Sigma I XL
Installation manual
Contents
Sigma I XL Installation manual
Sigma – A specialist in the open field
1
1.1
1.2
1.3
1.4
Introduction
Standards and certifications Definitions and Terminology Qualified personnel Warning indications 1
1
1
2
2
2
2.1 2.2 2.3
2.4 2.4.1
Safety
Intended use Responsibilities of the owner and installer
Specific safety warnings
Electrical bonding and grounding
Sigma I XL structure and component bonding
3
3
4
4
7
7
3
3.1 How to use the drawings in this manual
Notes
10
10
4
4.1
4.2
Sigma I XL components Components included
Individual components
11
11
11
5.
Project drawings and Bill of Materials
14
6.
6.1
6.2
6.3
Basic installation requirements
Tools required
Tightening torques
Site suitability
14
14
14
15
7.
7.1
7.2
7.3
7.4
7.5
7.6
Installation and assembly
Install piles
Install the Diagonal Strut Brackets
Attach the Upper Rafter Adapters
Install Rafter and Diagonal Strut
Install Module Bearing Rails
Install PV Modules
15
15
15
16
16
17
19
Sigma-I-XL-MA-USA-1308
1. Introduction
1.1 Standards and certifications
This installation manual describes the processes involved
with assembly, installation and maintenance of the
Mounting Systems, Inc. Sigma I XL mounting system for
photovoltaic (PV) arrays.
The Sigma I XL system as supplied complies all applicable
standards and certifications in force at the time of
manufacture, including those provided by:
• International Building Code (IBC) 2009
• California Building Code (CBC) 2010
• ASCE / SEI 7-10
• Aluminum Design Manual 2010
• ANSI / ATSC 360-05
• ACI 318-08
• ASTM D2487
Sigma I XL Installation manual
Please read this manual carefully. The manual, along with
the relevant project-specific Project Drawings and Bills of
Materials (BOM) provided by Mounting Systems, contains
the information necessary to complete the assembly and
installation of the product safely and correctly. Should
you have any questions regarding the product after reading this manual, please contact Mounting Systems, Inc. or
your Mounting Systems Sales Representative.
1.2 Definitions and Terminology
The following definitions and terminology are used in this installation manual.
Term
Definition
Photovoltaic system
A photovoltaic system consists of:
• photovoltaic modules
• module mounting system
• inverter(s) (optional)
• interconnection wiring
Mounting system
The mechanical structure used to arrange and
support the PV modules and, optionally, interconnection wiring and inverter(s). It also may include
anti-theft devices.
Optional
System parts, accessories or procedures which may
or may not be utilized depending on the particular
system, site or other factors
Project drawing(s)
Drawings supplied by Mounting Systems, Inc. specific
to a particular project or application. The Project
Drawings include the Bill of Materials (BOM) for the
particular project and system.
System parts
System parts include the parts supplied with the
system and which are listed on the BOM supplied
with the system.
Introduction
1
Sigma I XL Installation manual
1.3 Qualified personnel
1.4 Warning indications
Installation of the Sigma I XL system must be performed
by qualified personnel. Qualified personnel are those
who possess and have demonstrated competence in
mechanical assembly, installation and maintenance of PV
mounting systems or similar systems.
The following symbols are used throughout this manual
to warn of situations which, if not heeded, can result in
property damage, personal injury or death.
Qualifications also include knowledge of and competence
with: assessing and mitigating risks normally associated
with mounting system assembly and installation, safety
regulations and procedures and the operation of safety
devices and equipment.
DANGER
WARNING
CAUTION
CAUTION
2
Introduction
Indicates a situation or an action
that could lead to severe injury or
death.
Indicates a dangerous situation or
action which could lead to severe
injuries.
Indicates a situation or action
which could result in personal
injury and/or property damage.
Indicates a situation or action
which could lead to property
damage.
2. Safety
2.1 Intended use
The Sigma I XL system is intended for use exclusively as a
mounting system for PV modules on open terrain.
i
Intended use also includes the following:
NOTE!
