SERVICE MANUAL
C24EO SERIES
ELECTRIC
COUNTERTOP
STEAMERS
MODEL
ML
C24EO3
136006
C24EO5
136007
C24E05 SHOWN
This Manual is prepared for the use of trained Vulcan Service
Techniciansandshouldnotbeusedbythosenotproperlyqualified.
This manual is not intended to be all encompassing. If you have not
attended a Vulcan Service School for this product, you should read,
in its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
requiredtoperformtheprocedure. Proceduresforwhichyoudonot
have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
The reproduction, transfer, sale or other use of this Manual, without
the express written consent of Vulcan, is prohibited.
This manual has been provided to you by ITW Food Equipment
Group LLC ("ITW FEG") without charge and remains the property
of ITW FEG, and by accepting this manual you agree that you will
return it to ITW FEG promptly upon its request for such return at
any time in the future.
For additional information on Vulcan-Hart or to locate an authorized parts and
A product of VULCAN-HART
BALTIMORE, MD 21222
F25386 (June 2010)
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C24EO SERIES STEAMERS - GENERAL
GENERAL
INSTALLATION, OPERATION
SPECIFICATIONS
AND CLEANING
Water Requirements
Refer to the Installation & Operation Manual for
specific instructions.
A potable water supply does not guarantee that it's
suitable for steam generation. The water supply must
be within the following specifications or a local water
treatment specialist may need to be consulted. If a
water treatment system is installed, it must be
properly maintained.
INTRODUCTION
Features
!
!
!
!
Requires no water or drain line connections
(manual fill & manual drain).
!
!
!
!
!
Hardness*
Silica
- Less than 3 grains
- Less than 13 ppm
- Less than 4 ppm
- 7.0 to 8.0
Cast aluminum element block for efficient heat
transfer and distribution.
Total Chloride
Ph range of
Field convertible to single phase or three phase
power depending on the supply available.
Un-dissolved Solids - less then 5 microns
3.0 gallons maximum holding pan capacity.
* 17.1ppm = 1 grain of hardness
Steam Cooking
Electric
The C24EO series steamer provides timed or
continuous mode cooking in a pressure-less
compartment. The small physical size of the steamer
offers an efficient way to produce many foods in
small batches. Pressure-less, convection steam
cooking will steam cook fresh foods or will steam
defrost and cook frozen foods providing the
maximum color, flavor and nutritional value with the
least expenditure of energy and labor. The pressure-
less cooking compartment allows the operator to
open and close the door, anytime during a cooking
cycle.
AMPERAGE PER LINE
3 PHASE 1 PHASE
208V 240V 480V 208V 240V
22.2 19.2 38.5 33.3
33.3 28.9 14.4 57.7 50.0
TOTAL
KW
MODEL
C24EO3
C24EO5
NOTES:
8
-
12
1. Amperage values in the table are
nominal. Tolerance is +5/-10%.
2. C24EO3 - Shipped for 208V 60-50 HZ 3
phase connection. Field convertible to
240V three phase or 208/240V single
phase. See wiring diagram AI2853.
3. C24EO5 - Shipped for 208V or 240V or
480V 60-50 HZ, 3 phase. 208V and 240V
models are field convertible to 1 phase.
See wiring diagram AI2852.
Model Designations
!
!
C24EO3 - 3 pan capacity*
C24EO5 - 5 pan capacity*
*based on 2.5 inch pan depth
Exterior Dimensions
!
!
C24EO3 - 24" w x 33" d x 19.5" h
C24EO5 - 24" w x 33" d x 26" h
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C24EO SERIES STEAMERS - GENERAL
TOOLS
Standard
!
!
!
Standard set of hand tools
Clear silicone sealant
VOM with an AC current tester (any quality
VOM with a sensitivity of at least 20,000 ohms
per volt can be used)
!
Temperature meter & thermocouple
Special
!
!
