Vulcan Hart Electric Steamer ML 136058 User Manual

SERVICE MANUAL

C24EA SERIES

ELECTRIC CONVECTION

STEAMERS

C24EA6

ML-136058

C24EA10 ML-136059

C24EA6 SHOWN

- 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

F35453 (July 2008)

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MODEL C24EA - GENERAL

GENERAL

WATER SUPPLY REQUIREMENTS

INTRODUCTION

Supply pressure should be

20-60 psig

This manual is applicable to the models and ML

numbers listed on the cover page. Procedures apply

to all models unless specified otherwise.

In line strainer for supply line

(Supplied)

Total dissolved solids (TDS)*

Total alkalinity

less than 60 ppm

less than 20 ppm

less than 13 ppm

less than 4.0 ppm

6.5 to 8

Steam Cooking

Silica

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.

Total Chloride

PH factor

Undissolved Solids

*17.1 ppm = 1 grain of hardness

less than 5 microns

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

MODELS COVERED

It is recommended that a local water treatment

specialist be consulted before the installation of any

steam generating equipment.

Model Designations (based on 2.5 inch pan

depth)

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 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.

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

C24EA6

C24EA10

Volts

Phase

Total

Amps

16.9

19.0

16.9

19.0

17.2

25.6

25.2

25.6

This phenomenon causes several problems:

208

240

121

110

1. Reduces the heat transfer efficiency of heating

elements.

2. Causes premature failure of heating elements.

3. Water level probes will give false readings.

208

240

480

4. Temperature sensing bulbs will sense

temperature incorrectly.

1. Voltage values are @ 60HZ.

NOTES:

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.

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.

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MODEL C24EA - GENERAL

Other chemical properties in water supplies can also

TOOLS

affect good steam generation and vary from within

each state and locality.

•

Standard set of hand tools.

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.

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

NOTE: The use of strainers, or filters will not remove

minerals from the water.

•

Torque Wrench - Capable of measuring

70 in-lbs.

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.

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.

REFERENCE MATERIAL

•

Pressure Gauge Assembly

For replacement parts, refer to Catalog of

Replacement Parts F35454.

•

Low Pressure Gauge - 0 to 5 psi.

recommended (Grainger Part No. 2C641).

For operation, cleaning and maintenance

instructions, refer to Installation and Operation

Manual F35430.

Water Hose Coupling - swivel type

(Grainger Part No. 4KG87).

Reducer Bushing (Grainger Part No.

6MN61).

LUBRICATION

Pipe thread sealant (as required).

Component

Lubrication Type

All NPT Fittings Pipe Thread Sealant, Loctite 565

Door Handle

Lubriplate 630AA

Sliding Bracket

F35453 (July 2008)

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MODEL C24EA - COVERS AND PANELS

COVERS AND PANELS

FRONT BASE PANEL

RIGHT AND LEFT SIDE BASE

PANELS

1. Remove screws from the bottom of panel.

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.

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

tabletop cover.

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

tabletop cover.

3. Reverse procedure to install.

4. Reverse procedure to install.

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MODEL C24EA - COVERS AND PANELS

REAR BASE PANEL

COOKING COMPARTMENT

RIGHT AND LEFT SIDE PANELS

1. Remove electrical power connection to

machine.

NOTE: Removal of left side panel is identical to the

procedure for the right side panel.

2. Turn off water supply and disconnect plumbing

to machine.

1. Remove screws from the bottom of panel.

3. Remove screws securing water valves to panel.

4. Remove screws from the bottom of panel.

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

top cover.

3. Reverse procedure to install.

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

tabletop cover.

6. Reverse procedure to install.

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MODEL C24EA - DOOR

DOOR

REMOVAL

GASKET

1. Close door.

1. Open door.

2. Remove COOKING COMPARTMENT LEFT

SIDE PANEL as outlined under 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. Remove gasket from inner door panel.

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

upper hinge away from front 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.

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.

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.

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MODEL C24EA - DOOR

DOOR HANDLE

Removal

1. Open door.

2. Remove screws from top and bottom of door

assembly.

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.

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.

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.

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.

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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.

4. Remove retaining pin from spring pin.

5. Separate sliding bracket from stationary

bracket.

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MODEL C24EA - DOOR

8. Remove outer door housing.

Do not drive bearing into place. The inner

Installation

1. Install latch assembly onto inner door panel with

spring pin toward bottom of door panel.

door panel could be damaged. Press bearing into

position.

A. Apply Loctite 271 to threads of screws

before assembly and secure latch

assembly to inner door panel.

NOTE: When replacing door hinge bearings, replace

both hinge bearings.

9. Position replacement hinge bearing over hinge

opening in door assembly.

2. Install outer door housing assembly as outlined

under DOOR HANDLE.

A. Press hinge bearing fully into door

assembly using a C-clamp or equivalent.

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

1. Close door.

2. Remove COOKING COMPARTMENT LEFT

SIDE PANEL as outlined under COVERS AND

PANELS.

Opening a Jammed Door

Should the steamer door jam and cannot

be opened, do not force or pry the door as damage

will occur.

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 COOKING

COMPARTMENT RIGHT SIDE PANEL as

outlined under COVERS AND PANELS.

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.

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MODEL C24EA - DOOR

B. Locate the striker that catches on door

Adjustment

latch near steam chamber on front panel.

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.

C. Remove the nut from striker and this

should release it from the panel.

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.

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.

Page 11 of 68

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MODEL C24EA - THERMOSTATS AND HIGH LIMITS

THERMOSTAT AND HIGH LIMITS

HEAT EXCHANGER HIGH LIMIT

STEAM GENERATOR HIGH LIMIT

Removal

1. Turn off machine to drain steam generator.

Allow steamer to complete drain cycle.

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.

A. Turn off water supply.

2. Remove FRONT BASE PANEL as outlined

under COVERS AND PANELS.

3. Disconnect electrical lead wires from heat

exchanger high limit.

3. Remove heating element (1HTR) from steam

generator as outlined under HEATING

ELEMENTS AND CONTACTORS.

4. Loosen hose clamps securing heat exchanger

high limit to the heat exchanger surface.

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.

5. Remove heat exchanger high limit.

6. Disconnect electrical wiring to high limit.

7. Remove high limit from the rear of low voltage

control box.

6. Reassemble parts removed in reverse order.

7. Check steamer for proper operation.

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MODEL C24EA - THERMOSTATS AND HIGH LIMITS

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

1. Turn off machine to drain steam generator.

Allow steamer to complete drain cycle.

RIGHT SIDE SHOWN

A. Turn off water supply.

2. Remove RIGHT SIDE BASE PANEL as

outlined under COVERS AND PANELS.

8. Remove capillary tube from heating element.

Installation

3. Disconnect electrical wiring to condensate

thermostat.

1. Route capillary bulb through the opening in

heating element mounting plate. Ensure there

are no sharp bends in capillary tubing while

installing.

4. Remove condensate thermostat from the rear of

drain box.

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.

REAR OF DRAIN BOX SHOWN

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.

3. Install heating element with a new gasket.

Torque mounting nuts to 70 in-lbs and tighten

using an alternating pattern.

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MODEL C24EA - TIMERS

TIMERS

REMOVAL AND REPLACEMENT

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.

4. Reverse procedure to install.

5. Check steamer for proper operation.

UPPER COMPARTMENT 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 ELEMENTS AND CONTACTORS

HEATING ELEMENTS AND CONTACTORS

REMOVAL AND REPLACEMENT

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.

HEATING ELEMENT (1HTR) WITH STEAM

GENERATOR HIGH LIMIT SHOWN

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.

5. Remove mounting nuts and lock washers

securing heating element to steam generator.

7. Check steamer for proper operation and leaks

around heating element.

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MODEL C24EA - HEATING ELEMENTS AND CONTACTORS

Contactors

HEATING ELEMENTS

DIAGNOSTIC CHECK

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.

1. Check voltage across heating element lead

wires at the limiting and regulating contactor

terminals and verify against data plate.

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.

6. Reassemble parts removed in reverse order.

7. Check steamer for proper operation.

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.

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MODEL C24EA - HEATING ELEMENTS AND CONTACTORS

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 PER

CURRENT PER

RESISTANCE PER

ELEMENT (OHMS)

VOLTAGE

ELEMENT

8.0

ELEMENT

12.8

208 ¹

240 ¹

480 ²

208 ¹

240 ¹

480 ²

16.2

28.8

16.2

28.8

10.5

8.0

14.8

9.6

8.0

12.8

10.5

8.0

14.8

9.6

¹Dual voltage elements.

²480V elements are connected in Wye configuration for 277V across each element.

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

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MODEL C24EA - HEAT EXCHANGER ELEMENTS AND RELAYS

HEAT EXCHANGER ELEMENTS AND RELAYS

REMOVAL AND REPLACEMENT

Heat Exchanger 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 and RIGHT

SIDE BASE PANEL as outlined under COVERS

AND PANELS.

3. Note electrical connections for the heat

exchanger element being replaced then

disconnect lead wires from heat exchanger

relay and contactor.

NOTE: When installing, align the flat on delime valve

stem and the locking pins on delime valve to the

motorized control assembly.

NOTE: The two electrical plugs on the motorized

control assembly are identical. Note location of

electrical wiring if disconnecting from motorized

control assembly. If the electrical plugs not

connected correctly, the motorized delime valve will

not function.

5. Remove heat exchanger element from heat

exchanger.

4. Remove motorized control assembly from

delime valve. Rotate the assembly CCW

approximately 1/8 turn to disengage from

delime valve.

NOTE: To access heat exchanger element (1),

remove heat exchanger element (2) and the 3/8"

vent tube on vacuum relief valve (outlet side).

