Page 1
SERVICE MANUAL
VPX SERIES
ELECTRIC
COUNTERTOP
STEAMERS
MODEL ML
VPX3 126586
VPX5 126588
- NOTICE This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualifie d. If you have attended a Vulcan Service School for thi s
product, you may be qualified to perform all the procedures
described in this manu al.
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, i n s truments and skills
required to perf orm the proce dure. Pr ocedur es for which you do
not have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
Repr oduction or other use of this Manual, without the ex press
written consent of Vulcan-Hart, is prohibited.
A product of VULCAN-HART LOUISVILLE, KY 40201-0696
F25111 (March 2002)
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VPX SERIES STEAMERS
TABLE OF CONTENTS
GENERAL ................................................................................3
Installation, Operation and Cleaning ........................................................3
Introduction ............................................................................3
Features ..........................................................................3
Steam Cooking.....................................................................3
Model Designations .................................................................3
Specifications..........................................................................3
Water Requirements ................................................................3
Electric ...........................................................................3
Tools.................................................................................3
REMOVAL AND REPLACEMENT OF PARTS ....................................................4
Covers and Panels ...................................................................... 4
Component Panel Components ...........................................................5
Timer ................................................................................5
Standby Thermostat ..................................................................... 5
High Limit Thermostat ...................................................................6
Temperature Probe .....................................................................6
Heating Element Assembly ...............................................................6
Manual Drain Valve .....................................................................8
Door ................................................................................10
SERVICE PROCEDURES AND ADJUSTMENTS ................................................12
Door Latch Adjustment .................................................................12
Door Sealing Adjustment................................................................12
Heating Element Test ..................................................................13
Temperature Control Calibration ..........................................................13
ELECTRICAL OPERATION .................................................................14
Component Function ...................................................................14
Component Location ...................................................................15
Sequence of Operation .................................................................15
Wiring Diagrams ......................................................................18
TROUBLESHOOTING...................................................................... 20
CONDENSED SPARE PARTS LIST ...........................................................21
© Vulcan 2002
F25111 (March 2002)
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Page 3
VPX SERIES STEAMERS - GENERAL
GENERAL
INSTALLATION, OPERATION
AND CLEANING
Hardness of 2-3 grains (34-35ppm)
Total dissolved solids (TDS) less than 60ppm
Ph factor of 7.0 to 7.5
Refer to the Installation & Operation Manual for
specific instructions.
NOTE:
Daily cleaning is required.
INTRODUCTION
Features
Requires no water or drain line connections
(manual fill & manual drain)
Cast aluminum "element block" for efficient
heat transfer and distribution
Field convertible to single phase or three
phase power
When wired for single phase, a reduced 2/3
power output is available
Steam Cooking
The VPX series steamer provides timed
continuous
mode cooking in a "pressure-less"
compartment. The small physical size of the
steamer offers an efficient way to produce many
foods in small batches. Pressure-less, 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
"pressure-less" cooking compartment allows the
operator to open and close the door, anytime during
a cooking cycle.
or
These specifications can easily be obtained
with the use of a properly maintained water
softener.
2.5 gallons to fill holding pan (approximate)
Electric
AMPERAGE PER LINE (60HZ)
MODEL
VPX3
VPX5
NOTES
TOTAL
KW
9.0 std. 25.0 21.7 10.9 43.3 37.5
3
6.0
15.0 std. 41.7 36.1 18.1 72.2 62.5
3
10.0
1. Amperage values in the table are nominal.
:
Tolerance is +5/-10%.
2. All models are shipped for three phase
connections. If a single phase connection
is needed, the steamer is field convertible.
Requires jumper wire changes at terminal
block. See wiring diagram 7264.
3. Field convertible to a reduced kw output
(2/3 power connection). Requires jumper
wire changes at terminal block
diagram 7264.
3 PHASE
208V 240V 480V 208V 240V
- - - 28.9 25.0
- - - 48.1 41.7
2
TOOLS
Standard
1 PHASE
See wiring
.
