SunEarth RexRack User manual

1 November, 2014 Rev.C
RexRack
SunEarth RexRack Installaon Manual
Thank you for purchasing SunEarth’s RexRack System. The
use of all stainless steel hardware and 6063-T6 structural alu-
minum make SunEarth’s RexRack a simple, strong and dura-
ble solution for your racking needs. It accommodates tilt an-
gles from 20°to 60°from horizontal and is compatible with all
SunEarth solar collectors.
The RexRack components consist of 6063-T6 anodized alumi-
num mounting feet, support strut, rear leg as well as collec-
tors clips and stainless steel fasteners that can withstand the
harshest weather conditions. The components have factory
machined holes to expedite field installation.
SunEarth’s RexRack has been designed to allow installation on
all roof types. Always maintain a tilt angle greater than 10°
from horizontal.
RexRack should not be used in areas that experience positive
panel loading (snow) greater than 60 psf or negative panel
loading (wind) greater than 60 psf. If expected loading ex-
ceeds these values please contact SunEarth for other mount-
ing options.
The use of mounting systems that do not conform to the ma-
terials and methods detailed in this or any of SunEarth’s other
published installation manuals, guidelines, and technical bul-
letins is not recommended and may void your collector war-
ranty.
SunEarth RexRack
Low Slope Roof Installation

2 November, 2014 Rev.C
RexRack —Location
The optimal siting of the solar collector is facing true south. If
this is not possible the annual performance will suffer very little
if the collector is oriented no more than 45°east or west of
true south.
The solar collector should be placed on the roof in an area and
orientation that minimizes wind and snow loading. Wind loads
are highest near the edges and ridge of the roof. It is not ad-
visable to install solar collectors in locations 2 (yellow) and 3
(red) on the plan view shown on the left.
Example: If the installation site has a roof that is 35 feet wide,
60 feet long and has a mean roof height of 30 feet.
10% of “LHD” = 0.10 X 35 = 3.5
4% of “LHD” = 0.04 X 35 = 1.4
40% of “MRH” = 0.40 X 30 = 12
a = 3.5 feet since 1.4<3<3.5<12
Therefore collectors should be installed at least 3.5 feet away
from any roof peak or edge.
S
Flat Roof 20° ≤ Collector Tilt ≤ 60°
Gable Roof 20° ≤ Collector Tilt ≤ 60°
Note: If either the roof length or width is less than 30 feet
then “a” is equal to 3 feet. Otherwise dimension “a” is 10% of
the least horizontal dimension ”LHD” or 40% of the mean roof
height “MRH” whichever is smaller, but not less than either 4%
of the least horizontal dimension of the building or 3 feet as
stated in Minimum Design Loads for Buildings and Other Struc-
tures, American Society of Civil Engineers (ASCE) 7-05.

3 November, 2014 Rev.C
RexRack —Tilt Kit Components
Additional Required Parts (Not Included in Flush Mount Kit)*
(8 X Stainless Steel Lag Bolt, 8 X Stainless Steel Flat Washer, Roof Sealant)
Includes
Verify that all components shown to the
left have been received before proceeding
with installation.
Note: Mounting Feet should never be at-
tached directly to the roof surface without
best practice flashing methods. Roof at-
tachment products such as standoffs,
hanger bolts, etc. should be implemented
to allow proper flashing.
123
45
6
2
23
Front Foot Assembly Part # MTG-FF-BA
Qty. Descripon
11 ea. Front Hinge Bracket (Black Anodized Shown)
21 ea. Fastener Assembly
31 ea. Mounng Foot (Black Anodized Shown)
Table 1
Rear Telescoping Leg Assembly Part # MTG-RTL-2441/3865/5897/86122
Qty. Descripon
22ea. Fastener Assembly
31 ea. Mounng Foot (Black Anodized Shown)
41 ea. Rear Hinge Bracket (Black Anodized Shown)
51 ea. Rear Leg Slider (Black Anodized Shown)
61 ea. Rear Leg (Black Anodized Shown)
Table 2

