Vulcan-Hart | C24EA3 | Service manual | Vulcan-Hart C24EA3 Service manual

Vulcan-Hart C24EA3 Service manual
SERVICE MANUAL
C24EA SERIES
ATMOSPHERIC
STEAMERS
C24EA3 BASIC SHOWN
C24EA3 208/240V PRO
C24EA3 480V PRO
C24EA5 208/240V PRO
C24EA5 480V PRO
C24EA3 208/240V BASIC
C24EA3 480V BASIC
C24EA5 208/240V BASIC
C24EA5 480V BASIC
ML-136037
ML-136044
ML-136038
ML-136047
ML-136043
ML-136045
ML-136046
ML-136048
- NOTICE This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified. If you have attended a Vulcan Service School for this
product, you may be qualified to perform all the procedures
described in this manual.
This manual is not intended to be all encompassing. If you have
not attended a Vulcan Service School for this product, you should
read, in its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
required to perform the procedure. Procedures for which you do
not have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
Reproduction or other use of this Manual, without the express
written consent of Vulcan, is prohibited.
For additional information on Vulcan-Hart Company or to locate an authorized
parts and service provider in your area, visit our website at www.vulcanhart.com
A product of VULCAN-HART
LOUISVILLE, KY 40201-0696
F25213 (May 2006)
MODEL C24EA - GENERAL
TABLE OF CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
COVERS AND PANELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DOOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
COOKING COMPARTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hold Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High-Limit Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condensate Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
15
15
16
TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
HEATING ELEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SUPER HEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
WATER LEVEL CONTROL COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Level Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Level Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Level Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filtered and Non-Filtered Water Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Drain Valve (Basic) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motorized Drain Valve (Professional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
22
23
23
24
25
26
SWITCHES, BUZZER AND SOLENOIDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vacuum Relief Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
28
29
30
32
33
STEAM GENERATOR TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
ELECTRICAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
36
38
42
45
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
CONDENSED SPARE PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
©VULCAN 2006
F25213 (May 2006)
Page 2 of 52
MODEL C24EA - GENERAL
GENERAL
INTRODUCTION
This manual is applicable to the models and ML numbers listed on the cover page. Procedures apply to all models
unless specified otherwise.
Steam Cooking
Atmospheric steamers offer an efficient way to produce many foods in either small portions or larger batches.
Atmospheric convection steam cooking will steam cook fresh foods or will steam defrost and cook frozen foods
providing the maximum color, flavor and nutritional value with the least expenditure of energy and labor. The
atmospheric steaming compartment allows the operator to open and close the door anytime during a cooking
cycle. The generator element will shut off when the door is opened then re-start when the door is closed.
MODELS COVERED
Model Designations (based on 2.5 inch pan depth)
C24EA3 Three pan - Basic or Professional
C24EA5 Five pan - Basic or Professional
Page 3 of 52
F25213 (May 2006)
MODEL C24EA - GENERAL
SPECIFICATIONS
NOTE: All C24EA steamers, with exception of 480V steamers, are shipped pre-wired for 208/60/3 operation.
Steamer heating element wiring connection change is required if connecting to 208/60/1, 240/60/1 or 240/60/3
electrical service.
ELECTRICAL SPECIFICATIONS
AMPERAGE
MODEL
TOTAL
kW
3 PHASE
Hz.
208V
1 PHASE
240V
480V
L1
L2
L3
L1
L2
L3
L1
L2
L3
208V 240V
C24EA3 - Basic
8.5
50/60
26.5
26.5
17.7
20.5
20.5
20.5
10.3
10.3
10.3
40.9
35.4
C24EA5 - Basic
15.0
50/60
46.8
46.8
31.2
36.1
36.1
36.1
18.0
18.0
18.0
72.1
62.5
C24EA3 - Pro
9.25
50/60
26.5
28.9
20.0
20.5
23.2
23.2
10.2
11.6
11.6
43.6
38.5
C24EA5 - Pro
15.75
50/60
46.8
49.2
33.6
36.1
38.8
38.8
18.0
19.4
19.4
74.8
65.6
WATER SUPPLY REQUIREMENTS
!
Supply pressure should be ........................ 20-60 psig
!
In line strainer for supply line (Supplied)
!
Total dissolved solids (TDS)* .................... less than 60 ppm
!
Total alkalinity ........................................... less than 20 ppm
!
Silica ......................................................... less than 13 ppm
!
Chloride .................................................... less than 4.0 ppm
!
PH factor ................................................... 6.5 to 8
!
Undissolved Solids..................................... less than 5 microns
*17.1 ppm = 1 grain of hardness
Water hardness below 4 grains/gal requires water treatment to reduce
potential corrosion. Hardness above 6 grains/gal should be treated by
water conditioner, water softener or in-line treatment.
Water Conditioning
It is recommended that a local water treatment specialist be consulted before the installation of any steam
generating equipment.
Furnishing the steam generator with properly conditioned water to reduce scale formation is important. Scale
formation will reduce steam output, cause premature component failure and shorten equipment life. Most water
supplies contain scale producing minerals such as calcium and magnesium. As steam is generated, the minerals
remain and dissolve into the remaining water. As the concentration of these minerals increases past a certain
point, they precipitate from the water and coat the inside of the tank, heating elements, thermostat bulbs and water
level probes. Because of the high temperature of these surfaces, the precipitated minerals bake onto them and
become very difficult to remove.
This phenomenon causes several problems:
1. Reduces the heat transfer efficiency of the heaters.
2. Causes premature failure of the heaters.
3. Water level probes will give false readings.
4. Thermostat bulbs will sense temperature incorrectly.
These problems are common to any manufacturer's steamer regardless of design, but they can all be prevented
by furnishing the steam generator tank with properly conditioned water. Vulcan recommends the water contain
less than 60ppm of total dissolved solids (TDS) and have a PH factor between 6.5 to 8.
F25213 (May 2006)
Page 4 of 52
MODEL C24EA - GENERAL
Other chemical properties in water supplies can also affect good steam generation and vary from within each state
and locality.
The water level probes in the steam generator tank use ions in the water to detect the water level. Do not use fully
demineralized or de-ionized water since it is non-conductive and the water level can not be detected.
NOTE: The use of strainers, or filters will not remove minerals from the water.
Steamers that operate over a long period of time without the benefit of properly conditioned water, which have
developed a heavy scale build up, should be cleaned before connecting to a conditioned water supply.
•
Pressure Gauge Assembly
REFERENCE MATERIAL
For replacement parts, refer to Catalog of
Replacement Parts F-43123.
For operation, care and cleaning instructions, refer to
Installation and Operation Manual F-35428.
LUBRICATION
Component
Heating Element
Screws
All NPT Fittings
Door Handle
Sliding Bracket
Lubrication Type
Never Seez
•
Low Pressure Gauge - 0 to 5 psi.
recommended (Grainger Part No. 2C641).
•
Water Hose Coupling - swivel type
(Grainger Part No. 4KG87).
•
Reducer Bushing (Grainger Part No.
6MN61).
•
Pipe thread sealant (as required).
Pipe Thread Sealant, Loctite
565
Lubriplate 630AA
TOOLS
•
•
•
Standard set of hand tools.
VOM with A/C current tester (any quality VOM
with a sensitivity of at least 20K ohms per volt
can be used).
Anti Static Kit, part no. TL - 84919.
Special
•
Torque Wrench - Capable of measuring
70 in*lb.
•
Aluminum Foil Tape - (McMaster-Carr Part No.
7631A21) or equivalent.
Page 5 of 52
F25213 (May 2006)
MODEL C24EA - COVERS AND PANELS
COVERS AND PANELS
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
RIGHT AND LEFT SIDE PANELS
NOTE: Removal of left side panel is identical to the
procedure for the right side panel.
1.
TOP COVER
1.
Remove RIGHT AND LEFT SIDE PANELS.
2.
Remove the screws securing top cover to rear
panel.
3.
Remove the screws securing top cover to front
panel. Screws are located on either side of the
cooking cavity.
4.
Disconnect the delime hose from delime port
fitting.
Remove screws from the bottom of panel being
removed.
2.
Pull bottom of panel out and slide down to clear
top cover.
3.
Reverse procedure to install.
RIGHT SIDE SHOWN
F25213 (May 2006)
5.
Lift top cover off machine.
6.
Reassemble parts removed in reverse order.
7.
Check machine for proper operation.
Page 6 of 52
MODEL C24EA - COVERS AND PANELS
REAR PANEL
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
1.
Remove screws securing top cover to rear
panel and rear panel to steamer frame.
SCREW LOCATION
NOTE: If incoming plumbing or drain interferes with
rear panel removal, turn off water supply and
disconnect plumbing to machine.
2.
Remove LEFT SIDE PANEL.
3.
Disconnect vacuum relief hose from fitting.
TOP COVER REMOVED FOR CLARITY
4.
Pull bottom of rear panel away from machine
and plumbing.
5.
