SERVICE MANUAL
C24EA SERIES
ATMOSPHERIC
STEAMERS
C24EA3 208/240V PRO
C24EA3 480V PRO
C24EA5 208/240V PRO
C24EA5 480V PRO
C24EA3 208/240V BASIC
C24EA3 480V BASIC
C24EA5 208/240V BASIC
C24EA5 480V BASIC
ML-136037
C24EA3 BASIC SHOWN
ML-136044
ML-136038
ML-136047
ML-136043
ML-136045
ML-136046
ML-136048
- NOTICE -
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified. If you have attended a Vulcan Service School for this
product, you may be qualified to perform all the procedures
described in this manual.
This manual is not intended to be all encompassing. If you have
not attended a Vulcan Service School for this product, you should
read, in its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
required to perform the procedure. Procedures for which you do
not have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
Reproduction or other use of this Manual, without the express
written consent of Vulcan, is prohibited.
For additional information on Vulcan-Hart Company or to locate an authorized
A product of VULCAN-HART
LOUISVILLE, KY 40201-0696
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MODEL C24EA - GENERAL
GENERAL
INTRODUCTION
This manual is applicable to the models and ML numbers listed on the cover page. Procedures apply to all models
unless specified otherwise.
Steam Cooking
Atmospheric steamers offer an efficient way to produce many foods in either small portions or larger batches.
Atmospheric convection steam cooking will steam cook fresh foods or will steam defrost and cook frozen foods
providing the maximum color, flavor and nutritional value with the least expenditure of energy and labor. The
atmospheric steaming compartment allows the operator to open and close the door anytime during a cooking
cycle. The generator element will shut off when the door is opened then re-start when the door is closed.
MODELS COVERED
Model Designations (based on 2.5 inch pan depth)
C24EA3 Three pan - Basic or Professional
C24EA5 Five pan - Basic or Professional
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MODEL C24EA - GENERAL
SPECIFICATIONS
NOTE: All C24EA steamers, with exception of 480V steamers, are shipped pre-wired for 208/60/3 operation.
Steamer heating element wiring connection change is required if connecting to 208/60/1, 240/60/1 or 240/60/3
electrical service.
ELECTRICAL SPECIFICATIONS
AMPERAGE
3 PHASE
240V
1 PHASE
TOTAL
kW
MODEL
Hz.
208V
L2
480V
L2
208V 240V
L1
L3
L1
L2
L3
L1
L3
C24EA3 - Basic
C24EA5 - Basic
C24EA3 - Pro
C24EA5 - Pro
8.5
50/60 26.5 26.5 17.7 20.5 20.5 20.5 10.3 10.3 10.3 40.9 35.4
50/60 46.8 46.8 31.2 36.1 36.1 36.1 18.0 18.0 18.0 72.1 62.5
50/60 26.5 28.9 20.0 20.5 23.2 23.2 10.2 11.6 11.6 43.6 38.5
15.0
9.25
15.75 50/60 46.8 49.2 33.6 36.1 38.8 38.8 18.0 19.4 19.4 74.8 65.6
WATER SUPPLY REQUIREMENTS
!
!
!
!
!
!
!
!
Supply pressure should be ........................ 20-60 psig
In line strainer for supply line (Supplied)
Total dissolved solids (TDS)* .................... less than 60 ppm
Total alkalinity ........................................... less than 20 ppm
Silica ......................................................... less than 13 ppm
Chloride .................................................... less than 4.0 ppm
PH factor ................................................... 6.5 to 8
Undissolved Solids..................................... less than 5 microns
*17.1 ppm = 1 grain of hardness
Water hardness below 4 grains/gal requires water treatment to reduce
potential corrosion. Hardness above 6 grains/gal should be treated by
water conditioner, water softener or in-line treatment.
Water Conditioning
It is recommended that a local water treatment specialist be consulted before the installation of any steam
generating equipment.