4 November, 2014 Rev.C
The Collector Mounting Assembly (C-SSN)
attaches the collector to the RexRack, 4
required per collector.
RexRack —Additional Components
Additional Required Parts (Not Included in Flush Mount Kit)*
(8 X Stainless Steel Lag Bolt, 8 X Stainless Steel Flat Washer, Roof Sealant)
Support Strut
Example: 10070-158-324-BA = 1-5/8” Support Strut 27’ in Length and Black Anodized
Support Strut Splice*Optional C-SSN
The Support Strut Splice (MTG-SPLICE-8)
is used to extend the Support Strut for
lengths greater than 27 feet or as re-
quired.
The Support Strut (10070-###-###-XX)
is used to support the collectors in addi-
tion allowing for attachment of the Front
Foot Assembly (MTG-FF-XX)and Rear Tel-
escoping leg Assembly (MTG-RTL-
2441/3865/5897/86122).
4 Required per Collector
The Self Drilling Screws (14BW12X3/4)
are used to both fix the length of the rear
telescoping legs and secure the hinges to
the Support Strut. See Table 3
Self Drilling Screw
SunEarth Part # Required Number of Screws
MTG-FF-XX 3
MTG-RTL-XXXX 5
The Support Strut Splice (MTG-SPLICE-8)
is used to extend the Support Strut for
lengths greater than 27 feet or as re-
quired.
Table 3
Note: Mounting Feet should never be at-
tached directly to the roof surface without
best practice flashing methods. Roof at-
tachment products such as standoffs,
hanger bolts, etc. should be implemented
to allow proper flashing.

5 November, 2014 Rev.C
RexRack —Assembly Details
Additional Required Parts (Not Included in Flush Mount Kit)*
(8 X Stainless Steel Lag Bolt, 8 X Stainless Steel Flat Washer, Roof Sealant)
Rear Foot
The Front Foot assembly consists of the
Front Hinge Bracket nesting in the Front
Foot and attachment with one (1) fastener
assembly per front foot. The low support
strut is then nested in the Front Hinge
Bracket and secured with three (3) self-
drilling screws as shown.
Leg Attachment
Front Foot
The Rear Foot sub-assembly consists of
the Rear Telescoping Leg being nested in
the Rear Foot and attachment with one
(1) fastener assembly per foot.
The Leg attachment consists of the Rear
Hinge bracket nesting in the Rear Tele-
scoping Leg and attachment with one (1)
fastener assembly per leg. The upper sup-
port strut is then nested in the rear Hinge
bracket and secured with two (2) self-
drilling screws.

6 November, 2014 Rev.C
RexRack —Layout
Portrait Configuration Only
SunEarth’s RexRack is not an appro-
priate mounting solution for loca-
tions that experience positive panel
loading (snow) greater than 60 psf
or negative panel loading (wind)
greater than 60 psf. If expected
loading exceeds these values please
contact SunEarth for other mounting
options.
SunEarth’s RexRack layout is out-
lined for the different RexRack mod-
els dependent on collector and de-
sired tilt angle. Please reference ap-
propriate sheet for your application.

7 November, 2014 Rev.C
RexRack —Support Strut Length, Copper Coupling
Calculate the required length of the
Support Struts (10070-###-###-
XX). This will be the widest feature
of the row. The length of the support
strut follows the formula outlined
below.
Support Strut
SunEarth Collector # Header Length (h)
EC/EP/SB-40-XX 51.375”
EC/EP/SB-32-XX 51.375”
EC/EP/SB-24-XX 39.75”
EC/EP-21-XX 43.375”
Support Strut Length =
(# of Collectors) * (h + 0.125”) - (0.875”)
Example: Given (6) SunEarth EP-
40 collectors. Required length of each
Support Strut = (6*(51.375+.125-
.875= 309.875”
In this example two options are avail-
able.
1. A single 27’ piece of Support Strut
(10070-158-324-BA).
2. Two pieces of 158” Support Strut
(10070-158-158-BA) with a Sup-
port Strut Splice (MTG-SPLICE-8)
to connect the 2 sections.
1.25” BEYOND COLLECTOR
LENGTH OF SUPPORT STRUTS
HEADER LENGTH (h)
Table 4
Quanty
SunEarth Collector # 123456
XX-40-#.## 10070-158-052-
XX
10070-158-104-
XX
10070-158-158-
XX
10070-158-244-
XX
10070-158-288-
XX
10070-158-324-
XX
XX-32-#.## 10070-158-052-
XX
10070-158-104-
XX
10070-158-158-
XX
10070-158-244-
XX
10070-158-288-
XX
10070-158-324-
XX
XX-24-#.## 10070-158-052-
XX
10070-158-082-
XX
10070-158-120-
XX
10070-158-158-
XX
10070-158-204-
XX
10070-158-244-
XX
XX-21-#.## 10070-158-052-
XX
10070-158-104-
XX
10070-158-158-
XX
10070-158-204-
XX
10070-158-244-
XX
10070-158-288-
XX
SunEarth Collector # Header Length (h)
XX-40-#.## 51.375”
XX-32-#.## 51.375”
XX-24-#.## 39.375”
XX-21-#.## 43.375”

