INSTALLATION – SOLAR COLLECTORS
44
WARNING: Plumber
– Be Aware
•
The solar hot and solar cold pipes between the solar storage tank and the solar collectors
MUST BE
of copper. All compression fittings must use brass or copper olives.
•
The full length of the solar hot and solar cold pipes
MUST BE
insulated.
The insulation must:
▪
be of a closed cell type or equivalent, suitable for a solar water heating application and capable
of withstanding the temperature of the water generated by the solar collectors under stagnation
conditions
The specification of the chosen insulation material should be checked with the insulation
manufacturer prior to installation as different materials may vary in temperature tolerance.
▪
be at least 13 mm thick
▪
be weatherproof and UV resistant if exposed
▪
extend through any penetrations in the eaves, ceiling and roof
▪
cover valves and fittings in the solar pipe work
▪
be fitted up to and cover the connections on both the solar storage tank and the solar collectors.
Note: Failure to observe these requirements also increases the risk of freeze damage.
Uninsulated pipe work, including concealed in cavities and roof spaces or where it may be in contact
with a metal roof, may lead to freeze damage. There is NO WARRANTY for freeze damage if the solar
hot and solar cold pipes are not insulated in accordance with the installation instructions.
The insulation is essential to assist in providing freeze protection, will offer protection to a metal roof
against corrosion due to water running off the copper pipes, assist in avoiding accidental contact with
the solar pipe work as very high temperature water can flow from the solar collectors to the solar
storage tank, and also reduce pipe heat losses.
•
The insulated copper pipe work:
▪
should be fixed at suitable locations to prevent or reduce the possibility of noise from water
hammer and vibration from occurring
▪
is not to be placed or installed in contact with plastic pipe work.
Likewise, plastic pipe work is not to be placed or installed in contact with the insulated copper
pipe work after the collector circuit is installed.
•
Plastic pipe
MUST NOT
be used, as it will not withstand the temperature and pressure of the water
generated by the solar collectors under stagnation conditions. Extremely high water temperatures of
up to 150°C for non-selective surface collectors and greater than 200°C for selective surface collectors
and high water pressures exceeding 1000 kPa can be generated under these conditions. Plastic pipe
cannot withstand these temperatures and pressures and
MUST NOT
be used. Failure of plastic pipe
can lead to the release of high temperature water and cause severe water damage and flooding.
•
The solar hot outlet and hot sensor connection is to be the highest point of the system. The highest
point of the solar hot and solar cold pipes must be where they connect to the solar collectors, to avoid
the possibility of air locks occurring in the system. There
MUST BE a continuous fall
in the pipe work
from the solar collectors to the solar storage tank. Horizontal runs of pipe work are acceptable and
may be installed as part of an open circuit system.
•
A non-return valve
MUST BE
installed on the cold water line to the solar storage tank
AFTER
the cold
water branch to a temperature limiting device.
•
The pressure applied to the collector circuit and solar collectors during a pressure test of an open
circuit system
MUST NOT
exceed 1000 kPa, otherwise damage may result. Refer to
on page 45.
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