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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