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MODEL C24EA - HEAT EXCHANGER ELEMENTS AND RELAYS

HEAT EXCHANGER ELEMENTS

DIAGNOSTIC CHECK

1. Check voltage across heat exchanger element

lead wires at the limiting and regulating

contactor terminals and verify against data

plate.

A. If voltage is correct, check current draw

(step 2).

6. Reassemble parts removed in reverse order.

Apply pipe thread sealant to threads of heat

exchanger element before assembly.

B. If voltage is not correct, check the

following:

7. Check steamer for proper operation and leaks

around heat exchanger element.

1) Voltage supply to steamer.

2) Fuses or breaker open.

Heat Exchanger Relays (K10, K12)

1. Turn off machine to drain steam generator.

Allow steamer to complete drain cycle.

3) Heat exchanger relay (K10) (heat

exchanger element 1) or heat

exchanger relay (K12) (heat

exchanger element 2).

2. Remove FRONT BASE PANEL as outlined

under COVERS AND PANELS.

4) Power to contactor coils.

3. Remove top screw securing cover to high

voltage control box.

5) Contactors not pulling in (mechanical

problem)

4. Note electrical connections for the heat

exchanger relay being replaced then disconnect

lead wires from relay terminals and coil.

2. Check current draw (amps) through heat

exchanger element lead wires using an amp

clamp meter.

5. Remove screws securing heat exchanger relay

to high voltage control box then remove relay.

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 heat exchanger

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 replacement heat exchanger

element.

6. Reassemble parts removed in reverse order.

7. Check steamer for proper operation.

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MODEL C24EA - HEAT EXCHANGER ELEMENTS AND RELAYS

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 heat exchanger element lead wires and check resistance using a VOM.

C. If resistance is not correct, replace heat exchanger element.

4. Check steamer for proper operation.

WATTS PER

ELEMENT

CURRENT PER

ELEMENT

RESISTANCE PER

ELEMENT (OHMS)

MODEL

VOLTAGE

208 ¹

240 ¹

480 ²

208 ¹

240 ¹

480 ²

450

600

800

2.20

2.50

2.20

2.90

3.30

2.90

96.1

96.0

128.0

72.1

72.0

95.9

C24EA6

C24EA10

Dual voltage elements.

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

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

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

WATER LEVEL CONTROL COMPONENTS

WATER LEVEL CONTROL - LOW LEVEL CUT-OFF AND

DIFFERENTIAL OPERATION

The steamer is equipped with three water level sensing probes

(high, low and low level cut-off) and a water level control. The

water level control 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) has input voltage (120VAC) across terminals 11 and 12 which powers the primary

side of the transformer. On one side of the transformer secondary, power is provided to the control by a series

path through chassis ground (terminal 10). The other side of the transformer secondary (12VAC) is attached to the

probe that directs power to the other side of WLC relay coils (LLCO and HL) and to the inverse latching relay

(ILR) electronic circuit on the WLC. As water enters the steam generator, it becomes part of the WLC circuit. When

the water level in the steam generator reaches a probe, that circuit is completed.

The inverse latching relay of the WLC 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 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 steam 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 steam generator drops below the LLCO probe.

When the water level reaches the low level (LL) probe, power to terminal 2 on the WLC is present but no switching

occurs.

After the water level reaches the high level (HL) probe, the inverse latching relay of the WLC 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 steam generator.

When the water level drops below the low level (LL) probe, power is removed from the inverse latching relay, the

HL relay energizes through ILR-2 and HL contacts change state. The slow fill solenoid is energized through HL-1

to refill the steam generator and the HL LED is lit. The HL relay and LED will toggle on and off during a cooking

cycle as needed.

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

WATER LEVEL CONTROL

WATER LEVEL PROBES

1. Remove RIGHT SIDE BASE PANEL as

outlined under COVERS AND PANELS.

2. Note locations of electrical wiring and

disconnect lead wires to water level probes.

WATER LEVEL PROBE ELECTRICAL

CONNECTIONS

1. Remove FRONT BASE PANEL as outlined

under COVERS AND PANELS.

Water Level

Control

Wiring

Water Level

Probe

2. Squeeze tab on plastic standoffs (5) to release

water level control.

# 5 A - Blue

H - High Level

L - Low Level

# 6 B - Yellow

LLCO - Low Level

Cut-Off

LLCO

# 7 C - Red

3. Remove probes from probe housing.

3. Note electrical connections then disconnect

lead wires from water level control (WLC). Refer

to the machine schematic when installing water

level control.

4. Reassemble parts and lead wires removed in

reverse order.

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 after assembling.

NOTE: Apply pipe thread sealant to threads of probe

before installation.

4. Reverse procedure to install.

NOTE: Perform steam generator DELIMING.

F35453 (July 2008)

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

FILTERED AND NON-FILTERED

DUAL WATER SOLENOID

VALVES

NOTE: The filtered and non-filtered water solenoid valves are constructed as dual water valve assemblies. The

two water valve assemblies used on the steamer have different flow rates and should not be interchanged.

DUAL WATER VALVE FLOW RATES (GPM)

Filtered Water

Fast Fill/Flush Valve

(3SOL)

Slow Fill Valve

(4SOL)

(Steam Generator Fill)

4.8

0.28

Non-Filtered Water

Cavity Condensate Valve

Drain Cooling Valve

(Condensate/Drain Cooling)

(2SOL)

(1SOL)

3.8

1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle.

A. Turn off water supply.

2. Disconnect incoming water to the dual water solenoid valve being replaced (filtered or non-filtered).

3. Remove RIGHT SIDE BASE PANEL as outlined under COVERS AND PANELS.

4. Note electrical connections then disconnect wires from solenoid valve.

5. Note hose connections then disconnect hoses from the outlet of solenoid valve.

NOTE: Use new band clamps when connecting hoses. See TOOLS.

DUAL WATER VALVES SHOWN

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

6. Remove screws (2) securing dual water

solenoid valve to rear panel.

7. Reassemble parts removed in reverse order.

8. Verify water supply is connected to the correct

dual water solenoid valve (filtered or non

filtered).

9. Check steamer for leaks and proper operation.

5. Push in on the manual drain override knob to

disengage the gear set.

MOTORIZED DRAIN VALVE

A. Rotate knob CW to manually open the

drain valve. When the slot in knob is

vertical, the drain valve is open. When the

slot in knob is horizontal, the drain valve is

closed.

1. Turn power switch off.

A. Allow steamer to complete drain cycle.

B. If motorized drain valve has malfunctioned

and the steam generator will not drain

normally, refer to Drain Steam Generator

Manually for draining procedure.

Drain Steam Generator Manually

1. Turn off water supply to steamer.

B. Return manual drain override knob to the

closed position.

2. Disconnect power to steamer allowing time for

water in steam generator to cool to 140EF

before attempting to manually open drain valve.

Removal

3. Remove RIGHT SIDE BASE PANEL as

outlined under COVERS AND PANELS.

1. Turn off water supply to steamer.

2. Remove RIGHT SIDE BASE PANEL as

outlined under COVERS AND PANELS.

4. Locate motorized drain valve found at the front

of steam generator.

3. Remove motorized control assembly from drain

valve. Rotate motorized control assembly CCW

approximately 1/8 turn to disengage assembly

from drain valve.

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MODEL C24EA - WATER LEVEL CONTROL COMPONENTS

8. Reassemble parts removed in reverse order.

Apply pipe thread sealant to pipe threads before

installation.

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 steam generator into the

drain.

9. Verify power 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.

NOTE: When installing, align the flat on delime valve

stem and the locking pins on delime valve to the

motorized control assembly.

NOTE: The two electrical plugs on the motorized

control assembly are identical. If the electrical wiring

is not connected correctly, the motorized drain valve

will not function.

4. Note location of electrical wiring then disconnect

from motorized control assembly.

5. Disconnect drain and drain cooling hoses from

pipe tee located below drain valve.

NOTE: Use new band clamps when connecting

hoses. See TOOLS.

6. Remove drain valve from steam generator.

7. Remove pipe tee and nipple plumbing assembly

from drain valve.

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MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER

SWITCHES, SOLENOIDS, RELAYS AND BUZZER

NOTE: If replacing the switch assembly (gaskets,

power and delime switches), remove the switch

POWER AND DELIME SWITCHES

bezel from the front panel.

5. Reassemble parts removed in reverse order.

6. Check steamer for proper operation.

DOOR SWITCH

1. Remove COOKING COMPARTMENT RIGHT

SIDE PANEL as outlined under COVERS AND

PANELS.

2. Locate switch on front panel.

Removal

1. Remove COOKING COMPARTMENT RIGHT

SIDE PANEL as outlined under COVERS AND

PANELS.

2. Open cooking compartment door.

3. Note electrical connections then disconnect

lead wires from switch.

LOWER COMPARTMENT SHOWN

3. Disconnect electrical plug from the switch being

replaced.

4. Remove switch from bezel on the front panel.

UPPER COMPARTMENT SHOWN

4. Remove switch from the door switch mounting

bracket. Retain hardware.

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MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER

2. Remove FRONT BASE PANEL as outlined

Installation

under COVERS AND PANELS.

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

in groove nearest front panel.

3. Locate pressure switch on the left side of the

switch piping assembly.

2. Loosely install door switch onto door switch

mounting bracket.

A. Close door.

B. Push switch up against switch linkage as

far as possible.

C. Tighten switch mounting hardware.

3. Check door switch operation.

4. Disconnect electrical wiring to pressure switch.

5. Remove pressure switch from piping.

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.

6. Reassemble parts removed in reverse order.

A. Apply pipe thread sealant to threads of

pressure switch before installation.

