Wisco Industries 608 User manual

608 CONVECTION OVEN
CRISP, BROWN
AND HOT!
WISCO’S SUPER CONVECTION OVEN
PREPARES FOOD PERFECTLY!
WISCO INDUSTRIES, INC.
OREGON, WISCONSIN 53575-0010 • PHONE: [phone] • FAX: [phone]
39/03
FP140016
Certified to ISO 9001, 1994

CONTENTS
INTRODUCTION ............................................................................................................1
GENERAL ......................................................................................................................1
MODEL DESCRIPTION..................................................................................................1
Construction
SPECIFICATIONS ..........................................................................................................1
Dimensions
Electrical
OPERATING INSTRUCTIONS ......................................................................................2
Preparation
Location and Function of Controls
OPERATION (Baking Hints)..........................................................................................3
Preheat
Temperature
Time
Product
GENERAL MAINTENANCE ..........................................................................................3
Cleaning of Oven
TROUBLESHOOTING GUIDE........................................................................................4
608 SERVICE/REPAIR GUIDE (Service Technicians) ..........................................4–11
Outer Enclosure Removal
Timer
Power Switch
Lamp
Motor
Regulating Thermostat
Heating Element
Door Hinge & Latch
EXPLODED VIEW DRAWING......................................................................................12
COMPLETE PARTS LIST ............................................................................................12
WIRING DIAGRAM AND COMPONENTS LIST ..........................................................13
SUGGESTED TIMES AND TEMPERATURES ............................................................14
BAKING RECORDS ....................................................................................................15
LIMITED WARRANTY:
Manufacturer warrants this product to be free of defects in material and workmanship (except quartz
lamps) for 90 days from date of purchase. If your product becomes defective within this time period,
contact your Seller to arrange for repair or replacement as determined by Seller. EXCEPT FOR THIS
LIMITED WARRANTY, MANUFACTURER MAKES NO WARRANTIES EXPRESS OR IMPLIED AS TO
THE PRODUCT, INCLUDING BUT NOT LIMITEDTO ITS MERCHANTABILITY AND FITNESS FOR
ANY PARTICULAR PURPOSE. Repair or replacement of a defective product shall be purchaser’s sole
and exclusive remedy against Manufacturer.

1
INTRODUCTION
Congratulations on your recent selection of the Wisco 608 series convection oven.
Wisco Industries has a long tradition of producing top-quality dependable products
designed to provide years of reliable service.
GENERAL
The compact size of the 608 convection oven offers convenient fast food preparation
while meeting today’s demand for performance with economy. The unique airflow
prepares a wide range of bakery or fried products cooked evenly to a golden brown or
crispy finish.
As a safety precaution, we recommend all instructions and safety tips appearing in this
manual be reviewed prior to operation.
MODEL DESCRIPTION
CONSTRUCTION
Wisco’s 608 series convection oven is equipped with a 22-gauge stainless steel outer
enclosure.The front, back, and base are coated with a durable scratch resistant epoxy
base paint.
SPECIFICATIONS
DIMENSIONS
Exterior (Housing) Width: 25' Height: 13" Depth: 17"
Interior (Cavity) Width: 13" Height: 9 1/2" Depth: 13"
ELECTRICAL
This unit is designed to operate on 120 volts AC, single phase. It is equipped with a 6-
foot cord and plug.The 18 Amp unit requires a standard NEMA 5-20R receptacle rated
20 Amps.
ELECTRICAL RATING: 120 Volt AC, 60 Hz, 1720 Watt, 14.3 Amps: Model 608-1
120 Volt AC, 60 Hz, 2240 Watt, 18.6 Amps: Model 608
SHIPPING WEIGHT: 65 lbs. (boxed)