Reassemble parts removed in reverse order.
Page 7 of 52
F25213 (May 2006)
MODEL C24EA - DOOR
DOOR
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL
GASKET
1.
Close door.
1.
Open door.
2.
Remove LEFT SIDE PANEL as outlined in
COVERS AND PANELS.
2.
Remove the shoulder screws and pan pusher
bracket from gasket plate.
3.
Remove nuts from upper hinge located inside
front panel.
4.
Open door slightly, and while holding door, pull
upper hinge away from front panel.
3.
Remove gasket plate.
4.
Remove gasket from inner door panel.
5.
Pull upper hinge out of upper door hinge
bushing.
5.
6.
Lift door assembly up and off lower door hinge.
Remove RTV from bottom part of inner door
panel. Apply new RTV 109 to bottom of door
where shown when assembling gasket to door.
7.
Reinstall parts removed in reverse order of
removal.
8.
Check door for fit and proper sealing of gasket.
6.
Place a small amount of RTV109 into the inner
door panel gasket screw holes before
assembly.
7.
Position the new gasket on gasket plate and
reverse procedure to install.
F25213 (May 2006)
Page 8 of 52
MODEL C24EA - DOOR
Installation
DOOR HANDLE
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.
4.
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.
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.
4.
6.
Install outer door housing onto inner door panel.
7.
Align the top and bottom screw holes of outer
door housing with inner door panel.
8.
Apply Loctite 242 to threads of screws before
assembling.
9.
Install screws to secure door halves together.
Removal
1.
Open door.
2.
Remove screws from top and bottom of door
assembly.
3.
Pull outer door housing away from inner door
panel starting at the hinge side of door to
separate the door halves.
Remove lock nuts and stepped spacers from
threaded studs of door handle.
10. Check opening and closing operation of door.
Page 9 of 52
F25213 (May 2006)
MODEL C24EA - DOOR
Assembly
LATCH ASSEMBLY
1.
Apply Lubriplate 630AA to sides of sliding
bracket.
Separate outer door housing assembly from
inner door panel as outlined under DOOR
HANDLE.
2.
Insert spring pin into bottom of sliding bracket.
Remove screws securing latch assembly to
inner door panel and remove latch mechanism.
3.
Assemble sliding bracket into stationary
bracket.
4.
While holding head of spring pin against bottom
of sliding bracket, insert spring pin into keeper
hole in bottom of stationary bracket.
Removal and Disassembly
1.
2.
3.
A.
Remove E-clip from latch assembly pins and
pull pins from latch mechanism.
A.
Place spring over spring pin.
Secure spring pin in place with retaining
pin.
NOTE: Install pins such that heads of pins will be
facing inward toward hinge side of inner door panel
when latch assembly is installed.
5.
Install pins to assemble stationary and sliding
brackets together.
A.
Secure pins into position with E-clip.
Installation
1.
Install latch assembly onto inner door panel with
spring pin toward bottom of door panel.
A.
4.
Remove retaining pin from spring pin.
5.
Separate sliding bracket from stationary
bracket.
F25213 (May 2006)
Page 10 of 52
Apply Loctite 271 to threads of screws
before assembly and secure latch
assembly to inner door panel.
MODEL C24EA - DOOR
A.
Press hinge bearing fully into door
assembly using a C-clamp or equivalent.
2.
Install outer door housing assembly as outlined
in DOOR HANDLE.
3.
Check opening and closing operation of door.
10. Reassemble parts removed in reverse order.
4.
Check steamer for proper operation and leaks
around door seal.
11. Check door for fit and proper door gasket
sealing.
HINGE BEARINGS
DOOR LATCH ADJUSTMENT
1.
Close door.
2.
Remove LEFT SIDE PANEL as outlined in
COVERS AND PANELS.
3.
Remove nuts from upper hinge located inside
front panel.
4.
Open door slightly, and while holding door, pull
upper hinge away from front panel.
5.
Pull upper hinge out of upper door hinge
bearing.
6.
Lift door assembly up and off lower door hinge.
7.
Pry hinge bearing out from door assembly.
8.
Remove outer door housing.
Opening a Jammed Door
CAUTION: Should the steamer door jam and
cannot be opened, DO NOT FORCE OR PRY the
door as damage will occur.
1. Lift up on bottom of door at the handle end to
disengage latch.
A. If door does not open, remove the right
side panel as outlined in RIGHT AND
LEFT SIDE PANELS.
B. Locate the striker that catches on door
latch near steam chamber on front panel.
C.
Remove the nut from striker and this
should release it from the panel.
CAUTION: Do not drive bearing into place. The
inner door panel could be damaged. Press
bearing into position.
NOTE: When replacing door hinge bearings, replace
both hinge bearings.
9.
Position replacement hinge bearing over hinge
opening in door assembly.
2.
3.
4.
5.
Page 11 of 52
D. Open door.
Remove striker.
Remove any burrs on striker that may cause
latch to stick.
Apply Loctite 271 to threads of striker.
Reinstall striker with slotted side up. Snug
striker nut. Perform Adjustment, so door will not
jam.
F25213 (May 2006)
MODEL C24EA - DRAIN BOX
Adjustment
1. Reinstall striker with slot pointing upward and
hand tighten nut only.
2. Close door to center striker in front panel
mounting hole.
3. Open door and check striker slot for horizontal
alignment. The slot on striker must be kept
horizontal in order for door latch to catch
properly and latch.
4.
Once proper slot alignment has been set, hold
striker close to its base then tighten the striker
nut. Be careful not to damage striker slot when
tightening or door may not latch properly.
NOTE: Do not over-tighten nut. If over-tightened,
striker may turn and change alignment.
NOTE: If door does not open easily, add shims
between striker and cabinet front. When adding
shims make certain that door gasket seals properly
and steamer does not leak. Remove shims as
necessary until leaking stops.
DRAIN BOX
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL AND REPLACEMENT
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A. Turn off water supply.
2. Disconnect the drain plumbing from drain box
outlet fitting.
3. Remove the RIGHT AND LEFT SIDE PANELS
as outlined in COVERS AND PANELS.
NOTE: Use plumbing sealant when reinstalling
condensate thermostat.
4. Disconnect the condensate thermostat electrical
wiring.
A. Remove the condensate thermostat from
drain box.
5. Disconnect the cooling solenoid and cooking
compartment drain hoses.
6.
Disconnect the steam generator drain hose.
1.
NOTE: The steam generator drain hose is accessed
from right side of machine.
F25213 (May 2006)
CLOSE-UP FROM RIGHT SIDE OF STEAMER
7.
Remove the nuts securing drain box to back
plate at rear of steamer.
8. Remove drain box from steamer.
9. Reassemble parts removed in reverse order.
10. Check steamer for proper operation and leaks
around condensate thermostat and hose
connection points.
Page 12 of 52
MODEL C24EA - COOKING COMPARTMENT
COOKING COMPARTMENT
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL AND REPLACEMENT
NOTE: The cooking compartment and front panel
are constructed as an assembly and cannot be
separated.
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
Turn off water supply.
2.
Remove the RIGHT AND LEFT SIDE PANELS
and TOP COVER as outlined in COVERS AND
PANELS.
3.
Remove the DOOR as outlined in HINGE
BUSHING.
A.
4.
7.
Remove both hinges.
Disconnect the drain hose from rear of cooking
compartment.
Remove the timer, indicator light, on/off switch
(Professional models only), striker and door
switch assembly.
NOTE: Screws are located on either side of cooking
compartment securing front panel to lower louvered
panel.
PROFESSIONAL MODEL SHOWN
5.
Remove the vacuum breaker and hose as an
assembly.
6.
Disconnect steam inlet hose from the steam
inlet port.
A.
Remove the steam inlet port.
Page 13 of 52
F25213 (May 2006)
MODEL C24EA - COOKING COMPARTMENT
8.
Remove the screws securing front panel to
lower louvered panel.
9.
Remove the nuts securing rear of cooking
compartment to the vertical mounting brackets
(four places - located between cooking
compartment and steam generator).
10. Remove cooking compartment assembly.
11. If removed or replacing cooking compartment,
install insulation around cooking compartment.
Secure insulation into position using high
temperature aluminum foil tape.
12. Reinstall parts removed in reverse order.
13. Check DOOR LATCH ADJUSTMENT.
F25213 (May 2006)
Page 14 of 52
MODEL C24EA - THERMOSTATS
THERMOSTATS
HOLD THERMOSTAT
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
2.
Remove RIGHT SIDE PANEL and TOP
COVER as outlined under COVERS AND
PANELS.
3.
Remove HEATING ELEMENT.
4.
Loosen hose clamp securing capillary bulb to
top of heating element.
5.
Fully loosen the small capillary tube
compression nut and slide it away from heating
element.
6.
Remove large capillary nut from heater base
plate and slide it away from heating element.
7.
Remove capillary tube from heating element.
8.
Disconnect electrical wiring to high-limit
thermostat.
9.