B. Verify Mylar cover is in position covering

electrical connections.

B. Open door. Meter should indicate an open

circuit as door is opened.

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.

4. Check steamer for proper operation.

PRESSURE SWITCH (1PAS)

C. If pressure switch is being replaced, check

the initial pressure switch setting using the

reference scale on the pressure switch.

The top surface of adjustment wheel

should be aligned slightly below the 5 psi

mark on pressure switch.

Removal

1. Turn off machine to drain steam generator.

Allow steamer to complete drain cycle.

7. Perform pressure switch Check.

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MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER

NOTE: Operating pressures will vary slightly

Check

between machine being serviced and gauge

used.

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 the steam generator

connections or pressure gauge fittings.

7. While observing pressure gauge, listen for

contactor to release indicating that pressure

switch contacts have opened. Correct range for

pressure switch cut-out is between 3.5 to 3.7

psi.

1. Turn off machine to drain steam generator.

Allow steamer to complete drain cycle.

A. Listen for switch contacts to close

(contactor will energize).

2. Remove FRONT BASE PANEL as outlined

under COVERS AND PANELS.

B. Observe pressure gauge for three

complete cycles to find the average cut-out

pressure. Record pressure.

3. Remove cap from delime port and install

pressure gauge.

C. If pressure is outside tolerance (3.5 to 3.7

psi), adjustment is necessary. Refer to

Adjustment.

D. If cut-out pressure is within specifications,

turn power switch off. Allow time for

steamer to drain.

8. Remove test gauge and reinstall delime cap.

Adjustment

1. Allow steam production to stabilize as outlined

under Check.

NOTE: Make small incremental adjustments (1/8

turn of toothed adjustment wheel) when adjusting

cut-out pressure.

2. Referring to cut-out pressure recorded in Check

procedure, turn adjustment wheel to bring cut-

out pressure into tolerance.

4. Close cooking compartment doors.

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.

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.

6. Turn on machine and allow to pressurize (ready

light on).

A. Set one cook timer for approximately 15

minutes.

B. Allow steamer to cycle three times for

steam production to stabilize.

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MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER

B. Check cut-out pressure after making

VACUUM RELIEF SOLENOID

adjustment. Repeat Check and Adjustment

as necessary until cut-out pressure is

within 3.5 to 3.7 psi.

PRESSURE SWITCH (2PAS)

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.

1. Turn off machine to drain steam generator.

Allow steamer to complete drain cycle.

3. Locate vacuum relief solenoid connected to the

water level probe housing and condensate coil.

2. Remove FRONT BASE PANEL as outlined

under COVERS AND PANELS.

3. Locate pressure switch on the right side of the

switch piping assembly.

4. Disconnect electrical wiring to solenoid coil.

5. Disconnect compression fitting from the outlet

side of solenoid valve.

A. Remove solenoid from the pipe nipple and

tee connected to water level probe

housing.

4. Disconnect electrical wiring to pressure switch.

5. Remove pressure switch from piping.

6. Reassemble parts removed in reverse order.

A. When installing solenoid valve, use two

wrenches to avoid bending condensate coil

tubing. Install valve with the outlet side of

valve connected to the vent tubing that

leads to the floor (behind drain box). Apply

pipe thread sealant to pipe threads before

assembly.

A. Apply pipe thread sealant to threads of

pressure switch before installation.

7. Check steamer for proper operation.

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MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER

COMPARTMENT STEAM

TIME DELAY RELAY

SOLENOID

1. Turn off machine to drain steam generator.

Allow steamer to complete drain cycle.

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.

2. Remove RIGHT SIDE BASE PANEL as

outlined under COVERS AND PANELS.

3. Note electrical connections for the time delay

relay then disconnect lead wires from relay.

3. Locate compartment steam solenoid connected

to cooking compartment.

4. Remove screw securing relay to low voltage

control box then remove relay.

LOWER COMPARTMENT SOLENOID SHOWN

5. Reassemble parts removed in reverse order.

6. Check steamer for proper operation.

4. Disconnect electrical wiring to solenoid coil.

NOTE: When installing, ensure time delay knob is

rotated fully CCW to the lowest setting (approx. 2

seconds). Remove jumper wire for proper operation

at steamer control circuit voltage (120VAC).

5. Disconnect steam hose from the outlet side of

solenoid.

NOTE: Use new band clamps when connecting

hoses. See TOOLS.

6. Remove solenoid from steam supply manifold.

A. Remove pipe fittings from solenoid.

7. Reassemble parts removed in reverse order.

Apply pipe thread sealant to pipe threads before

installation.

8. Check steamer for proper operation.

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MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER

5. Remove remaining hardware securing door

BUZZER

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.

7. Reassemble parts removed in reverse order.

Perform DOOR LATCH ADJUSTMENT as

outlined under DOOR.

1. Remove COOKING COMPARTMENT RIGHT

SIDE PANEL as outlined under COVERS AND

PANELS.

2. Locate buzzer on the door switch mounting

bracket.

3. Disconnect electrical wiring from the buzzer and

door switch.

4. Remove door striker.

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MODEL C24EA - CONTROL BOARD

CONTROL BOARD

REMOVAL AND REPLACEMENT

1. Remove FRONT BASE PANEL as outlined under COVERS AND PANELS.

2. Disconnect electrical connectors from control board.

3. Squeeze tab on plastic standoffs (10) to release control board.

4. Reassemble parts removed in reverse order.

5. Check steamer for proper operation.

NOTE: When installing, ensure the board jumpers are set to factory defaults as follows: Delime time delay relay

jumper set to 60 minutes; drain time delay relay jumper set to 3 minutes; and machine type set to floor model.

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MODEL C24EA - CONTROL BOARD

LAYOUT AND LED LEGEND

The control board provides a central location for wire harness connections and power transfer through board

relays (K1-K9, and K11) and time delay relays (delime 1, delime 2 and drain) to the steamer controls. Also,

provides a condition or component troubleshooting indicator by utilizing eighteen LED’S on the board.

LED LEGEND

LED ON = Condition satisfied or component energized. LED OFF = Condition not satisfied or component de-energized.

LED

Component

Board powered (120VAC).

LED

Component

Drain relay (K3).

Drain relay (K5).

Limiting contactor (1CON).

Regulating contactor 1 (2CON). ¹

Regulating contactor 2 (3CON). ²

Relay (K1) energized.

Upper cavity relay (K8). ³

Lower cavity relay (K9). ³

Vacuum relief solenoid (2SOL). ⁴

Delime 1 time delay relay powered.

Delime relay (K4).

Delime relay (K2).

Delime relay (K6).

Heat exchanger relay (K10).

Drain time delay relay (TDR).

Delime relay (K7).

High limit relay (K11).

1. Contactor will cycle heating elements to maintain steam generator pressure when one or both compartments are in use;

or when idling to maintain pressure when compartments are not in use.

2. Contactor will cycle heating elements as necessary to maintain steam generator pressure when both compartments are

in use.

3. K8 and K9 must be energized for heat exchanger relay (K12) to be energized. Heat exchanger element (2) is then

powered.

4. Allows venting of steam generator.

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MODEL C24EA - CONTROL BOARD

STEAM GENERATOR OPERATIONAL STATUS

(LED INDICATORS)

Use the tables below to determine the operational status of a component or condition by utilizing the LED

indicators on the board. The sections are divided according to their operational step.

NOTE: If steamer power switch is off when line voltage applied, the steamer enters a timed drain cycle then shuts

off.

Starting Conditions

•

Power and water supplied to steamer.

Power switch (1S) off.

Delime switch (2S) off (center position).

Steamer previously operated and drain cycle timed out.

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Power to control board (120V)

Power to drain (TDR)

Main transformer (1T) powered.

Relay timed out, no output to drain circuit.

Pressure switch closed (2PAS). Allows

venting of steam generator during fill.

Vacuum relief solenoid (2SOL) energized.

Power to delime 1 (TDR)

Relay timed out, no output to delime circuit.

All other LED's are off.

Power Switch on

•

Power light (3LT) (amber) on.

HL LED is on. Water level control powered.

Water fills steam generator at fast fill rate.

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as starting conditions

Power removed from drain (TDR)

Same as starting conditions

K4 relay energized. K4-6/2 contacts open.

Power removed from delime 1 (TDR)

All other LED's are off.

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MODEL C24EA - CONTROL BOARD

Water Level at LLCO Probe

•

LLCO LED is on (water level control) (LED is on until water drops below LLCO probe).

All contactors energized (steam generator begins heating).

Water fill of the steam generator changes to slow fill rate.

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Limiting contactor (1CON) energized.

Water level is satisfied (LLCO probe).

Limiting contactor (1CON) will remain

energized with the water level satisfied.

Regulating contactor 1 (2CON) energized. Pressure switch (1PAS) closed; Heating

elements powered.

Regulating contactor 2 (3CON) energized. Pressure switch (1PAS) closed; Heating

elements powered.

Same as Starting Conditions

All other LED's are off.

Water Level at Low level (L) Probe

•

Water level control no changes.

Control Board no changes.

Water Level at High Level (H) Probe

•

HL LED off (water level control).

Water fill of steam generator ends (slow fill valve de-energized).

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Same as Water Level at LLCO Probe

Heating elements remain powered.

Vacuum relief solenoid (2SOL) de-

energized.

Pressure switch opens (2PAS). Allows

steam generator to fully pressurize.

All other LED's are off.

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MODEL C24EA - CONTROL BOARD

Steam Generator at Operating Pressure

•

Ready lights (1LT) (green) lit for the upper and lower compartments.

All contactors de-energized (heating stops).

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Same as Water Level at LLCO Probe

Limiting contactor (1CON) remains energized

with the water level satisfied (LLCO probe).