Any installation, operation or maintenance not in accordance with this
installation manual or the above
requirements is deemed to be not
as intended and will result in forfeiture of any warranty claims.
• The Sigma I XL system is installed in accordance with
the technical specifications, Project Drawings and Bill
of Materials supplied with the system
i
• Modifications to the system or accessories are implemented only with the express consent of Mounting
Systems, Inc.
• Repairs to or replacement of components or accessories
are implemented only with components or accessories
provided by or expressly approved by Mounting Systems, Inc.
• Inspection and maintenance by qualified personnel on
an annual basis
i
Sigma I XL Installation manual
• The Sigma I XL system is installed and operated in
accordance with these installation instructions and applicable technical standards
NOTE!
Any other use of the product except
as noted above or expressly permitted in this installation manual is
deemed to be not as intended and
will result in forfeiture of any warranty claims.
NOTE!
Mounting Systems, Inc. will not be
liable for injury or damage due to
operation of the product that is not
as intended.
• Installation and operation within the intended design
load limits imposed by snow, wind and seismic activity
• Installation and operation in the soil conditions determined by qualified geotechnical testing to be of adequate load-bearing capacity and for which the Sigma
I XL system was designed
• Installation and operation in non-extreme environmental or site conditions; such extreme conditions
including but not limited to corrosive atmospheric conditions, fire, flood or other catastrophic events whether
natural or manmade
Safety
3
2.2 Responsibilities of the owner and installer
2.3 Specific safety warnings
The owner and installer of the Sigma I XL system
must ensure that:
The following safety warnings appear where appropriate
throughout this installation manual. Please observe and
heed the warnings prior to taking the actions or
performing the steps to which they apply.
• The installation of the Sigma I XL system
is carried out by qualified personnel only
Sigma I XL Installation manual
• Installation personnel have familiarized themselves
with the system, its components and materials
• These installation instructions are available throughout
the installation and assembly processes
warning
Risk of injury and material damage
due to improper inspection,
maintenance or repair
Inadequate or improper inspection,
maintenance or repair may jeopardize the operational safety of the
system!
• Ensure that inspection, maintenance and repairs are carried out
only by qualified personnel
• The installation personnel have read and understood
the safety instructions and warnings contained within
this manual
• Installation personnel utilize appropriate safety
apparatus and clothing during the installation and
assembly of the Sigma I XL
• Suitable lifting gear and other appropriate tools
are available during the installation and assembly
processes
Burn risk
warning
PV module surfaces exposed to the
sun will be hot!
• Wear appropriate protective
apparel
Risk of injury due to improper
material handling
CAUTION
4
Safety
Improperly or carelessly handled
material and components can cause
injuries including crushing, pinching, cuts and impacts.
• Be aware of structures and
personnel in the vicinity
• Observe good safety practices
• Wear appropriate safety
equipment and apparel
• Don't do stupid stuff!
Risk of cuts due to sharp edges
and corners
Fabricated metal may have extremely sharp edges and corners
that can cause deep cuts
• Be careful when lifting or carrying
metal parts
• Maintain awareness of nearby
sharp edges and corners
• Wear appropriate safety equipment and apparel
CAUTION
Attempting to climb or stand on the
Sigma I XL framework may lead to
slipping or falling, causing serious
personal injury and damage to the
system
• Do not climb on the system
• Use appropriate ladders, scaffolds
or other equipment to access
beyond arm's reach
• Use appropriate lifting equipment
• Don't be a dope
Sigma I XL Installation manual
CAUTION
Risk of personal injury and property damage due to climbing the
system frame
Risk of personal injury due to improper material storage or staging
CAUTION
Improperly stacked or stored system
components, rails and accessories
can topple or fall and cause serious
injury
• Do not stack or store system parts
so high that they are unstable
• Observe applicable codes and
regulations regarding stacking
and storing items
• Use appropriate storage bins,
shelving and storage locations
• Wear appropriate protective gear
and apparel
• Do not climb on or lean against
stored items
Transportation damage
attention
Improper transportation or material handling may result in damage
to the Sigma I XL system and the PV
modules
• Check the components and
packages for visible damage
• Note and register damage with
the carrier at the time of delivery
• Photograph the damage
• Notify Mounting Systems, Inc.
