STIEBEL ELTRON SOL 25 PLUS - Manual (Page 13)

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5.2.0 Installation of 45° Mounts on Roofs, Walls,
or Ground
IMPORTANT: INSTALLED HEIGHT MUST NOT EXCEED 60 FEET.
CHECK THE ROOF STRUCTURE TO ENSURE PROPER SUPPORT FOR
COLLECTORS, MOUNTING HARDWARE, WIND LOADS, ETC. (STATIC
CALCULATION REQUIRED; IF NECESSARY, CONTACT THE BUILDER).
ALL ROOFING WORK MUST BE CARRIED OUT BY A PROFESSIONAL ROOFING
CONTRACTOR. WHEN WORKING ON ROOFS, OBSERVE ALL RELEVANT
SAFETY REGULATIONS, IN PARTICULAR: “SAFETY REGULATIONS FOR
WORK ON ROOFS” AND “SAFETY AND RECOVERY HARNESSES”V (OR LOCAL
REGULATIONS).
INSTALLERS MUST COMPLY WITH ALL LOCAL, STATE, AND NATIONAL
CODES.
ROPE MAY BE USED TO HOIST COLLECTORS, BUT MUST NEVER BE
ATTACHED TO THE COLLECTORS’ PIPES.
WHEN WORKING ON ROOFS, ALL RELEVANT SAFETY REGULATIONS MUST
BE OBSERVED.
Designers and installers should consider how rainwater, snow, and
ice accumulation is affected by the installation of the collectors and
mounting hardware. Collectors affect the flow of rainwater around
them, so appropriate means for conducting the water away from the
vicinity of the collectors must be provided. Collectors and mounting
hardware are also subject to accumulation of snow and ice in
cold climates. Installations must provide protection to people and
structures below the solar collectors to avoid hazards due to falling
snow and ice as it melts (or is blown off by winds). Installers must
also consider the possibility of snow and ice falling onto collectors
from any structures located above them and provide appropriate
means of protecting them.
Building materials adjacent to solar components must not be
exposed to the elevated temperatures that the collectors can
generate. Exposed components (that can readily be reached) must
be maintained below 140°F or otherwise be insulated/isolated. All
other exposed surfaces that can exceed 140°F should be labeled with
appropriate burn hazard warnings.
NOTICE: TO PREVENT EXCESSIVE PRESSURE DROP IN THE SOLAR
LOOP, NEVER LINK UP MORE THAN 5 COLLECTORS IN SERIES.
ARRANGE THE INDIVIDUAL LINEAR ARRAYS PARALLEL TO EACH OTHER.
Building penetrations for plumbing and mounting must not
impair enclosure integrity or functionality and must not allow
rodent or vermin intrusion. They must meet applicable codes and
National Roofing Contractors Assoc. practices. Structural members
penetrated by solar system components must not be compromised
and penetrations must meet code, particularly penetrations through
fire-rated construction. Do not reduce fire resistance below code.
Protect control sensor wiring.
Multiple Rows of Collectors:
If multiple arrays of collectors are being installed on a flat roof, one
behind another, the recommended spacing between them should
be:
• at least 25 ft. (7.6 m) for vertical
installation,
as shown in Figure 5.2.10; or
• at least 14 ft. (4.0 m) for horizontal installation,
as shown in Figure 5.2.11.
This spacing prevents excessive shading from adjacent rows for
latitudes of up to 50°. For latitudes significantly higher than 50°,
multiple rows of collectors may not be practical due to low sun
altitude angles.
Fastening To Structures
The type of roof or wall is a crucial factor in the choice of fasteners.
Remember to take the static and dynamic (live load) forces into
account.
The 45° vertical mounting racks can develop significant pull-out
forces under heavy wind conditions; therefore it is important to take
wind loads into account.
Force data for each collector:
Mounting Ht. Shear Force Tensile Force
Up to 26 ft.
(8m)
470 lbs.
(2.1 kN) 250 lbs.
(1.1 kN)
Up to 65 ft.
(20m)
790 lbs.
(3.5 kN) 700 lbs.
(3.1 kN)
Depending on the hardware, installers should consider distributing
the shear and tensile forces over the fastening surface with six
fasteners.
For anchoring in concrete, use six M8 UPAT Multicones or SM M10
anchors, both of stainless steel, per collector.
For anchoring in wood, use six wood screws in accordance with DIN
571, at least 10 x 80, of stainless steel, per collector.