Vulcan Hart Electric Steamer C24EA3 208 240V BASIC User Manual

SERVICE MANUAL

C24EA SERIES

ATMOSPHERIC

STEAMERS

C24EA3 208/240V PRO

C24EA3 480V PRO

C24EA5 208/240V PRO

C24EA5 480V PRO

C24EA3 208/240V BASIC

C24EA3 480V BASIC

C24EA5 208/240V BASIC

C24EA5 480V BASIC

ML-136037

C24EA3 BASIC SHOWN

ML-136044

ML-136038

ML-136047

ML-136043

ML-136045

ML-136046

ML-136048

- NOTICE -

This Manual is prepared for the use of trained Vulcan Service

Technicians and should not be used by those not properly

qualified. If you have attended a Vulcan Service School for this

product, you may be qualified to perform all the procedures

described in this manual.

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.

Reproduction or other use of this Manual, without the express

written consent of Vulcan, is prohibited.

For additional information on Vulcan-Hart Company or to locate an authorized

parts and service provider in your area, visit our website at www.vulcanhart.com

A product of VULCAN-HART

LOUISVILLE, KY 40201-0696

F25213 (May 2006)

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MODEL C24EA - GENERAL

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

Atmospheric steamers offer an efficient way to produce many foods in either small portions or larger batches.

Atmospheric 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 element 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)

C24EA3 Three pan - Basic or Professional

C24EA5 Five pan - Basic or Professional

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MODEL C24EA - GENERAL

SPECIFICATIONS

NOTE: All C24EA steamers, with exception of 480V steamers, are shipped pre-wired for 208/60/3 operation.

Steamer heating element wiring connection change is required if connecting to 208/60/1, 240/60/1 or 240/60/3

electrical service.

ELECTRICAL SPECIFICATIONS

AMPERAGE

3 PHASE

240V

1 PHASE

TOTAL

MODEL

Hz.

208V

480V

208V 240V

C24EA3 - Basic

C24EA5 - Basic

C24EA3 - Pro

C24EA5 - Pro

8.5

50/60 26.5 26.5 17.7 20.5 20.5 20.5 10.3 10.3 10.3 40.9 35.4

50/60 46.8 46.8 31.2 36.1 36.1 36.1 18.0 18.0 18.0 72.1 62.5

50/60 26.5 28.9 20.0 20.5 23.2 23.2 10.2 11.6 11.6 43.6 38.5

15.0

9.25

15.75 50/60 46.8 49.2 33.6 36.1 38.8 38.8 18.0 19.4 19.4 74.8 65.6

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

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 the tank, 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 the heaters.

2. Causes premature failure of the heaters.

3. Water level probes will give false readings.

4. Thermostat 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 tank 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.

F25213 (May 2006)

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MODEL C24EA - GENERAL

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 tank 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, which have

developed a heavy scale build up, should be cleaned before connecting to a conditioned water supply.

•

Pressure Gauge Assembly

REFERENCE MATERIAL

•

Low Pressure Gauge - 0 to 5 psi.

recommended (Grainger Part No. 2C641).

For replacement parts, refer to Catalog of

Replacement Parts F-43123.

Water Hose Coupling - swivel type

(Grainger Part No. 4KG87).

For operation, care and cleaning instructions, refer to

Installation and Operation Manual F-35428.

Reducer Bushing (Grainger Part No.

6MN61).

LUBRICATION

Pipe thread sealant (as required).

Component

Lubrication Type

Heating Element

Screws

Never Seez

All NPT Fittings

Pipe Thread Sealant, Loctite

565

Door Handle

Lubriplate 630AA

Sliding Bracket

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*lb.

•

Aluminum Foil Tape - (McMaster-Carr Part No.

7631A21) or equivalent.

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MODEL C24EA - COVERS AND PANELS

COVERS AND PANELS

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

RIGHT AND LEFT SIDE PANELS

TOP COVER

1. Remove RIGHT AND LEFT SIDE PANELS.

NOTE: Removal of left side panel is identical to the

procedure for the right side panel.

2. Remove the screws securing top cover to rear

panel.

1. Remove screws from the bottom of panel being

removed.

3. Remove the screws securing top cover to front

panel. Screws are located on either side of the

cooking cavity.

2. Pull bottom of panel out and slide down to clear

top cover.

4. Disconnect the delime hose from delime port

fitting.

3. Reverse procedure to install.

RIGHT SIDE SHOWN

5. Lift top cover off machine.

6. Reassemble parts removed in reverse order.

7. Check machine for proper operation.

F25213 (May 2006)

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MODEL C24EA - COVERS AND PANELS

REAR PANEL

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove screws securing top cover to rear

panel and rear panel to steamer frame.

SCREW LOCATION

NOTE: If incoming plumbing or drain interferes with

rear panel removal, turn off water supply and

disconnect plumbing to machine.

2. Remove LEFT SIDE PANEL.

3. Disconnect vacuum relief hose from fitting.

TOP COVER REMOVED FOR CLARITY

4. Pull bottom of rear panel away from machine

and plumbing.

5. Reassemble parts removed in reverse order.

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MODEL C24EA - DOOR

DOOR

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

REMOVAL

GASKET

1. Close door.

1. Open door.

2. Remove LEFT SIDE PANEL as outlined in

COVERS AND PANELS.

2. Remove the shoulder screws and pan pusher

bracket from gasket plate.

3. Remove nuts from upper hinge located inside

front panel.

3. Remove gasket plate.

4. Open door slightly, and while holding door, pull

upper hinge away from front panel.

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.

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.

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.

F25213 (May 2006)

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MODEL C24EA - DOOR

Installation

DOOR HANDLE

1. Apply Lubriplate 630AA around slots of outer

door housing where step spacers contact

housing.

Removal

1. Open door.

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.

2. Remove screws from top and bottom of door

assembly.

3. Install step spacer with smaller radius toward

handle and door housing. Smaller radius is a

slip fit with outer door housing slot.

3. Pull outer door housing away from inner door

panel starting at the hinge side of door to

separate the door halves.

4. Install lock nuts and tighten until no gap exists

between handle, step spacer and lock nut. Do

not over-tighten lock nuts.

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.

5. Close inner door panel so that latch mechanism

engages striker on front panel.

4. Remove lock nuts and stepped spacers from

threaded studs of door handle.

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.

8. Apply Loctite 242 to threads of screws before

assembling.

9. Install screws to secure door halves together.

10. Check opening and closing operation of door.

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MODEL C24EA - DOOR

Assembly

LATCH ASSEMBLY

1. Apply Lubriplate 630AA to sides of sliding

Removal and Disassembly

bracket.

1. Separate outer door housing assembly from

inner door panel as outlined under DOOR

HANDLE.

2. Insert spring pin into bottom of sliding bracket.

A. Place spring over spring pin.

3. Assemble sliding bracket into stationary

bracket.

2. Remove screws securing latch assembly to

inner door panel and remove latch mechanism.

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 E-clip from latch assembly pins and

pull pins from latch mechanism.

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.

4. Remove retaining pin from spring pin.

5. Separate sliding bracket from stationary

bracket.

F25213 (May 2006)

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MODEL C24EA - DOOR

2. Install outer door housing assembly as outlined

A. Press hinge bearing fully into door

assembly using a C-clamp or equivalent.

in DOOR HANDLE.

3. Check opening and closing operation of door.

10. Reassemble parts removed in reverse order.

4. Check steamer for proper operation and leaks

around door seal.

11. Check door for fit and proper door gasket

sealing.

HINGE BEARINGS

DOOR LATCH ADJUSTMENT

Opening a Jammed Door

1. Close door.

CAUTION: Should the steamer door jam and

cannot be opened, DO NOT FORCE OR PRY the

door as damage will occur.

2. Remove LEFT SIDE PANEL as outlined in

COVERS AND PANELS.

