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
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-Hart, is prohibited.
A product of VULCAN-HART
LOUISVILLE, KY 40201-0696
F25111 (March 2002)
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VPX SERIES STEAMERS - GENERAL
GENERAL
Hardness of 2-3 grains (34-35ppm)
INSTALLATION, OPERATION
AND CLEANING
Total dissolved solids (TDS) less than 60ppm
Ph factor of 7.0 to 7.5
These specifications can easily be obtained
with the use of a properly maintained water
softener.
Refer to the Installation & Operation Manual for
specific instructions.
NOTE: Daily cleaning is required.
2.5 gallons to fill holding pan (approximate)
INTRODUCTION
Electric
AMPERAGE PER LINE (60HZ) 1
3 PHASE 2 1 PHASE 2
208V 240V 480V 208V 240V
Features
TOTAL
KW
MODEL
Requires no water or drain line connections
(manual fill & manual drain)
9.0 std. 25.0 21.7 10.9 43.3
6.0 3
28.9
15.0 std. 41.7 36.1 18.1 72.2
10.0 3
48.1
37.5
25.0
62.5
41.7
Cast aluminum "element block" for efficient
heat transfer and distribution
VPX3
-
-
-
Field convertible to single phase or three
phase power
VPX5
-
-
-
When wired for single phase, a reduced 2/3
power output is available
1. Amperage values in the table are nominal.
Tolerance is +5/-10%.
NOTES:
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. See wiring
diagram 7264.
Steam Cooking
The VPX series steamer provides timed or
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.
TOOLS
Standard
Model Designations
Standard set of hand tools
Clear silicone sealant
VPX3 - 3 pan capacity*
VPX5 - 5 pan capacity*
VOM with an AC current tester (any quality
VOM with a sensitivity of at least 20,000 ohms
per volt can be used)
*based on 2.5 inch pan depth
Exterior Dimensions
Temperature meter & thermocouple
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
Special
Thermal Transfer Compound, Dow Corning
340 P/N 819643-2 or equivalent
NOTE: The additional tools below are required
if replacing heating element assembly.
SPECIFICATIONS
Torque wrench (in-lb.)
Water Requirements
Tile Trowel 3/16" x 5/32" V notch; Grainger
catalog stock number 5LG08 or equivalent
Use "potable" tap water that meets the following
specifications:
Loctite 271 or equivalent
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
WARNING: DISCONNECT THE ELECTRICAL
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.
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.
2. Slide panel down to clear top cover.
3. Reverse procedure to install.
Top Cover
1. Remove screws from the top rear of cover.
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: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
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 right side panel as outlined under
"COVERS AND PANELS".
2. Disconnect lead wires to component being
replaced.
1. Remove top cover as outlined under "TOP
COVER".
3. Remove component.
2. Disconnect electrical supply at terminal block.
3. Remove screws at bottom of panel.
NOTE: To remove temperature control, pull knob off
and remove nut from shaft.
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
4. Reverse procedure to install replacement
component and check steamer for proper
operation.
NOTE: If replacing temperature control, see
"TEMPERATURE CONTROL CALIBRATION -
ADJUSTMENT FOR ELEVATION" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
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.
TIMER
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
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".
HIGH LIMIT THERMOSTAT
2. Disconnect lead wires to timer.
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
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.
1. Remove right side panel as outlined under
"COVERS AND PANELS".
STANDBY THERMOSTAT
2. Pull insulation back to expose high limit
thermostat and disconnect lead wires.
WARNING: DISCONNECT THE ELECTRICAL
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.
3. Remove thermostat from heating element
assembly.
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
NOTE: Thermostat base is a brass 5/8" hex with a
threaded stem.
NOTE: As the steamer is disassembled, remove the
sheets of insulation from top, rear and left side, and
the bottom. Retain insulation for use during re-
assembly.
4. Apply a small amount of "thermal transfer
compound" to the mating surface (disk side) of
the replacement thermostat.
1. Remove all covers and panels as outlined
under "COVERS AND PANELS".
