Gozney 75 Stone Core User Manual

75 STONE CORE

INSTALLATION MANUAL

(EUROPE)

VERSION 1.6

DATED 18/07/2019

CAUTIONS AND WARNINGS

OVERVIEW

FOR YOUR SAFETY

DO NOT STORE OR USE GASOLINE OR OTHER
FLAMMABLE VAPORS AND LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE

WARNING: IMPROPER INSTALLATION,
ADJUSTMENT, ALTERATION, SERVICE OR
MAINTENANCE CAN CAUSE PROPERTY DAMAGE,
INJURY OR DEATH. READ THE INSTALLATION,
OPERATING AND MAINTENANCE INSTRUCTIONS
THOROUGHLY BEFORE INSTALLATION OR
SERVICING THE EQUIPMENT

IMPORTANT: CONSULT YOUR LOCAL GAS
SUPPLIER FOR A STATEMENT OUTLINING A
PROCEDURE TO BE FOLLOWED IN THE EVENT
YOU SMELL GAS. POST THE STATEMENT IN A
PROMINENT LOCATION.

AREA MUST BE FREE AND CLEAR FROM COMBUSTIBLES AT ALL
TIMES

DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATION AIR, INCLUDING VENTILATION OF CYLINDER
ENCLOSURES, IF APPLICABLE

THE CUSTOMER’S BASE MUST NOT BE MADE OUT OF A
COMBUSTIBLE MATERIAL

INSTALLATION MUST CONFORM WITH LOCAL CODES.

THE APPLIANCE MUST BE DISCONNECTED FROM THE GAS
SUPPLY PIPPING SYSTEM DURING ANY PRESSURE TESTING
EXCESS OF 1/2 PSI (3.5KPA).

THE APPLIANCE MUST BE ELECTRICALLY GROUNDED IN
ACCORDANCE WITH LOCAL CODES.

THE STORAGE, HANDLING AND TRANSPORTATION OF ALL
SIZES OF GAS CYLINDERS, MUST BE IN ACCORDANCE WITH
LOCAL CODES. APPLIANCE PRESSURE REGULATOR SHALL BE

INSTALLED TO THE OUTDOORS IN ACCORDANCE WITH LOCAL
CODES.

Symbol

Description

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An appropriate safety instruction

should be followed or a Warning/

caution to a potential hazard exists

SAVE THESE INSTRUCTIONS

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CONTENTS

CAUTIONS AND WARNINGS 5

OVEN OVERVIEW 6

FOR YOUR SAFETY 6

PRE-INSTALL 11

EXTRACTION 12

INTRODUCTION 12
OPTION 1 - FLUE 12
OPTION 2 - CANOPY 12
OPTION 2 - CANOPY 13
EXCESSIVE VENTILATION FROM OVER HEAD CANOPIES 13

VENTING 14

INTRODUCTION TO VENTING 14
FACADE CLEARANCE 14
ACCEPTABLE VENTING 15
GENERAL DOS 15
GENERAL DON’TS 15
UNACCEPTABLE VENTING 16
FACTORS AFFECTING FLUE SYSTEM PERFORMANCE 17
EFFECTS FROM ENVIRONMENT 17
FAN AIDED EXTRACTION 17
GAS CLOSURE VENTILATION 18
OVEN SUPPORT STAND ENCLOSURE 18

CLEARANCES 19

CEILING CLEARANCE 19
WALL CLEARANCE 19

BUILD MANUAL 21

PARTS LIST 21
ARCH AND FLOOR 27
DOME AND FLUE 39
INSULATION 49

WOOD FIRED 55

FIRST FIRING 56

INTRODUCTION 56
WOOD FIRING STEPS 56

MAINTENANCE 57

MEASURE OVEN’S TEMPERATURE 57
FINISHED COOKING 57
ASH DISPOSAL 57
CLEANING THE OVEN 57
FLUE SYSTEM MAINTENANCE 57
FUEL OVERLOADING 57
REFUELLING ON TO A LOW FIRE BED 57
COOKING WITH WOOD TIPS 57

WARRANTY 59

Unit 18 & 19, The Runway,
Christchurch, Dorset.