3. Remove nuts from upper hinge located inside

front panel.

1. Lift up on bottom of door at the handle end to

disengage latch.

A. If door does not open, remove the right

side panel as outlined in RIGHT AND

LEFT SIDE PANELS.

B. Locate the striker that catches on door

latch near steam chamber on front panel.

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.

C. Remove the nut from striker and this

should release it from the panel.

CAUTION: 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.

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.

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MODEL C24EA - DRAIN BOX

4. Once proper slot alignment has been set, hold

Adjustment

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.

1. Reinstall striker with slot pointing upward and

hand tighten nut only.

2. Close door to center striker in front panel

mounting hole.

NOTE: Do not over-tighten nut. If over-tightened,

striker may turn and change alignment.

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.

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.

DRAIN BOX

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

6. Disconnect the steam generator drain hose.

REMOVAL AND REPLACEMENT

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

A. Turn off water supply.

2. Disconnect the drain plumbing from drain box

outlet fitting.

3. Remove the RIGHT AND LEFT SIDE PANELS

as outlined in COVERS AND PANELS.

NOTE: Use plumbing sealant when reinstalling

condensate thermostat.

4. Disconnect the condensate thermostat electrical

wiring.

A. Remove the condensate thermostat from

drain box.

CLOSE-UP FROM RIGHT SIDE OF STEAMER

5. Disconnect the cooling solenoid and cooking

compartment drain hoses.

7. Remove the nuts securing drain box to back

plate at rear of steamer.

8. Remove drain box from steamer.

NOTE: The steam generator drain hose is accessed

from right side of machine.

9. Reassemble parts removed in reverse order.

10. Check steamer for proper operation and leaks

around condensate thermostat and hose

connection points.

F25213 (May 2006)

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MODEL C24EA - COOKING COMPARTMENT

COOKING COMPARTMENT

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

REMOVAL AND REPLACEMENT

NOTE: The cooking compartment and front panel

are constructed as an assembly and cannot be

separated.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

A. Turn off water supply.

2. Remove the RIGHT AND LEFT SIDE PANELS

and TOP COVER as outlined in COVERS AND

PANELS.

3. Remove the DOOR as outlined in HINGE

7. Disconnect the drain hose from rear of cooking

BUSHING.

compartment.

A. Remove both hinges.

4. Remove the timer, indicator light, on/off switch

(Professional models only), striker and door

switch assembly.

NOTE: Screws are located on either side of cooking

compartment securing front panel to lower louvered

panel.

PROFESSIONAL MODEL SHOWN

5. Remove the vacuum breaker and hose as an

assembly.

6. Disconnect steam inlet hose from the steam

inlet port.

A. Remove the steam inlet port.

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MODEL C24EA - COOKING COMPARTMENT

8. Remove the screws securing front panel to

lower louvered panel.

9. Remove the nuts securing rear of cooking

compartment to the vertical mounting brackets

(four places - located between cooking

compartment and steam generator).

10. Remove cooking compartment assembly.

11. If removed or replacing cooking compartment,

install insulation around cooking compartment.

Secure insulation into position using high

temperature aluminum foil tape.

12. Reinstall parts removed in reverse order.

13. Check DOOR LATCH ADJUSTMENT.

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MODEL C24EA - THERMOSTATS

THERMOSTATS

2. Remove RIGHT SIDE PANEL and TOP

HOLD THERMOSTAT

COVER as outlined under COVERS AND

PANELS.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

3. Remove HEATING ELEMENT.

4. Loosen hose clamp securing capillary bulb to

top of heating element.

5. Fully loosen the small capillary tube

compression nut and slide it away from heating

element.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

6. Remove large capillary nut from heater base

plate and slide it away from heating element.

A. Turn off water supply.

2. Remove RIGHT SIDE PANEL as outlined under

COVERS AND PANELS.

3. Disconnect electrical lead wires from hold

thermostat.

4. Remove hold thermostat from steam generator

tank.

7. Remove capillary tube from heating element.

8. Disconnect electrical wiring to high-limit

thermostat.

9. Remove high-limit thermostat from mounting

bracket.

NOTE: Apply Loctite 565 to threads of hold

thermostat before assembly.

5. Reassemble parts removed in reverse order of

removal.

6. Check steamer for proper operation and leaks

around hold thermostat.

HIGH-LIMIT THERMOSTAT

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

Removal

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

A. Turn off water supply.

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MODEL C24EA - THERMOSTATS

Installation

CONDENSATE THERMOSTAT

1. Insert capillary bulb through large compression

nut.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

A. Route capillary bulb through top of heating

element.

B. Position capillary bulb between top of

second and third heating element coils.

Secure with hose clamp to second coil as

shown.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

2. Apply pipe thread sealant to threads of large

capillary nut then install large compression nut.

A. Turn off water supply.

A. Pull excess capillary tubing out of heating

element through large nut. Route capillary

tubing such that there are no sharp bends.

2. Remove LEFT SIDE PANEL as outlined in

COVERS AND PANELS.

3. Disconnect electrical wiring to condensate

thermostat.

B. Tighten the small capillary compression nut

into the large compression nut.

NOTE: Install a new gasket when reassembling

steam generator tank. Temporarily secure gasket in

place with RTV109.

4. Remove condensate thermostat from drain box.

5. Reassemble parts removed in reverse order of

removal. Make certain to apply Loctite 565

thread sealant to threads of thermostat before

assembly.

3. Reinstall remaining parts removed in reverse

order.

4. Torque heating element screws to 70 in*lb

following the heating element tightening

6. Check steamer for proper operation and leaks

around condensate thermostat.

sequence as found under HEATING ELEMENT.

5. Check steamer for proper operation and leaks

around heating element gasket and high-limit

thermostat.

F25213 (May 2006)

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MODEL C24EA - TIMER

TIMER

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

REMOVAL AND REPLACEMENT

NOTE: The basic and professional model steamers

use the same 60 minute timer. When the timer

reaches zero, an external buzzer will sound and

steam will stop entering the cooking compartment.

The Professional steamer has extra components to

utilize the constant steam setting allowing the

steamer to operate continuously.

1. Remove RIGHT SIDE PANEL as outlined under

COVERS AND PANELS.

2. Note electrical connections then disconnect

wiring to timer.

4. Reverse procedure to install.

5. Check steamer for proper operation.

PROFESSIONAL MODEL SHOWN

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.

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MODEL C24EA - HEATING ELEMENT

HEATING ELEMENT

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

6. Pull heating element out of steam generator

REMOVAL AND REPLACEMENT

tank.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

7. Note mounting position of high-limit thermostat

bulb then remove bulb from heating element.

A. Turn off water supply.

A. Remove high-limit capillary tube

compression fitting and remove high-limit

capillary and bulb from heating element.

2. Remove RIGHT SIDE PANEL and TOP

COVER as outlined under COVERS AND

PANELS.

3. Note heating element wire connection points

then disconnect heating element lead wires

from contactors.

NOTE: Install a new gasket when reassembling

steam generator tank. Temporarily secure gasket in

place with RTV109.

BASIC MODEL SHOWN

8. Remove gasket from steam generator tank.

4. Carefully position high-limit thermostat capillary

tube to facilitate heating element removal.

Avoid creating sharp bends or kinks in the

capillary tube.

A. Clean remaining sealant from top lip of

steam generator tank.

NOTE: Refer to HIGH-LIMIT THERMOSTAT for

proper placement of capillary bulb.

5. Remove screws and lock washers securing

heating element to tank.

F25213 (May 2006)

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MODEL C24EA - HEATING ELEMENT

9. Reassemble parts removed in reverse order of removal. Tighten heating element screws evenly to 70 in*lbs.

Follow tightening sequence pattern as shown in illustration.

OVERHEAD VIEW OF HEATING ELEMENT

10. Check steamer for proper operation and leaks around heating element.

DIAGNOSTIC CHECKS

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS

WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. 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 wires at limiting and regulating contactor terminals.