Furnishing the steam generator with properly conditioned water to reduce scale formation is important. Scale
formation will reduce steam output, cause premature component failure and shorten equipment life. Most water
supplies contain scale producing minerals such as calcium and magnesium. As steam is generated, the minerals
remain and dissolve into the remaining water. As the concentration of these minerals increases past a certain
point, they precipitate from the water and coat the inside of the tank, heating elements, thermostat bulbs and water
level probes. Because of the high temperature of these surfaces, the precipitated minerals bake onto them and
become very difficult to remove.
This phenomenon causes several problems:
1. Reduces the heat transfer efficiency of the heaters.
2. Causes premature failure of the heaters.
3. Water level probes will give false readings.
4. Thermostat bulbs will sense temperature incorrectly.
These problems are common to any manufacturer's steamer regardless of design, but they can all be prevented
by furnishing the steam generator tank with properly conditioned water. Vulcan recommends the water contain
less than 60ppm of total dissolved solids (TDS) and have a PH factor between 6.5 to 8.
F25213 (May 2006)
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MODEL C24EA - GENERAL
Other chemical properties in water supplies can also affect good steam generation and vary from within each state
and locality.
The water level probes in the steam generator tank use ions in the water to detect the water level. Do not use fully
demineralized or de-ionized water since it is non-conductive and the water level can not be detected.
NOTE: The use of strainers, or filters will not remove minerals from the water.
Steamers that operate over a long period of time without the benefit of properly conditioned water, which have
developed a heavy scale build up, should be cleaned before connecting to a conditioned water supply.
•
Pressure Gauge Assembly
REFERENCE MATERIAL
•
•
•
•
Low Pressure Gauge - 0 to 5 psi.
recommended (Grainger Part No. 2C641).
For replacement parts, refer to Catalog of
Replacement Parts F-43123.
Water Hose Coupling - swivel type
(Grainger Part No. 4KG87).
For operation, care and cleaning instructions, refer to
Installation and Operation Manual F-35428.
Reducer Bushing (Grainger Part No.
6MN61).
LUBRICATION
Pipe thread sealant (as required).
Component
Lubrication Type
Heating Element
Screws
Never Seez
All NPT Fittings
Pipe Thread Sealant, Loctite
565
Door Handle
Lubriplate 630AA
Sliding Bracket
TOOLS
•
•
Standard set of hand tools.
VOM with A/C current tester (any quality VOM
with a sensitivity of at least 20K ohms per volt
can be used).
•
Anti Static Kit, part no. TL - 84919.
Special
•
Torque Wrench - Capable of measuring
70 in*lb.
•
Aluminum Foil Tape - (McMaster-Carr Part No.
7631A21) or equivalent.
Page 5 of 52
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MODEL C24EA - COVERS AND PANELS
COVERS AND PANELS
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
RIGHT AND LEFT SIDE PANELS
TOP COVER
1. Remove RIGHT AND LEFT SIDE PANELS.
NOTE: Removal of left side panel is identical to the
procedure for the right side panel.
2. Remove the screws securing top cover to rear
panel.
1. Remove screws from the bottom of panel being
removed.
3. Remove the screws securing top cover to front
panel. Screws are located on either side of the
cooking cavity.
2. Pull bottom of panel out and slide down to clear
top cover.
4. Disconnect the delime hose from delime port
fitting.
3. Reverse procedure to install.
RIGHT SIDE SHOWN
5. Lift top cover off machine.
6. Reassemble parts removed in reverse order.
7. Check machine for proper operation.
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MODEL C24EA - COVERS AND PANELS
REAR PANEL
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
1. Remove screws securing top cover to rear
panel and rear panel to steamer frame.
SCREW LOCATION
NOTE: If incoming plumbing or drain interferes with
rear panel removal, turn off water supply and
disconnect plumbing to machine.
2. Remove LEFT SIDE PANEL.
3. Disconnect vacuum relief hose from fitting.
TOP COVER REMOVED FOR CLARITY
4. Pull bottom of rear panel away from machine
and plumbing.
5. Reassemble parts removed in reverse order.
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MODEL C24EA - DOOR
DOOR
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL
GASKET
1. Close door.
1. Open door.
2. Remove LEFT SIDE PANEL as outlined in
COVERS AND PANELS.
2. Remove the shoulder screws and pan pusher
bracket from gasket plate.
3. Remove nuts from upper hinge located inside
front panel.
