Blodgett accellis C70 Installation and operating manual

BLODGETT OVEN COMPANY
www.blodgettcorp.com
50 Lakeside Avenue, Box 586, Burlington, Vermont 05402 USA Telephone [phone] Fax: [phone]
PN T0582 Rev F (3/01)
E2000 --- G.S. Blodgett Corporation
C70
CONVECTION MICROWAVE OVEN
SERVICE AND REPAIR MANUAL

TABLE OF CONTENTS
READ THIS FIRST i.........................................................
Important Safety Instructions ii...............................................
Precautions to Avoid Possible
Exposure to Excessive Microwave Energy iii....................................
Precautions to be Observed Before and During
Servicing to Avoid Possible Exposure to Excessive Microwave Energy iv...........
Grounding Instructions v.....................................................
RF Interference Considerations vi.............................................
Section 1 Installation Specs
Oven Description 1 --- 1....................................................
Installation 1---1.........................................................
Section 2 Cleaning & Operating
Basic Cleaning Procedures 2---1...........................................
Oven Cavity Filter Cleaning 2---2...........................................
Glossary of Common Operating Terms & Error Messages 2---3................
Operational Flow Chart 2---4..............................................
Programming Flow Chart 2---6.............................................
Section 3 Test
Test Function Quick Reference 3---1........................................
Test Function Detailed Description 3---2.....................................
Section 4 Electrical Compartment
Key Sequence of Operation --- Failure Mode Analysis 4---1....................
Electrical Component Locations 4---2.......................................
Electrical Component Description with Voltage Information 4---3...............
Door Switches and Circuit Breakers 4---5...................................
Door Switch Adjustment 4---6.............................................
Door Removal and Replacement 4---9......................................
C70 Schematic 4---12.....................................................
Section 5 Convection Circuit
Catalytic Converter 5---1..................................................
Convection Element and Thermocouples 5---2...............................
Thermoelectric Voltage in Millivolts --- Type K Thermocouple 5---3...........
Convection (Blower) Motor Operation 5---4..................................
Blower Motor Controller Fault Codes & Troubleshooting 5---5..................

TABLE OF CONTENTS
Section 6 Microwave Circuit
Measuring for Microwave Radiation Leakage 6---1...........................
Magnetron Circuit 6---2...................................................
Magnetron Testing 6---3..................................................
Magnetron Removal and Replacement 6---3.................................
Component Testing 6---4..................................................
Transformer Specifications 6---5...........................................
Control Circuit Board 6---6................................................

i
READ THIS FIRST
TECHNICAL SUPPORT PHONE NUMBER
1-888-992-6624
This Service and Repair manual is set up for use by qualified technicians only. If you are unfamil-
iarwiththisoven,callthefactoryatthetollfreenumberabovefor technicalassistance.Technical
support can be reached 24 hours a day, seven days a week.
Before working on the Acellis C-70 oven you must first read the safety instructions on the following
pages. The Accellis C-70 is a combination convection/microwave oven. While servicing this oven, an
RFmetermustbeusedatalltimestocheckformicrowaveleakage.ThisRFreadingmustberecorded
on your work invoice.
Very often poor cleaning will result in microwave leakage. Please refer to the first two sections of this
manual (INTRODUCTION and CLEANING & OPERATION) for information on the proper cleaning pro-
cedures.
Before removing the metal skin to access the electrical components in this oven, the power must be
shut off and the oven unplugged. Wait at least one full minute before removing the oven skin so that
themagnetroncircuit canself-discharge.FAILURETODOSOMAYRESULTINDEATHORSERIOUS
INJURY.
This oven has a one time registration feature on initial start-up. The Accellis C-70 will not operate until
you have called and registered the oven location andphone numberwith technicalsupport. Upon reg-
istration, an access code will be issued. Be sure that you have the location of the installation site and
phonenumberbeforecallingforregistration.
This manual is divided into seven (7) chapters as follows:
1. INSTALLATION SPECS --- This chapter includes oven specifications and the parameters for
proper installation.
2. CLEANING & OPERATION --- Improper cleaning can and will affect the operation of this oven. This
chapter includes a brief description of the cleaning and operation pro-
cedures of the oven and the procedure to edit or change a cooking
program.
3. TEST --- This chapter details the Test Mode, which allows the technician to
operateindividualcomponentsorsectionoftheAccellisC-70oven.
Using this feature will isolate most electrical troubleshooting
problems.
4. ELECTRICAL COMPARTMENT --- This chapter identifies the electrical compartment componentsand
providesvoltageinformation.Usethekeytohelpisolateelectrical
troubleshooting problems.
5. CONVECTION &
CATALYTIC CONVERTER --- This chapter provided information on the convection and blower
motorspeedcontrol.Removalandcleaningofthecatalyticconvert-
er are also provided.
6. MICROWAVE CIRCUIT --- This chapter includes information on the microwave circuit and stir-
rer motor.