Remove high-limit thermostat from mounting
bracket.
Turn off water supply.
2.
Remove RIGHT SIDE PANEL as outlined under
COVERS AND PANELS.
3.
Disconnect electrical lead wires from hold
thermostat.
4.
Remove hold thermostat from steam generator
tank.
NOTE: Apply Loctite 565 to threads of hold
thermostat before assembly.
5.
Reassemble parts removed in reverse order of
removal.
6.
Check steamer for proper operation and leaks
around hold thermostat.
HIGH-LIMIT THERMOSTAT
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
Removal
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
Turn off water supply.
Page 15 of 52
F25213 (May 2006)
MODEL C24EA - THERMOSTATS
Installation
1.
2.
CONDENSATE THERMOSTAT
Insert capillary bulb through large compression
nut.
A.
Route capillary bulb through top of heating
element.
B.
Position capillary bulb between top of
second and third heating element coils.
Secure with hose clamp to second coil as
shown.
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
1.
Apply pipe thread sealant to threads of large
capillary nut then install large compression nut.
A.
Pull excess capillary tubing out of heating
element through large nut. Route capillary
tubing such that there are no sharp bends.
B.
Tighten the small capillary compression nut
into the large compression nut.
NOTE: Install a new gasket when reassembling
steam generator tank. Temporarily secure gasket in
place with RTV109.
3.
Reinstall remaining parts removed in reverse
order.
4.
Torque heating element screws to 70 in*lb
following the heating element tightening
sequence as found under HEATING ELEMENT.
5.
Check steamer for proper operation and leaks
around heating element gasket and high-limit
thermostat.
F25213 (May 2006)
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
Turn off water supply.
2.
Remove LEFT SIDE PANEL as outlined in
COVERS AND PANELS.
3.
Disconnect electrical wiring to condensate
thermostat.
4.
Remove condensate thermostat from drain box.
5.
Reassemble parts removed in reverse order of
removal. Make certain to apply Loctite 565
thread sealant to threads of thermostat before
assembly.
6.
Check steamer for proper operation and leaks
around condensate thermostat.
Page 16 of 52
MODEL C24EA - TIMER
TIMER
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL AND REPLACEMENT
NOTE: The basic and professional model steamers
use the same 60 minute timer. When the timer
reaches zero, an external buzzer will sound and
steam will stop entering the cooking compartment.
The Professional steamer has extra components to
utilize the constant steam setting allowing the
steamer to operate continuously.
1.
Remove RIGHT SIDE PANEL as outlined under
COVERS AND PANELS.
2.
Note electrical connections then disconnect
wiring to timer.
4.
Reverse procedure to install.
5.
Check steamer for proper operation.
PROFESSIONAL MODEL SHOWN
3.
Pull knob from timer shaft.
A.
Remove rotary shaft seal from timer shaft
then remove timer from front panel.
B.
Inspect rotary shaft seal. Replace if
damaged, worn or signs of moisture
migration into control area around timer
shaft is evident.
Page 17 of 52
F25213 (May 2006)
MODEL C24EA - HEATING ELEMENT
HEATING ELEMENT
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL AND REPLACEMENT
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
Remove RIGHT SIDE PANEL and TOP
COVER as outlined under COVERS AND
PANELS.
3.
Note heating element wire connection points
then disconnect heating element lead wires
from contactors.
7.
Note mounting position of high-limit thermostat
bulb then remove bulb from heating element.
A.
8.
Carefully position high-limit thermostat capillary
tube to facilitate heating element removal.
Avoid creating sharp bends or kinks in the
capillary tube.
Remove screws and lock washers securing
heating element to tank.
F25213 (May 2006)
Remove high-limit capillary tube
compression fitting and remove high-limit
capillary and bulb from heating element.
NOTE: Install a new gasket when reassembling
steam generator tank. Temporarily secure gasket in
place with RTV109.
BASIC MODEL SHOWN
5.
Pull heating element out of steam generator
tank.
Turn off water supply.
2.
4.
6.
Remove gasket from steam generator tank.
A.
Clean remaining sealant from top lip of
steam generator tank.
NOTE: Refer to HIGH-LIMIT THERMOSTAT for
proper placement of capillary bulb.
Page 18 of 52
MODEL C24EA - HEATING ELEMENT
9.
Reassemble parts removed in reverse order of removal. Tighten heating element screws evenly to 70 in*lbs.
Follow tightening sequence pattern as shown in illustration.
OVERHEAD VIEW OF HEATING ELEMENT
10. Check steamer for proper operation and leaks around heating element.
DIAGNOSTIC CHECKS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS
WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT
PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
1. Check voltage across heating element wires at limiting and regulating contactor terminals.
A. If voltage is correct, check current draw (step 2).
B. If voltage is not correct, check the following:
1) Voltage supply to steamer.
2) Fuses or breaker blown.
3) Power to contactor coils.
4) Contactors not pulling in. (Mechanical)
2. Check current draw (amps) through heating element lead wires using an amp clamp meter.
A. If current is correct, then heating element is ok.
B. If current is not correct, check element resistance (step 3).
3. Remove one lead wire of each heating element from the regulating contactor and check the individual
element resistance using a VOM.
A. If resistance readings are not correct, replace heating element.
MODEL
3 Pan
5 Pan
2
3
RESISTANCE PER ELEMENT
(OHMS)
20.4
20.4
27.1
11.5
15
20.8
11.5
15
18.1
15.3
TOTAL kW
208 1
240 2
480Y/277 3
208
240
480Y/277
1
8.5
8.5
8.5
15
CURRENT PER
ELEMENT
10.2
11.8
10.2
18.0
VOLTAGE
3
Four elements used.
Three elements used.
Elements of 480V machines are connected in Wye configuration for 277V across each element.
NOTE: Values in table are nominal. Tolerance is ±10 %.
4.
Check steamer for proper operation.
Page 19 of 52
F25213 (May 2006)
MODEL C24EA - SUPER HEATER
SUPER HEATER
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
B.
REMOVAL AND REPLACEMENT
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
7.
Check to make sure insulated piping assembly
is horizontal or element head end of assembly
is slightly elevated.
8.
Check steamer for proper operation and leaks
around super heater.
9.
Reinstall panels and top cover.
Turn off water supply.
2.
Remove RIGHT SIDE PANEL as outlined under
COVERS AND PANELS.
3.
Note super heater wiring connection points then
disconnect heating element lead wires from the
relay (K4) and the regulating contactor.
4.
Peel back insulation from head of heater
element.
5.
Remove super heater element from insulated
piping assembly.
NOTE: Top cover removed for clarity. Removal of
top cover is not necessary to service super heater.
6.
Reassemble parts removed in reverse order of
removal.
A.
Apply pipe thread sealant to threads of
super heater element before assembly.
F25213 (May 2006)
Tape insulation around head of heater
element using high-temperature aluminum
foil tape.
Page 20 of 52
MODEL C24EA - SUPER HEATER
DIAGNOSTIC CHECKS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS
WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT
PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
1.
2.
3.
Check voltage across super heater wires at limiting and regulating contactor terminals.
A.
If voltage is correct, check current draw (step 2).
B.
If voltage is not correct, check the following:
1)
Voltage supply to steamer.
2)
Fuses or breaker open.
3)
Relay K4.
4)
Power to contactor coils.
5)
Contactors not pulling in. (Mechanical)
Check current draw (amps) through super heater lead wires using an amp clamp meter.
A.
If current is correct, then super heater is ok.
B.
If current is not correct, check resistance (step 3).
Remove one of the super heater lead wires from the regulating contactor and check resistance using a VOM.
A.
If resistance is not correct, replace super heater.
VOLTAGE
208/240
480Y/277 1
1
TOTAL kW
0.75
0.75
CURRENT
3.1
2.7
RESISTANCE (OHMS)
76.8
102.3
Elements of 480V machines are connected in Wye configuration for 277V across super heater.
NOTE: Values in table are nominal. Tolerance is ±10 %.
4.
Check steamer for proper operation.
Page 21 of 52
F25213 (May 2006)
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS
WATER LEVEL CONTROL COMPONENTS
WATER LEVEL CONTROLS
Low Level Cut-Off & Differential Control
The steamer is equipped with three water level
sensing probes (high, low and low level cut-off) and
a water level control board. The water level control
board performs two functions: 1) Provide low level
cut-off protection to shut off the heat source in case
the water level drops below the low level cut-off
(LLCO) probe. 2) Perform as a differential level
control to maintain the water level between the low
and high water level probes.
The water level control (WLC) board has input
voltage (120VAC) across terminals 11 and 12 which
powers the primary side of the transformer. On one
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
board relay coils (LLCO and HL) and to the inverse
latching relay (ILR) electronic circuit on the WLC
board. As water enters the generator, it becomes
part of the WLC board circuit. When the water level
in the generator reaches a probe, that circuit is
completed.
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 generator and
the HL LED is lit. The HL relay and LED will toggle
on and off during a cooking cycle as needed.
