TurboChef HHB-8028 User manual

Accelerating the World of CookingTM
High h Batch Service Manual
      
800.90TURBO
Part Number: HHB-8707/Revision A/June 2005

For further information call:
Customer Service at .
Sales & Marketing at .
Accelerating the World of CookingTM

The information contained in this manual is important for the proper installation, use, maintenance,
and repair of this oven. Follow these procedures and instructions to ensure satisfactory baking results and
years of trouble-free service.
Errors – descriptive, typographic, or pictorial – are subject to correction. Specifications are subject to
change without notice.
PLEASE CAREFULLY READ THIS MANUAL AND RETAIN IT FOR FUTURE REFERENCE.

Safety Instructions
Important Safety Information – Please Read First i
General Safety Information i
Reducing Fire Risk i
Preventing Oven Damage ii
Grounding Instructions ii
Power Cord Replacement ii
Theory of Operation, Specifications and Installation
Theory of Operation 1
Certifications 1
Dimensions 1
Construction 2
Electrical Specifications 2
North America (except Canada)/South America 2
Canada 2
Europe/Asia/Pacific 2
United Kingdom/Ireland 2
Installation 2
Lifting and Placing the Oven 2
Setup 3
Operating the Oven
Control Display and Key Identification 5
Oven States and Menu Access 5
Oven State Descriptions 5
Menu Descriptions 6
Powering Up 6
Powering Down 6
Cooking Instructions 6
Cooking Options 7
Time Screen Options 7
Done Screen Options 7
Using the Options Menu 8
Enabling/Disabling the Edit Menu 8
Erasing the Recipe Menu 9
Enabling/Disabling the Write Card Function 9
Enabling/Disabling the Time Screen 10
Enabling/Disabling the Done Screen 10
Enabling/Disabling the Demonstration Mode 11
Table of Contents

Programming Recipes 11
Adjusting the Cook Chamber Temperature 12
Modifying Recipes 12
Loading Menu from Smart Card 14
Saving Menu to Smart Card 14
Checking Recipe Counter 16
Diagnosing an Issue
Fault Codes: Descriptions, Clearing Instructions, 17
and Troubleshooting
F1: BLOWER (Blower Running Status Bad) 17
F2: LOW TEMP (Cook Temperature Low) 17
F6: EC TEMP (Electrical Compartment Temperature High) 20
F7: THERMO (Thermocouple Open) 20
F8: HEAT LOW (Heat Rise Low) 20
Status Indicators 23
Door 23
Heater A 23
Heater B 23
Blower 23
Testing Options 23
Testing the Blower Motor 24
Viewing/Clearing the Fault Log 24
Adjusting Temperature Offset 24
Checking Heaters A and B 25
Testing the Rack Oscillator 27
Enabling/Disabling Diagnostic Mode 27
Viewing Cook Counter/Time 27
Viewing Cumulative Operating Time 28
Viewing EC Temperature 28
Changing Fahrenheit/Celsius Option 29
Viewing/Entering Serial Number 29
The Control System
Serviceable Components 31
Blower Motor Controller 32
Cooling Fans 33
Display 34
Display Keypad 35
Door Switch 36
Fuses 37
I/O Control Board 39
Power Supply 39
Relay 39
Smart Card Reader 39
Solid State Relay 40

Rack Oscillator Motor 40
Thermocouple – Cook Chamber 42
Thermocouple – Electrical Compartment 42
Thermostat – Cooling Fan 43
Thermostat – Hi-Limit 44
Voltage Sensor 45
Troubleshooting 46
No Keypad Input 46
No Display – Screen is Blank 47
The Oven Door
Serviceable Components 49
Door Gasket 50
Door Hinge 51
Door Switch 51
Troubleshooting 52
“Cook Door Open” Message when Door is Closed 52
The Impingement Circuit
Serviceable Components 53
Blower Motor 53
Heater Element 54
Jetplates (Top and Bottom) 55
Swing Arm Assembly 56
The Filtering System
Serviceable Components 57
Catalytic Converter 57
Filters 58
Cleaning the Oven
Daily Maintenance Procedures 59
Deep Clean Procedures 59
High h Batch Schematic
High h Batch Oven Schematic 61
Schematic Parts 63
I/O Control Board Test Point Locations 64
Comprehensive Part Listing
Comprehensive PartListing 65
Hardware Descriptions 69
Glossaryof Terms
Subject Index

