Replacing a mercury 2 wire thermostat to nest g4cvz

[macksportsman]

I purchased a nest g4cvz to install and replace my Mercury 2 wire thermostat. The 2 wire operates as a circuit with open= off and closed = On. I installed a transformer that is labeled R and C. 

I cannot seem to get the wiring down. Anyone have this issue? 

[Patrick_Caezza · Accepted solution]

@macksportsman 

To use the Google Nest Thermostat (2020) with your system you need the Nest Power Connector and an external 24vac transformer.

Wiring would be like this,

[macksportsman]

I try this every way and cannot get it. 

I installed a 24v transformer that has 2 terminals. One labeled R which I have the red wire connected.

Other is labeled C which I have the white wire on

My fireplace has the blue and green wires to control it. 

Any experience would be very helpful