2
OPERATING INSTRUCTIONS
CAUTION: To prevent electrical shock, DO NOT apply power or try to operate the unit
until the following preparation is completed.
PREPARATION
Prior to operation, the four legs must be attached to the base of the unit.
NOTE: A minimum clearance of 1 inch must be maintained between the oven and
surrounding surfaces.
LOCATION AND FUNCTION OF CONTROLS
Figure 1. Control Panel
1) MAIN POWER SWITCH: Provides access to the power main and actuates the
blower motor directly.The red lamp within the switch indicates when the power is on.
2) REGULATING THERMOSTAT: Regulates the desired internal temperatures,
ranging from 65 to 500 degrees Fahrenheit.
3) INDICATOR LAMP: Indicates when the desired temperature has been reached.
The lamp illuminates when the heating element is in an active mode.
4) TIMER: The mechanical timer ranges from 0–30 minutes. A single chime signals
the completion of the baking cycle – it does not shut off the oven.When setting
the timer, turn past the 5-minute mark and then to the desired time if less than 5
minutes (optional timer configurations may apply).
4
3
2
1

3
OPERATION (Baking Hints)
PREHEAT
Always preheat the oven before baking or roasting.Turn the power switch ON and set
the thermostat to the desired temperature.The red indicator light will turn off when the
selected temperature has been reached. For frozen products, the preheat cycle should
be set 50˚F–75˚F above the suggested cooking temperatures, then reset to the
suggested temperatures when the product is loaded.
TEMPERATURE
Most products require lower temperatures than suggested for deck or range ovens. A
standard temperature reduction of 50˚F is recommended as a starting point. Actual
baking will vary pending product weight and consistency. If the edges of the product
are done and the center is still raw, or if there is extensive color variation, reduce the
thermostat setting by 15–25˚F until the desired results are achieved. Excessive
temperatures will not reduce baking time.
TIME
Convection ovens generally bake 25–40% faster than deck or range ovens, even
though lower temperatures are used.
PRODUCT
Load the oven from the bottom up, centering the pans on the racks.To ensure even
baking, equal amounts of the product should be used. Different amounts of the product
in different pans causes uneven baking.
GENERAL MAINTENANCE
Wisco ovens are designed to be as trouble and maintenance free as possible.
However, to maintain optimum performance, a regular cleaning schedule should be
observed.
CLEANING OF OVEN
INTERIOR: The stainless steel can be easily cleaned with mild detergent and hot
water on a daily basis. For heavier buildup, a standard “non” abrasive oven cleaner
should be used.
EXTERIOR: The stainless steel and painted exterior should be cleaned with a mild
detergent, glass cleaner, or substitute cleaner that is not abrasive. DO NOT allow
grease or dust particles to accumulate in the louvers. Adequate airflow is essential for
proper cooling of the internal components.
GLASS DOOR: Use only “non” abrasive cleaners and pads.

4
TROUBLESHOOTING GUIDE
When more than one possible cause is listed, check the components in the order
provided.The list is arranged from most probable cause to least.
PROBLEM CAUSE
No power to unit Check outlet connection
Check fuse at main circuit
Main power switch
Limiting thermostat
Uncontrollable temperature Regulating thermostat
No heat Regulating thermostat
Heating element
Limiting thermostat
Irregular time length Timer
No internal airflow Motor
Motor shuts down after Obstructing object near vent
running for short periods Air vents need cleaning

5
608 SERVICE/REPAIR GUIDE (Service Technicians)
NOTE: The service technician should brief him or herself with the instructions relating
to the component in question prior to working on this unit.
The unit has been designed to allow access and replacement of most electrical
components by simply removing the outer enclosure, with the exception of the
regulating thermostat, heating element, and high limit thermostat.
CAUTION: ALWAYS UNPLUGTHE UNIT PRIOR TO SERVICING.
OUTER ENCLOSURE REMOVAL
REQUIRED TOOLS: Phillips screwdriver
1) REMOVE OUTER ENCLOSURE: Extract the 8 screws on the bottom (4 per side),
13 screws on the back (not the 5 along the base), and loosen the 4 screws across
the top of the front control panel.With the oven facing you, remove the outer
enclosure by first lifting the left side out slightly and up, and then the right. Be sure to
flex the right side enough to allow the internal shroud to clear the cooling fan.
IMPORTANT ENCLOSURE REASSEMBLY NOTE: Check that the entire front flange
on the outer enclosure is between the primary and secondary front panels, not behind
both of them (see Figure 3).When tightening the 4 screws across the front control
panel, put pressure on the enclosure, keeping it flush against the panel.
Figure 2. Enclosure Flange
BLACK FRONT PANEL
SECONDARY PANEL
OUTER ENCLOSURE
SECONDARY PANEL
FRONT PANEL