ii
SAVE THESE INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
WHEN USING ELECTRICAL APPLIANCES, THE FOLLOWING
BASIC SAFETY PRECAUTIONS SHOULD BE STRICTLY ADHERED TO:
WARNING!!
To reduce the risk of burns, electric shock, fire, injury to persons or exposure to excessive
microwave energy:
7. Read all instructions before using the appliance.
8. Read and follow the specific PRECAUTIONS TO AVOID POSSIBLEEXPOSURE TOEXCESSIVE
MICROWAVE ENERGY found on page iii.
9. This appliance must be grounded. Connect onlyto properlygrounded outlet. See GROUNDING
INSTRUCTIONS found on page iv.
10. Install or locate this appliance only in accordance with the provided installation instructions.
11. Some productssuchaswhole eggs and sealed containers --- for example, closed glass jars --- may
explode and SHOULD NOT be heated in this oven.
12. Use this appliance only for its intended use as described in the manual. DO NOT use corrosive
chemicals or vapors in this appliance. This type of oven is specifically designed to heat, cook, or
dry food. It is NOT designed for industrial or laboratory use.
13. Children SHOULD NOT use this appliance.
14. DO NOT operate this appliance if it has a damaged cord or plug, if it is not working properly, or if
it has been damaged or dropped. See POWER SUPPLY CORD REPLACEMENT found on page
iv.
15. This appliance should be serviced only by qualified service personnel. Contactthe nearest autho-
rized service facility for examination, repair or adjustment.
16. DO NOT cover or block any openings on the appliance.
17. DO NOT store this appliance outdoors. DO NOT use this product near water --- for example, near
a kitchen sink, in a wet basement, or near a swimming pool.
18. DO NOT immersecordorpluginwater.
19. Keep cord away; from heated surfaces.
20. DO NOT letcordhangoveredgeoftableorcounter.
21. DO NOT useawaterjetforcleaning.
22. See the Maintenance section of this manual.
23. To reduce the risk of fire in the oven cavity:
a.) DONOTovercook food. Carefully attend applianceif paper, plastic, orother combustible mate-
rials are placed inside the oven to facilitate cooking.
b.) Removewiretwist---tiesfrompaperorplasticbaginoven.
c.) If materials inside theovenshouldignite, keep oven door closed, turn oven off, and disconnect
thepowercord,orshutoffpoweratthefuseorcircuitbreakerpanel.
d.) DONOTusethecavityforstoragepurposes.DONOTleavepaperproducts, cookingutensils,
or food in the cavity when not in use.

iii
SAVE THESE INSTRUCTIONS
PRECAUTIONS TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
1. DO NOT attempt to operate this oven with the door open since open---door operation can result
inharmfulexposuretomicrowaveenergy.Itisimportantnottodefeatortamperwiththesafetyinter-
locks.
2. DO NOT place any object between the oven front face and the door or allow soil or cleaner residue
to accumulate on the sealing surfaces.
3. DONOToperatetheoven ifitisdamaged. Itisparticularlyimportant thatthe ovendoor closeprop-
erly and that there is no damage to the:
a.) Door (bent).
b.) Hinges and latches (broken or loosened).
c.) Door seals and sealing surfaces.
4. The oven SHOULD NOT be adjusted or repaired by anyone except properlyqualified service per-
sonnel.

