10
GENERAL
7 .1 .3 Connections
ring nut
seal ring
male union
sensor pocket
seal ring
toward the
heat transfer
circuit
When tightening a fitting,
HOLD THE OPPOSITE
FITTING STEADY WITH
A SECOND TOOL
to avoid damage
seal ring
from the
heat transfer circuit
captive nut
Collectors in the same line must be connected so that the heat transfer fluid flows through them in series. The pipe to the
heat exchanger in the storage cylinder must be connected to the outlet with the temperature sensor socket on the last
collector in the line (see figure).
Lines of solar collectors can be connected either in series (provided each line contains no more than 6 collectors) or in
parallel. The complete circuit must always be hydraulically balanced. See the following sample layouts.
Two lines in series
Two lines in parallel
T
T
Diameter of connection pipes for a specific flow rate of 30 lt/m
2
h
Total surface area (m
2
)
2 - 4
6 - 12
14 - 20
Diameter of copper pipe
(mm)
10 - 12
14
18
Diameter of steel pipe (inch)
3/8" - 1/2"
1/2"
3/4"
b
If copper pipes are used, joints must be hot brazed.
b
We recommend the use of stainless steel pipes
specially made for solar collectors for the outlet,
return and probe pipes. The probe cable should be
of the shielded type.
b
Do not use plastic or multistrate pipes. Operating
temperature can exceed 180°C.
b
Pipe lagging must be able to resist high temperatures
(180°C).
