Vulcan-Hart C24EA SERIES User manual

C24EA SERIES ELECTRIC
CONVECTION STEAMERS
C24EA6 ML-136058
C24EA10 ML-136059
- NOTICE -
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified.
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
required to perform the procedure. Procedures for which you do
not 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.
SERVICE MANUAL
A product of Vulcan-Hart 3600 North Point Blvd Baltimore, MD 21222
F35453 Rev. A (0119)

TABLE OF CONTENTS
SERVICE UPDATES ....................................................................................... 4
SERVICE UPDATES ................................................................................... 4
TIS DOCUMENT LIST - C24EA SERIES ELECTRIC CONVECTION STEAMERS ........................ 4
GENERAL .................................................................................................. 6
INTRODUCTION ....................................................................................... 6
MODELS COVERED ................................................................................... 6
SPECIFICATIONS ...................................................................................... 6
REFERENCE MATERIAL ............................................................................... 7
LUBRICATION ......................................................................................... 7
TOOLS ................................................................................................. 7
COVERS AND PANELS .................................................................................... 8
FRONT BASE PANEL .................................................................................. 8
RIGHT AND LEFT SIDE BASE PANELS ................................................................ 8
REAR BASE PANEL .................................................................................... 8
COOKING COMPARTMENT RIGHT AND LEFT SIDE PANELS .......................................... 9
DOOR .................................................................................................... 10
REMOVAL ............................................................................................ 10
GASKET .............................................................................................. 10
DOOR HANDLE ....................................................................................... 10
LATCH ASSEMBLY ................................................................................... 11
HINGE BEARINGS .................................................................................... 13
DOOR LATCH ADJUSTMENT ......................................................................... 13
THERMOSTAT AND HIGH LIMITS ........................................................................ 15
HEAT EXCHANGER HIGH LIMIT ...................................................................... 15
STEAM GENERATOR HIGH LIMIT .................................................................... 15
CONDENSATE THERMOSTAT ........................................................................ 16
TIMERS ................................................................................................... 18
REMOVAL AND REPLACEMENT ..................................................................... 18
HEATING ELEMENTS AND CONTACTORS ............................................................... 19
REMOVAL AND REPLACEMENT HEATING ELEMENTS AND CONTACTORS ......................... 19
HEATING ELEMENTS DIAGNOSTIC CHECK .......................................................... 20
HEAT EXCHANGER ELEMENTS AND RELAYS ........................................................... 21
REMOVAL AND REPLACEMENT ..................................................................... 21
HEAT EXCHANGER ELEMENTS DIAGNOSTIC CHECK ............................................... 22
WATER LEVEL CONTROL COMPONENTS ............................................................... 24
WATER LEVEL CONTROL - LOW LEVEL CUT-OFF AND DIFFERENTIAL OPERATION ................ 24
WATER LEVEL CONTROL ............................................................................ 25
WATER LEVEL PROBES .............................................................................. 26
FILTERED AND NON-FILTERED DUAL WATER SOLENOID VALVES ................................. 26
MOTORIZED DRAIN VALVE .......................................................................... 27
SWITCHES, SOLENOIDS, RELAYS AND BUZZER ........................................................ 31
POWER AND DELIME SWITCHES .................................................................... 31
DOOR SWITCH ....................................................................................... 31
PRESSURE SWITCH (1PAS) .......................................................................... 32
PRESSURE SWITCH (2PAS) .......................................................................... 34
VACUUM RELIEF SOLENOID ......................................................................... 35
COMPARTMENT STEAM SOLENOID ................................................................. 35
TIME DELAY RELAY .................................................................................. 36
C24EA SERIES ELECTRIC CONVECTION STEAMERS
F35453 Rev. A (0119) Page 2 of 75

