Trying to update old Honeywell thermostat; Want to install newer Huner version.?

Question

I am updating a Honeywell Q674L thermostat to a Hunter 44428. The problem is the old unit had an "L" wire connection (it was a brown wire). Searching online, it seems to be the L is a systems monitoring (huh?) line, but I still don't know where to connect it. The new t-stat has R, Y1, W1, W2, G, O/B, E, A, and C terminals.

Also, the old unit had a jumper line between E and Y. Do I do that with the new one as well? And finally, the old unit had a W2 connection, but no W1 connection. Do I keep it this way on the new T-stat? Thanks!!

Answer 1

Ok, old stat looks like this? Green-G, Blue-B, Brown-C, Red-R, Yellow-Y1 and White jumperd between W1 and E. That is how is should have looked. If so new one should look like this.
Red-R, Yellow-Y1, White jumpered between W1 and W2, Green-G, Blue-B and Brown-C. You better have a Heat Pump system or you need to take that stat back and get another one. I don't know why there was a jumper between E and Y on the old one it should have been E and W2. Why don't you take a picture of both of the stats hopefully the old one is still on the wall. Send them to me I will better know how to walk you through it. Good luck.

Answer 2

You may have to call heating/ac people. I had these problems when changing brands and the fourth company finally figured it out. Good luck.