Thermal Transfer Compound, Dow Corning 340
Part No. 819643-2 (13.5 oz. tube) or equivalent
for heating element assembly
Thermal Transfer Compound, Dow Corning 340
Part No. 519504 (2 oz. tube) or equivalent for
thermostats
!
!
Torque wrench (in.-lb.)
Tile Trowel 3/16" x 5/32" V notch; Grainger
catalog stock number 5LG08 or equivalent for
coating heating element assembly with thermal
transfer compound
!
Loctite® ODC-Free Cleaner and Degreaser
(McMaster-Carr Part No. 66415A21) or
equivalent fast drying, no residue cleaner.
!
!
!
Loctite® 7471™ Primer N™ Part No. 544434-2
Loctite® 271™ or equivalent
Loctite® 242™ Part No. 520228 for threads of
door screws
!
!
RTV 109 for securing gasket to door
Lubriplate 630AA for door handle sliding bracket
F25386 (June 2010)
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
Side Panels
1. Remove screws from bottom of panel.
4. Lift top cover off machine.
5. Reverse procedure to install.
Rear Panel
1. Remove screws securing rear panel.
2. Slide panel down to clear top cover.
3. Reverse procedure to install.
Top Cover
1. Remove SIDE PANELS.
2. Remove screws securing rear of top cover.
2. Disconnect tube from steam vent pipe.
3. Remove rear panel.
4. Reverse procedure to install.
COMPONENT PANEL
COMPONENTS
3. Remove nuts securing front of top cover.
1. Remove right side panel as outlined under
COVERS AND PANELS.
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
2. Disconnect lead wires to component being 4. Remove rotary shaft seal from timer shaft and
replaced.
remove timer.
5. Reverse procedure to install and check steamer
for proper operation.
3. Remove component.
HOLD THERMOSTAT
4. Reverse procedure to install replacement
component and check steamer for proper
operation.
NOTE: If replacing temperature control, see
TEMPERATURE CONTROL CALIBRATION in
SERVICE PROCEDURES AND ADJUSTMENTS.
TIMER
1. Remove right SIDE PANEL.
2. Remove lead wires and mounting nuts.
1. Remove right SIDE PANEL.
2. Disconnect lead wires to timer.
3. Remove hold thermostat.
4. Apply a small amount of thermal transfer
compound to the mating surface (disk side) of
the replacement thermostat.
A. Spread the compound completely and
evenly over the surface of the thermostat.
5. Reverse procedure to install and check steamer
for proper operation.
3. Remove timer knob.
F25386 (June 2010)
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
HIGH LIMIT THERMOSTAT
Do not sharply bend and kink, or clamp
down on the capillary tube or damage may occur.
1. Remove right SIDE PANEL.
2. Disconnect lead wires from high limit.
6. Remove high limit thermostat.
7. Reverse procedure to install and check steamer
for proper operation.
A. Apply a small amount of thermal transfer
compound between capillary bulb and
heating element assembly.
NOTE: Do not clamp bulb with excessive force.
LOW WATER THERMOSTAT
3. Remove thermostat from mounting bracket.
4. Remove screw and heat shield to access
capillary bulb.
1. Remove right SIDE PANEL and REAR PANEL.
2. Disconnect lead wires.
5. Loosen screws securing capillary bulb.
3. Remove low water thermostat.
4. Reverse procedure to install and check steamer
for proper operation.
A. Apply small amount of thermal transfer
compound to tip of thermostat.
B. Apply Loctite 242 to threads of thermostat.
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
1. Remove right SIDE PANEL.
C. Install thermostat hand tight. Do not over
tighten.
2. Remove screw and heat shield.
TEMPERATURE PROBE
1. Remove right SIDE PANEL and REAR PANEL.
2. Disconnect probe leads from the temperature
control.
3. Remove bolts.
NOTE: Support heating element assembly while
removing last bolt.
3. Remove temperature probe from steam vent
pipe.