BUZZER .............................................................................................. 36
CONTROL BOARD ........................................................................................ 38
CONTROL BOARD REMOVAL AND REPLACEMENT ................................................. 38
LAYOUT AND LED LEGEND .......................................................................... 38
STEAM GENERATOR OPERATIONAL STATUS (LED INDICATORS) .................................. 40
DELIMING CYCLE STATUS (LED INDICATORS) ...................................................... 44
HEAT EXCHANGER ...................................................................................... 49
HEAT EXCHANGER REMOVAL AND REPLACEMENT ................................................ 49
MOTORIZED DELIME VALVE ......................................................................... 49
STEAM GENERATOR ..................................................................................... 51
STEAM GENERATOR REMOVAL AND REPLACEMENT ............................................... 51
DELIMING ............................................................................................ 52
ELECTRICAL OPERATION ................................................................................ 53
COMPONENT FUNCTION STEAM GENERATOR CONTROLS ........................................ 53
COMPONENT FUNCTION COOKING COMPARTMENT CONTROLS .................................. 55
COMPONENT LOCATION ............................................................................. 56
SMART CYCLE POWER MANAGEMENT .............................................................. 59
SEQUENCE OF OPERATION ......................................................................... 60
SCHEMATICS AND WIRING DIAGRAMS .............................................................. 65
TROUBLESHOOTING ..................................................................................... 73
TROUBLESHOOTING ................................................................................. 73
C24EA SERIES ELECTRIC CONVECTION STEAMERS
© VULCAN 2019
Page 3 of 75 F35453 Rev. A (0119)

SERVICE UPDATES
SERVICE UPDATES
October 2017
• Changed pressure switch setting in PRESSURE
SWITCH (1PAS) data module.
• Updated Reducer Bushing Grainger PN. TOOLS
TIS DOCUMENT LIST - C24EA SERIES ELECTRIC CONVECTION STEAMERS
SERVICE TAB
Document Title Document Type
C24EA-LWE SERIES COUNTERTOP STEAMER
Manual Service Manual
C24EA and HC24EA Series Steamers - Motorized Valve
Change Technical Service Bulletin (TSB)
SERVICE TAB (Multimedia)
Document Title Document Type
All Stainless Steel with Automatic Timers & Manual
Boilers Direct Steam - ST. STL. LEG, Pedestal or Wall
Mounted Owners Manual
Instructions
Electric Steamers I &O Manual Operators
C24EA6 and 10 Door Gasket Replacement Service (Video)
C24EA6 and 10 Door Handle Replacement Service (Video)
C24EA6 and 10 Door Latch Replacement Service (Video)
C24EA6 and 10 generator heating elelment Service (Video)
C24EA6 and 10 Generator High Limit Service (Video)
C24EA6 and 10 heat exchanger High Limit Service (Video)
C24EA6 and 10 Operating Pressure Switch Adjustment Service (Video)
C24EA6 and 10 Operating Pressure Switch Adjustment
Replacement Service (Video)
C24EA6 and 10 Water Level Board Explanation Service (Video)
Fundamentals of Steam Service Instructions
Fundamentals of Gas Service Instructions
Hobart Water Filter Replacement Cross Reference Sheet Service Instructions
Pilot & Burner Problems on Units Without Powered
Burners Service Information Service Instructions
ScaleStick Twin System, Part No. 01-234301-51200 Service Instructions
Water Level Pressure Switches Information Service Instructions
Rating Plate Locations on Current Vulcan-Hart/Wolf
Range Equipment Technical Service Bulletin (TSB)
SB630 Gas Range Thermocouples Technical Service Bulletin (TSB)
SB760 Vulcan Steam Temporary Service Instruction /
Inspect All Warrick Water Level Technical Service Bulletin (TSB)
C24EA SERIES ELECTRIC CONVECTION STEAMERS - SERVICE UPDATES
F35453 Rev. A (0119) Page 4 of 75