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)

2. Check current draw (amps) through heating element lead wires using an amp clamp meter.

A. If current is correct, then heating element is ok.

B. If current is not correct, check element resistance (step 3).

3. Remove one lead wire of each heating element from the regulating contactor and check the individual

element resistance using a VOM.

A. If resistance readings are not correct, replace heating element.

CURRENT PER

ELEMENT

RESISTANCE PER ELEMENT

(OHMS)

MODEL

VOLTAGE

TOTAL kW

208 ¹

240 ²

480Y/277 ³

8.5

10.2

11.8

10.2

18.0

20.8

18.1

20.4

27.1

11.5

15.3

3 Pan

208

5 Pan

240

480Y/277 ³

Four elements used.

Three elements used.

Elements of 480V machines are connected in Wye configuration for 277V across each element.

NOTE: Values in table are nominal. Tolerance is ±10 %.

4. Check steamer for proper operation.

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MODEL C24EA - SUPER HEATER

SUPER HEATER

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

B. Tape insulation around head of heater

REMOVAL AND REPLACEMENT

element using high-temperature aluminum

foil tape.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

7. Check to make sure insulated piping assembly

is horizontal or element head end of assembly

is slightly elevated.

A. Turn off water supply.

2. Remove RIGHT SIDE PANEL as outlined under

COVERS AND PANELS.

3. Note super heater wiring connection points then

disconnect heating element lead wires from the

relay (K4) and the regulating contactor.

8. Check steamer for proper operation and leaks

around super heater.

4. Peel back insulation from head of heater

element.

9. Reinstall panels and top cover.

5. Remove super heater element from insulated

piping assembly.

NOTE: Top cover removed for clarity. Removal of

top cover is not necessary to service super heater.

6. Reassemble parts removed in reverse order of

removal.

A. Apply pipe thread sealant to threads of

super heater element before assembly.

F25213 (May 2006)

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MODEL C24EA - SUPER HEATER

DIAGNOSTIC CHECKS

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS

WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. 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 super heater wires at limiting and regulating contactor terminals.

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 open.

3) Relay K4.

4) Power to contactor coils.

5) Contactors not pulling in. (Mechanical)

2. Check current draw (amps) through super heater lead wires using an amp clamp meter.

A. If current is correct, then super heater is ok.

B. If current is not correct, check resistance (step 3).

3. Remove one of the super heater lead wires from the regulating contactor and check resistance using a VOM.

A. If resistance is not correct, replace super heater.

VOLTAGE

208/240

480Y/277 ¹

TOTAL kW

0.75

CURRENT

3.1

RESISTANCE (OHMS)

76.8

0.75

2.7

102.3

Elements of 480V machines are connected in Wye configuration for 277V across super heater.

NOTE: Values in table are nominal. Tolerance is ±10 %.

4. Check steamer for proper operation.

Page 21 of 52

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

WATER LEVEL CONTROL COMPONENTS

WATER LEVEL CONTROLS

Low Level Cut-Off & Differential Control

The steamer is equipped with three water level

sensing probes (high, low and low level cut-off) and

a water level control board. The water level control

board performs two functions: 1) Provide low level

cut-off protection to shut off the heat source in case

the water level drops below the low level cut-off

(LLCO) probe. 2) Perform as a differential level

control to maintain the water level between the low

and high water level probes.

The water level control (WLC) board has input

voltage (120VAC) across terminals 11 and 12 which

powers the primary side of the transformer. On one

When the water level drops below the low level (LL)

side of the transformer secondary, power is provided

probe, power is removed from the inverse latching

to the control by a series path through chassis

relay, the HL relay energizes through ILR-2 and HL

ground (terminal 10). The other side of the

contacts change state. The slow fill solenoid is

transformer secondary (12VAC) is attached to the

energized through HL-1 to refill the generator and

probe that directs power to the other side of WLC

the HL LED is lit. The HL relay and LED will toggle

board relay coils (LLCO and HL) and to the inverse

on and off during a cooking cycle as needed.

latching relay (ILR) electronic circuit on the WLC

board. As water enters the generator, it becomes

part of the WLC board circuit. When the water level

in the generator reaches a probe, that circuit is

completed.

The inverse latching relay of the WLC board is de-

energized, leaving the ILR-1 (N.O.) and ILR-2 (N.C.)

contacts in their shelf state.

When the main power switch is turned on, power is

supplied to the WLC board which energizes the high

level (HL) relay, closes HL-1 normally open contacts,

and illuminates the HL relay LED. With the HL-1

contacts closed, the slow fill solenoid is energized

and water begins filling the generator.

When the water level reaches the low level cut-off

(LLCO) probe, the LLCO relay is energized and

illuminates the LLCO LED. With the LLCO-1 contacts

closed, the heat source can be energized provided

the auxiliary control(s) in the heating circuit are

satisfied. The LLCO relay will remain energized and

its LED will stay lit until the water level in the

generator drops below the LLCO probe.

When the water level reaches the low level (LL)

probe, power to terminal 2 on the WLC board is

present but no switching occurs.

After the water level reaches the high level (HL)

probe, the inverse latching relay of the WLC board is

energized and locked through the low level probe

(LL) and ILR-1 contacts. With ILR-2 contacts open,

HL relay is de-energized and the HL LED goes out.

With the HL-1 contacts open, the slow fill solenoid is

de-energized, stopping the flow of water into the

generator.

F25213 (May 2006)

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

WATER LEVEL CONTROL

WATER LEVEL PROBES

BOARD

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove RIGHT SIDE PANEL and TOP

COVER as outlined under COVERS AND

PANELS.

CAUTION: Certain components in this system

are subject to damage by electrostatic discharge

during field repairs. A field service grounding kit

is available to prevent damage. The field service

grounding kit must be used anytime the control

board is handled.

2. Note locations of electrical wiring and

disconnect lead wires to water level probes.

WATER LEVEL PROBE ELECTRICAL

CONNECTIONS

1. Remove RIGHT SIDE PANEL as outlined under

COVERS AND PANELS.

Water Level

Controller

Wiring

Water Level

Probe

2. Squeeze tab on plastic standoff to release

circuit board from standoff. Water level control

board is secured with pins in five locations.

HL - High Level

Probe

# 5 A - Blue

LL - Low Level

Probe

# 6 B - Yellow

LLCO - Low

Level Cut Off

LLCO

# 7 C - Red

# 8 - Green

Ground

A. Disconnect ground wire.

3. Remove probe assembly from piping assembly.

3. Note electrical wiring connection points then

disconnect lead wires from water level control

board (WLC). Refer to the machine wiring

diagram when installing water level control

board.

4. Reassemble parts and wiring removed in

reverse order of removal.

5. Check steamer for proper operation.

NOTE: Probes should be cleaned thoroughly.

Remove all accumulated deposits from insulator

using a soft cloth. Do not use anything abrasive on

insulators. If probes are dirty, delime steam

generator tank after assembling.

NOTE: Apply Loctite 565 to threads of probe

assembly before installation.

4. Reverse procedure to install.

A. Set spacing between probe assembly

flange and reducing Tee between 0.490" to

0.550".

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

DUAL WATER VALVE FLOW RATES

Flow Rate (GPM)

Machine

Type

Valve Type

Fast Flow Slow Flow

Valve

Fill (Filtered

Water)

3 & 5 Pan

4.8

0.15

Condensate

(Non-Filtered

Water)

3 - Pan

5 - Pan

4.8

0.75

1.35

Filtered Water Solenoid Valve

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

NOTE: Perform a steam generator tank cleaning as

outlined under STEAM GENERATOR TANK -

CLEANING.

A. Turn off water supply.

2. Disconnect the incoming filtered water hose to

machine.

FILTERED AND NON-FILTERED

WATER SOLENOID VALVES

3. Remove the REAR PANEL as outlined under

COVERS AND PANELS.

