Wittco 1200-AD-SS, 750-AD-SS Operation & Maintenance Manual

OPERATIONS
MAINTENANCE
MANUAL
COOK & HOLD OVEN SYSTEMS
COMMERCIAL & INSTITUTIONAL SERIES
WITTCO MODEL NUMBERS
/30-AD-S5 750-AD-SS-IS
1000-AD-SS 1000-AD-SS-IS
1200-AD-SS 1200-AD-SS-IS
1400-AD-SS 1400-AD-SS-IS
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| À À foodservice
equipment
LIMITED WARRANTY
Wittco warrants the Products that it manufactures to be free from defects in materials and
workmanship, under normal use and service, for the periods indicated below from the date of purchase
when installed and maintained in accordance with Wittco's written instructions. Buyer must establish
the "Products" purchase date by returning Wittco’s Warranty registration Card or by other means
satisfactory to Wittco in its sole discretion.
Wittco warrants its Products to be free from defects in materials and workmanship from the date of
purchase (subject to the foregoing conditions) for the period(s) of time and on the conditions listed
below:
a) Ninety (90) days Labor Warranty
b) One (1) Year Parts Warranty
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY,
EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR PATENT OR OTHER
INTELLECTUAL PROPERTY RIGHT INFRINGEMENT. Without limiting the generality of the foregoing,
SUCH WARRANTIES DO NOT COVER: Coated incandescent light bulbs or heat lamps, all glass
components, Product misuse, tampering, misapplication, application of improper voltage, or
recalibration of thermostats or high limit switches.
LIMITATION OF REMEDIES & DAMAGES
Wittco’s liability and Buyer's exclusive remedy hereunder will be limited solely, at Wittco's option, to
repair or replacement by a Wittco authorized service agency (other than where Buyer is located outside
of the United States or Canada, in which case Wittco's liability and Buyer's exclusive remedy
hereunder will be limited solely to replacement of part under warranty) with respect to any claim made
within the applicable warranty period referred to above. Without limiting the generality of the
foregoing, all portable Products, as defined by Wittco, shall be delivered by Buyer, at its sole expense,
to the nearest Wittco authorized service agency for replacement or repair. Wittco reserves the right
to accept or reject any such claim tn whole or in part. Wittco will not accept the return of any Product
without prior written approval from Wittco, and all such approved returns shall be made at Buyer’s sole
expense. WITTCO WILL NOT BE LIABLE, UNDER ANY CIRCUMSTANCES, FOR CONSEQUENTIAL OR
INCIDENTAL DAMAGES, INCLUDING BUT NOT LIMITED TO LABOR COSTS ORLOST OF PRODUCTS
AND LOSS OF PROFITS RESULTING FROM THE USE OF OR INABILITY TO USE THE PRODUCTS.
V,AV{ wittco
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WITTCO TECHNICAL € PRODUCT SUPPORT
TECHNICAL SUPPORT € SERVICE INQUIRES MAY BE DIRECTED TO WITTCO BY:
1. CALLING DIRECTLY TO:
WITTCO FOODSERVICE EQUIPMENT TECHNICAL € SERVICE DEPARTMENT - (800)
367-8413
8:00 AM - 4:30 PM (CENTRAL TIME)
2. FAXING DIRECTLY TO:
WITTCO FOODSERVICE EQUIPMENT TECHNICAL & SERVICE DEPARTMENT - (414)
354-2821
DAILY 24 HOURS
3. MAILING DIRECTLY TO:
WITTCO FOODSERVICE EQUIPMENT INC.
7737 NORTH 81ST. STREET
MILWAUKEE, WISCONSIN 53223
USA
WHEN DIRECTING INQUIRIES TO WITTCO PLEASE HAVE THE FOLLOWING INFORMATION
AVAILABLE TO AVOID DELAYS
1. Wittco model number indicated on the equipment serial data plate located at the
electrical connection.
2. Wittco serial number indicated on the equipment serial data plate. The equipment
serial number will also have two (2) alpha characters immediately following the serial
number. These alpha characters are part of the serial
VAY4 wittco
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INTRODUCTION
Wittco Foodservice Equipment’s Cook and Hold Oven System is a basic unit of food
preparation equipment. It has found wide acceptance in both institutional and commercial
food service operations.
This manual has been produced to provide persons responsible for the operation and
maintenance of the oven with a simple but comprehensive understanding of its proper use.
We recommend that this manual be read and understood prior to placing the oven into
operation.
As with any piece of food service equipment, this oven system will require a minimum of
care and maintenance. Suggestions for this procedure are contained in this manual and
should become a regular part of the operation of the unit.
NOTE: BEFORE USING THE OVEN IT SHOULD BE THOROUGHLY
CLEANED IN ACCORDANCE WITH THE INSTRUCTIONS CONTAINED IN
THIS MANUAL.
It is recommended that prior to placing the oven system into operation that it be operated
on the cook cycle for approximately two (2) hours at 350° F. to prep it for operation.
Should repair or adjustment of the unit become necessary, we suggest that procedures
described in this manual be followed. The operator may also contact the authorized Wittco
dealer who sold the product or an authorized Wittco service agency. If the needed repair
occurs during the warranty period, prior authorization is required from Wittco by the
service company before the work is done.
It is our sincere desire that you obtain the maximum benefit from your Cook and Hold
Oven System. If at any time questions arise or additional information is required, contact
Wittco at 800 367-8413.
DESCRIPTION
Operators have found that cooking foods utilizing low temperature methods reduces the
amount of product shrinkage and increases the amount of product yield. This is because
less moisture is cooked out of the food when it is prepared at 225° F. that when it is
prepared at 350° F. Because of this fact, the operator will serve a product that has greater
customer satisfaction because of the increased flavor and moisture this meat possesses.
