SERVICE MANUAL
ELECTRIC COUNTER TOP
TILTING KETTLES
K6ETT ML-136067
K12ETT ML-136068
K20ETT ML-136069
K12ETT ON STAND
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly qualified.
This manual is not intended to be all encompassing. If you have not
attended a Vulcan Service School for this product, you should read,
in its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
required to perform the procedure. Procedures for which you do not
have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
Reproduction or other use of this Manual, without the express
written consent of Vulcan, is prohibited.
For additional information on Vulcan-Hart or to locate an authorized parts and
service prov ider in your area, visit our website at www.vulcanhart.com.
A product of VULCAN-HART LOUISVILLE, KY 40201-0696
F35496 (August 2009)
ELECTRIC COUNTER TOP TILTING KETTLES
TABLE OF CONTENTS
GENERAL ................................................................................3
Introduction ............................................................................3
Tools.................................................................................3
Specifications ..........................................................................4
REMOVAL AND REPLACEMENT OF PARTS ....................................................5
Covers and Panels .....................................................................5
Electrical Panel Components - Water Level Control, Transformer, Contactors and Temperature Control . . . 5
Bottom Components - Water Level Probe (LLCO), Temperature Sensor and Pressure Switch ...........6
Potentiometer..........................................................................6
Heating Element........................................................................ 7
Kettle Assembly ........................................................................8
Bearings .............................................................................11
Shaft Seal............................................................................ 12
Pivot Stop Pin......................................................................... 13
SERVICE PROCEDURES AND ADJUSTMENTS.................................................14
Temperature Controller Test ............................................................. 14
Potentiometer Test.....................................................................15
Thermocouple Test ..................................................................... 15
Heating Elements......................................................................16
Venting ..............................................................................17
Filling the Reservoir Jacket .............................................................. 17
ELECTRICAL OPERATION.................................................................. 19
Component Function ...................................................................19
Component Location ................................................................... 20
Water Level Control (WLC LLCO) .........................................................22
Sequence of Operation .................................................................. 23
Schematic Diagram ....................................................................24
Wiring Diagrams....................................................................... 25
TROUBLESHOOTING......................................................................27
© VULCAN 2009
F35496 (August 2009)
Page 2 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - GENERAL
GENERAL
INTRODUCTION
General
The procedures in this manual apply to all models
unless otherwise specified. The pictures and
illustrations are of a model K6ETT countertop tilting
kettle unless otherwise noted. All information and
specifications contained in this manual are based on
the latest product information available at the time of
printing.
Countertop Tilting Kettles
The electric countertop tilting kettles are self
contained two thirds jacketed kettles. The lower two
thirds of the kettle bowl is a double wall stainless
steel construction that provides a reservoir for a
solution of heat transfer fluid and distilled water for
improved heating of the kettle contents. The kettles
are used to prepare a variety of liquid or semi-liquid
food products such as soups, stews and sauces.
MODELS COVERED
The 6 and 12 gallon kettles can be mounted to a
counter top or optional stand. The 20 gallon kettle is
a floor model mounted to its own stand.
Electric Countertop Tilting Kettles
K6ETT - 6 gallon
K12ETT - 12 gallon
K20ETT - 20 gallon
CONTROL PANEL
TOOLS
Standard
• Standard set of hand tools.
• Pipe thread sealant.
• VOM with an AC current tester (meter sensitivity
should be at least 20,000 ohms per volt).
• Temperature meter (thermocouple type). Use
for checking kettle temperature.
• 2 gallon container to hold drained reservoir
Special
• Torque wrench (ft-lbs) for tightening heating
• Lubriplate 630-AA Part No. 501687 for
• Loctite® ODC-Free Cleaner & Degreaser
• Loctite® 7471™ Primer N™ Part No. 544434-2.
• Loctite® 242™ Part No. 520228.
Page 3 of 28
jacket fluid.
element mounting bolts.
lubrication of tilt lock pivot stop pin.
(McMaster-Carr Part No. 66415A21) or
equivalent fast drying, no residue cleaner.
