Replacing A1-66 line voltage thermostat with new A1-66

[Stardust Dave]

In my G'ma unit in a 54 year old house the thermostat gave out after all those years.

Ordered a A1-66 and it has leads extending from a sealed rear of unit.
Two black leads and two blue leads.

The old thermostat had screws on terminals , top screws are marked "line".
Bottom wires are marked "load". They happen to have two extra wires tucked into the bottom screws, I would guess the wires go on to power another outlet.

I dont know where to hook the black wires to or the blue wires.
Hope the pics help.

 

[Don Farrell]

Judging by the condition of the conductors in the box (Image 1-15-19 @4:52 PM.jpg) You need to call a licensed electrician to look at the conductors. There appear to be serious burn marks and pits in the conductors. You are basically looing at a serious fire hazard,