UNCRATING
Each Wittco Foodservice Equipment oven is packed in a cardboard carton which, in turn,
is banded to a wooden pallet. When the cabinet is received by the operator, the carton
should immediately be inspected for any sign of visible exterior damage. If carton is
punctured or dented, it may be an indication that the cabinet has sustained concealed
freight damage.
It is very important that any evidence of damage be noted on the Bill of Lading at
the time of receipt.
UNPACKING THE CABINET
Remove the banding material holding the carton to the pallet.
Remove the cardboard carton and the plastic bag covering the cabinet.
Carefully lift the cabinet off the carton bottom and pallet and place it on the floor.
Open the door and remove any packing materials which may have been used to
hold the tray slides in place.
NOTE: The casters for the 1200 AD SS and the 1200 AD SS IS ovens are packed
in a separate carton. Remove them from the carton and install them on the oven.
5. Heat the oven for approximately 2 hours before using.
awn
CABINET LOCATION
PLACING THE OVEN IN THE PROPER LOCATION IS IMPORTANT FOR
EFFICIENT OPERATION. CHOOSE A LOCATION FOR THE OVEN IN AN
AREA WHICH WILL PROVIDE EASY LOADING AND UNLOADING
WITHOUT INTERFERING WITH THE FINAL ASSEMBLY OF FOOD
ORDERS. PROVIDE AT LEAST SIX INCHES OF SPACE ON EACH SIDE TO
ALLOW FOR PROPER AIR CIRCULATION AROUND THE OVEN.
OPERATING CONTROLS
A complete explanation of the operating controls will be found in the Cook Guide which is
supplied with the oven.
All operating controls are located on the front control panel. This panel contains the on/off
switch, the electronic cooking and holding thermostats, the electronic timer and the start
button to engage the roast cycle.
NOTE: IT IS RECOMMENDED THAT THE OVEN CONNECTION TO THE
POWER SOURCE BE DONE BY A LICENSED ELECTRICIAN.
NOTE: UPON CONNECTING THE CONTROL MODULE TOP TO THE
POWER SOURCE, THE COOLING FANS MAY NOT OPERATE. THESE FANS
WILL ONLY OPERATE WHEN THE THERMOSTAT TO WHICH THEY ARE
CONNECTED REQUIRES IT.
ELECTRICAL REQUIREMENTS
Wittco Cook and Hold Ovens can be factory wired for 120, 208,220, or 240 volts AC,
single or three phase, 60 or 50 cycle service.
VERIFY THAT THE VOLTAGE AND PHASE OF THE POWER SOURCE IS
IDENTICAL TO THE OVEN SYSTEM DATA PLATE BEFORE CONNECTING.
The oven must be adequately and safely grounded before operation. A separate disconnect
switch or circuit breaker is recommended at a convenient location between the oven and
power source.
TESTING THE OVEN
Each oven is completely checked and tested prior to shipment. However, it is a good
practice to completely check the unit again after unpacking and installation.
1. Connect oven to power source.
2. Turn the oven on and check that the low velocity interior circulating fans are
running. At the same time check that the indicator lights under the on/off switch
and the hold thermostat are illuminated.
3. Set the timer dials to 01.5 (this equals one hour and 30 minutes of cooking time),
set the hold thermostat to 140° F, and set the roast thermostat to 225° F.
4. Push the start button which will start the roasting cycle. Verify that the power and
the roasting indicator lights are illuminated.
5. In approximately 15-20 minutes the oven compartment will be at the temperature
indicated on the roast thermostat.
6. The LED digital display will count down in six minute intervals during the roasting
cycle until no time remains on the timer. At that time the oven system will
automatically switch to the hold cycle.
If all of the functions perform satisfactorily, the oven is ready for operation.
CLEANING
The interior of the oven should be cleaned whenever a food spill occurs. Use a mild soap
and water to clean. Never use harsh chemicals or abrasive pads to clean the cabinet.
The simple cleaning process follows.
1. DISCONNECT THE OVEN FROM THE POWER SOURCE.
2. Remove the control module top and place it away from the oven cabinet.
CLEANING (CON’T)
3. Lift and tip the side tray racks toward the center of the cabinet. Remove them from
the cabinet. These racks should be taken to a sink or dish washer for a thorough
cleaning.
4. Remove the interior rear mounted air distribution tunnel and take 1t to a sink or
dish washer for cleaning.
5. Clean the interior oven cavity with soap and water.
6. Reassemble the oven.
REPLACEMENT OF ELECTRICAL COMPONENTS
It is highly recommended that only Wittco Foodservice Equipment replacement parts be
used to insure compatibility of component parts in the operation of cook and hold oven
systems. All of the electrical components which may require servicing are in the control
module top.
WARNING: DISCONNECT THE OVEN FROM THE POWER SOURCE
BEFORE REMOVING THE CONTROL MODULE TOP FROM THE OVEN
CABINET.
ON/OFF SWITCH REPLACEMENT
1. DISCONNECT THE OVEN FROM THE POWER SOURCE.
2. Remove the protective cover from the control module top.
3 Notice the arrangement of all electrical leads and refer to the wiring diagram for
reference. Remove the defective switch from the control panel.
4. Install the replacement switch and secure it to the control panel. Reconnect the
electrical leads to the new switch.
5. Reinstall the control module cover.
6. Test the oven as described in the TESTING THE OVEN section.
COOK OR HOLD TEMPERATURE CONTROL REPLACEMENT
1. DISCONNECT THE OVEN FROM THE POWER SOURCE.
2. Remove the top cover by removing the retaining screws and lifting it off the
control module top to expose the thermostat.
COOK OR HOLD TEMPERATURE CONTROL REPLACEMENT (CON’T)
3. Notice the arrangement of all electrical leads and refer to the wiring diagram for
reference.