immediately
Safety
5
Risk of damage due to improper
installation
Sigma I XL Installation manual
attention
6
Safety
Improperly assembled Sigma I XL
mounting systems may be unstable
and fail, causing damage to the
system
• Use only the materials specified,
approved or supplied by Mounting
Systems, Inc. for the assembly and
installation of Sigma I XL
components
• Ensure that all components have
been installed correctly as described in the installation manual
• Improperly tightened bolted connections may fail
• Over-torqued connections my
break or deform causing failure of
the connection
• Under-torqued connections may
loosen leading to weakened
connections and structural
deformation and failure
• Note and comply with recommended torques for all bolted
connections
• Notify Mounting Systems, Inc.
immediately
Quickstone connection failure
attention
Quickstone connections ease and
speed component installation and
are an integral part of the Sigma I
XL's electrical bonding and grounding system but must be installed
properly for secure connections
• Read and follow Quickstone
installation instructions in this
installation manual
• Never "tap in" a Quickstone
component
• Ensure the Quickstone is properly
oriented in the Quickstone channel before tightening the bolt
• Observe and follow tightening
torque specifications.
Risk of module damage due to
thermal expansion/contraction
attention
Installing a PV Module across a
thermal expansion joint can damage the module when rail expansion and contraction occur
• Never install a module across an
expansion joint
• Ensure modules are installed only
by qualified personnel according
to the Project Drawings supplied
with the Sigma I XL system
2.4 Electrical bonding and grounding
Electrical bonding of module frames to the Sigma I XL
mounting rails is accomplished with third-party hardware certified as suitable for piercing the anodized
coating of the module frames or by other listed methods
approved by the module manufacturer. Mounting Systems, Inc. recommends the Burndy WEEB-CMC for module
to mounting rail bonding.
2.4.1 Sigma I XL structure and component bonding
The Sigma I XL system employs two means for bonding
the various components of the structure, Quickstone nuts
and star or serrated washers.
Safety
7
Sigma I XL Installation manual
The Sigma I XL system is designed with integrated electrical bonding of all component parts. This integrated
bonding requires adherence to these installation instructions, particularly in regard to proper installation and
tightening of the various Sigma I XL connection components.
Sigma I XL Installation manual
2.4.1.1 Quickstone bonding
bonding tooth
It is important that all Quickstone connections be tightened to the specified torque to insure proper electrical
bonding.
Figure 2.4 – 1 Quickstone nut
1
2
3
4
Figure 2.4 – 2 Quickstone nut installation in
Quickstone channel
8
Safety
Figures 1 and 2 show the profile of the Quickstone nut
and how it is installed in the Quickstone channel. The
small teeth on the Quickstone nut, when tightened,
break and seal the aluminum oxide coating on the millfinish components of the Sigma I XL system and provide
a high-ampacity connection. A serrated washer below
the head of the stainless steel Quickstone bolt bonds the
bolt to the Quickstone component (clamp, rail adapter,
etc.) which, in conjunction with the bolt thread’s contact
with the Quickstone nut provides secure bonding of the
components.
h
2.4.1.2 Component connection bonding
g
a
2.4.1.3 Grounding the Sigma I XL
d
c
f
e
Figure 2.4 – 3 Star washer bonding detail
Bolt
Flat washer
c Leg
d Star washer
e Flat washer
f Split washer
g Nut
h Rafter
a
Sigma I XL Installation manual
b
Electrical bonding of Sigma I XL components secured
with standard hex bolts and nuts is accomplished with
stainless steel star-washers. On preassembled components, the star washers are preassembled in their proper
locations. Bonding is achieved when the components are
installed and tightened to their specified torque settings.