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CAUTIONS AND
WARNINGS

This section details the correct operation
and install of a Gozney Oven.

CAUTIONS AND WARNINGS

OVEN OVERVIEW

FOR YOUR SAFETY

Ensure the oven is installed in accordance with the installation instructions and local

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building regulations.

Installation and servicing of this product could expose you to glasswool/ceramic

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fibres as well as calcium silicate dust. Always wear respiratory and eye protection
when installing or servicing this appliance.

It is of utmost importance that the correct air circulation and clearances are

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complied with at all times. Failure to adhere to the required clearances is a major
cause of oven related fires.

Do not pack clearance spaces with insulation or any other materials that could

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hamper air circulation.

Never store or use petrol or other such flammable vapours or liquids in the proximity
of this or any other appliance. Always keep the vicinity under and around this

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appliance free and clear of any combustible materials.

Never use liquid fuels such as petrol, lighter fluid or similar to start, maintain or

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‘boost’ a fire in the oven.

Ensure the oven is extracted correctly, failure to provide a correct flue/ extraction

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system for the oven may result in oven damage, fire or even death. Ensure the
correct flue/ extraction system is maintained and cleaned at all times. If uncertain,
do not use the oven.

Oven surfaces are hot whilst in operation. Keep children, pets, members of the

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public, clothing and furniture away at all times. Direct contact with the oven may
result in skin burns.

Beware of high oven temperatures, ensure you use protective long gloves when

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handling oven tools. Ensure you use appropriate high heat cookware and oven tools
at all times. Do not place unprotected hands or arms inside the oven whilst the oven
is lit. Wait until the oven is completely cool before removing ashes. Please note,
ashes and embers may retain heat for long periods of time.

Beware of flying sparks from the mouth of the oven, ensure that no combustible

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materials are within range of the oven at any time. Please refer to this manual’s
section on

Never use ice, water or any other liquids to lower the temperature or extinguish a fire

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in the oven. This can result in thermal shock and will void manufacturer’s warranty.

Oven Clearances

for more information.

Ensure a fire extinguisher is located at a safe distance from the oven at all times. The

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correct type of extinguisher for your oven must be used. Please seek advice from a
registered professional for more information.

Always use the Oven Door in accordance with the User Manual. The Door must never

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be in the Closed position whilst a fire is lit in the oven. Cutting off the oxygen can
cause the fire to erupt suddenly when the door is removed.

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In the event of a power failure, no attempt should be made to operate the oven and the

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manufacturer Gozney, should be contacted.

For gas models: USE ONLY THE CORRECT GAS FUEL FOR YOUR OVEN BURNER, DO NOT

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USE ANY PRODUCTS NOT SPECIFIED FOR THIS OVEN. This product must be installed by a
licensed plumber or gas fitter.

Failure to correctly install this oven can result in a fire. Ensure the oven is installed within

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the manufacturers guidelines. The following operation instructions must be followed to
reduce the risk of a fire.

Do not pack required air spaces with insulation or other materials.

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Do not store anything directly beneath the oven.

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It is recommended to install a CO2 alarm and a CO alarm within the same room as the

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appliance.

It is recommended to use appropriate pizza oven tools to operate the oven safely and

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efficiently.

Contact Gozney Ltd in the event that your oven requires maintenance or servicing.

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CAUTIONS AND WARNINGS

DEFRA

The Clean Air Act 1993 and Smoke Control Areas

Under the Clean Air Act local authorities may declare the whole
or part of the district of the authority to be a smoke control area.
It is an offence to emit smoke from a chimney of a building, from
a furnace or from any fixed boiler if located in a designated smoke
control area. It is also an offence to acquire an “unauthorised
fuel” for use within a smoke control area unless it is used in
an “exempt” appliance (“exempted” from the controls which
generally apply in the smoke control area).

