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
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
W120 Oven
ITALY’S ORIGINAL PIZZA OVENITALY’S ORIGINAL PIZZA OVEN

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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.

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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

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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).