33
Maintaining a 24-Hour Fan-Aspirated Radiation Shield
The 24-hour fan draws in outside air.
To clean it, disassemble the shield and clean interior surfaces as necessary to prevent
dirt build up. Check to make sure the fan is running by carefully listening for it. The
motor is very quiet. See “24-Hour and Daytime Fans: Replacing the Fan Motor and
Batteries” on page 40.
To thoroughly clean the 24-Hour Fan-Aspirated Radiation shield:
Tools and supplies needed:
• Medium Phillips-head screwdriver (and a small Phillips-head screwdriver if you are
also replacing the batteries)
• Adjustable wrench
• Soft, damp cloth
• Soft brush (such as a toothbrush)
You will not need to remove the rain collector base from the pole or post on which it
is mounted. You will be able to remove the entire radiation shield so that you can
clean it and access the temperature/humidity sensor, the fan, and the fan batteries.
1. Open the transmitter shelter, remove the foam insert and unplug the temperature-
humidity cable from the sensor interface. Pull the cable down through the
access hole and out of the shelter.
Tip: You can also remove the transmitter shelter door by unplugging the solar panel
cable. Then you can use the transmitter shelter door to store screws, washers, and
spacers as you remove them.
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