iv
SAVE THESE INSTRUCTIONS
PRECAUTIONS TO BE OBSERVED BEFORE
AND DURING
SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
1. DO NOT operate or allow the oven to be operated with the door open.
2. Make the following safety checks on all ovens to be serviced before activating the magnetron or
other microwave source, and make repairs as necessary:
a.) Interlock operation.
b.) Proper door closing.
c.) Seal and sealing surfaces (arcing, wear, and other damage).
d.) Damage to or loosening of hinges and latches.
e.) Evidence of dropping or abuse.
3. Beforeturningonmicrowavepowerforanyservicetestorinspectionwithinthemicrowavegenerat-
ing compartments, check the magnetron, wave guide, or transmission line, and cavity for proper
alignment, integrity, and connection.
4. If the oven is operative prior to servicing, a microwave emission check should be performed prior
to servicing the oven. Refer to page NO TAG of this manual for microwave leakage testing proce-
dure.
5. Any defective or mis-aligned components in the interlock, monitor, door seal, and microwave gen-
eration and transmission systems shall be repaired, replaced, or adjusted by procedures de-
scribed in this manual before the oven is released to the owner.
6. A microwave leakage check to verify compliance with the Federal Performance Standard MUST
BE performed on each oven prior to release to the owner. Refer to page NO TAG of this manual
for microwave leakage testing procedure.

v
SAVE THESE INSTRUCTIONS
GROUNDING INSTRUCTIONS
This appliance MUST BE grounded. In the event of an electrical short circuit, grounding reduces the
risk of electric shock by providing an escape wire for the electric current. This appliance is equipped
with a cord having a grounding wire with a grounding plug. The plug must be plugged into an outlet
that is properly installed and grounded.
WARNING!!
Improper use of the grounding can result in a risk of electric shock.
Consult a qualified electrician or serviceman if the grounding instructions are not completely under-
stood, or if doubt exists as to whether the appliance is properly grounded.
DO NOT use an extension cord. If the power supply cord is too short, have a qualified electrician or
serviceman install an outlet near the appliance.
POWER SUPPLY CORD REPLACEMENT
If the power supply cord is damaged, it MUST BE replaced by the manufacturer or its service agent
or a similarly qualified person in order to avoid a hazard.

vi
SAVE THESE INSTRUCTIONS
RF INTERFERENCE CONSIDERATIONS
This oven generates radio frequency signals. This device has been tested and determined to be in
compliance with applicable part of FCC part 18 requirements and to the protection requirements of
CouncilDirective89/336/EEContheapproximationofthe lawsoftheMemberStatesrelatingtoelectro-
magnetic compatibilityat the time ofmanufacture. However, someother equipmentmay exhibitsensi-
tivity to signals below these limits resulting in interference with that equipment.
If your equipment experiences interference, the following steps should be considered:
1. Increase the physical separation between this oven and the sensitive equipment.
2. If the sensitive device can be grounded, do so following accepted grounding practices.
3. If battery powered microphones are being affected, insure that the batteries are fully charged.
4. Keep sensitive equipment on electrically separate circuits, if possible.
5. DO NOT route intercom wires, microphone wires, or speaker cables near oven.

