Month: June 2022

June 22, 2022

Product Selection – Complete Kits

Product Selection

Since SnowMeltz CANNOT be shortened, it is vital to choose the correct size system before installing. It is advisable to always get a smaller system for the area, for example: if the area is 48 square feet, choose a 40 or 45 square foot system.

SnowMeltz® Mat Kits – 37 Watts/Ft2 @240VAC

Standard SnowMeltz kits include the SnowMeltz mat(s), an automatic activator, and jumpers. These kits are designed to use a single 20, 30 or 40 amp, 240 volt GFI breaker.

Heatizon Part NumberCircuit
Size		Coverage
Area/Square
Foot		Mat(s)
Dimensions
SM-50W277-37W240-1020102’x5′
SM-50W277-37W240-1520152’x8′
SM-50W277-37W240-2020202’x10′
SM-50W277-37W240-2520252’x13′
SM-50W277-37W240-3520352’x17′
SM-50W277-37W240-4020402’x20′
SM-50W277-37W240-4520452’x23′
SM-50W277-37W240-5020502’x25′
SM-50W277-37W240-6020602’x30′
SM-50W277-37W240-7520752’x37′
SM-50W277-37W240-8520852’x43′
SM-50W277-37W240-100201002’x50′
SM-50W277-37W240-110*301102’x25′; 2’x30′
SM-50W277-37W240-120*301202’x30′; 2’x30′
SM-50W277-37W240-130301302’x65′
SM-50W277-37W240-135*301352’x30′; 2’x37′
SM-50W277-37W240-145*301452’x30′; 2’x43′
SM-50W277-37W240-150*301502’x37′; 2’x37′
SM-50W277-37W240-160*401602’x37′; 2’x43′
SM-50W277-37W240-170*401702’x43′; 2’x43′
SM-50W277-37W240-185*401852’x43′; 2’x50′

* These kits contain two or more SnowMeltz mats to reach the stated square footage.

SnowMeltz® Large Mat Kits – 37 Watts/Ft2 @240VAC

Large SnowMeltz kits include the SnowMeltz mat(s), a dual-circuit automatic activator, and jumpers. These kits are designed to use two 20, 30 or 40 amp, 240 volt GFI breakers.

Heatizon Part NumberCircuit
Size		Coverage
Area/Square
Foot		Mat(s)
Dimensions
SM-50W277-37W240-2002×20200(2)-2’x50′
SM-50W277-37W240-2202×30220(2)-2’x25′; (2)-2’x30′
SM-50W277-37W240-2402×30240(4)-2’x30′
SM-50W277-37W240-2702×30270(2)-2’x30′; (2)-2×37′
SM-50W277-37W240-2902×30290(2)-2’x30′; (2)-2’x43′
SM-50W277-37W240-3002×30300(4)-2’x37′
SM-50W277-37W240-3202×40320(2)-2’x37′; (2)-2’x43′
SM-50W277-37W240-3402×40340(4)-2’x43′
SM-50W277-37W240-3702×40370(2)-2’x43′; (2)-2×50′
SM-50W277-37W240-3802×40380(2)-2’x30′; (2)-2×65′

SnowMeltz® Jumbo Mat Kits – 37 Watts/Ft2 @240VAC

Jumbo SnowMeltz kits include the SnowMeltz mat(s), an automatic activator, contactor panel, and jumpers. These kits are designed to use two, three or four 40/50 amp, 240 volt GFI breakers.

Heatizon Part NumberCircuit
Size		Coverage
Area/Square
Foot		Mat(s)
Dimensions
SM-50W277-37W240-4102×40410(2)-2’x37′; (2)-2×65′
SM-50W277-37W240-6153×40615(3)-2’x37′; (3)-2×65′
SM-50W277-37W240-8204×40820(4)-2’x30′; (4)-2’x65′
SM-50W277-37W240-10404×501040(8)-2’x30′
Installation

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June 20, 2022

Install Contactor/Relay Panel

Electrical Connections

The M330/M530 panel must be located inside, unless a custom outdoor-rated enclosure is used. The
location should be free from moisture and reasonably close access to heated area and main
circuit panel for making electrical connections.

When installing multiple SnowMeltz and the total amp load is over 30 amps, a panel will be
required. Heatizon has several options to meet this need:

  • M530 Series – Contactor panel, perfect for low-budget applications, handles up to 4 circuits, and up to 50 amps per circuit, no GFEP.
  • M330 Series – Relay panel without GFEP, handles up to 4 circuits, and up to 30 amps per circuit.
  • M330-50 Series – Relay panel without GFEP, handles up to 4 circuits, and up to 50 amps per circuit.
  • M330G Series – Relay panel with GFEP, handles up to 4 circuits, and up to 30 amps per circuit.
  • M330G-40 Series – Relay panel with GFEP, handles up to 4 circuits, and up to 40 amps per circuit.
  • Custom Panels created to project specifications.

For wiring the panel for your project consult the wiring diagram for that specific panel. Some panels may
or may not require 120V for direct power.

