Bakers Pride VH-1620-E1 User manual

INSTALLATION
AND
OPERATING
INSTRUCTIONS
INTENDED FOR OTHER THAN HOUSEHOLD USE
Models: VH1620E, VHVA1620E, VH1828E & VHVA1828E
RETAIN THIS MANUAL FOR FUTURE REFERENCE
OVEN MUST BE KEPT CLEAR OF COMBUSTIBLES AT ALL TIMES
P/N U4173A 2/08
1
This equipment has been engineered to provide you with year-round dependable service when used
according to the instructions in this manual and standard commercial kitchen practices.
Initial heating of oven may generate smoke or fumes and must be done in a well ventilated area.
Overexposure to smoke or fumes may cause nausea or dizziness.
FOR YOUR SAFETY: Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance. !!
WARNING: Improper installation, adjustment, alteration, service or maintenance can
cause property damage, injury or death. Read the Installation, Operating and
Maintenance Instructions thoroughly before installing or servicing this equipment. !!
BAKERS PRIDE OVEN CO., INC.
30 Pine Street
New Rochelle, NY 10801
[phone] Phone [phone] US & Canada
[phone] Fax www.bakerspride.com Web Address
COUNTERTOP MODEL
ELECTRIC CONVEYOR OVENS
ANSI/NSF4

2
!WARNING: This symbol refers to a potential hazard or unsafe practice, which could result in
serious injury or death.
!
!
!DANGER: This symbol warns of imminent hazard which will result in serious injury or death.
!
!CAUTION: This symbol refers to a potential hazard or unsafe practice, which may result in minor or
moderate injury or product or property damage.
!
!NOTICE: This symbol refers to information that needs special attention or must be fully understood
even though not dangerous.
GENERAL INFORMATION
THIS MANUAL SHOULD BE RETAINED FOR FUTURE REFERENCE
Bakers Pride takes pride in the design and quality of our products. When used as intended and with proper
care and maintenance, you will experience years of reliable operation from this equipment. To ensure best
results, it is important that you carefully read and follow the instructions in this manual.
Installation and start-up should be performed by a qualified installer who has thoroughly read, understands
and follows these instructions.
If you have questions concerning the installation, operation, maintenance or service of this product, contact
our Technical Service Department at [phone].
SAFETY PRECAUTIONS
Before installing and operating this equipment be sure everyone involved in its operation are fully trained
and are aware of all precautions. Accidents and problems can result by a failure to follow fundamental rules
and precautions.
The following words and symbols, found in this manual, alert you to hazards to the operator, service
personnel or the equipment. The words are defined as follows:
!
CAUTION: These models are designed, built, and sold for commercial use. If these models are
positioned so the general public can use the equipment make sure that cautions, warnings, and
operating instructions are clearly posted near each unit so that anyone using the equipment will
use it correctly and not injure themselves or harm the equipment.
!
!
WARNING: Check the data plate on this unit before installation. Connect the unit only to the voltage
and frequency listed on the data plate. Connect only to 1 or 3 phase as listed on the data plate.
!
!
!WARNING: Electrical and grounding connections must comply with the applicable portions of the
national electrical code and/or other local electrical codes.
!
!WARNING: Disconnect device from electrical power supply and place a Tag Out-Lockout on the
power plug, indicating that you are working on the circuit.
WARNING: Install per the spacing requirements listed in the installation section of this manual. We
strongly recommend having a competent professional install the equipment. A licensed electrician
should make the electrical connections and connect power to the unit. Local codes should always
be used when connecting these units to electrical power. In the absence of local codes, use the
latest version of the National Electrical Code.
!
!
!
!
WARNING: This device should be safely and adequately grounded in accordance with local
codes, or in the absence of local codes, with the National Electrical code, ANSI/NFPA 70, Latest
Edition to protect the user from electrical shock. It requires a grounded system and a dedicated
circuit, protected by a fuse or circuit breaker of proper size and rating. Canadian installation must
comply with the Canadian Electrical Code, CSA C22.2, as applicable

3
!
!
WARNING: Never clean any electrical unit by immersing it in water. Turn off before cleaning
surface.
!
!
WARNING: An earthing cable must connect the appliance to all other units in the complete
installation and from there to an independent earth connection.
!
!
NOTICE: This product is intended for commercial use only. Not for household use.
!
!
WARNING: SHOCK HAZARD - De-energize all power to equipment before cleaning the
equipment.
!
!
NOTICE: The unit when installed, must be electrically grounded and comply with local codes, or in
the absence of local codes, with the national electrical code ANSI/NFPA70- latest edition.
Canadian installation must comply with CSA-STANDARD C.22.2 Number 0 M1982 General
Requirements-Canadian Electrical Code Part II, 109-M1981- Commercial Cooking Appliances.
!
!
NOTICE: Local codes regarding installation vary greatly from one area to another. The National
Fire Protection Association, Inc. states in its NFPA96 latest edition that local codes are “Authority
Having Jurisdiction” when it comes to requirements for installation of equipment. Therefore,
installation should comply with all local codes.
!
!
WARNING: A factory authorized agent should handle all maintenance and repair. Before doing any
maintenance or repair, contact Bakers Pride.
IMPORTANT FOR FUTURE REFERENCE
Please complete this information and retain this manual for the life of the equipment. For
Warranty Service and/or Parts, this information is required.
Model Number Serial Number Date Purchased
Notes:

