Star AM24SS SERVICE MANUAL

Toastmaster, 10 Sunnen Drive, St. Louis, MO 63143, [phone]

2M-32345

1. De-energize
griddle

to

griddle

cool. This reduces

IN

at disconnect

the flash

switch. This will cut off

CASE OF FIRE

power

point

temperature

making it

to the heating

easier to stop the fire.

elements allowing

2. Cover
blanket

Do not

buming

making it

RETAIN

manual

This

contains

malfunction.

the

affected area

or

cover

to seal

attempt

to

grease.

difficult to contain the fire.

THIS

provides

information

manual

This

with

off

air thus smotherino

grease

fight

a

The

force will

and

oils and suitable

MANUAL FOR

detailed

to assist the

is

an important

DO

OR

OTHER FLAMMABLE

IN THE

VICINITY

a heavy blanket

the fire.

CAUTION:

playing

fire

by

cause the

information

technician
readilY

FOR

NOT

buming

Only

use a

for electric

for

tool for the

available.

YOt.IR SAFETY

STORE

OF

TH|S OR ANY

canvas. Play the fire

or

the

nozzle of the fire extinguisher

grease

fire

extinguisher

be

to

powered

FUTUHE

servicing the

in diagnosing

authorized

OR USE

VAPORS

problems in

GASOLINE
OTHER

extinguisher

sprayed to
filled with
equipment.

REFERENCE

Accu-Miser

technician

OR LIQUIDS

APPLIANCE

nozzle over the

directly on the

adjoining

which

CO.

griddle.

event

the

should be

and

equipment

is for liquids

lt

also

of a

kept

Using

genuine

parts

manufacturer

Toastmaster

to change

without

the

provements,

specifications

notice.

buyer

to

previously

NCTICE

parts

any

Toastmaster

relieves

NOTICE

(Manufacturer)

Such revisions

corresponding

additions or

purchased

other

of

all liability.

reserues

and

replacements

equipment.

than

factory

the

the

product

not

do

changes,

right

design

entifle

im-

for

TABLE OF

CONTENTS

Description

Sequence
Specifications
Accessing
Temperature

Calibration

Heating

Removal

Thermocouples

Critical

Or/Off

----------------

of Operation

Griddle

the

Control

of Temperature

Elemqnts

and

---------

Replactment-

Switch

for Service

--

Replacement

Control

7

3
5

8

l0

t2
13

14

-------

LED
Wiring Schematics

t4

15
2l

W.

AM

All
control

First,
and
The

ACCESSING

Series

griddles

panel.

grease

the

down

slid

bottom

drawer

to

the

of

allow

TIIE.GRIDDLE

serviceable.

front

are

must be

the

panet

removed
top lip
is NdT

of

ningla

FOR

the

SBRVICO

from

panel

to

All controls

the front

drop

to
the

of

free

griddle.

elements

and

griddle. The

the

recess

the

of

Thke

care

accessed

are

panel

in which

not to

drop

can

it is

through

be unscrewed

then

fitted.

the

CAUTION:

panel'

the

front

the

Once
horizontal
cavity

shown

u, ,ho*n

below.

panel

is

position,

free,

the

below.

the top

bottom

panel

The

edge

lip of

should

panel can be

of

panet

the

be secure

.*

pulled

fitted

br

and

towards

out

into the

should

you. With

bottom

flat suspended

lay

front

the

edge

from

panel

of

held

the

griddle

the cables

in a

as

Pariel Being

Control

Grease

Drawer

Service

Note: Griddle

Under

Fitted

Enclosure

Postion

Cooking

Control

Of

Surface

Not

Panel

Shown

In Figure

V. TEMPERATTJRECONTROL

A. Tboubleshooting

Troubleshooting

Verify output

load

side

state control-

examplesA&Bbelow

208-24o VAC

exists across

terminals

indicating

Check

(208-240

input

terminals

control.

from

the

of

power

the output

as in

exampie B

an OPEN

for

input

VAC)

inro

The

the

solid

See

reading

relay.

power

the

of the

Solid

State Temperature

power

a

(0
as in
relay.

(110

volt

a CLOSED

VAC) reading

the output

example

sure

-120

terminals of

ground

meter.

No

exists across

terminals

indicating

Check to be

present

is
at both output
the control to

Centrol

A

powel

VAC)

using

No

208-240

power

VAC

Check electrical

utility to

such as the

circuit

griddle

main

breaker,

ofF

Check

continuity

power

supply

wiring

to the

control.

of

Check

Potentiorneter

for

switch

proper

therrnocouple

properly

and has

lf No:

Recitify

Condition.

the following:

set

to call

heat;

onloll

has

continuity;

is

connected

continuity.

lf Yes:

Replace

Control

Problem

power

to the element

open

the element..See

troubleshooting

with

distribution

or

cilcUit in

elements.

CLOSED

Find

the open

power'ledd

common

output

feeding

side of

circuit

control.

o{

OPEN

Tfoubleshooting

Cont.

than one solid

In the event
control is suspect.
good

indication

The control
exceeds

compartment

the
for hot adjacent

more

of

is designed

eitherthe

70oC,

equipment, improperty installed insulation

Check

a

has exceeded

uting conditions.

