Mugnaini PRIMA 120 Installation instructions

PRIMA 120 ASSEMBLY ON SITE/MASONRY
CONSTRUCTION MANUAL
ITALIAN WOOD-FIRED OVEN
Masonry Assembled
PRIMA 120
RESIDENTIAL WOOD-FIRED OVEN
Mugnaini Imports, Inc.
11 Hangar Way, Watsonville CA 95076
888.887.7206 │831.761.1767 │Fax: [phone]
www.mugnaini.com │[email protected]
Includes: Venting and Oven Curing Instructions
Mugnaini Residential Wood-Fired Ovens have been tested
to: UL 737–2007


W120 Oven
ITALY’S ORIGINAL PIZZA OVENITALY’S ORIGINAL PIZZA OVEN

Prima 120 AOS Manual Mugnaini Imports, Inc. 2
GENERAL INFORMATION
This construction manual contains information regarding the construction of a support base and assembly
of your PRIMA 120 AOS Oven. The foundation and base provide a support structure for the oven and serve
as a wood storage compartment. Concrete masonry units (CMU’s), cast-in-place concrete or similar materials
are typically used to construct the base on a poured-in-place, reinforced concrete foundation. Consult your
Architect, Designer, Engineer, or Masonry Contractor for more specic design and construction criteria.
WARNINGS
Failure to follow instructions will void manufacture’s warranty and may result in property damage,
bodily injury, or even death. If this oven is not properly installed, a re may result. To reduce the risk of
re, follow the installation instructions.
A major cause of oven-related res is failure to maintain required clearances (air spaces) to
combustible materials. It is of utmost importance that this oven be installed only in accordance with
these instructions. For indoor installations, do not pack the required 2” air spaces with insulation or
other material.
Contact local building or re ocials concerning any installation restrictions or need for inspection of
the oven installation.

Prima 120 AOS Manual Mugnaini Imports, Inc. 3
TABLE OF CONTENTS
1. INTRODUCTION
Package Contents and Dimensions ....................................................................................................................4
2. CONSTRUCTING THE OVEN BASE
Materials List and Step-by-Step Instructions...................................................................................................5
3. OVEN ASSEMBLY
Materials List ..............................................................................................................................................................7
Step 1 – Floor Layout...............................................................................................................................................7
Step 2 – Mortaring The Floor ................................................................................................................................7
Step 3 – Crown Assembly ......................................................................................................................................8
Step 4 – Mortaring Crown Base ...........................................................................................................................9
Step 5 – Mortaring Crown Joints.........................................................................................................................9
Step 6 – Installing Flue Manifold ...................................................................................................................... 10
Step 7 – Insulation ................................................................................................................................................ 10
Step 8 – Oven Venting ......................................................................................................................................... 11
4. ENCLOSING THE OVEN
Diagrams .................................................................................................................................................................. 12
Gable Shaped Enclosure ..................................................................................................................................... 13
Dome Shaped Enclosure..................................................................................................................................... 15
5. OVEN VENTING INSTRUCTIONS
Overview .................................................................................................................................................................. 18
Conditions of Acceptability................................................................................................................................ 18
Recommended Chimney Pipe........................................................................................................................... 19
Elbow Oset Chart................................................................................................................................................ 20
Precautions.............................................................................................................................................................. 21
6. CURING A WOOD-FIRED OVEN ............................................................................................................. 22
Instructions.............................................................................................................................................................. 23
Selecting The Proper Wood For Your Oven ................................................................................................... 23
Fire Starting Tools.................................................................................................................................................. 23
Using The Door....................................................................................................................................................... 24
How to Measure Oven Temperature ............................................................................................................... 24
Starting a Fire.......................................................................................................................................................... 25
Curing The Oven.................................................................................................................................................... 25
Curing Schedule .................................................................................................................................................... 29
6. LIMITED WARRANTY ............................................................................................................................................... 30

Prima 120 AOS Manual Mugnaini Imports, Inc. 4
INTRODUCTION
The following is intended to be used as a general reference for the installation of the Mugnaini “PRIMA
120” wood-burning oven, and more specically for those individuals (like yourself, your architect, or your
contractor) who will be involved with the design and the construction of your oven.
W120 Oven
B
C
ED
G
1
2
3
4
5
F
H
6
7
8
9
10 A
L
K
Package Contents Check List
❑Oven Crown Elements (Items A–H)
❑Metal Flue Manifold with Screws (Item I)
❑Removable Iron Door (Item J)
❑Thermal Insulating Blanket (Item K)
❑4-Piece Utensil Set: 5’long Brush and Palino,
Wooden Peel & Infrared Thermometer Gun (Item L)
❑Floor Elements (Items 1–10)
Dimensions: Prima 120
Exterior:
 •CrownWidth:54”
 •CrownLength:56”
 •CrownHeight: 23”
•Archwidth:32”
Interior:
 •CookingFloor:48”W x 52” L
 •ArchOpening:22”W x 11” H
I
J