Figure 3 shows the location of star washers in the preassembled Rafter and leg assemblies.
Sigma I XL grounding may be accomplished with the use
of the Burndy WEEB-Lug installed in any of the Quickstone channels on the completed Sigma I XL system
(recommended) or by other listed or approved methods
as appropriate for the particular installation.
2.4.2 Module frame bonding
b
Bonding anodized module frames to the Sigma I XL structure may be accomplished with listed or approved methods which pierce, remove or otherwise allow adequate
contact between the conductive aluminum of the module
frame and the Sigma I XL ground path. Mounting Systems,
Inc. recommends the use of the Burndy WEEB-CMC for
this purpose.
Safety
9
3. How to use the drawings in this manual
3.1 Notes
The following notes describe the organization and
purpose of the drawings and graphics in this manual:
Figure x.x Figures, drawings, renderings, etc. provide
Sigma I XL Installation manual
visual representations of the component or
procedure being described. The figures are
not necessarily to scale and are intended to
provide clarity only.
a
Within the figures, individual parts are labeled
with lower case letters corresponding to the
lettered descriptions or item names nearby.
1
Actions or procedures that must be
accomplished in a specific sequence are
identified with numbers, e.g. 1, 2, 3.
The action or procedure should be performed
in the numerical sequence.
The action or procedure should be performed in the
alphabetical sequence.
10
How to use the drawings in this manual
4. Sigma I XL components
4.1 Components included
In general, a Sigma I XL system always includes the items
shown in the typical system views below.
f
b
c
d
Sigma I XL Installation manual
a
e
Sigma I XL system components IPE W6 pile
Module Bearing Rail
Rafter
c Diagonal Strut
d Diagonal Strut Bracket
e IPE W6 pile
f Upper Rafter Adapter
g Module Bearing Rail Clamp (not shown)
h Module Mid and End clamps (not shown)
a
b
4.2 Individual components
The IPE post is the primary support for the Sigma I XL.
Note highlighted component mounting hole locations.
Figure 4.2 – 1 IPE W6 post
Sigma I XL components
11
Sigma I XL Installation manual
The upper rafter adapters connect the rafters
to the vertical posts.
Figure 4.2 – 2 Upper rafter adapter
The Diagonal Strut Bracket attaches the lower end
of the diagonal strut to the IPE post. Star washers
provide integral bonding of the bracket and post.
Figure 4.2 – 3 Diagonal Strut Bracket
The Diagonal Strut supports the outer (lower)
section of the rafter.
Figure 4.2 – 4 Diagonal Strut (shown preassembled to rafter)
Figure 4.2 – 5 Rafter
12
Sigma I XL components
The Rafter provides support for the Module Bearing rails.
The Rafter is preassembled with the Diagonal Strut to
speed installation. A star washer in the Rafter/Diagonal
connection provides integral electrical bonding of the
two components.
Sigma I XL Installation manual
The Module Bearing Rails support the modules and
provide anchoring for the module clamps. The "Pi" rail
is designed to allow reliable module mounting in both
portrait and landscape orientation.
Figure 4.2 – 6 "Pi" Module Bearing Rail
The Module Bearing Rail Clamp is used to connect the
Module Bearing Rails to the Rafters. The Quickstone nut
allows easy assembly and is part of the integral system
bonding of the Sigma I XL.
Figure 4.2 – 7 Module Bearing Rail Clamp
The Module Mid and End Clamps clamp the modules
to the Module Bearing Rails. End clamps are modulespecific and are available for modules from 33 – 50mm
thick. Mid clamps are available in three size ranges for
module thicknesses 24-32mm, 32-46mm and 46-51mm.
Quickstones provide fast, easy placement and attachment
of the PV modules and provide integral system bonding.