The inverse latching relay of the WLC board is deenergized, leaving the ILR-1 (N.O.) and ILR-2 (N.C.)
contacts in their shelf state.
When the main power switch is turned on, power is
supplied to the WLC board which energizes the high
level (HL) relay, closes HL-1 normally open contacts,
and illuminates the HL relay LED. With the HL-1
contacts closed, the slow fill solenoid is energized
and water begins filling the generator.
When the water level reaches the low level cut-off
(LLCO) probe, the LLCO relay is energized and
illuminates the LLCO LED. With the LLCO-1 contacts
closed, the heat source can be energized provided
the auxiliary control(s) in the heating circuit are
satisfied. The LLCO relay will remain energized and
its LED will stay lit until the water level in the
generator drops below the LLCO probe.
When the water level reaches the low level (LL)
probe, power to terminal 2 on the WLC board is
present but no switching occurs.
After the water level reaches the high level (HL)
probe, the inverse latching relay of the WLC board is
energized and locked through the low level probe
(LL) and ILR-1 contacts. With ILR-2 contacts open,
HL relay is de-energized and the HL LED goes out.
With the HL-1 contacts open, the slow fill solenoid is
de-energized, stopping the flow of water into the
generator.
F25213 (May 2006)
Page 22 of 52
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS
WATER LEVEL CONTROL
BOARD
WATER LEVEL PROBES
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
CAUTION: Certain components in this system
are subject to damage by electrostatic discharge
during field repairs. A field service grounding kit
is available to prevent damage. The field service
grounding kit must be used anytime the control
board is handled.
1.
Remove RIGHT SIDE PANEL as outlined under
COVERS AND PANELS.
2.
Squeeze tab on plastic standoff to release
circuit board from standoff. Water level control
board is secured with pins in five locations.
1.
Remove RIGHT SIDE PANEL and TOP
COVER 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
Water Level
Controller
# 5 A - Blue
HL - High Level
Probe
L
# 6 B - Yellow
LL - Low Level
Probe
G
3.
3.
Note electrical wiring connection points then
disconnect lead wires from water level control
board (WLC). Refer to the machine wiring
diagram when installing water level control
board.
4.
Reassemble parts and wiring removed in
reverse order of removal.
5.
Check steamer for proper operation.
Water Level
Probe
H
LLCO
A.
Wiring
LLCO - Low
Level Cut Off
# 7 C - Red
# 8 - Green
Disconnect ground wire.
Ground
Remove probe assembly from piping assembly.
NOTE: Probes should be cleaned thoroughly.
Remove all accumulated deposits from insulator
using a soft cloth. Do not use anything abrasive on
insulators. If probes are dirty, delime steam
generator tank after assembling.
NOTE: Apply Loctite 565 to threads of probe
assembly before installation.
4.
Reverse procedure to install.
A.
Page 23 of 52
Set spacing between probe assembly
flange and reducing Tee between 0.490" to
0.550".
F25213 (May 2006)
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS
DUAL WATER VALVE FLOW RATES
Flow Rate (GPM)
Machine
Valve Type
Fast
Flow Slow Flow
Type
Valve
Valve
Fill (Filtered
3 & 5 Pan
4.8
0.15
Water)
Condensate
3 - Pan
4.8
0.75
(Non-Filtered
5 - Pan
4.8
1.35
Water)
Filtered Water Solenoid Valve
1.
NOTE: Perform a steam generator tank cleaning as
outlined under STEAM GENERATOR TANK CLEANING.
FILTERED AND NON-FILTERED
WATER SOLENOID VALVES
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
Turn off water supply.
2.
Disconnect the incoming filtered water hose to
machine.
3.
Remove the REAR PANEL as outlined under
COVERS AND PANELS.
4.
Remove the screws securing the solenoid valve
to the back plate.
5.
Pull solenoid valve toward right side of machine
enough to access electrical connections.
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
NOTE: The filtered and non-filtered water solenoid
valves are constructed as dual water valve
assemblies. To differentiate between the fast and
slow fill valves, hold the dual water valve assembly
with the inlet up and the outlets facing forward. The
fast flow valve is the left valve and the slow flow
valve is the right valve. The two dual assemblies
used on the steamer have different flow rates and
should not be interchanged.
DUAL WATER VALVE
F25213 (May 2006)
Page 24 of 52
A.
Note connection points of electrical wires
then disconnect wires from solenoid valve.
B.
Disconnect hoses from solenoid valve then
remove solenoid valve from steamer.
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS
6.
Reassemble parts removed in reverse order of
removal.
7.
Verify that the filtered water supply is connected
to the input of the filtered water solenoid valve.
8.
Check steamer for leaks and proper operation.
MANUAL DRAIN VALVE (BASIC)
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
Non-Filtered Cold Water Solenoid Valve
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
Turn off water supply.
2.
Disconnect incoming water hose to non-filtered
cold water solenoid valve.
3.
Remove LEFT SIDE PANEL as outlined in
COVERS AND PANELS.
4.
Note connection points of electrical connections
then disconnect wiring from solenoid valve.
Removal
1.
Pull out handle to turn off machine and drain
steam generator tank. Allow steamer to
complete drain cycle.
A.
Turn off water supply.
2.
Remove the RIGHT SIDE PANEL as outlined in
COVERS AND PANELS. Rear panel can also
be removed for added accessibility.
3.
Remove the pin and disconnect the handle
linkage from linkage bracket.
VIEW FROM LEFT SIDE OF STEAMER
5.
Remove the screws securing non-filtered cold
water solenoid valve to back plate.
6.
Note hose connections to solenoid valve then
disconnect hoses from valve.
4.
Remove the on/off switch and bracket as an
assembly.
A.
5.
Disconnect the drain and drain flush hoses from
the Tee located below the drain valve.
6.
Remove the drain valve from the steam
generator tank.
7.
Remove solenoid valve from steamer.
Reassemble parts removed in reverse order of
removal.
A.
Connect the outputs of the non-filtered
water cooling solenoid to the drain box and
Tee mounted to the drain valve under the
steam generator.
8.
Verify that the non-filtered water supply is
connected to the input of the non-filtered water
solenoid valve.
9.
Check steamer for leaks and proper operation.
Page 25 of 52
F25213 (May 2006)
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS
NOTE: Apply pipe thread sealant to plumbing
threads before assembly.
7.
Reassemble parts removed in reverse order of
removal.
8.
For Basic model steamers, perform ON/OFF
SWITCH ADJUSTMENT as outlined in ON/OFF
SWITCH.
9.
Check steamer for leaks and proper operation.
A.
Rotate knob CW to manually open the
drain valve. Turning knob such that the slot
in knob is in a vertical orientation indicates
the drain valve is open. If slot in knob is in
a horizontal orientation, the drain valve is
closed.
B.
Return manual drain override knob to the
closed position (slot in horizontal position).
MOTORIZED DRAIN VALVE
(PROFESSIONAL)
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
1.
Turn steamer off by using the on/off switch on
the front panel of steamer.
A.
Allow steamer to complete drain cycle.
Removal
B.
If motorized drain valve has malfunctioned
such that tank will not drain normally, refer
to Drain Tank Manually for draining
procedure.
1.
Turn off water supply to steamer.
2.
Remove the RIGHT SIDE PANEL as outlined in
COVERS AND PANELS. Rear panel can also
be removed for added accessibility.
3.
Rotate body of motorized control assembly
CCW approximately 1/8 turn to disengage
assembly from drain valve.
4.
Remove the motorized control assembly.
Drain Tank Manually
1.
Turn off water supply to steamer.
2.
Disconnect power to steamer allowing time for
water in steam generator tank to cool to 140EF
before attempting to manually open drain valve.
3.
Remove the RIGHT SIDE PANEL as outlined in
COVERS AND PANELS. Rear panel can also
be removed for added accessibility.
4.
Locate the motorized drain valve found at lower
right side of steam generator tank.
NOTE: The two electrical plugs on the motorized
control assembly are the same type connector. If the
electrical wiring is not connected correctly, the
motorized drain valve will not function.
5.
A.
Push in on the manual drain override knob to
disengage the gear set.
F25213 (May 2006)
Page 26 of 52
Note location of electrical connections then
disconnect electrical wiring from motorized
control assembly.
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS
5.
Disconnect the drain and drain flush hoses from
the Tee located below the drain valve.
6.
Remove the drain valve body from the steam
generator tank.
7.
Separate the Tee and nipple from the drain
valve body.
8.
Reassemble parts removed in reverse order.
Apply liquid pipe thread sealant to threads of
plumbing connections.
NOTE: If motorized drain valve is in the open
position when power is applied to the steamer with
the power switch on, drain valve will not close and fill
water will flow through the generator into the drain.
9.
Verify On/Off switch is in the off position and the
motorized drain valve is closed before applying
power to steamer.
NOTE: When power is applied and power switch is
off steamer will enter a drain cycle.
