2020 Installation Guide

BI 7.2.3-46
Feb-2021, Rev 14
BI 7.2.3-46
Feb-2021, Rev 14
16
NOTE!
When selecting QRail configuration, insure
the modules have the appropriate ratings
for the project site conditions in the selected
configuration. Check the module installation
manual to determine if the clamping area falls
within the acceptable range for the project design
loads.
Precise rail positioning and alignment is critical
when installing shared rail systems. Roof
attachments which are adjustable in the N-S
direction are recommended when installing
shared rail systems.
5. Installation of Roof Attachments and QRails
The roof attachments are attached to the roof structure and support the QRails. The permissible distance between the
roof attachments depends on several factors and must be calculated specifically for each project. Roof attachments are
available for a wide variety of roof types. In many cases, additional items may be required to accomplish flashing or other
weather sealing. Suitable products are available from a number of sources. It is the responsibility of the installer to select the
appropriate products and to install them correctly.
5.1 Select QRail Configuration
Image 5.1.1-1 shows a typical standard rail configuration. In this configuration, a
row of modules is supported by two rails under each row of modules. In areas with
exceptionally high snow or wind loads it may be necessary to support the modules with
three rails, image 5.1.1-2. Can be installed in both flush mounted or at an angle to the
roof. See the QRail Tilt Supplemental Installation Guide at quickmountpv.com.
Standard Rail Configuration
The rail design of the QRail system allows the use of shared
configurations for the Standard rail with standard mid and end clamps.
In this configuration, a single rail supports two rows of modules as
shown in Image 5.1.2. Shared rails may be used for both landscape
and portrait array configurations. See the Shared Rail Supplemental
Installation Guide at quickmountpv.com
Shared Rail Configuration
Image 5.1.1-1
Two-rail configuration
Image 5.1.2
Shared rail configuration
Image 5.1.3
Modified shared rail configuration
Modified shared rail configuration is a hybrid of standard
and shared rail configurations, image 5.1.3. The first and last
rail are set back from the end of the modules in standard
module clamping zones to provide additional adjustability
while the remaining rails are in shared rail configuration.
This configuration maintains the benefits of shared rail
configuration using the same clamps, 25% less rails, and full
array bonding. May be used for both landscape and portrait
module orientations. See the Shared Rail Supplemental
Installation Guide at quickmountpv.com
Modified Shared Rail Configuration
Image 5.1.1-2
Three-rail configuration