4. Remove the screws securing the solenoid valve

to the back plate.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

NOTE: The filtered and non-filtered water solenoid

valves are constructed as dual water valve

assemblies. To differentiate between the fast and

slow fill valves, hold the dual water valve assembly

with the inlet up and the outlets facing forward. The

fast flow valve is the left valve and the slow flow

valve is the right valve. The two dual assemblies

used on the steamer have different flow rates and

should not be interchanged.

5. Pull solenoid valve toward right side of machine

enough to access electrical connections.

A. Note connection points of electrical wires

then disconnect wires from solenoid valve.

B. Disconnect hoses from solenoid valve then

remove solenoid valve from steamer.

DUAL WATER VALVE

F25213 (May 2006)

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

6. Reassemble parts removed in reverse order of

MANUAL DRAIN VALVE (BASIC)

removal.

7. Verify that the filtered water supply is connected

to the input of the filtered water solenoid valve.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

8. Check steamer for leaks and proper operation.

Non-Filtered Cold Water Solenoid Valve

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

Removal

A. Turn off water supply.

1. Pull out handle to turn off machine and drain

steam generator tank. Allow steamer to

complete drain cycle.

2. Disconnect incoming water hose to non-filtered

cold water solenoid valve.

3. Remove LEFT SIDE PANEL as outlined in

COVERS AND PANELS.

A. Turn off water supply.

2. Remove the RIGHT SIDE PANEL as outlined in

COVERS AND PANELS. Rear panel can also

be removed for added accessibility.

4. Note connection points of electrical connections

then disconnect wiring from solenoid valve.

3. Remove the pin and disconnect the handle

linkage from linkage bracket.

VIEW FROM LEFT SIDE OF STEAMER

5. Remove the screws securing non-filtered cold

water solenoid valve to back plate.

6. Note hose connections to solenoid valve then

disconnect hoses from valve.

4. Remove the on/off switch and bracket as an

assembly.

A. Remove solenoid valve from steamer.

5. Disconnect the drain and drain flush hoses from

the Tee located below the drain valve.

7. Reassemble parts removed in reverse order of

removal.

A. Connect the outputs of the non-filtered

water cooling solenoid to the drain box and

Tee mounted to the drain valve under the

steam generator.

8. Verify that the non-filtered water supply is

connected to the input of the non-filtered water

solenoid valve.

9. Check steamer for leaks and proper operation.

6. Remove the drain valve from the steam

generator tank.

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

A. Rotate knob CW to manually open the

NOTE: Apply pipe thread sealant to plumbing

drain valve. Turning knob such that the slot

in knob is in a vertical orientation indicates

the drain valve is open. If slot in knob is in

a horizontal orientation, the drain valve is

closed.

threads before assembly.

7. Reassemble parts removed in reverse order of

removal.

8. For Basic model steamers, perform ON/OFF

SWITCH ADJUSTMENT as outlined in ON/OFF

SWITCH.

9. Check steamer for leaks and proper operation.

MOTORIZED DRAIN VALVE

(PROFESSIONAL)

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Turn steamer off by using the on/off switch on

the front panel of steamer.

B. Return manual drain override knob to the

closed position (slot in horizontal position).

A. Allow steamer to complete drain cycle.

Removal

B. If motorized drain valve has malfunctioned

such that tank will not drain normally, refer

to Drain Tank Manually for draining

procedure.

1. Turn off water supply to steamer.

2. Remove the RIGHT SIDE PANEL as outlined in

COVERS AND PANELS. Rear panel can also

be removed for added accessibility.

Drain Tank Manually

3. Rotate body of motorized control assembly

CCW approximately 1/8 turn to disengage

assembly from drain valve.

1. Turn off water supply to steamer.

2. Disconnect power to steamer allowing time for

water in steam generator tank to cool to 140EF

before attempting to manually open drain valve.

3. Remove the RIGHT SIDE PANEL as outlined in

COVERS AND PANELS. Rear panel can also

be removed for added accessibility.

4. Locate the motorized drain valve found at lower

right side of steam generator tank.

4. Remove the motorized control assembly.

NOTE: The two electrical plugs on the motorized

control assembly are the same type connector. If the

electrical wiring is not connected correctly, the

motorized drain valve will not function.

A. Note location of electrical connections then

disconnect electrical wiring from motorized

control assembly.

5. Push in on the manual drain override knob to

disengage the gear set.

F25213 (May 2006)

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

5. Disconnect the drain and drain flush hoses from

the Tee located below the drain valve.

6. Remove the drain valve body from the steam

generator tank.

7. Separate the Tee and nipple from the drain

valve body.

8. Reassemble parts removed in reverse order.

Apply liquid pipe thread sealant to threads of

plumbing connections.

NOTE: If motorized drain valve is in the open

position when power is applied to the steamer with

the power switch on, drain valve will not close and fill

water will flow through the generator into the drain.

9. Verify On/Off switch is in the off position and the

motorized drain valve is closed before applying

power to steamer.

NOTE: When power is applied and power switch is

off steamer will enter a drain cycle.

10. Check steamer for proper operation and leaks

around drain valve.

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MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS

SWITCHES, BUZZER AND SOLENOIDS

ON/OFF SWITCH

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

Basic Models

1. Pull out on handle to turn steamer off and drain

generator tank.

2. Remove the RIGHT SIDE PANEL.

3. Locate the on/off switch assembly mounted to

the manual drain valve.

2. Continue pushing handle in until handle is at

physical stop.

A. If switch plunger over-travel range is

between 0.060" - 0.090" once switch N.O.

contacts close, switch setting is correct.

4. Note wiring locations and disconnect electrical

wiring from switch.

B. If contacts did not close, or, there was no

over-travel of switch plunger once contacts

closed, switch position must be adjusted.

Refer to Basic Model On/Off Switch -

Adjustment for procedure.

5. Remove switch from switch mounting bracket.

Retain hardware.

6. Loosely install switch onto switch mounting

bracket.

Basic Model On/Off Switch - Adjustment

7. Perform Basic Model On/Off Switch -

Adjustment as outlined in this section.

1. Position switch mounting bracket on drain valve

in middle of adjustment slot.

8. Connect electrical wiring to switch.

9. Check steamer for proper operation.

A. Tighten switch bracket to drain valve.

Basic Model On/Off Switch - Check Switch

Actuation

NOTE: Handle must be pushed all the way in to

avoid nuisance tripping.

1. Push handle in until switch contacts close. This

can be checked with a meter set to measure

resistance or continuity with meter probes

across the COMMON and NORM OPEN

terminals of switch.

2. Loosen on/off switch mounting screws.

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MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS

3. Push handle fully in and keep in position.

3. Disconnect electrical plug from switch.

4. Remove switch from front panel.

4. Position plunger of on/off switch against linkage

bracket such that plunger is fully engaged.

5. Reassemble parts removed in reverse order.

DOOR SWITCH

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

Removal

1. Remove the RIGHT SIDE PANEL.

2. Open cooking compartment door.

3. Note wiring connections and disconnect

electrical wiring from switch.

A. Adjust switch such that switch plunger is

perpendicular with linkage bracket when

handle is pushed in fully.

4. Remove switch from door switch mounting

bracket. Retain hardware.

Installation

B. Tighten switch mounting screws.

Professional Models

1. Verify E-clip is installed on door switch linkage

in groove nearest front panel (if two grooves in

linkage are present).

1. Remove the RIGHT SIDE PANEL.

2. Locate the on/off switch mounted to the front

panel.

2. Loosely install door switch onto door switch

mounting bracket.

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MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS

A. Close door.

B. Push switch up against switch linkage as

far as possible.

C. Tighten switch mounting hardware.

3. Check door switch operation.

A. Set meter to measure resistance and place

meter leads across the COMMON and

NORM OPEN terminals of switch. With

door closed, meter should indicate a

closed circuit.

