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13
Figure 10
COLLECTOR LOCATION
Proper location and orientation of the solar collectors is
important for maximum system effi ciency. The collec-
tors should be unshaded from 10:00 am through 3:00
pm each day in every month of the year and should be
located as close to the storage tank as possible to mini-
mize heat loss in the piping runs. The best orientation is
achieved when the collectors are facing due south +/- 45°
SOLAR COLLECTOR INSTALLATION
and tilted at an angle from the horizontal equal to the
latitude of the location + 15°. A steeper angle provides
better winter performance as the sun is lower in the sky.
The collectors will also shed snow more effectively at the
steeper angle. Figure 10 below shows many alternatives
for collector mounting. Placing the collectors as close
as possible to the peak of the roof will make installation
easier by providing increased attic access.
GENERAL CONSIDERATIONS
The contractor shall obtain all required permits and
approvals.
The installation shall conform to all federal, state and
local regulations, codes, ordinances and standards
governing solar water heating system installations and
the contractor shall adhere to sound building safety and
trade practices. Special consideration must be given
to building code requirements for the penetration of
structural members and fi re rated assemblies.
Ensure the mounting surface is solid and able to
withstand in excess of 330lbs / 150kg of pull force
that may be encountered during high winds. Consult
a structural engineer if in doubt.
The solar collector must be located in a structurally sound
area of the roof that will be unshaded for the majority
of the day all year round. Adjacent buildings and trees
should be checked for possible winter shading. An instru-
ment such as the Solar Pathfi nder (www.solarpathfi nder.
com) can be used for solar site analysis.
Before the installation the contractor shall inspect the
condition of the roof and notify the homeowner of any
existing roof damage or necessary repairs.