INSTALLATION SPECS
CHAPTER 1

ACCELLIS C70
1 --- 1
OVEN DESCRIPTION
SPECIFICATIONS C70
Dimensions (single unit) 29” W x 21.5” H x 32.25” D (74.9 cm x 54.6 cm x 81.9 cm)
Maximum Input 8.0 KW/Hr.
Power Supply 208 VAC, 50/60 Hz, 1Ô, 39 amp,3 wire including ground
240 VAC, 50/60 Hz, 1Ô, 36 amp,3 wire including ground
Microwave Frequency 2.45 GHz
Connections including ground The unit is supplied with a 6’ power cord with an approvedplug.
The outlet box, receptacle and wall plate are to be furnished by
the installing contractor.
Maximum Power Usage
Convection Oven
Microwave Oven
5Kw
2Kw
TABLE 1
INSTALLATION
The Blodgett Accellis oven is manufactured to
comply with applicable CE, UL, CUL, FDA, and
FCCrequirements.Inaddition,theunitisULclassi-
fied to NSF 4. All equipment is designed and certi-
fied for safe operation when installed in accor-
dance with local and or nationalcodes. Manylocal
codes exist, and it is the responsibility of the owner
and installer to comply with these codes.
In no event shall the manufacturer assume any li-
ability for damages or injury resulting from installa-
tions which are not in compliance with the instruc-
tionsandcodeslistedabove.
WARNING!!
DEATH, INJURY, AND EQUIPMENT DAM-
AGE could resultfrom improperinstallation
of this oven or installation of a unit which
has been damaged during shipment or
storage. Either of these conditions could
void the equipment warranty.
DO NOT INSTALL an oven suspected of
damage.
INSTALL this oven according to the poli-
cies and procedures outlined in this
manual.
OVEN LOCATION
The well planned and proper placement of your
oven will result in long term operator convenience
and satisfactory performance.
Besuretoplacetheoveninanareawhichisacces-
sible for proper operation and servicing.
The countertop or work surface must be able to
support the weight of 200 pounds. The manufac-
turer shallnot assume liability for damage or injury
resulting from improper installation of equipment
including temporary or unstable work stations or
countertops.
There must be 2” (5.08 cm) between the top of the
unit and any shelf or other surface.
The oven must be installed level front to back and
side to side. The oven legs may be bolted to the
counter top if desired.

CLEANING & OPERATING
CHAPTER 2

ACCELLIS C70
2 --- 1
BASIC CLEANING PROCEDURES
PROBLEMS ASSOCIATED WITH IMPROPER
CLEANING
The Accellis C70 oven may not be operating cor-
rectly because it is not being cleaned properly. If
thedoorisleakingmicrowaves,erraticoperationof
the display and other electrical components can
occur. Also food deposits left in the oven will turn
into black carbon from the high heat. Carbon can
cause arking inside the cooking area and can re-
flect energy back to the magnetron.
If a customer tells you they are experiencing cook-
ing performance problems, carefully inspect the
cooking platter and waveguidecap forchips. If the
platter or waveguide cap are chipped and soaked
in water, they will absorb the water. The water will
then be heated instead of the food product. The
chipped part must be replaced.
DAILY CLEANING
1. Carefully remove the ceramic cooking platter
and wave-guide cap. Spray both pieces gen-
erously with non-lye non-caustic oven cleaner
or non-lye non-caustic degreaser and set
aside to allow the cleaner to penetrate. DO
NOT soak the Ceramic Cook Platter or Wa-
veguide Cap in water.
2. Clean the ceramic cooking platter, and wave
guide cap using brushes and scrub pads.
Rinsetoremoveallcleaneranddebris.Inspect
for damage and replace as required.
3. Reinstall the clean wave-guide cap into the
oven. This will protect the wave-guide seal
whilethecookchamberiscleaned.
4. To clean the interior of the oven, use a 3”x5”
green scrub pad. Use a non lye based cleaner
on tough spots. DO NOT wash out the interior
cooking area. The waveguide quartz seal is
not a water tight seal. Wipe out the oven with
a damp rag. If the door area needs cleaning,
becarefulnottodamagethesmallrubbergas-
ket around the door shunt area.
5. Remove the lower access panel and grease
collection pan. Empty, clean and reinstall the
pan.
6. Verify the louvers on the front and side of the
oven are clean of lint and unobstructed.
MONTHLY CLEANING
1. Remove and clean the exhaust cover from the
back of the oven.
Cook Platter
Waveguide
Cap
Grease
Tray Lower Access
Panel
Exhaust
Cover
FIGURE 1

CLEANING & OPERATING
2 --- 2
OVEN CAVITY FILTER CLEANING
Filter should be cleaned once a week, depending
on food product and unit run time.
1. Turn the C70 off and disconnect power to the
unit.
2. Allow the unit to cool before cleaning the filter.
3. Open the oven door.
4. Carefully remove the ceramic platter.
5. The oven cavity filter is located in the bottom
left corner.
6. Remove the two screws.
7. Pull the two tabs on the filter to remove it.
8. Clean the filter with soap and warm water.
9. Clean the oven filter cavity.
DO NOT reach into the air return more than
six inches.
10. Reinstall the filter and secure with the two
screws.
DO NOT over tighten the screws.
WARNING!!
DO NOT operate the unit without the
oven filter installed. Failure to do so
may result in premature failure of the
heater element.
Filter
Screws Screws
Tabs
Filter
Tab
Tab
FIGURE 2