Figure 4.2 – 8 Module Mid and End Clamps
Sigma I XL components
13
5. Project drawings and Bill of Materials
Project-specific documentation is supplied as part of the
Sigma I XL system. It contains all the information necessary to install the system. The documentation includes:
• Bill of Materials (BOM)
Sigma I XL Installation manual
• System overview drawing(s) which show:
- the exact module configuration for the project
- component variations specific to the project
- specific foundation information for the project
- the parts supplied for bolted connections
specific to the project
- dimensions and clearances
6. Basic installation requirements
6.1 Tools required
The following tools are required for proper assembly and
installation of the Sigma I XL structure and PV modules:
• Ladder
• Power drill/driver, electric screwdriver
• Measuring tape
• Spirit level
• 6mm Allen key
• Socket / open-end wrenches
• Chalk line (optional)
6.2 Tightening torques
i
14
NOTE!
Torque values other than those specified here may be required for specific
project requirements. If so, those
values will be specified in the projectspecific documentation supplied with
the Sigma I XL system.
Project drawings / Basic installation requirements
A good quality torque wrench should be used to tighten
bolted connections to the torque settings shown below:
Bolt size
Recommended torque
M10
38 ft-lbf (53 N-m)
M8
Quickstone bolts 72 in-lbf
(8 N-m)
6.3 Site suitability
7. Installation and assembly
7.1 Install piles
6° max.
4° max.
Figure 7.1 – 1 Pile installation
Accurate foundation placement, pile height and plumb
are key to a successful Sigma I XL installation. Pile driving
should be done by a competent and experienced contractor.
Install the Sigma I XL piles according to the projectspecific documentation supplied for your project taking
care to maintain the tolerances allowed. In general, pile
height should not vary by more than +6 in. (15 cm) / -4
in. (10 cm). Ensure that the mounting holes for attaching
the Diagonal Strut Bracket on the post flanges face south
and that the holes for the Upper Rafter Adapters are at
the top.
7.2 Install the Diagonal Strut Brackets
Using two M10x30 bolts, lock washers and nuts, attach
the Diagonal Strut Brackets to the Piles as shown.
Basic installation requirements / Installation and assembly
15
Sigma I XL Installation manual
In general, a geotechnical evaluation of the project site
should be accomplished prior to ordering the Sigma I
XL system. The geotechnical report both confirms the
suitability of the site for the Sigma I XL installation and
allows for proper selection of the foundation spacing and
embedment depth.
7.3 Attach the Upper Rafter Adapters
Sigma I XL Installation manual
Using two M10x30 bolts, flat washers, lock washers and
bolts, attach the Upper Rafter Adapters to the piles as
shown. The slotted hole at the lower end of the Adapter
can be used to compensate for out-of-plumb piles or
uneven terrain. Tighten bolts only finger tight at this
time.
7.4 Install Rafter and Diagonal Strut
Note that the Rafter and Diagonal Strut are preassembled
at the factory.
Place the Rafter on the Upper Rafter Adapter and secure
it with an M10x70 bolt, flat washer, lock washer and
nut. Leave the bolt and nut finger tight at this time.
Position the lower end of the Diagonal Strut in the Diagonal Strut Bracket and secure it with an M10x70 bolt,
flat washer, lock washer and bolt. Tighten all bolts to the
recommended torque.
16
Installation and assembly
7.5 Install Module Bearing Rails
Module Bearing
Rail Clamps
i
Figure 7.5 – 2 Attaching module supports to rafter
i
Sigma I XL Installation manual
Using two M10x30 bolts, flat washers, lock washers and
bolts, attach the Upper Rafter Adapters to the piles as
shown. The slotted hole at the lower end of the Adapter
can be used to compensate for out-of-plumb piles or
uneven terrain. Tighten bolts only finger tight at this
time.
NOTE!
The project-specific documentation
supplied with the Sigma I XL provides
information for positioning the Module Bearing Rails on the Rafters. Using
this information, position the Module
Bearing Rails on the Rafters using the
Module Bearing Rail Clamps.