SERVICE TAB (Multimedia)
SB800 Vulcan Steam Equipment - Enhanced Ignition
Modules Technical Service Bulletin (TSB)
SB860 Atmospheric Steamer Door Switch Actuator Rod Technical Service Bulletin (TSB)
TSB 1374 Water Level Control Part No. 844069-1
Changes Technical Service Bulletin (TSB)
TSB 1392 C24EA6 and C24EA10 Electric Floor Model
Steamers - 480V Superheat Technical Service Bulletin (TSB)
TSB 1393 Steam Cooking Equipment - Prevention,
Detection and Treatment of Corrosion on Stainless Steel Technical Service Bulletin (TSB)
TSB 1037A Hobart to Vulcan "Common" Model Cross
Reference List Technical Service Bulletin (TSB)
TSB 1298A Atmospheric Steamer Door Switch Actuator
Rod Technical Service Bulletin (TSB)
TSB 1339 Vulcan High Efficiency Gas Steamers - Burner
Noise Technical Service Bulletin (TSB)
Hobart & Vulcan Steamers/Kettles with Warrick Water
Level Control Boards Temporary Service Instructions (TSI)
Steamers - Main Transformer Primary Tap on Electric
Machines Temporary Service Instructions (TSI)
Steamers - Motorized Valve P/N 856718-1 Temporarily
Unavailable Temporary Service Instructions (TSI)
Steamers Wire Insulation Pinched Under Screw Lug on
Terminal Block & Contractors Temporary Service Instructions (TSI)
PARTS TAB
Document Title Document Type
C24EA Series Steamer Parts Catalog
SMF SCALEBLOCKER WATER FILTER SYSTEM Parts Catalog
DIAGRAMS TAB
Document Title Document Type
00857305c.dwg 208/240/480 Diagram
C24EA SERIES ELECTRIC CONVECTION STEAMERS - SERVICE UPDATES
Page 5 of 75 F35453 Rev. A (0119)

GENERAL
INTRODUCTION
This manual is applicable to the models and ML
numbers listed on the cover page. Procedures apply
to all models unless specified otherwise.
Steam Cooking
Convection steamers offer an efficient way to
produce many foods in either small portions or
larger batches. 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
atmospheric steaming compartment allows the
operator to open and close the door anytime
during a cooking cycle. The generator heating
elements will shut off when the door is opened
then re-start when the door is closed.
MODELS COVERED
Model Designations (based on 2.5 inch pan
depth)
C24EA6 - Six pan (3 pans per compartment)
C24EA10 - Ten pan (5 pans per compartment)
SPECIFICATIONS
All C24EA steamers, with exception of 480V
steamers, are shipped pre-wired for 208/60/3
operation. Steamer heating element wiring change is
required if connecting to 208/60/1, 240/60/1 or
240/60/3 electrical service.
ELECTRICAL SPECIFICATIONS
Volts Phase
C24EA6 C24EA10
Total
KW Amps Total KW Amps
208 1 16.9 81 25.6 121
240 1 19.0 79 25.6 110
208 3 16.9 48 25.2 72
240 3 19.0 51 25.6 67
480 3 17.2 21 25.6 32
NOTES:
1. Voltage values are @ 60HZ.
ELECTRICAL SPECIFICATIONS
Volts Phase
C24EA6 C24EA10
Total
KW Amps Total KW Amps
2. Heating elements on three phase machines are
not wired as a balanced load. The amps listed
are the maximum on any leg.
3. Total KW and amps include heat exchanger
elements.
WATER SUPPLY REQUIREMENTS
Supply pressure should
be 20-60 psig
In line strainer for supply
line (Supplied)
Total dissolved solids
(TDS) * less than 60 ppm
Total alkalinity less than 20 ppm
Silica less than 13 ppm
Total Chloride less than 4.0 ppm
PH factor 6.5 to 8
Undissolved Solids less than 5 microns
* 17.1 ppm = 1 grain of hardness
Water hardness below 4 grains/gal requires water
treatment to reduce potential corrosion. Hardness
above 6 grains/gal should be treated by water
conditioner, water softener or in-line treatment.
Water Conditioning
It is recommended that a local water treatment
specialist be consulted before the installation of
any steam generating equipment.
Furnishing the steam generator with properly
conditioned water to reduce scale formation is
important. Scale formation will reduce steam
output, cause premature component failure and
shorten equipment life. Most water supplies
contain scale producing minerals such as
calcium and magnesium. As steam is generated,
the minerals remain and dissolve into the
remaining water. As the concentration of these
minerals increases past a certain point, they
precipitate from the water and coat the inside of
C24EA SERIES ELECTRIC CONVECTION STEAMERS - GENERAL
F35453 Rev. A (0119) Page 6 of 75

