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It does not appear to be one of the two obvious choices - one side common or button down connects terminals across from each other.

Used on an HVAC unit.

It is busted so I can not probe it out.

Any ideas?

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    \$\begingroup\$ What was on the labels next to each button? \$\endgroup\$ – stark Jan 7 at 20:44
  • \$\begingroup\$ @stark Updated OP with photo of the faceplate. Thanks! \$\endgroup\$ – bigjosh Jan 7 at 21:04
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    \$\begingroup\$ PTAC controls should go to Heater (Heat), Compressor (Cool), High speed fan (High), Low speed fan (Low) or neither (Auto/Standby). You might be able to get a diagram based on the Manufacturer and Model. \$\endgroup\$ – stark Jan 7 at 23:07
  • \$\begingroup\$ that is a custom made device .... the interconnection depends on the manufacturer's requirement ...... the pictures are not useful for anything other than showing what you are talking about \$\endgroup\$ – jsotola Jan 8 at 0:48
  • \$\begingroup\$ look for a wiring diagram sheet inside the hvac device \$\endgroup\$ – jsotola Jan 8 at 0:51

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