ACCELLIS C70
2 --- 3
GLOSSARY OF COMMON OPERATING TERMS & ERROR MESSAGES
OVEN OPERATING COMPONENTS
Display --- Primary interface to relay messages to
the operator.
Keypad --- Primary interface for the operator to
control the oven.
Cook Chamber --- Cavity in which the food prod-
ucts are cooked.
PRODUCT RECIPES
Recipe --- The food product recipe programming
consistsoftime,percentageofhotairflow(AIR)re-
quired and microwave (MW) level required.
Cook Cycle --- Time of operation for a recipe.
Cook Event – Segment of a recipe, up to 6 events
can be used for each recipe.
Duration --- Time, in seconds, of a single cook
event.
Air --- Percent of convection air flow during a cook
event.
MW --- Percent of microwave used during a cook
event.
Cook Temperature Set Point --- Temperature
should be a constant parameter. The same cook
temperature should be used by all cook recipes.
MODES
Mode – The software environment which allows
certain operations to occur. There are several
modes, STANDBY, COOK, WARM UP and COOL
DOWN in which the oven can operate.
Standby Mode --- The standby mode is similar to
oven off. In standby there is no power to the oven.
There is power to the control, however, the oven
will not operate in standby mode.
Cook Mode --- Mode used to perform the normal
oven operations, such as, monitor the key pad for
requests to cook or change mode, and maintain
the oven at the cook temperature set point.
Warm-Up Mode --- Mode to bring the oven up to
the cook temperature set point.
Cool-Down Mode --- Turns off all oven components
except the cooling fan and circulation blower.
ERROR MESSAGES
LO MAG CURR – the magnetron transformer is
drawing less than 7 amps. The normal current
draw is approximately 9 amps. The current draw is
beingmonitoredbythecontrolboardwhich hasan
inductance ring on it.
LO COOK TEMP – thetemperature set for theC70
is not being maintained. It is referenced by two J
type thermocouples.
MAG OT – the snap disk on the magnetron has
overheated and has tripped.
BLOWERSTAT –thecontrolboardisnotreceiving
the proper output from the convection (blower)
motor speed control.
LO MAG FLUX – there is a small antenna in the
launch tube of the wave guide. This antenna or RF
cable is attached to the control circuit board. The
control circuit board amplifies the signal and looks
foracertainfluctuationwhichindicatesthemagne-
tron is operating and the stirrer blade in the launch
tube is rotating. When not cooking a minimum
change of 20 is being looked for. When you are
cooking a product a minimum change of 10 is be-
ing looked for. When viewing the RF display, it will
fluctuatequicklywithamaximumvalueof120(plus
or minus 20).
ELECTOVR TMP – the j type thermocouple con-
nected to the control board is above 140_F.
OVEN DOOR OPEN – (during cook cycle) the
cooking door has been opened during a cook
cycle and has not been closed properly.

CLEANING & OPERATING
2 --- 4
OPERATIONAL FLOW CHART
When finished
display reads
DONE
Please remove
food from oven
Cooking begins
Display reads
XX:XX
COOKING
MENU
SUBMENU
Display reads
SET TEMP XXX
PRESS ENTER
Press soft key
next to OVEN ON
(to right of display)
Display reads
OVEN OFF
START
(Blank Display if off
for over one hour)
Press any key
to initialize
The oven will
default to the
programmed temperature
if no change
is entered.
Display reads
COOLING DOWN Display reads
WARMING UP
Press soft key to
select menu.
If oven
temp
low
If oven
temp
high
Press soft key
to pick submenu.
UsetheARROW keys to change
the temperatue. The range is
between 350
_ F and 520 _ F
in 25
_ increments).
Press ENTER to
accept value.
Display reads
READY TO COOK
(oven beeps)
(oven to set temp) Press
STOP key
A
B
Open Door
Cook More
If the oven has
been used in
the last hour,
proceed to
here.
See
next
page
See
next
page