1
2
Model Designations
VPX3 - 3 pan capacity*
VPX5 - 5 pan capacity*
*based on 2.5 inch pan depth
Exterior Dimensions
VPX3 - 21"w x 25"d x 25" h*
VPX5 - 21"w x 25"d x 31.5" h*
*Includes 4" legs and 2" steam vent height
SPECIFICATIONS
Water Requirements
Use "potable" tap water that meets the following
specifications:
Special
Page 3 of 20
Standard set of hand tools
Clear silicone sealant
VOM with an AC current tester (any qualit y
VOM with a sensitivity of at least 20, 000 ohms
per volt can be used)
Temperature meter & thermocouple
Thermal Transfer Compound, Dow Corning
340 P/N 819643-2 or equivalent
: The additional tools below are required
NOTE
if replacing heating element assembly.
Torque wrench (in-lb.)
Tile Trowel 3/16" x 5/32" V notch; Grainger
catalog stock number 5LG08 or equivalent
Loctite 271 or equivalent
F25111 (March 2002)
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
Right Side Panel
1. Remove screws from bottom of panel.
2. Slide panel down to clear top cover.
DISCONNECT THE ELECTRICAL
4. Pull the combination left side and rear panel off.
5. Reverse procedure to install.
Lower Front Cover
1. Remove screws from the lower front cover.
3. Reverse procedure to install.
Top Cover
1. Remove screws from the top rear of cover.
2. Push up on rear of cover to clear steam vent
pipe and slide forward to clear the front lip.
3. Lift the cover off the cabinet.
4. Reverse procedure to install.
Left Side and Rear Panel
1. Remove top cover as outlined under "TOP
COVER".
2. Disconnect electrical supply at terminal block.
3. Remove screws at bottom of panel.
2. Open the door, cut the bead of silicone at the
top rear of cover then remove cover.
3. Clean silicone residue from mating surfaces.
4. Reverse procedure to install and apply silicone
sealant at the top rear of cover.
COMPONENT PANEL
COMPONENTS
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove right side panel as outlined under
"COVERS AND PANELS".
2. Disconnect lead wires to component being
replaced.
3. Remove component.
NOTE:
and remove nut from shaft.
DISCONNECT THE ELECTRICAL
To remove temperature control, pull knob off
F25111 (March 2002)
Page 4 of 20
Page 5
VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
4. Reverse procedure to install replacement
component and check steamer for proper
operation.
NOTE:
"TEMPERATURE CONTROL CALIBRATION ADJUSTMENT FOR ELEVATION" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
If replacing temperature control, see
TIMER
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
DISCONNECT THE ELECTRICAL
3. Grasp thermostat body and push up to slide
holding tabs out from mounting bracket.
4. Apply a small amount of "thermal transfer
compound" to the mating surface (disk side) of
the replacement thermostat.
A. Spread the compound completely and
evenly over the surface of the thermostat.
5. Reverse procedure from step 3 to install and
check steamer for proper operation.
1. Remove right side panel as outlined under
"COVERS AND PANELS".
2. Disconnect lead wires to timer.
3. Loosen two set screws on dial and pull timer
knob from shaft.
4. Remove nut from timer shaft and remove timer.
5. Reverse procedure to install.
STANDBY THERMOSTAT
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove right side panel as outlined under
"COVERS AND PANELS".
2. Pull insulation back to expose standby
thermostat and disconnect lead wires.
DISCONNECT THE ELECTRICAL
HIGH LIMIT THERMOSTAT
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove right side panel as outlined under
"COVERS AND PANELS".
2. Pull insulation back to expose high limit
thermostat and disconnect lead wires.
DISCONNECT THE ELECTRICAL
3. Remove thermostat from heating element
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assembly.
F25111 (March 2002)
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
NOTE:
threaded stem.
4. Apply a small amount of "thermal transfer
5. Reverse procedure from step 3 to install and
NOTE:
limit or damage to the mounting threads may occur.
Thermostat base is a brass 5/8" hex with a
compound" to the mating surface (disk side) of
the replacement thermostat.
A. Spread the compound completely and
evenly over the surface of the thermostat.
check steamer for proper operation.