д. Disconnect the electrical leads of the temperature control needing replacement
from the circuit board.
5. Remove the black knob by loosening the “L-end” screws that holds it to the
temperature controller stem.
NOTE: PRIOR TO LOOSENING THE “L-END” SCREWS, TURN THE
BLACK TEMPERATURE CONTROL KNOB COUNTER CLOCK-WISE
UNTIL THE KNOB STOPS.
7. Remove the two screws on the front of the control panel that hold the temperature
control in place and remove it.
8. Install the replacement temperature control following the reverse of the above
procedure.
NOTE: ONCE THE BLACK KNOB HAS BEEN REINSTALLED TURN IT
COUNTER CLOCK-WISE UNTIL THE TEMPERATURE CONTROL
SHAFT STOPS. LOOSEN THE “L-END” SCREWS AND REPOSITION
THE WHITE ARROW ON THE KNOB TO POINT TO THE SMALL
SILVER DASH UNDER THE LOWEST TEMPERATURE SETTING.
9. Reinstall the control module cover and screws.
10. Test the oven as described in the TESTING THE OVEN section.
INDICATOR LIGHT REPLACEMENT
1. DISCONNECT THE CABINET FROM ITS POWER SOURCE.
2. Remove the top cover by removing the screws and lifting the cover off the control
module top to expose the indicator light.
3. Notice the arrangement and connection ofall electrical leads and refer to the
wiring diagrams for reference.
4. Disconnect the electrical leads to the indicator light and remove it.
5. Install the replacement indicator light by pushing it into the control panel until the
retaining clips snap into place.
INDICATOR LIGHT REPLACEMENT (CON’T)
Reconnect the electrical leads to the indicator light.
Reinstall the module control top cover and screws.
Test the oven as described in the TESTING THE OVEN section.
COOK CYCLE TIMER REPLACEMENT
DISCONNECT THE OVEN FROM THE POWER SOURCE.
Loosen the two screws on the timer face plate holding the timer in its housing.
Carefully pull the timer straight out from the timer housing. (The rubber gasket
remains attached to the housing surface.)
Insert the replacement timer into the timer housing.
Tighten the two screws holding the timer to the housing.
Test the oven as described in the TESTING THE OVEN section.
COOLING FAN REPLACEMENT
DISCONNECT THE OVEN FROM THE POWER SOURCE.
Remove the top cover by removing the screws and lifting the cover off the control
module top to expose the cooling fans.
Notice the arrangement and connection of all electrical leads and refer to the
wiring diagrams for reference.
Disconnect the electrical leads to the cooling fan and remove it.
Install the replacement cooling fan.
NOTE: THE AIR FLOW DIRECTION ARROW MUST POINT TO THE
LEFT OR AWAY FROM THE CONTROL MODULE TOP.
Reconnect the electrical leads to the cooling fan.
Reinstall the module control top cover and screws.
Turn the oven on for approximately 30 minutes at 225° F to see if the cooling
fan operates.
COOLING FAN THERMOSTAT REPLACEMENT
DISCONNECT THE OVEN FROM THE POWER SOURCE.
Remove the top cover by removing the screws and lifting the cover off the control
module top to expose the cooling fan thermostat.
Notice the arrangement and connection of all electrical leads and refer to the
wiring diagrams for reference.
Disconnect the electrical leads to the cooling fan thermostat and remove it.
Install the replacement cooling fan thermostat.
Reconnect the electrical leads to the cooling fan thermostat.
Reinstall the module control top cover and screws.
Turn the oven on for approximately 30 minutes at 225° F to see if the cooling
fan operates.
BLOWER ASSEMBLY REPLACEMENT
DISCONNECT THE OVEN FROM THE POWER SOURCE.
Remove the top cover by removing the screws and lifting the cover off the control
module top to expose the blower assembly.
Notice the arrangement and connection of all electrical leads and refer to the
wiring diagrams for reference.
Disconnect the electrical leads to the blower assembly at the terminal strip.
Remove the protective fan grill located on the bottom of the control module top
exposing the blower cage.
Insert an “L-end” wrench into the set screw holding the blower to the motor shaft.
Remove the cage from the blower motor.
Remove the three (3) hex nuts holding the blower motor housing to the oven and
remove it.
Install the replacement blower motor by following the reverse of the directions
above.
Reconnect the electrical leads to the blower assembly.
10.
11.
10.
BLOWER MOTOR REPLACEMENT (CON”T)
Reinstall the module control top cover and screws.
Test the oven as described in the TESTING THE OVEN section.
HEATING ELEMENT REPLACEMENT
DISCONNECT THE CABINET FROM THE POWER SOURCE.
Remove the top cover by removing the screws and lifting the cover off the control
module top.
Remove all the insulation surrounding the heating element compartment and save it
for reuse.
Remove the screws from the heating element cover to expose the elements.
Notice the arrangement and connection of all electrical leads and refer to the
wiring diagrams for reference.
Disconnect the electrical leads from the heating elements
Remove the nuts securing the heating element to the heating element compartment
and remove it.
Install the replacement heating element by following the reverse of the above
directions.
Reinstall the module control top cover and screws.
Test the oven as described in the TESTING THE OVEN section.
ELECTRICAL RELAY REPLACEMENT
DISCONNECT THE CABINET FROM THE POWER SOURCE.
Remove the top cover by removing the screws and lifting the cover off the control
module top exposing the electrical relay.
Remove the defective relay but leave the wires attached. Notice the arrangement
and connection of all electrical leads and refer to the wiring diagrams for reference.
Install the new relay and move the wires from the defective relay to the terminal
screws on the replacement relay.
10.