ACCELLIS C70
2 --- 5
Press RESUME
to continue
Display reads
PAUSE
GROUP
ITEM
RESUME
If the door is open during
the cook cycle
Press key to right
or left of desired
cook option
Display reads
COOK MORE
BROWN MORE
COOK & BROWN
If you do not press the stop key you can
cook the product more if it is not done
B
A
COOK MORE --- Microwave only
BROWN MORE --- Convection only
COOK & BROWN --- Microwave & Convection
Use the
arrows keys
to set the time
(20 sec increments)
FIGURE 3

CLEANING & OPERATING
2 --- 6
PROGRAMMING FLOW CHART
Enter Access code
8317
then press ENTER
Press BACK key
until the display
reads OVEN OFF
Display reads
ENTER ACCESS
CODE
Press the
ARROW keys
at the same
time for 3 seconds
<GROUP>
Use the number/letter keys to
enter the desired menu name.
NOTE: Curser under
selected letter.
UNLOCKS DISPLAY
CURSER & MOVEMENT KEY
NOTE: 1. Curser under figure indicates it is selected.
2. Curser advances to next figure after 3 seconds.
3. Use left or right soft key to select figure if you
make a spelling mistake.
4. Use UP or DOWN arrow keys to advance to any
desired line item.
5. Save,testorusebackkeytoexitwhenfinished.
%AIR
1 00:00 0 0
2 00:00 0 0
3 00:00 0 0
4 00:00 0 0
5 00:00 0 0
6 00:00 0 0
SAVE
GROUP A
ITEM 1
SET TEMP XXX
TEST
Press soft key next
to display you wish
to change.
<ITEM>
Use the number/letter keys to
enter the desired submenu
name.
<SET TEMP>
(350_to 525_)
in 25_increments
TIME
XX:XX %AIR XXX
TIME %WAVE
%WAVE
XXX1
A. Set time from 00:01 to
59:59. Setting the time
to00:00willendtherecipe.
B. Set % of blower speed
from 10% to 100% in 10%
increments.
C. Set % of microwave
from 10% to 100% in 10%
increments.
D. You can program up to 6
events per item. When an
event is finished, the next
one begins. Set a zerotime
to end a programmed
event.
Press SAVE. (TEST runs
program without saving it.)
Press BACK key to exit
program mode.
L1
L2
L3
L4
R1
R2
R3
R4

TEST
CHAPTER 3

ACCELLIS C70
3 --- 1
TEST FUNCTION QUICK REFERENCE
Press the
BACK & ENTER
keys at the same
time for 3 seconds
Display reads
ENTER ACCESS
CODE
Select XXX code
and
press ENTER
UNLOCKS DISPLAY
Press the BACK
key
until the display
reads
OVEN OFF.
FIGURE 1
The test function allows the technician to operate
components individually and get diagnostic
information. There are 2 pages of test functions.
To change pages use the DOWN ARROW key.
Refer to the brief descriptions on this page to help
determine which test function will help you. Before
operating a test function, read the full description
of the test function on these following pages.
DISPLAY PAGE 1
CCXX --- thermocouple cooking cavity temperature
BLOWER–runstheblowermotorin10%increments
ELEC–thermocoupleelectricalcompartmenttem-
perature
STEST – initiates the self test function
HXXX – thermocouple heat exchanger temperature
HEATER -- turns on HOT AIR heater element
MGTRON – (press & hold) runs the magnetron circuit
DIAG – runs the cooking display w/status indica-
tors at the bottom of the display
DISPLAY PAGE 2
CCXX --- thermocouple cooking cavity temperature
HXXX – thermocouple heat exchanger temperature
S/N – for entering the serial number of the C70
CCC --- number of cook cycles
PIN – enters a new 3 digit password number
F/C -- Fahrenheit or Celsius temperature display
FF – view and reset cook fault counters
IAF – allows you to view or change the Idle Airflow