Do not cross thread or over tighten the high
TEMPERATURE PROBE
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove all covers and panels as outlined
under "COVERS AND PANELS".
2. Disconnect probe leads from the temperature
control.
DISCONNECT THE ELECTRICAL
NOTE:
sheets of insulation from top, rear and left side, and
the bottom. Retain insulation for use during reassembly.
1. Remove all covers and panels as outlined
2. From the rear, tilt steamer until it rests on door.
3. Grasp component panel and remove screws
As the steamer is disassembled, remove the
under "COVERS AND PANELS".
A. Place wooden blocks opposite door handle
to level and support steamer.
securing it to the base.
A. Lower component panel and leave at the
side of steamer so that all the component
lead wires can remain connected.
3. Remove temperature probe from steam vent
pipe.
4. Reverse procedure to install replacement probe.
5. Adjust temperature control as outlined under
"TEMPERATURE CONTROL CALIBRATION"
in "SERVICE PROCEDURES AND
ADJUSTMENTS".
HEATING ELEMENT ASSEMBLY
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
DISCONNECT THE ELECTRICAL
4. Remove screws securing base to steamer
support frame.
The heating element assembly contains three
elements molded into a cast aluminum block. The
block is mounted on the underside of cooking
compartment.
F25111 (March 2002)
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Page 7
VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
5. Remove mounting nuts & washers from the rear
cooking compartment support legs and remove
base.
7. Disconnect high limit thermostat lead wires and
remove high limit from heating element
assembly.
8. Remove heating element assembly from
steamer.
6. Disconnect heating element lead wires from
element terminals.
9. Clean Loctite residue from heating element
10. Apply approximately 4 oz. of heat transfer
11. Mount replacement heating element assembly
Page 7 of 20
assembly mounting stud threads.
compound to the mating surface (side opposite
markings) on the heating element assembly.
A. Using a tile trowel, spread the compound
evenly over the surface of the assembly.
to the underside of cooking compartment.
F25111 (March 2002)
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
A. Temporarily install a flat washer and nut on
all mounting studs.
B. Tighten each nut to 100 in-lb using the
sequence as shown.
Hand tighten only
.
A. Place wooden blocks opposite door handle
to level and support steamer.
3. Grasp component panel and remove screws
securing it to the base.
A. Lower component panel and leave at side
of steamer so that all the component lead
wires can remain connected.
C. Remove nut and washer from each
mounting stud.
D. Apply Loctite 271 to heating element
assembly mounting stud threads.
E. Stack two new spring disk washers
(Belleville) together and install on each
stud.
1) Tighten each nut to 45 in-lb using the
same sequence as shown.
12. Reverse procedure to re-assemble from step 7
and check steamer for proper operation.
MANUAL DRAIN VALVE
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove all covers and panels as outlined
under "COVERS AND PANELS".
DISCONNECT THE ELECTRICAL
4. Remove screws securing base to steamer
support frame.
2. From the rear, tilt steamer until it rests on door.
F25111 (March 2002)
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Page 9
VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
5. Remove mounting nuts & washers from the rear
cooking compartment support legs and remove
base.
6. Remove outer nut on drain valve stem and lift
off drain handle assembly.
DOOR
WARNING:
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
Removal
1. Remove top cover as outlined under "COVERS
AND PANELS".
2. Open the door.
3. Pull hinge rod up.
4. Reverse procedure to install, making sure the
door bushings are in place.
DISCONNECT THE ELECTRICAL
7. Remove manual drain valve from cooking
compartment drain pipe.
8. Clean thread sealant residue from drain pipe
threads and apply new sealant.
9. Install a replacement drain valve.
A. Tighten valve body so that actuator stem is
pointing towards front of steamer.
10. Reverse procedure to re-assemble from step 6
and check steamer for proper operation.
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F25111 (March 2002)
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
Gasket
1. Open the door.
2. Remove screws from the gasket plate.
3. Pull the gasket plate out from the door housing
and remove the gasket.
4. Position the new gasket on the gasket plate and
reverse the procedure to install. Adjust the door
as outlined under "DOOR SEALING
ADJUSTMENT".