For M530 series contactor panels:

Notes:

  • Connections to the M326 series activators, CANNOT be made inside the device, they MUST be made in a outdoor-rated junction box mounted below the device. Failure to do so will void the warranty and damage the unit.
  • SnowMeltz cold leads are 20 feet long, in the event that the cold lead(s) are not long enough, they must be extended using an appropriate gauge wire for the load/voltage and the appropriate junction box dependent on the location of the box. Please follow local codes for type/gauge of wire and type/rating of junction box to be used.
  • Use the appropriate number and size of breakers for the project, do not overload circuit breakers, or contactors in a panel.
  • Contactors have a maximum capacity of 50 full load amps, do not exceed this rating.

For M330 series relay panels:

  • Connections to the M326 series activators, CANNOT be made inside the device, they MUST be made in a outdoor-rated junction box mounted below the device. Failure to do so will void the warranty and damage the unit.
  • SnowMeltz cold leads are 20 feet long, in the event that the cold lead(s) are not long enough, they must be extended using an appropriate gauge wire for the load/voltage and the appropriate junction box dependent on the location of the box. Please follow local codes for type/gauge of wire and type/rating of junction box to be used.
  • Use the appropriate number and size of breakers for the project, do not overload circuit breakers or relays in a panel.
  • Consult the instructions for the specific relay panel purchased for it’s full load specifications. DO NOT exceed this full load rating.
  • Do not alter, tamper with, or change the factory wiring of any M330 Series relay panel, as this will void the warranty and can cause damage to the panel, connected heating systems, and circuit breakers.
Forms
Electrical Connections
M326A Activator
M326ARS/-2Z Activator
Other Activators

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June 20, 2022

M326ARS-2Z Activation Device

Electrical Connections

The M326ARS/M326ARS-2Z is an automatic temperature and moisture sensor that switches up to 30 amps (M326ARS) and up to two 30 amp loads (M326ARS-2Z). Both have a remote moisture sensor that can be located in a location up to 10 feet away from the main unit, providing for better moisture gathering placement.

For wiring the M326ARS, please refer to the primary SnowMeltz Manual wiring diagram for the M326A as wiring for both units is the same.

Wiring the M326ARS-2Z using two circuits is as follows:

Important: DO NOT OVERLOAD CIRCUITS Connect SnowMeltz mats in proper way to ensure adequate load balancing.

M326ARS/M326ARS-2Z Location

The M326ARS/M326ARS-2Z must be located outside for accurate temperature/moisture reading. The main unit can be mounted on an exterior wall or to a post, provided that all necessary electrical connections can be made. The moisture sensor should be located in such a way that it receives the same
exposure to falling moisture as the area being controlled. The sensor head can be located up to 10 feet
away from the main M326ARS/M326ARS-2Z unit.

From the pictures, you can see the main unit and remote sensor are mounted in separate locations
in order to maximize moisture detection.

Forms
Panel Installation

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June 20, 2022

SnowMeltz® Expanded Layouts

Installation

Laying out SnowMeltz using multiple mats follow the following rules:

  • SnowMeltz CANNOT overlap any other SnowMeltz cold lead, heating element.
  • Maintain at least 3 inch spacing between mats and cold leads.
  • Spacing mats greater than 5 inches may cause striping (areas of delayed snow/ice melting).
  • Mark all control joint locations before doing layout.
  • Find appropriate location(s) for contactor* and/or activator.
  • Mark tentative location(s) for junction box(es) and activator.
  • Layout mats BEFORE applying the substrate. Do not install them at the same time.
  • Plan layouts with any/all joints in mind in order to minimize crossing those joints.
  • Follow ALL instructions outlined in the primary SnowMeltz instruction manual for installing SnowMeltz mats.

Here are a couple example layouts with the large and jumbo SnowMeltz kits:

Using the SnowMeltz 290 kit (SM-50W277-37W240-290) to fill a space that is approximately 330 square feet, with 3 inch spacing around the perimeter and between mats. This example has no control joints, therefore no jumpers would be used. All the cold leads would meet the incoming power at the activator device (M326ARS-2Z), where all the electrical connections would be made.

Using the SnowMeltz 820 kit (SM-50W277-37W240-820) to fill a space that is approximately 950 square feet, with 4 inch spacing around the perimeter and between mats. This example has control joints about every 10-11 feet. The mats have been laid out to minimize the number of jumpers required. As you can see, the mats are arranged similarly in four quadrants. See the diagram below for mat routing in each quadrant.

This example would require feeders to each side to junction boxes on either size of the space. These feeder lines should be based on National Electric Code and local codes to carry the appropriate amp load and number of circuits. Any/all junction boxes used should be outdoor-rated.

This example uses 1-130 square foot mat and 1-75 square foot mat in each quadrant, with the 130 square foot mat being the one that crosses the horizontal control joint. This is the point where a jumper would be used to protect the SnowMeltz cable from any potential cracking/physical damage. No vertical control joints are needed to be crossed in this example. Be sure to read and follow all installation instructions regarding joints in the primary SnowMeltz manual (SEE: “A Few Concrete Suggestions”).

