sbayliff
Jun 1, 2008, 12:25 PM
The old thermostat is a Lennox t-90 mercury thermostat. It has 4 wires with an ac unit and a heating unit. There are no heat pumps on the system.
The old t-stat Lennox T-90 has 5 terminals labeled G,F,C,H,and V. It has a jumper wire between the G and F.
new thermostat is a Honeywell RTH230b. It has Rc, Rh, (with jumper), W, Y, and G terminals. The instructions do not list the terminals on my old t-stat.
Questions are With the old terminal designations, where do they match on the new terminal designation?
I have done this before, but not replacing such an old t-stat (circa 1968). Not sure which wires go where.
The old t-stat Lennox T-90 has 5 terminals labeled G,F,C,H,and V. It has a jumper wire between the G and F.
new thermostat is a Honeywell RTH230b. It has Rc, Rh, (with jumper), W, Y, and G terminals. The instructions do not list the terminals on my old t-stat.
Questions are With the old terminal designations, where do they match on the new terminal designation?
I have done this before, but not replacing such an old t-stat (circa 1968). Not sure which wires go where.