One Systems Natatorium User Manual

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Marc h 28, 2014

One Systems Natatorium (Indoor Swimming Pool)

Speaker Products Installation Manual

One System s has devel op ed a nar r ow focus, appl icatio n s pecific set of pro du c ts designed
for use in Natatorium (indoor swimming pool) environments. The 108IM/NAT and 112/NAT
are constructed using very high molybdenum content stainless steel for all internal and
external structural rigging members.

Indoor swimming pool environments can present very high relative humidity and harsh
chemical atmospheres. The combination of humidity and airborne chemical composition
restricts the mounting of the 112/NAT or 108/NAT to wall mounting in solid concrete or grout
filled block (CMU) concrete walls ONLY! One Systems does not allow wire rope suspension
of its products in Natatorium environments. Call One Systems regarding direct mounting to
the structural steel of the indoor swimming pool building (Galvanic isolation is required!).
One Systems offers recommendations for installation on solid concrete and grout filled block
walls. Contact One Systems for additional information.

Commonly us e d st ainless steels such as 304-grade and 316 -grade, known as austenitic
steels, offer good corrosion resistance and strength in harsh environments. Marine-grade
(speci fical l y kn ow n as 31 6-gr a de s tainless steel) offers additional protection in salt spray,
ocean front, and cruise ship applications. Unfortunately, these austenitic materials are
susceptible to chloride stress corrosion cracking (SCC). Both 304-grade and 316-grade are
susceptible to SCC. SCC is a particular problem in indoor swimming pool environments and
can result in structural failure of the rigging components. The chlorine based chemicals in
the water react with “human” by-products, suc h as sweat, and produce chloramines. These
chloramines an d hy dr oly zed bypr o duc t s pass into the atmosphere and are deposited on all
surfaces in the Natatorium. They are transported throughout the space via the air handling
system of the venue. This is particularly problematic in areas above the pool surface that are
not routinely washed down or cleaned. Loudspeakers and their associated rigging are
typically mounted far above the “splash zone” and these chloramines are left to settle on
structural surfaces, so that SCC can progress to critical levels. Unfortunately, there are no
establi sh ed t hr e sholds for c hl or am i n e exposur e and ass o ci ated stress levels in th e structur al
members, so SCC can be a significant concern in Natatorium environments. Additionally
there are no visual inspection methods that will detect SCC, so careful monitoring will not
insure th at s tr uctural members are fr ee from this effect. One Systems cannot recommend
the use of stainless steel wire ropes for suspension because of the issues discussed above.

Alternate structural materials, such as aluminum or plated steels, can al so suffer fr om
chloramine attack and other corrosion mechanisms. Fortunately, there are several grades of
stainless steels that are extremely resistance to Chloride SCC. Super austenitic stainless

steels consisting of 6% molybdenum are excellent choices. There are several super
austenitic grades that are very strong and well suited for structural members due to their
excellent SCC resistance. These grades are recognized by several European countries as
being the only acceptable stainless steels for use in Natatorium environments where they
are load bearing and above the “splash” zone and not routinely washed or cleaned. One
Systems uses AL6XN (N08367) material. Oth er m ater i als ar e 1. 4547 and 1. 45 29 6%Mo
stainless steels.

NOTE: ONE SYSTEMS DOES NOT RECOMMEND MOUNTING

IT’S PRODUCTS DIRECTLY TO THE NATATORIUM
STRUCTURAL STEEL DUE TO THE
COMPLEXITY OF THE GALVANIC
ISOLATION DESIGN AND THE CORROSIVE NATURE

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OF THE ENVIRONMENT! (Contact One Systems for
additional information.)

NOTE: THIS MANUAL DOES NOT COVER THE USE OF WIRE

ROPES OR OTHER SUSPENSION METHODS
CONNECTED TO THE STRUCTURAL STEEL OF THE
BUILDING!
NOTE: STAINLESS STEEL WIRE ROPES ARE NOT
RECOMMENDED FOR USE IN
NATATORIUM (INDOOR SWIMMING POOL)
ENVIRONMENTS FOR LOUDSPEAKER SUSPENSION !

NOTE: DO NOT ATTEMPT ANY OF THE OPERATIONS IN THIS
MANUAL IF YOU DO NOT FULLY UNDERSTAND THEN! ALWAYS
CONSULT AN EXPERT WITH EXPERIENCE IN THE OPERATIONS
NOTED IN THIS MANUAL!