the steam generator, heating elements,
thermostat bulbs and water level probes.
Because of the high temperature of these
surfaces, the precipitated minerals bake onto
them and become very difficult to remove.
This phenomenon causes several problems:
1. Reduces the heat transfer efficiency of
heating elements.
2. Causes premature failure of heating
elements.
3. Water level probes will give false readings.
4. Temperature sensing bulbs will sense
temperature incorrectly.
These problems are common to any manufacturer's
steamer regardless of design, but they can all be
prevented by furnishing the steam generator with
properly conditioned water. Vulcan recommends the
water contain less than 60ppm of total dissolved solids
(TDS) and have a PH factor between 6.5 to 8.
Other chemical properties in water supplies can also
affect good steam generation and vary from within
each state and locality.
The water level probes in the steam generator use
ions in the water to detect the water level. Do not use
fully demineralized or de-ionized water since it is non-
conductive and the water level can not be detected.
NOTE: The use of strainers, or filters will not remove
minerals from the water.
Steamers that operate over a long period of time
without the benefit of properly conditioned water, and
have developed a heavy scale build up, should be
cleaned before connecting to a conditioned water
supply.
REFERENCE MATERIAL
For replacement parts, refer to Catalog of
Replacement Parts F35454.
For operation, cleaning and maintenance instructions,
refer to Installation and OPERATION MANUAL
F35430.
LUBRICATION
Component Lubrication Type
All NPT Fittings Pipe Thread Sealant,
Loctite 565
Door Handle Sliding
Bracket Lubriplate 630AA
TOOLS
• Standard set of hand tools.
• VOM with A/C current tester (any quality VOM
with a sensitivity of at least 20K ohms per volt can
be used).
• Anti Static Kit, Part No. TL - 84919.
Special
• Torque Wrench - Capable of measuring 70 in-lbs.
• Aluminum Foil Tape - (McMaster-Carr Part No.
7631A21) or equivalent.
• Single use Constant Tension Band Clamps for
the specific hose size being used. Refer to parts
catalog for part number.
• Pressure Gauge Assembly
• Low Pressure Gauge - 0 to 5 psi.
recommended (Grainger Part No. 2C641).
• Water Hose Coupling - swivel type
(Grainger Part No. 4KG87).
• Reducer Bushing (Grainger Part No.
1DGF2).
• Pipe thread sealant (as required).
Fig. 1
C24EA SERIES ELECTRIC CONVECTION STEAMERS - GENERAL
Page 7 of 75 F35453 Rev. A (0119)

COVERS AND PANELS
FRONT BASE PANEL
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Remove screws from the bottom of panel.
Fig. 2
2. Pull bottom of panel out and slide down to clear
tabletop cover.
3. Reverse procedure to install.
RIGHT AND LEFT SIDE BASE
PANELS
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
NOTE: Removal of left side panel is identical to the
procedure for the right side panel.
1. Remove FRONT BASE PANEL.
2. Remove screws from the bottom of panel.
Fig. 3
3. Pull bottom of panel out and slide down to clear
tabletop cover.
4. Reverse procedure to install.
REAR BASE PANEL
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Remove electrical power connection to machine.
2. Turn off water supply and disconnect plumbing to
machine.
3. Remove screws securing water valves to panel.
4. Remove screws from the bottom of panel.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - COVERS AND PANELS
F35453 Rev. A (0119) Page 8 of 75

Fig. 4
5. Pull bottom of panel out and slide down to clear
tabletop cover.
6. Reverse procedure to install.
COOKING COMPARTMENT RIGHT
AND LEFT SIDE PANELS
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
NOTE: Removal of left side panel is identical to the
procedure for the right side panel.
1. Remove screws from the bottom of panel.
Fig. 5
2. Pull bottom of panel out and slide down to clear
top cover.
3. Reverse procedure to install.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - COVERS AND PANELS
Page 9 of 75 F35453 Rev. A (0119)