4. Reverse procedure to install replacement probe
and check steamer for proper operation.
5. Adjust temperature control as outlined under
TEMPERATURE CONTROL CALIBRATION in
SERVICE PROCEDURES AND
4. Disconnect heating element leads from 1CON
and 2CON, noting their locations.
ADJUSTMENTS.
HEATING ELEMENT ASSEMBLY
Removal
The heating element assembly contains elements
molded into a cast aluminum block. The block is
mounted on the underside of cooking compartment.
Heating element assembly sits on springs which
compress to hold assembly tight to bottom surface of
steam chamber but allow for thermal expansion and
contraction.
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
5. Partially remove heating element assembly by
MANUAL DRAIN VALVE
pulling assembly towards you.
6. Remove high limit thermostat bulb and bracket.
1. Remove right SIDE PANEL and REAR PANEL.
2. Remove pin and washer to disconnect the
handle linkage from linkage bracket.
7. Remove heating element assembly.
Installation
NOTE: When replacing element assembly for 3 pan
unit with 240V supply, disconnect and insulate
element leads with orange, green, and red markers
(three 664W elements not used).
1. Completely and evenly coat heating element
assembly with thermal transfer compound using
notched trowel. (Use one 13.5 oz. tube of
thermal transfer compound)
3. Remove nut and linkage bracket.
4. Remove drain valve.
2. Partially install heating element assembly, then
mount high limit thermostat bulb and bracket to
assembly.
5. Reassemble parts removed in reverse order of
removal.
A. Apply pipe thread sealant to plumbing
threads before assembly.
A. Apply thermal transfer compound between
high limit bulb and heating element
assembly.
6. Check steamer for leaks and proper operation.
3. Install heating element assembly. Push element
assembly towards front of machine.
4. Connect lead wires to 1CON and 2CON in noted
positions.
5. Check steamer for proper operation.
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
3. Remove gasket plate.
DOOR
4. Remove gasket from inner door panel.
5. Remove RTV from bottom part of inner door
panel. Apply new RTV 109 to bottom of door
where shown when assembling gasket to door.
Removal
1. Close door.
2. Remove left SIDE PANEL.
3. Remove nuts from upper hinge located inside
front panel.
6. Place a small amount of RTV109 into the inner
door panel gasket screw holes before assembly.
7. Position the new gasket on gasket plate and
reverse procedure to install.
Handle Removal
1. Open door.
2. Remove screws from top and bottom of door
assembly.
4. Open door slightly, and while holding door, pull
upper hinge away from front panel.
5. Pull upper hinge out of upper door hinge
bushing.
6. Lift door assembly up and off lower door hinge.
7. Reinstall parts removed in reverse order of
removal.
8. Check door for fit and proper sealing of gasket.
Gasket
1. Open door.
2. Remove the shoulder screws and pan pusher
bracket from gasket plate.
3. Pull outer door housing away from inner door
panel starting at the hinge side of door to
separate the door halves.
NOTE: The smaller radius of the step spacers fit into
the slots of the outer door housing and is used to
provide clearance for handle operation.
4. Remove lock nuts and stepped spacers from
threaded studs of door handle.
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
8. Apply Loctite 7471 Primer N and Loctite 242 to
threads of screws before assembling.
9. Install screws to secure door halves together.
10. Check opening and closing operation of door.
Latch Assembly Removal and Disassembly
1. Separate outer door housing assembly from
inner door panel as outlined under DOOR
HANDLE REMOVAL.
2. Remove screws securing latch assembly to inner
door panel and remove latch mechanism.
Handle Installation
1. Apply Lubriplate 630AA around slots of outer
door housing where step spacers contact
housing.
2. Install door handle into outer door housing such
that hinge side of door housing is to the left and
arrow on handle is pointed upward.
3. Install step spacer with smaller radius toward
handle and door housing. Smaller radius is a slip
fit with outer door housing slot.
3. Remove E-clip from latch assembly pins and pull
pins from latch mechanism.