Required Tests

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June 20, 2022

Circuit Design – Expanded Kits

Electrical Connections

SnowMeltz Expanded System Circuit Design

In order to ensure proper load balancing on circuits, the SnowMeltz expanded kits have been designed to use combinations of mats on specific circuits:

SnowMeltz® Large Mat Kits

Heatizon Part Number Circuit
Number/
Amperage		 Mats Amps Per
Mat @ 240V		 Amps Per
Circuit @ 240V		 Mat(s) Square Footage Mat
Dimensions
SM-50W277-37W240-200 1 – 20A SM-50W277-37W240-100 15 15 100 2’x50′
2 – 20A SM-50W277-37W240-100 15 15 100 2’x50′
SM-50W277-37W240-220 1- 30A SM-50W277-37W240-50 7.7 17 50 2’x25′
SM-50W277-37W240-60 9.3 60 2’x30′
2 – 30A SM-50W277-37W240-50 7.7 17 50 2’x25′
SM-50W277-37W240-60 9.3 60 2’x30′
SM-50W277-37W240-240 1- 30A SM-50W277-37W240-60(x2) 9.3 19 60 2’x30′
2- 30A SM-50W277-37W240-60(x2) 9.3 19 60 2’x30′
SM-50W277-37W240-270 1- 30A SM-50W277-37W240-60 9.3 21 60 2’x30′
SM-50W277-37W240-75 11.6 75 2’x37′
2- 30A SM-50W277-37W240-60 9.3 21 60 2’x30′
SM-50W277-37W240-75 11.6 75 2’x37′
SM-50W277-37W240-290 1 – 30A SM-50W277-37W240-60 9.3 22 60 2’x30′
  SM-50W277-37W240-85 13.1 85 2’x43′
2 – 30A SM-50W277-37W240-60 9.3 22 60 2’x30′
  SM-50W277-37W240-85 13.1 85 2’x43′
SM-50W277-37W240-300 1 – 30A SM-50W277-37W240-75(x2) 11.6 23 75 2’x37′
2 – 30A SM-50W277-37W240-75(x2) 11.6 23 75 2’x37′
SM-50W277-37W240-320 1 – 40A SM-50W277-37W240-75 11.6 25 75 2’x43′
SM-50W277-37W240-85 13.1 85 2’x50′
2 – 40A SM-50W277-37W240-75 11.6 25 75 2’x43′
SM-50W277-37W240-85 13.1 85 2’x50′
SM-50W277-37W240-340 1 – 40A SM-50W277-37W240-85(x2) 13.1 26 85 2’x43′
2 – 40A SM-50W277-37W240-85(x2) 13.1 26 85 2’x43′
SM-50W277-37W240-370 1 – 40A SM-50W277-37W240-85 13.1 29 85 2’x43′
SM-50W277-37W240-100 15.4 100 2’x50′
2 – 40A SM-50W277-37W240-85 13.1 29 85 2’x43′
SM-50W277-37W240-100 15.4 100 2’x50′
SM-50W277-37W240-380 1 – 40A SM-50W277-37W240-60 9.3 30 60 2’x30′
SM-50W277-37W240-130 20 130 2’x65′
2 – 40A SM-50W277-37W240-60 9.3 30 60 2’x30′
SM-50W277-37W240-130 20 130 2’x65′

SnowMeltz® Jumbo Mat Kits

Heatizon Part Number Circuit
Number/
Amperage		 Mats Amps Per
Mat @ 240V		 Amps Per
Circuit @ 240V		 Mat(s) Square Footage Mat
Dimensions
SM-50W277-37W240-410 1 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
2 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
SM-50W277-37W240-615 1- 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
2- 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
3- 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
SM-50W277-37W240-820 1 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
2 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
3 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
4 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
SM-50W277-37W240-1040 1 – 50A SM-50W277-37W240-130 20 40 75 2’x65′
SM-50W277-37W240-130 20 130 2’x65′
2 – 50A SM-50W277-37W240-130 20 40 85 2’x65′
SM-50W277-37W240-130 20 100 2’x65′
3 – 50A SM-50W277-37W240-130 20 40 60 2’x65′
SM-50W277-37W240-130 20 130 2’x65′
4 – 50A SM-50W277-37W240-130 20 40 60 2’x65′
SM-50W277-37W240-130 20 130 2’x65′

Important: DO NOT OVERLOAD CIRCUITS!
Follow the load balancing chart to ensure the appropriate loads are on specific
circuits. It is also important to use properly sized breakers to be able to achieve the
desired amount of power required.

When installing SnowMeltz multiple mat systems, be sure to keep track of which mat is going to
the appropriate circuit. Mark the cold leads and/or note resistance to keep track.

The use of junction boxes may be required to extend cold leads back to either the activation
device or to the contactor panel. Extending/junctioning cold leads MUST be done in accordance
with the National Electric Code and any/all local codes. Be sure to note the amps per mat/circuit
in order to determine the appropirate conductor and junction box to use. Any junction box used
outside MUST be outdoor-rated.

Do not make ANY connections inside of the following activators:

  • M326A/2Z
  • M326ARS/2Z

All electrical connections for these devices MUST take place outside of the device, in a
outdoor-rated junction box with adequate space for all connections

Electrical Connections

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