NOTE:
Do not over tighten gasket plate screws as
this will compress the gasket excessively and
interfere with proper door sealing.
4. Remove the nuts and spacers from the handle
screws and remove the handle from the door.
NOTE:
When installing the spacers, the smaller
diameter fits into the slot in the door and the latch
lever must rest on top of the handle latch screw.
Handle
1. Open the door.
2. Remove screws from the top and bottom of the
door.
3. Pull the "inner" door panel out from the door
housing with the gasket plate and gasket still
attached.
F25111 (March 2002)
5. Reverse procedure to install.
Page 10 of 20
Page 11
VPX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
Latch Assembly
1. Open the door.
2. Remove screws from the top and bottom of the
door.
3. Pull the "inner" door panel out from the door
housing with the gasket plate and gasket still
attached.
4. Remove the screws from the side edge of the
door that secure the latch mechanism and
remove the latch from the door.
NOTE:
top of the handle latch screw.
5. Reverse procedure to install.
When installing, the latch lever must rest on
SERVICE PROCEDURES AND ADJUSTMENTS
WARNING:
MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL
TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST
EQUIPMENT AND REAPPLY POWER TO TEST.
DOOR LATCH ADJUSTMENT
Should the steamer door "jam" and can not be
opened,
damage will occur.
First, try lifting up on the bottom of the door at the
handle end, to disengage the latch.
If that does not work, remove the right side panel.
The striker that catches on the "door latch" is
located behind the front face of the cooking cavity.
Remove the nut from the striker and this will release
it from the panel.
CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR
Remove any burrs on the striker that may cause the
latch to stick.
Reinstall the striker and adjust, so door will not jam.
DO NOT FORCE OR PRY
the door as
Once the nut and washer have been removed, door
will open freely.
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F25111 (March 2002)
Page 12
VPX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
To adjust
1. Reinstall the striker with the slot pointing
2. Close the door to center the striker in the oval
3. Open the door and check the strikers’ slot for
:
upwards and "hand tighten" nut only.
mounting hole.
horizontal alignment. The slot on the striker
must be kept horizontal in order for the door
latch to catch it properly and latch.
6. If necessary, tighten all screws an additional ½
turn and repeat step 5.
7. Repeat step 6 until the door closes properly and
no steam "leaks" are seen around the gasket
seal.
HEATING ELEMENT TEST
WARNING:
POWER TO BE APPLIED TO THE UNIT DURING
THE TEST. USE EXTREME CAUTION AT ALL
TIMES.
1. Turn cooking mode switch to "continuous".
2. Measure voltage at heating element terminals
and verify it against data plate voltage.
A. If voltage is incorrect
B. If voltage is correct
NOTE:
resistance check when a clamp on type amp
meter is available.
THE FOLLOWING STEPS REQUIRE
, find the source of the
problem.
, check current draw
(amps) through the heating element lead
wires.
This method is preferred over a
4. Once the proper slot alignment has been set,
hold the striker close to its base using a rag and
vise grips, then tighten the striker nut. Be
careful not to damage the striker "slot" when
tightening or door may not latch properly.
NOTE:
to turn and change alignment.
Do not over tighten as the striker will begin
DOOR SEALING ADJUSTMENT
On initial installation of new door gaskets, the door
will be hard to close. This is required for proper
gasket fit. As the door is used, it becomes easier to
close after a few days.
1. Check the door gasket quality. If damaged or
worn, replace as outlined under "DOOR".
2. Loosen screws until the screw heads no longer
touch the gasket plate.
1) If current draw is correct then heating
element is functioning properly.
table below for proper values.
2) If current draw is not
cooking mode switch to OFF and
disconnect the electrical supply.
a. Replace heating element then
proceed to step 3.
C. If unable to check current draw, a
resistance check may
malfunctioning element.
1) Turn the cooking mode switch to OFF
and
disconnect the electrical supply.
2) Remove the lead wires from the heating
element and check resistance (ohms).
See table below for proper values.
3. Check for proper operation.
indicate a
See
correct, turn
3. Tighten screws until screw head touches gasket
plate and at that point begin counting turns.
