The neutral on GFEP/GEFP/RCCB 240V breakers is not used, why do I need this then?

A 2 pole single-phase 240V circuit works by continuously monitoring the current flowing through both hot wires of the circuit. If it detects even a slight imbalance between the current on each hot wire (indicating a ground fault), it will quickly trip, cutting off power to the circuit. Essentially, it compares each leg of the 240V circuit and trips if they are not precisely equal.

What is the purpose of the Low Temperature Lockout Feature on certain snow melt controllers?

This feature prevents the snow melting system from running, by default, in temperatures below 17°F (–8.33°C), or as set by the user. At temperatures this low, it becomes difficult for the system to effectively melt the snow. It is, however, possible to turn off this feature should the system be required to keep running during these low temperatures.

Can I connect any size of the snow melting mat/cable directly to the SCV-DUAL or do I need a relay panel?

The SCV-DUAL can switch loads up to and including 16 amps (resistive) at 120V or 240V. A relay is not required for jobs this size: the heaters can be wired directly to the control. For jobs above 16 amps, a relay panel is required, and the heaters would be connected to the panel/s instead of directly to the control.

What are the best home features for cold climates?

The best home features for cold climates include a simple gable roof to shed snow, covered entrances for protection, airtight triple-pane windows to prevent heat loss, and radiant heating systems. These features work together to maintain interior warmth, reduce energy bills by up to 25%, and ensure structural safety during harsh winters.

SCV-120 | Support | WarmlyYours

Support Questions

Showing 10 of 14 questions

What is the lowest temperature that a snow melt system can handle?

Our systems can handle low temperatures, but many controls come equipped with a Low-Temperature Lockout Feature. This feature prevents the system from running in very low temperatures. At very low temperatures it can become difficult for the system to effectively melt the snow. It is however possible to turn off this feature should you need the system to keep running during such low temperatures.

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Why a GFEP (GEFP, RCCB, or heat trace circuit breaker) and not a GFCI breaker for WarmlyYours outdoor deicing and snow melting systems?

GFEP is the National Electric Code (NEC) required protection for fixed outdoor deicing and snow-melting equipment, which may be accomplished by using circuit breakers equipped with ground-fault equipment protection (GFEP) of 30 mA. It is important to understand that this required equipment protection is NOT the same as a 5 mA GFCI used for personal protection.

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Will the snow refreeze into ice once melted?

All of our automatic controllers have a Hold-on time feature after the initial warming up of the snow melt system. This feature ensures that all the snow is melted from the surface, and also that the system continues to operate and evaporate the surface water without it refreezing.

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When do I need a relay panel?

When the design requirement's amp draw exceeds the selected controller's capacity.

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What in addition to the snow melt mat/cable do I need from WarmlyYours for an install?

Once you've decided what type of heating system (manual vs. automatic), you'll need to choose a control, which may or may not utilize a sensor. You may need a relay panel(s) depending on the size of the system, and a snow melt plaque which is required by the National Electric Code. Junction box(es) may be optional depending on the distance of heating cable from the indoor power location.

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Why isn't a temperature sensor required for all installations?

It depends on how the system is intended to operate. If the expectation is manual operation (ex. WiFi or Timer Control), then no sensors are required. If the expectation is automatic operation, then the system will require at least one snow sensor.

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What is GFEP?

Ground fault equipment protection (GFEP) is intended to provide protection for equipment against damaging line-to-ground currents by disconnecting all ungrounded conductors of the faulted circuit.

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Does the mat require a sensor to go with it?

No, a sensor is not required with the snow melt system. However, certain automatic controllers require a temperature/moisture sensor to sense atmospheric conditions and may also require an in-slab, high temperature limit sensor to be installed (notably, asphalt installations).

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Does the SCV-Dual/SCV-120 snow-melt controller retain its settings or reset to default values after a power outage?

The SCV-120/SCV-Dual snow-melt controller retains its setting after a power outage.

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How do I know what field I'm in on the SCV-Dual/SCV-120 snow melt controller?

Enter the configuration process (display) by holding the magnet next to the switch for 3 seconds, the green LED goes off. Remove the magnet.

The SCV will then pulse the green LED with the values of each Field in sequence, repeatedly:

Field 1 (Hold-On) will pulse once for off, twice for 1 hour, three times(default) for 3 hours, and four times for 5 hours.
Two second pause.
Field 2 (Temp) will pulse once for no temp selected, twice for 36°F/2.2°C, three times(default) for 38°F/3.3°C, and four times for 40*F/4.4°C.
Two second pause.
Field 3 (Lockout) will pulse once(defaut) for disabled and twice for enabled.
Four second pause.

Sequence starts over.

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