10. Check steamer for proper operation and leaks
around drain valve.
Page 27 of 52
F25213 (May 2006)
MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS
SWITCHES, BUZZER AND SOLENOIDS
ON/OFF SWITCH
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
Basic Models
1.
Pull out on handle to turn steamer off and drain
generator tank.
2.
Remove the RIGHT SIDE PANEL.
3.
Locate the on/off switch assembly mounted to
the manual drain valve.
4.
Note wiring locations and disconnect electrical
wiring from switch.
5.
Remove switch from switch mounting bracket.
Retain hardware.
6.
Loosely install switch onto switch mounting
bracket.
7.
Perform Basic Model On/Off Switch Adjustment as outlined in this section.
8.
Connect electrical wiring to switch.
9.
Check steamer for proper operation.
2.
Continue pushing handle in until handle is at
physical stop.
A.
If switch plunger over-travel range is
between 0.060" - 0.090" once switch N.O.
contacts close, switch setting is correct.
B.
If contacts did not close, or, there was no
over-travel of switch plunger once contacts
closed, switch position must be adjusted.
Refer to Basic Model On/Off Switch Adjustment for procedure.
Basic Model On/Off Switch - Adjustment
1.
Position switch mounting bracket on drain valve
in middle of adjustment slot.
A.
Tighten switch bracket to drain valve.
Basic Model On/Off Switch - Check Switch
Actuation
NOTE: Handle must be pushed all the way in to
avoid nuisance tripping.
1.
Push handle in until switch contacts close. This
can be checked with a meter set to measure
resistance or continuity with meter probes
across the COMMON and NORM OPEN
terminals of switch.
2.
F25213 (May 2006)
Page 28 of 52
Loosen on/off switch mounting screws.
MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS
3.
Push handle fully in and keep in position.
3.
Disconnect electrical plug from switch.
4.
Position plunger of on/off switch against linkage
bracket such that plunger is fully engaged.
4.
Remove switch from front panel.
5.
Reassemble parts removed in reverse order.
DOOR SWITCH
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
Removal
A.
B.
1.
Remove the RIGHT SIDE PANEL.
2.
Open cooking compartment door.
3.
Note wiring connections and disconnect
electrical wiring from switch.
4.
Remove switch from door switch mounting
bracket. Retain hardware.
Adjust switch such that switch plunger is
perpendicular with linkage bracket when
handle is pushed in fully.
Tighten switch mounting screws.
Professional Models
1.
Remove the RIGHT SIDE PANEL.
2.
Locate the on/off switch mounted to the front
panel.
Installation
1.
Verify E-clip is installed on door switch linkage
in groove nearest front panel (if two grooves in
linkage are present).
2.
Loosely install door switch onto door switch
mounting bracket.
Page 29 of 52
F25213 (May 2006)
MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS
3.
A.
Close door.
B.
Push switch up against switch linkage as
far as possible.
C.
Tighten switch mounting hardware.
Check door switch operation.
A.
Set meter to measure resistance and place
meter leads across the COMMON and
NORM OPEN terminals of switch. With
door closed, meter should indicate a
closed circuit.
B.
Open door. Meter should indicate an open
circuit as door is opened.
4.
Check steamer for proper operation.
5.
Reinstall RIGHT SIDE PANEL.
3.
PROFESSIONAL MODEL SHOWN
Disconnect electrical wiring to pressure switch.
4.
Remove pressure switch from piping.
5.
Reassemble parts removed in reverse order.
PRESSURE SWITCH
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
A.
Apply pipe thread sealant to threads of
pressure switch before installation.
B.
Verify mylar cover is in position covering
electrical connections.
WARNING: CERTAIN PROCEDURES IN THIS
SECTION REQUIRE ELECTRICAL TEST OR
MEASUREMENTS WHILE POWER IS APPLIED TO
THE MACHINE. EXERCISE EXTREME CAUTION
AT ALL TIMES. IF TEST POINTS ARE NOT EASILY
ACCESSIBLE, DISCONNECT POWER AND
FOLLOW LOCKOUT / TAGOUT PROCEDURES,
ATTACH TEST EQUIPMENT AND REAPPLY
POWER TO TEST.
Removal
NOTE: For basic models, the pressure switch can be
accessed by removing the right side panel. It is not
necessary to remove the top cover.
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
2.
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.
C.
Turn off water supply.
Remove RIGHT SIDE PANEL as outlined in
COVERS AND PANELS. Locate pressure
switch on top of water level probe piping
assembly.
A.
If servicing a Professional model, remove
the TOP COVER as outlined in COVERS
AND PANELS.
F25213 (May 2006)
Page 30 of 52
If pressure switch is being replaced, make
an initial pressure switch setting by aligning
the top surface of adjustment wheel with
the 5 psi reference scale mark on pressure
switch.
MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS
6.
Perform pressure switch Check.
B.
Check
NOTE: Pressure can be checked with the small air
pocket that exists between the delime port cap and
water level probe housing in the delime hose. Make
certain that no leaks exist in generator tank or
pressure gauge fittings.
1.
NOTE: Operating pressures will vary slightly
between machine being serviced and gauge used.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
C.
Turn off water supply.
2.
Remove RIGHT SIDE PANEL as outlined in
COVERS AND PANELS.
3.
Remove cap from delime port and install
pressure gauge.
Wait for full steam production to stabilize.
This is accomplished by allowing
approximately five cycles of fill to occur
once steam is being produced by the
generator tank. Observe LED on water
control board to count cycles.
Observe pressure gauge once steam
begins to be generated. Gauge should
level out at approximately 1.25 to 2.0 psi,
but will oscillate with respect to fill water
entering generator tank.
TYPICAL OPERATING PRESSURE
4.
Close cooking compartment door.
5.
Mark one tooth of pressure switch adjustment
wheel to aid in identifying position of wheel.
Make a second mark on body of pressure
switch in alignment with mark on adjustment
wheel.
6.
NOTE: If pressure should rise above 5.0 psi when
performing check, release clamp. Pressure switch is
out of tolerance and must be adjusted. Refer to
Adjustment for procedure.
7.
While observing pressure gauge, clamp steam
outlet hose closed.
A.
Listen for contactors to release indicating
that pressure switch contacts have
opened. Correct range for pressure switch
cut out is between 4.5 to 4.7 psi.
B.
Release clamp from steam outlet hose.
Listen for switch contacts to close
(contactors will energize).
Turn steamer on.
A.
Set timer for approximately 10 minutes.
Page 31 of 52
F25213 (May 2006)
MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS
8.
C.
Repeat clamping of steam outlet hose a
total of three times to find the average cutout pressure. Record pressure.
D.
If pressure is outside tolerance (4.5 to 4.7
psi), adjustment is necessary. Refer to
Adjustment.
E.
If cut-out pressure is within specifications,
shut off steamer. Allow time for steamer to
drain.
Remove test gauge and reinstall delime cap.
Adjustment
1.
Allow full steam production to stabilize. This is
accomplished by allowing approximately five
cycles of fill to occur once steam is being
produced by the generator tank. Observe LED
on water control board to count cycles.
NOTE: Make small incremental adjustments (1/8
turn of toothed adjustment wheel) when adjusting
cut-out pressure. Wear a heat resistant glove when
working near hot surfaces such as when adjusting
pressure switch.
2.
VACUUM RELIEF SOLENOID
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
NOTE: The vacuum relief solenoid on Professional
models is positioned with the solenoid coil toward the
cooking chamber away from the super heater. For
Basic models, the vacuum relief solenoid is
positioned with the coil toward the right side of
machine for easier serviceability.
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
2.
Turn off water supply.
Remove RIGHT SIDE COVER as outlined in
COVERS AND PANELS. Locate vacuum relief
solenoid on top of water level probe piping
assembly.
Referring to cut-out pressure recorded in Check
procedure, turn adjustment wheel to bring cutout pressure into tolerance.
A.
From looking down on pressure switch:
1)
Turn adjustment wheel CCW to
decrease cut-out pressure.
2)
Turn adjustment wheel CW to
increase cut-out pressure.
PROFESSIONAL MODEL SHOWN
3.
Disconnect hose from solenoid valve.
4.
Disconnect electrical wiring to solenoid coil.
5.
Remove retaining clip securing coil to valve
body then remove coil and wavy washer.
CAUTION: Do not force the super heater piping
assembly out of position to make clearance for
vacuum relief solenoid valve body removal.
Damage to generator tank weldment could occur.
B.
Check cut-off pressure after making
adjustment. Repeat Check and Adjustment
as necessary until cut-out pressure is
within 4.5 to 4.7 psi.
F25213 (May 2006)
NOTE: It may be necessary to turn the piping elbow
that connects the vacuum relief solenoid to the water
level piping assembly in order to clear the super
heater piping assembly when removing the valve
body.
6.
Remove the valve body from piping assembly.
7.
Reassemble parts removed in reverse order.
