Delay between SC-40C and APS-4C?

by David Mays | Jul 26, 2017 |

APS-4C, APS-C Series FAQs, delay, SC-40C

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Why is there a delay between when the APS-4C turns on and when the SC-40C comes on?

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Snow light on SC-40C stays on longer than APS-4C

by David Mays | Jul 26, 2017 |

APS-4C, APS-C Series FAQs, SC-40C, snow, snow light

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The snow light stays on longer for the SC-40C than the APS-4C because the APS-4C gets its command from an actual snow sensor where the SC-40C’s get their command from the APS-4C.

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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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How do I connect my SC-40C to my APS-4C?

by David Mays | Jul 26, 2017 |

APS-4C, APS-C Series FAQs, connect, SC-40C

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APS-4C to SC-40C connections are done on the Class 2 terminal blocks on both units as follows.

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Why is the GFEP light flashing on my APS-4C?

This indicates that there is a ground fault on one of the attached SC-40C satellite controllers. The SC-40C that has the ground fault will have a solid red GFEP light and will not allow the heaters to be powered. Isolating the heater leg that has...

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En-Lightening APS-4C and SC-40C

Environmental Technology Inc.'s David Mays shares his insights on specific or unanticipated situations end users encounter with their ETI products. Here he illuminates the tricky mix of APS-4C and SC-40C status lights and system operations.

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When the system was installed the high temperature sensor was not installed, can I still make the unit work?

The high temperature sensor is intended for two purposes, either as a slab sensor when the EUR-5A is used for heating sidewalks, patios or driveways or for ambient air temperature when the unit is used for roof and gutter melt systems.

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Why doesn’t adjusting the High Temperature Limit dial turn the unit on?

The high temperature limit dial is used to set the maximum temperature that the unit will work at. When the High temperature limit sensor detects a temperature higher than what is selected on the dial it overrides the system and shuts it off. This...

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Can I use the APS-4C to drive external contactors for more circuits?

No. Doing so will cause the GFEP circuit on the APS-4C to detect the inductive load of the contactor coil as ground fault and alarm the system every time the contactor is turned on.

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Is there a way to make the system come on with temperature only?

The APS C series systems are designed to turn on and off, as the weather requires heat to deal with snow or icing conditions. Although a thermostatic dry contact switch can be used to override the system on for temperature alone, is not recommended...

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