B. Open door. Meter should indicate an open

circuit as door is opened.

PROFESSIONAL MODEL SHOWN

3. Disconnect electrical wiring to pressure switch.

4. Check steamer for proper operation.

5. Reinstall RIGHT SIDE PANEL.

4. Remove pressure switch from piping.

5. Reassemble parts removed in reverse order.

PRESSURE SWITCH

A. Apply pipe thread sealant to threads of

pressure switch before installation.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

B. Verify mylar cover is in position covering

electrical connections.

WARNING: CERTAIN PROCEDURES IN THIS

SECTION REQUIRE ELECTRICAL TEST OR

MEASUREMENTS WHILE POWER IS APPLIED TO

THE MACHINE. EXERCISE EXTREME CAUTION

AT ALL TIMES. IF TEST POINTS ARE NOT EASILY

ACCESSIBLE, DISCONNECT POWER AND

FOLLOW LOCKOUT / TAGOUT PROCEDURES,

ATTACH TEST EQUIPMENT AND REAPPLY

POWER TO TEST.

Removal

NOTE: For basic models, the pressure switch can be

accessed by removing the right side panel. It is not

necessary to remove the top cover.

NOTE: Refinement of pressure switch cut out setting

is found under Adjustment. Always check and adjust

pressure switch setting whenever pressure switch is

being serviced.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

C. If pressure switch is being replaced, make

an initial pressure switch setting by aligning

the top surface of adjustment wheel with

the 5 psi reference scale mark on pressure

switch.

A. Turn off water supply.

2. Remove RIGHT SIDE PANEL as outlined in

COVERS AND PANELS. Locate pressure

switch on top of water level probe piping

assembly.

A. If servicing a Professional model, remove

the TOP COVER as outlined in COVERS

AND PANELS.

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MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS

6. Perform pressure switch Check.

B. Wait for full steam production to stabilize.

This is accomplished by allowing

approximately five cycles of fill to occur

once steam is being produced by the

generator tank. Observe LED on water

control board to count cycles.

Check

NOTE: Pressure can be checked with the small air

pocket that exists between the delime port cap and

water level probe housing in the delime hose. Make

certain that no leaks exist in generator tank or

pressure gauge fittings.

NOTE: Operating pressures will vary slightly

between machine being serviced and gauge used.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

C. Observe pressure gauge once steam

begins to be generated. Gauge should

level out at approximately 1.25 to 2.0 psi,

but will oscillate with respect to fill water

entering generator tank.

A. Turn off water supply.

2. Remove RIGHT SIDE PANEL as outlined in

COVERS AND PANELS.

3. Remove cap from delime port and install

pressure gauge.

TYPICAL OPERATING PRESSURE

NOTE: If pressure should rise above 5.0 psi when

performing check, release clamp. Pressure switch is

out of tolerance and must be adjusted. Refer to

Adjustment for procedure.

4. Close cooking compartment door.

5. Mark one tooth of pressure switch adjustment

wheel to aid in identifying position of wheel.

Make a second mark on body of pressure

switch in alignment with mark on adjustment

wheel.

7. While observing pressure gauge, clamp steam

outlet hose closed.

A. Listen for contactors to release indicating

that pressure switch contacts have

opened. Correct range for pressure switch

cut out is between 4.5 to 4.7 psi.

6. Turn steamer on.

A. Set timer for approximately 10 minutes.

B. Release clamp from steam outlet hose.

Listen for switch contacts to close

(contactors will energize).

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MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS

C. Repeat clamping of steam outlet hose a

VACUUM RELIEF SOLENOID

total of three times to find the average cut-

out pressure. Record pressure.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

D. If pressure is outside tolerance (4.5 to 4.7

psi), adjustment is necessary. Refer to

Adjustment.

E. If cut-out pressure is within specifications,

shut off steamer. Allow time for steamer to

drain.

NOTE: The vacuum relief solenoid on Professional

models is positioned with the solenoid coil toward the

cooking chamber away from the super heater. For

Basic models, the vacuum relief solenoid is

positioned with the coil toward the right side of

machine for easier serviceability.

8. Remove test gauge and reinstall delime cap.

Adjustment

1. Allow full steam production to stabilize. This is

accomplished by allowing approximately five

cycles of fill to occur once steam is being

produced by the generator tank. Observe LED

on water control board to count cycles.

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

A. Turn off water supply.

NOTE: Make small incremental adjustments (1/8

turn of toothed adjustment wheel) when adjusting

cut-out pressure. Wear a heat resistant glove when

working near hot surfaces such as when adjusting

pressure switch.

2. Remove RIGHT SIDE COVER as outlined in

COVERS AND PANELS. Locate vacuum relief

solenoid on top of water level probe piping

assembly.

2. Referring to cut-out pressure recorded in Check

procedure, turn adjustment wheel to bring cut-

out pressure into tolerance.

A. From looking down on pressure switch:

1) Turn adjustment wheel CCW to

decrease cut-out pressure.

2) Turn adjustment wheel CW to

increase cut-out pressure.

PROFESSIONAL MODEL SHOWN

3. Disconnect hose from solenoid valve.

4. Disconnect electrical wiring to solenoid coil.

5. Remove retaining clip securing coil to valve

body then remove coil and wavy washer.

CAUTION: Do not force the super heater piping

assembly out of position to make clearance for

vacuum relief solenoid valve body removal.

Damage to generator tank weldment could occur.

B. Check cut-off pressure after making

adjustment. Repeat Check and Adjustment

as necessary until cut-out pressure is

within 4.5 to 4.7 psi.

NOTE: It may be necessary to turn the piping elbow

that connects the vacuum relief solenoid to the water

level piping assembly in order to clear the super

heater piping assembly when removing the valve

body.

6. Remove the valve body from piping assembly.

7. Reassemble parts removed in reverse order.

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MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS

A. Install valve with the inlet (ON) side of

7. Reassemble parts removed in reverse order.

Perform DOOR LATCH ADJUSTMENT as

outlined under DOOR.

valve connected to the back panel port and

the outlet (OFF) side of valve connected to

the water level control plumbing. Apply

liquid thread sealant to threads of piping

before assembly.

BUZZER

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the RIGHT SIDE PANEL.

2. Locate the buzzer which is mounted above the

door switch near the front of steamer.

3. Disconnect electrical wiring from the buzzer and

door switch.

4. Remove door striker.

5. Remove remaining hardware securing door

switch mounting bracket to front panel then

remove door switch mounting bracket, door

switch and buzzer as an assembly.

6. Remove buzzer from door switch mounting

bracket.

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MODEL C24EA - STEAM GENERATOR TANK

STEAM GENERATOR TANK

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

REMOVAL AND REPLACEMENT

1. Turn off machine to drain steam generator tank.

Allow steamer to complete drain cycle.

A. Turn off water supply.

2. Remove the TOP COVER, RIGHT and REAR

PANEL as outlined under COVERS AND

PANELS.

3. Disconnect electrical wiring then remove HOLD

THERMOSTAT.

4. Disconnect the fill union fitting.

7. Disconnect steam outlet hose from tank fitting

or super heater fitting (super heater on

Professional model only).

8. Remove HEATING ELEMENT.

NOTE: It is not necessary to disconnect the electrical

wiring to the motorized drain valve in order to

remove the motor section of valve.

5. Remove the drain valve controlling mechanism.

A. For Pro models, refer to MOTORIZED

PROFESSIONAL MODEL SHOWN

DRAIN VALVE and remove the motor

section of valve.

9. If Pro model, disconnect the super heater

B. For Basic models, refer to MANUAL

DRAIN VALVE and disconnect the linkage

from valve. Remove the on/off power

switch and bracket as an assembly.

electrical wiring.

A. Remove the super heater element and

super heater housing as an assembly at

the top machined elbow.