3. Remove gasket plate.
4. Open door slightly, and while holding door, pull
upper hinge away from front panel.
4. Remove gasket from inner door panel.
5. Remove RTV from bottom part of inner door
panel. Apply new RTV 109 to bottom of door
where shown when assembling gasket to door.
5. Pull upper hinge out of upper door hinge
bushing.
6. Lift door assembly up and off lower door hinge.
7. Reinstall parts removed in reverse order of
removal.
8. Check door for fit and proper sealing of gasket.
6. Place a small amount of RTV109 into the inner
door panel gasket screw holes before
assembly.
7. Position the new gasket on gasket plate and
reverse procedure to install.
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MODEL C24EA - DOOR
Installation
DOOR HANDLE
1. Apply Lubriplate 630AA around slots of outer
door housing where step spacers contact
housing.
Removal
1. Open door.
2. Install door handle into outer door housing such
that hinge side of door housing is to the left and
arrow on handle is pointed upward.
2. Remove screws from top and bottom of door
assembly.
3. Install step spacer with smaller radius toward
handle and door housing. Smaller radius is a
slip fit with outer door housing slot.
3. Pull outer door housing away from inner door
panel starting at the hinge side of door to
separate the door halves.
4. Install lock nuts and tighten until no gap exists
between handle, step spacer and lock nut. Do
not over-tighten lock nuts.
NOTE: The smaller radius of the step spacers fit into
the slots of the outer door housing and is used to
provide clearance for handle operation.
5. Close inner door panel so that latch mechanism
engages striker on front panel.
4. Remove lock nuts and stepped spacers from
threaded studs of door handle.
6. Install outer door housing onto inner door panel.
7. Align the top and bottom screw holes of outer
door housing with inner door panel.
8. Apply Loctite 242 to threads of screws before
assembling.
9. Install screws to secure door halves together.
10. Check opening and closing operation of door.
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MODEL C24EA - DOOR
Assembly
LATCH ASSEMBLY
1. Apply Lubriplate 630AA to sides of sliding
Removal and Disassembly
bracket.
1. Separate outer door housing assembly from
inner door panel as outlined under DOOR
HANDLE.
2. Insert spring pin into bottom of sliding bracket.
A. Place spring over spring pin.
3. Assemble sliding bracket into stationary
bracket.
2. Remove screws securing latch assembly to
inner door panel and remove latch mechanism.
4. While holding head of spring pin against bottom
of sliding bracket, insert spring pin into keeper
hole in bottom of stationary bracket.
3. Remove E-clip from latch assembly pins and
pull pins from latch mechanism.
A. Secure spring pin in place with retaining
pin.
NOTE: Install pins such that heads of pins will be
facing inward toward hinge side of inner door panel
when latch assembly is installed.
5. Install pins to assemble stationary and sliding
brackets together.
A. Secure pins into position with E-clip.
Installation
1. Install latch assembly onto inner door panel with
spring pin toward bottom of door panel.
A. Apply Loctite 271 to threads of screws
before assembly and secure latch
assembly to inner door panel.
4. Remove retaining pin from spring pin.
5. Separate sliding bracket from stationary
bracket.
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MODEL C24EA - DOOR
2. Install outer door housing assembly as outlined
A. Press hinge bearing fully into door
assembly using a C-clamp or equivalent.
in DOOR HANDLE.
3. Check opening and closing operation of door.
10. Reassemble parts removed in reverse order.
4. Check steamer for proper operation and leaks
around door seal.
11. Check door for fit and proper door gasket
sealing.
HINGE BEARINGS
DOOR LATCH ADJUSTMENT
Opening a Jammed Door
1. Close door.
CAUTION: Should the steamer door jam and
cannot be opened, DO NOT FORCE OR PRY the
door as damage will occur.
2. Remove LEFT SIDE PANEL as outlined in
COVERS AND PANELS.
3. Remove nuts from upper hinge located inside
front panel.
1. Lift up on bottom of door at the handle end to
disengage latch.
A. If door does not open, remove the right
side panel as outlined in RIGHT AND
LEFT SIDE PANELS.