NOTE!
The Module Bearing Rail Clamps use
Mounting Systems’ patented Quickstone technology. The Quickstone
(shown below) may be inserted in the
Quickstone channel in the top of the
Rafter at any point along the channel.
Tightening the Quickstone bolt 2-3
turns secures the Quickstone in the
channel but still allows it to slide in
the channel to its final position.
Installation and assembly
17
Quickstone installation
Figure 7.5 – 2
Inserting module support
clamp
b
a
c
Sigma I XL Installation manual
d
Module Bearing Rail
Module Bearing Rail Clamp
c Quickstone
d Rafter (Rafter shown is not
representative of Sigma I XL
Rafter)
a
b
Figure 7.5 – 3
Attaching module
supports, inserting
module support clamps
into the Quickstone
channel
1
To insert a Quickstone, first ensure that the bottom of the
bolt does not protrude below the Quickstone body. Note
the shape of the Quickstone channel and the orientation
of the Quickstone in the diagram below. Insert the Quickstone into the channel as shown. Then move the Quickstone so that the "J" of the Quickstone engages the hookshaped portion of the rib in the center of the Quickstone
channel. Holding the Quickstone in this position, tighten
the bolt 2-3 turns. The component is now secured in
the channel but may still be moved to its final position.
Once the Quickstone component is moved into its final
position, the bolt may be tightened to the recommended
torque setting to secure the component in position.
1
Insert Quickstone in channel
2
Slide Quickstone "J" into engagement with corresponding element in Quickstone channel
2
Module Bearing Rail Installation
Using the procedure below, install the Module Bearing
Rails.
• Locate and mark position of lower Module Bearing Rail
on Sigma I XL Rafters. (A chalk line may be useful to
mark the Rafters quickly).
• Insert a Module Bearing Rail Clamp in the easternmost
and westernmost Rafter Quickstone channels below the
location of the Module Bearing Rail. Tighten the Quickstone bolts 2-3 turns to hold the Clamps in position
but still allowing them to slide.
• Position the Module Bearing Rail.
• Holding the Module Bearing Rail in position, slide the
Module Bearing Rail Clamps up and capture the upraised lip on the Module Bearing Rail in the slot on the
Module Bearing Rail Clamps.
18
Installation and assembly
• Tighten the Quickstone bolts to secure the Rail
in position.
• Insert Module Bearing Rail Clamps into the Rafters
above the Rail and secure them to the Rail and Rafters
as above.
• Tighten the Quickstone bolts to 72 in-lbf (8 N-m).
Repeat the above procedure for the remaining
Module Bearing Rails.
7.6 Install PV Modules
PV Modules should be installed beginning at the end of
a module row. Installation can begin from either end of
the Sigma I XL structure.
i
NOTE!
When properly assembled the Sigma
I XL structure is integrally electrically
bonded. However, PV modules require
a separate bonding method to connect the frames of the PV modules to
the Sigma I XL structure. This bonding
may be accomplished per the use of
lay-in lugs and wire as detailed in the
installation manuals for most PV modules. Mounting Systems recommends
the use of Burndy (Wiley) WEEB-CMC
(Washer, Electrical Equipment Bonding) clips. If WEEB-CMC clips are to be
used, please consult the appropriate
installation instructions provided by
Burndy to ensure proper electrical
bonding of the Sigma I XL.
i
NOTE!
The Module Mid and End Clamps use
Mounting Systems’ patented Quickstone technology. The Quickstone
(shown below) may be inserted in the
Quickstone channel in the top of the
Rafter at any point along the channel. Tightening the Quickstone bolt
2-3 turns secures the Quickstone in
the channel but still allows it to slide
in the channel to its final position.
See Quickstone Installation above for
proper Quickstone installation.
Installation and assembly
19
Sigma I XL Installation manual
• Insert Module Bearing Rail Clamps in the remaining
Rafters, above and below the Rails and secure them.
