How many expansion boxes can be connected to a single HMB?

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• Can you connect multiple expansion boxes?

  No. You can connect a maximum of one. It can be either an EXPANSION-6 or an EXPANSION-14. Module outputs can be connected to expansion boxes to expand their load capacity though. For example: An FD-1-14 or FD-2-7 FanDrive connected to a VDC-4 output, ...

• Does the HMB need to be connected to the same phase of power as the heat mat in a 3-phase power system?

  Yes. The HMB, heat mat, and any expansion boxes/mats all need to be connected to the same phase of power.

• What mats is the HMB compatible with?

  The HMB is compatible with Hog Hearth® heat mats, as well as many other mats on the market today. It can be configured to work with mats that use 1k, 3k, or 5k sensors.

• Why is my main control working but my expansion box is not?

  Confirm the expansion box wiring going from the master to the expansion. The Heat Mat Box has a connector labeled SLAVE 1 for connecting Expansion Boxes. Connect the Expansion Cable from SLAVE 1A to SLAVE 1B. To connect additional Expansion Boxes, ...

• Why am I getting different outputs on my main box and expansion box?

  Ensure that your main box, expansion box, and applicable mats are all connected to the same phase of power.