F35496 (August 2009)
ELECTRIC COUNTER TOP TILTING KETTLES - GENERAL
SPECIFICATIONS
Reservoir Jacket Fluid
• Water - Use only distilled water for partial re-filling of the jacket (purchase locally).
• Dowfrost heat transfer fluid Part No. 558038 (5 gallon). Use during a complete re-fill of the jacket with new
fluid. Refer to service procedures for volumes.
Electric
The kettle models listed in this manual, with exception of 480V steamers, are shipped pre-wired for 208/60/3
operation. Kettle heating element wiring change is required if connecting to 208/60/1, 240/60/1 or 240/60/3
electrical service.
ELECTRICAL SPECIFICATIONS
K6ETT
Volts Phase
208 1 7.50 36 12 58 12 58
240 1 10.0 42 16 67 16 67
208 3 7.5 22 12 33 12 33
240 3 10.0 26 16 39 16 39
480 3 7.50 9 12 14 12 14
Total
KW
*
Amps
K12ETT K20ETT
Total
KW
Amps
Total
KW
Amps
*K6ETT only - Heating elements on 208/240VAC three phase machines are
not wired as a balanced load.
F35496 (August 2009)
Page 4 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
Control Box Cover
ELECTRICAL PANEL
COMPONENTS - WATER LEVEL
CONTROL, TRANSFORMER,
CONTACTORS AND
TEMPERATURE CONTROL
1. Remove CONTROL BOX COVER.
2. Disconnect lead wires from component being
replaced.
3. Remove screws securing the component to
panel.
4. Reverse procedure to install and check for
proper operation.
Bottom Cover
F35496 (August 2009)Page 5 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
BOTTOM COMPONENTS -
WATER LEVEL PROBE (LLCO),
TEMPERATURE SENSOR AND
PRESSURE SWITCH
1. Open pressure relief valve until reservoir jacket
is completely vented.
2. Remove BOTTOM COVER.
3. Disconnect lead wires from component being
replaced.
4. If removing pressure switch:
A. Disconnect compression fitting from elbow
near the pressure switch.
B. Remove top nut on brass fitting to remove
pressure switch from mounting bracket.
POTENTIOMETER
1. Remove CONTROL BOX COVER.
2. Disconnect potentiometer wire from
temperature control.
3. Pull temperature dial from potentiometer shaft
and remove seal nut.
5. Remove component from bottom of kettle.
6. Reverse procedure to install.
7. Remove air from reservoir jacket as outlined
under VENTING procedure.
8. Check for proper operation.
NOTE: Pressure switch setting is fixed and should
not be adjusted. Clean threads and apply pipe thread
sealant when replacing pressure switch, water level
probe or temperature sensor.
4. Remove potentiometer from control panel.
5. Reverse procedure to install and check for
proper operation.
NOTE: When installing, ensure potentiometer
alignment tab is seated in positioning bracket.
F35496 (August 2009) Page 6 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
HEATING ELEMENT
1. Open pressure relief valve until reservoir jacket
is completely vented.
2. Tilt kettle to expose the heater access cover.
3. Remove three screws where indicated. Loosen
remaining screw and allow cover to rotate out of
way.
6. Reverse procedure to install. Use a new heating
element seal whenever installing heating
element. Torque mounting bolts to 40 ft-lbs and
tighten in an alternating pattern.
7. Remove air from reservoir jacket as outlined
under VENTING.
8. Check for proper operation and leaks around
heating element.
NOTE: On K6ETT only, element lengths are
staggered to fit the contour of the kettle bottom.
Install with the shortest element toward the bottom of
kettle.
4. Note lead wire locations and disconnect wires
from heating element.
5. Remove mounting bolts securing heating
element to kettle.
F35496 (August 2009)Page 7 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
KETTLE ASSEMBLY
Removal
1. Place kettle in full upright position.
2. Support kettle using 2x4 blocks of wood.
8. Remove outer bearing from support shaft.
3. Remove CONTROL BOX COVER.
4. Disconnect thermocouple lead wires from
temperature control and the 4 pin wiring
harness connector.