B. Locate the striker that catches on door
latch near steam chamber on front panel.
4. Open door slightly, and while holding door, pull
upper hinge away from front panel.
5. Pull upper hinge out of upper door hinge
bearing.
6. Lift door assembly up and off lower door hinge.
7. Pry hinge bearing out from door assembly.
8. Remove outer door housing.
C. Remove the nut from striker and this
should release it from the panel.
CAUTION: Do not drive bearing into place. The
inner door panel could be damaged. Press
bearing into position.
NOTE: When replacing door hinge bearings, replace
both hinge bearings.
9. Position replacement hinge bearing over hinge
opening in door assembly.
D. Open door.
2. Remove striker.
3. Remove any burrs on striker that may cause
latch to stick.
4. Apply Loctite 271 to threads of striker.
5. Reinstall striker with slotted side up. Snug
striker nut. Perform Adjustment, so door will not
jam.
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MODEL C24EA - DRAIN BOX
4. Once proper slot alignment has been set, hold
Adjustment
striker close to its base then tighten the striker
nut. Be careful not to damage striker slot when
tightening or door may not latch properly.
1. Reinstall striker with slot pointing upward and
hand tighten nut only.
2. Close door to center striker in front panel
mounting hole.
NOTE: Do not over-tighten nut. If over-tightened,
striker may turn and change alignment.
3. Open door and check striker slot for horizontal
alignment. The slot on striker must be kept
horizontal in order for door latch to catch
properly and latch.
NOTE: If door does not open easily, add shims
between striker and cabinet front. When adding
shims make certain that door gasket seals properly
and steamer does not leak. Remove shims as
necessary until leaking stops.
DRAIN BOX
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
6. Disconnect the steam generator drain hose.
REMOVAL AND REPLACEMENT
1. Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A. Turn off water supply.
2. Disconnect the drain plumbing from drain box
outlet fitting.
3. Remove the RIGHT AND LEFT SIDE PANELS
as outlined in COVERS AND PANELS.
NOTE: Use plumbing sealant when reinstalling
condensate thermostat.
4. Disconnect the condensate thermostat electrical
wiring.
A. Remove the condensate thermostat from
drain box.
CLOSE-UP FROM RIGHT SIDE OF STEAMER
5. Disconnect the cooling solenoid and cooking
compartment drain hoses.
7. Remove the nuts securing drain box to back
plate at rear of steamer.
8. Remove drain box from steamer.
NOTE: The steam generator drain hose is accessed
from right side of machine.
9. Reassemble parts removed in reverse order.
10. Check steamer for proper operation and leaks
around condensate thermostat and hose
connection points.
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MODEL C24EA - COOKING COMPARTMENT
COOKING COMPARTMENT
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL AND REPLACEMENT
NOTE: The cooking compartment and front panel
are constructed as an assembly and cannot be
separated.
1. Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A. Turn off water supply.
2. Remove the RIGHT AND LEFT SIDE PANELS
and TOP COVER as outlined in COVERS AND
PANELS.
3. Remove the DOOR as outlined in HINGE
7. Disconnect the drain hose from rear of cooking
BUSHING.
compartment.
A. Remove both hinges.
4. Remove the timer, indicator light, on/off switch
(Professional models only), striker and door
switch assembly.
NOTE: Screws are located on either side of cooking
compartment securing front panel to lower louvered
panel.
PROFESSIONAL MODEL SHOWN
5. Remove the vacuum breaker and hose as an
assembly.
6. Disconnect steam inlet hose from the steam
inlet port.
A. Remove the steam inlet port.
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MODEL C24EA - COOKING COMPARTMENT
8. Remove the screws securing front panel to
lower louvered panel.
9. Remove the nuts securing rear of cooking
compartment to the vertical mounting brackets
(four places - located between cooking
compartment and steam generator).
10. Remove cooking compartment assembly.
11. If removed or replacing cooking compartment,
install insulation around cooking compartment.
Secure insulation into position using high
temperature aluminum foil tape.
12. Reinstall parts removed in reverse order.
13. Check DOOR LATCH ADJUSTMENT.
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MODEL C24EA - THERMOSTATS
THERMOSTATS
2. Remove RIGHT SIDE PANEL and TOP
HOLD THERMOSTAT
COVER as outlined under COVERS AND
PANELS.
