Open question: Is "3 heat/2 cool" the correct system type for a 1-stage heat pump and 2-stage furnace, using a Lennox Comfortsense 5000?
G71MPP is not heat pump, it is high efficiency Variable Capacity Gas Furnace.
Two-Stage Gas Valve
Variable Speed Blower Motor
All Dip switch are set Down (off I think)
LED is displaying H1A622 what does this mean?
Thermastat only using 5 wires
W, W2 , R, G, Y
I don't know why you want to Hijack this Thread.
You should start a new one, or search against your issue before posting at all.
Check out this Thread. It may be helpful:
Originally Posted by thekenward
Agreed, and also the Cycles per Hour setting...
Well, I bit the bullet and called the Contractor.
The last straw was at about 8:30 this morning when I glanced at the Stat's outside temperature and it was 36 °F. Then less than an hour later I glance at it and it's 49 °F. Now I know outside temps will swing, but on an overcast day here in Lotusland it doesn't move like that.
According to the Weather forecast it's supposed to swing between a high of 46 °F and a low of 34 °F in the next 24 Hours => not in one hour.
The Contractor is very responsive as they said they will be here between 2 & 4 pm today. (Can't beat that!) I decided to ensure I got someone on top of their game with respect to the Tech and asked a few questions. The poor receptionist / service scheduler was quite lost on coefficient of performance (she never heard of it before) so I had to explain it to her. (The Blind leading the Blind...)
So I've made a note to ask about:
1- System Type (0170 - Set to 12 - 3 Heat / 2 Cool Heat Pump with Aux Heat) just so I understand why.
2- Cycles per Hour (0260 - Set to Standard Efficiency fossil fuel Furnaces when I've got a High Eff. G61.) I really don't know what the imapct of this setting will do. But...
3- Heat Pump Compressor Lock out (0350 - set to 35 °F). How did they arrive at this number? Science Please...
4- Adaptive Intelligent Recovery (0530)- This is disabled - Why? I would think we be using the "brains" of the Stat to learn the enviroment and adapt. My Old dinosaur Stat did that.
5- Heating Mode Extended Fan On (0650) - just want clarification as to benefits / issues.
While I was writing this I got an email back from Lennox! It says:
I have requested an extended ratings document from engineering on this product. As soon as I get this document I will forward it to you.
It should answer most of your questions.
So things may be coming together soon. I will advise.
That is fantastic. Please let us know what transpires. If the tech makes any changes, I may want to contact them as well.
1. Interesting that he changed the system type. Everything still working well, or have things changed?
2. There are several codes for setting Cycles per Hour. I'm guessing that one of the others is now set to 5 instead.
3. If you read the XPG15 manual (that the installer hopefully left for you), it seems to me to indicate that the heat pump won't operate below 32 F anyways (pg. 37, #3) . I could just be interpreting this wrong.
I've also since been reading that the Comfortsense 5000, when used for these units, doesn't control when the furnace goes into high fire -- that decision is made by the furnace, if the heat demand isn't satisfied after 10 minutes (the delay is set on the furnace's electronics). I've read opinions that it's more desirable to let the stat do that instead of having it timed, but that requires an upgrade to the Comfortsense 7000. The 5000 essentially acts like a 1-stage stat with our 2-stage furnaces. I'm still looking into that one.
Edited to add:
I've been talking to another tech on a different forum. (I don't think naming the forum would be in line with hvac-talk.com's rules.) He informs me that the XPG15 has a built-in temperature change over switch which shuts it down at around 32 F, and that the outdoor temp. sensor should be used for display only. He echoed that the settings for the stat as described in the documentation are correct.
Take a look at Lennox's own doc. for the XPG15: http://tech.lennoxintl.com/PDFs/506212c.pdf to see that the heat pump controls the switchover temperature (pg. 1). If you look through the guide, you can see what the stat's settings should be (pg. 24). Apparently the XPG15 is quite different from Lennox's heat pumps that are not dedicated dual-fuel units. The concern I'd have is that the stat's setting of balance point would conflict with the XPG15's control of switchover.
The contractor is coming out tomorrow to upgrade me to the ComfortSense 7000, and I'll be hanging around to make sure they set it up according to the manual. I'll let you know how it goes!
usually the heat pump is allowed to run at the same time as electric back up heat strips.
it should NOT run at the same time as fossil fuel back up.
Are you sure he has the XPG15? That is supposed to be a dual-fuel unit, not a heat pump with electric backup.
Originally Posted by -Jim-