Help with wiring mercury switch

[milleda31]

I have a Comfortec CDV36RP gas fireplace on which I recently replaced the gas valve. The gas valve is a Robertshaw as shown in the attached picture. The fireplace also has a mercury switch which is similar to the one shown in the attached picture.

My situation that requires assistance is regarding the two wires that come off the mercury switch. In my haste to replace the gas valve, I didn't pay close attention to the connection of the two wires from the terminals of the mercury switch. I have everything else wired back up.

I'm pretty sure one attaches to the top terminal. Where does the other connect? Middle or bottom terminal?

Thank you in advance.

 

[DAKSY]

Any switch connected to a millivolt type has valve should be connected to the TH & TH-TP labelled terminals. TH = THermostat (which is a switch). TP = ThermoPile.

 

[milleda31]

Thank you.

Does it need to be stranded wire or will solid copper work?

 

[DAKSY]

Either will work

 

[wildman21]

I have a Comfortec CDV36RP gas fireplace on which I recently replaced the gas valve. The gas valve is a Robertshaw as shown in the attached picture. The fireplace also has a mercury switch which is similar to the one shown in the attached picture.

My situation that requires assistance is regarding the two wires that come off the mercury switch. In my haste to replace the gas valve, I didn't pay close attention to the connection of the two wires from the terminals of the mercury switch. I have everything else wired back up.

I'm pretty sure one attaches to the top terminal. Where does the other connect? Middle or bottom terminal?

Thank you in advance.

View attachment 285472View attachment 285473View attachment 285474

When you installed the new replacement Robertshaw Valve (I assume it was model SRV7529109) did the Mercury flame switch then become obsolete? Did you end up leaving those wires off? Did the existing thermopile still work with the new valve or did you end up replacing that too?