4. Install lock nuts and tighten until no gap exists
between handle, step spacer and lock nut. Do
not over-tighten lock nuts.
5. Close inner door panel so that latch mechanism
engages striker on front panel.
6. Install outer door housing onto inner door panel.
4. Remove retaining pin from spring pin.
7. Align the top and bottom screw holes of outer
door housing with inner door panel.
5. Separate sliding bracket from stationary bracket.
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C24EO SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
3. Check opening and closing operation of door.
Assembly
4. Check steamer for proper operation and leaks
around door seal.
1. Apply Lubriplate 630AA to sides of sliding
bracket.
2. Insert spring pin into bottom of sliding bracket.
A. Place spring over spring pin.
Hinge Bearings
1. Close door.
3. Assemble sliding bracket into stationary bracket.
2. Remove left SIDE PANEL.
4. While holding head of spring pin against bottom
of sliding bracket, insert spring pin into keeper
hole in bottom of stationary bracket.
3. Remove nuts from upper hinge located inside
front panel.
4. Open door slightly, and while holding door, pull
upper hinge away from front panel.
A. Secure spring pin in place with retaining pin.
5. Pull upper hinge out of upper door hinge bearing.
6. Lift door assembly up and off lower door hinge.
7. Pry hinge bearing out from door assembly.
8. Remove outer door housing.
NOTE: Install pins such that heads of pins will be
facing inward toward hinge side of inner door panel
when latch assembly is installed.
5. Install pins to assemble stationary and sliding
brackets together.
Do not drive bearing into place. The inner
door panel could be damaged. Press bearing into
position.
A. Secure pins into position with E-clip.
Installation
NOTE: When replacing door hinge bearings, replace
both hinge bearings.
1. Install latch assembly onto inner door panel with
spring pin toward bottom of door panel.
9. Position replacement hinge bearing over hinge
opening in door assembly.
A. Apply Loctite 271 to threads of screws
before assembly and secure latch assembly
to inner door panel.
A. Press hinge bearing fully into door assembly
using a C-clamp or equivalent.
10. Reassemble parts removed in reverse order.
2. Install outer door housing assembly as outlined
in DOOR HANDLE INSTALLATION.
11. Check door for fit and proper door gasket
sealing.
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C24EO SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
SERVICE PROCEDURES AND ADJUSTMENTS
D. Open door.
DOOR LATCH ADJUSTMENT
2. Remove striker.
Opening a Jammed Door
3. Remove any burrs on striker that may cause
Should the steamer door jam and cannot be
opened, DO NOT FORCE OR PRY the door as
damage will occur.
latch to stick.
4. Apply Loctite 271 to threads of striker.
5. Reinstall striker with slotted side up. Snug striker
nut. Perform Adjustment, so door will not jam.
1. Lift up on bottom of door at the handle end to
disengage latch.
Adjustment
A. If door does not open, remove right SIDE
PANEL.
1. Reinstall striker with slot pointing upward and
hand tighten nut only.
B. Locate the striker that catches on door latch
near steam chamber on front panel.
2. Close door to center striker in front panel
mounting hole.
3. Open door and check striker slot for horizontal
alignment. The slot on striker must be kept
horizontal in order for door latch to catch
properly and latch.
4. Once proper slot alignment has been set, hold
striker close to its base then tighten the striker
nut. Be careful not to damage striker slot when
tightening or door may not latch properly.
NOTE: Do not over-tighten nut. If over-tightened,
striker may turn and change alignment.
NOTE: If door does not open easily, add shims
between striker and cabinet front. When adding
shims make certain that door gasket seals properly
and steamer does not leak. Remove shims as
necessary until leaking stops.
C. Remove nut from striker and this should
release it from the panel.
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C24EO SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
3. Check for proper operation.
HEATING ELEMENT TEST
WATTS AMPS PER
OHMS PER
ELEMENT
The heating element assembly contains elements
molded into a cast aluminum block. 3 pan units have
6 elements and 5 pan units have 3 elements. See
wiring diagrams.
