Vulcan-Hart VI2 User manual

- 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 aVulcan ServiceSchool forthisproduct, 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.
SERVICE MANUAL
INDUCTION
COOKERS
MODEL ML
VI2 114713
VI3 114714
VI22 114715
VI33 114716
VI23 114717
Model VI22 shown
A product of VULCAN-HART LOUISVILLE, KY 40201-0696
Form 24591 (Rev. A, 12-98) Supercedes (5-97)

2
TABLE OF CONTENTS
GENERAL............................................................................. 3
Introduction ........................................................................ 3
How to Distinguish a Usable Pan .................................................... 3
UsablePansWhichHaveSlowerRatesofHeatTransfer.................................. 3
Recommended Pans ............................................................. 4
UnusablePans.................................................................. 5
Tools ............................................................................. 5
Location........................................................................... 5
Controls........................................................................... 5
Specifications ...................................................................... 6
Cleaning .......................................................................... 6
REMOVALANDREPLACEMENTOFPARTS ................................................. 7
TopCover ......................................................................... 7
InverterAssembly ................................................................... 7
FanMotors ........................................................................ 8
Controller Board, Led and Potentiometer .................................................. 9
Knob Gasket ....................................................................... 9
InverterCoil........................................................................ 9
High Voltage Board ................................................................. 10
Low Voltage Board .................................................................. 10
EMIBoard ........................................................................ 11
FuseonEMIBoard ................................................................. 11
Thermistor, Tension Spring and Support ................................................. 11
SERVICEPROCEDURESANDADJUSTMENTS .............................................. 12
ThermistorTest .................................................................... 12
ControllerBoardPotentiometerTest .................................................... 12
High Voltage Board Test ............................................................. 12
InverterCoilTest................................................................... 13
PowerOutputAdjustment ............................................................ 13
AccessHoleModification............................................................. 16
TransformerTest................................................................... 18
ELECTRICALOPERATION .............................................................. 18
Component Function ................................................................ 18
Component Location ................................................................ 19
Sequence of Operation .............................................................. 20
PlugLayout ....................................................................... 21
WiringDiagram .................................................................... 22
TROUBLESHOOTING .................................................................. 24
© VULCAN 1997, 1998

INDUCTION COOKERS - GENERAL
3
GENERAL
INTRODUCTION
Model VI2 is a single 2.2KW cooker.
Model VI3 is a single 3KW cooker.
Model VI22 is a double 2.2KW cooker.
Model VI33 is a double 3KW cooker.
Model VI23 is a double cooker with one 2.2KW cooker and one 3KW cooker.
The induction cooktop will not heat the way a resistance heater conducts to the pan. A magnetic induction coil is
beneath the ceramic top. This coil creates a magnetic field that requires a steel or iron pan to complete the
magnetic loop. If the pan is not present, the cooktop stays in a “cool” ready state without using much current. It is
necessary to use iron or steel pans, or special pans designed for induction use. Ceramic, glass, pottery and some
special stainless steel pans will not complete the magnetic loop and, therefore, will not heat properly, and should
not be used.
How to Distinguish a Usable Pan
Put the pan filled with water on the center of the cooktop and turn the control knob to the desired cooking level.
The indicator light will light continuously for a usable pan and will blink for an unusable pan.
Usable Pans Which Have Slower Rates of Heat Transfer
Pans with smaller bottom diameter or partially contacting bottom may be usable but will have reduced heat
transfer rates. These may be acceptable for warming but not for frying.

INDUCTION COOKERS - GENERAL
4
Recommended Pans
Pans made of cast iron, enameled iron, or stainless steel with an iron inner layer are recommended. Stainless
steel pans with 18-0, 18-8, 18-10, and 18-Cr material are acceptable if a magnet will attach itself to the pan and if
the shape of the pan is acceptable. Pans with a flat bottom 5" to 10½" in diameter are recommended. Thin pans
may deform during heating; a thicker wall and bottom are recommended. Pans made of 18-8 stainless steel and
pans with a smaller diameter bottom may have slower rates of heat transfer.