DOOR
REMOVAL
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Close door.
2. Remove COOKING COMPARTMENT LEFT
SIDE PANEL as outlined under Coversand
Panels.
3. Remove nuts from upper hinge located inside
front panel.
Fig. 6
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. Reassemble parts removed in reverse order.
8. Check door for fit and proper sealing of gasket.
GASKET
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Open door.
2. Remove the shoulder screws and pan pusher
bracket from gasket plate.
Fig. 7
3. Remove gasket plate.
4. Remove gasket from inner door panel.
5. Remove RTV from bottom part of inner door
panel. Apply RTV 109 to bottom of door where
shown when assembling gasket to door.
Fig. 8
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.
DOOR HANDLE
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
Removal
1. Open door.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - DOOR
F35453 Rev. A (0119) Page 10 of 75

2. Remove screws from top and bottom of door
assembly.
Fig. 9
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.
Fig. 10
4. Remove lock nuts and stepped spacers from
threaded studs of door 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.
Fig. 11
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.
7. Align the top and bottom screw holes of outer
door housing with inner door panel.
Fig. 12
8. Install screws to secure door halves together.
Apply Loctite 242 to threads of screws before
assembly.
9. Check opening and closing operation of door.
LATCH ASSEMBLY
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
Removal and Disassembly
C24EA SERIES ELECTRIC CONVECTION STEAMERS - DOOR
Page 11 of 75 F35453 Rev. A (0119)

1. Separate outer door housing assembly from
inner door panel as outlined under DOOR
HANDLE.
2. Remove screws securing latch assembly to inner
door panel and remove latch mechanism.
Fig. 13
3. Remove E-clip from latch assembly pins and pull
pins from latch mechanism.
Fig. 14
4. Remove retaining pin from spring pin.
5. Separate sliding bracket from stationary bracket.
Fig. 15
Assembly
1. Apply Lubriplate 630AA to sides of sliding
bracket.
2. Insert spring pin into bottom of sliding bracket. A.
Place spring over spring pin.
3. Assemble sliding bracket into stationary bracket.
4. While holding head of spring pin against bottom
of sliding bracket, insert spring pin into keeper
hole in bottom of stationary bracket.
Fig. 16
A. Secure spring pin in place with retaining pin.
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.
A. Secure pins into position with E-clip.
Installation
1. Install latch assembly onto inner door panel with
spring pin toward bottom of door panel.
A. Apply Loctite 271 to threads of screws
before assembly and secure latch assembly
to inner door panel.
Fig. 17
C24EA SERIES ELECTRIC CONVECTION STEAMERS - DOOR
F35453 Rev. A (0119) Page 12 of 75

2. Install outer door housing assembly as outlined
under DOOR HANDLE.
3. Check opening and closing operation of door.
4. Check steamer for proper operation and leaks
around door seal.
HINGE BEARINGS
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Close door.
2. Remove COOKING COMPARTMENT LEFT
SIDE PANEL as outlined under Covers and
Panels.
3. Remove nuts from upper hinge located inside
front panel.
Fig. 18
4. Open door slightly, and while holding door, pull
upper hinge away from front panel.
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.
Do not drive bearing into place. The inner door panel
could be damaged. Press bearing into position.
NOTE: When replacing door hinge bearings, replace
both hinge bearings.
9. Position replacement hinge bearing over hinge
opening in door assembly.
A. Press hinge bearing fully into door assembly
using a C-clamp or equivalent.
10. Reassemble parts removed in reverse order.
11. Check door for fit and proper door gasket sealing.
DOOR LATCH ADJUSTMENT
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
Opening a Jammed Door
Should the steamer door jam and cannot be opened,
do not force or pry the door as damage will occur.
1. Lift up on bottom of door at the handle end to
disengage latch.
A. If door does not open, remove COOKING
COMPARTMENT RIGHT SIDE PANEL as
outlined under Covers and Panels.
B. Locate the striker that catches on door latch
near steam chamber on front panel.
Fig. 19
C. Remove the nut from striker and this should
release it from the panel.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - DOOR
Page 13 of 75 F35453 Rev. A (0119)

