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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Flashing supply light.

A flashing supply light indicates a missing or broken High-Temperature Limit sensor. This sensor is required to make the APS-C series controller to work. It is required on all of the APS-C series controllers.

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Is a snow sensor required for a SC-40C?

by David Mays | Jul 26, 2017 |

APS-4C, APS-C Series FAQs, ice, SC-40C, sensor, snow

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No, the SC-40C does not use a snow sensor, it is completely controlled by the attached APS-4C. However, the SC-40C does require the High-Temperature sensor Thermistor to be connected (or bypassed with a 470K-ohm resistor) in order for the unit to...

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Can I simulate a sensor call for heat?

Yes, you can simulate a sensor call for heat to test the system by putting a jumper between pins 1 and 2 of the class two terminal blocks, the system will respond as if the sensor were seeing snow conditions. The snow and heat indicators will come...

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Why is my heater light flashing?

A flashing supply light on any APS or EUR-5A control indicates a missing or broken High Temperature Limit sensor. This sensor is required to make the EUR-5A controller to work. The sensor is not polarized and must be connected to pins 1 and 2. Refer...

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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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Can I shorten or extend the sensor wire?

by Joe Hektor | Jul 26, 2017 |

12 awg, #18 awg, extend, sensor, Sensor wire, SST-2 Heat Trace FAQs, wire

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Yes, the length of the sensor wire can be shortened or extended as long as:

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What voltages should I see when the sensor is connected to the controller and calling for snow?

This depends on the controller, on the newer APS-C series controllers, EUR-5A controller and the PRO series controllers they are supplied with 24VDC across the red and black wires (black is ground). The control signal coming back to the melt control...

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