In England appliances are exempted by publication on a list
by the Secretary of State in accordance with changes made to
sections 20 and 21 of the Clean Air Act 1993 by section 15 of
the Deregulation Act 2015. Similarly in Scotland appliances are
exempted by publication on a list by Scottish Ministers under
section 50 of the Regulatory Reform (Scotland) Act 2014.

In Wales and Northern Ireland these are authorised by
regulations made by Welsh Ministers and by the Department of
the Environment respectively.

Further information on the requirements
of the Clean Air Act can be found here at:
https://www.gov.uk/smoke-control-area-rules

Your local authority is responsible for implementing the Clean
Air Act 1993 including designation and supervision of smoke
control areas and you can contact them for details of Clean Air
Act requirements.

The Gozney 750 oven is an exempt appliance suitable for burning
wood logs and gozney manufactured wood logs in accordance
with the manufacturer instructions.

Unit 18 & 19, The Runway,
Christchurch, Dorset.

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PRE-INSTALL

This section details how to correctly
install a Gozney oven.

PRE-INSTALL

EXTRACTION

INTRODUCTION

A gas only oven can be extracted with two different methods.
It can have a direct twin walled flue system or an industrial
extraction canopy.

OPTION 1 - FLUE

For a direct flue the oven will require direct connection
to a 150mm (5.9 inch) internal diameter, twin walled flue
system that is appropriate for solid fuel burning. Refer to
the manufacturer’s guidelines regarding installation and
clearances.

Extraction option 1 - Flue

OPTION 2 - CANOPY

When operating a Gozney Oven exclusively on gas, it may be
possible to utilise an existing or new kitchen extract system
via the use of an extraction canopy.

ALWAYS CHECK WITH YOUR EXTRACTION PROVIDER PRIOR
TO USING YOUR OVEN.

When using a canopy for extraction of gas emissions, always
ensure that the canopy is working to a sufficient level prior
to gas burner ignition. In addition, canopy extraction should
remain on for at least 5 minutes after the gas burner flame
has been fully extinguished.

If adding any kind of facade to the oven, always ensure that
proper access is maintained, including sufficient room for
maintenance to the extraction canopy filters.

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Extraction option 2 - Canopy

Unit 18 & 19, The Runway,
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BH23 4FL.

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WARNING: EMISSIONS FROM THE OVEN WILL BE HOT
AND DISTANCES FROM ANY COMBUSTIBLES (INCLUDING
COMBUSTIBLE EXTRACTION COMPONENTS) MUST BE
ADHERED TO.

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WARNING: OVEN SHOULD
NEVER BE DIRECTLY
CONNECTED TO A CANOPY
EXTRACTION SYSTEM. ALWAYS
ADHERE TO CLEARANCES FROM
COMBUSTIBLES

WARNING: VENTING OPTION 2
IS FOR A GAS BURNING OVEN
ONLY. NEVER BURN WOOD OR
ANY OTHER SOLID FUELS WHEN
EXTRACTING WITH A CANOPY.

WARNING: ALWAYS ENSURE
THAT A CARBON MONOXIDE
MONITOR IS FITTED WITHIN A
SAFE DISTANCE OF THE OVEN.

WARNING: ENSURE THAT
REGULAR INSPECTION OF
THE EXTRACTION FILTER
IS MAINTAINED. BUILD UP
OF CREOSOTE CAN CAUSE
BLOCKAGES AND RISK OF FIRE

OPTION 2 - CANOPY

It is highly recommended that a sign is placed within close
proximity to warn users never to burn wood in the oven when
extracting with a canopy. Burning wood without the use of a
specialist twin walled flue system can cause breakdown, creosote
build up, melting of the system, and ultimately result in property
damage, injury and in some cases, death.

Dimensions of the canopy must be sufficient for the entirety of
the equipment it is serving, including the oven.

Unless restricted by walls, the dimensions of the canopy must
always exceed the area of the oven mouth and flue terminal
by a minimum of 250mm on each free side, and by 250mm at
the front and rear. These dimensions refer to the inside of the
condensation or stiffening panel / air intake channel of the
canopy.

