[JPD]

Hello

I bought a Noma Programmable Therm. Model 52-2549-0 and installed it in the winter.

The Furnace worked fine, but now I tried the AC and no go.

I have 4 wires. 1 set in a Green Insulation around a Red and Black wires and the other 2 wires are white and black.

Here is how it is plugged into the noma thermostat

G - Red Wire - Green Insulation one
Y - Black Wire - Green insulation one
Rc/Rh - Black Wire (jumpered)
W/ B/O - White


Any ideas?

Thank you

[hvacservicetech_07]

Do you have any idea where these wires were on the old thermostat? What model is the furnace?

[letmetellu]

Look at the terminal board in the furnace and determine where the wires from the thermostat go to on th terminal board.
The R terminal should match up with the Rh on the thermostat.
The W terminal should match up with the W on the thermostat.
The G terminal should match up with the G on the thermostat
The Y terminal should match up with the Y on the thermostat.

Also on the Y terminal at the furnace you should have a wire from the compressor.
Also on the C terminal at the furnace you should have a second wire from the compressor.

You can use a OHM meter to find out which wires are which.