5. Note lead wire locations and disconnect from
load side of contactors.
6. Remove wire tie securing lead wire bundle to
control box.
7. Remove three set screws on pivot stop collar.
Access third screw thru the slot in top of control
box.
9. On K20ETT only.
A. Remove two bolts securing kettle tilt stop
to base.
B. Remove kettle support cover.
F35496 (August 2009) Page 8 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
11. If re-installing kettle assembly, proceed to
Installation in this section. If installing a
replacement kettle assembly, remove
components as outlined below from old kettle
assembly for re-use.
A. Open pressure relief valve until reservoir
jacket is completely vented.
B. Place kettle on floor with the pressure relief
valve and reservoir jacket fill elbow facing
up.
C. Remove BOTTOM COVER.
D. Remove WATER LEVEL PROBE.
E. Position kettle assembly to drain fluid into
container. Remove 1/2" pipe plug from the
reservoir jacket fill elbow to facilitate
draining.
F. Remove TEMPERATURE SENSOR AND
PRESSURE SWITCH including
condensate coil.
C. Remove kettle support and bearing
housing assembly from support shaft.
G. Remove pressure relief valve assembly
plumbing and reservoir jacket fill elbow.
10. Pull kettle assembly away from control box to
disengage support shaft from inner bearing and
pivot stop collar. Slide kettle onto the 2x4
blocks.
H. Remove HEATING ELEMENT.
I. Install all removed components onto
replacement kettle. Clean threads and
apply sealant before re-installing pipe
fittings.
Installation
NOTE: Bearings and shaft seal are self aligning for
easy installation. Bearings do not require lubrication.
1. Place kettle assembly on 2x4 blocks and align
support shaft to shaft seal. Pull lead wire bundle
thru shaft seal and inner bearing.
A. Pull lead wire bundle thru inner bearing
and pivot stop collar during removal.
NOTE: If support shaft of kettle assembly does
not easily disengage, apply force between
control box housing and kettle assembly to
release pivot stop collar. The support shaft
should slide out of inner bearing easily.
2. Push kettle assembly support shaft thru shaft
seal and inner bearing.
F35496 (August 2009)Page 9 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
3. Square the kettle assembly to control box
housing. Maintain squareness during
adjustments.
4. On K6ETT and K12ETT only.
A. Ensure the pour stop pin on kettle
assembly engages with tilt stop on control
box housing. Approximately 3/16" spacing
should be maintained between the pour
stop pin and control box housing. Adjust
kettle assembly position as necessary.
NOTE: The kettle assembly may drop slightly
after 2x4 blocks are removed and when fully
loaded. The spacing of pour stop pin will
prevent it from rubbing the control box during
tilt.
A. Slide pivot stop collar onto support shaft.
Operate tilt lock then slide collar against
inner bearing. Hold the collar in position
and release tilt lock. Verify pivot stop pin
fully engages with the slot in pivot stop
collar for the tilt lock as shown. Adjust
kettle assembly position as necessary.
NOTE: The pin location shown will lock the
kettle fully upright. When the kettle is tilted, the
pin engages with the slot near the top to lock
the kettle in position.
6. Insert lead wire bundle thru the outer bearing.
Slide bearing onto support shaft and position it
against pivot stop collar. Install bolts and tighten
to secure the bearing.
7. Apply Lubriplate 630-AA to mating surfaces on
5. Insert lead wire bundle thru pivot stop collar.
Position pivot stop collar as shown in the picture
below. Set screws should remain out of collar.
F35496 (August 2009) Page 10 of 28
8. Clean threads (screw & hole) with cleaner &
pivot stop pin. Ensure pivot stop pin fully
engages with the slot in pivot stop collar and
does not catch or bind when tilt lock is operated.
degreaser. Apply Loctite 7471 Primer N and
Threadlocker 242 to set screws and threaded
holes on pivot stop collar.
