Thermo Products USDT2004 - Manual (Page 4)

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strap the sensor to the collector outlet pipe or the absorber (flat plate collectors) that projects from
the collector housing. Ideally, house the collector sensor (encased in a suitable sensor pocket)
into a T-piece on the collector return outlet. Protect the sensor cable from UV and moisture.
l Return (tank) sensor (white cable): The sensor required for the solar loop return is installed
in the lower part of the storage tank. If there is no provision for this tank sensor, push the sensor
beneath the insulation – keeping it close to the inner tank wall at the desire tank location.
For external heat exchangers, the tank sensor should be installed with an immersion sleeve in the
return leg (cold side) of the heat exchanger. In tanks with integrated heat exchangers, the sensor
pocket should be fitted at the exchanger's return to the collector.
l Pool sensor installation: Place a heat conductive T-piece on the suction line directly at the
pool outlet and screw in the sensor with an immersion sleeve (check corrosion resistance of the
material used). Alternately, attach the sensor with clips or adhesive tape, using the appropriate
thermal insulation to guard against environmental influences.
l Sensor cable extension: Sensor cables (22/4 AWG telephone cable, you need only two
wires of 4) can be extended up to 150 ft. A connection between the sensor and extension can be
established as follows:
Cut the supplied heat -shrinkable tubing to desired length (about ½ ”). Slide tubing over one end of
wire to be sliced (after removing enough outer insulation to accept the tubing). Splice the wire
and slide tubing over the splice. Heat gently all around until tubing shrinks tight.
Slide larger tubing (about ¾ “) over the entire completed splice. Heat gently all around until tubing
shrinks tight. This connection can then be drawn gently into the pipe work. Only two of the wires
are required for the sensor cable; the other two wires are spare wires.
Caution: Do not overheat the tubing! Remove heat as soon as the tubing shrinks tight, as
material will continue to shrink. With flame source, use even back and forth motion all around
tubing. A heat gun may be used, if available. Let tubing cool for maximum strength.
ontroller unit installation: For viewing comfort, the controller unit should be positioned
at eye level. For optimum longevity, avoid extremes of temperature in the placement of
electronic equipment. In addition, avoid heavy electrical loads, switches or contactors as these
may cause electrical and electromagnetic interference with the unit (when switched on or off).
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