PV Module Installation - Portrait Orientation
Use the following procedure to install PV modules on the
Sigma I XL in portrait orientation.
Sigma I XL Installation manual
Module End Clamp
• Insert a Module End Clamp onto one end of each rail of
the lower pair of Module Bearing Rails and tighten the
Quickstone bolt 2-3 turns to hold the clamp in the rail
while still allowing it to slide.
Module Bearing Rail
Figure 7.6 – 1 Inserting module end clamps
PV module
Module end clamp
• Place module on rail pair and slide it flush against the
vertical side of the Module End Clamp.
• Hold the module and Clamp firmly together and tighten
the Quickstone bolt in each End Clamp to 72 in-lbf
(8 N-m).
Module support
Figure 7.6 – 2 PV module inserted into module end clamp
Inter-module clamps
Figure 7.6 – 3 Inserting the inter-module clamps into the
Quickstone channel of the module support
20
Installation and assembly
• Insert a Module Mid Clamp into each of the Module Bearing Rails on the other side of the PV module and tighten
the Quickstone bolts 2-3 turns to hold the Clamps in the
rails while still allowing them to slide.
• Slide the Mid Clamps flush against the side of the
PV module.
• Place the next PV module on the rails and slide it flush
against the Module Mid Clamps.
If WEEB-CMC bonding clips are to be
used, the WEEBs should be installed
onto the Mid Clamp Quickstone bolt
and positioned properly between the
bottom of the PV module frames and
the Sigma I XL Module Bearing Rails.
• While holding the PV modules firmly in place, tighten
the Module Mid Clamp Quickstone bolts to 72 in-lbf
(8 N-m).
• Continue installing PV modules as above until the row
is complete. A Module End Clamp is used to secure the
outside edge of the last module in the row in the same
fashion as the first module in the row.
Additional rows on the Sigma I XL structure are installed
as above.
Figure 7.6 – 4 Attaching further modules
Installation and assembly
21
Sigma I XL Installation manual
i
NOTE!
PV Module Installation – Landscape Orientation
For landscape orientation, the Module Bearing Rails are
installed as above and in accordance with the projectspecific documentation supplied with the Sigma I XL.
The Sigma I XL Pi Module Bearing Rails are designed to
accommodate both portrait and landscape installation.
Sigma I XL Installation manual
Use the following procedure to install PV modules in
landscape orientation:
• Insert two Module End Clamps into the lower Module
Bearing Rail at the positions corresponding to the PV
module's recommended mounting points.
• Tighten the Quickstone bolts 2-3 turns to hold the
Clamps in the Rail but still allowing them to slide.
• Place a PV module onto the Module Bearing Rail and
position the side of the module flush against the
vertical side of the End Clamp.
• Tighten the End Clamps to 72 in-lbf (8 N-m).
• Insert two Module Mid Clamps into the Module Bearing
Rail on the other side of the module at the recommended mounting points for the module. Tighten the
Quickstone bolts 2-3 turns to hold the Clamps in
position in the Rail.
• Place the next module in the column flush against the
Mid Clamps.
i
NOTE!
If WEEB-CMC bonding clips are to be
used, the WEEBs should be installed
onto the Mid Clamp Quickstone bolt
and positioned properly between the
bottom of the PV module frames and
the Sigma I XL Module Bearing Rails.
• Tighten the Mid Clamps to 72 in-lbf (8 N-m).
• Install the remaining modules in the column as above,
completing the column with End Clamps at the
topmost rail.
• Install the remaining columns of modules as above.
22
Installation and assembly
It is recommended that all bolted connections be
checked again for proper tightness.
Sigma I XL Installation manual
Assembly and installation of the Sigma I XL is now
complete.
Installation and assembly
23
Mounting Systems, Inc.
820 Riverside Parkway
West Sacramento, CA 95605
Phone 1 855 731 9996
info-us@mounting-systems.com
www.mounting-systems.com
Subject to change without notice
2013 © Mounting Systems, Inc.