Regulating contactor 1 (2CON) de-

energized.

Power removed from heating elements.

Contactor will cycle on/off as necessary to

maintain pressure in steam generator with

call for heat from pressure switch (1PAS).

Regulating contactor 2 (3CON) de-

energized.

Power removed from heating elements.

Contactor will cycle on/off as necessary to

maintain pressure in steam generator with

call for heat from pressure switch (1PAS).

Pressure switch opens (1PAS). Power to

cooking compartment controls (except during

delime cycle).

Relay (K1) energized.

All other LED's are off.

Timers Set (Upper and lower Compartments)

•

Cook lights (2LT) (red) lit and cooking compartment steam solenoids energize.

Heat exchanger heating elements energize.

LED 3 will cycle on/off with Regulating Contactor 1 (2CON) to maintain steam generator pressure.

LED 4 will cycle on/off with Regulating Contactor 2 (3CON) to maintain steam generator pressure.

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions.

Same as Water Level at LLCO Probe.

Same as Steam generator at Operating

Pressure.

Upper cavity relay (K8) energized. ³

Lower cavity relay (K9) energized. ³

Upper compartment timer set.

Lower compartment timer set.

Cavity drain water is cooled.

Cavity condensate solenoid (2SOL)

energized.

Heat exchanger element (1) powered when

one or both compartment timers are set.

Heat exchanger relay (K10) energized.

All other LED's are off.

NOTE: No LED is associated with heat exchanger relay (K12). Relays K8 and K9 must both be energized for heat

exchanger relay (K12) to be energized. Refer to SCHEMATIC DIAGRAM.

Water Refill

•

HL LED lit (water level control) (cycles with water level control circuit).

Slow fill solenoid begins until water level reaches H (high level ) probe. HL contacts cycle with water level

control circuit as water level raises and lowers between L (low level) and H (high level) probes.

•

Control Board LED's no changes.

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MODEL C24EA - CONTROL BOARD

Timers Reach Zero (Upper and lower Compartments)

•

Buzzer sounds until timer turned to off, constant or additional time is set.

Cook lights (2LT) (red) turn off and cooking compartment steam solenoids de-energize.

Heat exchanger heating elements de-energize.

LED 3 and 4 will cycle as described under Timers Set (Upper and lower Compartments).

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Same as Water Level at LLCO Probe.

Same as Steam generator at Operating

Pressure.

Upper cavity relay (K8) de-energized. ³

Lower cavity relay (K9) energized. ³

Upper compartment timer timed out.

Lower compartment timer timed out.

Cavity drain water cooling stops.

Cavity condensate solenoid (2SOL) de-

energized.

Power removed from heat exchanger

element (1).

Heat exchanger relay (K10) de-energized.

All other LED's are off.

Power Switch (1S) off

•

Power light (3LT) (amber) and ready light (1LT) (green) off.

Drain valve energized (steam generator begins draining).

Condensate thermostat closes (1TAS) and drain cooling solenoid energized (1SOL).

HL LED off until water drops below L (low level) probe then turns on (water level control).

LLCO led lit until water level drops below LLCO probe (water level control). Fast fill/flush solenoid energized.

LED 2 remains lit until water level drops below LLCO probe then turns off. Limiting contactor (1CON) de-

energized.

•

LED 10 remains lit during 3 minute drain cycle then turns off.

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Pressure switch closed (1PAS). Power

removed from cooking compartment

controls.

Relay (K1) de-energized.

Drain time delay relay (TDR) energized.

Steamer turned off and 3 minute drain cycle

started. Drain transformer (2T) powered.

Drain valve energized and opens.

Vacuum relief solenoid (2SOL) energized.

Delime 1 time delay relay powered.

Pressure switch closed (2PAS). Allows

venting of steam generator during draining.

Output from delime 1 (TDR) load terminal is

not active (delime 1 circuit not powered)

until input voltage trigger is received during

the delime cycle.

Drain Cycle Ends

•

LED's 1, 9, 12 and 13 remain lit.

All other LED's are off.

Steamer is off.

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MODEL C24EA - CONTROL BOARD

DELIMING CYCLE STATUS

(LED INDICATORS)

•

Conditions same as listed under STARTING CONDITIONS.

Delime time delay relay 2 (TDR) and drain time delay relay (TDR) jumpers on the control board are set at their

default times as shown on the schematic.

•

Delime valve closed.

Delime solution added to steam generator.

NOTE: Heat exchanger elements are not energized during delime cycle.

Delime Switch On

•

Delime switch pressed to DELIME position (momentary on - hold 2 sec).

Power light (3LT) (amber) on.

Delime light (4LT) (red) on.

HL Led is on. Water level control powered.

Water fills steam generator at fast fill rate.

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as starting conditions

Relay timed out, no output to delime circuit. LED

remains lit as in Turning Steamer Off.

Power to delime 1 (TDR)

Delime Relay (K4) energized.

Delime 2 (TDR) powered thru K4-6/4 closed contacts

(N.O.). 120VAC output from delime 2 (TDR) load

terminal for 60 minutes.

Power to heating circuit, power light (3LT) and WLC

thru K4-5/3 closed contacts (N.O.).

Delime Relay (K2) energized.

K2-6/4 contacts close (powers delime light)

K2-5/1 contacts open. Power to cooking

compartment controls is locked out (no power to

timers or lights).

Power to delime 1 (TDR) input trigger and delime 1

(TDR) is energized. 120VAC output from load

terminal remains on for 3 additional minutes after

power is removed from input trigger to allow heat

exchanger to drain (delime valve energized). Total

time 63 minutes unless canceled (delime 2 TDR

default time of 60 minutes plus delime 1 TDR of 3

minutes).

Delime transformer (3T) powered. Delime valve

energized and opens.

Delime valve end switch contacts close.

Delime Relay (K7) energized.

K7 powered from delime 1 (TDR) output from load

terminal.

K7-5/1 N.C contacts open. X1 potential removed

from power switch (1S).

K7-5/3 N.O. contacts close. Allows delime 1 (TDR) to

remain powered to hold K7 energized for a delay on

drop out (120VAC output from load terminal remains

on) after K4-6/2 N.C. contacts open.

All other LED's are off.

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MODEL C24EA - CONTROL BOARD

Water Level at LLCO Probe

•

LLCO LED is on (water level control) (LED is on until water drops below LLCO probe).

All contactors energized (steam generator begins heating).

Water fill of the steam generator changes to slow fill rate.

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Limiting contactor (1CON) energized.

Water level is satisfied (LLCO probe).

Limiting contactor (1CON) will remain

energized with the water level satisfied.

Regulating contactor 1 (2CON) energized. Pressure switch (1PAS) closed; Heating

elements powered.

Regulating contactor 2 (3CON) energized. Pressure switch (1PAS) closed; Heating

elements powered.

Same as Starting Conditions

Same as Delime Switch On

All other LED's are off.

Water Level at Low level (L) Probe

•

Water level control no changes.

Control Board no changes.

Water Level at High Level (H) Probe

•

HL LED off (water level control).

Water fill of steam generator ends (slow fill valve de-energized).

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Same as Water Level at LLCO Probe

Heating elements remain powered.

Vacuum relief solenoid (2SOL) de-

energized.

Pressure switch opens (2PAS). Allows

steam generator to fully pressurize.

Same as Delime Switch On

All other LED's are off.

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MODEL C24EA - CONTROL BOARD

Steam Generator at Operating Pressure

All contactors de-energized (heating stops).

•

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Same as Water Level at LLCO Probe

Limiting contactor (1CON) remains energized

with the water level satisfied (LLCO probe).

Regulating contactor 1 (2CON) de-

energized.

Power removed from heating elements.

Contactor will cycle on/off as necessary to

maintain pressure in steam generator with

call for heat from pressure switch (1PAS).

Regulating contactor 2 (3CON) de-

energized.

Power removed from heating elements.

Contactor will remain off for the rest of

delime cycle.

Relay (K1) energized.

Pressure switch opens (1PAS). With Delime

Relay (K2) energized (LED 15 on), K2-5/1

contacts are open to lock out power to the

cooking compartment controls.

Same as Delime Switch On

All other LED's are off.

Steam Generator Maintains Operating Pressure

•

Heat cycles as necessary to maintain steam generator pressure during the delime cycle.

LED 3 will cycle on/off with Regulating Contactor 1 (2CON).

LED's 1, 2, 5, 13, 14, 15 & 17 remain on.

Water level maintained by water level control circuit. HL LED (water level control) will cycle on/off.

Delime Time Reaches Zero

•

Delime light (4LT) (red) on until time expires on Delime 2 (TDR).

Delime cycle heating ends. Limiting contactor (1CON) and regulating contactor 1 (2CON) de-energized.

Drain cycle starts (drain TDR energized). Drain valve energized to allow steam generator to drain. Delime valve

energized to allow heat exchanger to drain.

•

Condensate thermostat closes (1TAS) and drain cooling solenoid energized (1SOL).

HL LED off until water drops below L (low level) probe then turns on (water level control).

LLCO led on until water level drops below LLCO probe (water level control). Fast fill/flush solenoid energized.

LED 2 remains lit until water level drops below LLCO probe then turns off. Limiting contactor (1CON) de-

energized.

•

LED 10 remains lit during 3 minute drain cycle then turns off.

F35453 (July 2008)

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MODEL C24EA - CONTROL BOARD

STATUS

LED

COMPONENT

DESCRIPTION

OFF

Same as Starting Conditions

Regulating contactor 1 (2CON) de-

energized.

Power removed from heating elements.

Pressure switch (1PAS) contacts close.

Relay (K1) de-energized.

Drain (TDR) energized thru K4-6/2

contacts.