INDUCTION COOKERS - GENERAL
5
Unusable Pans
Pans made of porcelain, earthenware, heat-resistant glass, copper, or aluminum are not recommended because
they do not transfer heat from the magnetic induction field.
TOOLS
•Standard set of hand tools
•VOM with AC current tester (Any VOM with a
sensitivity of at least 20,000 ohms per volt can
be used.)
•Thermal compound Part # 819643
•Demeyere sauce pan with 26cm top opening
and 24cm bottom PMI Part # 424971-1
&
Fiberglass screwdriver Part # 424998-1
&
Field Service Grounding Kit Part #TL-84919
LOCATION
Position the cooktop on a suitable level countertop
surface. Do not locate the cooktop near fryers, a hot
stove, or over an oven. The electrical controls inside
the cooktop will shut down if they overheat (above
110°F). Refer to the Installation and Operation
Manual for complete installation instructions.
CONTROLS
Control Knob Turn counterclockwise to OFF; clockwise to desired cooking level.
Indicator Light:
On Indicates that power is ON and at what cooking level.
Blinking If the indicator light blinks continuously, it indicates the cooktop is in stand-by mode. This
means no pan is detected and heat is OFF. Cooktop will shut off in 3 minutes.
If cooktop is in stand-by and has shut off after 3 minutes, it must be reset. Reset cooktop by
turning control knob to OFF, then ON to desired cooking level.
If the indicator light blinks intermittently for 2 or 3 seconds and then stops, it indicates an
elevated cooking temperature of 380
(
F or higher. This is normal. The cooktop is ensuring
that maximum internal temperatures are not exceeded.
DOUBLE COOKER CONTROLS SHOWN

INDUCTION COOKERS - GENERAL
6
SPECIFICATIONS
MODEL VOLTAGE PLUG
TYPE MAX. AMPS BREAKER SIZE
VI2 208/60/1
220/240/60/1 6-20P 10.6 9.1/9.1 15 15
VI3 208/60/1
220/240/60/1 6-20P 14.6 12.3/12.5 15 15
VI22 208/60/1
220/240/60/1 6-30P 21.2 18.2/18.2 30 30
VI23 208/60/1
220/240/60/1 6-30P 25.2 21.4/21.6 30 30
VI33 208/60/1
220/240/60/1 6-30P 29.2 24.6/25.0 30 30
CLEANING
WARNING: DISCONNECT ELECTRICAL POWER
BEFORE CLEANING.
Clean the ceramic cooktop surface by using a cloth
moistened in warm water, or a solution of detergent
and warm water. For stubborn stains, ScotchBrite or
a soft paste of cleanser may be used; do not use
abrasive materials or harsh scouring action because
this could damage the surface.
Snap out air filters located on the bottom of the
cooktop and wash them in a sink. Dry filters before
reinstalling.
NOTE: Do not operate without filters in place. Filters
must be kept clean to prevent unit from overheating.
Keep area around unit clear to insure proper air
circulation.

INDUCTION COOKERS - REMOVAL AND REPLACEMENT OF PARTS
7
REMOVAL AND REPLACEMENT OF PARTS
TOP COVER
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the screws securing the top cover to
the back of the unit.
2. Turn the unit on its side to access and remove
the screws securing the cover to the bottom.
3. Put the unit upright and pull the top cover
straight off so not to smear the thermal
compound.
4. Disconnect the lead wires at the controller
board if necessary.
5. Reverse procedure to install.
NOTE: There must be sufficient thermal compound
applied to center of inverter coil to contact top cover
when it is installed.
INVERTER ASSEMBLY
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the top cover as outlined under “TOP
COVER”.
2. Identify and disconnect the fan plugs.
3. Remove any cable ties securing fan wires to
inverter frame.
4. Disconnect power leads from terminal block
and remove screws securing terminal block to
base.
5. Remove cable clamp securing ferrite filter on
ground wire.
6. Remove controller board and potentiometer as
outlined in “CONTROLLER BOARD, LED AND
POTENTIOMETER”.
7. Remove six screws securing inverter assembly
to the base.
8. Reverse procedure to install.
9. Apply a liberal amount of thermal compound to
thermistor in center of inverter coil to contact
top cover as noted in “TOP COVER”.
10. Adjust power output as outlined under
“POWER OUTPUT ADJUSTMENT”.

