Category: Quick Start Guides

M326 Series Activator – Wiring Guides

M326 Series Mounting

Control Unit must be mounted outside within close proximity of the SnowMeltz® system(s).

  • If not using a panel, power should be ran to the location of the M326A/M3262Z.
  • If using a panel, the device requires 120V/240V to operate.
  • Wiring/setup for this guide is using one (1) M326A/M3262Z, without a panel (switching up to 30 amps). For other installation situations with panels or accessories, please consult the complete user manuals for the M326A/M3262Z and other devices.
  • Mounting should be done on top of a sturdy conduit or using the mounting points on the top and bottom to secure it, ensure that nothing obstructs the top sensor from receiving moisture.
  • Installation/Setup of the activator should be done AFTER completion of installing the SnowMeltz® system and the substrate is fully cured/completed.

M326 Series Setup

These settings are the same for M326A, M326ARS, M326A2Z & M326ARS2Z series activators.

The following should be performed BEFORE installing the activator and connecting it to power.

  1. Remove the four screws on the cover.
  2. Look for the five (5) dipswitches near the center of the board.
  3. The configuration should be as follows, from top to bottom: (Figure 13.2A)
    • LD (5) to ON
    • LTC (4) to OFF
    • DEL (3) to ON
    • RAIN (2) to OFF
    • SNOW (1) to ON
  4. Locate the dials on the left side of the board.
  5. The configuration should be as follows, from top to bottom: (Figure 13.2B)
    • TRIG TEMP to 39
    • DELAY OFF to MID
    • SENSITIVITY to approximately 2 o’clock (one side should point to MORE)
  6. Replace cover and secure it with the four screws.
  7. Proceed to wiring the device for use.

The Activator has now been configured to activate the SnowMeltz® mat(s) once the temperature is below 39 AND snow (moisture) is detected. The system will also remain activated for approximately 60-90 minutes AFTER moisture is no longer detected. To change the amount of After Run time, adjust the dial
labeled “DELAY OFF” to MIN or MAX to lessen or lengthen the After Run time.

The following mounting/wiring instructions assume that a relay panel is NOT being used and power is coming from a single 240 volt circuit. For all other installation instances, please consult the complete installation manuals for the M326A and panels for other installation/wiring instructions.

M326A Series Wiring

  1. Choose a location that will receive the same snowfall as the SnowMeltz® system(s) and that will not be obstructed.
  2. Best practice is to mount the M326A on top of a weather-proof junction box to make the connections to power and the SnowMeltz® mat(s).
  3. Be sure to follow local code for the correct gauge of wire for a dual-pole 30 amp 240v circuit.
  4. Power to the M326A must be off before wiring the unit.
  5. Wire the green ground wire from the M326A to the silver ground shield from the SnowMeltz® mat and to suitable grounded wire.
  6. Take one yellow wire and the brown wire and attach them to one leg of the incoming circuit from the breaker.
  7. The other yellow wire from the M326A will be wired to one of the copper conductors on the SnowMeltz® mat.
  8. The blue wire and wire it to the other leg of the incoming power and the other copper conductor from the SnowMeltz® mat.
  9. Ensure all connections are tight and secure and close the junction box and power up the system.
  10. The light on the front of the M326A should be solid green, indicating power is being supplied to the unit.
  11. Test the system to switch the power to MANUAL using the switch on the side of the M326A, the status light should be blinking, indicating the M326A is providing power to the SnowMeltz® mat.
  12. Return the switch to AUTOMATIC, the installation is now complete.

This test is to ensure that the activator powers on correctly and there are no wiring issues. Running another test or checking settings once snowfall has occurred is advisable.

Learn About Other Activators

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M432 Activator – Wiring Guides

M432(ETO2) Activator/Controller

M432(ETO2) With Cover Removed
  • Control Unit must be mounted inside or in a water-tight enclosure if mounted outside.
  • Control Unit must be located within distance of sensor being used. Sensors can be extended using 6×14-16AWG wire up to 650 feet.
  • Wiring/setup for this guide is using one (1) M433/M430 (ETOG) sensor. For other sensor(s) or other situations, please consult the complete user manual.
  • Installation/Setup of the activator should be done AFTER completion of installing the SnowMeltz® system and the substrate is fully cured/completed.

The system must not be turned on until the concrete has fully cured.

Mounting Sensor Head (M433/M430)

The following must be follower when mounting the in-ground sensor (M433/M430):

  • Sensor must be located in the area as the SnowMeltz® system.
  • Sensor head must be flush with the top of the asphalt/concrete.
  • Space the SnowMeltz® mat slightly to accommodate the sensor head.
  • Ensure that heating element does not touch or cross the sensor head, wire, or conduit.

Wiring M432 Power and ETOG Sensor*

Figures 13.1A, 13.1B, 13.1C
  1. Remove the cover with a small-blade flat head screwdriver by pressing the two slots on the front-center of the cover.
  2. Mount the unit using the four screw holes on each corner of the unit. Be sure that the mounting location has taken into account:
    • Incoming Power
    • Proximity to sensor(s) (Extra wiring may be necessary to extend sensor)
    • Proximity to panel and/or heating element
  3. Wire sensor according to diagram in 13.1A.
  4. Wire connection to panel/heating element using the instructions from the panel and the diagram 13.1B.
  5. Wire incoming power (110V 15A) following diagram 13.1C.

Once powering on the unit, if the ALARM light blinks at any point during or after setup, check signal and sensor wiring connections.

  1. Power on the unit and do an initial setup of the software: (using the dial to move the selection up or down and pressing down on the dial to make the selection/ENTER)
    • Choose Celsius or Fahrenheit (ENTER)
    • Select ETOG (ENTER)*
    • Leave “Sensor 2” on the OFF setting (ENTER)
    • Leave the “Outdoor Sensor” OFF (ENTER)
    • Select “Electric 1-Zone” under APPLICATION (ENTER)
    • On this screen, hit (ENTER) to enter the menu, then scroll down to “Setup”
    • On the setup menu, scroll down to “Afterrun 1” and hit (ENTER)
    • Default for After run is 2 hours, it is advised to adjust this to a longer time period (3-4 hours) and then dial back from there based on the performance of the system. Once complete, hit (ENTER).
    • Scroll down to “Exit” and hit (ENTER), the initial setup is complete.
  2. Run an test run of the system to see if everything is working properly.
    • To run a test of the system hit (ENTER), scroll down to the “Setup” screen and then select “Force Heat,” hit (ENTER). The internal relay should click on and the panel(s) should activate as well. After both the panel and activator have powered on, with “force Heat” still selected, hit (ENTER) again to deactivate the activator.
  • Initial testing in this phase is to check to see if the activator/panel powers on and there are no wiring issues. It is advised to run another activator/panel test or checking settings once snowfall has occurred.
  • It is NOT recommended to change the default activation temperature, which should be 37°-38° F
  1. After testing is completed. The system can be powered off during the non-winter months, but being sure to completely power on the activator and panel(s) before the first snow and leave powered on for the entire season.
  2. Make any adjustments necessary to activator as required for optimal efficiency for the given

*ETOG is the in-ground sensor, if using additional/different sensors please consult the M432 (ET02) manual for wiring diagrams for these sensors.

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