4. Tighten all screws approximately two turns.
5. Close the door and check unit for proper
operation.
F25111 (March 2002)
Page 12 of 20
Page 13
VPX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
VOLTAGE
208 3 14.4 8.3 14.4
240 3 12.5 7.2 19.2
480 3 3.6 76.8
208 5 24.0 14.0 8.70
240 5 21.0 12.0 11.5
480 5 6.0 46.0
NOTES:
KW PER
ELEMENT
1. Values in the table are nominal.
Tolerance is +5/-10%.
2. Voltage values are @ 60HZ.
3. Each heating element assembly
contains 3 elements. Total KW would
be the individual element KW times 3.
4. Resistance values (ohms) are @ room
temperature.
AMPS PER
ELEMENT
1 PH 3 PH
OHMS PER
ELEMENT
TEMPERATURE CONTROL
CALIBRATION
To set the temperature control for optimum steamer
operation, the elevation above sea level for the
service location must
The elevation is used in conjunction with the
elevation table below, to determine the correct set
point temperature for the control.
first be determined.
ELEVATION
(FT)
TEMPERATURE
(°F)
Sea Level 210
1,000 208
2,000 206
3,000 204
4,000 202
5,000 200
6,000 198
7,000 196
8,000 195
9,000 or above 194
A. If the set point temperature of the control
is correct, no adjustment is necessary.
B. If the set point temperature of the control
is not correct, adjust the temperature
control. Repeat step 4 until the correct
temperature is achieved.
1) Turn the temperature control dial
clockwise
counterclockwise
to increase temperature or
to decrease
temperature.
NOTE:
If the set point temperature is too high, the
excess boiling action will cause water droplets to
exit the steam vent pipe, and cause high water
usage.
1. Remove right side panel as outlined under
"COVERS AND PANELS".
2. Place a thermocouple approximately one inch
down in the center of steam vent pipe.
3. Turn steamer on by selecting "continuous"
mode.
4. Allow steamer temperature to stabilize by
completing two heating cycles.
5. Record the temperature reading when "heater"
light goes out.
6. Using the elevation table, compare the
recorded
temperature to the temperature listed
for the specific elevation.
NOTE:
Use temperature scale on control dial plate
for reference only. The scale represents dial turns in
1°F increments, not the actual temperature. When
calibrating, use the recorded temperature taken
from thermocouple.
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F25111 (March 2002)
Page 14
VPX SERIES STEAMER - ELECTRICAL OPERATION
ELECTRICAL OPERATION
COMPONENT FUNCTION
Buzzer ..................
Contactor ...............
Relay R1 ................
Transformer .............
Heater Light (green) ......
Low Water Light (red) .....
Cooking Mode Switch
(with pilot lights) .........
Door Switch .............
High Limit
Thermostat ..............
Temperature Control .....
Standby Thermostat ......
Timer ...................
Signals end of a "cook" cycle when cooking time expires.
Supplies line voltage to heating element assembly.
Supplies power to temperature control.
Provides 240V to the control circuit (480V only).
Indicates steamer is heating.
Indicates additional water is required in cooking compartment.
Supplies 240V to the control circuit. Two internal "pilot" lights indicate the
cooking mode selected. Timed mode is amber; Continuous mode is red.
Removes control circuit power from steamer when door is opened.
Protects steamer by removing control circuit power if the heating element
assembly temperature goes above 350°F (+/-15; 50°F differential).
Monitors temperature probe and cycles power to heater contactor for st eam
generation.
Maintains steamer at a standby temperature of 168°F (+5/-8) when "cook" timer
is off (timed mode only).
Counts "cook" time of product when time is dialed and energizes buzzer when
time expires. To silence buzzer, dial must be turned to off.
Temperature Probe .......
COMPONENT LOCATION
Senses cooking compartment temperature and sends a corresponding DC
voltage back to the temperature control (J-type thermocouple).
F25111 (March 2002)
Page 14 of 20
Page 15
VPX SERIES STEAMER - ELECTRICAL OPERATION
SEQUENCE OF OPERATION
Wiring diagram 7264 will be used to explain the
electrical sequence of operation.