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
3. Remove HEATING ELEMENT.
4. Loosen hose clamp securing capillary bulb to
top of heating element.
5. Fully loosen the small capillary tube
compression nut and slide it away from heating
element.
1. Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
6. Remove large capillary nut from heater base
plate and slide it away from heating element.
A. Turn off water supply.
2. Remove RIGHT SIDE PANEL as outlined under
COVERS AND PANELS.
3. Disconnect electrical lead wires from hold
thermostat.
4. Remove hold thermostat from steam generator
tank.
7. Remove capillary tube from heating element.
8. Disconnect electrical wiring to high-limit
thermostat.
9. Remove high-limit thermostat from mounting
bracket.
NOTE: Apply Loctite 565 to threads of hold
thermostat before assembly.
5. Reassemble parts removed in reverse order of
removal.
6. Check steamer for proper operation and leaks
around hold thermostat.
HIGH-LIMIT THERMOSTAT
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
Removal
1. Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
A. Turn off water supply.
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MODEL C24EA - THERMOSTATS
Installation
CONDENSATE THERMOSTAT
1. Insert capillary bulb through large compression
nut.
WARNING: DISCONNECT THE
ELECTRICAL POWER TO THE
MACHINE AND FOLLOW LOCKOUT /
TAGOUT PROCEDURES.
A. Route capillary bulb through top of heating
element.
B. Position capillary bulb between top of
second and third heating element coils.
Secure with hose clamp to second coil as
shown.
1. Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
2. Apply pipe thread sealant to threads of large
capillary nut then install large compression nut.
A. Turn off water supply.
A. Pull excess capillary tubing out of heating
element through large nut. Route capillary
tubing such that there are no sharp bends.
2. Remove LEFT SIDE PANEL as outlined in
COVERS AND PANELS.
3. Disconnect electrical wiring to condensate
thermostat.
B. Tighten the small capillary compression nut
into the large compression nut.
NOTE: Install a new gasket when reassembling
steam generator tank. Temporarily secure gasket in
place with RTV109.
4. Remove condensate thermostat from drain box.
5. Reassemble parts removed in reverse order of
removal. Make certain to apply Loctite 565
thread sealant to threads of thermostat before
assembly.
3. Reinstall remaining parts removed in reverse
order.
4. Torque heating element screws to 70 in*lb
following the heating element tightening
6. Check steamer for proper operation and leaks
around condensate thermostat.
sequence as found under HEATING ELEMENT.
5. Check steamer for proper operation and leaks
around heating element gasket and high-limit
thermostat.
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MODEL C24EA - TIMER
TIMER
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
REMOVAL AND REPLACEMENT
NOTE: The basic and professional model steamers
use the same 60 minute timer. When the timer
reaches zero, an external buzzer will sound and
steam will stop entering the cooking compartment.
The Professional steamer has extra components to
utilize the constant steam setting allowing the
steamer to operate continuously.
1. Remove RIGHT SIDE PANEL as outlined under
COVERS AND PANELS.
2. Note electrical connections then disconnect
wiring to timer.
4. Reverse procedure to install.
5. Check steamer for proper operation.
PROFESSIONAL MODEL SHOWN
3. Pull knob from timer shaft.
A. Remove rotary shaft seal from timer shaft
then remove timer from front panel.
B. Inspect rotary shaft seal. Replace if
damaged, worn or signs of moisture
migration into control area around timer
shaft is evident.
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MODEL C24EA - HEATING ELEMENT
HEATING ELEMENT
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
6. Pull heating element out of steam generator
REMOVAL AND REPLACEMENT
tank.
1. Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
7. Note mounting position of high-limit thermostat
bulb then remove bulb from heating element.
A. Turn off water supply.
A. Remove high-limit capillary tube
compression fitting and remove high-limit
capillary and bulb from heating element.
2. Remove RIGHT SIDE PANEL and TOP
COVER as outlined under COVERS AND
PANELS.
3. Note heating element wire connection points
then disconnect heating element lead wires
from contactors.