6
TIMER
REQUIRED TOOLS: 1/2" wrench/driver
Phillips screwdriver
1) REMOVE OUTER ENCLOSURE: See Outer Enclosure Removal.
2) REMOVE TIMER KNOB: Knob is a push on/pull off press fit. Pull knob out straight
away from control panel.
3) REMOVE PAL NUT:Use the 1/2" wrench to remove the pal nut, timer dial, and
timer.
TIMER REPLACEMENT NOTE: The timer must be installed with the “TOP” stamp in
the upright position to function properly.
Reverse steps 1–3 to install timer and reassemble oven.
POWER SWITCH
REQUIRED TOOLS: Phillips screwdriver
1) Remove Outer Enclosure: See Outer Enclosure Removal.
2) REMOVE WIRES: The three wires use quick connect terminals that simply push
on/pull off. See Figure 4 for correct wiring of switch.
3) REMOVE POWER SWITCH: Panel mount style, depress finger tabs on top and
bottom of switch and push switch through opening in control panel.
Reverse steps 1–3 to install power switch and reassemble oven.
Figure 3. Power Switch
LEAD TO
TERMINAL BLOCK
(6) PRONG
TOP
POWER
INDICATOR
LIGHT
TOP
POWER CORD
LEAD
LEAD TO
TERMINAL BLOCK
(3) PRONG

7
INDICATOR LAMP
REQUIRED TOOLS: Phillips screwdriver
1) REMOVE OUTER ENCLOSURE: See Outer Enclosure Removal.
2) REMOVE WIRES: The two wires use quick connect terminals that simply push
on/pull off.These wires are interchangeable between the two terminals.
3) REMOVE LAMP: Panel mount style, depress finger tabs on each side of lamp
body and push through opening in control panel.
Reverse steps 1–3 to install lamp and reassemble oven.
MOTOR
REQUIRED TOOLS: Phillips screwdriver
3/8" driver w/extension
1/8" Allen wrench
3/32" Allen wrench
5/64" Allen wrench
1) REMOVE OUTER ENCLOSURE: See Outer Enclosure Removal.
2) REMOVE MOTOR MODULE ASSY: Disconnect the 2 black motor leads from the
terminal block. Use the 3/8" driver to remove the 8 hex nuts anchoring the motor
module to the heat module and remove as a complete unit.
3) REMOVE MOTOR FROM MOTOR MODULE INTHE FOLLOWING STEPS:
A. REMOVE BLOWER WHEEL: Use the 1/8" Allen wrench to loosen the set screw
in the blower wheel, then pull the wheel off the motor shaft.When replacing the
blower wheel, there should be roughly 1/8" clearance between the back of the
blower wheel and the shield.The set screw must be aligned on the flat of the
motor shaft when tightened.
B. REMOVE MOTOR: Use the 3/8" driver to remove the 4 10-32 hex nuts holding
motor to motor module.
C. REMOVE COOLING FANS: Major: Use the 3/32" Allen wrench to remove the
fan.When reinstalling the fan, the hub should be flush with the motor shaft end,
and the set screw aligned on the shaft should be flat when tightened. (Minor):
Use the 5/64" Allen wrench to remove the fan. When reinstalling the fan, it
should have 1/16"–1/8" clearance between the hub and the motor end case.
Reverse these steps to install the motor and reassemble the oven. Note: The motor is
installed so that wires come out of the bottom between the fan shrouds.

