We recently had a nest thermostat 3rd gen installed and I don't think it's programmed/wired correctly.
We had our HVAC system replaced 2 years ago and I was told we have a 2 stage heat pump and 2 stage electric heat unit.
The unit numbers are HRG1660S1M and HCG60V1M-1.
I have no idea how the previous thermostat was wired but the person who installed the nest seemed worried when we told them how much our electric bill was during the winter, he said it sounded like the heat pump was not coming on, only the heat strips. He set up the nest and left. We had to call him back because only cold air was blowing (I could hear the outside unit on). After he adjusted a few items the heat came back on and that was that. Now I don't see the outside unit coming on. I touched the copper pipes coming out of the unit after the vents were blowing hot air and they were ice cold.
Below are pictures for current nest wiring, outside unit wiring and diagram, attic unit wiring and diagram.
Since he said we have a 2 stage heat pump with 2 stage electric heat, I asked we the jumpers for w1-w2, o-r-ds and y1-y2 were still on, he said they need to be installed for relay delays and that they don't come on all the time.
Anyhow, if someone can confirm if this is correct or not I would really appreciate it!
Current Nest Wiring Outside Unit Wiring Outside Unit Wiring Diagram Attic Unit Wiring and Jumpers Attic unit Wiring Diagram
There is nothing on Nest's OB connector so it is not running as a heat pump, only AC. The O (orange) is jumpered to R at the air handler to lock out the heat pump function. The outside unit has nothing on Y2 so only running single stage.
I hope that was a friend and not a tech. If it's a tech..... fire him.
Your heat pump system is not wired as a heat pump system.
I see several major issues here.
You do have two stage electric heat but I think it should remain as single stage.... as it currently is.
At the stat....
Connect orange to O/B.
Move white wire to W2/AUX (program nest for heat pump with aux heat)
Move black wire to the * terminal. (program * for emergency heat.)
NEST: Two stage heat pump with aux heat. Two stage cooling.
At the air handler.......
Leave the jumper on W1 to W2.
Remove the R to O jumper. (this jumper keeps heat pump locked in cooling mode)
Remove Y1 to Y2 jumper to engage two stage cooling.
The Y2 wire (brown coming from attic) has a wire nut with the light blue (at outside unit), and is not terminated on a screw.
Yeah, I don't think this guy will be coming back... I'll make the changes suggested in the morning and let y'all know if that fixes issues, I really do appreciate the help!
Last edited by evigil; 12-30-20 at 09:37 PM.
Reason: Added more info.
I made the changes as listed above and it appears to be working properly now. I do have 2 questions that came up on the thermostat when I was setting it up:
Use the heat pump compressor when the outdoor temperature is above: the default is "always". Should I change it?
and
Use the heat pump auxiliary heat when the outdoor temperature is below: the default is 50*.
Use the heat pump compressor when the outdoor temperature is above: the default is "always".
Should I change it?
Use the heat pump auxiliary heat when the outdoor temperature is below: the default is 50*.
Are you new to a heat pump system ?
Typically a homeowner will know the point where the heat pump no longer works effectively.
If you set it to always it will never shut off no matter how cold it gets. Knowing the lowest effective temperature of the system can guide you. The aux should only come on when the heat pump can't keep up.
I've been trying to figure out the wiring of my system by searching previous threads and had a few follow up questions.I am trying to install a Wyze thermostat (similar to Nest) [url]https://wyze.com/wyze-thermostat.html[/url]
I currently have a Carrier M/N: 58CVA070 and the thermostat has V+ and Vg terminals. The line from the wall has Red, White, Yellow, Green, and Blue wires with the Red connected to V+, the White connected to Vg and the other 3 not connected to anything. The lines out of the EIM has a 2 wire R/W for V+/Vg and a 5 wire one for Rh, W/W1, G, Y/Y2, C. So which one of these lines is going to the stat? Are the 3 unused wires at the stat even connected to anything? Can you just use the 5 wires at the stat to connect my new one?
[img]https://cimg6.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/img_5173_a7adc4b6cecccc37147f8884c1ebc9166840d507.jpg[/img]
[i]Furnace[/i]
[img]https://cimg8.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/img_5176_25bb6d868cbc28de6cab1186076eb8694d1e0c7f.jpg[/img]
[i]Carrier Stat[/i]
[img]https://cimg1.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/img_5177_ce7c0da5c6a7dc259a87d8d7835637a0282370a2.jpg[/img]
[i]Inside Carrier Stat[/i]
[img]https://cimg2.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/img_5178_78a18dd23e3b207efd7cf29662d274531c5c48c4.jpg[/img]
[i]EIM Wiring[/i]
[img]https://cimg3.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/img_5179_2d7afe767562d81831e9d7076ab238f4c12089b7.jpg[/img]
[i]EIM Wiring Guide[/i]
Hi all,
My home has a Honeywell L7224 aquastat controller ([url=https://customer.honeywell.com/resources/techlit/TechLitDocuments/68-0000s/68-0281.pdf]manual[/url]) which is connected to a couple of two-wire Hunter battery-operated thermostats, which I am looking to replacing with Honeywell RTH9585WF Smart Thermostat (wifi) which require a C wire. At my skill level I can run wires so I'm not concerned about that.
Unfortunately the L7224 doesn't have a obvious C wire connection but I found an old but promising thread here, [url=https://www.doityourself.com/forum/thermostatic-controls/520699-wiring-new-honeywell-thermostat-honeywell-aquastat-controller.html]Wiring a new Honeywell Thermostat to Honeywell Aquastat Controller[/url] in which @PJmax suggested that there may be 24Vac between terminals marked T and 2 in the schematic. I measured this yesterday and I measure ~27Vac across those terminals, and ~13Vac between T and 1.
My question: can I connect the C wire to terminal 2 of this aquastat and pull it up to the thermostat?
Secondly, I have another zone in the basement, and also a hot water heater connected to this aquastat. How would I handle the second thermostat?
12-30-20, 03:53 PM