120VAC output from drain (TDR) load

terminal. Drain circuit energized.

Drain relay (K5) is energized thru delime

valve end switch closed contacts (N.O.).

K5-6/4 contacts close and delime light (4LT)

is lit.

K5-5/3 latching circuit close contacts allow

LED 11 to light.

Vacuum relief solenoid (5SOL)

energized.

Pressure switch (2PAS) contacts close.

Solenoid valve opens to provide air vent and

allow steam generator to drain.

Same as Delime Switch On

Delime Relay (K4) de-energized.

K4-5/3 contacts open. Power light off.

K4-6/4 contacts open. Power removed from

delime 2 (TDR).

Delime Relay (K2) de-energized.

K2-6/4 contacts open. Delime light off.

Power removed from delime 1 (TDR) input

trigger, delime 1 (TDR) remains powered

thru K7-5/3 N.O. contacts to hold delime

relay (K7) energized for a delay on dropout

(120VAC output from load terminal remains

on). Allows heat exchanger to drain (along

with steam generator during the 3 minute

drain cycle time.

K2-5/1 contacts open. Power to cooking

compartment controls no longer locked out.

Same as Delime Switch On

All other LED's are off.

Delime Cycle Ends

•

LED's 1, 9, 12 and 13 remain lit.

All other LED's are off.

Steamer is off.

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MODEL C24EA - HEAT EXCHANGER

HEAT EXCHANGER

REMOVAL AND REPLACEMENT

1. Turn off machine to drain steam generator. Allow

steamer to complete drain cycle.

Turn off water supply.

2. Remove FRONT and RIGHT SIDE BASE

PANELS as outlined under COVERS AND

PANELS.

3. Disconnect heat exchanger element wiring as

outlined under HEAT EXCHANGER ELEMENTS

AND RELAYS.

4. Remove control assembly from MOTORIZED

DELIME VALVE.

5. Disconnect lead wires from HEAT EXCHANGER

HIGH LIMIT.

6. Disconnect steam hoses from heat exchanger

and separate union.

8. Remove the following parts from heat exchanger

for reuse:

NOTE: Use new band clamps when connecting

hoses. See TOOLS.

Heat exchanger elements.

Heat exchanger high limit.

Delime valve, pipe nipple and union.

Hose barb fittings.

9. If removed or replacing the heat exchanger,

install insulation around the heat exchanger.

Secure into position using high temperature

aluminum foil tape.

10.

Reinstall parts removed in reverse order.

Apply pipe thread sealant to all pipe

threads connected to the heat exchanger.

Do not apply thread sealant to fill union

fitting.

11.

Check steamer for proper operation.

Inspect all connections to the heat

exchanger for leaks.

7. Remove heat exchanger.

Lift heat exchanger off rear support bracket

and move it away from union. Tilt front of

heat exchanger down and lower it onto the

bottom frame cover.

Rotate heat exchanger and remove it from

steamer.

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MODEL C24EA - HEAT EXCHANGER

MOTORIZED DELIME VALVE

NOTE: The motorized delime valve (normally closed)

can be opened or closed manually by pushing in on

the manual override knob on top of the valve to

disengage the gear set. Rotate knob CW to open the

valve (slot in knob vertical); or CCW to close the

valve (slot in knob is horizontal).

Removal

1. Turn off power to machine. Allow steamer to

complete drain cycle.

Turn off water supply to steamer.

7. Remove pipe nipple and union from delime valve.

2. Remove RIGHT SIDE BASE PANEL as outlined

under COVERS AND PANELS.

8. Reassemble parts removed in reverse order.

Apply pipe thread sealant to pipe threads before

installation.

3. Locate motorized delime valve connected to heat

exchanger.

9. Verify motorized delime valve is closed before

applying power to steamer.

4. Remove motorized control assembly from delime

valve. Rotate motorized control assembly CCW

approximately 1/8 turn to disengage assembly

from valve.

NOTE: When power is applied and power switch is

off steamer will enter a delime cycle.

10.

Check steamer for proper operation and

leaks around delime valve.

5. Note location of electrical wiring then disconnect

from motorized control assembly.

NOTE: The two electrical plugs on the motorized

control assembly are identical. If the electrical wiring

is not connected correctly, the motorized delime

valve will not function.

NOTE: When installing, align the flat on delime valve

stem and the locking pins on delime valve to the

motorized control assembly.

6. Separate union then remove delime valve from

heat exchanger.

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MODEL C24EA - STEAM GENERATOR

STEAM GENERATOR

REMOVAL AND REPLACEMENT

1. Turn off machine to drain steam generator. Allow

steamer to complete drain cycle.

Turn off water supply.

2. Remove FRONT, LEFT and RIGHT SIDE BASE

PANELS from generator base and COOKING

COMPARTMENT RIGHT SIDE PANEL as

outlined under COVERS AND PANELS.

3. Remove HEAT EXCHANGER.

4. Remove VACUUM RELIEF SOLENOID.

5. Disconnect compressions fittings then remove

condensate coil tubing.

6. Remove delime hose from water level probe

housing.

8. Disconnect compression fitting then remove the

fill piping assembly from steam generator fill tube.

NOTE: Use new band clamps when connecting

hoses. See TOOLS.

9. Remove MOTORIZED DRAIN VALVE.

10.

Remove HEATING ELEMENTS from

steam generator.

7. Disconnect pop-off tubing then remove relief

valve from steam generator.

11.

Remove high voltage control box from

steamer.

Disconnect electrical supply connections

from terminal block and ground.

Disconnect two wiring harness connectors.

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MODEL C24EA - STEAM GENERATOR

Remove four bolts securing high voltage

control box to frame.

16.

Remove the following parts from steam

generator for reuse:

Drip shield (above elements).

Remaining pipe nipples, tees and elbows.

17.

If removed or replacing steam generator,

install insulation around the generator.

Secure into position using high

temperature aluminum foil tape.

18.

19.

Reinstall parts removed in reverse order.

Apply pipe thread sealant to all pipe

threads connected to the steam generator.

12.

Remove low voltage control box from

steamer.

Check steamer for proper operation.

Inspect all connections for leaks.

Disconnect wiring harness connector

leading to cooking compartment controls.

DELIMING

Refer to the Installation & Operation manual under

the MAINTENANCE section for specific instructions.

RIGHT SIDE SHOWN

Disconnect delime valve and drain valve

harness connectors from control board.

Remove four bolts securing low voltage

control box to frame.

13.

14.

Remove WATER LEVEL PROBES.

Remove ground wire from water level

probe housing.

15.

Remove hardware securing steam

generator to frame (four places) then

remove generator.

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MODEL C24EA - ELECTRICAL OPERATION

ELECTRICAL OPERATION

COMPONENT FUNCTION

STEAM GENERATOR CONTROLS

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

level probes H, L and LLCO.

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

on WLC. Water must reach this level before internal latch relay

is energized.

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

WLC.

Probe (LLCO) . . . . . . . . . . . . . . . . . . . . . . . . . . Low Level Cut-Off (LLCO) probe connected to WLC. Controls

power to heating and fast fill/flush solenoid.

Contactor, (1CON) Limiting . . . . . . . . . . . . . . Connects one side of heating elements to power. Energized

whenever WLC (LLCO) coil is energized.

Contactor 1, (2CON) Regulating . . . . . . . . . . . Connects heating elements to power. On constantly when one

or both cooking compartment timers are set.

Contactor 2, (3CON) Regulating . . . . . . . . . . . Connects heating elements to power. On constantly when both

cooking compartment timers are set.

Elements, Heating . . . . . . . . . . . . . . . . . . . . . . Located in steam generator. Heats water to produce steam.

Elements, Heat Exchanger . . . . . . . . . . . . . . . Two cartridge type heating elements located in the heat

exchanger. Provides additional energy to raise the steam

temperature delivered to the cooking compartments.

Fuse, (1FU & 2FU) . . . . . . . . . . . . . . . . . . . . . . . Slow blow 3A fuse. Located on primary side of main transformer

(1T). Protects control circuitry from over-currents.

Relay, Time Delay . . . . . . . . . . . . . . . . . . . . . . Controlled by delime switch for delime cycle only. Power switch

must be off and delime switch pressed and held for more than 2

seconds to activate time delay relay output and start delime

cycle. Time delay prevents the delime cycle from immediately

starting, if the delime switch is accidentally pressed.

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

hot drain water from steam generator to reduce water

temperature at the drain.

Solenoid, (2SOL) Cavity Condensate . . . . . . Controlled by cavity relay K8 on control board. Solenoid is

energized when timer is on. Mixes cold water with hot

condensate water from cooking compartment to reduce water

temperature at drain.

Solenoid (3SOL), Fast Fill/Flush . . . . . . . . . . Initial steam generator fill. Used during last stage of drain cycle

to flush drain opening free of debris.

Solenoid (4SOL), Slow Fill . . . . . . . . . . . . . . . Secondary steam generator fill. Energized as necessary to

replenish water in steam generator.

Solenoid (5SOL), Vacuum Relief . . . . . . . . . . . Provides open air line to steam generator during filling and

draining. When generator is draining, keeps a vacuum from

developing to prevent cooking compartment flex; and allows

faster draining. When generator is filling, keeps pressure from

building up to allow the generator to completely fill.

Solenoid, Drain Valve (N.C.) . . . . . . . . . . . . . . Controlled by delime relay K7 and delime circuit operation.

When energized by 24VAC, valve opens to drain the steam

generator.

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MODEL C24EA - ELECTRICAL OPERATION

Solenoid, Delime Valve . . . . . . . . . . . . . . . . . . Controlled by delime relay K7 and drain circuit operation. When

energized by 24VAC, valve opens to allow deliming of the heat

exchanger and elements during a delime cycle.