Timed Cooking Mode
1. Conditions.
A. Steamer connected to correct voltage and
is properly grounded.
B. Cooking mode switch (power) off.
C. High limit thermostat closed.
D. Standby thermostat closed.
E. Temperature control is setup properly and
is ready to use.
F. Door closed (door switch closed).
G. Timer "off".
H. Cooking compartment filled to the water
level mark and below standby temperature
of 168°F (+5/-8).
NOTE:
is in a "pre-heat" state.
2. Select "timed" on the cooking mode switch.
3. Temperature control energized and evaluates
4. Temperature reaches 168°F and standby
At temperatures below 168°F, the steamer
A. Internal "pilot" light (top, amber) comes
on.
B. Internal "pilot" light (bottom, red) comes
on.
C. Relay "R1" energized.
1) R1-2A & R1-2B (both N.C.) open.
2) R1-3A & R1-3B (both N.O.) close.
input from thermocouple.
A. With temperature below set point, internal
relay contacts close.
1) Heater light (green) comes on.
2) Contactor energized and heating
elements are powered.
thermostat opens.
A. Internal "pilot" light (top, amber) goes out.
NOTE:
temperature until a "cook" time is dialed on
timer; or the cooking mode switch is turned to
off or continuous; or the door is opened.
B. Relay "R1" de-energized.
Steamer will maintain standby
1) R1-2A & R1-2B return to N.C.
position.
2) R1-3A & R1-3B return to N.O.
position.
a. Temperature control de-
energized and internal relay
contacts open.
a) Contactor de-energized and
power removed from heating
elements.
5. Set "cook" timer to desired time.
A. Timer contacts 1 & 3 close, timer motor is
energized and timing down begins.
NOTE:
timer can be turned off throughout the cooking
cycle. If turned to off, steamer reverts to
standby temperature.
6. Temperature reaches set point and the
temperature control’s internal relay contacts
open.
A. Contactor de-energized and power is
7. Steamer cycles on the temperature control until
"cook" time expires.
8. Time expires on "cook" timer.
A. Timer contacts 1 & 3 open, timer motor is
B. Timer contacts 1 & 4 close.
9. Turn "cook" timer off.
A. Steamer reverts to standby temperature
NOTE:
cycling, high limit thermostat will open and low
water light (red) will come on.
Continuous Cooking Mode
1. Conditions.
A. Steamer connected to correct voltage and
B. Cooking mode switch (power) off.
C. High limit thermostat closed.
D. Standby thermostat closed.
E. Temperature control is setup properly and
Additional time can be set or the "cook"
removed from heating elements.
de-energized and timing stops.
1) Buzzer energized and sounds.
NOTE:
until timer dial is set to off position or
additional time is set.
and continues to cycle until a "cook" time
is dialed on timer; or the cooking mode
switch is turned to off or continuous; or the
door is opened.
is properly grounded.
is ready to use.
The buzzer continues to sound
If water level becomes low during
Page 15 of 20
F25111 (March 2002)
Page 16
VPX SERIES STEAMER - ELECTRICAL OPERATION
F. Door closed (door switch closed).
G. Timer "off".
H. Cooking compartment filled to the water
level mark and below standby temperature
of 168°F (+5/-8).
2. Select "continuous" on the cooking mode
switch.
A. Internal "pilot" light (top, amber) comes
on.
B. Internal "pilot" light (bottom, red) comes
on.
C. Relay "R1" energized.
1) R1-2A & R1-2B (both N.C.) open.
2) R1-3A & R1-3B (both N.O.) close.
3. Temperature control energized and evaluates
input from thermocouple.
A. With temperature below set point, internal
relay contacts close.
1) Heater light (green) comes on.
2) Contactor energized and heating
elements are powered.
4. Temperature reaches 168°F and standby
thermostat opens.
A. Internal "pilot" light (top, amber) goes out.
NOTE:
Standby thermostat does not effect
continuous mode operation and the "cook"
timer is not used.
5. Temperature reaches set point and the
temperature control’s internal relay contacts
open.