ELECTRICAL RELAY REPLACEMENT (CON’T)
Reinstall the module control top cover and screws.
Test the oven as described in the TESTING THE OVEN section.
TEMPERATURE CONTROL PROBE REPLACEMENT
DISCONNECT THE OVEN FROM THE POWER SOURCE.
Remove the top cover by removing the screws and lifting the cover off the control
module top exposing the temperature probe.
Notice the arrangement and connection of all electrical leads between the
temperature probe and the circuit board and refer to the wiring diagrams for
reference.
Disconnect the probe lead wires from the solid state circuit board. These wires are
not polarity sensitive.
Remove the wire ties that hold the probe wires to the other wires.
Remove the wire ties that hold the temperature probe to the fan grill on the inside
of the oven.
Remove the insulating grommet from the probe wires so that the defective probe
can be removed.
Install the replacement temperature probe by following the reverse of the above
directions.
Reinstall the module control top cover and screws.
Test the oven as described in the TESTING THE OVEN section.
TROUBLE SHOOTING PROCEDURE
WARNING: EXTREME CAUTION MUST BE EXERCISED WHEN WORKING
AROUND ELECTRICAL EQUIPMENT TO PREVENT THE POSSIBILITY OF
ELECTRICAL SHOCK RESULTING IN INJURY OR DEATH. THESE TEST
PROCEDURES SHOULD ONLY BE DONE BY A LICENSED ELECTRICIAN
OR AN AUTHORIZED SERVICE AGENCY. THEY SHOULD NOT BE
ATTEMPTED BY ANY PERSON WHO IS NOT TRAINED IN THE SAFE AND
PROPER USE OF TEST EQUIPMENT.
Always work in a safe manner. Be sure the power supply is turned off before touching any
wires or terminals to prevent the possibility of electrical shock or damage as a result of
electrical short by the meter probes.
No wires should be disconnected from the terminals without first disconnecting the power
source to the oven.
This procedure supplies a list of symptoms that may be observed and a reference section
that may be referred to locate and correct the problem.
TEST EQUIPMENT REQUIRED
The preferred piece of equipment required is a DVM (Digital Voltmeter) and a clamp-on
ammeter. If one of these is not available, on ohmmeter is necessary to determine if a short
circuit or a ground exists. The meter should be capable of reading 0 to 100 k ohms full
scale.
NORMAL OPERATION
It is preferred that the technician has had the opportunity to observe the normal operation
of the oven so that when there is a malfunction, it may be easily recognized with a
minimum of testing.
In normal operation, as soon as power is applied to the oven and the power switch is
turned on, the POWER and the HOLD CYCLE indicator lights should be illuminated. In
addition, the blower motors inside the oven should start.
If the HOLD TEMPERATURE knob is set to a temperature higher than the present oven
temperature, the heating contactor should energize and supply power to the heating
elements. When the oven temperature reaches approximately 105° F, the cooling fans will
begin to operate. These fans will run as long as necessary to provide cooling for the
electrical controls in the control module top.
If the OVEN TIMER is set to a value greater than 00.0 and the START button is
depressed, the control will switch from the HOLDING CYCLE to the ROASTING
CYCLE and maintain it for the length of time entered on the OVEN TIMER. When the
set time expires, the oven will automatically switch from the ROASTING CYCLE to the
HOLDING CYCLE and hold the food for up to 24 hours.
SYMPTOMS AND PROCEDURES
I. NO HEAT IN THE HOLD CYCLE
|. Check that the oven is connected to the power source and the circuit breaker or
fuse is not tripped.
2. Check that the oven power switch is on.
10
I.
Ш.
If the power switch is in the on position and the power indicator light is not
illuminated, remove the fuses and verify continuity with the ohmmeter. If the fuses
are defective, there 1s probably a shorted component or wire. Refer to Section A
for additional testing.
Replace fuses with the same type that were supplied with the oven. Use only
#SLC-3 current limiting fuse, Type G, 250 volt.
If the power indicator light is illuminated and the holding indicator light is not,
there is a problem with the light, the timer or the wiring. (The timer should be set
to 00.0 hours.) Refer to Section B for additional testing.
Position the HOLDING TEMPERATURE knob at 200° F. If the heating
contactor does not energize, a problem exists with the temperature probe,
temperature control, the set point relay, the timer, or the heater contactor. Refer to
the following sections for additional testing:
Section B for timer
Section C for temperature control and set point relay
Section F for contactor
Section G for temperature probe.
NO HEAT IN THE ROASTING CYCLE
Set the ROASTING TIMER to 1.5 on the digital timer display, set the
ROASTING TEMPERATURE knob to 250° F, and depress the START button.
If the ROASTING indicator light is not illuminated, there is a problem with the
either the TIMER or the indicator light. Refer to section B for additional testing.
If the ROASTING indicator light is illuminated and the oven is not heating, there
is a problem with the set point relay, the electronic circuit board, the contactor, the
heating element(s), the temperature probe, or the wiring. Refer to the following
sections in succession for additional testing:
Section D for temperature control and set point relay,
Section F for heater contactor,
Section G for temperature probe.
CHATTERING OF THE CONTACTOR
This may be observed at either the energizing or de-energizing of the contactor.
Test the contactor with a voltmeter or test light from wire #25 on the top of the
electronic circuit board to wire #47 on the AC contactor coil. The reading must be
very steady except for the 5 volts line drop that may occur when the heating
elements are connected to the line. If the voltage is not steady, there is a problem
with the AC power, the POWER SWITCH, the FUSES, or the wiring.
11
IV.
If the voltage is steady, there may be a problem with the set point relay, the
electronic circuit board, or the wiring. Refer to the following sections for
additional testing:
Section E if the voltage is not steady,
Section C for the Holding Cycle
Section D for the Roasting Cycle.