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
NOTE: Allow cleaner to fully evaporate before
applying primer. Spay primer on the threads and
allow to dry for 60 seconds. Shake Loctite 242 bottle
thoroughly to mix then apply several drops of the
threadlocker to threads. Do not allow the tip of bottle
to touch a primed surface as it will activate the
Loctite 242 in the bottle.
9. Install set screws on pivot stop collar. Hold the
collar against inner bearing and tighten set
screws to secure.
10. On K20ETT only.
A. Install kettle support to shaft and base.
B. Install kettle support cover and tilt stop to
base.
11. Remove 2x4 blocks from underneath kettle
assembly.
A. With kettle in full vertical position, verify tilt
lock operation. The pivot stop pin should
engage with the slot in pivot stop collar and
not catch or bind when operated.
B. Tilt kettle to horizontal position and verify
pivot stop pin engages with the next slot in
pivot stop collar.
C. Return kettle to full vertical position. Verify
the kettle pour stop pin engages properly
to prevent backwards tilt.
BEARINGS
1. Remove KETTLE ASSEMBLY (procedure
includes outer bearing removal).
2. Remove inner bearing from control box housing.
3. On K20ETT Only.
A. Remove bearing housing assembly from
kettle support.
D. Tilt kettle and verify pour stop pin does not
rub against control box housing.
12. Connect lead wires to contactors and
temperature control then connect 4 pin wiring
harness.
13. Secure lead wire bundle to control box with wire
tie then install cover.
14. If re-installing kettle assembly, verify the
reservoir jacket is maintaining a vacuum as
outlined under VENTING. If a replacement
kettle assembly was installed, fill the reservoir
jacket as outlined under FILLING THE
RESERVOIR JACKET.
15. Connect power to machine and check for proper
operation.
4. Install replacement bearing.
5. Install KETTLE ASSEMBLY.
F35496 (August 2009)Page 11 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
SHAFT SEAL
All Models
1. To access shaft seal between kettle and control
box housing, remove KETTLE ASSEMBLY.
2. Remove shaft seal from control box housing.
3. Remove kettle support and bearing housing
assembly from support shaft.
3. Clean mounting surface on control box housing
then install replacement shaft seal.
4. Install KETTLE ASSEMBLY.
K20ETT only
1. Support kettle using 2x4 blocks of wood.
2. Remove kettle support cover.
4. Remove shaft seal from kettle support.
5. Clean mounting surface on kettle support then
install replacement shaft seal.
F35496 (August 2009) Page 12 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - REMOVAL AND REPLACEMENT OF PARTS
6. Reverse procedure to complete the installation
and check for proper operation.
K20ETT WITH SHAFT SEAL INSTALLED
PIVOT STOP PIN
1. Remove CONTROL BOX COVER.
2. Remove retaining ring from pivot stop pin.
3. Reverse procedure to install.
NOTE: When installing, apply Lubriplate 630-AA to
mating surfaces on pivot stop pin. Ensure pivot stop
pin fully engages with the slot in pivot stop collar and
does not catch or bind when tilt lock is operated. The
picture below is shown with outer bearing removed
for clarity.
F35496 (August 2009)Page 13 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - SERVICE PROCEDURES AND ADJUSTMENTS
SERVICE PROCEDURES AND ADJUSTMENTS
TEMPERATURE CONTROLLER
TEST
1. Place kettle in full upright position.
2. Set temperature dial to lowest setting. Kettle
must be below 110°F before verifying the
potentiometer output to the controller is good
over the full range of temperature dial travel.
3. Access the temperature controller as outlined in
REMOVAL AND REPLACEMENT OF PARTS.
4. Check all lead wires for secure connections to
the controller terminals. Wiring harness lead
wires must be connected to T1-T2 and T3-T4
for proper input to controller.
5. Re-connect power to the machine.
A. Verify heat light (amber) comes on and
heating element is energized.
B. If heat light does not remain on or flashes
momentarily as temperature setting is
slowly increased, verify condition of
potentiometer as outlined under
POTENTIOMETER TEST.