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

Removes power from heating circuit if steam generator pressure

rises above the pressure switch setting.

Switch (2PAS), Pressure . . . . . . . . . . . . . . . . . Vacuum and fill pressure sensing for the steam generator.

When generator is draining, provides power to vacuum relief

solenoid to prevent a vacuum from developing in the steamer.

When generator is initially heating and pressurizes above 4"

W.C. the pressure switch opens to remove power from vacuum

relief solenoid to allow generator to reach operating pressure.

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

Controls the drain cooling solenoid during cooking operation and

drain cycle (130EF close).

High-Limit (2TAS), Steam Generator . . . . . . . Protects steam generator heating elements from over-

temperatures. Capillary tube device (257EF cut-out; 246°F auto

reset).

High-Limit (3TAS), Heat Exchanger . . . . . . . . Protects heat exchanger elements from over-temperatures.

Surface mount device (500EF cut-out; auto reset 450°F).

Transformer (1T), Main . . . . . . . . . . . . . . . . . . Step down transformer from line voltage to 120VAC control

circuit voltage.

Relay, Heat Exchanger (K10) . . . . . . . . . . . . . Connects heat exchanger element (1) to power. On constantly

whenever one or both cooking compartment timers are set.

Relay, Heat Exchanger (K12) . . . . . . . . . . . . . Connects heat exchanger element (2) to power. On constantly

whenever both cooking compartment timers are set.

Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . Controls steam generator operation, draining and deliming

functions. Provides a central location for wire harness

connections and power transfer thru board relays K1 thru K9

and K11 to the steamer controls. Houses 18 LED's for visual

operation status and troubleshooting.

NOTE: The relay’s below are mounted on the control board and are individually replaceable.

Relay (K1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlled by pressure switch (1PAS). K1 relay is energized

when the pressure switch N.O. contacts close.

Relay (K2), Delime . . . . . . . . . . . . . . . . . . . . . . Controlled by delime circuit. K2 relay is energized when delime

switch is turned on (momentary).

Relay (K3), Drain Relay . . . . . . . . . . . . . . . . . . Controlled by drain time delay relay. K3 relay is powered when

power switch is turned off and drain time delay is energized for

the drain cycle.

Relay (K4), Delime . . . . . . . . . . . . . . . . . . . . . . Controlled by delime circuit. K4 relay is energized when delime

switch is turned on (momentary).

Relay (K5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlled by delime circuit. When delime valve is energized,

the delime valve end switch contacts close and K5 relay is

energized.

Relay (K6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlled by delime switch. K6 relay is energized when delime

switch is turned to CANCEL to stop a delime cycle.

Relay (K7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlled by delime circuit. K7 relay is energized when delime

time delay relay 1 is energized during delime cycle.

Relay (K8), Cavity . . . . . . . . . . . . . . . . . . . . . . Controlled by upper cooking compartment timer. When timer is

set, K8 relay is energized and K8- 5/3 contacts close to provide

power to cavity condensate solenoid and heat exchanger relay

(K10). Heat exchanger element (1) energized.

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MODEL C24EA - ELECTRICAL OPERATION

Relay (K9), Cavity . . . . . . . . . . . . . . . . . . . . . . Controlled by lower cooking compartment timer. When timer is

set, relay is energized and power is provided thru K8-1/5 N.C.

contacts to cavity condensate solenoid and heat exchanger

relay (K11). Heat exchanger element (2) energized.

Relay (K11), High Limit . . . . . . . . . . . . . . . . . . Controlled by high limit thermostat (2TAS). Relay is energized if

high limit thermostat opens. When high limit closes, relay

remains energized thru K11-5/3 contacts until power is removed

from steamer.

COOKING COMPARTMENT CONTROLS

The upper section of the steamer consists of two separate cooking compartments. Each compartment functions

independently with its own set of controls. Power is supplied to the compartment controls after steam generator

reaches operating pressure.

Switch (1S), Power . . . . . . . . . . . . . . . . . . . . . Controls 120VAC to steam generator control circuit in the on

position. The switch must be in the off position to provide

120VAC to power delime control circuit.

Switch (2S), Delime . . . . . . . . . . . . . . . . . . . . . Controls 120VAC to initially energize delime control circuit

(momentary on). Press and hold switch for approximately 2

seconds to energize external time delay relay and start delime

cycle.

Switch, Door . . . . . . . . . . . . . . . . . . . . . . . . . . Plunger activated switch wired in series with timer. When switch

is closed and timer is set, regulating contactor(s) are energized

after ready light is on (pressure switch 1PAS satisfied).

Timer, Cooking . . . . . . . . . . . . . . . . . . . . . . . . . Used to set cooking time between 0-60 minutes or select

constant steam. When timer is set, energizes the steam

solenoid valve to allow steam into the cooking compartment.

When time expires, energizes buzzer until timer is turned off.

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

Lamp (1LT), Ready . . . . . . . . . . . . . . . . . . . . . Green (GN) colored lamp. On when door is closed and steam

generator is pressurized (pressure switch 1PAS operated).

Lamp (2LT), Cook . . . . . . . . . . . . . . . . . . . . . . Red (RD) colored lamp. On when door is closed and timer is

set.

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

steam generator high limits are closed.

Lamp (4LT), Delime . . . . . . . . . . . . . . . . . . . . . Red (RD) colored lamp. On when power switch is off and delime

switch is operated.

Solenoid, Compartment Steam . . . . . . . . . . . . When energized by timer, steam solenoid opens to allow steam

into cooking compartment (normally closed valve).

F35453 (July 2008)

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MODEL C24EA - ELECTRICAL OPERATION

COMPONENT LOCATION

Steam Generator Base

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MODEL C24EA - ELECTRICAL OPERATION

F35453 (July 2008)

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MODEL C24EA - ELECTRICAL OPERATION

Water Level Control

Cooking Compartment Controls

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MODEL C24EA - ELECTRICAL OPERATION

SMART CYCLE POWER

MANAGEMENT

Reduces energy use by not powering all the heating elements in steam generator and heat exchanger when the

steamer is at operating pressure and one cooking compartment in use. When both cooking compartments are in

use, all of the heating elements in the steam generator and heat exchanger are powered.

Heating Elements

Steam

Generator Exchanger

Heat

Steamer

Description

6 pan

One cooking compartment in use, only one steam generator heating

element and one heat exchanger element are powered thru limiting

contactor (1CON) and regulating contactor 1 (2CON).

10 pan

One cooking compartment in use, two steam generator heating elements

and one heat exchanger element are powered thru limiting contactor

(1CON) and regulating contactor 1 (2CON).

6 or

10 pan

As listed

above

As listed

above

Two cooking compartments in use, all steam generator heating elements

and both heat exchanger elements are powered thru limiting contactor

(1CON), regulating contactor 1 (2CON) and regulating contactor 2

(3CON).

SEQUENCE OF OPERATION

Refer to the following diagrams when reviewing sequence of operation: Steam generator schematic, cooking

compartment schematic and heating element wiring diagrams (for heat exchanger relay contacts K10 and K12).

The control board delime time delay relay 2 (TDR) and drain time delay relay (TDR) jumpers are set at their default

times as shown on the schematic.

NOTE: If power switch is off when service voltage is applied, steamer will enter timed drain cycle.

Initial Fill and Pre-Heat

1. Conditions (steamer previously operated and drain cycle timed out).

A. Steamer connected to correct voltage.

1) 120VAC potential across X1 and X2 on secondary side of main transformer.

B. Steamer connected to cold water supply with correct water requirements.

C. LED 1 lit (power to control board).

D. Power switch is off (1S).

1) LED 13 lit. Delime 1 (TDR) on control board timed out. Time delay has no output from load

terminal.

2) Delime 2 (TDR) on control board timed out. Time delay has no output from load terminal.

3) LED 9 lit. Drain (TDR) on control board timed out. Time delay has no output from load terminal.

E. Delime switch (2S) is off (center position).

F. Compartment timers off and doors open.

G. Condensate thermostat thermostat (1TAS) open.

H. Pressure switch (2PAS) closed.

1) LED 12 lit. Vacuum relief solenoid (5SOL) energized. Solenoid valve must be open to provide air

vent to allow steam generator to fill.

Steam generator high limit (2TAS) closed.

J. Heat exchanger high limit (3TAS) closed.

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MODEL C24EA - ELECTRICAL OPERATION

K. Pressure switch (1PAS) closed.

L. Drain valve closed and steam generator is empty.

M. Delime valve closed and heat exchanger empty.

1) Delime valve end switch N.O. contacts are open.

N. Water level control (WLC) and steam generator properly grounded.

2. Power switch turned on (1S).

A. LED 13 off. Power removed from delime 1 (TDR) on control board.

B. LED 9 off. Power removed from drain (TDR) on control board.

C. X1 potential thru steam generator high limit (2TAS) and heat exchanger high limit (3TAS).

1) Power light (3LT) (amber) on control panel lit.

2) X1 potential to L1 of water level control (WLC) thru K3-1/5 drain relay N.C. contacts.

a. 120VAC across L1 and L2 of WLC.

b. HL LED lit. High level relay coil (HL) on WLC energized.

3) Fast fill/flush solenoid (3SOL) energized thru WLC (LLCO) N.C. contacts. Steam generator begins

fast fill.

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

A. LLCO LED lit. Low level coil relay (LLCO) on WLC energized.

B. LLCO N.C. contacts open. Fast fill/flush solenoid (3SOL) de-energized.

C. WLC (LLCO) N.O. contacts close. X1 potential thru WLC (LLCO) closed contacts and K3-6/2 N.C. drain

relay contacts.