TABLE OF CONTENTS
SECTION ITEM PAGE
1 Receiving 5
2 Location & Minimum Clearances 5
3 Installation 5
4 Stacking 6
5 Electrical Connections 6
6 System Check 8
7 Initial Start-Up 10
8 Shutdown 11
9 Special Features 11
10 Cleaning 12
11 Operator Maintenance 13
12 Rating Plate 14
13 Conveyor Removal 15
14 Conveyor Installation 15
15 Conveyor Belt Speed Calibration 16
16 Troubleshooting Guide 18
17 Temperature Control Conversion Chart 23
18 Solid State Relay Identification 24
19 Electrical Schematics & Wiring Diagrams 26
A. VHVA1620E Schematic, 208, 220 or 240VAC, 1 Phase 26
B. VHVA 1620E Wiring Diagram, 208, 220 or 240VAC, 1 Phase 27
C. VHVA1620E Schematic, 208, 220 or 240VAC, 3 Phase 28
D. VHVA 1620E Wiring Diagram, 208, 220 or 240VAC, 3 Phase 29
E. VH 1620E Schematic, 208, 220 or 240VAC, 1 Phase 30
F. VH 1620E Wiring Diagram, 208, 220 or 240VAC, 1 Phase 31
G. VH 1620E Schematic, 208, 220 or 240VAC, 3 Phase 32
H. VH 1620E Wiring Diagram, 208, 220 or 240VAC, 3 Phase 33
I. VHVA 1828E Schematic, 208, 220, or 240, 1 Phase 34
J. VHVA 1828E Wiring Diagram, 208, 220, or 240, 1 Phase 35
K. VHVA 1828E Schematic, 208, 220, or 240, 3 Phase 36
L. VHVA 1828E Wiring Diagram, 208, 220, or 240, 3 Phase 37
M. VH 1828E Schematic, 208, 220, or 240, 1 Phase 38
N. VH 1828E Wiring Diagram, 208, 220, or 240, 1 Phase 39
O. VH 1828E Schematic, 208, 220, or 240, 3 Phase 40
P. VH 1828E Wiring Diagram, 208, 220, or 240, 3 Phase 41
20 Parts Lists & Exploded Views 42
A. External Covers 42
B. Conveyor Assembly 42
C. Blower Motor Cover Assembly 43
D. Blower Assembly 43
E. VH Series Only 43
F. Plenum “Finger” Assembly 43
G. Main Power Control Box 44
H. Electric Control Box 45
I. Cool Down Thermostat, Elements, Switch & Probe 46
21 Warranty 47
4

5
3. INSTALLATION
Place the conveyor oven and parts as close to the area of final installation before uncrating. Your conveyor
oven is packed sitting on its bottom. Leave it this way until unpacked. The pallet may be left under the
conveyor oven for convenience in further handling. Unpack carefully to avoid damage to the unit. If
concealed damage is discovered, follow the instructions detailed in Section 1 above.
DO NOT LIFT EXCESSIVE WEIGHT
A. Legs are shipped unattached. Make sure each leg is attached and tightened before placing the
conveyor oven in place. Each leg is adjustable to accommodate variations in the mounting surface.
B. Using sufficient help (2 or more people), lift the conveyor oven upward and place on the countertop
surface. Lift the conveyor oven by gripping the bottom of the unit. THE FOLLOWING ITEMS ARE
NOT TO BE USED AS LIFTING "HANDLES": Side-mounted control boxes (2), removable front door
(with handles), the conveyor belt assembly, the rear fan housing assembly.
C. THE CONVEYOR BELT ASSEMBLY IS MOUNTED BACKWARDS FOR SHIPPING. THE
CONVEYOR BELT ASSEMBLY MUST BE REMOVED AND REVERSED PRIOR TO OPERATION.
See Section 6a, b for further instructions.
D. Position the conveyor oven in its final location, maintaining the minimum clearances specified in
Section 2 above.
I. INSTALLATION INSTRUCTIONS
VH1620E 6.4 1 or 3
VHVA1620E 6.4 1 or 3
VH1828E 12.4 1 or 3
VHVA1828E 12.4 1 or 3
1. RECEIVING
Read the notice on the outside carton regarding damage in transit. "CONCEALED DAMAGE", damage
discovered after opening the crate(s), MUST be reported immediately to the carrier. The carrier will perform
an inspection of the damage and furnish forms for the consignee's claim against the carrier. Retain ALL
packaging material - including outer carton, until the inspection has been completed.
Proper and secure storage facilities should be arranged for the conveyor oven(s) if necessary to protect it
from outdoor or damp conditions at all times prior to installation.
2. LOCATION AND MINIMUM CLEARANCES
Adequate air space must be provided for the proper venting of the rear exhaust air and provision made for
venting of cooking vapors. The Conveyor Oven must be installed in a well-ventilated area.
NOTE: Attached rear rubber bumpers must not be removed and can contact a rear wall if present.
Conveyor Ovens can be installed with "ZERO" clearances (back and sides) from combustible and non-
combustible materials. (Rear rubber bumpers are the “Zero” clearance points on the back of the unit.) S e e
rating plate attached to the control box door panel.
The Conveyor Oven is intended for countertop mounting if mounted on the 4" legs provided. The Oven is
NOT approved for mounting on any floor. Keep the area around your conveyor oven free and clear of all
combustible materials.
MODELS COVERED TOTAL KW PHASE