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INSTRUCTIONS
STEP 1
Construct 6” min. reinforced concrete foundation
on top of 6” aggregate base and 95% compacted
native soil. (See Step 1 for a typical cross section.)
Footing dimensions are 12” x 12”.
STEP 2
Construct 2 side walls and 1 back wall using 6” concrete
blocks (or other) with #4 rebar at 16”o.c. The height for this
rst block layer is typically 35”. Note that the stated height of
the base has been formulated for use by individuals 5’6” to
5’9” in height. If elevation adjustments are desired, modify
the height of the lower base only (the wood storage area).
Contractor to verify height of nal installation with the owner.
Oven Base Materials List Using 6” CMU Block
❑6 Sack Concrete
  •Foundation~1yd.
  •1stLoadBearingFloor~5/8yd.
  •FinalElevatedSlab~½yd.
❑#4Rebar~180LF
❑6”CMUBlock~56blocks
❑Sand~5/8yd.
❑6”x6”–10/10WWF~34sq.ft.
❑Construction Paper (free of oil, tar, or resins)~34sq.ft.
CONSTRUCTING THE OVEN BASE
STOP
Before you begin construction, determine your nished oven oor height. Oven oor height
should be about users elbow height.
64”
72”
(minimum
outside
dimensions)
STEP 1
Construct
Foundation
(wood storage area)
STEP 2
Construct
Walls
~ 35”

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STEP 3
Place #4 rebar 12” o.c.,
each way, 2” above CMU block
and pour a leveled 4”concrete slab.
STEP 4
Install/extend6”or8”concreteblockaroundperimeter
ofloadbearingoortoaheight~8”).Fillwith3”of
dry sand. Cover dry sand with construction paper
(free of oil, tar or resins) or similar product (NO PLASTIC!)
as moisture barrier. Before progressing to step 5
determine desired length and depth of extended
shelf — may extend beyond minimum of
10” deep x 32 ½” wide.
STEP 5
Place6”x6”–10/10weldedwirefabric
(1” above sand using wire dobies) and place
#4 rebar for a front shelf 10” deep x 32 ½”
wide (minimum) as support for shelf.
Pour a leveled 3” concrete slab on top
of the construction paper, sand base and
to the outside edge of block perimeter.
Once cured, go to Section 3 —
Oven Assembly.
STEP 3
Construct Elevated
Load Bearing Floor.
STEP 4
Construct Additional
Block Layer. Fill with
Sand and Cover with
Construction
Paper.
STEP 5
Pour Final
Concrete Slab

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OVEN ASSEMBLY
Materials List
❑Refractory Mortar
  •1-80lb.bagdry
  •or1-75lb.bucket,pre-mixed
  •FinalElevatedSlab~½yd.
❑Perlite
  •8bags(32cubicft.total)
INSTRUCTIONS
STEP 1  FLOOR LAYOUT
Lay out oor elements (Items 1 thru 10) onto the concrete slab to establish the center point. Next, using a
pencil, mark an outline of the pre-assembled oor on the concrete slab for easy assembly.
W120 Oven
B
C
ED
G
1
2
3
4
5
F
H
6
7
8
9
10 A
STEP 2  MORTARING THE FLOOR
Using refractory mortar, place each oor element in the following succession (Item 1 thru 10). Floor pieces
should t together as snug as possible.
Note:Duetothehandmadecharacteristicsofthisproduct,a1/8”gapmayexistbetweenoorelements.
DO NOT mortar or grout in between the oor element joints.
The natural gap between oor elements is designed to allow for thermal expansion.
K

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STEP 2  MORTARING THE FLOOR continued
STEP 3  CROWN ASSEMBLY
First, place and interconnect the crown elements (Items A and H) around the oor elements.
(Item B and C must slide into item A). All other items overlap each other. You may use a small pry bar at
base to manipulate into place the dome pieces on the exterior of the dome.
DO NOT place mortar in the crown element joints.
A small gap of roughly ¼”– ½”will also exist between the oven oor and crown elements.

