"There should be a 24vac transformer somewhere." Although interestingly, this brings us onto our next topic. Henry, the cables in the upper left "the blue, red and earth" don't touch them! These are LIVE wires, electricity can kill. I also have some pictures to add Henry's collection. I'm new here, so I'll just credit everyone at the bottom.
Secondly, let me address the comments section.
It also uses 2 AAA alkaline batteries as a backup, or to supplement if your system can't deliver enough power." Meaning you could use your two wires across R(RH) & W(W1), pop in a battery, and have a beer. Simple Answer: They're both right! Google: "The Nest Thermostat receives power from your HVAC system. "I've searched around and asked for advice and I've heard some people say it will work with just 2, and some say I need a C-Wire." I realize this is an old thread but I'll share my insight. I too own a similar VULCAN ducted heater, and was thinking about fitting a nest (or ecobee) thermostat, here in Australia. If it makes a difference, this is in Australia. The heat I have is a Vulcan Tubular Central Heater – V3 20i Internal NG : Part #5310052 If this is not possible, can I/ do I need to connect directly to the board? It also looks like there is a piece of wire connecting the 24v connector to the 2nd heat port, what is this for and do I need to keep it there? Now my question is, is the single 24v terminal used for the C wire? And if so, what would the 2x black wires be named when connecting to the Nest Thermostat? Given the opportunity, I think it best to run a C-wire if possible, I have uploaded images of the Heater unit and it seems as though the 2 wires from the thermostat connect to the (green) 2 x "Heat" terminals and I assume the 2 x "Cool" terminals are for Air con if I had it. I've searched around and asked for advice and I've heard some people say it will work with just 2, and some say I need a C-Wire. I'm looking to purchase a Nest Thermostat-E but my current thermostat (Vulcan/Bonaire Summer Breeze) only has 2 black wires connected. If it makes a difference, this is in Australia.I'm hoping the friendly people here could help me. Given the opportunity, I think it best to run a C-wire if possible, I have uploaded images of the Heater unit and it seems as though the 2 wires from the thermostat connect to the (green) 2 x “Heat” terminals and I assume the 2 x “Cool” terminals are for Air con if I had it. I’ve searched around and asked for advice and I’ve heard some people say it will work with just 2, and some say I need a C-Wire. I’m looking to purchase a Nest Thermostat-E but my current thermostat (Vulcan/Bonaire Summer Breeze) only has 2 black wires connected. I’m hoping the friendly people here could help me.
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