6
!
!CAUTION: Normal cooking operations may result in the production of smoke or fumes and may
cause nausea and dizziness. Be sure the oven is placed in a well-ventilated area.
E. Remove all loose parts and packages from the interior of the conveyor oven. The conveyor oven has
(4) air-directing "plenum fingers" in the interior cooking chamber. Check these items for proper
mounting. For further information on removal and mounting of interior panels, see Section 10,
cleaning.
4. STACKING
5. ELECTRICAL CONNECTIONS
General Instructions
a) Only use copper conductor wires rated at 90°C suitably sized for the electric current drawn.
d) Make sure the electrical supply corresponds with that specified on the rating plate.
e) Only a licensed electrician should make the electrical connections.
f) Proper connections are shown on the wiring diagrams as well as the rating plate.
g) Wiring diagrams are located in the control box containing the Main Switch (green rocker).
h) When installed, the unit must be electrically grounded in accordance with the local codes and/or the
latest edition of the national Electrical Code ANSI/NFPA No. 70 in the USA or Canadian Electrical
Code, CSA Standard C22.1, Part 1 in Canada.
b) Dual Air Model 1828E ovens are constructed for permanent connections - no power cord is supplied.
c) Dual Air Model 1620E ovens are supplied with a flexible power cord and plug.
Your conveyor oven(s) can be
stacked up to (3) high. Each unit is
built exactly the same, so it does not
matter in which order they are
stacked. For stacking of (2) units,
remove the legs from the second
(upper) unit prior to mounting on top
of the bottom unit. For stacking of (3)
units, it is preferable to use a
"stacking kit", which allows all
conveyor ovens to be supported by
an external framework, such as a
table, with each conveyor oven
having all legs removed.
"CAUTION: If you use a multiple stack
assembly, remember that each oven has
its own power disconnect. Make sure
ALL main switches are OFF before any
cleaning or maintenance is performed.”
1. Remove two bottom screws from the top oven rear panel.
2. Remove two top screws from the bottom oven rear panel.
3. Install the right and left stacking brackets as shown in above diagram.
4. Reinstall the four removed screws.
When
stacking,
remove
legs from
upper unit.
When stacking,
align “Dimpled
Foot” of upper
unit into
matching
“Dimple” of
bottom unit.
Use
Stacking
Brackets
to secure
ovens
together.
EACH CONVEYOR OVEN REQUIRES A SEPARATE CONNECTION
200-208 1 31 31 N/A 200-208 1 60 60 N/A
220 1 29 29 N/A 220 1 56 56 N/A
230 1 28 28 N/A 230 1 54 54 N/A
240 1 27 27 N/A 240 1 52 52 N/A
200-208 3 14 21 19 200-208 3 27 40 38
220 3 13 18 17 220 3 25 38 36
230 3 12 17 16 230 3 24 36 34
240 3 12 18 17 240 3 23 35 33
VH-, VHVA1620E: POWER SUPPLY (EACH) 6.4 KW/Hr VH-, VHVA1828E: POWER SUPPLY (EACH) 12.4 KW/Hr
Volts Phase L1 L2 L3 Volts Phase L1 L2 L3

Field Connections
a) Remove the cover from the Power Distribution Box Panel (under the control box on right side when
facing front of unit).
b) Locate the 4-pole Power Distribution Terminal Block mounted in the Power Distribution Box.
c) Install the proper strain relief for the PERMANENT CONNECTION utilizing the knock-out hole
provided. The strain relief should be securely fastened.
d) Supply the proper conduit to the conveyor oven and connect through the strain relief. Connect
properly-sized, copper-only conductor wires (rated 90°C) to the Power Distribution Terminal Block in
accordance with the schematic shown on the rating plate, as well as the wiring diagram provided.
NOTE: For three-phase connections, if any “High Voltage Leg” conductor is present, it MUST be
mounted to L3 ONLY. Replace the cover and fasten securely with removed screws.
NOTE: VERIFY THAT INPUT POWER MATCHES THE OVEN POWER REQUIREMENTS STATED
ON THE RATING PLATE, WHICH IS LOCATED ON THE POWER CONTROL BOX.
IF INPUT VOLTAGE DOES NOT MATCH OVEN VOLTAGE REQUIREMENTS, THE CORRECT
CONVEYOR OVEN MUST BE INSTALLED. THE CONVEYOR OVEN CANNOT BE MODIFIED IN THE
FIELD TO MATCH INPUT POWER.
CAUTION: FOR 3 PHASE UNITS ONLY: VERIFY VOLTAGE OF EACH LEG. IF ANY LEG HAS A
VOLTAGE GREATER THAN 240V THIS LEG MUST BE CONNECTED TO L-3 ON THE POWER
DISTRIBUTION BLOCK.
FOR DUAL AIR MODELS VH1620E, VHVA1620E:
These units are supplied with a flexible power cord, according to the specification placed with the
original order, which specified either single-phase or three-phase operation. No internal field
connection is necessary. All internal connections are complete. Connect the power cord to the
proper power receptacle. (see diagram below).
Note: If a different power cord is required than supplied, the correct power cord must be obtained
from a factory authorized service agent. Only an authorized service agent is to replace a power
cord.
FOR DUAL AIR MODELS VH1828E, VHVA1828E:
7
G
L3
L2
L1
G4
R (BROWN)
L2
L2
L2
5
E (BROWN)
4
A
FACTORY WIRING
TO INTERNAL CIRCUITS
FIELD WIRING
SERVICE CONNECTIONS
SINGLE-PHASE CONNECTION
G
L3
L2
L1
G4
R (BROWN)
L2
L2
L2
5
E (BROWN)
4
A
FIELD WIRING
SERVICE CONNECTIONS
FACTORY WIRING
TO INTERNAL CIRCUITS
THREE PHASE CONNECTION
NEMA SPECS.
1620E 3 PHASE1620E 1 PHASE
6-50P L15-30P

