Not really a repair but an upgrade. I want to replace the existing
Honeywell LR1620 thermostat on my heating/AC system, one transformer, to one
of those new electronic automatic setback ones.
The old thermostat has connections lettered R,G, Y and W with appropriately
colored wires going to them (red to R,etc)
The new one has terminals also lettered G,Y, W and an RH and RC. It came
with the RH and RC already jumpered together. Is it just a matter of
transferring the wire on the same letter terminal from the old one to the
new one,or is there some catch?