NOTE: Water level probe assembly is to be removed

from the steam generator tank once the steam

generator is removed from the steamer.

6. Disconnect the drain flush solenoid hose and

drain hose from the Tee located below the drain

valve.

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MODEL C24EA - STEAM GENERATOR TANK

10. Remove remaining steam outlet elbow plumbing

18. Reinstall parts removed in reverse order of

removal. Apply liquid thread sealant to all pipe

threads connected to the steam generator tank.

Do not apply thread sealant to fill union fitting.

from steam generator tank.

19. Torque heating element screws to 70 in*lb

following the heating element tightening

sequence as found under HEATING ELEMENT.

20. Check steamer for proper operation. Inspect

inlets/outlets and gasket seal of steam

generator tank for leaks.

11. Remove delime hose from water level probe

assembly.

12. Remove hose from the vacuum relief solenoid.

13. Note wiring connection points and remove the

electrical wires from the VACUUM RELIEF

SOLENOID, WATER LEVEL PROBES and

PRESSURE SWITCH.

NOTE: Install a new gasket when reassembling

steam generator tank. Temporarily secure gasket in

place with RTV109.

14. Remove gasket from steam generator tank.

A. Clean remaining sealant from top lip of

steam generator tank.

15. Remove hardware securing steam generator

tank to machine frame (three places) then

remove tank from machine.

16. Remove water level probe assembly from tank.

17. If removed or replacing generator tank, install

insulation around generator tank. Secure into

position using high temperature aluminum foil

tape.

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MODEL C24EA - ELECTRICAL OPERATION

ELECTRICAL OPERATION

COMPONENT FUNCTION

Water Level Control (WLC) Board . . . . . . . . . Controls water level by monitoring conditions of the three water

level probes H, L and LLCO.

Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Creates audible signal when timed cook cycle is complete.

Contactor, Limiting . . . . . . . . . . . . . . . . . . . . . Connects one side of heating elements to incoming power.

Energized whenever WLC (LLCO) coil is energized.

Contactor, Regulating . . . . . . . . . . . . . . . . . . . Connects one side of heating elements to power. On constantly

during cooking cycle.

Drain Valve, Motorized (Ball type) . . . . . . . . . . (Professional models only) Motorized control for opening and

closing drain valve.

Element, Heating . . . . . . . . . . . . . . . . . . . . . . . Located in steam generator tank. Heats water to produce steam.

Element, Super-heater . . . . . . . . . . . . . . . . . . . (Professional models only) Located in piping from steam

generator tank to cooking chamber. Provides additional energy

to raise steam temperature.

Fuse, (1FU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slow blow 4A fuse. Located on primary side of main

transformer. Protects control circuitry from over-currents.

Fuse, (2FU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slow blow 4A fuse. Located on primary side of main

transformer. Protects control circuitry from over-currents.

Lamp (3LT), Power . . . . . . . . . . . . . . . . . . . . . Amber (AM) colored lamp. On when power switch is on.

Lamp (2LT), Cook . . . . . . . . . . . . . . . . . . . . . . Red (RD) colored lamp (Professional models only). On when

hold thermostat is satisfied and door is closed and timer is set.

Lamp (1LT), Ready . . . . . . . . . . . . . . . . . . . . . Green (GN) colored lamp (Professional models only). On when

cycling thermostat is satisfied. Latches on when hold thermostat

is satisfied.

Probe (H) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High water level probe connected to internal latch relay circuit.

Water must reach this level before internal latch relay is

energized.

Probe (L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low water level probe connected to internal latch relay circuit.

Probe (LLCO) . . . . . . . . . . . . . . . . . . . . . . . . . . Low Level Cut-Off (LLCO) probe. Controls power to heating and

timer circuitry. Controls fast fill solenoid (Professional models

only).

Relay (K1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlled by hold thermostat. Enables timer circuit.

Relay (K2), LLCO . . . . . . . . . . . . . . . . . . . . . . . Low Level Cut-Off (LLCO) external relay. Only energized during

drain. Controls Flush, Fast Fill and Vacuum Relief solenoids.

Relay (K3), Drain Relay . . . . . . . . . . . . . . . . . . Controlled by Time Delay Relay. Only energized during drain

cycle. Controls WLC board and LLCO relay K2 during drain.

Disables heating and timer circuitry.

Relay (K4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (Professional models only) Latches Ready light on. Allows

power to superheater.

Relay, Time Delay . . . . . . . . . . . . . . . . . . . . . . Controlled by the power switch. Output becomes active for 90

seconds when power switch is turned to off. Only used during

drain cycle.

Solenoid (1SOL), Cooling . . . . . . . . . . . . . . . . Controlled by the condensate thermostat. Mixes cold water with

hot condensate water from cooking chamber to reduce water

temperature at drain.

Solenoid (2SOL), Flush . . . . . . . . . . . . . . . . . . On only during drain cycle. Mixes cold water with tank water

before entering drain box. Keeps drain hose clear of debris.

Solenoid (3SOL), Fast Fill . . . . . . . . . . . . . . . . Initial tank fill for Professional machines. Used during last stage

of drain cycle to flush drain opening free of debris.

F25213 (May 2006)

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MODEL C24EA - ELECTRICAL OPERATION

Solenoid (4SOL), Slow Fill . . . . . . . . . . . . . . . Primary fill for Basic machines and secondary fill for

Professional machines. Energized as necessary during

operation to replenish water in generator tank.

Solenoid (5SOL), Vacuum Relief . . . . . . . . . . . Provides open air line for vacuum relief during drain cycle to

prevent cooking chamber flex.

Switch (1S), Power . . . . . . . . . . . . . . . . . . . . . Rocker switch on Professional machines and linkage activated

plunger switch on Basic machines. Two position switch that

controls machine steam and drain operations.

Switch (2S), Door . . . . . . . . . . . . . . . . . . . . . . . Plunger activated, switch is wired in series with timer. When

switch is closed and timer is set to a time or constant, regulating

contactor will be energized 100% of the time once ready light is

on (hold thermostat satisfied).

Switch (1PAS), Pressure . . . . . . . . . . . . . . . . . Pressure cut-out protection. Range is between 4.5 to 4.7 psi.

Cuts off electrical energy to controls circuit if pressure is above

set pressure.

Thermostat (1TAS), Condensate . . . . . . . . . . Monitors temperature of water entering the facility drain system.

Controls the cooling solenoid during cooking operation and the

cooling and flush solenoids during drain cycle (135E F cut-in).

Thermostat (2TAS), High-Limit . . . . . . . . . . . Protects against heating element over-temperatures generally

caused by tank boiling dry. Capillary style device. Bulb is

mounted directly to the heating element and body is bracket

mounted to frame rail (257E F cut-out).

Thermostat (3TAS), Hold . . . . . . . . . . . . . . . . Controls temperature of water in steam generator tank to 195EF

(closes at 195E F).

Timer (1TR) . . . . . . . . . . . . . . . . . . . . . . . . . . . Used for timed cook cycles from 0 to 60 minutes. Professional

models have a CONSTANT position for continuous steam

operation.

Transformer (1T), Main . . . . . . . . . . . . . . . . . . Step down transformer from line voltage to control voltage level

(120VAC).

Transformer (2T), Drain . . . . . . . . . . . . . . . . . (Professional models only) Provides 24VAC for motorized drain

valve during drain cycle.

Page 37 of 52

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MODEL C24EA - ELECTRICAL OPERATION

COMPONENT LOCATION

Electrical Control Panel

NOTE: Relay K4 and transformer T2 are present on Professional models only.

F25213 (May 2006)

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MODEL C24EA - ELECTRICAL OPERATION

Water Level Control Board

Page 39 of 52

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MODEL C24EA - ELECTRICAL OPERATION

Front Panel

F25213 (May 2006)

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MODEL C24EA - ELECTRICAL OPERATION

Steam Generator and Back Panel

Page 41 of 52

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MODEL C24EA - ELECTRICAL OPERATION

A. Internal latching relay (ILR) coil on WLC

SEQUENCE OF OPERATION

board energizes.