8
6. SYSTEM CHECK
a) Insure that the conveyor belt assembly is installed correctly, with the drive-shaft pin fitting firmly into
the coupling that protrudes from the Power Control Box gearmotor output shaft. Visually check that
the belt is flat and parallel to the countertopsurface. If the belt is not parallel to the countertop, it may
be necessary to re-align the gearmotor output shaft to the conveyor belt drive shaft pin. Follow this
procedure:
1.
2. Re-aligningthe coupling / driven-shaft pin requires openingthe Power Control Box door.
3. Insert a hex-head nut-driver tool to loosenthe (4) screws that fastenthe gearmotor to the box
sidepanel.
4. Re-align the coupling to the conveyor belt drive shaft pin. If this is done properly, the driven-
shaft pin willfit snuggly into the slot of the gearmotor coupling.
5. When alignment is correct, re-tighten the (4) screws at the gearmotor before closing the
door.
The conveyor belt is capable of traveling either Left-to-Right (standard), or Right-to-Left (optional).
Direction of travel is determined by looking at the conveyor oven from the front of the unit. Direction
of travel is controlled by a Reversing Switch that is located inside the control box containing the
gearmotor. If the direction of travel needs to be reversed,follow this procedure:
1.
2. Reversingtheconveyorbeltrequiresopening the Power Control Box door.
3. Locate a small rocker switch mounted just inside the control box, either black or orange in
color. Two wires are connected to it.
4. Change the switch position to the oppositesetting. No other changes are necessary.
5. Closeandsecurelyfastenthedoor.
6. Re-connect power to the unit.
b)
NOTE: OTHERWISE, FATAL DAMAGE WILL OCCUR TO THE GEARMOTOR,
CAUSING THE CONVEYOR BELT TO STOP MOVING. THE GEARMOTOR WILL NEED TO BE
REPLACED DUE TO INTERNALSTRUCTURALDAMAGE.
DISCONNECT THE POWER SUPPLY BEFORE SERVICING COMPONENTS INSIDE
EITHER OF THE CONTROL BOXES. SERIOUS INJURY, INCLUDING DEATH, MAY
OCCUR IF CONTACT IS MADE TO INCOMING POWER.
CHANGE THE REVERSING SWITCH ONLY WHEN POWER IS DIS-CONNECTED TO
THE CONVEYOR OVEN.
DISCONNECT THE POWER SUPPLY BEFORE SERVICING COMPONENTS INSIDE
EITHER OF THE CONTROL BOXES. SERIOUS INJURY, INCLUDING DEATH, MAY
OCCUR IF CONTACT IS MADE TO INCOMING POWER.
CONVEYOR BELT
FITS INTO UNIT
FROM FRONT
DRIVE SHAFT
PIN ALIGNS
WITH COUPLING
OF GEARMOTOR
CRUMB PANS MOUNT
IN CONVEYOR FRAME
HINGED
FRONT DOOR

Remove the front door and verify the proper orientation of the upper air return shield. c) The plenum
fingers are identical,so any finger can be mounted in any location.
d) Secure the (4) outer side panels to the main frame assembly using the ¼-turn fasteners that are
attached to these panels. Mount these side panels AFTER the conveyor has been properly
installed. (See above). Adjust the outer baffles UP / DOWN until they are in the correct position to
allow product to enter and exit with minimal vertical clearance. This will reduce the amount of heat
lost out the sides of the cook chamber.
9
REMOVABLE
PLENUM "FINGERS"
ASSEMBLY
ALL FOUR IDENTICAL
UPPER AIR
RETURN SHIELD
LOWER AIR
RETURN SHIELD
ASSEMBLY
INTERNAL FIXED
AIR PLENUM
ASSEMBLIES
END SLOTS TOWARDS
ADJUSTABLE BAFFLE
1/4-TURN FASTENERS
(2) TOP & (2) BOTTOM
( CAPTIVE TO COVER )
LOWER COVER
(LEFTSIDE)
HANGER PINS
(ATTACHEDTO
UPPER COVER )
UPPER COVER
( RIGHT SIDE )
LOWER COVER
( RIGHT SIDE )
UPPER COVER
(LEFTSIDE)
ADJUSTABLE
BAFFLE
HINGED
FRONT DOOR
HINGED DOOR

10
7. INITIAL STARTUP
a) Focus on the angled Electric Control Box containing the Main Switch (GREEN rocker type, lighted).
The VHVA-Series oven is shown, which contains (5) adjustable knobs for blowers, temperature
controls, and conveyor belt speed. VH-Series ovens only have (3) adjustable knobs that control
temperature and conveyor belt speed. Two indicator lights are mounted to show when HEAT is
being added to the system.
1) Flip ON the Main Switch. The switch should light up when ON ( ), and be dark when
OFF( ). Normal warm-up time is 20 -30 minutes for maximum temperature. Lower
temperaturesettingswill take less time.
2)
3) Turn the Air Velocity Speed Controls to MAX (full Clockwise rotation) and listen for the
air velocity speed to increase.
4) Set the Temperature Controls to MAX (full Clockwise rotation). The Indicator Lights will
illuminate because there is not sufficient heat in the oven. The lights tell you that the heaters
are ON.
7) As you become familiar with the oven, you will set the Top and Bottom Temperature Controls
to different settings, according to your cooking requirements. As the oven temperatures
vary, the Indicator Lights will turn ON and OFF as the heaters respond to the cooking
process.
8
I
O
IF THE MAIN SWITCH IS TURNED OFF DURING INITIAL START-UP, LEAVE UNIT OFF
FOR AT LEAST 15 SECONDS TO ALLOW THE AIR VELOCITY CONTROLS TO RESET.
TOGGLING THE SWITCH RAPIDLY (ON/OFF) WILL STALL THE BLOWER MOTORS
AND ALLOW THE HEATERS TO COME ON EVEN THOUGH NO AIR WILL BE MOVING.
THISCANDAMAGETHEUNIT.
5) Reduce the blower speed by turning the knob half-way (Counter-clockwise, until indicator
mark on the knob is pointingstraight UP).
6) Turn the temperature control knobs to 350°F. As each chamber (upper and lower) reach this
temperature, the indicator lights will cycle ON and OFF, verifying that the heaters are
operating properly in responseto heat demand.
) Gradually turn the conveyor belt control Counter-clockwise and verify that the conveyor belt
moves faster and faster. Repeat this process, turning the knob Clockwise, verifying that the
conveyorbeltmovesslower.
NOTE: AT SPEED SETTINGS ABOVE 10 (10-minute cook time), IT MAY BE HARD TO TELL THE BELT
IS MOVING. PLACEAPAN ON THE BELTTO OBSERVETHAT ITMOVES INTOTHE COOK CHAMBER.
ELECTRIC CONTROLBOX
BOTTOM AIR VELOCITY SPEED
CONTROL CW=FASTER
CONVEYOR BELT SPEED
CONTROL CW=SLOWER
TOPAIR VELOCITYSPEED
CONTROL CW=FASTER
TOP TEMPERATURE READY
INDICATOR LIGHT (HEAT)
MAIN SWITCH ON (I) OFF (0)
LOWER TEMPERATURE
CONTROL CW=HOTTER
BOTTOM TEMPERATURE READY
INDICATOR LIGHT (HEAT)
UPPER TEMPERATURE
CONTROL CW=HOTTER