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STEP 4  MORTARING CROWN BASE
Wet sponge joints. Apply refractory mortar to the outside base of crown elements.
(Approximately 3” wide x ½” thick over the outside perimeter).
STEP 5  MORTARING CROWN JOINTS
Wet sponge joints. Apply refractory mortar over the joints. (Approximately 4” wide x ½” thick over
each joint). Do not allow mortar to enter joints.

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STEP 6  INSTALLING THE FLUE MANIFOLD
Placeuemanifoldonarchandmarkfroscrews.Drill2holeswithmasonrybit(1/8”w–1¼”d). Attach ue
manifold with provided screws. Mortar base of metal manifold (½” – 2”).
Note: Ensure the ue manifold is level on top of crown elements.
STEP 7  INSULATION
Cover the entire oven with 2-layers of 1” or 1-layer of 2” Thermal Insulation Blanket (Item K).

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STEP 7  INSULATION continued
STEP 8  OVEN VENTING
Based on the overall oven design and architecture, each chimney system will vary. Contact your local
licensed chimney or mechanical contractor. See pg. 18 for“Oven Venting Instructions”.

Prima 120 AOS Manual Mugnaini Imports, Inc. 12
ENCLOSING THE OVEN
Your Mugnaini Oven is now ready for the nal step of the construction process – which relies entirely
on your level of creativity and desired architectural eect. The oven enclosure protects the oven from
atmospheric moisture, supplies ventilation to the oven (so that condensation does not occur within the
compartment), and retains the insulating materials placed over and around the oven crown itself.
Chimney pipe length will vary depending on oven enclosure design. Consider this when determining
your oven roof height. See page 19 & 20 for chimney pipe information.
BUILT IN GABLE
DOME  WIDE DOME  NORMAL

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STEP 1
Using 6” concrete blocks, build enclosure walls
around the oven at the perimeter of the concrete
slab to a minimum height of 35”.
STEP 2
Setting Anchor Bolts: Before the grout sets on the top
coarse of concrete blocks, place ½” x 10” foundation
bolts for the roof framing.
STEP 3
Once the oven enclosure walls have been completed
and before the top is put in place, ll this enclosure
with the specied loose Perlite 9” on top (measured
from the 1”Thermal Insulation Blanket).
STEP 4
Place pressure treated 2”x 4” (P.H.T.F’s) or metal
studs around the top edge of the concrete blocks
and attach to the foundation bolts. Build your roof
rafters to the appropriate pitch for the roong
materials being used and attach ½” plywood.
Place a 2”diameter metal weatherproof air vent
on the back near the top of your structure. You
may use nonammable roong materials of your
choice. (e.g. Slate, Roof Tiles, Metal etc.)
GABLE SHAPED ENCLOSURE
Example

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Chimney cap with
spark arrestor
Simpson Dura-tech or
equivalent
Roof material of choice
1/2” plywood sheeting
Over 2x4 rafters @ 16” O.C.
Perlite or vermiculite insulation
Thermal insulating
blanket
Wood burning oven
model: Prima 120
3” conc. Slab with 6 x 6—10/10
WWF over construction paper
3” dry sand base
4” conc. Slab with #4 bars
@ 2” O.C. Each way
6” conc. block
#4 bars @ 16” O.C.
Finish materials: stucco,
stone, brick, etc.
4” conc. slab with #4 bars
@ 16” O.C. each way
#4 dowels @ 16” O.C.
footing to conc. block
4” aggregate base
OPEN WOOD STORAGE
12”
min.
Tile, plaster or metal roof cap
#4 cont.
12” min.
Verify with owner
+/- 3’– 9” 22 3/4” 12” 2’– 0’ min.
4” 3” 3”
2 x 4 P.T.D.F. Mudsill with
1/2” A.B. @ 16” O.C.
2” clr.
PRIMA 120 SECTION SAMPLE DIMENSIONS
Verify
Oven Floor
72”
64”
6” conc. block
10”
1” arch
2” clearance from combustable
materials
2”
12”
min.
16”
Outside diameter: 54”
4” Min.
Arch
10”x 38” (min width)
Cantilevered hearth extension,
subject to owers preference.
8” diameter flue-manifold
Flue setback: approx. 12” from
arch front using 30° elbow
23”
Arch opening
32”
Arch width
Perlite granules
Thermal insulating
blanket (1”)
PRIMA 120 FLOOR AND BASE PLAN
STEP 5
Finish the exterior enclosure walls
with non-ammable materials
of your choice. (e.g. Exterior
Weatherproof Stucco, River Rock,
Slate, Ceramic Tile etc.)
NOTE: If placing the oven under
an overhang or patio structure
follow local Building Codes and
Fire Marshall requirements for
passing the chimney through
combustible ceilings.