Refer to the correct wiring diagram for model being

serviced when reviewing sequence of operation.

B. High level (HL) coil de-energized by ILR-2

contacts opening.

NOTE: If power switch is set to off when service

voltage is applied, steamer will enter the timed drain

cycle.

C. Slow fill solenoid de-energized by opening

of HL contacts on WLC board.

8. Tank water reaches 195E F. Hold thermostat

Basic Model

contacts close.

1. Conditions

A. Relay K1 energizes. Timer circuit is

enabled through closure of N.O. contacts

K1-5/3 and K1-6/4.

A. Steamer connected to correct voltage.

1) 120VAC present across X1 & X2 on

secondary side of main transformer.

B. Temperature in tank is maintained at

195E F by hold thermostat control of

regulating contactor through relay contacts

K1-1/5.

B. Steamer connected to water supply with

correct water requirements.

C. Power switch is off (drain handle pulled

out).

9. Timer knob set to time other than zero.

A. Timer motor energized through closure of

N.O. contacts K1-6/4 when time set is

greater than zero. Door switch closure

allows 120VAC across timer wires 18 & 19.

Timer counts down from set time.

1) Time delay relay timed out. Timer has

no output on terminal 1.

D. Condensate thermostat is open.

E. High limit thermostat closed.

F. Pressure switch is closed.

G. Hold thermostat open.

B. Tank temperature maintained by control of

regulating contactor coil through N.O.

contacts K1-6/4 and (Timer -1/3, door

switch, K1-5/3).

H. Drain open and steam generator tank

(referred to as tank) is empty.

10. Steamer door is closed.

Steamer door open.

A. Regulating contactor remains energized as

long as time remains on Timer and door is

closed.

J. Timer is off.

K. Water level control (WLC) and tank

properly grounded.

1) Heating element energized

continuously.

2. ON/OFF lever pushed in.

11. Temperature of condensate exiting cooking

A. Manual linkage closes drain valve and

operates power switch.

cavity increases to above 135EF.

A. Condensate thermostat closes energizing

cooling solenoid 1SOL. Condensate is

cooled in drain box before entering facility

drain system.

1) N.O. contacts close.

B. Amber power light illuminates.

C. X1 potential to L1 of WLC board.

12. Door opened during timed cook cycle.

1) 120VAC across L1 & L2 of WLC

board.

A. Timer continues count down until time

equals zero even if steamer door is

opened.

2) High level coil (HL) energized on WLC

board. HL LED on WLC board lights.

B. Regulating contactor de-energized until

3. Slow fill solenoid energized through closure of

HL contacts. Tank fills.

below 195EF.

13. Time reaches zero.

4. Water level reaches Low Level Cut-Off (LLCO)

probe.

A. Buzzer is energized through N.O. contacts

K1-6/4 and Timer - 1/4.

A. LLCO coil is energized. LLCO LED on

WLC board lights.

1) Buzzer remains energized until timer

knob is turned to OFF, new time is set

or drain handle is pulled out (power

switch off).

B. LLCO N.O. contacts close enabling heating

element circuit.

5. Limiting and regulating contactor coils energize.

Power to heating element. Tank water heats.

14. Drain handle pulled out. Tank drains.

A. Power light (1LT-Amber) turns off.

6. Water level reaches Low level (L) probe.

A. No action as internal latching relay (ILR-1)

contacts are open.

7. Water level reaches high level (H) probe.

F25213 (May 2006)

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MODEL C24EA - ELECTRICAL OPERATION

B. Time delay relay is energized through

E. High limit thermostat closed.

F. Pressure switch is closed.

G. Hold thermostat open.

terminals 2 & 3 for set time (90 seconds).

Output (120VAC) on terminal 1.

C. Time delay relay output energizes K3 coil.

H. Drain closed and steam generator tank

(referred to as tank) is empty.

1) X1 potential to L1 of WLC board

through N.O. contacts K3-5/3

Steamer door open.

2) LLCO relay K2 coil energized through

closed N.O. contacts K3-5/3, WLC

board N.O. contacts LLCO and N.O.

contacts K3-6/4.

J. Timer is off.

K. Water level control (WLC) and tank

properly grounded.

2. Power switch (1S) is turned on.

A. Power light (3LT - Amber) illuminates.

B. X1 potential to L1 of WLC board.

a. Drain Flush Solenoid enabled by

closure of N.O. contacts K2-3/5.

3) Heating element and timer control

circuits are disabled by opening of

N.C. contacts K3-6/2.

1) 120VAC across L1 & L2 of WLC

board.

15. Condensate Thermostat reaches 135E F cut-in

temperature, contacts close. Drain water

temperature is regulated through condensate

thermostat.

2) High level coil (HL) energized on WLC

board. HL LED on WLC board lights.

C. Fast Fill Solenoid (3SOL) energized

through N.C. contacts K3-1/5, N.C.

contacts WLC (LLCO) and N.C. contacts

K2-5/1. Tank begins to fill with water.

A. Cooling Solenoid and Drain Flush Solenoid

energized through cycling of Condensate

Thermostat.

3. Water level reaches Low Level Cut-Off (LLCO)

probe.

16. Tank water level drops below L probe.

A. Internal latching relay (ILR) de-energizes.

A. LLCO coil is energized. LLCO LED on

WLC board lights.

1) High level coil (HL) energized on WLC

board. HL LED on WLC board lights.

B. LLCO N.C. contacts open de-energizing

Fast Fill Solenoid.

17. Tank water level drops below LLCO probe.

A. LLCO relay K2 de-energized through

opening of WLC board LLCO N.O.

contacts.

C. LLCO N.O. contacts close enabling timer

and heating element circuits.

4. Limiting contactor coil energizes.

1) Drain Flush Solenoid energized

through N.C. contacts (K2-6/2).

5. Regulating contactor coil energizes through

N.C. contacts K1-1/5. Power to heating

element. Tank water heats.

2) Flush/Fast Fill Solenoid energized

through N.C. contacts K2-6/2 and K2-

5/1.

6. Tank water reaches 195E F. Hold thermostat

contacts close.

3) Vacuum Relief Solenoid is energized

through closed N.O. contacts K2-2/6.

A. Slow Fill Solenoid is energized through

closure of Cycling Thermostat (3TAS) and

closed WLC (HL) N.O. contacts. Tank

continues to fill.

18. Time Delay Relay time elapses.

A. Power (120VAC) removed from output of

Time Delay Relay terminal 1.

B. Relay K1 energizes. Timer circuit is

enabled through closure of N.O. contacts

K1-6/4 and K1-5/3.

1) All solenoids, coils and WLC board

are de-energized.

1) Ready light (1LT - Green) illuminates.

2) Relay K4 energizes.

Professional Model

1. Conditions

a. Super Heater energizes through

closure of N.O. contacts K4-6/4.

A. Steamer connected to correct voltage.

1) 120VAC potential across X1 & X2 on

secondary side of main transformer.

b. Ready light (1LT - green) lights.

c. Latch circuit is completed by

closure of N.O. contacts K4-5/3.

B. Steamer connected to water supply with

correct water requirements.

C. Temperature in tank is maintained at

195E F by Cycling Thermostat control of

regulating contactor through N.C. contacts

K1-1/5.

C. Power switch is in off position.

1) Time delay relay timed out. Timer has

no output on terminal 1.

D. Condensate thermostat is open.

7. Water level reaches Low level (L) probe.

Page 43 of 52

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MODEL C24EA - ELECTRICAL OPERATION

A. No action as internal latching relay (ILR-1)

C. Time delay relay output energizes K3 coil.

contacts are open.

1) X1 potential to L1 of WLC board

through N.O. contacts K3-3/5.

