surrounding temperature. Errors in temperature readings can cause improper operation
of the controller and poor performance of the equipment.
The low/OVT sensor for the collector circuit is installed on the solar tank at the factory.
Mount the high sensor on the return header of the last collector in the array as shown in
fig. 3.11.
Push the flat end of the sensor under the grommet into the collector box. Fasten the
sensor to the pipe with a band clamp or a piece of wire with twisted ends. Do not use
tape, it will let go under high temperature. Place the clamp over the flat part of the
sensor, not the round part to avoid crushing the body of the sensor.
Connect the hook-up wire to the sensor leads. Use wire nuts or crimp connectors and
fill with silicone sealant. Cover the sensor completely with the pipe insulation. Push the
insulation tightly against the collector box. The hook-up wire may be run on the outside
of the insulation and under the outer jacket down to the tank if desired. Caulk the jacket
to the collector box with silicone sealant to keep water out. This is the most important
sensor in the whole system, it must be very carefully installed.
HoloTech
tm
Solar Installation Manual
16
Glass
Collector Box
Grommet
Sensor
Header
Wire Tie
Figure 3.5 Collector Sensor Mounting
!
Figure 3.11 Collector sensor mounting.