MODEL VOLTS
PER
ELEMENT
ELEMENT
LEAD
208
2003
664
9.6
3.2
21.6
65.2
21.6
10.8
14.4
19.2
208
1. Turn cooking mode switch to constant.
C24EO3
240
208
2667
4000
4000
4000
11.1
19.2
16.7
14.4
2. Measure voltage at heating element terminals on
contactors and verify it against data plate
voltage.
240
C24EO5
NOTE: For 480V units, element voltage is 277V.
480
A. If voltage is incorrect, find the source of the
problem.
1. Values in the table are nominal. Tolerance
is +5/-10%.
B. If voltage is correct, check current draw
(amps) through the heating element lead
wires.
2. 3 pan 208V units use three 2003W
elements and three 664W elements.
3. 3 pan 208/240V units share the same
element assembly block. 240V units use
only the three 2003W-marked elements
(2667W actual).
NOTES:
NOTE: This method is preferred over a
resistance check when a clamp on type amp
meter is available.
4. Resistance values (ohms) are @ 77"F
room temperature.
1) If current draw is correct then heating
element is functioning properly. See
table below for proper values.
2) If current draw is not correct, turn
cooking mode switch to OFF and
disconnect the electrical supply.
a. Replace heating element assembly
then proceed to step 3.
C. If unable to check current draw, a resistance
check may indicate a malfunctioning
element.
1) Turn the cooking mode switch to OFF
and disconnect the electrical supply.
2) Remove the lead wires from the heating
element and check resistance (ohms).
See table below for proper values.
F25386 (June 2010)
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C24EO SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
1) Turn the temperature control dial
TEMPERATURE CONTROL
CALIBRATION
clockwise to increase temperature or
counterclockwise to decrease
temperature.
To set the temperature control for optimum steamer
operation, the elevation above sea level for the
service location must first be determined. The
steamer was preset at the factory to sea level.
NOTE: During temperature control adjustment,
display will blink on/off. When display reverts to a
steady image, that displayed temperature set point
has been "locked in" to memory.
The elevation is used in conjunction with the
elevation table below, to determine the correct set
point temperature for the control.
NOTE: If the set point temperature is too high, the
excess boiling action will cause water droplets to exit
the steam vent pipe, and cause high water usage.
1. Remove right SIDE PANEL as outlined in
REMOVAL AND REPLACEMENT OF PARTS.
2. Place a thermocouple approximately one inch
down in the center of steam vent pipe.
3. Turn steamer on by selecting constant mode.
4. Allow steamer temperature to stabilize by
completing two heating cycles.
5. Record the temperature reading when cook light
goes out.
6. Using the elevation table, compare the recorded
temperature to the temperature listed for the
specific elevation.
NOTE: Use temperature scale on control dial plate
for reference only. The scale represents dial turns in
1°F increments, not the actual temperature. When
calibrating, use the recorded temperature taken from
thermocouple.
ELEVATION (FT)
Sea Level
1,000
TEMPERATURE (EF)
210
208
206
204
202
200
198
196
195
194
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000 or above
A. If the set point temperature of the control is
correct, no adjustment is necessary.
B. If the set point temperature of the control is
not correct, adjust the temperature control.
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
ELECTRICAL OPERATION
COMPONENT FUNCTION
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Creates audible signal when timed cook cycle is complete and
when a low water condition exists.
Limiting Contactor (1CON) . . . . . . . . . . . . . . . Supplies line voltage to heating element assembly. Energized
whenever Power Switch (1S) is on and High Limit Thermostat
(1TAS) and Low Water Thermostat (2TAS) are closed.
Regulating Contactor (2CON) . . . . . . . . . . . . . Supplies line voltage to heating element assembly. Energized
whenever Hold Thermostat (3TAS) is closed or the temperature
controller calls for heat.