NOTE: THIS MANUAL CONSISTS OF FOUR (4) SECTIONS:

1. GENERAL ASSEMBLY OF THE LOUDSPEAKER Page 4

2. MOUNTING TO SOLID CONCRETE WALLS Page 6

3. MOUNTING TO CONCRETE BLOCK
A. GROUT FILLED CMU BLOCKS Page 13

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MOUNTING TO HOLLOW CORE BLOCK IS NOT PERMITTED!

4. General NAT product specif ications Page 25

NOTE: DO NOT ATTEMPT ANY OF THE OPERATIONS IN THIS
MANUAL IF YOU DO NOT FULLY UNDERSTAND! ALWAYS
CONSULT AN EXPERT WITH EXPERIENCE IN THE OPERATIONS
NOTED IN THIS MANUAL!

NOTE: All drilling operations in the manual require masonry bits. Consult
and expert regarding the appropriate bit!

U-Bracket Assembly of the 108IM/NAT and 112IM/NAT

The One Systems 108IM/NAT and 112IM/NAT use high molybdenum content stainless steel
for all structural and load bearing points. Both products are supplied with an external “U­bracket” mounti ng c o n figurati on. Thi s is the only ap pr oved mounting method for the NAT

loudspeaker series.

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NOTE: There are ONLY three (3) mounting points on the NAT enclosures. Two points ar e
used for the ex t er nal U-bracket and the third point may be used as a secondary safety point.

Both the 108IM/NAT and 112IM/NAT are supplied with external U-brackets, bolts and
washers that are required to mount the U-bracket to the enclosure. DO NOT SUBSTITUTE

ANY PARTS USE D TO ATTACH THE U-BRACKET TO THE EN C LOSURE!

The U-bracket (AL6XN material) and associated washers and bolts are supplied and
attach ed to eac h en cl os ure. The bracket must be disassemble d f or ins tal l ation.

The enclosure and attached U-bracket are shown in the image below. The enclosure is
attach ed to the U Br acket using the supplied AL6XN bolts and Nord-Lock washers. The
108/NAT uses 5/16” bolts and 5/16” (M8) Nord Lock washers. The 112/NAT uses 3/8” bolts
and 3/8” Nord Lock washers. DO NOT SUB STITUTE TH ESE PARTS. The enclosure

should be mou nt ed t o the U br acket AFTER the U bracket has been mounted to either a
solid concrete wall or grout filled block (CMU) wall!

Each Nord Lock washer set consists of TWO parts and BOTH must be used on each bolt
assembly. See the image below. The Nord Lock washer is shown in light blue col or .

Also note the supplied silicone washer. This large washer must be located between the NAT
enclosure and the U-bracket. This silicone washer will help prevent rotation of the NAT
enclosur e onc e th e des i r e d ai m i ng an gl e is ac hieved.

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Silicone washer AL6XN bracket Nord Lock washer AL6XN bolt

NOTE: It is critical that the correct torque values be observed when assembling the U­bracket assembly.

The 5/16” bol ts used on the 10 8IM/ NA T U-bracket should be tig ht ened to a torque value of
14ft lb. (19.0Nm)

The 3/8” used on the 112IM/NAT U-bracket should be tightened to a torque value of 24ft lb.
(32.5Nm).

Full installation instructions for the Nord Lock washers may be found on the One Systems
web site (www.onesystems.com
Natatorium section.

) in the Technical Papers/Install Guides under the

NOTE: In d oor swim m ing po ols (N a tatori um s) ca n be very harsh
environments. It is necessary to perform a yearly inspection of all
rigging elements. It is also necessary to perform a yearly visual
inspection on the U-bracket silicone washers (see the image
above). Any signs of degradation or corrosion will require
replacement of any structural elements, including the silicone
washers.

Mounting to Solid Concret e Wa l ls:

(Concrete anchors are NOT ALLOWED for use with cinder block
construction)

IMPORTANT: IT IS THE RESPONSIB ILITY OF THE INSTALLER TO
VERIFY THAT THE WALL SURFACE IS STRUCTURALLY CAPABLE
OF SUPPORTING THE PRODUCT AND ALL ASSOCIATED SAFETY
FACTORS AS REQURED BY ALL APPLICABLE CODES AND SAFE
SUSPENSION PRACTICES. THE INSTALLER SHOULD CONSULT
WITH A STRUCTURAL ENGINEER PRIOR TO INSTALLATION TO
INSURE THAT THE WALL SURFACE CAN SUPPORT THE WEIGHT
OF THE 112/NAT OR 108/NAT AND ALL ASSOCIATED RIGGING
AND ALL REQUIRED SAFETY FACTORS. THE COMPOSITION OF

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THE WALL STRUCTURE
STRUCTURAL ENGINEER PRIOR TO INSTALLATION!

