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124sport 08-28-2011 06:06 PM

Removing old lennox thermostat
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I bought a digital thermostat but am stumped as to how to remove the old lennox stat. Only numbers are inside: 9549 E8. There are no screws visible and if I pry from behind, or in between the base layers, I feel like I'll break it. Thanks.

fabrk8r 08-28-2011 06:11 PM

Remove the 3 small straight slot screws and the thermostat will come off the sub-base.

Doc Holliday 08-28-2011 06:51 PM

Turn the breaker to the furnace off before removing any wires. Whichever wire is on RH or RC terminal will be hot, 24 volts. If that wire touches anything while live you stand the chance of blowing the fuse on furnace board. Just a minor inconvenience but still more work than neccassary if it blows.

Under those three screws there'll be two more holding that base to the wall.

124sport 08-28-2011 09:54 PM

Thanks. I looked at those but the have contacts mounted through them so figured that wasn't it. But, will try tomorrow with breaker off of course.

124sport 08-29-2011 06:29 PM

Done. Thanks.

fabrk8r 08-29-2011 06:37 PM

You're welcome!

Thank you for letting us know how things worked out for you. :)

I hope the new thermostat is everything you hoped it would be.

124sport 09-03-2011 12:16 PM

Actually, I think I'm gonna put on the old mercury based lennox. This thing (honeywell) stinks. It seems like it runs the ac forever. I guess cause its trying to get the temp down a full degree below the setting or something. Anyhow...we never felt so cold or so hot with the old thermostat. Thought this would be better for a newborn.

hvactech126 09-03-2011 05:10 PM

it maybe a setting in the stat or it is a cheapo stat. post the model number. You should not get wild temperature swings with a digital stat.

beenthere 09-03-2011 05:21 PM


Originally Posted by 124sport (Post 720463)
Thought this would be better for a newborn.

Newborns/babies/infants. Are not uncomfortable at the same temps as adults are.

Post the model number of the new thermostat you have.

124sport 09-03-2011 07:36 PM

RTH2310 Programmable Thermostat. It was $50 at Walmart but with a $25 rebate so I guess it is a cheapo. Doesn't look like there is any adjustment/setting for this (ie- change when it turns on or turns off in relation to thd temperature setting. For example, if I set it at 72, it seems to want to take the room temp to 71 before shutting off. likewise it seems like it won't turn on until it gets to 74. I'd rather it shut off at 72, and turn on at 73).

hvactech126 09-03-2011 08:03 PM

so, yes, that is not a good stat IMO. I would recommend pro series Honeywell stats.

beenthere 09-03-2011 08:04 PM

50 dollar tstats are cheapo's.

Move up to a 7500 series, it will have a tighter temp tolerance.

124sport 09-03-2011 08:59 PM

So am I looking for something with a "high/low" setting or "setpoint/desired temp" setting? (I saw those phrases in the specs on some of the higher end honeywells I googled). I want the ability to tell it when to kick on and off in relation to the temp I set zbd just need to know the proper "lingo" to look for. Thanks a lot guys. I'll bd taking this off soon.

beenthere 09-03-2011 09:06 PM

Honeywell doesn't allowed you to set a differential. Some of the Luxpro does though.

124sport 09-04-2011 10:25 AM

This looks like the only one I can find that allows this (in terms if what's readily available at home improvement stores)

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