i
SAFETY INSTRUCTIONS
IMPORTANT SAFETY INFORMATION – PLEASE READ FIRST
Improper installation, adjustment, alteration, service, or maintenance of this equipment can cause property
damage, injury, or death. Thoroughly read the installation, operating, and maintenance instructions before
installing or servicing this equipment. Strictly adhere to the following safety information to reduce the
risk of:
oDamage to the oven
oDamage to property near the oven
oPersonal injury
oBurns
oFire
oElectric shock
GENERAL SAFETY INFORMATION
oUse this appliance only for its intended uses as described in this manual.
oOnly qualified service personnel should service this appliance. Contact the nearest authorized service
facility for examination, repair, or adjustment.
oAlways ensurethe oven is disconnected from the power supply before servicing, repairing, or adjusting
any components or parts.
o
xDO NOT place the cord near heated surfaces.
o
xDO NOT store or use flammable vapors or liquids (e.g., gasoline) in the vicinity of this appliance.
o
xDO NOT allow children to use this appliance.
o
xDO NOTplace corrosive chemicals or vapors in this appliance. It is not designed for industrial or
laboratory use.
o
xDO NOT operate this appliance if it
Has a damaged cordor plug
Isnot working properly
Has been damaged or dropped
o
xDO NOT cover or block any openings on this appliance.
o
xDO NOT store this appliance outdoors.
o
xDO NOT use this appliance near water.
o
xDO NOT immerse this appliance or any of its components (e.g., cord, plug, etc.) in water.
o
xDO NOT let the cord hang over the edge of a table or counter.
REDUCING FIRE RISK
Ifmaterials inside the oven ignite or if smoke is observed,
1. Keep the oven door closed.
2. Turn off the oven.
3. Disconnect the power cord or shut off power at the fuse/circuit breaker panel.
oCarefully attend the oven if paper, plastic, or other combustible materials are placed inside the oven
to facilitate cooking.
o
xDO NOT leave items in the Cook Chamber when the oven is not in use.
o
xDO NOT cook items wrapped in cling wrap or plastic film.
o
xDO NOTovercook food.

ii SAFETY INSTRUCTIONS
PREVENTING OVEN DAMAGE
oWhen servicing this appliance, do not tear insulation to get to components. Rather, find the edge of
the insulation and remove the tape that holds it in place.
oOperate the oven only when food is in the Cook Chamber.
oClean the oven daily.
oClean the oven only with TurboChef Oven Cleaner.
o
xDO NOT clean with a water jet.
o
xDO NOT slam or mishandle the oven door.
o
xDO NOT frequently open and close the door to check the cook status of the food.
o
xDO NOT allow cleaning solution or water to remain in the Cook Chamber longer than necessary.
GROUNDING INSTRUCTIONS
WARNING: Improper grounding increases the risk of electric shock.
This appliance must be grounded. It is equipped with a cord that has a grounding wire and plug that,
in the event of an electrical shortcircuit, reduce the risk of electric shock by providing an escape wire for
the electric current. The wiremust be plugged into an outlet that is properly installed and grounded.
Consult a qualified electrician or serviceman for help understanding
oGrounding instructions
oWhether or not the appliance is properly grounded
o
xDO NOT use an extension cord. If the power supply cord is too short, request a qualified electrician
or serviceman to install an outlet near the appliance.
POWER CORD REPLACEMENT
Toavoid potential hazards, only the manufacturer, its service agent, or a similarly qualified person should
replace a damaged power cord.