How do I set up my GPT for a RTD sensor?

The GPT unit comes with a thermistor (two thermistors with the GPT 230) but is also compatible a 2-, 3-, or 4-wire RTD sensor. The diagram illustrates the correct wiring and DIP switch configuration for each temperature sensor wiring scheme. It is...

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Temperature sensor was not installed

The high limit temperature sensor is intended for two purposes, either as a slab sensor when the APS-C series unit is used for heating sidewalks, patios or drives or for ambient air temperature when the unit is used for roof and gutter melt...

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Where do I connect the sensor wires to?

The sensor wires are connected to the blue #18 awg wires in the low voltage section. The sensor is not polarized so it does not matter which sensor wire goes to which blue wire.

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Supply light flashing on SST-2

A flashing supply light means that the temperature sensor is either missing or bad. Ensure that the sensor is correctly wired to the two blue wires. The system will not function without a sensor. Click here to see more about the Temperature sensor.

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Where should the temperature sensor be located?

Ideally, the temperature sensor should be located on the pipe on the opposite side from the heater. If this is not possible the sensor can be used as an ambient temperature sensor although it will be less efficient.

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How can I test the snow sensor?

The APS-3C and APS-4C controllers utilize the CIT-1 aerial snow sensor, the GIT-1 gutter snow sensor and the SIT-6E pavement snow sensor to detect weather conditions. All three of the sensors work in the same way, they require a temperature below 38...

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Set Your High Temperature Limit Control

Mary in Ohio upgraded the snow and ice melting system for her driveway with the Environmental Technology Inc. Snow Switch Model APS-3C control. The earlier version of her control panel did not include a HIGH TEMPERATURE LIMIT control setting. She...

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Sensor Selection for Radiant Snow Management Systems

At first glance, most snow melt applications appear to need only a single sensor. It addresses the fundamental concern for a radiant snow management system: "Is the weather bad enough to turn it on?" However, counterintuitively this can be a source...

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LCD-8 Wire Gauge Connections

Connecting ETI's Snow Switch® Model LCD-8 is a simple matter. Even for a nifty bit of controller technology.

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Troubleshooting the SIT-6E Snow Sensor

Environmental Technology Inc. demands the most and the best out of the products it manufactures and distributes. In a less than perfect world, however, less than ideal situations occur.

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