OVEN IS SLOW TO HEAT
Check the line voltage. If it is below nominal, there will be a significant reduction
in available heating. For example, a 10% lower line voltage with result in a 19%
lower heat supply.
OVEN DROPS OUT OF ROASTING CYCLE
A loss of power may have occurred. Refer to section E for additional testing.
A problem may exist with the TIMER. Refer to section B for additional testing.
SECTION A. TESTING FOR GROUNDS AND/OR SHORTED COMPONENTS
DISCONNECT THE OVEN FROM THE POWER SOURCE BEFORE
PERFORMING ANY TESTING WITH AN OHMMETER
TESTING FOR GROUNDS
1.
2.
3.
Power switch in the off position.
Connect on lead of the ohmmeter to the metal oven top.
Touch the other lead to the following and observe that there should be an open
circuit in each case:
T1 on element contactor
T2 of element contactor
Wire 7 on vent fan switch
Wire 29 on power switch
Wire 50 on power switch
Wire 10 on power switch
Wire 29 on power switch
Any reading at all, indicates a component partially or completely shorted to
ground.
TESTING FOR SHORTED COMPONENTS
Test the following to determine which component is shorted. If any component has
significantly lower reading than is listed, it is suspect and should be replaced.
12
TESTING HEATING ELEMENTS
Test between T1 and T2 on the contactor with the ohmmeter and compare the
value to the table below:
The basic element has a resistance of 23 ohms regardless of the voltage rating on
the oven. Because the number of elements in the oven effects the reading, compare
the number of elements in the oven to the following chart to determine if any
elements are open or shorted.
3 elements 3 PH
L1-L2 15.3 ohms
L1-L3 15.3 ohms
L2-L3 15.3 ohms
3 elements
7.7 ohms
2 elements
11.5 ohms
1 element
23 ohms
TESTING COOLING FAN MOTORS
Test wire 7 to wire 50 on the cooling fan motors. A typical reading on a 120
volt oven is 47 ohms. A 208/240 volt oven with have 183 ohms.
NOTE: These readings are for two fans connected in parallel. A new replacement
fan will read double.
TESTING BLOWER MOTORS
1. Disconnect the blower motor wires from the terminal strip and test with an
ohmmeter to determine whether they are shorted or not. The reading should be
approximately as shown in the table below. If a discrepancy exists, check each
motor individually.
Voltage 1 Blower 2 Blowers 3 Blowers
120 Volt 19 ohms 9.5 ohms 6.3 ohms
208/240 Volt 70 ohms 35 ohms 23.3 ohms
Reconnect the wires to the terminal strip.
WIRING INSPECTION
Check for frayed or touching wires on any terminal strip, especially on the set
point relay and on the ROASTING TIMER as they are very close to each other.
Clean and dress up the wires as needed.
TESTING THE MOV VARISTOR
Lift one wire of each MOV from the terminal and check with an ohmmeter. If the
reading is less than 100K ohms, the unit is defective.
TESTING THE TEMPERATURE CONTROL
Disconnect the red and black wires from the AC wiring. The ohmmeter should
read approximately 1/3K ohms between red and black wires. The ohmmeter should
13
read approximately 575 ohms between the white and black wires. If the circuit is
open or shorted, the electronic circuit board must be replaced.
TESTING THE CONTACTOR COIL
Disconnect all wires from one side terminal of the contactor coil. The ohmmeter
should read approximately 675 ohms for a 208/240 volt unit or 235 ohms for a
120 volt unit. If the circuit is open or shorted, the contactor must be replaced.
TESTING THE ROASTING TIMER COIL
Disconnect all wires from terminal #1. The ohmmeter should read approximately
520 ohms for a 240 volt unit or 140 ohms for a 120 volt unit. If the circuit is open
or shorted, the timer must be replaced.
TESTING THE SET POINT RELAY COIL
Unplug the set point relay from its socket and measure coil resistance. Ohmmeter
should read approximately 17.2K ohms across relay coil contacts.
SECTION B TIMER TEST
Connect one lead of a voltmeter to wire 33 on the HOLDING indicator light and
connect the other lead to timer terminals 10,14,12, and 11 each in succession to
test for AC power. They should all indicate line voltage. If line voltage is not
indicated, check the wiring or replace the timer.
Set the ROASTING TIMER for 1.0 hour and press the START button. Connect
one lead of a voltmeter to wire 33 on the HOLDING indicator light and connect
the other lead to timer terminals 9, 1, 8, 6, 5, 4 each in succession to test for AC
power. They should all indicate line voltage. If line voltage is not indicated, check
the wiring or replace the timer.
SECTION C. ELECTRONIC SOLID STATE CIRCUIT BOARD TEST -
HOLDING CYCLE
1. Test for AC power between red and black wires at the input to the circuit board.
(On the 120 volt units the wires are black and white.)
2. Test for AC power between wires 25 on the circuit board and 47 on the contactor
coil. The reading must be very steady, except for the 5 volt line drop that may
occur when the element is connected to the line.
3. Test for de-energized set point relay. (0 volts between heavy coil wires on relay
terminals 4 and 1.)
4. Increase the HOLDING TEMPERATURE slowly just to the point which causes
the contactor to be energized.
14
Test for poor relay contact by tapping the set point relay with a pencil. Observe
that there should be no chattering or dropping out by the contactor, but rather, it
should stay energized.
If tapping the relay with a pencil causes chattering of the contactor, check for
frayed or broken wires on the set point relay, especially the 4 wires which come
from the set point pots. After that, if tapping the relay either causes a chattering or
prevents it temporarily, the relay has a poor contact internally and must be
replaced with a new one.
Test for a broken temperature probe. Refer to Section G for additional
information.