NOTE: Install a new gasket when reassembling
steam generator tank. Temporarily secure gasket in
place with RTV109.
BASIC MODEL SHOWN
8. Remove gasket from steam generator tank.
4. Carefully position high-limit thermostat capillary
tube to facilitate heating element removal.
Avoid creating sharp bends or kinks in the
capillary tube.
A. Clean remaining sealant from top lip of
steam generator tank.
NOTE: Refer to HIGH-LIMIT THERMOSTAT for
proper placement of capillary bulb.
5. Remove screws and lock washers securing
heating element to tank.
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MODEL C24EA - HEATING ELEMENT
9. Reassemble parts removed in reverse order of removal. Tighten heating element screws evenly to 70 in*lbs.
Follow tightening sequence pattern as shown in illustration.
OVERHEAD VIEW OF HEATING ELEMENT
10. Check steamer for proper operation and leaks around heating element.
DIAGNOSTIC CHECKS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS
WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT
PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
1. Check voltage across heating element wires at limiting and regulating contactor terminals.
A. If voltage is correct, check current draw (step 2).
B. If voltage is not correct, check the following:
1) Voltage supply to steamer.
2) Fuses or breaker blown.
3) Power to contactor coils.
4) Contactors not pulling in. (Mechanical)
2. Check current draw (amps) through heating element lead wires using an amp clamp meter.
A. If current is correct, then heating element is ok.
B. If current is not correct, check element resistance (step 3).
3. Remove one lead wire of each heating element from the regulating contactor and check the individual
element resistance using a VOM.
A. If resistance readings are not correct, replace heating element.
CURRENT PER
ELEMENT
RESISTANCE PER ELEMENT
(OHMS)
MODEL
VOLTAGE
TOTAL kW
208 1
240 2
480Y/277 3
8.5
8.5
8.5
15
10.2
11.8
10.2
18.0
20.8
18.1
20.4
20.4
27.1
11.5
11.5
15.3
3 Pan
208
5 Pan
240
480Y/277 3
15
15
1
2
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
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MODEL C24EA - SUPER HEATER
SUPER HEATER
WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW
LOCKOUT / TAGOUT PROCEDURES.
B. Tape insulation around head of heater
REMOVAL AND REPLACEMENT
element using high-temperature aluminum
foil tape.
1. Turn off machine to drain steam generator tank.
Allow steamer to complete drain cycle.
7. Check to make sure insulated piping assembly
is horizontal or element head end of assembly
is slightly elevated.
A. Turn off water supply.
2. Remove RIGHT SIDE PANEL as outlined under
COVERS AND PANELS.
3. Note super heater wiring connection points then
disconnect heating element lead wires from the
relay (K4) and the regulating contactor.
8. Check steamer for proper operation and leaks
around super heater.
4. Peel back insulation from head of heater
element.
9. Reinstall panels and top cover.
5. Remove super heater element from insulated
piping assembly.
NOTE: Top cover removed for clarity. Removal of
top cover is not necessary to service super heater.
6. Reassemble parts removed in reverse order of
removal.
A. Apply pipe thread sealant to threads of
super heater element before assembly.
F25213 (May 2006)
Page 20 of 52
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MODEL C24EA - SUPER HEATER
DIAGNOSTIC CHECKS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS
WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT
PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
1. Check voltage across super heater wires at limiting and regulating contactor terminals.
A. If voltage is correct, check current draw (step 2).
B. If voltage is not correct, check the following:
1) Voltage supply to steamer.
2) Fuses or breaker open.
3) Relay K4.
4) Power to contactor coils.
5) Contactors not pulling in. (Mechanical)
2. Check current draw (amps) through super heater lead wires using an amp clamp meter.
A. If current is correct, then super heater is ok.
B. If current is not correct, check resistance (step 3).
3. Remove one of the super heater lead wires from the regulating contactor and check resistance using a VOM.
A. If resistance is not correct, replace super heater.
VOLTAGE
208/240
480Y/277 1
TOTAL kW
0.75
CURRENT
3.1
RESISTANCE (OHMS)
76.8
0.75
2.7
102.3
1
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)
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