HOUNO B Series User manual

HOUNÖ
SERVICE MANUAL - English
B, C & K Visual Cooking Models (Gas & Electric)
Software Version 3.51 - 04 /2019
CAUTION: Read these instructions before servicing the oven

2 SERVICE MANUAL REVISION 04/19, SW: 3.51
Introduction 5
Utility Connections 6
Standards and codes 7
Important Safety Information 8
Safety Instructions 9
Operation panel 11
Settings 12
Description of Functions 15
Hot Air 15
Menu table 21
Setup menu 22
User menu 24
TEST Menu 27
Cleaning 35
Water layout 38
I/O board led 40
Frequency inverter 41
Error Codes 42
Troubleshooting ERROR CODES 44
TABLE OF CONTENTS

SERVICE MANUAL 3
REVISION 04/19, SW: 3.51
GAS Burner Electrode Adjustments 62
Gas Pressure 64
Gas Burner Settings 65
Changing type of gas 68
Switch adjustment 69
Gas Sequence Diagram 70
Gas Components 71
Identifying parts 74
Error codes on Dungs’ Control Box 75
PT 100 table 79
SERVICE AND REPAIR 80
Safety 80
warranty 80
TABLE OF CONTENTS

4 SERVICE MANUAL REVISION 04/19, SW: 3.51

INTRODUCTION
SERVICE MANUAL 5
REVISION 04/19, SW: 3.51
INTRODUCTION
Dear technician,
This service manual contains all the information you need to service and maintain a
Visual Cooking combi oven from HOUNÖ.
We recommend that you read both the manual and familiarize yourself with the service
settings and functions of the oven. This will ensure optimal cooking and baking results
and safety.
Please make the manual available to all who service and maintain the oven and retain it
for future reference.
The latest version of the manual can be downloaded from www.houno.com.
Note that this document is subject to change without notice.

UTILITY CONNECTIONS
6 SERVICE MANUAL REVISION 04/19, SW: 3.51
IMPORTANT
WARNING: Improper
installation, adjustment,
alternation, service or
maintenance can cause
property damage, injury
or death. Read the
installation, operation
and maintenance
instructions
thoroughly before
installing or servicing this
equipment.
INSTRUCTIONS TO
BE FOLLOWED IN THE
EVENT THE USER
SMELLS GAS MUST
BE POSTED IN A
PROMINENT LOCATION.
This information may be
obtained by contacting
your local gas supplier.
FOR YOUR SAFETY
Do not store or use
gasoline or other
flammable vapors or
liquids in the vicinity
of this or any other
appliance.
The information
contained in this manual
is important for the
proper installation, use,
and maintenance of
this oven. Adherence to
these procedures and
instructions will result
in satisfactory baking
results and long, trouble
free service. Please read
this manual carefully
and retain it for future
reference.
ERRORS: Descriptive,
typographic or pictorial
errors are subject to
correction. Specifica-
tions are subject to
change without notice.
UTILITY CONNECTIONS
THE SERVICE INSTRUCTIONS CONTAINED HEREIN ARE FOR THE USE OF QUALIFIED
INSTALLATION AND SERVICE PERSONNEL ONLY. INSTALLATION OR SERVICE BY OTHER
THAN QUALIFIED PERSONNEL MAY RESULT IN DAMAGE TO THE OVEN AND/OR INJURY
TO THE OPERATOR.
Qualified service/installation personnel are individuals, a firm, a corporation, or a
company, which either in person or through a representative are engaged in, and
responsible for:
• The service/installation or replacement of gas piping and the connection, instal-
lation, repair or servicing of equipment.
• The installation, repair or service of electrical wiring from the electric meter,
main control box or service outlet to the electric appliance.
• Qualified installation/service personnel must be experienced in such work,
familiar with all precautions required, and have complied with all requirements of
state or local authorities having jurisdiction.

STANDARDS AND CODES
SERVICE MANUAL 7
REVISION 04/19, SW: 3.51
STANDARDS
AND CODES
U.S. and Canadian installations
The installation must conform with local codes, or in the absence of local codes, with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane
Installation/service Code, CSA B149.1, as applicable.
Installation/service must conform with local codes, or in the absence of local codes, with
the National Electrical Code, ANSI/NFPA 70-Latest Edition and/or Canadian National
Electric Code C22.1 as applicable.
Appliance is to be installed with back flow prevention in accordance with applicable
federal, province and local codes.
Australia and general export installations
Installation must conform with Local and National installation standards. Local
installation codes and/or requirements may vary. If you have any questions regarding
the proper installation, service, repair and/or operation of your HOUNÖ oven, please
contact your local distributor. If you do not have a local distributor, please call the
HOUNÖ Oven Company at [phone].

IMPORTANT SAFETY INFORMATION
8 SERVICE MANUAL REVISION 04/19, SW: 3.51
IMPORTANT SAFETY
INFORMATION
The following icons are used throughout this manual to draw special attention to safety
related information.
The service personnel should observe and/or act according to the
infomation in order to obtain the best possible function of the oven.
The service personnel must observe and/or act according to the
information in order to avoid any personal injury or damage to the
oven.
The service personnel must observe and/or act according to the
information in order to avoid any fatal injury. The symbol indicates a
hazard arising from dangerous voltage.

SAFETY INSTRUCTIONS
SERVICE MANUAL 9
REVISION 04/19, SW: 3.51
Failure to comply with the above instructions may increase the risk of
fire!
SAFETY INSTRUCTIONS
Gas units only
All gas units must be installed under an extraction hood, that is switched on when the
oven is working.
Do not block the exhaust pipes or the area around the oven.
The oven should only be used in calm conditions.
Ready for use
When the oven has been correctly installed, please read this manual carefully before
the oven comes into service.
Please make the manual available to all who service and maintain the oven and retain it
for future reference.
Always place trays filled with hot liquid in the bottom runners of the oven chamber to
avoid spilling the hot liquid on yourself when you take the tray out of the oven chamber.
Some areas on the outside of the oven may get as hot as 60°C or more. Therefore, you
should only touch the front of the oven.
Do not open the oven during the automatic cleaning process.
Do not store flammable materials around or under the unit.
When using the roll-in or trolley system, be aware of hot racks sliding out of the oven.
Use the parking brakes on the wheels to prevent trolleys from rolling away on uneven
floors.

SAFETY INSTRUCTIONS
10 SERVICE MANUAL REVISION 04/19, SW: 3.51
If you smell gas….
• Turn o the gas supply immediately.
• Do not use the control panel.
• Make sure there is ample ventilation near the oven.
• Avoid open fire and sparks.
• Call the gas supplier, using an external phone.
Maintenance and repair
Maintenance and repair should only be carried out by trained technicians.
Only use cleaning detergent that matches the specifications from the factory.