8. Water level reaches high level(H) probe.

A. Internal latching relay (ILR) coil on WLC

board energizes.

2) Relay K2 coil energized through WLC

N.O. contacts LLCO and N.O.

contacts K3-6/4.

B. High level (HL) coil de-energized by ILR-2

contacts opening.

3) Heating element and timer control

circuits are disabled by opening of

N.C. contacts K3-6/2.

C. Slow Fill Solenoid de-energized by opening

of HL contacts on WLC board.

D. Power (120VAC) across primary of drain

transformer. Motorized drain valve

energized. Drain valve opens and tank

begins to drain.

D. HL LED on WLC board turns off.

9. Timer knob set to CONSTANT for continuous

steam operation or Timer knob is turned to a

timed setting.

1) Drain valve N.O. contacts close.

A. Power (120VAC) present to Door Switch

wire #19.

15. Condensate Thermostat reaches 135EF,

contacts close. Drain water temperature is

regulated through condensate thermostat.

B. If Timer is set to a timed setting, Timer

motor is energized through closure of N.O.

contacts K1-6/4. Count down time begins.

A. Cooling Solenoid (1SOL) energized

through closure of Condensate Thermostat

contacts.

10. Steamer door is closed.

A. Door Switch (2S) contacts close. Cook light

(2LT - Red) illuminates.

B. Flush Solenoid (2SOL) energized through

closure of N.O. contacts K2-3/5 and drain

valve N.O. contacts.

B. Regulating contactor remains energized as

long as door is closed and Timer is set to

CONSTANT or time remains on timed

cycle.

16. Tank water level drops below L probe.

A. Internal latching relay (ILR) de-energizes.

1) High level coil (HL) energized on WLC

board. HL LED on WLC board lights.

11. Temperature of condensate exiting cooking

cavity increases to above 135EF.

17. Tank water level drops below LLCO probe.

A. Condensate thermostat closes energizing

cooling solenoid 1SOL. Condensate is

cooled in drain box before entering facility

drain system.

A. Relay K2 de-energized through opening of

WLC board LLCO N.O. contacts.

B. Vacuum Relief Solenoid energized through

N.C. contacts K2-2/6.

12. Door opened during timed cook cycle.

A. Timer continues count down until time

equals zero even if steamer door is

opened.

C. Fast Fill Solenoid energized through WLC

(LLCO) N.C. contacts and N.C. contacts

K2-5/1.

B. Regulating contactor de-energizes and

cook light turns off.

D. Flush Solenoid (2SOL) remains energized

through WLC (LLCO) N.C. contacts.

13. Time reaches zero.

18. Time Delay Relay time elapses.

A. Buzzer is energized through N.O. contacts

K1-6/4 and Timer - 11/14.

A. Power (120VAC) removed from output of

Time Delay Relay terminal 1.

1) Buzzer remains energized until timer

knob is turned to OFF, new time or

CONSTANT is selected or steamer is

turned off.

1) All Solenoids, coils and WLC board

are de-energized.

2) Motorized drain valve de-energized.

Drain valve closes.

14. Power Switch (1S) pushed to off.

A. Power (3LT), Cook (2LT) and Ready (1LT)

lights turn off.

B. Time delay relay is energized through

terminals 2 & 3. Output (120VAC) on

terminal 1 for 90 seconds.

F25213 (May 2006)

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MODEL C24EA - ELECTRICAL OPERATION

WIRING DIAGRAMS

Heating Element Wiring

Page 45 of 52

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F25213 (May 2006)

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MODEL C24EA - TROUBLESHOOTING

TROUBLESHOOTING

SYMPTOM

POSSIBLE CAUSES

Compartment leaks water around door.

1. Unit not level.

2. Drain line obstructed or not to an open gap drain.

3. Door gasket damaged.

Cold water condenser not operating

properly.

1. Solenoid (2SOL) inoperative or plugged.

2. Lack of water supply.

3. Drain water thermostat stuck open.

4. Drain cold water condensate valve malfunction.

Steam leaks around door.

1. Worn gasket - See DOOR section.

2. Damaged gasket.

3. Drain line obstructed or not to an open drain.

Steam generated inside cooking

compartment when timer is off.

1. Cycling thermostat (2TAS) or related heat control circuitry

malfunction.

2. Relay K1 malfunction.

Steam leaking inside panels.

1. Tank gasket not sealing.

2. Loose steam line.

Heat coming on without water in tank.

1. Dirty low level cut-off probe (shorted to ground).

2. Contactor malfunction.

3. WLC- LLCO contacts stuck closed. Water level controller

(WLC) malfunction.

Machine will not heat.

1. Check incoming voltage.

2. Tank not filled.

3. Power switch malfunction.

4. Water Level Control malfunction.

5. Relay (K1) malfunction.

6. High-limit thermostat open (2TAS).

7. Heating element inoperative.

8. Limiting or regulating contactor malfunction.

9. Control thermostat open (2TAS).

10. Relay (K3) malfunction.

11. Water too pure for probes to properly conduct electricity.

Steamer leaks water.

1. Loose connections in water, steam or drain lines.

Tank water level too high.

1. Slow fill solenoid (4SOL) or fast fill solenoid (3SOL) does not

shut off.

2. High level probe malfunction (open circuit).

3. Water level control board inoperative (WLC).

Tank does not fill.

1. Water supply not on.

2. Slow fill solenoid (4SOL) or fast fill solenoid (3SOL) not being

energized or plugged.

3. Water level control board malfunction (WLC).

4. Water level probes shorted to ground.

Timer motor does not run

1. Relay K1-6/4 contacts not closing.

2. Timer malfunction.

Water running out of drain during fill.

1. Manual drain open (Basic only).

2. Motorized drain valve stuck open (Professional only).

3. Time delay relay malfunction.

4. Condensate thermostat malfunction.

Door not closing properly.

Door won’t open.

1. Door latch assembly.

2. Striker adjustment.

1. Latch won’t release. Refer to DOOR LATCH ADJUSTMENT

as outlined in DOOR.

Buzzer not operating.

1. Timer malfunction.

2. Buzzer malfunction.

F25213 (May 2006)

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MODEL C24EA - TROUBLESHOOTING

- N O T E S -

Page 51 of 52

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MODEL C24EA - CONDENSED SPARE PARTS LIST

CONDENSED SPARE PARTS LIST

C24EA

PART NO.

844069-1

856658-1

294500-33

410472-8

411500-12

416535-6

855661-1

881654

DESCRIPTION

Water Level Control Board (WLC)

Cavity Vacuum Breaker

Transformer

Basic

Professional

Qty.

Terminal Block - Main

Transformer (2T)

Relay

Time Delay Relay

Contactor

FE-024-94

294436-3

856621-1

856773-1

411499-4

856718-1

FP-090-57

857022-1

850736-2

856716-1

856720-2

856720-4

856720-6

856756-1

856710-1

856710-2

856709-1

856711-1

842049-1

855677-1

857021-1

855286-1

855286-2

Fuse, 250V, 4A (slow blow)

Fuse Block

Timer

Timer Knob

Buzzer

Drain Valve Assembly, Motorized

Drain Valve, Manual

Pressure Switch

Water Level Probe Assembly

Temperature Probe Hold Thermostat

Dual Water Valve, Fill (3 & 5 pan)

Dual Water Valve, Condensate (3 pan)

Dual Water Valve, Condensate (5 pan)

High-Limit Thermostat

Heating Element Assy 208/240, 15 kW (5 pan)

Heating Element Assy 208/240, 8.5 kW (3 pan)

Heating Element - Super Heater 208/240V

Generator Tank Gasket

Switch, Door (also power switch for Basic steamer)

Switch, Power (Professional only)

Solenoid, Vacuum Relief

Gasket, Door (3 pan)

Gasket, Door (5 pan)

F25213 (May 2006)

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