MUST BE REVIEWED BY A

STOP: The approved anchors (Fischer FAZ II 10/10 C) require

a minimum solid concrete wall thickness of 3.937 inches
(100mm). DO NOT mount the NAT loudspeaker to a solid
concrete wall if the wall thickness is not at least 3.937 inches
(100mm) thick!

The NAT products are approved for use with the FAZ II 10/10C
for WALL mounting only! DO NOT MOUNT FROM A CEILING!

STOP: USING FAZ II 10/10 C ANCHORS REQUIRES A
TORQUE WRENCH CAPABLE OF 33 FT-LBS (45MN) OF
TORQUE. THESE ANCHORS MUST BE TORQUED TO THIS
VALUE. DO NOT INSTALL IF YOU DO NOT HAVE A

TORQUE WRENCH!

NOTE: The anchors referenced below are for use in solid concrete ONLY!
DO NOT use with cinder block (CMU) wall construction!
NOTE: ALL installation instructions below are guidelines. It is necessary to read the

additional installation instructions provided by Fischer. Additional instructions may
be found on the One Systems web site in the Documentation section. The Natatorium
section is found in the Tech Papers/Install guides section under the onesystems.com
Documentation Tab. This document is ESR 2948.

IT IS NECESSARY TO READ ESR 2948 AND UNDERSTAND THIS
DOCUMENT PRIOR TO INSTALLATION.

INSURE THAT THE SOLID CONCRETE CONFORMS TO SECTION

5.0 OF ESR 2948 AND OBSERVE ALL REQUIREM ENTS IN THIS
“CONDITIONS OF USE” SECTION!

BRACKET LOCATION ON SOLID CONCRE TE WALLS
IMPORTANT NOTE: The mounting holes in the concrete
MUST be drilled at least 8 inches (203.2mm) away from any
edges or openings in the solid concrete wall! DO NOT drill
the bracket mounting holes in the solid concrete where
wall edges or openings in the wall are closer then 8 inches
(203.2mm)!

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Solid Concrete Anchors:

If the 108IM/NAT or 112IM/NAT are to be mounted on a solid concrete surface, then
approved concrete anchors must be used. The ONLY approved source for concrete anchors
is Fischer Fixings LLC. Do not substitute any other anchors!

The approved concr ete anchor s ar e as fol low s :
108IM/NAT Fischer FAZ II 10/10 C (the “C” is a designator for 1.4529 6% Mo stainless

steel)
112IM/NAT Fischer FAZ II 10/10 C (the “C” is a designator for 1.4529 6% Mo stainless

steel)

NOTE: ONLY HORIZONTAL MOUNTING IS PE RMITTED WHEN MOUNT ING ON SOLID
CONCRETE WAL LS! DO NOT MOUNT THE U-B RACKET IN A VERTICAL
ORIENTATION!

DO NOT MOUNT VERTICALLY ON SOLID CONCRETE WALLS
MOUNT BRACKET AND ENCLOSURE HORIZONTALLY ONLY!

NOTE: When mounting to a solid concrete wall ONLY one anchor per side on the U bracket
is permitted. DO NOT USE MORE THEN ONE ANCHOR PER SIDE (see im ag e below)

NOTE: Only certain holes on the U-bracket may be used and

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ONLY horizontal mounting is permitted. Dril l only ONE
mounting hole per side.

The 112/NAT U-bracket is shown below

Use ONLY one hole per side. Use either of the holes shown BUT not both holes.

NOTE: DO NOT DRILL MORE THEN ONE HOLE PER SIDE!

The images below show the mounting holes allowed.

Use these two holes ONLY!
OR

Alternately these two holes ONLY!

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The 108/NAT U-bracket is shown below

Use ONLY one hole per side. Use either of the holes shown BUT not both holes.

NOTE: DO NOT DRILL MORE THEN ONE HOLE PER SIDE!

The images below show the mounting holes allowed.

Use these two holes ONLY !
OR
Alternately these two holes ONLY

The required hole depth is 3 11/32 inches (85mm) and should be verified
prior to installation of the FAZ II 10/10C anchor! INSURE THAT THE
HOLE IS THE CORRECT DEPTH! This hole should be perpendicular
to the surface of the wall. DO NOT drill at an angle!

NOTE: Avoid drilling into rebar. Rebar locators may be rented from
many sources to determine the location of rebar in the solid concrete.