8. SHUTDOWN
9. SPECIAL FEATURES
The conveyor oven is supplied with a special   that helps cool the oven quickly
once the unit has been shut OFF. This feature performs the following functions when the Main Switch is
turned OFF at the end of the day:
a) The blowerskeep running to re-circulate air throughthe air chambers
b) TheheatersshutOFF.
c) The conveyor belt stops moving.
d) Once the oven has cooled down to a factory pre-set temperature, the blowers shut OFF. The
oven is now completelyOFF.
Your new conveyor oven has been built with numerous enhancements to add flexibility and simplicity to
your cooking operation. The conveyor ovens are built in two versions:
Thefollowingspecialfeatures :
A. INDEPENDENT TOP AND BOTTOM HEAT. Different temperature settings can be set for
bothtopand bottomheatzones.
B. VARIABLE-SPEEDCONVEYORBELT
C. FIELD-REVERSIBLECONVEYORBELTTRAVEL
D. FRONT-REMOVABLE CONVEYOR BELT. No need to slide the belt assembly out the side.
E. INDEPENDENTTOPAND BOTTOM OUTER SIDE COVERS. Makes it possible to remove
conveyorbeltfromthefront.
F. SYMMETRICAL OUTER COVERS (DUAL AIR 1828E ONLY). Top and bottom outer side
coverscanmountoneitherside.
G. EASE IN CLEANING. This is accomplished by easily removable components for access to
the cook chamber, air plenum fingers, and conveyorbelt assembly.
The unithasthis additionalfeature.
VARIABLE-SPEED TOP AND BOTTOM AIR VELOCITY. This allows for maximum flexibility in
controlling the cookingenvironment, as some food products require less topair than others.
COOL-DOWN CIRCUIT
NOTE: This pre-set temperatureis not adjustable.
NOTE: TO ACCELERATE THE COOLING OF THE OVEN, OPEN THE FRONT DOOR TO ALLOW
COOLERAIR INTO THE SYSTEM.
NOTE: IF THE MAIN SWITCH IS TURNED BACK ON WHILE THE UNIT IS COOLING DOWN, THE
HEATERS AND CONVEYOR BELT WILL RE-ENGAGE TO BEGIN STANDARD COOKING
OPERATION. THIS IS NORMAL AND WILL NOT DAMAGE THE OVEN. HOWEVER, THE UNIT WILL
NEVER GET HOT ENOUGHTO COOK IF THE FRONTDOOR IS OPEN.
VARIABLE HEAT/VARIABLE AIR
VARIABLE HEAT/FIXED AIR
VARIABLE HEAT/VARIABLEAIR
ARE FOUND IN BOTH VERSIONS
11

10. CLEANING
CAUTION: THE CONVEYOR OVEN CONTAINS ELECTRICAL COMPONENTS. TURN OFF THE OVEN
ANDDISCONNECTTHE POWER BEFORE CLEANINGBEGINS.
DONOTCLEANTHECONVEYOROVEN WITHAWATER JET.
Rinse with a MOIST, NOT SOAKING, cloth.
CAUTION: DO NOT USE OVEN CLEANERS, CAUSTIC SOLUTIONS OR MECHANICAL MEANS
BECAUSE THESE WILL DAMAGE THEALUMINIZED SURFACES
NOTE: USE CARE IF CLEANING THE CONVEYOR BELT WHILE IT IS STILL MOUNTED IN
THE OVEN. EXCESSIVE FORCE MAY PRODUCE AN OVERLOAD CONDITION THAT
COULD DAMAGE THE GEARMOTOR AND CAUSE THE OVEN TO BE RENDERED UN-
USABLE.
Use only a damp cloth.
WEEKLY CLEANING:
Oven Exterior: CLEAN ONLY WHEN THE OVEN IS COLD.
Oven Interior: CLEAN ONLY WHEN THE OVEN IS COLD.
ConveyorBeltAssembly
Plenum Fingers
1. Removecrumbpans.
2. Removeplenumfingerassembliesand disassemblefor cleaning.
Standard construction of the exterior is
of stainlesssteel.
Deposits of baked-on splatter and grease, or discoloration may be removed by using any commercial
cleaner recommended for stainless steel. Always rub with the grains and apply very light pressure.
Standard construction of the interior
(cook chamber) is of aluminizedsteel, and requires care not to over-cleanand scratch the surface.
. Use only the detergent solutions
and cleaners that meet national and/or local codes. Clean the walls of the cook chamber with a mild
soapandwatersolution.
To clean the interior of the conveyor oven, it is necessary to remove the front door, the (4) outer sides
panels,the conveyor belt assembly, and the (4) air plenumfingers. (See page9.)
1. CONVEYOR BELT STILL MOUNTED IN OVEN:
Using a plastic abrasive pad, wipe the conveyor belt in a back-and-forth motion to remove
baked-on product. Wipe clean with a hot, damp cloth.
2. CONVEYOR BELT REMOVED FROM OVEN:
Using a plastic abrasive pad, wipe the conveyor belt in a back-and-forth motion to remove
baked-on product. Wipe clean with a hot, damp cloth.
NOTE: IT IS NOT NECESSARY TO REMOVE THE BELT FROM THE FRAME ASSEMBLY FOR
CLEANING.
3. Check the belt links for any sign of damage. If any links are bent, use a needle-nose pliers to
repair priorto re-installation into the unit.
The conveyor oven contains (4) plenum fingers that direct air onto the product surface while
cooking. This3-pieceassemblycomesapart for cleaning, as shown below:
Removeconveyorbeltassembly.
12