B.

Replacement

Proper replacement

to clean off all of the old thermal compound

control, be
use new
compound
control to the
underside
compound
Purchase

sure

therrnal

compound when replacingthe solid

(silicone)

metal

(metal

will

side)

deter rather than help to transfer away

the compound

control fails

state

for

any blown

power

spike

on one

to

operate,with a

control's

thermal compound has

maximum

of the solid state

is an important and
plate

of

which it is mounted. The.thermal

orl

the

control as a

varistors

phase

of the

maximum heatsink

ambient.

control is essential for

mandatory

thin film

under TM Part Number 3103116.

same time, the

the

at

ouput

across

the

lines

to the

temperature of 7fC.

been improperly

In addition

to

under the

proper performance.

left behind

control. Use

state

that allows

step

approximately

heat

the

line voltage suppty to the

terminals

griddle

applied orthe temperature

improperly

elentents,

from the old

of'the special

proper

for

compound

inch

.001

generated

by the

Control. This is a

of the

If the control

in

installed controls, check

other heat contrib-

or

Before

installing the

control. Always

heat

is to be

(0A254

oil

based

transfer from the

applied to the

cm).

thermal

Too

much

control's thyristor.

For wiring reference
The baseplate

The load

mounting

terminals should

wires.
Always

replaqp the
control. The
and

off.

The

terminal amperage

varistor across the high

varistor

voltage

is

to the

control,

Figure 1

see

screws should be

be torqued

to

provides proctoction

tolprarice on the load

40 Amps

RMS.

below.

tightened

10

voltage

inch

to

lbs

oiitput

from voltage

terminals

AC Output

of

pounds

inch

.15

whe:r securing

terminals on the

spikes as the

control is 20 - 300

the

for exact

contact to

the terminal

control. when

tyristor

switches

Volts

Thermocouole

the

surface.

connections of the

the

on

load

RMS

changing

power

the

and the

A

On/Off
Switch

Potentiometer

From

Figure I.

VI.
A. Ttoubleshooting

CALIBRATION

OF TIIE

POTENTIOMETER

Calibration

plate

tion

The allowable
this temperature
point

temperature.

B.

Calibrating

Note:Before

and all
with any
thermocouple
provide
(calibration)
when

taking
ment of
surface.

When taking
griddle

with

a

combination

from

ture

of the

should become

temperature

Procedure

making

panels

surface

piece

including

of the

for

the thermocouple

panels

at

a more

indicated

as
temperature

the temperature

OF THAI ZONE.

high

of

helps

probe.

the

potentiometer

jarred

range

paftrmeterthe

any calibration

the front

open

will

the control.

accurate

temperature

to aquire

This

calibration

in

Appendix

readings

probe

test

of the

the most

is

necessary

loose

from

its

of the

temperature

control

allow

The

insulation

gdddle

should

adjustments,

panel

for a

cooler

give

may

off

is

griddle,

temperature

accurate

an

even

A. A good

griddle

the
cmcial.

the

(1000

readings

only

after replacement

factory

is

must

inaccurate

though

See Figure

temperature

calibrated position.

15CPF(65'C)

fluctuate

griddle

the

be in

their closed position-

junction

indication.

the

control

K temperature

tvpe

surface for

8 for

probe

should

degrees

C) between

possible

of the

450'F(230.C)

to

no

more than

should

temperature

calibration

proper probe

probe

be

without the

up

be

at
Keeping
provide

does

indicator

should be

held down

the

controller

for

+14"F(j'C)

to

temperature

Calibrating

the connectiorrpoiniof

the

an ice

source

adjustrnents.

placement

placed

by an aluminum weight

probe

and

weight

absorbing

if

or

the

calibra-

each zone.

panelsrclosed

point

must

Proper

on thr

at the center

weight.

the

Within

from the

and cycling

griddle

the

reference

be

place-

griddle

of the

tempera-

set

the

will

used

This

1) Determine if

F(7"C) above

For Steps 2

2) Remove
Loosen

3)

remove.

4)

Turn the

5) Once

undershoot

6)

screw and the

7)

proper

Tighten the calibration
Replace

the temperature

or

below the

-7

refer

to figure

the temperature

the L/2" nut

screw in its

calibration

and cycle

area next to

the control

of

point

set

9

control

around

slot to

within

off

knob making

the

the left

has

been

14"F(7'C)

screw

the

screw with

and the

the center

of 350"F(175"C).

knob

to

potentiometer

to lower

obtained,

of

l/2"

a tamper

sure

it aligns

the

of

gain

access to

shaft and loosen

the

temperature

the

call for heat

overshoot.

potentiometer

proof

with

griddle

the 350'dial

surface

the calibration

or to the

LED will

nut

shellack.

for

that zone

adjustment

the calibration

right

illuminate

paint

and

indicaror

the head

is more than

screw but do not

to raise

within 14'F(7'C)

of the

mark.

screw.

temperature.

the

calibration

+14.