8 November, 2014 Rev.C
RexRack —Support Strut Length, Union
Calculate the required length of the
Support Struts (10070-###-###-
XX). This will be the widest feature
of the row. The length of the support
strut follows the formula outlined
below.
Support Strut
(UNION-SET-1) Support Strut Length =
(# of Collectors) * (h + 0.25”) + (2.5”)
Example: Given (6) SunEarth EP-
40 collectors. Required length of each
Support Strut = (6*(51.375+.25)
+2.5) = 312.25”
In this example two options are avail-
able.
1. A single 27’ piece of Support Strut
(10070-158-324-BA).
2. Two pieces of 158” Support Strut
(10070-158-158-BA) with a Sup-
port Strut Splice (MTG-SPLICE-8)
to connect the 2 sections.
1.25” BEYOND COLLECTOR
LENGTH OF SUPPORT STRUTS
HEADER LENGTH (h)
Table 4
(UNION-SET-1.5) Support Strut Length =
(# of Collectors) * (h + 0.375”) + (2.5”)
Quanty
SunEarth Collector # 123456
EC/EP/SB-40-XX 10070-158-052-
XX
10070-158-104-
XX
10070-158-158-
XX
10070-158-244-
XX
10070-158-288-
XX
10070-158-324-
XX
EC/EP/SB-32-XX 10070-158-052-
XX
10070-158-104-
XX
10070-158-158-
XX
10070-158-244-
XX
10070-158-288-
XX
10070-158-324-
XX
EC/EP/SB-24-XX 10070-158-052-
XX
10070-158-082-
XX
10070-158-120-
XX
10070-158-204-
XX
10070-158-204-
XX
10070-158-244-
XX
EC/EP/SB-21-XX 10070-158-052-
XX
10070-158-104-
XX
10070-158-158-
XX
10070-158-204-
XX
10070-158-244-
XX
10070-158-288-
XX
SunEarth Collector # Header Length (h)
EC/EP/SB-40-XX 51.375”
EC/EP/SB-32-XX 51.375”
EC/EP/SB-24-XX 39.75”
EC/EP-21-XX 43.375”

9 November, 2014 Rev.C
RexRack —Splice Information
7
7
8
Support Strut is available in lengths
up to 27’. If the calculated Support
Strut length is longer than 27’ then
a Support Strut Splice must be im-
plemented.
Support Strut Splice*Optional
For 1-5/8” Support Strut the Sup-
port Strut Splice MTG-SPLICE-8 is
used by sliding the splice into one
Support Strut until touching the riv-
eted stop, shown in RED for illustra-
tive purposes. Then the other Sup-
port Strut is slid onto the splice until
it touches the rivet stop.
The Support Strut Splice MTG-
SPLICE-8 has been designed so that
no additional fasteners are required
while continuing to allow for thermal
expansion and contraction of the
Support Strut.
7
7
8
SunEarth Part # Descripon
710070-###-###-XX Support Strut
8MTG-SPLICE-8Support Strut Splice
Table 5

10 November, 2014 Rev.C
RexRack —EC/EP/SB-40 Layout
RexRack Layout Dimensions
Table 6 provides detail on the proper
placement of the RexRack feet for
SunEarth Collector(s).
If the rafter spacing is not 16” or 24” on
center, position the RexRack feet such
that the collector “overhang” is less than
12”. The maximum allowable Leg Spac-
ing (E) is 60” on center for installations
utilizing 1-5/8” Solar Strut.
Raer SpacingEC/EP/SB/TRB/IS/IC—40
Leg 90° from Collector Leg 70° from Collector Leg Spacing (E)
Tilt Angle (B) Leg Length (A) Foot Spacing (C) Leg Length (A) Foot Spacing (D) 16" 24"
20 33.4 97.6 31.4 86.2 48 48
25 42.8 101.2 38.9 86.5 48 48
30 52.9 105.9 46.6 87.5 48 48
35 64.2 111.9 54.5 89.2 48 48
40 76.9 119.7 62.7 91.7 48 48
45 91.7 129.7 71.5 95.1 48 48
50 - - 81.1 99.5 48 48
55 - - 91.7 105.2 48 48
60 - - 103.7 112.5 48 48
SunEarth Collector Part # EC/EP/SB-40
Note: All tilt angles are taken for the
racking only, relative to horizontal. Roof
pitch must be added or subtracted as
appropriate to calculate the collector tilt.
A general rule of thumb is collector tilt
should be equal to local latitude plus
10°.
E
Table 6
Rear Telescoping Leg Assembly Part # MTG-RTL-2441/3865/5897/86122
Adjustment Range
MTG-RTL-2441-XX 24” to 41”
MTG-RTL-3865-XX 38” to 65”
MTG-RTL-5897-XX 58” to 97”
MTG-RTL-86122-XX 86” to 122”
Table 7