The Outer Perforated panel is locked into place through a friction fit to the Main panel. This method
of fastening also captures the Inner panel, holding it in place. The Outer panel slides off the Main
panel, exposing the perforated Inner panel. The Inner panel is symmetrical in design, and may be
placed in either direction, as long as the outer flanges are pointing as shown in the figure
above.
The Inner and Outer panels are made of stainless steel, and therefore may be exposed to strong
cleaners to remove baked-on grease, etc. Overnight soaking in a hot cleaning solution will improve
thecleaningprocess.
The Main panel is made of aluminized steel like the main cook chamber, and thus requires the same
level of care to retain its integrity. Follow the same precautions as mentioned above for the main
cookchamber.
UPWARD
11. OPERATOR MAINTENANCE
WARNING DANGER DISCONNECT THE POWER SUPPLY BEFORE SERVICING OR CLEANING
THE OVEN. SERIOUS INJURY, INCLUDING DEATH, MAY OCCUR IF CONTACT IS MADE WITH
INCOMINGPOWER.
:
During normal operationof the oven, lubrication is not required.
To achieve maximum efficiency, keep the oven clean. How you maintain your oven will determine how long
it lasts.
If the oven fails to operate, performthe following inspections BEFOREcalling an authorized service agent:
13
AIR PLENUM FINGER ASSEMBLY
Although symmetrical
in design, inner panel
must have flanges
facing up as shown
Inner Perforated
Screen
(Stainless Steel)
Outer Perforated
Panel
(Stainless Steel)
Main Panel
(Aluminized Steel)

1. Check to see if the main circuitbreaker is ON at the breaker panel.
2. Check the (2) 5-amp fuses located in the bottom of the Power Control Box
3. Check that the Main Switch is ON. If operating properly, the rocker switch will be lighted
whenON.
4. Check the setting of the temperature control thermostats (knobs). If operating properly, they
will activate the amber indicator lights as you turn the knobs back and forth, calling for heat. It
is very unlikely that the lightwill burn out.
5. If there is no air blowing, checkthe following:
: the unit by turning the Main Switch OFF
for at east15 seconds and then turning it back ON. This resets the blower speed
controls. If this is not successful, turn off the wall circuit breaker for one minute and
then turn it on again.
: Observing the at the beginning of this
section, open the Power Control Box and locate the overload relay (above
gearmotor). . Try the Main Switch again.
1. NOTE:, meaning that if one or both of the blower motors get jammed, the
overload relay shuts the motor(s) OFF if there is excessive current going to
the motor(s), or if excessive heat builds up in the overload relay due to an
overload condition. Because it takes time for the relay to cool down, do not
assume that there is another problem IF pushing the RESET button doesn't
accomplish the task Both settings,
, must be correct forproper operation.
If the conveyor belt does not move, check to see that the coupling setscrew is tight on the
gearmotoroutputshaft.
If the oven still does not operate, turn OFF the Main Switch and disconnect the power supply to the
unit (if possible). Contact the factory, factory representative, or an authorized serviceagency.
.
.
i. RESET
ii.
PUSH IN THE RESET BUTTON
The Overload Relay is both a current limiting and a thermal
device
RESET button pushed IN & overload
notoverheated
6.
CAUTION
IF FUSES ARE BAD, REPLACE ONLY WITH IDENTICAL FUSES. DO NOT
SUBSTITUTE HIGHER VALUE FUSES, AS THIS MAY NULLIFY NEEDED PROTECTION
FORTHEINTERNALELECTRICALCOMPONENTS.
DUALAIR MODELVHVA-SERIES
DUAL AIR MODEL VH-SERIES WARNING
ALL SERVICING SHOULD BE PERFORMED ONLY BY A FACTORY AUTHORIZED SERVICE
TECHNICIANORAGENT
:
12. RATING PLATE
A copy of the rating plate is shown here for reference.
MODEL VH-SERIES MODEL VHVA-SERIES
14

13. CONVEYOR REMOVAL
14. CONVEYOR INSTALLATION
Extensive Engineering went into designing your oven for ease of cleaning. One SPECIAL
FEATURE is the ability to remove the conveyor belt assembly straight out the font of the oven.
Followthisprocedure,usingthediagramprovided:(See drawing below)
a) Remove any extension trays present, rotating them upwards to clear the conveyor frame.
Flanges on the trays hook aroundthe ends of the frame.
b) Removethetwocrumbpans.
c) Remove the upper outer side covers, which have the adjustable baffles attached with pins.
The covers are held in place with hand-twist fasteners. Turn these fasteners 90°
counterclockwiseto loosen, and 90° clockwise to tighten.
d) It is not necessary to remove the outer lowerside covers.
On Dual Air Models VH-, VHVA Series ovens, the outer upper and lower covers
are symmetrical, and canbe mounted on either side of the oven.
e) Openthefronthingeddoor.
f) Carefully supporting both right and left sides of the conveyor, lift the front edge slightly and
pull towards you, watchingas the drive shaft pulls out of the gearmotorcoupling.
Installing the conveyorbelt assembly is done in exact reverse order to its removal.The MOST IMPORTANT
POINT is to properly align the drive shaft pin with the gearmotor coupling. If the drive shaft pin must be
wedged into place for installation, the coupling location needs to be adjusted. See Section 6a for this
procedure.
NOTE: 1828E
DO NOT FORCE THE DRIVEPIN INTO THE COUPLINGIF THEY DO NOTALIGN.
15
IF EXTENSION TRAYS ARE
PRESENT, ROTATE THEM
UPWARDS TO REMOVE FROM
CONVEYOR FRAME
IF EXTENSION TRAYS ARE
PRESENT, ROTATE THEM
UPWARDS TO REMOVE FROM
CONVEYOR FRAME
UPPER OUTER SIDE
COVER WITH
ADJUSTABLE BAFFLE
UPPER OUTER SIDE
COVER WITH
ADJUSTABLE
BAFFLE