NOTE: Temperature controller will de-energize
internal relay and turn off the output status LED if the
circuitry detects an open thermocouple. LED will
begin to flash 3 times, pause, then repeat the flash
sequence to indicate the open thermocouple
condition.
C. If heat light and heating element do not
turn on.
1) Verify condition of thermocouple as
outlined under THERMOCOUPLE
TEST.
2) Verify output from terminal T8 on
controller as outlined in the steps
below.
9. Disconnect lead wire from terminal T7 on the
controller.
A. Verify 120VAC between lead wire from T7
and X1 on the output of main transformer.
If correct, re-connect lead wire to terminal
T7 and continue with procedure.
B. If incorrect, check pressure switch (1PS)
and water level controller (WLC LLCO).
10. Verify 120VAC between T8 and X1 on the
output of main transformer. If correct, output
from controller is functioning properly.
A. If incorrect, install a replacement
temperature controller and check for
proper operation.
6. Turn power switch on.
7. Verify temperature controller is receiving
120VAC at terminals T1-T2 and T3-T4 and
machine is properly grounded.
8. Slowly turn temperature dial to the highest
setting and monitor heat light over the full range
of travel.
F35496 (August 2009) Page 14 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - SERVICE PROCEDURES AND ADJUSTMENTS
POTENTIOMETER TEST
1. Remove potentiometer from control panel as
outlined in REMOVAL AND REPLACEMENT
OF PARTS.
2. Turn potentiometer shaft fully counterclockwise
to the lowest setting.
3. Set VOM to measure resistance.
4. Connect meter leads to the white and black lead
wires on potentiometer terminals.
A. Resistance should measure approximately
zero ohms.
THERMOCOUPLE TEST
1. Access the temperature controller as outlined in
REMOVAL AND REPLACEMENT OF PARTS.
2. Remove thermocouple lead wires from
temperature controller.
3. Check the thermocouple for a measurable
resistance (approximately 5 to 10 ohms at room
temperature). If meter reads an overload (OL)
condition (open), or zero ohms (short) replace
the thermocouple and check temperature
controller for proper operation.
5. Slowly turn potentiometer shaft clockwise over
the full range of travel and monitor resistance
change on the meter.
A. Resistance should measure 800 to 1200
ohms with shaft turned fully clockwise.
B. If the resistance value increased smoothly
without sudden drops or spikes and the full
travel resistance value is within tolerance
then potentiometer is functioning properly.
C. If the resistance value did not increase
smoothly but had drops or spikes over the
full travel range then potentiometer is not
functioning properly. Install a replacement
potentiometer and check for proper
operation.
F35496 (August 2009)Page 15 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - SERVICE PROCEDURES AND ADJUSTMENTS
HEATING ELEMENTS
1. Access heating element as outlined in REMOVAL AND REPLACEMENT OF PARTS.
2. Measure voltage at heating element terminals and verify it against the data plate voltage.
A. If voltage is incorrect, find the source of the problem.
3. If voltage is correct, check current draw (amps) through the heating element lead wires. If current draw is
correct then heating element is ok. See table below for proper values.
NOTE: Checking current draw is the preferred method over a resistance check when an amp clamp meter is
available.
A. If current draw is not correct then, replace heating element.
4. Check for proper operation.
MODEL VOLTAGE ELEMENT NO.
KW PER
ELEMENT
CURRENT PER
ELEMENT
RESISTANCE PER
ELEMENT (OHMS)
1 2.2 10.5 19.8
208
1, 2
2 2.6 12.3 17.0
3 2.8 13.3 15.6
K6ETT
240
1 2.9 12.1 19.8
1, 2
2 3.4 14.1 17.0
3 3.7 15.3 15.6
3
480
K12ETT
and
K20ETT
1
Dual voltage elements.
2
Element lengths are staggered to fit the contour of the kettle bottom. Element number 1 is the
208
240
480
1
1
2
- 2.5 9.0 30.7
- 4.0 19.2 10.8
- 5.3 22.2 10.8
- 4.0 14.4 19.2
shortest.