Page 32 of 52
MODEL C24EA - SWITCHES, BUZZER AND SOLENOIDS
A.
Install valve with the inlet (ON) side of
valve connected to the back panel port and
the outlet (OFF) side of valve connected to
the water level control plumbing. Apply
liquid thread sealant to threads of piping
before assembly.
7.
Reassemble parts removed in reverse order.
Perform DOOR LATCH ADJUSTMENT as
outlined under DOOR.
BUZZER
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
1.
Remove the RIGHT SIDE PANEL.
2.
Locate the buzzer which is mounted above the
door switch near the front of steamer.
3.
Disconnect electrical wiring from the buzzer and
door switch.
4.
Remove door striker.
5.
Remove remaining hardware securing door
switch mounting bracket to front panel then
remove door switch mounting bracket, door
switch and buzzer as an assembly.
6.
Remove buzzer from door switch mounting
bracket.
Page 33 of 52
F25213 (May 2006)
MODEL C24EA - STEAM GENERATOR TANK
STEAM GENERATOR TANK
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL AND REPLACEMENT
1.
Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A.
Turn off water supply.
2.
Remove the TOP COVER, RIGHT and REAR
PANEL as outlined under COVERS AND
PANELS.
3.
Disconnect electrical wiring then remove HOLD
THERMOSTAT.
4.
Disconnect the fill union fitting.
7.
Disconnect steam outlet hose from tank fitting
or super heater fitting (super heater on
Professional model only).
8.
Remove HEATING ELEMENT.
NOTE: It is not necessary to disconnect the electrical
wiring to the motorized drain valve in order to
remove the motor section of valve.
5.
Remove the drain valve controlling mechanism.
A.
For Pro models, refer to MOTORIZED
DRAIN VALVE and remove the motor
section of valve.
B.
For Basic models, refer to MANUAL
DRAIN VALVE and disconnect the linkage
from valve. Remove the on/off power
switch and bracket as an assembly.
PROFESSIONAL MODEL SHOWN
9.
NOTE: Water level probe assembly is to be removed
from the steam generator tank once the steam
generator is removed from the steamer.
6.
Disconnect the drain flush solenoid hose and
drain hose from the Tee located below the drain
valve.
F25213 (May 2006)
Page 34 of 52
If Pro model, disconnect the super heater
electrical wiring.
A.
Remove the super heater element and
super heater housing as an assembly at
the top machined elbow.
MODEL C24EA - STEAM GENERATOR TANK
10. Remove remaining steam outlet elbow plumbing
from steam generator tank.
18. Reinstall parts removed in reverse order of
removal. Apply liquid thread sealant to all pipe
threads connected to the steam generator tank.
Do not apply thread sealant to fill union fitting.
19. Torque heating element screws to 70 in*lb
following the heating element tightening
sequence as found under HEATING ELEMENT.
20. Check steamer for proper operation. Inspect
inlets/outlets and gasket seal of steam
generator tank for leaks.
11. Remove delime hose from water level probe
assembly.
12. Remove hose from the vacuum relief solenoid.
13. Note wiring connection points and remove the
electrical wires from the VACUUM RELIEF
SOLENOID, WATER LEVEL PROBES and
PRESSURE SWITCH.
NOTE: Install a new gasket when reassembling
steam generator tank. Temporarily secure gasket in
place with RTV109.
14. Remove gasket from steam generator tank.
A.
Clean remaining sealant from top lip of
steam generator tank.
15. Remove hardware securing steam generator
tank to machine frame (three places) then
remove tank from machine.
16. Remove water level probe assembly from tank.
17. If removed or replacing generator tank, install
insulation around generator tank. Secure into
position using high temperature aluminum foil
tape.
Page 35 of 52
F25213 (May 2006)
MODEL C24EA - ELECTRICAL OPERATION
ELECTRICAL OPERATION
COMPONENT FUNCTION
Water Level Control (WLC) Board . . . . . . . . . Controls water level by monitoring conditions of the three water
level probes H, L and LLCO.
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Creates audible signal when timed cook cycle is complete.
Contactor, Limiting . . . . . . . . . . . . . . . . . . . . . Connects one side of heating elements to incoming power.
Energized whenever WLC (LLCO) coil is energized.
Contactor, Regulating . . . . . . . . . . . . . . . . . . . Connects one side of heating elements to power. On constantly
during cooking cycle.
Drain Valve, Motorized (Ball type) . . . . . . . . . . (Professional models only) Motorized control for opening and
closing drain valve.
Element, Heating . . . . . . . . . . . . . . . . . . . . . . . Located in steam generator tank. Heats water to produce steam.
Element, Super-heater . . . . . . . . . . . . . . . . . . . (Professional models only) Located in piping from steam
generator tank to cooking chamber. Provides additional energy
to raise steam temperature.
Fuse, (1FU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slow blow 4A fuse. Located on primary side of main
transformer. Protects control circuitry from over-currents.
Fuse, (2FU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slow blow 4A fuse. Located on primary side of main
transformer. Protects control circuitry from over-currents.
Lamp (3LT), Power . . . . . . . . . . . . . . . . . . . . . Amber (AM) colored lamp. On when power switch is on.
Lamp (2LT), Cook . . . . . . . . . . . . . . . . . . . . . . Red (RD) colored lamp (Professional models only). On when
hold thermostat is satisfied and door is closed and timer is set.
Lamp (1LT), Ready . . . . . . . . . . . . . . . . . . . . . Green (GN) colored lamp (Professional models only). On when
cycling thermostat is satisfied. Latches on when hold thermostat
is satisfied.
Probe (H) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High water level probe connected to internal latch relay circuit.
Water must reach this level before internal latch relay is
energized.
Probe (L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low water level probe connected to internal latch relay circuit.
Probe (LLCO) . . . . . . . . . . . . . . . . . . . . . . . . . . Low Level Cut-Off (LLCO) probe. Controls power to heating and
timer circuitry. Controls fast fill solenoid (Professional models
only).
Relay (K1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Controlled by hold thermostat. Enables timer circuit.
Relay (K2), LLCO . . . . . . . . . . . . . . . . . . . . . . . Low Level Cut-Off (LLCO) external relay. Only energized during
drain. Controls Flush, Fast Fill and Vacuum Relief solenoids.
Relay (K3), Drain Relay . . . . . . . . . . . . . . . . . . Controlled by Time Delay Relay. Only energized during drain
cycle. Controls WLC board and LLCO relay K2 during drain.
Disables heating and timer circuitry.
Relay (K4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (Professional models only) Latches Ready light on. Allows
power to superheater.
Relay, Time Delay . . . . . . . . . . . . . . . . . . . . . . Controlled by the power switch. Output becomes active for 90
seconds when power switch is turned to off. Only used during
drain cycle.
Solenoid (1SOL), Cooling . . . . . . . . . . . . . . . . Controlled by the condensate thermostat. Mixes cold water with
hot condensate water from cooking chamber to reduce water
temperature at drain.
Solenoid (2SOL), Flush . . . . . . . . . . . . . . . . . . On only during drain cycle. Mixes cold water with tank water
before entering drain box. Keeps drain hose clear of debris.
Solenoid (3SOL), Fast Fill . . . . . . . . . . . . . . . . Initial tank fill for Professional machines. Used during last stage
of drain cycle to flush drain opening free of debris.
F25213 (May 2006)
Page 36 of 52
MODEL C24EA - ELECTRICAL OPERATION
Solenoid (4SOL), Slow Fill . . . . . . . . . . . . . . . Primary fill for Basic machines and secondary fill for
Professional machines. Energized as necessary during
operation to replenish water in generator tank.
Solenoid (5SOL), Vacuum Relief . . . . . . . . . . . Provides open air line for vacuum relief during drain cycle to
prevent cooking chamber flex.
Switch (1S), Power . . . . . . . . . . . . . . . . . . . . . Rocker switch on Professional machines and linkage activated
plunger switch on Basic machines. Two position switch that
controls machine steam and drain operations.
Switch (2S), Door . . . . . . . . . . . . . . . . . . . . . . . Plunger activated, switch is wired in series with timer. When
switch is closed and timer is set to a time or constant, regulating
contactor will be energized 100% of the time once ready light is
on (hold thermostat satisfied).
Switch (1PAS), Pressure . . . . . . . . . . . . . . . . . Pressure cut-out protection. Range is between 4.5 to 4.7 psi.
Cuts off electrical energy to controls circuit if pressure is above
set pressure.
Thermostat (1TAS), Condensate . . . . . . . . . . Monitors temperature of water entering the facility drain system.
Controls the cooling solenoid during cooking operation and the
cooling and flush solenoids during drain cycle (135E F cut-in).
Thermostat (2TAS), High-Limit . . . . . . . . . . . Protects against heating element over-temperatures generally
caused by tank boiling dry. Capillary style device. Bulb is
mounted directly to the heating element and body is bracket
mounted to frame rail (257E F cut-out).