Heating Element . . . . . . . . . . . . . . . . . . . . . . . . Located below water reservoir. Heats water to produce steam.
Fuses (1FU & 2FU) . . . . . . . . . . . . . . . . . . . . . . Protect control circuitry from over-currents.
Low Water Light (1LT) . . . . . . . . . . . . . . . . . . . Amber (AM) colored light. Lit when Low Water Thermostat
(2TAS) senses water level is too low inside steamer.
On Light (2LT) . . . . . . . . . . . . . . . . . . . . . . . . . Amber (AM) colored light. Lit when Power Switch (1S) is on.
Cook Light (3LT) . . . . . . . . . . . . . . . . . . . . . . . Red (RD) colored light. Lit when High Limit (1TAS) and Low
Water (2TAS) thermostats are closed, door is closed and timer
is set.
Relay (K1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controls Regulating Contactor (2CON) based on input from
Hold Thermostat (3TAS) and Temperature Controller. Does not
allow Timer Motor to run while Hold Thermostat (3TAS) is
closed.
Relay (K2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latches Power Switch (1S) circuit. Turns on Low Water Light
(1LT) and Buzzer when steamer is low on water.
Relay (K3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlled by Power Switch (1S). Keeps Buzzer from sounding
and Low Water Light (1LT) off when switch is in off position.
Power Switch (1S) . . . . . . . . . . . . . . . . . . . . . . Rocker switch that turns steamer OFF and ON (momentary on).
Switch also resets Low Water Light (1LT) and Buzzer.
Door Switch (1SW) . . . . . . . . . . . . . . . . . . . . . Removes power from a portion of the steamer control circuit
when door is opened.
High Limit Thermostat (1TAS) . . . . . . . . . . . . . Protects steamer by removing control circuit power if the heating
element assembly temperature goes above 495EF.
Low Water Thermostat (2TAS) . . . . . . . . . . . . Monitors presence of water inside steamer.
Hold Thermostat (3TAS) . . . . . . . . . . . . . . . . . Controls temperature of cavity for pre-heat/hold mode (opens at
175E F). Disables timer countdown if cavity temperature is too
low.
Timer Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . Counts cook time of product when time is dialed. Energizes
buzzer and de-energizes temperature controller when time
expires.
Temperature Control . . . . . . . . . . . . . . . . . . . . Monitors temperature probe and cycles power to regulating
contactor (2CON) for steam generation.
Temperature Probe . . . . . . . . . . . . . . . . . . . . . Senses cooking compartment temperature at steam vent and
sends a corresponding DC voltage back to the temperature
control (J-type thermocouple).
Transformer (1T) . . . . . . . . . . . . . . . . . . . . . . . Steps down line voltage to 120VAC control circuit voltage.
F25386 (June 2010)
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
COMPONENT LOCATION
CONTROL PANEL COMPONENTS
FRONT PANEL COMPONENTS
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
3. Steamer reaches 175°F.
SEQUENCE OF OPERATION
A. Hold thermostat opens and relay K1 coil is
de-energized.
Schematic diagram AI2851 will be used to explain
the electrical sequence of operation.
1) K1-3 N.O. contacts close and remove
line voltage to heating element
assembly.
Timed Cooking Mode
1. Conditions.
2) K1-1 and K1-2 N.C. contacts return to
close condition.
A. Steamer connected to correct voltage and
is properly grounded.
NOTE: Steamer will maintain hold temperature
until a cook time is dialed on timer, door is
opened, or power switch is turned off.
B. Power switch (1S) off.
1) Relay K3 energized. K3 N.C.
contacts open.
4. Set cook timer to desired time.
C. High limit thermostat closed.
D. Hold thermostat closed.
NOTE: Timer motor will not run when hold
thermostat (3TAS) is below 175°F.
E. Low water thermostat closed.
A. Timer contacts close, timer motor is
energized and timing down begins.