3
480V elements are connected in Wye configuration for 277V across each element.
NOTE: Values in table are nominal. Tolerance is ±10 %.
F35496 (August 2009)
Page 16 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - SERVICE PROCEDURES AND ADJUSTMENTS
VENTING
NOTE: This procedure outlines venting the reservoir
jacket to remove air for proper heat transfer to the
kettle contents.
1. With the kettle at room temperature, verify
pressure gauge is in the vacuum zone and
reading 25 to 30 in. Hg.
A. If vacuum is below minimum listed, air
must be removed from reservoir jacket.
Continue with procedure to vent as
necessary.
2. Place kettle in full upright position.
3. Turn power switch on.
FILLING THE RESERVOIR
JACKET
NOTE: The reservoir water level must be maintained
high enough to submerge the heating element. If low
water light comes on during use, the level may be
below water level probe (LLCO) and must be
replenished before heating can continue. The low
water light will come on when kettle is tilted.
When filling reservoir jacket, use only
distilled water.
Partial Refill
1. Place kettle in full upright position.
2. Turn power switch on. If low water light is on,
continue with procedure.
3. Set temperature dial to lowest setting.
4. Open pressure relief valve until reservoir jacket
is completely vented.
5. Remove 1/2" pipe plug from the reservoir jacket
fill elbow at back of kettle.
A. Insert funnel into the opening and slowly
add water until low water light turns off
(LLCO probe is satisfied).
B. Turn power switch off.
C. Continue adding water to bring fluid to the
proper operating level per the amount
listed in table below.
4. Set temperature dial to highest setting. Allow
kettle to heat until the heat indicator light turns
off.
5. Open pressure relief valve for approximately 10
seconds.
6. Turn power switch off and allow kettle to cool
(room temperature).
7. Verify pressure gauge reading is within the
correct vacuum range.
A. If reading is below minimum listed or will
not maintain proper vacuum, check all
threaded fittings extending from the kettle
couplings (right and rear) for leaks and
tightness.
1) Check pressure relief valve for leaks
from poor valve seating or built up
debris. Manually operate the valve
several times to reseat. Repeat
venting procedure.
2) If pressure relief valve is
malfunctioning, install a replacement
and check for proper operation.
Model
K6ETT 0.5
K12ETT 1.6
K20ETT 2.25
6. Clean pipe plug threads and apply thread
sealant. Install pipe plug and tighten to prevent
leaks.
7. Turn power switch on and verify low water light
is off. If low water light is on, there may be a
problem with the water level control circuit. See
troubleshooting.
8. Remove air from reservoir jacket as outlined
under VENTING.
9. Check kettle for proper operation.
Add Water for Proper
Operating Level (Qt)
F35496 (August 2009)Page 17 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - SERVICE PROCEDURES AND ADJUSTMENTS
Complete Draining and Refill
NOTE: Appearance of fluid will no longer be clear
after usage in kettle.
1. Turn power switch off and set temperature dial
to lowest setting.
2. Open pressure relief valve until reservoir jacket
is completely vented.
3. Remove bottom cover as outlined under
COVERS AND PANELS.
4. Remove water level probe (LLCO) from kettle
as outlined in REMOVAL AND REPLACEMENT
OF PARTS.
5. Place kettle in full upright position and allow
fluid to drain into container. Remove 1/2" pipe
plug from reservoir jacket fill elbow (rear of
kettle) to facilitate draining and provide opening
for re-fill.
NOTE: Clean threads and apply sealant before reinstalling pipe fittings.
6. Tilt kettle and re-install water level probe.
7. To Refill.
A. Place kettle in full upright position.
B. Remove pressure gauge to allow reservoir
jacket to vent during fill procedure.
C. Insert funnel into the reservoir jacket fill
elbow. Slowly fill the jacket according to
the volumes listed in the table below.