8
Figure 4. Motor Module Assembly
REGULATING THERMOSTAT
REQUIRED TOOLS: Phillips screwdriver
medium screwdriver
small screwdriver
1) REMOVE OUTER ENCLOSURE: (See Outer Enclosure REmoval).
2) REMOVE SUPPORT RACK: Remove the 2 finger screws right and left midway up
the front of the inner cavity. Flex the support rack around the finger screw heads
and bulb guard. Once the front of the rack has cleared the screws, gently flex the
rack into a parallelogram with the right side back and pull straight out.
3) FREE CAPILLARY BULB: Loosen the 2 finger screws holding the thermostat bulb
guard in place just enough to free the capillary bulb.
BLOWER WHEEL
MOTOR MODULE
FAN SHROUD
FAN BLADE (MINOR)
FAN BLADE (MAJOR)
SHIELD
MOTOR
FAN SHROUD

9
REGULATING THERMOSTAT (continued)
4) REMOVE BACK PANEL: Extract the 2 screws located off-center near the top and
bottom of the back panel, then extract the 5 screws along the base.This will allow
access to pass the capillary line through the back of the inner cavity.
5) REMOVE THERMOSTAT KNOB: Use the small screwdriver to loosen the knob set
screw and pull the knob straight off the thermostat shaft.
6) REMOVE THERMOSTAT: Use the medium screwdriver to extract the 2 screws
anchoring the thermostat to the control panel. Once free, transfer the wires to the
replacement thermostat. See Figure 5 for correct wiring.
Reverse steps 1–6 to install thermostat and reassemble oven.
IMPORTANT THERMOSTAT REASSEMBLY NOTE: Space the thermostat knob 1/8"
off the front control panel. Rotate the knob to check for proper clearance, the knob
should not bind against the control panel during the rotation.The set screw must be
aligned with the flat on the thermostat shaft. Anchor the wires clear of the motor fan
blades with wire ties.
Figure 5.Thermostat Assembly
LEADS TO INDICATOR LIGHT
AND HEATING ELEMENT
REAR VIEW
LEAD TO TERMINAL BLOCK

10
HEATING ELEMENT
REQUIRED TOOLS: Phillips screwdriver
1) REMOVE OUTER ENCLOSURE: See Outer Enclosure Removal.
2) REMOVE SUPPORT RACK: Remove the 2 finger screws right and left midway up
the front of the inner cavity. Flex the support rack around the finger screw heads
and bulb guard. Once the front of the rack has cleared the screws, gently flex the
rack into a parallelogram with the right side back and pull straight out.
3) REMOVE AIR VENT PANEL: Remove the 2 finger screws.This will release the
bulb guard, capillary bulb, and the deflector panel, allowing access to the heating
element.
4) REMOVE ELEMENT SUPPORTS: Remove the element supports (3) and
disconnect the wires to the element.
4) REMOVE HEATING ELEMENT: Remove the sheet metal screws attaching the
heating element, and remove through the inner cavity.
Reverse steps to install the heating element and reassemble the oven.
DOOR HINGE & LATCH
REQUIRED TOOLS: Phillips screwdriver
small screwdriver
The door gasket should fit snugly against the front face of the control panel.The latch
should catch and lock solidly onto the strike plate, sealing the door gasket snugly
against the control panel.
HINGE ADJUSTMENT
1) REMOVE COSMETIC HINGE COVER: The hinge covers are a spring fit and
remove by sliding directly away from the door. It may be necessary to use a small
screwdriver to encourage them initially.
2) ADJUST HINGES:Loosen the 4 screws holding the hinges to the door just enough
to allow repositioning of the ribbed channel locks and door.The door must be open
during the adjustment process.The channel lock should be positioned evenly and
equally on the upper and lower hinge to avoid putting a twist in the door. Use the
number of visible ribs as your positioning guide. See Figure 6.
3) REINSTATE HINGE COVER: There is an offset on one side of the cover.That
offset must face outward toward the front when installed.