A. Spread the compound completely and
evenly over the surface of the thermostat.
2. From the rear, tilt steamer until it rests on door.
5. Reverse procedure from step 3 to install and
check steamer for proper operation.
A. Place wooden blocks opposite door handle
to level and support steamer.
3. Grasp component panel and remove screws
securing it to the base.
NOTE: Do not cross thread or over tighten the high
limit or damage to the mounting threads may occur.
A. Lower component panel and leave at the
side of steamer so that all the component
lead wires can remain connected.
TEMPERATURE PROBE
WARNING: DISCONNECT THE ELECTRICAL
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.
3. Remove temperature probe from steam vent
pipe.
4. Remove screws securing base to steamer
support frame.
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: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
The heating element assembly contains three
elements molded into a cast aluminum block. The
block is mounted on the underside of cooking
compartment.
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
7. Disconnect high limit thermostat lead wires and
remove high limit from heating element
assembly.
8. Remove heating element assembly from
steamer.
5. Remove mounting nuts & washers from the rear
cooking compartment support legs and remove
base.
6. Disconnect heating element lead wires from
element terminals.
9. Clean Loctite residue from heating element
assembly mounting stud threads.
10. Apply approximately 4 oz. of heat transfer
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.
11. Mount replacement heating element assembly
to the underside of cooking compartment.
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
A. Temporarily install a flat washer and nut on A. Place wooden blocks opposite door handle
to level and support steamer.
all mounting studs. Hand tighten only.
3. Grasp component panel and remove screws
securing it to the base.
B. Tighten each nut to 100 in-lb using the
sequence as shown.
A. Lower component panel and leave at side
of steamer so that all the component lead
wires can remain connected.
4. Remove screws securing base to steamer
support frame.
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: DISCONNECT THE ELECTRICAL
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. From the rear, tilt steamer until it rests on door.
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VPX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS
5. Remove mounting nuts & washers from the rear
DOOR
cooking compartment support legs and remove
base.
WARNING: DISCONNECT THE ELECTRICAL
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.
6. Remove outer nut on drain valve stem and lift
off drain handle assembly.
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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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.
5. Reverse procedure to install.
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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: When installing, the latch lever must rest on
top of the handle latch screw.
5. Reverse procedure to install.
SERVICE PROCEDURES AND ADJUSTMENTS
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, ATTACH TEST
EQUIPMENT AND REAPPLY POWER TO TEST.
Remove any burrs on the striker that may cause the
latch to stick.
DOOR LATCH ADJUSTMENT
Reinstall the striker and adjust, so door will not jam.
Should the steamer door "jam" and can not be
opened, DO NOT FORCE OR PRY the door as
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.
Once the nut and washer have been removed, door
will open freely.
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VPX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
6. If necessary, tighten all screws an additional ½
To adjust:
turn and repeat step 5.
1. Reinstall the striker with the slot pointing
upwards and "hand tighten" nut only.
7. Repeat step 6 until the door closes properly and
no steam "leaks" are seen around the gasket
seal.
2. Close the door to center the striker in the oval
mounting hole.
HEATING ELEMENT TEST
3. Open the door and check the strikers’ slot for
horizontal alignment. The slot on the striker
must be kept horizontal in order for the door
latch to catch it properly and latch.
WARNING: THE FOLLOWING STEPS REQUIRE
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, find the source of the
problem.
B. If voltage is correct, check current draw
(amps) through the heating element lead
wires.
NOTE: This method is preferred over a
resistance check when a clamp on type amp
meter is available.
1) If current draw is correct then heating
element is functioning properly. See
table below for proper values.
2) If current draw is not correct, turn
cooking mode switch to OFF and
disconnect the electrical supply.
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.
a. Replace heating element then
proceed to step 3.
C. If unable to check current draw, a
resistance check may indicate a
malfunctioning element.
NOTE: Do not over tighten as the striker will begin
to turn and change alignment.
1) Turn the cooking mode switch to OFF
and disconnect the electrical supply.
DOOR SEALING ADJUSTMENT
2) Remove the lead wires from the heating
element and check resistance (ohms).