RESERVOIR JACKET VOLUME
Model
K6ETT 4.0 3.0 1.0
K12ETT 7.2 5.4 1.8
K20ETT 8.0 6.0 2.0
8. Install pipe plug and pressure gauge. Tighten to
prevent leaks.
9. Turn power switch on and verify low water light
is off. If low water light is on, there may be a
problem with the water level control circuit. See
troubleshooting.
Total Fluid
Volume (Qt)
Water
(Qt)
Heat Transfer
Fluid (Qt)
10. Remove air from reservoir jacket as outlined
under VENTING.
11. Check kettle for proper operation and leaks.
12. Install covers.
F35496 (August 2009)
Page 18 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
ELECTRICAL OPERATION
COMPONENT FUNCTION
Water Level Control (WLC LLCO).......... Low water level control. Monitors condition of the WLC LLCO
water level probe. Protects kettle from a low water condition in
the reservoir jacket and removes power from heating circuit
when kettle is tilted.
Probe, Water Level (LLCO) .............. Low Level Cut-Off (LLCO) probe connected to WLC (LLCO).
Controls power to heating circuit.
Contactor (1CON) Limiting ............... Connects one side of heating element to power. Energized
whenever WLC (LLCO) coil is energized.
Contactor (2CON) Regulating ............. Connects heating element to power. On constantly when
temperature controller is calling for heat.
Element, Heating ....................... Heats reservoir jacket fluid. The heat in the fluid is then
transferred to kettle.
Fuse, (1FU & 2FU)....................... Slow blow 3A fuse. Located on primary side of main transformer
(1T). Protects control circuitry from over-currents.
Switch (1PAS), Pressure ................. Pressure cut-out protection for the reservoir jacket. Range is
between 38 to 42 PSI. Removes power from control circuit if
pressure in the jacket rises above switch setting.
Transformer (1T), Main .................. Step down transformer from line voltage to 120VAC control
circuit voltage.
Switch (1S), Power ..................... Controls 120VAC to kettle control circuit
Temperature Controller .................. Cycles power to regulating contactor (2CON) to maintain the set
point temperature. An external set point potentiometer is used
for temperature adjustments.
Lamp (1LT), Power ..................... Amber (AM) colored lamp. On when power switch is on.
Lamp (2LT), Low Water .................. Red (RD) colored lamp. On when water level in the reservoir
jacket drops below water level (LLCO) probe.
Lamp (3LT), Heat ....................... Amber (AM) colored lamp. On when temperature controller is
calling for heat.
Page 19 of 28
F35496 (August 2009)
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
COMPONENT LOCATION
F35496 (August 2009) Page 20 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
F35496 (August 2009)Page 21 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
WATER LEVEL CONTROL
(WLC LLCO)
The water level control provides low level cut-off protection to shut off the heat source in case the fluid level in the
kettle reservoir jacket drops below the WLC LLCO probe. A single low level cut-off probe (LLCO) is connected to
the control.
The water level control has input voltage of 120VAC across terminals L1 and L2 which powers the primary side of
the transformer on the board. One side of the transformer secondary is powered through a series path to chassis
ground. The other side of the transformer secondary (12VAC) is connected to the LLCO probe that supplies power
to the LLCO relay coil on the board. When the kettle is in the full upright position and the reservoir jacket fluid is at
the proper level, the fluid is in constant contact with the LLCO probe and the circuit is completed.
When the power switch is turned ON, power is supplied to the water level control. With the kettle in the full upright
position and the fluid level in the reservoir jacket in contact with the LLCO probe, the LLCO relay coil is energized.
The LLCO relay contacts WLC LLCO-NC open, WLC LLCO-NO close and the LLCO LED turns on. When the
kettle is tilted to empty the contents, the fluid is no longer in contact with the LLCO probe and the circuit is open.
The LLCO relay coil is de-energized and LLCO LED turns off.
F35496 (August 2009) Page 22 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
SEQUENCE OF OPERATION
1. Conditions.
A. Kettle connected to correct voltage supply and is properly grounded.
1) 120VAC potential across X2 and X1 on secondary of main transformer.
