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01-23-2021, 05:43 PM
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#21
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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Quote:
Originally Posted by chuckster57
When we add a second ac unit there is usually 12V there, so maybe you could pull from a lighting circuit at the control box. ALL grounds both AC and DC are tied together at the frame.
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Yeah it said to pull from converter or battery to make sure it's a good ground. I appreciate your input. I can figure out but it will take me longer than you guys that work on them all the time.
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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01-23-2021, 05:45 PM
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#22
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,238
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Quote:
Originally Posted by jasin1
Yeah it said to pull from converter or battery to make sure it's a good ground. I appreciate your input. I can figure out but it will take me longer than you guys that work on them all the time.
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Yeah, sometimes it takes a couple of detours. I will admit when it comes to troubleshooting electrical in an RV, my luck has me starting at the wrong end about 90% of the time LOL
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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01-23-2021, 05:46 PM
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#23
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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Quote:
Originally Posted by chuckster57
Without having the furnace in front of me, sounds right, but probably AFTER the sail and overlimit switches, I usually look at the schematic provided on the furnace itself.
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I posted a schematic a few posts above. It seems right. It's definitely different then what I'm used to lol. A different approach to thermostats as well. Most separate fan powered ac systems would have there own control power source and you would utilize a split rh rc terminal.
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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01-23-2021, 05:47 PM
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#24
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,238
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Quote:
Originally Posted by jasin1
I posted a schematic a few posts above. It seems right. It's definitely different then what I'm used to lol. A different approach to thermostats as well. Most separate fan powered as would have there own control power source and you would utilize a split rh rc terminal.
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That’s why I leave the house HVAC to you guys
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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01-23-2021, 05:47 PM
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#25
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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Quote:
Originally Posted by chuckster57
That’s why I leave the house HVAC to you guys
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Lol thanks again
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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01-23-2021, 05:49 PM
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#26
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Junior Member
Join Date: Jan 2021
Location: Littleton
Posts: 8
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Thanks for the time and info guys.
I ended up tying into the yellow -12v at the furnace and ran it to the thermostat. That got the furnace working like it should. Tomorrow I'll tie the ac -B to the blue at the thermostat and see how that goes.
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01-23-2021, 05:51 PM
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#27
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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Quote:
Originally Posted by jasongind
Thanks for the time and info guys.
I ended up tying into the yellow -12v at the furnace and ran it to the thermostat. That got the furnace working like it should. Tomorrow I'll tie the ac -B to the blue at the thermostat and see how that goes.
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Ok good luck. When I hear about a problem... It becomes my problem too. I like to figure things out
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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01-23-2021, 06:02 PM
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#28
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Junior Member
Join Date: Jan 2021
Location: Littleton
Posts: 8
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I couldn't wait, so just went and added the ac -B to the blue wire on the thermostat that I jumped the -12v from the furnace yellow and bam, both furnace and ac systems are working like a gem.
For the -12v that I jumped from the furnace, I just crimped a female spade on the wire and added it to the furnace where another yellow was coming off. Is this alright or should it be further down the line?
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01-23-2021, 06:12 PM
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#29
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,238
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Should be ok. Now go get an adult beverage and sit back and enjoy.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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01-23-2021, 06:14 PM
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#30
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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Quote:
Originally Posted by jasongind
I couldn't wait, so just went and added the ac -B to the blue wire on the thermostat that I jumped the -12v from the furnace yellow and bam, both furnace and ac systems are working like a gem.
For the -12v that I jumped from the furnace, I just crimped a female spade on the wire and added it to the furnace where another yellow was coming off. Is this alright or should it be further down the line?
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All the neg wires should go together. It says to pull a negative at the ac from the converter or battery for a good ground. You should have the w wire from thermostat to a blue wire at furnace that goes to gas valve switch (valve switch)
Red wire from thermostat R terminal going to furnace red. (put a wire nut on the blue wire that goes to 12volt pos. You won't need that one. Hook your b terminal from thermostat to yellow at the furnace 12- and that also goes to ac 12-
I'm going by the schematic in post #15
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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01-23-2021, 06:17 PM
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#31
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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That's it for me tonight lol let me know how it works
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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01-24-2021, 06:59 PM
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#32
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Junior Member
Join Date: Jan 2021
Location: Littleton
Posts: 8
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Quote:
Originally Posted by jasin1
I think if it were me I would try and wire just the furnace first. I would disconnect the ac unit and look at the wiring to furnace only. You may have to pick up 12v - from the furnace. And not the ac so I'm thinking look at the schematic and see what you would need to power the thermostat. I would imagine it would be red white and common (12-)
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Quote:
Originally Posted by jasin1
That's it for me tonight lol let me know how it works
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I finally had a chance to get all the wires ran properly and everything buttoned up. Everything is working as it should. It's so much nicer than the analog and knob controls.
Thanks a lot for all the assistance
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01-24-2021, 07:13 PM
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#33
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,238
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Great to hear! You worked hard for it, well earned
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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01-25-2021, 03:57 AM
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#34
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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Quote:
Originally Posted by jasongind
I finally had a chance to get all the wires ran properly and everything buttoned up. Everything is working as it should. It's so much nicer than the analog and knob controls.
Thanks a lot for all the assistance
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Your welcome! Glad it all worked out for you
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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03-15-2021, 06:58 PM
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#35
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Member
Join Date: Feb 2019
Location: Sandwich
Posts: 32
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A simpler question on this same furnace. I have a NT-20SEQ and would like to switch to a digital thermostat. My AC unit is separate so I just need it to work the furnace. Any suggestion as to which digital thermostat would be appreciated.
Thanks
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