Vizio TWRS-I - Manual (Page 15)

Freeze Sensor (model TWRFS-I) Site Selection
To ensure optimum freeze sensor operation, the sensor module installation site should meet the
site criteria of the rain sensor in addition to the following conditions:
• Located in the coldest portion of the landscape.
• Away from direct exposure to morning sunlight.
• Away from any heat producing or storing device, equipment or appliance such as a pool/spa,
heater, water heater, chimney or hot air vent pipe.
CAUTION: The freeze sensor should be regularly inspected for freeze damage and
manually tested to ensure proper operation.
The freeze sensor system is NOT intended for farm/crop freeze protection and must not be
used for this purpose.
Important: Visual checks and prudent manual watering suspension must be used in
conjunction with any freeze sensor. A freeze sensor should only be relied upon as an aid to
conscientious watering practices, including frequent visual checks.
Air temperatures may be above freezing while the ground and vegetation temperatures remain
below freezing. Due to sensor location and sunlight exposure, actual air temperature may be
lower than measured by the sensor. Operation of the sprinkler system during these conditions may
cause icing. Freeze sensor response time may not coincide with extremely rapid temperature
drop, enabling automatic irrigation to occur.
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373-0372a_E/S/F 6/7/05 1:59 PM Page 13