Gozney Ovens suggest that an extraction canopy is positioned at
a distance of 350mm from the top of the oven dome. Emissions
will be hot when leaving the oven and positioning the extraction
hood at the correct distance from the where emissions exit
is of vital importance. Positioning the canopy closer than
recommended can cause heat damage to the canopy and a
potential risk of fire, whilst positioning the extraction too far away
from the oven is likely to compromise on the canopy’s ability to
extract emissions effectively.

EXCESSIVE VENTILATION FROM OVER
HEAD CANOPIES

In the event that the overhead canopy is extracting too vigorously
it can effect the gas burner’s performance and on occasion,
remove air too quickly from the oven and cause excessive heat
loss. Always check with your extraction provider if you suspect
the canopy is over or under performing.

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PRE-INSTALL

VENTING

INTRODUCTION TO VENTING

When installing a Gozney commercial gas fired oven there
are some basic guidelines to follow to ensure that the
gas burner is vented well and can operate correctly. Not
adhering to guidelines can be detrimental to the burner’s
performance and can even cause damage to the burner,
wiring and controller components.

The air drawn into the air intake vents should be of the same
atmospheric pressure as that of the oven mouth.

• In order to function properly, the gas burner requires
a sufficient flow of air from the air intake vent on
the burner.

• Drafts and external interruptions to air flow can effect
the efficiency of the gas burner flame or cause it
to fail.

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DAMAGE CAUSED BY NOT
ADHERING TO VENTING
INSTRUCTIONS WILL NOT BE
COVERED BY WARRANTY.

SERVICING & REPAIRS
REQUIRED BY NOT ADHERING
TO VENTING GUIDELINES WILL
NOT BE COVERED BY WARRANTY

• Blocking the air intake will also interrupt the flow of
air and decrease the efficiency and performance of
the burner.

• Always use the correct type of flue

Gozney Classic oven enclosure with adequate venting

FACADE CLEARANCE

When installing a facade to the oven, a minimum of 500
mm x 500 mm or equivalent area air intake is required for
the oven stand enclosure and must be maintained at all
times. This air intake must not be covered or obstructed
with objects and must not be smaller than the dimensions
listed as to provide access and maintenance to the ovens.

Always ensure that the air intake does not become blocked
with insulation or any other materials. Any blockage is likely
to cause interruptions to the air flow and will effect the
performance of the gas burner.

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IMPORTANT NOTE: IF
ENCLOSING THE OVEN IN A

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FACADE, YOU MUST LEAVE AN
ACCESS PANEL TO ALLOW FOR
SERVICE OF THE GAS BURNER
SYSTEM AND EXTRACTION
WHERE APPLICABLE.

Unit 18 & 19, The Runway,
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BH23 4FL.

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ACCEPTABLE VENTING

It is important that the gas burner has sufficient ventilation
to operate correctly.

GENERAL DOS

• Maintain a clear air flow to the gas burner from the
same area as the oven mouth.

• The gas burner must be accessible at all times.

• Air vent must be no smaller than 500mm x
500mm to allow adequate air flow.

GENERAL DON’TS

• Don’t block the air vent

• Don’t add additional ventilation to the oven enclosure

Type 1 fully sealed enclosure with air vent.

Exhaust Flue Ceiling

Air intake grill and service access panel located
below oven mouth in the enclosure wall.

False ceiling
Additional Ceiling maybe required
if the stud walls finish at the height
of the false ceiling.

Enclosure
walls

Type 2 fully sealed enclosure with air vent

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PRE-INSTALL

VENTING

UNACCEPTABLE VENTING

Additional Venting or Poorly Sealed enclosure Blocked Air Vent

Enclosure Open to False Ceiling Void No Rear/ceiling/side around Enclosure

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Unit 18 & 19, The Runway,
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BH23 4FL.