Thermostat (3TAS), Hold . . . . . . . . . . . . . . . . Controls temperature of water in steam generator tank to 195EF
(closes at 195E F).
Timer (1TR) . . . . . . . . . . . . . . . . . . . . . . . . . . . Used for timed cook cycles from 0 to 60 minutes. Professional
models have a CONSTANT position for continuous steam
operation.
Transformer (1T), Main . . . . . . . . . . . . . . . . . . Step down transformer from line voltage to control voltage level
(120VAC).
Transformer (2T), Drain . . . . . . . . . . . . . . . . . (Professional models only) Provides 24VAC for motorized drain
valve during drain cycle.
Page 37 of 52
F25213 (May 2006)
MODEL C24EA - ELECTRICAL OPERATION
COMPONENT LOCATION
Electrical Control Panel
NOTE: Relay K4 and transformer T2 are present on Professional models only.
F25213 (May 2006)
Page 38 of 52
MODEL C24EA - ELECTRICAL OPERATION
Water Level Control Board
Page 39 of 52
F25213 (May 2006)
MODEL C24EA - ELECTRICAL OPERATION
Front Panel
F25213 (May 2006)
Page 40 of 52
MODEL C24EA - ELECTRICAL OPERATION
Steam Generator and Back Panel
Page 41 of 52
F25213 (May 2006)
MODEL C24EA - ELECTRICAL OPERATION
A.
Internal latching relay (ILR) coil on WLC
board energizes.
Refer to the correct wiring diagram for model being
serviced when reviewing sequence of operation.
B.
High level (HL) coil de-energized by ILR-2
contacts opening.
NOTE: If power switch is set to off when service
voltage is applied, steamer will enter the timed drain
cycle.
C.
Slow fill solenoid de-energized by opening
of HL contacts on WLC board.
SEQUENCE OF OPERATION
Basic Model
1.
Conditions
A.
120VAC present across X1 & X2 on
secondary side of main transformer.
B.
Steamer connected to water supply with
correct water requirements.
C.
Power switch is off (drain handle pulled
out).
1)
9.
Time delay relay timed out. Timer has
no output on terminal 1.
D.
Condensate thermostat is open.
E.
High limit thermostat closed.
F.
Pressure switch is closed.
G.
Hold thermostat open.
H.
Drain open and steam generator tank
(referred to as tank) is empty.
I.
Timer is off.
K.
Water level control (WLC) and tank
properly grounded.
B.
Temperature in tank is maintained at
195E F by hold thermostat control of
regulating contactor through relay contacts
K1-1/5.
Amber power light illuminates.
C.
X1 potential to L1 of WLC board.
Timer motor energized through closure of
N.O. contacts K1-6/4 when time set is
greater than zero. Door switch closure
allows 120VAC across timer wires 18 & 19.
Timer counts down from set time.
B.
Tank temperature maintained by control of
regulating contactor coil through N.O.
contacts K1-6/4 and (Timer -1/3, door
switch, K1-5/3).
A.
Regulating contactor remains energized as
long as time remains on Timer and door is
closed.
Heating element energized
continuously.
Condensate thermostat closes energizing
cooling solenoid 1SOL. Condensate is
cooled in drain box before entering facility
drain system.
12. Door opened during timed cook cycle.
1)
120VAC across L1 & L2 of WLC
board.
2)
High level coil (HL) energized on WLC
board. HL LED on WLC board lights.
3.
Slow fill solenoid energized through closure of
HL contacts. Tank fills.
4.
Water level reaches Low Level Cut-Off (LLCO)
probe.
A.
LLCO coil is energized. LLCO LED on
WLC board lights.
B.
LLCO N.O. contacts close enabling heating
element circuit.
A.
Timer continues count down until time
equals zero even if steamer door is
opened.
B.
Regulating contactor de-energized until
below 195EF.
13. Time reaches zero.
A.
Buzzer is energized through N.O. contacts
K1-6/4 and Timer - 1/4.
1)
5.
Limiting and regulating contactor coils energize.
Power to heating element. Tank water heats.
6.
Water level reaches Low level (L) probe.
Buzzer remains energized until timer
knob is turned to OFF, new time is set
or drain handle is pulled out (power
switch off).
14. Drain handle pulled out. Tank drains.
No action as internal latching relay (ILR-1)
contacts are open.
Water level reaches high level (H) probe.
F25213 (May 2006)
A.
11. Temperature of condensate exiting cooking
cavity increases to above 135EF.
N.O. contacts close.
B.
Timer knob set to time other than zero.
1)
Manual linkage closes drain valve and
operates power switch.
1)
7.
Relay K1 energizes. Timer circuit is
enabled through closure of N.O. contacts
K1-5/3 and K1-6/4.
A.
ON/OFF lever pushed in.
A.
A.
10. Steamer door is closed.
Steamer door open.
J.
A.
Tank water reaches 195E F. Hold thermostat
contacts close.
Steamer connected to correct voltage.
1)
2.
8.
Page 42 of 52
A.
Power light (1LT-Amber) turns off.
MODEL C24EA - ELECTRICAL OPERATION
B.
C.
Time delay relay is energized through
terminals 2 & 3 for set time (90 seconds).
Output (120VAC) on terminal 1.
E.
Time delay relay output energizes K3 coil.
1)
X1 potential to L1 of WLC board
through N.O. contacts K3-5/3
2)
LLCO relay K2 coil energized through
closed N.O. contacts K3-5/3, WLC
board N.O. contacts LLCO and N.O.
contacts K3-6/4.
a.
3)
Drain Flush Solenoid enabled by
closure of N.O. contacts K2-3/5.
2.
Heating element and timer control
circuits are disabled by opening of
N.C. contacts K3-6/2.
15. Condensate Thermostat reaches 135E F cut-in
temperature, contacts close. Drain water
temperature is regulated through condensate
thermostat.
A.
A.
Pressure switch is closed.
G.
Hold thermostat open.
H.
Drain closed and steam generator tank
(referred to as tank) is empty.
I.
Steamer door open.
J.
Timer is off.
K.
Water level control (WLC) and tank
properly grounded.
Power switch (1S) is turned on.
A.
Power light (3LT - Amber) illuminates.
B.
X1 potential to L1 of WLC board.
C.
3.
Internal latching relay (ILR) de-energizes.
1)
High level coil (HL) energized on WLC
board. HL LED on WLC board lights.
17. Tank water level drops below LLCO probe.
A.
F.
Cooling Solenoid and Drain Flush Solenoid
energized through cycling of Condensate
Thermostat.
16. Tank water level drops below L probe.
LLCO relay K2 de-energized through
opening of WLC board LLCO N.O.
contacts.
1)
Drain Flush Solenoid energized
through N.C. contacts (K2-6/2).
2)
Flush/Fast Fill Solenoid energized
through N.C. contacts K2-6/2 and K25/1.
3)
120VAC across L1 & L2 of WLC
board.
2)
High level coil (HL) energized on WLC
board. HL LED on WLC board lights.
Fast Fill Solenoid (3SOL) energized
through N.C. contacts K3-1/5, N.C.
contacts WLC (LLCO) and N.C. contacts
K2-5/1. Tank begins to fill with water.
A.
LLCO coil is energized. LLCO LED on
WLC board lights.
B.
LLCO N.C. contacts open de-energizing
Fast Fill Solenoid.
C.
LLCO N.O. contacts close enabling timer
and heating element circuits.
4.
Limiting contactor coil energizes.
5.
Regulating contactor coil energizes through
N.C. contacts K1-1/5. Power to heating
element. Tank water heats.
6.
Tank water reaches 195E F. Hold thermostat
contacts close.
Vacuum Relief Solenoid is energized
through closed N.O. contacts K2-2/6.
Power (120VAC) removed from output of
Time Delay Relay terminal 1.
1)
1)
Water level reaches Low Level Cut-Off (LLCO)
probe.
A.
Slow Fill Solenoid is energized through
closure of Cycling Thermostat (3TAS) and
closed WLC (HL) N.O. contacts. Tank
continues to fill.
B.
Relay K1 energizes. Timer circuit is
enabled through closure of N.O. contacts
K1-6/4 and K1-5/3.
18. Time Delay Relay time elapses.
A.
High limit thermostat closed.
All solenoids, coils and WLC board
are de-energized.
Professional Model
1)
1.
2)
Conditions
A.
Steamer connected to correct voltage.
1)
120VAC potential across X1 & X2 on
secondary side of main transformer.
B.
Steamer connected to water supply with
correct water requirements.
C.
Power switch is in off position.
1)
D.
C.
Time delay relay timed out. Timer has
no output on terminal 1.
Condensate thermostat is open.
7.
Page 43 of 52
Ready light (1LT - Green) illuminates.
Relay K4 energizes.
a.
Super Heater energizes through
closure of N.O. contacts K4-6/4.
b.
Ready light (1LT - green) lights.
c.
Latch circuit is completed by
closure of N.O. contacts K4-5/3.