F. Temperature control is setup properly and
is ready to use.
NOTE: Additional time can be set or the cook
timer can be turned off throughout the cooking
cycle. If turned to off, steamer reverts to hold
temperature.
G. Door closed (door switch closed).
H. Timer off.
I.
Cooking compartment filled to the water
level mark and below hold temperature of
175°F (+/- 5°F).
B. Cook light (3LT, red) comes on.
C. Temperature controller energized and
evaluates input from thermocouple.
J. Drain valve is closed (drain lever pushed
in).
1) If temperature is below set point,
temperature controller internal N.O.
contacts close and energize
2. Press momentary start switch (1S).
regulating contactor (2CON) coil thru
K1-2 N.C. contacts.
A. Limiting contactor (1CON) coil energized
thru high limit thermostat (1TAS).
a. Line voltage is supplied to other
side of heating elements.
Elements heat.
1) Line voltage is supplied to one side of
heating elements.
B. Relay K2 coil energized thru low water
thermostat (2TAS).
5. Temperature reaches set point and the
temperature control’s internal N.O. contacts
open.
1) K2-1 N.O. contacts close.
a. Power switch circuit is latched.
2) K2-2 N.C. contacts open.
A. Regulating contactor (2CON) coil de-
energized and power is removed from
heating elements.
a. Low water light (1LT) and buzzer
are de-energized.
6. Steamer cycles on the temperature control until
cook time expires.
C. ON indicator light (2LT, amber) comes on.
7.
Time expires on cook timer.
D. Relay K1 coil energized thru door switch
and hold thermostat (3TAS).
A. Timer contacts 11 & 13 open, timer motor
is de-energized and timing stops.
1) K1-3 N.O. contacts close and
regulating contactor (2CON) coil is
energized.
B. Timer contacts 11 & 14 close.
1) Buzzer energized thru K2 N.O.
contacts and sounds.
a. Line voltage is supplied to other
side of heating elements.
Elements heat.
NOTE: The buzzer continues to sound until
timer dial is set to off position or additional
time is set.
2) K1-2 N.C. contacts open.
3) K1-1 N.C. contacts open (prevents
timer from being energized during pre-
heat).
C. Timer contacts 21 & 23 open, cook light
(3LT, red) goes out and temperature
controller is de-energized.
F25386 (June 2010)
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
1) K1 N.O. contacts close and regulating
8. Turn cook timer off.
contactor (2CON) coil is energized.
A. Timer contacts 11 & 14 open, buzzer is de-
energized.
a. Line voltage is supplied to other
side of heating elements.
Elements heat.
B. Steamer reverts to hold temperature and
continues to cycle until a cook time is
dialed on timer, power switch is turned to
off, or the door is opened.
2) K1 N.C. contacts open.
3. Steamer reaches 175°F.
NOTE: If water level becomes low during
cycling, low water thermostat (2TAS) will open
and low water light (1LT, amber) will come on
and buzzer will sound. Timer and heating circuit
will be de-energized until water level is
replenished and thermostat closes.
A. Hold thermostat opens and relay K1 coil is
de-energized.
B. K1 N.C. contacts close and N.O. contacts
open.
NOTE: Steamer will maintain hold temperature
until a cook time is dialed on timer, door is
opened, or power switch is turned off.
Constant Cooking Mode
1. Conditions.
4. Set cook timer to constant.
A. Steamer connected to correct voltage and
is properly grounded.
A. Timer contacts 21 & 23 close, cook light
(3LT, red) comes on.
B. Power switch (1S) off.
B. Temperature controller energized and
evaluates input from thermocouple.
1) Relay K3 energized. K3 N.C.
contacts open.
1) If temperature is below set point,
temperature controller internal N.O.
contacts close and energize
C. High limit thermostat closed.
D. Hold thermostat closed.
regulating contactor (2CON) coil thru
K1 N.C. contacts.