1) Slow fill solenoid (4SOL) energized thru pressure switch (1PAS) N.C contacts and WLC (HL) closed

contacts. Steam generator changes to slow fill.

2) LED 2 lit. Limiting contactor (1CON) energized.

3) LED 4 lit. Regulating contactor 2 (3CON) energized thru K1-5/1 N.C. contacts.

4) Heat exchanger relay (K12) energized.

a. K12-5/3 N.O. contacts close.

5) LED 3 lit. Regulating contactor 1 (2CON) energized.

D. Power to heating elements. Steam generator heating begins.

4. Water level reaches low level (L) probe.

A. No action as internal latching relay ILR-1 contacts on WLC are open.

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

A. Internal latching relay coil (ILR) on WLC energized and locked thru the low level probe (L) and ILR-1

closed contacts.

B. HL LED off. High level (HL) coil de-energized by ILR-2 contacts opening on WLC.

1) WLC (HL) contacts open. Slow fill solenoid (4SOL) de-energized.

6. Pressure switch (2PAS) operates (approx. 4" W.C.) and N.C. contacts open.

A. LED 12 off. Vacuum relief solenoid (5SOL) de-energized. Solenoid valve must close to allow steam

generator to fully pressurize.

7. Steam generator up to pressure (approx. 4 psi).

A. Pressure switch (1PAS) operates and N.C. contacts open.

1) LED 5 lit. Relay (K1) energized.

a. K1-5/3 N.O. contacts close. X1 potential thru K1-5/3 contacts and K2-5/1 N.C. contacts to

cooking compartment controls.

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a) Ready lights (1LT) (green) are lit for the upper and lower compartments.

b. K1-5/1 N.C. contacts open.

a) LED 4 off. Regulating contactor 2 (3CON) de-energized.

2) LED 3 off. Regulating contactor 1 (2CON) de-energized.

B. Power removed from heating elements. Steam generator heating stops.

Timers Set (Upper & Lower Compartments)

1. Timers set for timed cooking and doors closed.

A. Upper compartment - Timer contacts 11/13 and 21/23 close.

1) LED 6 lit. Upper cavity relay (K8) energized. K8-3/5 N.O. contacts close.

a. LED 8 lit. Cavity condensate solenoid (2SOL) energized. Compartment drain line condensate

cooled.

b. Heat exchanger relay (K10) energized. K10-3/5 N.O. contacts close and heat exchanger

element (1) begins heating.

c. K8-6/4 N.O. contacts close.

2) Cook light (2LT) (red) lit. Steam solenoid energized (steam enters cooking compartment).

3) Timer motor energized.

B. Lower compartment - Timer contacts 11/13 and 21/23 close.

1) LED 7 lit. Lower cavity relay (K9) energized. K9-3/5 N.O. contacts close.

a. LED 8 lit. With upper compartment timer already set, cavity condensate solenoid (2SOL) and

heat exchanger relay (K10) are energized thru K8-3/5 closed contacts.

a) K10-3/5 contacts close and heat exchanger element (1) begins heating.

b. Heat exchanger relay (K12) energized thru K8-6/4 and K9-3/5 N.O. contacts. Heat exchanger

element (2) begins heating.

c. If lower compartment timer is the only timer set, cavity condensate solenoid (2SOL) and heat

exchanger relay (K10) are energized thru K8-1/5 N.C. contacts. Compartment drain line

condensate is cooled. K10-3/5 contacts close and heat exchanger element (1) is energized.

2) Cook light (2LT) (red) lit. Steam solenoid energized (steam enters cooking compartment).

3) Timer motor energized.

2. Steam generator pressure drops below pressure switch (1PAS) set point.

A. Regulating contactor 1 (2CON) and regulating contactor 2 (3CON) are energized and power the heating

elements until pressure switch is satisfied. The pressure switch will cycle the heating circuit as necessary

to maintain steam generator pressure.

1) LED 3 will cycle on/off with regulating contactor 1 (2CON). LED 4 will cycle on/off with regulating

contactor 2 (3CON).

Water Refill (After Initial Fill)

1. The water refill cycle will occur whenever the water level is below the low level probe and will not affect the

operation of either the preheat or cook cycle.

A. Water level drops below low level (L) probe.

1) Internal latching relay coil (ILR) on WLC de-energized. ILR-1 contacts return to N.O. condition.

2) HL LED lit. High level coil (HL) energized by ILR-2 contacts returning to N.C. condition.

a. WLC (HL) contacts close. Slow fill solenoid (4SOL) energized.

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

1) Internal latching relay coil (ILR) on WLC energized and locked thru the low level probe (L) and ILR-

1 closed contacts.

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2) HL LED off. High level (HL) coil de-energized by ILR-2 contacts opening.

a. WLC (HL) contacts open. Slow fill solenoid (4SOL) de-energized.

2. Timers reach zero (Upper & Lower Compartments).

A. Upper compartment - Timer contacts 11/13 and 21/23 open.

1) LED 6 off. Upper cavity relay (K8) de-energized. K8-3/5 contacts return to N.O. condition.

a. LED 8 off. Cavity condensate solenoid (2SOL) de-energized.

b. Heat exchanger relay (K10) de-energized. K10- 3/5 contacts return to N.O. condition and heat

exchanger element (1) de-energized.

c. K8-6/4 contacts return to N.O. condition.

2) Cook light (2LT) (red) off. Steam solenoid de-energized.

3) Timer motor de-energized.

B. Lower compartment - Timer contacts 11/13 and 21/23 open.

1) LED 7 off. Lower cavity relay (K9) de-energized. K9-3/5 contacts return to N.O. condition.

a. LED 8 off. With upper compartment timer expired, cavity condensate solenoid (2SOL) and

heat exchanger relay (K10) are de-energized. K8-3/5 contacts are open.

K10-3/5 contacts open and heat exchanger element (1) de-energized.

b. Heat exchanger relay (K12) de-energized. K8-6/4 and K9-3/5 contacts return to N.O. condition.

Heat exchanger element (2) de-energized.

2) Cook light (2LT) (red) off. Steam solenoid de-energized.

3) Timer motor de-energized.

C. Buzzer energized through timer N.O. contacts 11/14 (upper or lower cooking compartment timer).

1) Buzzer remains energized until: Timer turned to OFF; New time or CONSTANT steam selected; Or

power switch turned off.

Turning Steamer Off

1. Timers off (upper and lower cooking compartments).

2. Power switch (1S) turned off.

A. Power light (3LT) (amber) on control panel off.

3. LED 9 Lit. Drain (TDR) energized thru K4-6/2 N.C. contacts. 120VAC output from load terminal on drain

(TDR) for 3 minute (default) drain cycle time.

A. LED 10 Lit. Drain relay (K3) energized.

1) K3-3/5 N.O. contacts close. HL LED off; LLCO LED lit. WLC remains powered.

2) K3-1/5 N.C. contacts open. Prevents possible short circuit in the event power switch is turned on.

3) K3-6/2 N.C. contacts open. Removes power from heating circuit and compartment controls. Ready

lights (1LT) (green) are off for the upper and lower compartments.

B. Drain transformer (2T) powered (120/24VAC).

1) 24VAC drain valve energized. Valve opens and steam generator begins draining.

4. Drain water temperature above 130°F. Condensate thermostat (1TAS) contacts close (N.O. contacts - close

on temperature rise).

A. Drain cooling valve (1SOL) energized until drain water temperature is below 120°F.

5. Pressure switch (2PAS) N.C. contacts return to closed condition when steam generator pressure drops below

4" W.C.

A. LED 12 lit. Vacuum relief solenoid (5SOL) energized. Solenoid valve must be open to provide air vent

and allow steam generator to drain.

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MODEL C24EA - ELECTRICAL OPERATION

6. LED 13 Lit. Power to delime 1 (TDR). Time delay relay has no output from load terminal until input trigger

voltage is received by delime switch (2S) at the start of a delime cycle.

7. Water level drops below low level (L) probe.

A. Internal latching relay coil (ILR) on WLC de-energized. ILR-1 contacts return to N.O. condition.

B. HL LED lit. High level coil (HL) energized by ILR-2 contacts returning to N.C. condition. WLC (HL)

contacts close.

8. Water drops below LLCO probe.

A. LLCO LED off. Low level relay coil (LLCO) on WLC de-energized.

1) WLC (LLCO) N.C. contacts return to closed condition.

a. Fast fill/flush solenoid (3SOL) energized. Water flushes steam generator drain opening to clear

debris.

2) WLC (LLCO) N.O. contacts return to open condition.

B. LED 2 off. Limiting contactor (1CON) de-energized.

9. Drain (TDR) time elapses.

A. 120VAC removed from drain TDR load terminal.

1) LED 10 off. Drain relay (K3) de-energized. K3 contacts return to normal conditions. Power removed

from WLC.

2) Power removed from drain transformer (2T). Drain valve de-energized and valve closes.

10. Drain water temperature below 120°F. Condensate thermostat (1TAS) contacts return to open condition.

Drain cooling solenoid (1SOL) de-energized.

11. LED's 1, 9, 12 and 13 lit. Draining complete and steamer is off.

Deliming Cycle

NOTE: Allow steam generator to completely drain and the drain valve to close before adding delime solution.

Refer to Installation & Operation manual for deliming procedure.

1. Power switch (1S) off and steam generator empty. LED's and components conditions are in the same state as

outlined at the end of Turning Steamer Off.

2. Press delime switch (2S) to DELIME position (momentary) and hold until delime (4LT) (red) and power (3LT)

(amber) lights are lit (approx. 2 seconds). Release delime switch to return to center off position.

