” sock et on the blower
wheel and holding the motor shaft by the pulley. The
clockwise direction is marked on the center of the
wheel.

MOTOR RUNNING

T o chec k the switch, disconnect the dryer from power
and remove the drum. If the motor starts to run and
stops when the start switch is released, place an
ohm meter across terminals M5 and M6 and
manually pull in on the collar to activate the switch.
You should read continuity. If the motor runs and
there is no heat, activate the switch and check
between M1 and M2. You should read continuity.

Motor Removal

T o replace the motor , disconnect power , remov e the
top and front panels, belt and dryer drum. Remov e
the fan cover by carefully removing the aluminum

Direction
of removal
marked on

the blower

wheel

7/8”

hex nut

Once the blower wheel is unscrewed, remove the
motor mounting clip and unplug the wiring harness
from the motor.

MOTOR

MOUNTING

CLIP

WIRING HARNESS

F AN COVER

15

Next, remove the fan housing lock from the rear of
the blower housing.

FAN

HOUSING

LOCK

To remove the lock, insert a flat bade screwdriver
as shown below . Pry the lock away from the housing
far enough to clear the retaining tab and lift the lock
out of the channel.

MOTOR AND HARNESS WIRING

(Motor remove for clarity in illustrations)

FAN

HOUSING

LOCK

RETAINING

TAB

Once the lock is removed, the motor can be pulled
from the blower housing.

16

Ω

Ω

17

18

Dryer Will Not Run

Service fuse,

breaker, outlet

problem

Repair terminal

block connection.

Replace door

switch

Replace start

switch

Electric Dryer

N

N

N

N

Adequate voltage

to dryer?

Y

Connections at

terminal block

OK?

Y

Door switch

contacts closed?

Y

Start switch

contacts closed?

Y

Service fuse,

breaker, outlet

problem

Replace door

switch

Replace start

switch

Replace timer
in coinbox

(Greenwald)

Gas Dryer

N

N

N

N

Adequate voltage

to dryer?

Y

Door switch

contacts closed?

Y

Start switch

contacts closing?

Y

Timer contacts

B & C closed?

Y

Replace timer

Replace thermal

limiter and

correct failure

fault

Replace belt

switch

Replace motor

N

N

N

N

Timer contacts

B & C closed?

Y

Contacts on

thermal limiter

closed?

Y

Belt switch

contacts closed?

Y

Check motor

centrifugal switch

reading between

contacts 4 & 5:

Or

Using a properly

grounded test

cord connected to

terminals 4 & 5
does the motor

run?

Y

Replace belt

switch

Replace motor

N

N

Belt switch

contacts closed?

Y

Check motor

centrifugal switch

reading between

contacts 4 & 5:

Or

Using a properly

grounded test

cord connected to

terminals 4 & 5
does the motor

run?

Y

Open wiring

between

components.

Locate and repair.

components.

Locate and repair

Open wiring

between

19

No Heat - Drum Turns

Electric Dryer

Service fuse,

breaker, wall

outlet problem

Replace power

cord

Replace timer

Greenwald

Replace

temperature

selector switch

Replace control

thermostat

N

N

N

N

N

Adequate voltage
to dryer at outlet?

Y

Correct voltage at

dryer terminal

block?

Y

Turn timer on

Contacts A & B

closed on the

timer?

Y

Contacts 1 & 2

closed on the

temperature

selector switch?

Y

Contacts on the

control thermostat

closed?

Not applicable

on all models

Replace hi limit

thermostat

Replace heater

Replace

motor

N

N

N

Open wiring

between

components.

Locate and repair

Y

Contacts on high

limit thermostat

closed?

Y

Heater resistance

OK?

Y

Continuity

between contacts

1 & 2 on

centrifugal

switch? Manually

move the switch
to run position to

check these

contacts

Y

20

No Heat - Drum Turns

Gas Dryer

Ignitor glowing?

N Y

Replace flame

sensor

Replace timer N

Greenwald

Replace

temperature

selector switch

Replace control

thermostat

Replace high limit

thermostat

N

contacts closed?

Contacts A & B

Contacts 1 & 2

N

selector switch?

Contacts on the

N

control thermostat

Contacts on the

N

Flame sensor

Y

closed on the

timer?

Y

closed on the

temperature

Y

closed?

Y

high limit

thermostat

closed?

Fix supply
problem

Ignitor between

50 and 400 ohms

at room

temperature?

Y

Flame sensor
contacts open

after ignitor has

been on 15 to 90

seconds max.?

Y

Gas valve

solenoids check

OK?

Y

120 volts to gas

valve solenoids?

N

Y

N

N

N

N

Gas supply OK

to dryer?

Replace ignitor

Replace flame

sensor

Replace gas

valve assembly

Open wiring in
gas valve circuit,
locate and repair

Replace

motor

Open wiring to

one of the

components.

Locate and repair.

N

Continuity

between contact

1 and 2 on the

centrifugal

switch?

Manuall move the

switch to the run

position to check

the contacts.

Y

Y

Y

Replace gas

valve assembly

Not applicable

on all models

21

For complete Illustrated
Parts Catalog information
consult your GE Parts
Catalog, or Microfiche.
These examples are for
illustration purposes only.

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