See table below for proper values.
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.
3. Check for proper operation.
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.
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)
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VPX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
AMPS PER
ELEMENT
ELEVATION
(FT)
TEMPERATURE
(°F)
KW PER
ELEMENT
OHMS PER
ELEMENT
VOLTAGE
1 PH 3 PH
Sea Level
1,000
210
208
206
204
202
200
198
196
195
194
208
240
3
3
3
5
5
5
14.4
12.5
8.3
7.2
14.4
19.2
76.8
8.70
11.5
46.0
480
3.6
2,000
208
24.0
21.0
14.0
12.0
6.0
3,000
240
4,000
480
5,000
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.
NOTES:
6,000
7,000
8,000
9,000 or above
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.
TEMPERATURE CONTROL
CALIBRATION
To set the temperature control for optimum steamer
operation, the elevation above sea level for the
service location must first be determined.
1) Turn the temperature control dial
clockwise to increase temperature or
counterclockwise to decrease
temperature.
The elevation is used in conjunction with the
elevation table below, to determine the correct set
point temperature for the control.
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.
Page 13 of 20
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VPX SERIES STEAMER - ELECTRICAL OPERATION
ELECTRICAL OPERATION
COMPONENT FUNCTION
Buzzer . . . . . . . . . . . . . . . . . . Signals end of a "cook" cycle when cooking time expires.
Contactor . . . . . . . . . . . . . . . Supplies line voltage to heating element assembly.
Relay R1 . . . . . . . . . . . . . . . . Supplies power to temperature control.
Transformer . . . . . . . . . . . . . Provides 240V to the control circuit (480V only).
Heater Light (green) . . . . . . Indicates steamer is heating.
Low Water Light (red) . . . . . Indicates additional water is required in cooking compartment.
Cooking Mode Switch
(with pilot lights) . . . . . . . . . Supplies 240V to the control circuit. Two internal "pilot" lights indicate the
cooking mode selected. Timed mode is amber; Continuous mode is red.
Door Switch . . . . . . . . . . . . . Removes control circuit power from steamer when door is opened.
High Limit
Thermostat . . . . . . . . . . . . . . Protects steamer by removing control circuit power if the heating element
assembly temperature goes above 350°F (+/-15; 50°F differential).
Temperature Control . . . . . Monitors temperature probe and cycles power to heater contactor for steam
generation.
Standby Thermostat . . . . . . Maintains steamer at a standby temperature of 168°F (+5/-8) when "cook" timer
is off (timed mode only).
Timer . . . . . . . . . . . . . . . . . . . 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 . . . . . . . Senses cooking compartment temperature and sends a corresponding DC
voltage back to the temperature control (J-type thermocouple).
COMPONENT LOCATION
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VPX SERIES STEAMER - ELECTRICAL OPERATION
2) R1-3A & R1-3B return to N.O.
SEQUENCE OF OPERATION
position.
a. Temperature control de-
energized and internal relay
contacts open.
Wiring diagram 7264 will be used to explain the
electrical sequence of operation.
Timed Cooking Mode
a) Contactor de-energized and
power removed from heating
elements.
1. Conditions.
A. Steamer connected to correct voltage and
is properly grounded.
5. Set "cook" timer to desired time.
A. Timer contacts 1 & 3 close, timer motor is
energized and timing down begins.
B. Cooking mode switch (power) off.
C. High limit thermostat closed.
D. Standby thermostat closed.
NOTE: Additional time can be set or the "cook"
timer can be turned off throughout the cooking
cycle. If turned to off, steamer reverts to
standby temperature.
E. Temperature control is setup properly and
is ready to use.
6. Temperature reaches set point and the
temperature control’s internal relay contacts
open.
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).
A. Contactor de-energized and power is
removed from heating elements.
7. Steamer cycles on the temperature control until
"cook" time expires.
NOTE: At temperatures below 168°F, the steamer
is in a "pre-heat" state.
8.
Time expires on "cook" timer.
