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Lennox - Model Number differences?

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FargoGuy

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Discussion starter · #1 ·
Hi, I'm trying to understand the difference between the following model numbers for a Lennox 2 stage heater

el280uh090xe48b vs el280uh090xp48b

I found a site that points out the highlighted letter is for info about the blower. P = PSC Multi-Speed Blower Motor. What does "e" mean?

Thanks!
 
Discussion starter · #3 ·
Thanks.

In a bid I received for a 2 stage furnace they have these as 2 of the bullet points
-Two-stage operation
-Two speed blower motor

Would both of these models fit this criteria for the blower motor? "P" seems to indicate different speeds. Does "E" - electronically commutated motor also mean two speed blower motor?
 
#8 ·
https://www.lennoxpros.com/docs/Technical/210631.pdf

Page one “ Model number Identification “

XP the X says low nox and P having a PSC motor. BTW manufacturers stopped production of furnaces with PSC motors I believe in July 3 2019

Nothing wrong with a furnace with the PSC motor IMO, it’s just that manufacturers are concentrating on the more energy efficient ECM blower motors, such as the constant torque or variable speed.

https://www.google.com/url?sa=t&rct...DRAC&url=https://learnlennox.com/fer-is-ready/&usg=AOvVaw2E0YHx8-Qs6Fl9RKGcAZT6
 
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Discussion starter · #9 ·
Thanks.

Reason I ask is that we just had a el280uh090xe48b installed. Today was our first morning using it. I woke up this morning with house at 61 at 5:30am, and that's when heat is set to kick on. At 6:30 is had only risen to 62, by 7:30 it was at 64. It felt like little to no air was blowing our, even though thermostat said stage 2 heating. Is this just how 2 stage furnaces work and I have to turn on real early to get house up to temp? Our old one stage furnace could get house from 60-70 in 30-45 minutes and you could feel the hot air blowing.
 
#10 ·
Believe 1st stage heat runs the blower on a lower speed, when 2nd stage energizes, ( if thermostat calls for 2nd stage ) the blower speed increases. Maybe they never set up your blower speed correctly? Not sure how this model works as if it’s a true two stage furnace where the thermostat controls the stages, or some brand models use time to energize the 2nd stage, those types you can use a one stage thermostat. Myself I’m not familiar with Lennox , sequence of operation on that particular model.

Chances your old one was a single stage and brought all the heat on at once. Did they replace like for like BTU ratings, or actually did a load calculation to see what you really needed, and installed a slightly smaller BTU furnace?
 
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#11 ·
FargoGuy said:
Thanks.

Reason I ask is that we just had a el280uh090xe48b installed. Today was our first morning using it. I woke up this morning with house at 61 at 5:30am, and that's when heat is set to kick on. At 6:30 is had only risen to 62, by 7:30 it was at 64. It felt like little to no air was blowing our, even though thermostat said stage 2 heating.
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Sounds like a possible setup issue. Did the contractor install a new thermostat with this system, or are you using an old thermostat?

Either way, I would get on the phone with them and have them come back out to verify all settings. It is too hard to diagnosis situations like this without being there to review the installation.
 
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Discussion starter · #12 ·
Thanks for the help/thoughts.

They did figure out the BTU requirements and replaced with a different size, 90k BTU for a 2400 sq ft single level home in temperate climate (rarely below 40). We kept our next thermostat, they had to run one extra wire for 2nd stage. It just seems like it's stuck in the low blower setting and from sound of things, is worth a call to have the installer come back out to check settings. Appreciate the input. Figured I would start here to gain some insights before making the call.
 
#13 ·
FargoGuy said:
We kept our next thermostat, they had to run one extra wire for 2nd stage. It just seems like it's stuck in the low blower setting and from sound of things, is worth a call to have the installer come back out to check settings. Appreciate the input. Figured I would start here to gain some insights before making the call.
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If next is a typo for NEST, that may be your problem. NEST thermostats are notorious for having issues.

As I stated before, have the installing contractor come back out to verify your setup, and replace the thermostat with something besides a NEST thermostat to see if you are happier with the results.

I think you will be.
 
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Discussion starter · #14 ·
Ha, yea, supposed to say Nest. I asked them at install if they thought the nest could cause any issues and they said no. I'll ask again when I have them come out. New thermostat install would be a potentially easy solution. Any recommendations?
 
#15 ·
FargoGuy said:
Ha, yea, supposed to say Nest. I asked them at install if they thought the nest could cause any issues and they said no. I'll ask again when I have them come out. New thermostat install would be a potentially easy solution. Any recommendations?
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I am always a fan of staying with the thermostats of the manufacturer of the equipment. In this case, the iComfort E30.

But if you want to venture outside that, I would recommend any Honeywell 2 stage thermostat.
 
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