If the above test fail to identify the problem, the electronic circuit board is faulty
and must be replaced.
SECTION D. ELECTRONIC SOLID STATE CIRCUIT BOARD TEST -
ROASTING CYCLE
1.
Test for AC power between red and black wires at the input to the circuit board.
(On the 120 volt units the wires are black and white.)
Test for AC power between wires 25 on the circuit board and 47 on the contactor
coil. The reading must be very steady, except for the 5 volt line drop that may
occur when the element is connected to the line.
Test for energized set point relay. (1/2 line volts between heavy coil wires on relay
terminals 4 and 1.)
Set the ROASTING TEMPERATURE to 350° F which causes the contactor to be
energized. (If it does, skip to step 8 below otherwise go to step 5.)
If the contactor does not energize, test for line voltage on the coil on the contactor
between wires 26 and 47. Refer to Section F for additional testing.
If the contactor has no voltage, test for an open thermistor. Refer to Section G for
additional details.
If the contactor is energized but there is still no heat, refer to Section A for
additional test.
Rotate the ROASTING TEMPERATURE knob slowly just to the point to cause
the contactor to be energized.
15
9. Test for poor relay contact by tapping the set point relay with a pencil. Observe
that there should be no chattering or dropping out by the contactor, but rather, it
should stay energized.
If tapping the relay with a pencil causes chattering of the contactor, check for
frayed or broken wires on the set point relay, especially the 4 wires which come
from the set point pots. After that, if tapping the relay either causes a chattering or
prevents it temporarily, the relay has a poor contact internally and must be
replaced with a new one.
10. Ifthe above test fail to identify the problem, the electronic circuit board is faulty
and must be replaced.
SECTION E GENERAL VOLTAGE TESTING
Test for line voltage between the following:
L1 and L2 on the contactor.
Wires 29 and 50 on the power switch
Terminal 15 and 2 on the timer
Wire 47 on the contactor coil and 25 on the electronic circuit board
Connect one voltmeter probe to wire 47 on the contactor coil and the other to the
following wires in succession:
Wire 10 on the power switch,
Terminal 14 on the timer,
Wire 25 on the circuit board.
If an intermittent loss of voltage, or a low voltage condition, the cause must be
determined and corrected.
SECTION Е. CONTACTOR TESTS
If the contactor has line voltage on the coil but it is not picked up to close the
power contacts, the coil is failed open and the contactor must be replaced.
SECTION G. TEMPERATURE PROBE TESTS
Disconnect both wires of the probe from the connectors of the electronic circuit
board. Connect the ohmmeter to the probe wires. If the ohmmeter reading is
greater than 91K ohms at 70° F, the probe is faulty.
Typical values are:
91K ohms at 70°
53K ohms at 100°
7.5K ohms at 200°
1.79K ohms at 300°
16
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foodservice
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equipment
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foodservice
equipment
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HOLD TEMP ROAST TEMP 208V, 1PH, 60HZ
WITTCO SERIES - COMMERCIAL COOK & HOLD OVENS
WITTCO FOODSERVICE EQUIPMENT INC.
REPLACEMENT PARTS LIST
6/25/98
WITTCO MODEL NUMBER AND QUANTITY REQUIRED
PART NO. PART DESCRIPTION
750-AD 1000-AD 1200-AD 1400-AD
AD-301-1000-0 BLOWER MOTOR REPLACEMENT KIT 110 VOLT 1 2 3 -
AD-301-2000-0 BLOWER MOTOR REPLACEMENT KIT 208-240 VOLT 2 3 a
AD-266-0000-0 BLOWER MOTOR RETURN AIR GRATE | | | 2
WP-114-5R CASTER, 5" HEAVY DUTY RIGID 2 2 2 2
WP-114-5S CASTER, 5" HEAVY DUTY SWIVEL W/BRAKE 2 2 2 2
AD-260-4000-0 CONTACTOR - 2 POLE / 110 VOLT ] 1 1 2
AD-260-2000-0 CONTACTOR - 2 POLE / 208-240 VOLT 1 1 1 2
AD-260-3000-0 CONTACTOR - 3 POLE / 208-240 VOLT (3PHASE) l 1 1 2
AD-264-0000-0 CONTROL TOP MODULE COVER l 1 1 2
AD-312-0000-0 CONTROL PANEL DECAL (BLUE) 1 | ] 2
AD-417-0000-1 CONTROLLER ONLY 120 VOLT 1 l | 2
AD-417-0000-2 CONTROLLER ONLY 208-240 VOLT 1 I | 2
CONTROLLER COMPLETE 120 VOLT (INCLUDES
AD-247-2000-1 POTENTIOMETERS, PROBE & RELAY) | 1 1 2
CONTROLLER COMPLETE 208-240 VOLT
AD-247-2000-2 (INCLUDES POTENTIOMETERS, PROBE & RELAY) ] ] | 2
AD-161-2000-0 CORD, 6FT 208-240 VOLT (NO PLUG) l Г 2
AD-161-3000-0 CORD, 6FT 208-240 VOLT (NO PLUG)(1200 ONLY) 1
AD-161-1000-0 CORD, 6FT 120 VOLT ( NO PLUG) | l l 2
AD-265-0000-0 DIVIDER BAR (FOR 1200 ONLY) 1
AD-263-1000-0 DOOR, (NO HARDWARE) 1
AD-263-2000-0 DOOR, (NO HARDWARE) 1 2
AD-263-3000-0 DOOR, (NO HARDWARE) 2
AD-134-1000-0 DOOR CATCH ONLY (NO HANDLE) 1 2 2
AD-134-0000-0 DOOR LATCH COMPLETE W/CATCH | ] 2 2
AD-280-1000-0 ELEMENT, 1900 WATT 120 VOLT 2 3 N/A 6
AD-280-1000-0 ELEMENT, 1900 WATT 208-240 VOLT 1 2 3 4
AD-305-1000-0 FAN COOLING MOTOR 120 VOLT 2 2 2 4
AD-305-2000-0 FAN COOLING MOTOR 208-240 VOLT 2 2 2 4
WITTCO MODEL NUMBER AND QUANTITY REQUIRED
PART NO. PART DESCRIPTION
750-AD 1000-AD 1200-AD 1400-AD
AD-253-0000-0 FAN SCREEN FOR COOLING MOTOR 2 2 2 =.