INDUCTION COOKERS - REMOVAL AND REPLACEMENT OF PARTS
8
FAN MOTORS
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the top cover as outlined under “TOP
COVER”.
2. Disconnect the lead wire plug for the fan motor
being removed.
Units Built Before 11/14/97
1. Intake fan only:
A. Snap off filters located underneath unit.
B. Remove screws securing fan housing to
base.
C. Remove fan housing.
D. Remove fan from fan housing.
2. Discharge fan:
A. Remove fan.
Current Production Units
1. Intake fan only:
A. Snap off filters located underneath unit.
B. Remove screws securing fan air deflector
to base.
C. Remove fan air deflector.
D. Remove remaining screws securing fan to
be removed.
2. Reverse procedure to install.
NOTE: Fans have arrows indicating direction of air
flow and rotation. Air flow is entering unit through
base and exiting out rear of unit.

INDUCTION COOKERS - REMOVAL AND REPLACEMENT OF PARTS
9
CONTROLLER BOARD, LED
AND POTENTIOMETER
WARNING: UNPLUG UNIT BEFORE SERVICING.
CAUTION: Certain components in this system
are subject to damage due to electro-static
discharge during field repairs. A Field Service
Kit is available to prevent this damage. This
Field Service Kit must be used anytime a
component or circuit board is handled. Specific
instructions are included with the kit.
1. Remove the top cover as outlined under “TOP
COVER”.
2. Remove the knob by pulling off from the
controller board on the front of the unit.
3. Unplug cable from controller board.
4. Remove the plastic nuts that secure the
controller board to the top cover.
5. Remove potentiometer mounting nut if pot is
being replaced.
6. Unplug LED from board if LED is being
replaced.
7. Reverse procedure to install.
KNOB GASKET
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the controller board as outlined under
“CONTROLLER BOARD, LED AND
POTENTIOMETER”.
2. Pry out gasket from inside top cover.
3. Reverse procedure to install.
INVERTER COIL
WARNING: UNPLUG UNIT BEFORE SERVICING.
CAUTION: Certain components in this system
are subject to damage due to electro-static
discharge during field repairs. A Field Service
Kit is available to prevent this damage. This
Field Service Kit must be used anytime a
component or circuit board is handled. Specific
instructions are included with the kit.
1. Remove the top cover as outlined under “TOP
COVER”.
2. Remove screws holding the inverter coil to the
inverter assembly frame.
NOTE: Watch for spacing washers under inverter
coil between coil and frame on 208 volt units. These
spacers must be installed to insure proper operation.

INDUCTION COOKERS - REMOVAL AND REPLACEMENT OF PARTS
10
3. Position the inverter coil on its side to access
the lead wires.
4. Disconnect the lead wires from the high voltage
board.
NOTE: The lead from the inner portion of the
inverter coil connects to the “L”terminal and the
lead from the outer portion connects to the “M”
terminal. These leads must also be twisted and then
connected properly.
5. Remove thermistor, tension spring and support
as outlined in “THERMISTOR, TENSION
SPRING AND SUPPORT”
6. Reverse procedure to install.
7. Adjust power output as outlined under
“POWER OUTPUT ADJUSTMENT”.
HIGH VOLTAGE BOARD
WARNING: UNPLUG UNIT BEFORE SERVICING.
CAUTION: Certain components in this system
are subject to damage due to electro-static
discharge during field repairs. A Field Service
Kit is available to prevent this damage. This
Field Service Kit must be used anytime a
component or circuit board is handled. Specific
instructions are included with the kit.
1. Remove the top cover as outlined under “TOP
COVER”.
2. Remove the inverter coil as outlined under
“INVERTER COIL”.
3. Disconnect the lead wires for the high voltage
board.
4. Remove the screws that secure the high
voltage board mounting plate to the inverter
assembly frame.
5. Reverse the procedure to install.
6. Adjust power output as outlined under
“POWER OUTPUT ADJUSTMENT”.
LOW VOLTAGE BOARD
WARNING: UNPLUG UNIT BEFORE SERVICING.
CAUTION: Certain components in this system
are subject to damage due to electro-static
discharge during field repairs. A Field Service
Kit is available to prevent this damage. This
Field Service Kit must be used anytime a
component or circuit board is handled. Specific
instructions are included with the kit.
1. Remove the high voltage board as outlined
under “HIGH VOLTAGE BOARD”.
2. Disconnect the lead wires to the low voltage
board.
3. Push in the tabs of the pins that secure the low
voltage board and remove the board from the
mounting plate.
4. Reverse the procedure to install.
5. Adjust power output as outlined under
“POWER OUTPUT ADJUSTMENT”.