E. Low water thermostat closed.
F. Temperature control is setup properly and
is ready to use.
a. Line voltage is supplied to other
side of heating elements.
Elements heat.
G. Door closed (door switch closed).
H. Timer off.
5. Temperature reaches set point and the
temperature control’s internal N.O. contacts
open.
I.
Cooking compartment filled to the water
level mark and below hold temperature of
175°F (+/- 5°F).
A. Regulating contactor (2CON) coil de-
energized and power is removed from
heating elements.
J. Drain valve is closed (drain lever pushed
in).
6. Steamer cycles on the temperature control until
cook timer turned off.
2. Press momentary start switch (1S).
A. Limiting contactor (1CON) coil energized
thru high limit thermostat (1TAS).
7.
Turn cook timer off.
A. Timer contacts 21 & 23 open, cook light
(3LT, red) goes out and temperature
controller is de-energized.
1) Line voltage is supplied to one side of
heating elements.
B. Relay K2 coil energized thru low water
thermostat (2TAS).
B. Steamer reverts to hold temperature and
continues to cycle until a cook time is
dialed on timer, power switch is turned to
off, or the door is opened.
1) K2 N.O. contacts close.
a. Power switch circuit is latched.
2) K2 N.C. contacts open.
NOTE: If water level becomes low during
cycling, low water thermostat (2TAS) will open
and low water light (1LT, amber) will come on
and buzzer will sound.
a. Low water light (1LT) and buzzer
are de-energized.
C. ON indicator light (2LT, amber) comes on.
D. Relay K1 coil energized thru door switch
and hold thermostat (3TAS).
Page 19 of 24
F25386 (June 2010)
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
SCHEMATIC DIAGRAM
F25386 (June 2010)
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
WIRING DIAGRAMS - HEATING
ELEMENTS
C24EO3 - 208V/240V
Page 21 of 24
F25386 (June 2010)
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
C24EO5 - 208V/240V
F25386 (June 2010)
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C24EO SERIES STEAMER - ELECTRICAL OPERATION
C24EO5 - 480V
Page 23 of 24
F25386 (June 2010)
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C24EO SERIES STEAMER - TROUBLESHOOTING
TROUBLESHOOTING
SYMPTOM
POSSIBLE CAUSES
Compartment leaks water around door.
1. Steamer not level.
2. Steamer overfilled.
Steam leaks around door.
1. Worn gasket.
2. Damaged gasket.
3. Steam vent pipe blocked.
4. Door not adjusted.
Steamer will not heat (cook light off, low
water light off).
1. Line voltage incorrect or transformer malfunction.
2. Control circuit fuse(s) open.
3. High limit thermostat open.
4. Door open or door switch malfunction.
5. Power switch off or inoperative.
6. Relay K3 malfunction.
7. Timer malfunction or timer off (timed mode only).
Steamer will not heat (cook light on, low
water light off).
1. Line voltage incorrect.
2. Heating element malfunction.
3. Regulating contactor malfunction.
4. Relay K1 malfunction.
5. Temperature probe malfunction.
6. Temperature controller malfunction.
Timer motor does not run.
Door not closing properly.
1. Door open or door switch malfunction.
2. High limit thermostat open.
3. Low water thermostat open.
4. Timer inoperative.
1. Door latch assembly.
2. Striker adjustment.
Door won’t open.
1. Latch inoperative.
Buzzer not operating.
1. Timer malfunction.
2. Buzzer malfunction.
Water spraying out of steam vent pipe
during a cook cycle.
1. Temperature control set point too high.
2. Temperature probe malfunction.
3. Temperature control malfunction.
High water usage.
1. Temperature control set point too high.
2. Temperature probe malfunction.
3. Temperature control malfunction.
4. Steamer operating in constant mode.
Excessive or inconsistent cook times.
1. Door left open between loads.
2. Temperature control set point too low.
3. Heating element malfunction.
F25386 (June 2010)
Printed in U.S.A.
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