Temperature in tank is maintained at
195E F by Cycling Thermostat control of
regulating contactor through N.C. contacts
K1-1/5.
Water level reaches Low level (L) probe.
F25213 (May 2006)
MODEL C24EA - ELECTRICAL OPERATION
A.
8.
9.
No action as internal latching relay (ILR-1)
contacts are open.
C.
Water level reaches high level(H) probe.
A.
Internal latching relay (ILR) coil on WLC
board energizes.
B.
High level (HL) coil de-energized by ILR-2
contacts opening.
C.
Slow Fill Solenoid de-energized by opening
of HL contacts on WLC board.
D.
HL LED on WLC board turns off.
D.
Timer knob set to CONSTANT for continuous
steam operation or Timer knob is turned to a
timed setting.
A.
Power (120VAC) present to Door Switch
wire #19.
B.
If Timer is set to a timed setting, Timer
motor is energized through closure of N.O.
contacts K1-6/4. Count down time begins.
Door Switch (2S) contacts close. Cook light
(2LT - Red) illuminates.
B.
Regulating contactor remains energized as
long as door is closed and Timer is set to
CONSTANT or time remains on timed
cycle.
11. Temperature of condensate exiting cooking
cavity increases to above 135EF.
A.
Condensate thermostat closes energizing
cooling solenoid 1SOL. Condensate is
cooled in drain box before entering facility
drain system.
1)
X1 potential to L1 of WLC board
through N.O. contacts K3-3/5.
2)
Relay K2 coil energized through WLC
N.O. contacts LLCO and N.O.
contacts K3-6/4.
3)
Heating element and timer control
circuits are disabled by opening of
N.C. contacts K3-6/2.
Power (120VAC) across primary of drain
transformer. Motorized drain valve
energized. Drain valve opens and tank
begins to drain.
1)
Drain valve N.O. contacts close.
15. Condensate Thermostat reaches 135EF,
contacts close. Drain water temperature is
regulated through condensate thermostat.
A.
Cooling Solenoid (1SOL) energized
through closure of Condensate Thermostat
contacts.
B.
Flush Solenoid (2SOL) energized through
closure of N.O. contacts K2-3/5 and drain
valve N.O. contacts.
10. Steamer door is closed.
A.
Time delay relay output energizes K3 coil.
16. Tank water level drops below L probe.
A.
Internal latching relay (ILR) de-energizes.
1)
High level coil (HL) energized on WLC
board. HL LED on WLC board lights.
17. Tank water level drops below LLCO probe.
12. Door opened during timed cook cycle.
A.
Relay K2 de-energized through opening of
WLC board LLCO N.O. contacts.
B.
Vacuum Relief Solenoid energized through
N.C. contacts K2-2/6.
A.
Timer continues count down until time
equals zero even if steamer door is
opened.
C.
Fast Fill Solenoid energized through WLC
(LLCO) N.C. contacts and N.C. contacts
K2-5/1.
B.
Regulating contactor de-energizes and
cook light turns off.
D.
Flush Solenoid (2SOL) remains energized
through WLC (LLCO) N.C. contacts.
13. Time reaches zero.
A.
18. Time Delay Relay time elapses.
Buzzer is energized through N.O. contacts
K1-6/4 and Timer - 11/14.
1)
Buzzer remains energized until timer
knob is turned to OFF, new time or
CONSTANT is selected or steamer is
turned off.
14. Power Switch (1S) pushed to off.
A.
Power (3LT), Cook (2LT) and Ready (1LT)
lights turn off.
B.
Time delay relay is energized through
terminals 2 & 3. Output (120VAC) on
terminal 1 for 90 seconds.
F25213 (May 2006)
Page 44 of 52
A.
Power (120VAC) removed from output of
Time Delay Relay terminal 1.
1)
All Solenoids, coils and WLC board
are de-energized.
2)
Motorized drain valve de-energized.
Drain valve closes.
MODEL C24EA - ELECTRICAL OPERATION
WIRING DIAGRAMS
Heating Element Wiring
Page 45 of 52
F25213 (May 2006)
MODEL C24EA - ELECTRICAL OPERATION
F25213 (May 2006)
Page 46 of 52
MODEL C24EA - ELECTRICAL OPERATION
Page 47 of 52
F25213 (May 2006)
MODEL C24EA - ELECTRICAL OPERATION
F25213 (May 2006)
Page 48 of 52
MODEL C24EA - ELECTRICAL OPERATION
Page 49 of 52
F25213 (May 2006)
MODEL C24EA - TROUBLESHOOTING
TROUBLESHOOTING
SYMPTOM
Compartment leaks water around door.
Steamer leaks water.
POSSIBLE CAUSES
Unit not level.
Drain line obstructed or not to an open gap drain.
Door gasket damaged.
Solenoid (2SOL) inoperative or plugged.
Lack of water supply.
Drain water thermostat stuck open.
Drain cold water condensate valve malfunction.
Worn gasket - See DOOR section.
Damaged gasket.
Drain line obstructed or not to an open drain.
Cycling thermostat (2TAS) or related heat control circuitry
malfunction.
2. Relay K1 malfunction.
1. Tank gasket not sealing.
2. Loose steam line.
1. Dirty low level cut-off probe (shorted to ground).
2. Contactor malfunction.
3. WLC- LLCO contacts stuck closed. Water level controller
(WLC) malfunction.
1. Check incoming voltage.
2. Tank not filled.
3. Power switch malfunction.
4. Water Level Control malfunction.
5. Relay (K1) malfunction.
6. High-limit thermostat open (2TAS).
7. Heating element inoperative.
8. Limiting or regulating contactor malfunction.
9. Control thermostat open (2TAS).
10. Relay (K3) malfunction.
11. Water too pure for probes to properly conduct electricity.
1. Loose connections in water, steam or drain lines.
Tank water level too high.
1.
Cold water condenser not operating
properly.
Steam leaks around door.
Steam generated inside cooking
compartment when timer is off.
Steam leaking inside panels.
Heat coming on without water in tank.
Machine will not heat.
Tank does not fill.
Timer motor does not run
Water running out of drain during fill.
Door not closing properly.
Door won’t open.
Buzzer not operating.
F25213 (May 2006)
1.
2.
3.
1.
2.
3.
4.
1.
2.
3.
1.
2.
3.
1.
2.
3.
4.
1.
2.
1.
2.
3.
4.
1.
2.
1.
1.
2.
Slow fill solenoid (4SOL) or fast fill solenoid (3SOL) does not
shut off.
High level probe malfunction (open circuit).
Water level control board inoperative (WLC).
Water supply not on.
Slow fill solenoid (4SOL) or fast fill solenoid (3SOL) not being
energized or plugged.
Water level control board malfunction (WLC).
Water level probes shorted to ground.
Relay K1-6/4 contacts not closing.
Timer malfunction.
Manual drain open (Basic only).
Motorized drain valve stuck open (Professional only).
Time delay relay malfunction.
Condensate thermostat malfunction.
Door latch assembly.
Striker adjustment.
Latch won’t release. Refer to DOOR LATCH ADJUSTMENT
as outlined in DOOR.
Timer malfunction.
Buzzer malfunction.
Page 50 of 52
MODEL C24EA - TROUBLESHOOTING
-NOTES-
Page 51 of 52
F25213 (May 2006)
MODEL C24EA - CONDENSED SPARE PARTS LIST
CONDENSED SPARE PARTS LIST
C24EA
PART NO.
844069-1
856658-1
294500-33
410472-8
411500-12
416535-6
855661-1
881654
FE-024-94
294436-3
856621-1
856773-1
411499-4
856718-1
FP-090-57
857022-1
850736-2
856716-1
856720-2
856720-4
856720-6
856756-1
856710-1
856710-2
856709-1
856711-1
842049-1
855677-1
857021-1
855286-1
855286-2
DESCRIPTION
Water Level Control Board (WLC)
Cavity Vacuum Breaker
Transformer
Terminal Block - Main
Transformer (2T)
Relay
Time Delay Relay
Contactor
Fuse, 250V, 4A (slow blow)
Fuse Block
Timer
Timer Knob
Buzzer
Drain Valve Assembly, Motorized
Drain Valve, Manual
Pressure Switch
Water Level Probe Assembly
Temperature Probe Hold Thermostat
Dual Water Valve, Fill (3 & 5 pan)
Dual Water Valve, Condensate (3 pan)
Dual Water Valve, Condensate (5 pan)
High-Limit Thermostat
Heating Element Assy 208/240, 15 kW (5 pan)
Heating Element Assy 208/240, 8.5 kW (3 pan)
Heating Element - Super Heater 208/240V
Generator Tank Gasket
Switch, Door (also power switch for Basic steamer)
Switch, Power (Professional only)
Solenoid, Vacuum Relief
Gasket, Door (3 pan)
Gasket, Door (5 pan)
F25213 (May 2006)
Basic
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Professional
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Qty.
1
1
1
1
1
3
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
Printed in U.S.A.
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