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Flue Extraction

FACTORS AFFECTING FLUE SYSTEM
PERFORMANCE

DOWNDRAFT CONDITIONS

Downdraft is caused when air is forced back down the flue system
and into the oven cavity and room where the oven is situated.
This can be caused by environmental conditions acting on an
incorrectly positioned flue terminal. Downdraft is usually only
apparent in flue systems that do not include fan aided extraction.

EFFECTS FROM ENVIRONMENT

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Incorrect exhaust draft direction

Correct exhaust draft direction

ALWAYS ENSURE THAT
THE FLUE IS PERFORMING
CORRECTLY PRIOR TO USING
THE OVEN. IF THE FLUE IS NOT
PERFORMING CORRECTLY IT
CAN PUSH EMISSIONS BACK
DOWN INTO THE OVEN CAVITY
AND INTO THE ROOM WHERE
THE OVEN IS SITUATED.

When wind blows across a building, it can cause a difference
in pressure between the entrance and exit of the flue. This will
depend upon the:

• wind speed

• direction of the wind

• position of flue outlet in relation to the building

• location of neighbouring buildings and structures

• geographical features (e.g. hills and valleys).

These can cause or prevent a natural draft to occur in the flue.
Because of this it may cause any one of the following to occur:

• increased flow up the flue

• reduced flow up the flue

• intermittant downdraft.

Because of its nature, wind pressure on occasions can be greater
than the flue draught from open flues. To minimise this effect it is
important that you position the flue terminal where the effect of
the wind is minimised.

FAN AIDED EXTRACTION

If at any moment you believe that the fan is working incorrectly
and pushing emissions back down the flue system, you should
extinguish the oven and extraction immediately and seek further
assistance.

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INCORRECT EXTRACTION POSES
A SERIOUS RISK OF CARBON
MONOXIDE POISONING.

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PRE-INSTALL

VENTING

GAS CLOSURE VENTILATION

It is important that the gas burner has sufficient ventilation to
operate correctly.

Gas ovens require clearance air spaces to ensure the gas
burner has adequate air intake. It is necessary to create an air
intake opening, measuring at least 500 mm x 500 mm, located
underneath the oven door/opening, as shown in the diagrams
above. Doing so will ensure that the air required for the gas
burner will be taken from the same atmospheric environment in
which the oven chamber opens. This is required for optimum
gas burner operation.

WARNING: Ensure the air intake opening remains clear from
obstruction at all times. When installing the oven outdoors, the
area around and beneath the oven must be kept clear of grass,
leaves and other combustible materials at ALL times.

Allow vent

Cladding to customers
design

Correct gas enclosure

OVEN SUPPORT STAND ENCLOSURE

In order for the gas burner to operate correctly, the external walls
of the oven support stand must be enclosed on all sides to shield
the gas burner from drafts or other atmospheric interruptions.

Support stand enclosure must be made entirely from non­combustible materials.

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Incorrect gas enclosure

Unit 18 & 19, The Runway,
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BH23 4FL.

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PRE-INSTALL

CLEARANCES

CEILING CLEARANCE

A minimum clearance of 350mm from any combustible
material is required from the top of the oven. These
clearances apply over and above the oven core and
insulation materials, from the outer most extremity of the
oven’s final finished surface.

WALL CLEARANCE

A minimum of 50mm clearance is required from all
sides of the outermost extremity of the oven walls.
If a façade or material is in contact with the oven, it
must be comprised of completely non-combustible
materials. When non-combustible materials are attached
to the oven, the above clearances must be measured
from the outside of those non-combustible materials.

Any materials 750mm to each side of the oven doorway
and above must be constructed of non-combustible
materials.

1000mm 50mm

Side profile of Classic oven.

Red area: minimum clearance

The oven stand should only be installed on a non­combustible floor surface. The non-combustible floor
surface should extend a minimum of 1000mm out in front
of the oven and extend by a minimum of 750mm from either
side of the oven entrance.

When using a gas burning oven the space below the stand
must NEVER be used for storage. This space is required
for air intake of the gas burner. Not maintaining air
access to the burner is a serious risk and could void the
oven warranty.

350mm

750mm

Front profile of traditional oven.

Red area: minimum clearance

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