A. Contactor de-energized and power is
removed from heating elements.
6. Steamer continues to cycle on the temperature
control until the cooking mode switch is turned
to off or timed; or the door is opened.
NOTE:
If water level becomes low during cycling,
high limit thermostat will open and low water light
(red) will come on.
F25111 (March 2002)
Page 16 of 20
Page 17
208-240V
VPX SERIES STEAMER - ELECTRICAL OPERATION
WIRING DIAGRAMS
Page 17 of 20
F25111 (March 2002)
Page 18
480V
VPX SERIES STEAMER - ELECTRICAL OPERATION
F25111 (March 2002)
Page 18 of 20
Page 19
VPX SERIES STEAMER - TROUBLESHOOTING
TROUBLESHOOTING
WARNING:
MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL
TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST
EQUIPMENT AND REAPPLY POWER TO TEST.
CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TESTS OR
SYMPTOM POSSIBLE CAUSES
Compartment leaks water around door. 1. Steamer not level.
2. Steamer overfilled.
Steam leaks around door. 1. Worn gasket. See "DOOR" in "SERVICE PROCEDURES
AND ADJUSTMENTS".
2. Damaged gasket.
3. Steam vent pipe blocked.
Steam generated inside compartment
when timer is off.
Steamer will not heat (heat light off). 1. Line voltage incorrect.
Steamer will not heat (heat light on). 1. Line voltage incorrect.
Timer motor does not run. 1. Door open or door switch malfunction.
Door not closing properly. 1. Door latch assembly.
Door won’t open. 1. Latch won’t release. See "DOOR LATCH ADJUSTMENT" in
Buzzer not operating. 1. Timer malfunction.
Water spraying out of steam vent pipe
during a "cook" cycle.
High water usage. 1. Temperature control calibration to high. See
Excessive or inconsistent "cook" times. 1. Door left open between loads.
1. Timer malfunction.
2. Contactor malfunction.
3. Temperature control malfunction (heater light on).
2. Control circuit fuse(s) open.
3. High limit thermostat open (low water light off).
4. Door open or door switch malfunction.
5. Cooking mode switch off or inoperative.
6. Relay R1 malfunction.
7. Timer malfunction (timed mode only).
8. Temperature probe malfunction.
9. Temperature control malfunction.
2. Heating element malfunction.
3. Contactor malfunction.
2. Relay R1 malfunction.
3. Timer inoperative.
2. Striker adjustment.
3. Steamer pan not inserted properly.
"SERVICE PROCEDURES AND ADJUSTMENTS".
2. Buzzer malfunction.
1. Temperature control calibration to high. See
"TEMPERATURE CONTROL CALIBRATION ADJUSTMENT FOR ELEVATION" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
2. Temperature probe malfunction.
3. Temperature control malfunction.
4. Contactor malfunction.
"TEMPERATURE CONTROL CALIBRATION ADJUSTMENT FOR ELEVATION" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
2. Temperature probe malfunction.
3. Temperature control malfunction.
4. Steamer operating in "continuous" mode.
2. Temperature control calibration to low.
3. Heating element malfunction.
4. Standby thermostat malfunction.
Page 19 of 20
F25111 (March 2002)
Page 20
VPX SERIES STEAMER - CONDENSED SPARE PARTS LIST
CONDENSED SPARE PARTS LIST
VPX3 & VPX5
PART NUMBER DESCRIPTION NOTES
844385 Door Gasket (VPX5)
844196 Door Gasket (VPX3)
843811 Door Switch
853928 Thermostat - Temperature Control
853956 Thermostat - Standby
853948 Thermocouple Sensor, J-Type
853957 Fuse Block
851929 Fuse, 1Amp 250v (208/240v)
853270 Contactor (208/240v)
853493 High Limit Thermostat
844422 Power Switch (cooking mode switch)
853946 Element assy. 208v 9kW
853945 Element assy. 208v 15kW
853212 Element assy. 240v 9kW
853213 Element assy. 240v 15kW
411690-2 Timer, 60 min.
F25111 (March 2002) Printed in U.S.A.
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