AD-210-0000-0 FUSE HOLDER 2 2 2 ¿l
AD-207-0000-0 FUSE, 3 AMP 2 2 2 ‘|
AD-142-750-E GASKET, DOOR ALUMINUM EXTRUSION ]
AD-142-1000-E GASKET, DOOR ALUMINUM EXTRUSION 1 2
AD-142-1200-E GASKET, DOOR ALUMINUM EXTRUSION 2
WP-302 GASKET, DOOR (BLACK) BY THE FT. 8 IP 21' 21'
AD-142-HT GASKET, HOT TOP SEAL / ORANGE | l 1 2
WP-111 HINGE, DOOR 2 2 A 4
LATCH SPRING LOADED
AD-3 10-0000-0 (INCLUDES BOLTS FOR HOT TOP) 3 5. 4 8
WP-040 LIGHT, INDICATOR ROUND 125 VOLT 3 3 3 6
AD-226-0000-0 LIGHT, INDICATOR ROUND 250 VOLT 3 3 3 6
AD-416-0000-0 POTENTIOMETERS (SET/2) ] | ] 2
AD-242-0000-0 POTENTIOMETER KNOBS 2 2 2 A
AD-246-0000-0 PROBE 1 1 l 2
AD-261-5000-0 RACKS, INT. SIDE 2
AD-261-2000-0 RACKS, INT. SIDE 2 a
AD-261-3000-0 RACKS, INT. SIDE 2
WP-305 RACK, SIDE RETAINING BOLTS 38 8 16 16
RELAY 120 VOLT
AD-415-2000-0 (SWITCHING CUBE TYPE - CLEAR) l 1 1 2
RELAY 208-240 VOLT
AD-415-1000-0 (SWITCHING CUBE TYPE - SMOKE BLACK) l l | 2
AD-419-0000-0 SECURITY COVER - CLEAR 1 l 1 2
AD-252-0000-0 STRAIN RELIEF AT POWER CORD l l 1 2
AD-135-0000-0 SUPPRESSOR (ORANGE) 2 2 2 =.
AD-212-0000-0 SWITCH, ON/OFF ROCKER 2
AD-244-0000-0 SWITCH, START PUSH BUTTON (BLUE) 1 1 l 2
AD-206-2000-0 TERMINAL BLOCK, INTERNAL DISTRIBUTION l l l 2
AD-206-1000-0 TERMINAL BLOCK - POWER CONNECT 1 | 1
AD-241-1000-0 THERMOSTAT - HI LIMIT 1 1 2
WITTCO MODEL NUMBER AND QUANTITY REQUIRED
PART NO. PART DESCRIPTION
750-AD 1000-AD 1200-AD 1400-AD
AD-251-0000-0 THERMOSTAT FOR COOLING MOTOR l 1 1 2
AD-232-2000-0 TIMER - ATC 120 VOLT ] Г Г 2
AD-232-1000-0 TIMER - ATC 208- 240 VOLT 1 1 | 2
AD-235-0000-0 TIMER BUTTONS (SET OF 3) | | 1 2
AD-267-1000-0 TUNNEL, AIR FLOW l
AD-267-2000-0 TUNNEL, AIR FLOW 1 2
AD-267-3000-0 TUNNEL, AIR FLOW 1
CONTROL MODULE (COMPLETE ТОР) 120 VOLT
750-Т-С ОК 208-240 VOLT IPHASE
CONTROL MODULE (COMPLETE TOP) 120 VOLT
1000-T-C OR 208-240 VOLT IPHASE ] 2
1200-T-C
CONTROL MODULE (COMPLETE TOP)
208-240 VOLT IPHASE
WITTCO FOODSERVICE EQUIPMENT INC.