2. Select "timed" on the cooking mode switch.
A. Timer contacts 1 & 3 open, timer motor is
de-energized and timing stops.
A. Internal "pilot" light (top, amber) comes
on.
B. Timer contacts 1 & 4 close.
B. Internal "pilot" light (bottom, red) comes
on.
1) Buzzer energized and sounds.
NOTE: The buzzer continues to sound
until timer dial is set to off position or
additional time is set.
C. Relay "R1" energized.
1) R1-2A & R1-2B (both N.C.) open.
2) R1-3A & R1-3B (both N.O.) close.
9. Turn "cook" timer off.
3. Temperature control energized and evaluates
input from thermocouple.
A. Steamer reverts to standby temperature
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.
A. With temperature below set point, internal
relay contacts close.
1) Heater light (green) comes on.
NOTE: If water level becomes low during
cycling, high limit thermostat will open and low
water light (red) will come on.
2) Contactor energized and heating
elements are powered.
4. Temperature reaches 168°F and standby
Continuous Cooking Mode
thermostat opens.
1. Conditions.
A. Internal "pilot" light (top, amber) goes out.
A. Steamer connected to correct voltage and
is properly grounded.
NOTE: Steamer will maintain standby
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. Cooking mode switch (power) off.
C. High limit thermostat closed.
D. Standby thermostat closed.
B. Relay "R1" de-energized.
1) R1-2A & R1-2B return to N.C.
position.
E. Temperature control is setup properly and
is ready to use.
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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
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VPX SERIES STEAMER - ELECTRICAL OPERATION
WIRING DIAGRAMS
208-240V
Page 17 of 20
F25111 (March 2002)
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VPX SERIES STEAMER - ELECTRICAL OPERATION
480V
F25111 (March 2002)
Page 18 of 20
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VPX SERIES STEAMER - TROUBLESHOOTING
TROUBLESHOOTING
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TESTS OR
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.
SYMPTOM
Compartment leaks water around door.
POSSIBLE CAUSES
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.
1. Timer malfunction.
2. Contactor malfunction.
3. Temperature control malfunction (heater light on).
Steamer will not heat (heat light off).
1. Line voltage incorrect.
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.
Steamer will not heat (heat light on).
Timer motor does not run.
1. Line voltage incorrect.
2. Heating element malfunction.
3. Contactor malfunction.
1. Door open or door switch malfunction.
2. Relay R1 malfunction.
3. Timer inoperative.
Door not closing properly.
1. Door latch assembly.
2. Striker adjustment.
3. Steamer pan not inserted properly.
Door won’t open.
1. Latch won’t release. See "DOOR LATCH ADJUSTMENT" in
"SERVICE PROCEDURES AND ADJUSTMENTS".
Buzzer not operating.
1. Timer malfunction.
2. Buzzer malfunction.
Water spraying out of steam vent pipe
during a "cook" cycle.
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.
High water usage.
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. Steamer operating in "continuous" mode.
Excessive or inconsistent "cook" times.
1. Door left open between loads.
2. Temperature control calibration to low.
3. Heating element malfunction.
4. Standby thermostat malfunction.
Page 19 of 20
F25111 (March 2002)
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VPX SERIES STEAMER - CONDENSED SPARE PARTS LIST
CONDENSED SPARE PARTS LIST
VPX3 & VPX5
PART NUMBER
844385
844196
843811
853928
853956
853948
853957
851929
853270
853493
844422
853946
853945
853212
853213
DESCRIPTION
Door Gasket (VPX5)
NOTES
Door Gasket (VPX3)
Door Switch
Thermostat - Temperature Control
Thermostat - Standby
Thermocouple Sensor, J-Type
Fuse Block
Fuse, 1Amp 250v (208/240v)
Contactor (208/240v)
High Limit Thermostat
Power Switch (cooking mode switch)
Element assy. 208v 9kW
Element assy. 208v 15kW
Element assy. 240v 9kW
Element assy. 240v 15kW
411690-2
Timer, 60 min.
F25111 (March 2002)
Printed in U.S.A.
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