Prima 120 AOS Manual Mugnaini Imports, Inc. 15
DOME SHAPED ENCLOSURE
Example
STEP 1
Attach the appropriate Simpson DuraTech chimney (or
similar product) on top of the ue and extend, based on
your overall dimensions.
STEP 2
Drill holes to accommodate ¼” steel pencil rod rebar
around the perimeter of the concrete slab 12” apart.
STEP 3
Place Pour Stone™ or equivalent and 6ft. lengths of the
above mentioned rebar in the drilled holes and bend to
desired shape, then wait for the Pour Stone™ to cure.
STEP 4
Once the Pour Stone™ or equivalent has cured, reshape
the rebar and wire all the ends together at the top around
the chimney, leaving the excess for now.
STEP 5
Begin at the bottom of the rebar and wrap with expanded
metal lath around the perimeter. Work your way to the
top, wiring the lath together as you go. Cut out a 12”x
12” access hole in the back at least 10” up from the oven
crown to pour in the Perlite granules. Place a 2” diameter
metal weatherproof air vent on the back near the top of
your structure at the chimney to prevent condensation
within the oven enclosure.

Prima 120 AOS Manual Mugnaini Imports, Inc. 16
STEP 6
Begin again at the bottom and work your way to the top
overing the expanded metal lath with the rst (scratch)
coat3/8”thickexteriorstucco.PourinthePerlitegranules
then wire and stucco the access hole closed and wait for
this coat to cure.
STEP 7
Once the rst coat has cured you may now cut o the
excess rebar at the chimney. Begin again at the bottom
and cover the rst coat with the second (brown) coat
3/8”thickexteriorstuccorightuptothechimneytoseal
completely. Wait for this to cure.
STEP 8
After second coat of stucco has cured, you may now
paint or use nished stucco coat.
NOTE: If placing the oven under an overhang or patio
structure follow local Building Codes and Fire Marshall
requirements for passing the chimney through
combustible ceilings.

Prima 120 AOS Manual Mugnaini Imports, Inc. 17
72”
64”
6” conc. block
10”
1” arch
2” clearance from combustable
materials
2”
12”
min.
16”
Outside diameter: 54”
4” Min.
Arch
10”x 38” (min width)
Cantilevered hearth extension,
subject to owers preference.
8” diameter flue-manifold
Flue setback: approx. 12” from
arch front using 30° elbow
23”
Arch opening
32”
Arch width
Perlite granules
Thermal insulating
blanket (1”)
PRIMA 120 FLOOR AND BASE PLAN
Chimney cap with
spark arrestor
Simpson Dura-tech or
equivalent
7/8” exterior cement plaster
1/4” steel pencil rod rebar
Perlite insulation
Thermal insulating
blanket (1”)
Wood burning oven
model: Prima 120
3” conc. Slab with 6 x 6—10/10
WWF over construction paper
3” dry sand base
4” conc. slab with #4 bars
@ 12” O.C. each way
6” conc. block
#4 bars @ 16” o.C.
Finish materials: stucco,
stone, brick, etc.
4” conc. slab with #4 bars
@ 16” O.C. each way
#4 dowels @ 16” o.C.
footing to conc. block
4” aggregate base
12”
min.
Tile, plaster or metal roof cap
12” min.
Verify with owner
+/- 3’– 9” 2’– 0’ min.
4” 3” 3”
2” clr.
OPEN WOOD STORAGE
#4 cont.
22 3/4” 12”
PRIMA 120 DOME SECTION SAMPLE DIMENSIONS
Verify
Oven Floor

