P.12
If an electrical potential exists between the roof
and ground, this may induce current in the col-
lector sensor wire. This current will result in
a false signal being received by the controller
and hence incorrect temperature readings. To
prevent such current the copper plate and pip-
ing should be independently grounded. This
will provide a separate path to ground from the
roof which does not interfere with the sensor
readings.
Grounding can be achieved by running a sepa-
rate ground wire to the collectors or ensur-
ing that the copper pipe in the closed loop is
grounded and there are no electrical disconti-
nuities between the grounding point and the
collector. Grounding of the collector & roof
piping is especially important in locations that
often experience electrical storms and electrical
atmospheric activity.
4.6.3 Low Voltage Wiring
The low voltage wiring used to connect the sen-
sor lead to the controller shall be a minimum18
AWG. The wiring should be bare or tinned cop-
per, two conductor, stranded, PVC insulated,
with a PVC UV rated jacket suitable for exterior
use. In locations that often experience electrical
storms and electrical atmospheric activity the
low voltage sensor wire should also be shielded
and the shielding connected to ground.
A
REAR LEG
FOOT
SUPPORT STRUT
DETAIL A
COLLECTOR
MOUNTING
CHANNEL
C-SSN
FOOT
LANDSCAPE RACK
fig. 10
