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01-28-2017, 12:39 PM
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#1
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Member
Join Date: Feb 2015
Posts: 74
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Changed t-Stat, something wrong
Researched on here but can't find answer. AC and heater run at same time.
Replaced Dometic Analog T-Stat with Honeywell RTH221B T-Stat,
Dometic wiring: Red-7.5V
Yellow-AC
White-Furnace
Blue-Hi Fan
Brown-Low Fan
Green-Ground
Connected wires to Honeywell: Red-taped
Yellow- "Y"
White- "W"
Blue/Brown- "G"
Green- "RC"
Did it this way as I read another article that wired it this way but was using a hunter T-Stat.
R and RC have a jumper that I left alone. Heater works great even with AC blowing air, Fan switch blows air. I tried AC auto switch both nothing happened. Leaving for work assignment next week, hope to get it fixed. Probably wrong wire placed but didn't experiment not wanting to mess something up. Thanks
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01-31-2017, 10:27 AM
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#2
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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It looks like you have it wired correctly.
Did you set the jumper for gas heat? Though I don't think that'd be the problem?
There's not a stray wire between the 'W' and 'G' terminals is there?
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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02-01-2017, 02:20 PM
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#3
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Member
Join Date: Feb 2015
Posts: 74
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I looked inside cover switch, it was on electric/heat pump, other one was gas so i switched it to gas last night and i think that fixed the problem. Will test tonight after doc appt. Thanks for the info, appreciate it very much.
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02-01-2017, 03:07 PM
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#4
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Senior Member
Join Date: Jun 2013
Posts: 10,833
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Remove the Jumper. The Heater and AC are totally separate units.
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B and B
2022 Venture RV SportTrek STT 302 VRB Travel Trailer
2018 Heartland Landmark 365 Louisville 5th Wheel
2015 Heartland Bighorn 5th Wheel
2013 FR Rockwood 8289WS 5th Wheel
2012 FR Rockwood 2703 SS Travel Trailer
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02-02-2017, 05:28 PM
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#5
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Member
Join Date: Feb 2015
Posts: 74
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Thanks guys, it is fixed. Appreciate it.
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02-02-2017, 06:04 PM
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#6
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Senior Member
Join Date: Nov 2016
Posts: 337
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Quote:
Originally Posted by Racer310
Thanks guys, it is fixed. Appreciate it.
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By what? Removing the jumper, or the switch to gas or both?
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02-02-2017, 06:18 PM
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#7
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Racer310
Researched on here but can't find answer. AC and heater run at same time.
Replaced Dometic Analog T-Stat with Honeywell RTH221B T-Stat,
Dometic wiring: Red-7.5V
Yellow-AC
White-Furnace
Blue-Hi Fan
Brown-Low Fan
Green-Ground
Connected wires to Honeywell: Red-taped
Yellow- "Y"
White- "W"
Blue/Brown- "G"
Green- "RC"
Did it this way as I read another article that wired it this way but was using a hunter T-Stat.
R and RC have a jumper that I left alone. Heater works great even with AC blowing air, Fan switch blows air. I tried AC auto switch both nothing happened. Leaving for work assignment next week, hope to get it fixed. Probably wrong wire placed but didn't experiment not wanting to mess something up. Thanks
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I understand you've gotten it working, but something about your wiring makes no sense. You say you taped off the red wire, which should be the positive power supply. so that makes no sense. You attached the ground wire to RC, which is where the positive power (red) wire should go to. I've attached a diagram for my RTH111B. The ground wire is unused because the old thermostat wasn't battery powered, so the positive DC voltage not only ran to the furnace and AC when the T-stat told it to, but it also powered the T-stat's brains, using the ground wire for return (negative). The furnace and AC have separate returns (negative) that don't go to/from the T-stat.
The T-stat is basically a switch that connects R to either W (furnace) or Y (AC) when called upon by the temperature. With batteries powering the brains, there's no need for a ground wire.
You'll see I also installed a switch to allow either fan speed to run.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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02-03-2017, 07:29 AM
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#8
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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The difference is that you have a Coleman and he has a Dometic. Dometic, in their infinite wisdom, switches the negative side of the circuit and not the positive side. Therefore, you have to hook the negative wire to R/RC to get it to work.
The thermostat doesn't care because it's just flipping a switch (relay/triac) to make the connections.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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02-03-2017, 09:49 AM
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#9
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Member
Join Date: Feb 2015
Posts: 74
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Took jumper out and left green wire to RC but only 1 unit worked. Green wire to R and the other unit worked. Put jumper back in and green wire back to RC, flipped a switch to gas (not electric/hey pump) and each unit worked. I think initial problem was not flipping the switch to gas. Thanks
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02-03-2017, 12:09 PM
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#10
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Thanks for letting us know that you tried removing the jumper and it split the units, which is exactly what should have happened.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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02-03-2017, 03:50 PM
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#11
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Bama Rambler
The difference is that you have a Coleman and he has a Dometic. Dometic, in their infinite wisdom, switches the negative side of the circuit and not the positive side. Therefore, you have to hook the negative wire to R/RC to get it to work.
The thermostat doesn't care because it's just flipping a switch (relay/triac) to make the connections.
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Aha! ("I see," said the blind man - as he picked up his hammer and saw!)
I'm assuming the furnace must also be wired to be switched on the negative side, then, too.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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02-06-2017, 11:17 AM
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#12
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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That is mostly correct. There's a relay in the ceiling box that sends power to the furnace and that relay has the negative switched.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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02-06-2017, 11:30 AM
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#13
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Bama Rambler
That is mostly correct. There's a relay in the ceiling box that sends power to the furnace and that relay has the negative switched.
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So how do they handle the furnace?
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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02-07-2017, 10:04 AM
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#14
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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There are relays in the A/C ceiling box for the A/C fan, compressor and one for the furnace. when in furnace mode, the relay powering the furnace, switches on and off in response to the thermostat switch opening and closing. So the thermostat powers the relay and the relay powers the furnace.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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02-07-2017, 12:03 PM
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#15
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Bama Rambler
There are relays in the A/C ceiling box for the A/C fan, compressor and one for the furnace. when in furnace mode, the relay powering the furnace, switches on and off in response to the thermostat switch opening and closing. So the thermostat powers the relay and the relay powers the furnace.
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So they run the furnace T-stat wiring to the AC? Weird. If I were trying to follow the wiring, I would never have been expecting that.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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