REPLACEMENT PARTS LIST
WITTCO SERIES - INSTITUTIONAL COOK & HOLD OVENS
6/25/98
WITTCO MODEL NUMBER AND QUANTITY REQUIRED
PART NO. PART DESCRIPTION
750-15 1000-15 1200-15 1400-15
AD-301-1000-0 | BLOWER MOTOR REPLACEMENT KIT 110 VOLT ] 2 3 4
AD-301-2000-0 | BLOWER MOTOR REPLACEMENT KIT208-240 VOLT 2 3 a
AD-266-0000-0 | BLOWER MOTOR RETURN AIR GRATE | 2 3 +
WP-114-5R CASTER, 5" HEAVY DUTY RIGIR 2 2 2 2
WP-114-5S CASTER, 5" HEAVY DUTY SWIVEL W/BRAKE 2 2 2 2
AD-260-4000-0 | CONTACTOR - 2 POLE / 110 VOLT l 1 1 2
AD-260-2000-0 | CONTACTOR - 2 POLE / 208-240 VOLT 1 | 1 2
AD-260-3000-0 | СОМТАСТОК - 3 POLE / 208-240 VOLT (3PHASE) l 1 1 2
AD-264-0000-0 | CONTROL TOP MODULE COVER | 1 | 2
AD-312-0000-0 | CONTROL PANEL DECAL (BLUE) | 1 1 2
AD-417-0000-1 CONTROLLER ONLY 120 VOLT 1 l l 2
AD-417-0000-2 | CONTROLLER ONLY 208-240 VOLT l 1 ] 2
CONTROLLER COMPLETE 120VOLT ( INCLUDES
AD-247-2000-1 | POTENTIOMETER, PROBE & RELAY) 1 1 1 2
CONTROLLER COMPLETE 208-240 VOLT (INCLUDES
AD-247-2000-2 | POTENTIOMETER, PROBE & RELAY) 1 1 1 2
AD-161-2000-0 | CORD, 6FT 208-240 VOLT (NO PLUG) 1 1 2
AD-161-3000-0 | CORD, 6FT 208-240 VOLT (NO PLUG - MODEL 1200) 1
AD-161-1000-0 | CORD, 6FT 120 VOLT ( NO PLUG) ] 1 l 2
AD-265-1000-0 | DIVIDER BAR (FOR 1200-IS ONLY) 1
AD-263-1000-1 | DOOR, (NO HARDWARE) 1
AD-263-2000-1 | DOOR, (NO HARDWARE) 2
AD-263-3000-1 | DOOR, (NO HARDWARE) 1
AD-134-1000-1 | DOOR CATCH ONLY (NO HANDLE) | 1 2 2
AD-134-0000-0 | DOOR LATCH COMPLETE W/CATCH l 1 2 2
AD-280-1000-0 | ELEMENT, 1900 WATT 120 VOLT 2 3 N/A 6
AD-280-1000-0 | ELEMENT, 1900 WATT 208-240 VOLT 1 2 3 4
AD-305-1000-0 | FAN, COOLING MOTOR 120 VOLT 2 2 a 4
AD-305-2000-0 | FAN, COOLING MOTOR 208-240 VOLT 2 2 4 4
WITTCO MODEL NUMBER AND QUANTITY REQUIRED
PART NO. PART DESCRIPTION
7S0-IS 1000-IS 1200-IS 1400-IS
AD-253-0000-0 FAN SCREEN FOR COOLING MOTOR 2 2 4 4
AD-210-0000-0 FUSE HOLDER 2 2 2 4
AD-207-0000-0 FUSE, 3 AMPS 2 2 2 4
AD-142-750-E GASKET, DOOR ALUMINUM EXTRUSION 1
AD-142-1000-E GASKET, DOOR ALUMINUM EXTRUSION 2
AD-142-1200-E GASKET, DOOR ALUMINUM EXTRUSION 2
WP-302 GASKET, DOOR (BLACK) BY THE FT. 8 IP 21' 21'
AD-142-HT GASKET, HOT TOP /ORANGE 1 1 l 2
WP-111 HINGE, DOOR (1) 2 2 el A
LATCH, SPRING LOADED
AD-310-0000-0 (INCLUDES BOLTS FOR HOT TOP) A 4 4 8
WP-040 LIGHT, INDICATOR ROUND 125 VOLT 3 3 3 6
AD-226-0000-0 LIGHT, INDICATOR ROUND 250 VOLT 3 3 3 6
AD-416-0000-0 POTENTIOMETERS (SET/2) 1 1 | 2
AD-242-0000-0 POTENTIOMETER KNOBS 2 2 2 4
AD-246-0000-0 PROBE 1 1 1 2
AD-291-5000-0 RACKS, INT. SIDE UPRIGHT
AD-291-2000-0 RACKS, INT. SIDE UPRIGHT 4 8
AD-291-3000-0 RACKS, INT. SIDE UPRIGHT 8
WP-305 RACK, SIDE RETAINING BOLTS 8 8 16 16
RELAY - 120 VOLT
AD-415-2000-0 (SWITCHING CUBE TYPE - CLEAR) l 1 | 2
RELAY - 208-240 VOLT
AD-415-1000-0 (SWITCHING CUBE TYPE - SMOKE BLACK) l 1 1 2
AD-419-0000-0 SECURITY COVER - CLEAR l l | 2
AD-252-0000-0 STRAIN RELIEF AT POWER CORD | l 1 2
AD-135-0000-0 SUPPRESSOR (ORANGE) 2 2 2 5
AD-212-0000-0 SWITCH, ON/OFF ROCKER l 1 | 2
AD-244-0000-0 SWITCH, START PUSH BUTTON 1 1 1 2
AD-206-2000-0 TERMINAL BLOCK, INTERNAL DISTRIBUTION 1 ] 2
AD-206- 1000-0 TERMINAL BLOCK - POWER CONNECT 1 1 1 2
AD-241-1000-0 THERMOSTAT - HI LIMIT l 1 1 2
AD-251-0000-0 THERMOSTAT FOR COOLING MOTOR | 1 1 2
WITTCO
MODEL NUMBER AND QUANTITY REQUIRED
PART NO. PART DESCRIPTION
750-IS 1000-IS 1200-IS 1400-IS
AD-232-2000-0 TIMER - ATC 120 VOLT ] ] | 2
AD-232-1000-0 TIMER - ATC 208-240 VOLT | | | 2
AD-235-0000-0 TIMER BUTTONS (SET OF 3) ] 1 ] 2
WP-291 TRAY SLIDES(Pr.) 5 8 16 16
AD-267-2000-0 TUNNEL, AIR FLOW | 2
AD-267-3000-0 TUNNEL, AIR FLOW |
AD-267-1000-0 TUNNEL, AIR FLOW ]
CONTROL MODULE (COMPLETE TOP) 120 VOLT
750-T-C-IS OR 208-240 VOLT 1PHASE ]
CONTROL MODULE (COMPLETE TOP) 120 VOLT 2
1000-T-C-IS OR 208-240 VOLT IPHASE |
CONTROL MODULE (COMPLETE TOP)
1200-T-C-IS 208-240 VOLT 1PHASE 1
F-41001