DIY Home Improvement Forum banner

1 - 2 of 2 Posts

·
Registered
Joined
·
1 Posts
Discussion Starter · #1 ·
I am replacing an old, circular thermostat in our church with a Totaline P374-1700. The thermostat controls only A/C, and we chose Totaline to be reset in the same way as Totaline P374-1800's which had been installed for new A/C's elswhere in the church.

The old thermostat was hooked up to 3 wires, Red, Yellow, and Green. I hooked up the same wires to the indicated terminals on the new Totaline, turned on the power, and nothing happened. The thermostat showed no sign of power or life.

I went to the previously installed P374-1800's (also for A/C only) and found that the 3 wires, and the jumpers, were identical; but the P374-1800's had an additional blue wire, connected to the "C" terminal.

Must I put in 4-wire wiring to the P374-1800, or is there a way it will work with the 3 wires already in place?
 

·
Administrator
Joined
·
41,553 Posts
Need 4 wires.
 
1 - 2 of 2 Posts
Top