How to wire a WarmlyYours SCP-120 Snow Melting Controller


When you’re ready to give up the shovel and salt and enjoy a driveway that’s always safe to walk on and conveniently clean, WarmlyYours will provide the comfort with driveway heating systems for ice and snow. We are proud to offer premium controls for our snow melting systems, allowing the user to customize the temperature of the radiant system for energy efficiency.

This control system comes with several advanced features including an aerial-mounted sensor, a hold-timer for extended heating, and an optional unit to control the system remotely. The premium control has an adjustable dial on the front cover which provides the option of setting the slab temperature up to 90°F. This feature limits how hot the slab will get, and is particularly beneficial when using the WHCA or WHMA constant watt snow melting cables and mats in asphalt driveways.

The control works in conjunction with a slab temperature sensor and an aerial mounted snow sensor (AIR-SS). The SCP-120 panel has a hold-on timer for user adjustment allowing the user to keep the system on for up to 10 additional hours, after snowfall has stopped. An optional RCO unit may be added to manually override the control panel from a remote location. This control option is ideally suited for pavers.

Video Transcript

Hello, I'm Scott from WarmlyYours, and today we're going to talk about our low voltage connections between our SCP-120 and our aerial sensor and slab sensor. We'll be going over the low voltage connections to show you where to put them to get your system working correctly. Here we can see our controller and down here we have our in-slab sensor, which tells the controller what the temperature of the slab is at all times, and also our aerial sensor, which senses the temperature of the air and also if it's snowing or not. To make our connections in this controller, you'll need to open up the front and then if you look here, you can see we've already taken the screws out, but there are some screws here that will need to be removed. And also at that point, you need to pop the plastic pop rivet that's there on the front that will allow you to remove your front cover. Take a look up here. Here's where our connections will take place. We've taken the metal bracket out of the box to make it easier to see your connections. But the connections we're going to be making are right along here. And you can see each one is numbered. So we'll be putting the corresponding sensor into its corresponding screw. What we're going to be concentrating on this is screw number one, two and three, and then also screw number 10 and 11, because those are the connections we're going to be making for the aerial snow center and for the in-slab temperature sensor.

Now we can take a look at the wiring terminal strip, and if you look here, we've got terminals 1, 2 and 3 and terminals at 10 and 11. If you look, these wires need to be in this order. It needs to be white. And number one, it needs to be black in number two, and it needs to be red in number three. If we take a look over here, it does not matter which color goes where. So black can go in 10 or red can go 110 or vice versa. That's not important. It just needs to have a good connection between 10 and 11. If you look at the connection here, you can see where there's not a lot of extra wire hanging out that way. There's no chance of getting a short, if the wires do happening across the inside here. It is kind of tight in here to wire. So you want to make sure that you don't have a lot of spare wire that is sticking out. You want the insulation to be pretty close to this. These are simple screw down connections. So you'll need a small screwdriver like this one and the screw is screwed here from this direction. So if you have a small screwdriver, jeweler's screwdriver or something like that, you should be set. So that's how easy it is to make your low voltage sensor connections with the SCP-120. If you have any other further questions, feel free to contact us at

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