15. CONVEYOR BELT SPEED CALIBRATION
The conveyor belt requires calibration to properly align the speed control knob on the Electric Control Box.
Calibration is done by timing the belt as it passes between two timing marks located on the conveyor frame.
This method will work regardless of belt travel direction. Follow the instructions below.
Idler Shaft Belt Travel
(Standard)
Timing Marks
on Conveyor Frame
Conveyor Frame 5” (1620E), or 7” (1828E)
A. Remove the adjustment knob of the conveyor belt speed control (see page 10) using a small,
standard screwdriver to loosen the setscrew.
B. Locate the two timing marks as shown above. For the Dual Air VH-, VHVA1620E series, the marks
are 5 inches apart; for the Dual Air VH-, VHVA1828E the marks are 7 inches apart. IF the timing
marks are NOT present, use a black marking pen to mark the frame in the same manner.
C. These distances represent exactly ¼ of the distance of the cook chamber: ¼ x 20” cook chamber
(DualAir 1620E) = 5”; ¼ x 28” cook chamber (Dual Air 1828E) = 7”.
D. With this 1:4 ratio, it is possible to calibrate the belt speed. For example:
1. For a cook time of 1 minute, the time required to pass between timing marks would be: 60
seconds / 4 = 15 seconds. If the belt passes from one mark to the next in 15 seconds, this is
exactly the same as a 1-minute cook time.
2. For a cook time of 6 minutes, the required time to pass between timing marks would be: 6
minutes x 60 seconds / 4. This equals 360 seconds / 4 = 90 seconds between marks. The
belt needs to take 90 seconds (1-1/2 minutes) to move from one mark to the next to equal a
6-minute cook time.
E. Using a black marking pen, mark any belt link near the outer edge. Using a stopwatch, check the
time it takes for this link to move between the timing marks. Repeat this procedure several times
until the distance is traveled in 90 seconds (recommended calibration interval), which equals a 6-
minute cook time.
F. Now that the belt is moving at this calibrated speed, CAREFULLY re-mount the adjustment knob
onto the belt conveyor speed control shaft, and tighten the setscrew so that the KNOB indicating
mark is pointing at the number “6” on the surrounding label.
G. The conveyor belt is now calibrated for ALL ranges as indicated on the label. The label numbers are
COOK TIME in MINUTES. Simply point the knob indicating line to the desired cook time.
The label COOK TIME marks are close approximates, and may vary slightly from actual
timing results using the method described.
H Cook/Bake Time is not the same as time of delivery. is the actual time required
for the first item, leading edge to trailing edge. is leading edge to leading
edge. For example, the for a 16” pizza with a 6 minute (using the
DualAir 1828 conveyor) is 9.4 minutes.
NOTE:
Time of Delivery
Cook/Bake Time
Time of Delivery Bake/Cook Time
16

17
Oven Capacity/Hour (OCH) =X
Bake Chamber Length X Bake Chamber Depth 60 Min/Hr
Product Diameter Bake Time
2
Example 1:
Dual Air Model 1620Bakers Pride , 6 Minute Pizza, 16” Pizza
Example 2:
Dual Air Model 1828Bakers Pride , 6 Minute Pizza, 16” Pizza
OCH = X = 12.5
(20 X 16)
16
2
60
6
OCH = X = 19.7
(28 X 18)
16
2
60
6
Bake Time
Leading Edge of Product
Time will be the same for any size product.
Time of Delivery
Trailing Edge of Product
Time of delivery will be different for
different sizes of products.
Time of Delivery (TOD) = X (Bake Chamber Length + Product Diameter)
Bakers Pride , 6 Minute Bake Time, 16” pizza (time required for the 1st item):
(TOD) = X (20 + 16) = 10.8 Minutes
Example 1:
Dual Air Model 1620
Bake Time
Bake Chamber Length
6 Minutes
20”
6 Minutes
28”
Example 2:
Dual Air Model 1828Bakers Pride , 6 Minute Bake Time, 16” pizza (time required for the 1st item):
(TOD) = X (28 + 16) = 9.4 Minutes
I. To calculate production capacity per conveyor, per hour use the following formula.