Fig. 20
D. Open door.
2. Remove striker.
3. Remove any burrs on striker that may cause 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.
Adjustment
1. Reinstall striker with slot pointing upward and
hand tighten nut only.
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.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - DOOR
F35453 Rev. A (0119) Page 14 of 75

THERMOSTAT AND HIGH LIMITS
HEAT EXCHANGER HIGH LIMIT
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Turn off machine to drain steam generator. Allow
steamer to complete drain cycle.
2. Remove RIGHT SIDE BASE PANEL as outlined
under COVERS AND PANELS.
3. Disconnect electrical lead wires from heat
exchanger high limit.
4. Loosen hose clamps securing heat exchanger
high limit to the heat exchanger surface.
Fig. 21
5. Remove heat exchanger high limit.
Fig. 22
6. Reassemble parts removed in reverse order.
7. Check steamer for proper operation.
STEAM GENERATOR HIGH LIMIT
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
Removal
1. Turn off machine to drain steam generator. Allow
steamer to complete drain cycle.
A. Turn off water supply.
2. Remove FRONT BASE PANEL as outlined
under Covers and Panels.
3. Remove heating element (1HTR) from steam
generator as outlined under HEATING
ELEMENTS AND CONTACTORS.
4. Fully loosen capillary tube compression nut and
slide it away from heating element.
5. Remove capillary tube mounting nut from heating
element mounting plate.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - THERMOSTAT AND HIGH LIMITS
Page 15 of 75 F35453 Rev. A (0119)

Fig. 23
6. Disconnect electrical wiring to high limit.
7. Remove high limit from the rear of low voltage
control box.
Fig. 24
8. Remove capillary tube from heating element.
Installation
1. Route capillary bulb through the opening in
heating element mounting plate. Ensure there
are no sharp bends in capillary tubing while
installing.
A. Insert capillary bulb into the holding tube on
heating element.
2. Apply pipe thread sealant to threads then install
large capillary tube mounting nut.
A. Ensure capillary bulb is centered in the
holding tube. Tighten the capillary tube
compression nut.
Fig. 25
3. Install heating element with a new gasket.
Torque mounting nuts to 70 in-lbs and tighten
using an alternating pattern.
4. Secure high limit to low voltage control box then
coil excess capillary tube length near the high
limit.
5. Check steamer for proper operation and leaks
around heating element gasket and high limit
capillary tube nuts.
CONDENSATE THERMOSTAT
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Turn off machine to drain steam generator. Allow
steamer to complete drain cycle.
A. Turn off water supply.
2. Remove RIGHT SIDE BASE PANEL as outlined
under Covers and Panels.
3. Disconnect electrical wiring to condensate
thermostat.
4. Remove condensate thermostat from the rear of
drain box.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - THERMOSTAT AND HIGH LIMITS
F35453 Rev. A (0119) Page 16 of 75

Fig. 26
5. Reassemble parts removed in reverse order.
Apply pipe thread sealant to threads of
thermostat before assembly.
6. Check steamer for proper operation and leaks
around condensate thermostat.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - THERMOSTAT AND HIGH LIMITS
Page 17 of 75 F35453 Rev. A (0119)

TIMERS
REMOVAL AND REPLACEMENT
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
NOTE: When the timer reaches zero, an external
buzzer will sound and steam will stop entering the
cooking compartment. The constant steam setting
allows for continuous steam operation.
1. Remove COOKING COMPARTMENT RIGHT
SIDE PANEL as outlined under Covers and
Panels.
2. Note electrical connections then disconnect
wiring from timer being serviced.
Fig. 27
3. Pull knob from timer shaft.
A. Remove rotary shaft seal from timer shaft
then remove timer from front panel.
B. Inspect rotary shaft seal. Replace if
damaged, worn or signs of moisture
migration into control area around timer
shaft is evident.
Fig. 28
4. Reverse procedure to install.
5. Check steamer for proper operation. Upper
compartment shown.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - TIMERS
F35453 Rev. A (0119) Page 18 of 75

