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PIPE LENGTHS
The solar hot and solar cold pipes between the solar storage tank and the solar
collectors shall:
be of bendable grade or hard drawn copper tube.
Annealed or soft copper shall not be used.
Direct Open Circuit System: have a continuous fall from the solar collectors
to the solar storage tank. Horizontal runs of pipe work are acceptable and
may be installed.
not exceed the maximum recommended combined lengths as specified in
the table.
Maximum recommended total combined pipe length (solar cold + solar hot)
Pipe Size
Pipe Length
DN15
40 metres
DN20
For each additional 90° bend, reduce the maximum total pipe length by 0.5 m.
For each additional metre of pipe length, reduce the number of 90° bends by two.
Note: One 90° elbow is equal to two 90° bends.
NR – not recommended, NA – not available
Notes:
It is important not to cross connect the solar cold and solar hot pipes to the
incorrect connections at the solar collectors and at the solar storage tank.
The solar cold pipe connects to the bottom of the solar collector and may
connect to either the left or right hand side. The solar hot pipe must connect
to the top of the solar collector diagonally opposite to the solar cold pipe
connection.
Direct Open Circuit System: The hot sensor connection is at the solar hot
outlet where the solar hot pipe connects to the solar collector.
Refer to
"Warning: Plumber – Be Aware"
It is essential for these requirements to be followed for the system to operate
correctly and efficiently. Solar pipe work which is oversized, or is too long, or
does not have a continuous fall can result in a reduction in performance or the
system not operating effectively.
and number of 90° bends
1 or 2 Collectors
90° Bends
20
NR
NR
SOLAR COLLECTOR LOCATION
Pipe Length
30 metres
40 metres
on page 12.
11
3 Collectors
90° Bends
20
20
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