11
DOOR HINGE & LATCH (continued)
LATCH ADJUSTMENT
The latch features a magnetic catch system.The magnetic catch is the primary lock.
When properly aligned, the door will latch positively with minimal pressure, sealing the
gasket snugly against the control panel.
ALL ADJUSTMENTS FOR THE LATCH ARE PERFORMED ON THE HANDLE.
Figure 6. Hinge Channel Lock
WITH NO RIBS SHOWING
THE GASKET WILL NOT
SEAL AGAINST THE FRONT PANEL
THE MORE RIBS SHOWING
THE TIGHTER THE DOOR
SEAL WILL BE.
FRONT
PANEL
GASKET
HINGE
HINGE
PLATE
FRONT
PANEL
GASKET
HINGE
HINGE
PLATE
DOOR
GAP
DOOR
2 RIBS SHOWING IS
A STANDARD FIT

12
MODEL 608 EXPLODED VIEW

13
WIRING DIAGRAM AND COMPONENTS LIST
NO. PART NO. DESCRIPTION QTY
10017761 Switch (20 Amp) 1
20017723 Motor 1
30017743 Thermostat (525˚F) 1
40017735 Heating Element 1
50017762 Terminal Block 1
6009093 Lamp (Red) 1
7008079 Cord (20 Amp) 1
800131 Strain Relief 1
9009681 Wire Nuts 2
10 0017705 20" 12GA AWG White Wire 2
11 008212 Limiting Thermostat 1
12 0017707 8" 12GA AWG White Wire 2
13 009040 8" 12GA AWG White Wire 2
14 0021379 11" 12GA AWG White Wire 1
15 0017733 15" 12GA AWG White Wire 1
16 0017734 12" 12GA AWG White Wire 1
17 0010028 6" 18GA AWG White Wire 1
Figure 7. 608 Wiring Diagram
410
11
12
16
5
15 9
87
1
13
12
3
17
6
10

14
SUGGESTED TIMES AND TEMPERATURES
NOTE: Actual times and temperatures may vary considerably from those shown below.
They are affected by the product weight, consistency, temperature, recipe, and type of
pan. If your recipe differ record your proven time and temperature for ready reference
PRODUCT DEGREE ˚F TIME
MEATS
Lasagna 275˚F 90 mins.
Hot Dogs, 10 1 lb. 325˚F 10–15 mins
Baked Stuffed Pork Chop 375˚F 20–30 mins.
Bacon (on racks) 400˚F 5–7 mins.
POULTRY
Chicken Breast & Thigh 350˚F 40 mins.
Chicken Back & Wing 350˚F 35 mins.
Chicken (2 1/2 lbs. Quartered) 350˚F 30 mins.
Chicken/Turkey Pot Pies 325˚F 30–35 mins.
FISH & SEAFOOD
Fish Sticks 325˚F 16–18 mins
Fish Steaks (5 oz. frozen) 350˚F 20 mins.
Baked Stuffed Shrimp 400˚F 6–7 mins.
Baked Stuffed Lobster 400˚F 10 mins.
Lobster Tails (frozen) 425˚F 9 mins.
POTATOES
Idaho Potatoes (120 ct.) 400˚F 50 mins.
Oven Roasted Potatoes 325˚F 10 mins.
BAKED GOODS
Frozen Berry Pie (22 oz.) 350˚F 30 mins.
Fresh Apple Pie (20 oz.) 375˚F 25 mins.
Pumpkin Pie 300˚F 30 mins.
Apple Turnovers 350˚F 15 mins.
Bread (1 lb. loaves) 325˚F 30 mins.
Corn Bread (Northern) 325˚F 25 mins.
Corn Bread (Southern) 375˚F 15–20 mins.
Hamburger Rolls 300˚F 15 mins.
Yeast Rolls 325˚F 25 mins.
Croissant 325˚F 15–18 mins
French Bread 375˚F 18–20 mins.
Chocolate Cake 325˚F 20 mins.
Fruit Cake 275˚F 70 mins.
Brownies 325˚F 20 mins
Danish 325˚F 12 mins.
Sugar Cookies 300˚F 15 mins.
Chocolate Chip 325˚F 10 mins.
Peanut Butter Cookies 325˚F 10 mins.

15
BAKING RECORDS
PRODUCT TIME TEMP. PRODUCT TIME TEMP.

WISCO INDUSTRIES, INC.
Your Authorized Service Representative
for Warranty Work
1-800-999-4726
Certified to ISO 9001, 1994