Prima 120 AOS Manual Mugnaini Imports, Inc. 18
OVEN VENTING INSTRUCTIONS
Residential Model Wood-Fired Ovens
OVERVIEW
Your Mugnaini wood-red oven has been listed to the UL Standard for Safety for Fireplace Stoves,
UL 737 8th edition.
These requirements cover replace stoves that are freestanding assemblies having re chambers intended
to be operated open to the room with the door either open or closed.
Ovens covered by these requirements are intended for attachment to a residential chimney capable of being
used for use with solid wood or coal fuels.
Mugnaini wood-red ovens are intended for installation in accordance with the Standard for Chimneys,
Fireplaces, Vents and Solid Fuel Burning Appliances, NFPA 211.
CONDITIONS OF ACCEPTABILITY
• Thewood-burningovenisnotprovidedwithachimneysystem.Theovenmustbeconnectedtoany
listed chimney assembly.
• ThechimneyassemblymustbeinstalledinaccordancewithNFPA211StandardforChimneys.
• Thechimneydiametersizeis8”.
• Factory-builtchimneysorclayuelinersareacceptable.
• Thechimneymusthaveatleast36”ofverticalrise.
• The oven is not designed to support the weight of a chimney length greater than 36” without
additional support. Failure to properly support the chimney pipe may damage the oven and void your
warranty. Follow chimney manufacturer’s installation instructions for proper chimney support.
• Chimneymustterminatetoanapprovedchimneycapwithsparkarrestor(screenmesh).
• SinglewallandB-typeventpipesareNOTacceptableforthistypeifappliance.
• DONOTCONNECTTHISUNITTOACHIMNEYFLUESERVINGANOTHERAPPLIANCE.
• CONTACTLOCALBUILDINGORFIREOFFICIALSABOUTRESTRICTIONSANDINSTALLATIONINSPECTION
IN YOUR AREA.

Prima 120 AOS Manual Mugnaini Imports, Inc. 19
• DuraTechisanall-fuelchimneysystemdesignedforappliancesthatrequireaUL103chimneysystem.
With a Thermal Tech blanket insulation encased between dual walls, DuraTech oers safety and
performance. It keeps the outer wall cool, while ensuring high ue gas temperatures for optimum draft.
• Clearances: 2” clearance to combustibles.
• Directventbyconnectingtheovenueoutlettoa8-inchdiameterlistedchimneyratedforuseasa
2100° F chimney system. Chimney must terminate to an approved spark arrestor.
• YourMugnainiwood-redovenwasevaluatedtomeettheresafetystandardsofUL737-EighthEdition
by Intertek Testing Laboratories, ETL Listing Report #J20020124 www.interteksemco.
• Theovenisdesignedforusewithdrywoodfuelonly.
RECOMMENDED CHIMNEY PIPE
Mugnaini Imports recommends the Simpson DuraTech chimney pipe.
Simpson products can be found on the web at www.duravent.com. Proper planning of the chimney
venting system is essential for a safe and successful installation.
CAP WITH SPARK ARRESTOR
WALL STRAP
ELBOW STRAP
CHIMNEY SECTION
ELBOW
CHIMNEY RUN WITH ELBOWS
SAMPLE SAMPLE
STRAIGHT PIPE
CAP WITH SPARK ARRESTOR
STRAIGHT CHIMNEY SECTION
ELBOW
ADAPTER ASSEMBLY (if using simp/dura) METAL MANIFOLD
TAPCON SCREW

Prima 120 AOS Manual Mugnaini Imports, Inc. 20
ELBOW OFFSET CHART
SIZE 5”, 6”, 7”, 8” Diameter
Elbow Angle
from Vertical
Chimney Length
between Elbows
Offset
inches
Rise
inches
15°
15°
15°
15°
15°
15°
15°
15°
15°
15°
15°
15°
15°
30°
30°
30°
30°
30°
30°
30°
30°
30°
30°
30°
30°
30°
0”
6”
9”
12”
18”
24”
36”
48”
48“+ 6”
48“+ 9”
48“+ 12”
48“+ 18”
48“+ 24”
0”
6”
9”
12”
18”
24”
36”
48”
48” + 6”
48“+ 9”
48“+ 12”
48“+ 18”
48“+ 24”
2”
3 1/4”
4”
4 3/4”
6 1/4”
8”
11”
14 1/4”
15 1/2”
16 1/4”
17”
18 1/2”
20”
4”
6 1/4”
7 3/4”
9 1/4”
12 1/4”
15 1/4”
21 1/4”
27 1/4”
29 3/4”
31 1/4”
32 3/4”
35 3/4”
38 3/4”
16 1/2”
21 1/4”
24 1/8”
27”
32 3/4”
38 1/2”
50 1/4”
61 3/4”
66 1/2”
69 3/8”
72 1/4”
78”
83 3/4”
15 3/4”
20”
22 5/8”
25 1/4”
30 1/4”
35 1/2”
46”
56 1/4”
60 1/2”
63 1/8”
65 3/4”
71”
76”
< >
< >
RISE
OFFSET