HEATING ELEMENTS AND CONTACTORS
REMOVAL AND REPLACEMENT
HEATING ELEMENTS AND
CONTACTORS
Heating Elements
1. Turn off machine to drain steam generator. Allow
steamer to complete drain cycle.
A. Turn off water supply.
2. Remove FRONT BASE PANEL as outlined
under Covers and Panels.
3. Remove top screw securing cover to high voltage
box.
4. Note electrical connections for the heating
element being replaced then disconnect heating
element lead wires from contactors.
Fig. 29
5. Remove mounting nuts and lock washers
securing heating element to steam generator.
Fig. 30
A. If replacing heating element (1HTR),
remove STEAM GENERATOR HIGH
LIMIT.
B. Pull heating element out of steam generator.
6. Reassemble parts removed in reverse order.
Torque mounting nuts to 70 in-lbs and tighten
using an alternating pattern.
NOTE: When installing heating element 2HTR or
3HTR, install pipe plug in the center of heating
element mounting plate. Apply pipe thread sealant to
threads before assembly. Use a new gasket whenever
installing a heating element.
NOTE: Refer to STEAM GENERATOR HIGH LIMIT
for proper placement of capillary bulb.
7. Check steamer for proper operation and leaks
around heating element.
Contactors
1. Turn off machine to drain steam generator. Allow
steamer to complete drain cycle.
2. Remove FRONT BASE PANEL as outlined
under Covers and Panels.
3. Remove top screw securing cover to high voltage
box.
4. Note electrical connections for the contactor
being replaced then disconnect lead wires from
contactor terminals and coil.
5. Remove screws securing contactor to high
voltage control box then remove contactor.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - HEATING ELEMENTS AND CONTACTORS
Page 19 of 75 F35453 Rev. A (0119)

Fig. 31
6. Reassemble parts removed in reverse order.
7. Check steamer for proper operation.
HEATING ELEMENTS DIAGNOSTIC
CHECK
Certain procedures in this section
require electrical test or
measurements while power is
applied to the machine. Exercise
extreme caution at all times and
follow Arc Flash procedures. If test
points are not easily accessible,
disconnect power and follow
Lockout/Tagout procedures, attach
test equipment and reapply power to
test.
1. Check voltage across heating element lead wires
at the limiting and regulating contactor terminals
and verify against data plate.
A. A. If voltage is correct, check current draw
(step 2).
B. If voltage is not correct, check the following:
1) Voltage supply to steamer.
2) Fuses or breaker blown.
3) Power to contactor coils.
4) Contactors not pulling in (mechanical
problem).
2. Check current draw (amps) through heating
element lead wires using an amp clamp meter.
NOTE: Checking current draw is the preferred
method over a resistance check when an amp clamp
meter is available.
A. If current is correct, then heating element is
ok. See table for proper values.
B. If current is not correct, turn power switch off
and disconnect power to machine.
1) Install a replacement heating element.
3. If unable to check current draw, a resistance
check may indicate a malfunctioning element.
A. Turn power switch off and disconnect power
to machine.
B. Disconnect heating element lead wires and
check the individual element resistance
using a VOM.
C. If resistance readings are not correct,
replace heating element.
4. Check steamer for proper operation.
KW, CURRENT AND RESISTANCE PER
ELEMENT
VOLTAGE KW CURRENT RESISTANCE
(OHMS)
208 a8.0 12.8 16.2
240 a10.5 14.8 16.2
480 b8.0 9.6 28.8
208 a8.0 12.8 16.2
240 a10.5 14.8 16.2
480 b8.0 9.6 28.8
a Dual voltage elements.
b 480V elements are connected in Wye
configuration for 277V across each element.
NOTE: Values in table are nominal. Tolerance is ±10
%.
C24EA SERIES ELECTRIC CONVECTION STEAMERS - HEATING ELEMENTS AND CONTACTORS
F35453 Rev. A (0119) Page 20 of 75