A. LED 15 lit. Delime relay (K2) energized.

1) K2-6/4 N.O. contacts close. Delime light (4LT) lit.

2) Power to delime 1 (TDR) input trigger and delime 1 (TDR) is energized. LED 13 remains lit as in

Turning Steamer off. 120VAC output from load terminal remains on for 3 additional minutes after

power is removed from input trigger to allow heat exchanger to drain (delime valve energized). Total

time 63 minutes unless canceled (delime 2 TDR default time of 60 minutes plus delime 1 TDR of 3

minutes).

a. Delime transformer (3T) powered. Delime valve energized and opens (approx. 10 second

delay while valve motor capacitor charges).

b. Delime valve end switch contacts close.

c. LED 17 lit. Delime relay (K7) energized.

a) K7-5/1 N.C contacts open. X1 potential removed from power switch (1S).

b) K7-5/3 N.O. contacts close. Allows delime 1 (TDR) to remain powered during delime cycle

after K4-6/2 N.C. contacts open.

3) K2-5/1 N.C. contacts open. Power to cooking compartment controls is locked out.

B. LED 14 lit. Delime relay (K4) energized thru K6-5/1 N.C contacts.

1) Delime 2 (TDR) powered thru K4-6/4 closed contacts (N.O.). 120VAC output from delime 2 (TDR)

load terminal for 60 minutes.

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a. Delime relay (K2) remains powered. LED 15 remains lit from pressing delime switch (2S).

b. Power to heating circuit, power light (3LT) (amber) and WLC thru K4-5/3 closed contacts

(N.O.).

a) Steam generator fills and operates as outlined in steps 2A thru 7B under Initial Fill and

Pre-heat with this exception. After pressure switch (1PAS) is satisfied, LED 4 will remain

off and regulating contactor 2 (3CON) will remain de-energized. LED 3 and regulating

contactor 1 (2CON) will cycle on/off as necessary to maintain steam generator pressure.

3. After 60 minutes, time expires on delime 2 (TDR).

A. LED 15 and LED 14 off. Delime relays (K2) and (K4) are de-energized and contacts return to normal

conditions.

1) Power light (3LT) (amber) off.

4. With power removed from delime 1 (TDR) input trigger (K2-6/4 contacts open), delime 1 (TDR) remains

powered thru K7-5/3 N.O. contacts to hold delime relay (K7) energized for a delay on dropout (120VAC

output from load terminal remains on). Allows heat exchanger to drain (delime valve energized) along with

steam generator during the 3 minute (default) drain cycle time.

5. Steamer enters 3 minute drain cycle. Drain cycle operates as outlined in steps 3 thru 8. B. under Turning

Steamer Off. Continue with sequence for remainder of delime cycle operation

A. With drain (TDR) energized (LED 9 lit) (120VAC output from load terminal); and delime 1 (TDR)

powered (LED 13 lit) and receiving voltage to input trigger terminal; and delime valve end switch

contacts closed.

1) Drain relay (K5) is energized thru delime valve end switch closed contacts (N.O.).

a. K5-6/4 contacts close and delime light (4LT) is lit.

b. LED 11 lit. K5-5/3 latching circuit contacts close.

6. After 3 minutes, time expires on drain (TDR) and the drain cycle ends. 120VAC removed from drain TDR load

terminal.

A. LED 10 off. Drain relay (K3) de-energized. K3 contacts return to normal conditions. Power removed from

WLC.

B. Power removed from drain transformer (2T). Drain valve de-energized and valve closes.

1) LED 11 off. Delime relay (K5) de-energized. Latching circuit contacts K5-5/3 return to open

condition. Contacts K5-6/4 return to open condition.

a. Power removed from delime 1 (TDR) input trigger.

b. Delime light (4LT) off.

7. Drain water temperature below 120°F. Condensate thermostat (1TAS) contacts return to open condition.

Drain cooling solenoid (1SOL) de-energized.

8. Time expires on delime 1 (TDR).

A. Delime transformer (3T) is de-energized. Delime valve closes and delime valve end switch contacts

return to open condition.

B. Delime relay (K7) de-energized. Contacts K7-5/3 and K7-5/1 return to normal condition.

9. LED's 1, 9, 12 and 13 lit. Draining complete and steamer is off.

Cancel Deliming

1. Press delime switch (2S) to CANCEL position (off).

A. If delime valve has not opened, the steamer is ready to use (approx. 10 second delay while valve motor

capacitor charges). Allows an unintended delime cycle to be canceled.

B. If delime valve has opened, the steamer will go thru a drain cycle before it can be turned on.

1) LED 16 lit. Delime relay (K6) energized. K6-5/1 N.C contacts open.

a. Delime relay (K4) de-energized.

a) LED 9 lit. K4-6/2 return to N.C condition and drain (TDR) energized.

b) Drain circuit powered. Steam generator drains and shuts off as outlined under Turning

Steamer Off.

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MODEL C24EA - ELECTRICAL OPERATION

SCHEMATIC DIAGRAMS

F35453 (July 2008)

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MODEL C24EA - ELECTRICAL OPERATION

Steam Generator Base

F35453 (July 2008)

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MODEL C24EA - ELECTRICAL OPERATION

WIRING DIAGRAMS

Heating Element Wiring

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MODEL C24EA - ELECTRICAL OPERATION

Cooking Compartment

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MODEL C24EA - TROUBLESHOOTING

TROUBLESHOOTING

Before performing any of the troubleshooting checks listed below, remove the front generator base panel and

check the LED’S on the control board for the status of the condition or component in the operating sequence. By

utilizing the troubleshooting LED’S, the Service Technician can easily determine if a component is functioning

properly or in need of repair. Refer to CONTROL BOARD.

SYMPTOM

POSSIBLE CAUSES

Drain water not being cooled properly.

1. Water supply off or supply pressure incorrect.

2. Condensate thermostat (1TAS) malfunction.

3. Drain cooling solenoid (1SOL) malfunction (clogged).

4. Cavity condensate solenoid (2SOL) not receiving power.

A. Timer malfunction (upper or lower compartment).

B. Control board upper cavity relay (K8); or lower cavity

relay (K9) malfunction.

5. Cavity condensate solenoid (2SOL) malfunction (clogged).

1. Lime scale build-up on water level probes (shorted to ground).

2. Contactor malfunction.

Heat coming on without water in steam

generator.

3. WLC- LLCO contacts stuck closed. Water level control (WLC)

malfunction.

Excessive time for steam generator to reach 1. Supply voltage incorrect.

operating pressure (over 25 min).

2. Heating elements not wired correctly.

3. Contactor(s) malfunction.

4. Steam generator not filled. See Symptom - Steam generator

not filling or is slow to fill.

5. Pressure switch (2PAS) malfunction (not opening).

6. Vacuum relief solenoid (5SOL) energized or stuck open

(steam generator continues to vent and release pressure).

7. Cooking compartment steam solenoid stuck open (steam

inside compartment with timer off).

Steamer leaks water.

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

Water running out of drain during fill.

1. Drain valve (motorized) stuck open.

2. Control board malfunction (drain TDR).

3. Condensate thermostat (1TAS) malfunction.

Steam generator water level too high.

1. Slow fill solenoid (4SOL) or fast fill/flush solenoid (3SOL) does

not shut off.

2. Lime scale build-up on high level probe (open circuit).

3. Water level control malfunction.

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MODEL C24EA - TROUBLESHOOTING

POSSIBLE CAUSES

SYMPTOM

Steamer will not heat.

1. Check incoming voltage.

2. Steam generator not filled. See Symptom - Steam generator

not filling or is slow to fill.

3. Power switch (1S) malfunction.

4. Steam generator high limit (2TAS) open.

5. Heat exchanger high limit (3TAS) open.

6. WLC-LLCO normally open contacts not closed. Water level

control (WLC) malfunction.

7. Control board drain relay (K3) malfunction.

8. Limiting (1CON) contactor malfunction.

9. Pressure switch (1PAS) not adjusted properly or malfunction.

10. Regulating contactor 1 (2CON) malfunction.

11. Relay (K1) malfunction.

12. Regulating contactor 2 (3CON) malfunction.

13. Heating element(s) inoperative.

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

Steam generator not filling or is slow to fill.

1. Water supply off, supply pressure incorrect or filtering system

clogged.

2. Water level control not receiving power. Control board drain

relay (K3) malfunction.

3. WLC-LLCO normally closed contacts are open (no power to

fast fill/flush solenoid 3SOL). Water level control (WLC)

malfunction.

4. Fast fill/flush solenoid (3SOL) clogged or malfunction.

5. WLC-HL normally open contacts are not closing (no power to

slow fill solenoid 4SOL). Water level control (WLC)

malfunction.

6. Slow fill solenoid (4SOL) clogged or malfunction.

7. Drain valve (motorized) stuck open.

8. Pressure switch (2PAS) malfunction (not closed).

9. Vacuum relief solenoid (5SOL) opening is clogged (not

allowing steam generator to vent).

10. Lime scale build-up on water level probes (shorted to ground).

11. Water level control (WLC) malfunction.

1. Worn or damaged door gasket.

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

1. Steamer not level.

Steam leaks around door.

Water leaks around door.

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

3. Worn or gasket Door gasket damaged.

1. Compartment steam solenoid stuck open.

2. Timer malfunction.

Steam generated inside cooking

compartment when timer is off.

Timer motor does not run

1. Door open or door switch malfunction.

2. Timer malfunction.

Door not closing properly.

1. Door latch assembly.

2. Striker adjustment.

Door won’t open.

1. Latch won’t release. See DOOR LATCH ADJUSTMENT.

1. Timer malfunction.

Buzzer not operating.

2. Buzzer malfunction.

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- N O T E S -

F35453 (July 2008)

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