16. TROUBLESHOOTING GUIDE
18
THE PROBLEM THE CAUSE THE SOLUTION
Belt master link(s) missing, broken, or
installed incorrectly.
Conveyor belt installed backwards or
upside down
Oven doesn't start
Conveyor belt
doesn't move, or it
moves unevenly.
Unexpected speed
changes.
Drive sprockets worn out, missing, or mis-
aligned
Belt loose. Drive sprockets not engaging
belt links.
Drive coupling loose
Speed setting very high (long cook time)
Drive coupling missing
Conveyor gearmotor failed
Locate and re-install or replace
Replace sprockets or entire drive shaft
assembly. Tighten sprockets to shaft.
CAUTION: THE FOLLOWING TESTS
ARE PERFORMED WITH LIVE POWER
WITH CONTROL BOX OPEN. THESE
TESTS TO BE PERFORMED ONLY BY
1. Test by disconnecting conveyor belt. If
no shaft rotation or motor noise when
power applied, test power supply.
2. Test power supply input connections @
3. Remove cover from power supply
enclosure and verify integrity of internal
Drive shaft pin missing
Conveyor belt jammed
Check power distribution terminal block
below Power Control Box
If belt still too loose, remove one belt link.
Tighten conveyor belt using adjustable
tensioner at one end of belt frame.
Properly re-attach and tighten to
gearmotor output shaft
Remove belt assembly to identify
obstruction to belt movement. Remedy
problem. Straighten bent belt links
Tighten setscrew to gearmotor output
shaft (shaft is "flatted" for setscrew grip)
Align and engage shaft pin to slot in drive
coupling
Install master link(s) properly
Turn ON
Plug cord in (1620E only)
CAUTION: TURN OFF POWER , open
Power Control Box, and flip Reversing
Switch to opposite position.
Proper belt orientation is for outer belt
loops to be facing in oppositie direction of
travel, and the outer loops to be on top of
the trailing link.
Adjust speed to FAST to verify if knob is
tight and potentiometer working correctly
Verify that all sprockets are tight and
properly aligned with belt "segments".
Tighten setscrew in knob on pot shaft.
NOTE: Mark on knob should line up with
mark on label to indicate cook time in
minutes. This may require calibration of
belt movement using timing marks on
conveyor frame. For CALIBRATION, see
Section 15.
Conveyor drive shaft not engaged to
coupling
Main circuit breaker OFF
Power cord disconnected (1620E only)
Power connections broken
Conveyor belt running backwards
Speed knob loose
Blown fuse(s)
Main Switch broken
Replace fuse with identical type - 5 amp
Replace
Main Switch OFF Turn ON

19
Blower speed control(s) at minimum or low-
speed setting (model VHVA-Series only)
No sound or noise coming from blower(s)
Conveyor belt
doesn't move, or it
moves unevenly.
Unexpected speed
changes.
Blower motor(s) "jammed"
Blower motor(s) "stalled" (not running
when Main Switch ON)
If all previous tests verify power and
control to gearmotor, replace gearmotor.
4. Verify wire connectors from power
supply to gearmotor (2 wires
w/connectors). If power supply doesn't
5. Verify potentiomter connections to
gearmotor (3 wires w/connectors). If
speed doesn't change when knob is
turned, test with spare pot before replacing
original pot.
Remove source(s) of obstruction.
CAUTION: TURN OFF MAIN CIRCUIT
BREAKER BEFORE REACHING INTO
BLOWER WHEEL COMPARTMENT.
SERIOUS INJURY COULD RESULT
OTHERWISE!!
Turn speed knob(s) clockwise to increase
air flow
Turn both blower speed controls to
minimum, then adjust each one separately
to hear for sound changes which indicate
air movement. (model VHVA-Series only)
THE PROBLEM THE CAUSE THE SOLUTION
No air or not
enough air coming
from blower(s)
Verify correct rotation - counterclockwise
when standing in front of machine.
Remove the front door, the conveyor belt
assembly, and both upper and lower air
return shilelds. Turn the Main Switch ON
and OFF one time to start the blowers, and
observe the rotation as the blowers slow
down to stop. If rotation is incorrect, (three-
phase motors only), then two of the three
power wires need to be swapped @ the
terminal block to reverse direction of
rotation. Re-check with same method.
Blower(s) turning backwards.
(Applies to models VH-, VHVA Three-
phase units, and VHVA Single-phase
units. Does NOT apply to VH Single-
phase units.)
(Continued)
Conveyor gearmotor failed
(Continued)
Turn Main Switch OFF for at least 15
seconds, then turn it ON again. This
resets speed controls. If this doesnt help,
turn OFF Main Circuit Breaker for
, then turn it ON again.
1
Minute

20
THE PROBLEM THE CAUSE THE SOLUTION
No air or not
enough air coming
from blower(s)
(Continued)
7. If all previous tests are normal, then
blower motor has failed. Replace.
Blower motor(s) failed
ON, disconnect main power cord or circuit
breaker for 1 minute. If "FAULT" light
persists, and all previous tests show
normal, speed control can be tested in the
following manner: swap motor wires from
"good" speed control to "bad" control, and
see if blower motor works. If YES, then
"FAULTY" control is bad and needs
replacing. If NO, then "FAULTY" control is
OK, and motor may need replacing.
6. Test potentiometer by swapping "bad"
pot to "good" speed control. If motor then
works properly, pot is OK, and other speed
control needs testing. (model VHVA-Series
only).
Wire connections broken or loose between
potentiometer and speed control
at the header terminal on speed control
board.
4. One pot wire contains a 15K ohm
resistor at the pot body. Verify this solder
connection is good.
Blower speed control(s) failed 5. Blower(s) can stop if speed controls
have not been reset (model VHVA-Series
only). If yellow "FAULT" light on speed
control circuit board is ON, first turn OFF
main Switch for 15 seconds to rest
control(s). If yellow "FAULT" light remains
CAUTION: THE FOLLOWING TESTS 1-
4 ARE PERFORMED WITH LIVE POWER
WITH CONTROL BOX OPEN, OR REAR
MOTOR COVER REMOVED. THESE
TESTS TO BE PERFORMED ONLY BY
AN AUTHORIZED SERVICE AGENT.
1. Speed control wire connections are
labeled U, V, and W. Insure connectors
are tight.
2. Insure these (3) wires are tight on
terminal block located in blower motor
compartment.
3. Tighten wires from pot to speed control
Wire connections broken or loose between
blower motor(s) and terminal block.
Wire connections broken or loose between
speed controls and blower motor(s)
(model VHVA-Series only)