B. Power switch and light (1LT) (amber) are off.
C. Low water light (2LT) (red) is off.
D. Pressure switch (1PAS) contacts closed.
E. Temperature dial at lowest setting (potentiometer fully CCW).
1) Internal relay contacts N.O. are open.
F. Kettle at room temperature and in the full upright position.
2. Power switch turned ON.
A. Power light (1LT) (amber) comes on.
B. Power from secondary of main transformer to control circuit thru pressure switch (1PAS) N.C. contacts.
3. Water level control (WLC) energized.
A. WLC LLCO probe satisfied (fluid in kettle reservoir jacket at proper level).
1) LLCO LED comes on.
B. WLC LLCO N.C. contacts open. Low water light (2LT) (red) remains off.
C. WLC LLCO N.O. contacts close.
1) Limiting contactor (1CON) energized (power to one side of heating elements).
2) Power to temperature controller.
4. Set the temperature dial to call for heat (warm/simmer/boil).
A. 120VAC output from T8 on temperature controller.
1) Heat light (3LT) (amber) comes on.
2) Regulating contactor (2CON) energized and heating elements are powered.
5. Kettle reaches set point temperature.
A. Voltage output removed from T8 on temperature controller.
1) Heat light (3LT) (amber) goes out.
2) Regulating contactor (2CON) de-energized and powered is removed from heating elements.
6. Kettle heat cycles with the temperature controller.
7. Kettle tilted to empty contents.
A. WLC LLCO probe no longer satisfied (fluid in kettle reservoir jacket not in contact with probe). Water
level control (WLC) LLCO relay de-energized.
1) LLCO LED turns off.
B. WLC (LLCO) N.C. contacts close and low water light (2LT) (red) comes on.
C. WLC (LLCO) N.O. contacts open and power is removed from heating circuit.
8. Kettle returned to upright position. Water level control (WLC) circuit returns to normal operation and heating
cycle resumes. Kettle heating will continue to cycle with the temperature controller until the temperature dial is
turned fully CCW or power switch is turned OFF.
Page 23 of 28
F35496 (August 2009)
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
SCHEMATIC DIAGRAM
F35496 (August 2009) Page 24 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
WIRING DIAGRAMS
Heating Element Wiring
Page 25 of 28
F35496 (August 2009)
ELECTRIC COUNTER TOP TILTING KETTLES - ELECTRICAL OPERATION
F35496 (August 2009) Page 26 of 28
ELECTRIC COUNTER TOP TILTING KETTLES - TROUBLESHOOTING
TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES
Kettle does not heat, power light is lit, heat
light is lit, low water light is not lit.
Kettle does not heat, power light is lit, low
water light is lit, heat light is not lit.
Kettle does not heat, power light is lit, low
water light is not lit, heat light is not lit.
Kettle does not heat, power light is not lit. 1. Main circuit breaker off; or control circuit fuse F1 or F2 open.
1. Limiting contactor (1CON) malfunction.
2. Regulating contactor (2CON) malfunction.
3. Heating element malfunction.
1. Fluid level in reservoir jacket below water level probe (LLCO).
2. Water level probe (LLCO) wiring connection malfunction; or
probe coated (not sensing fluid); or probe malfunction.
3. Water level control malfunction.
1. Pressure switch (1PAS) malfunction.
2. Temperature sensor malfunction; potentiometer malfunction or
temperature controller malfunction.
3. Interconnecting wiring malfunction.
2. Supply voltage incorrect.
3. Main transformer (1T) malfunction.
4. Power switch off or malfunction.
5. Interconnecting wiring malfunction.
Kettle heats up slow or will not boil
product.
1. No vacuum in reservoir jacket when kettle is cold.
2. Supply voltage incorrect.
3. Heating element malfunction.
4. Temperature sensor malfunction; or potentiometer
malfunction; or temperature controller malfunction.
Page 27 of 28
F35496 (August 2009)
ELECTRIC COUNTER TOP TILTING KETTLES
F35496 (August 2009) Printed in U.S.A.
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