SCV-DUAL Frequently Asked Questions

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Frequently Asked Questions

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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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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 under 16 amps in 120V and in 240V. A relay is not required for jobs this size. In jobs using less than 16 amps, the heaters can be wired directly to the control. For jobs over 16 amps, a relay panel is required, and the heaters would be connected to the panel/s instead of directly to the control.

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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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When do I need a relay panel?

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

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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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