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09-28-2017, 11:43 AM
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#1
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Junior Member
Join Date: Sep 2017
Posts: 4
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New digital thermostat
I have read several other forums on upgrading to digital thermostat, with that I just installed a Honeywell RTH221B.
Hooked tow wires up from Suburban old thermostat, Green/white wire that was on R thermostat to R/RC to digital and White wire to G on digital.
Intalled two AAA Batteries to Digital Thermostat
Propane on, Battery charged and connected, No Fan/heat.
What have I done wrong or do I have wrong thermostat?
Thanks
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09-28-2017, 11:55 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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What model was your old thermostat?
How many wires in total did you hook to the new thermostat? Should be more than two.
You'll at least need to hook up the fan wire(s) in addition to the ones listed above.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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09-28-2017, 12:29 PM
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#3
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Senior Member
Join Date: Nov 2015
Posts: 672
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A two wire system is just a switch basically. If you connect the two wires together does your heater work?
I ran an extra set of wires to the bed area and installed a switch so I can force the heat on before I get up. We run the thermostat fairly low at night to conserve battery.
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09-28-2017, 12:42 PM
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#4
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Junior Member
Join Date: Sep 2017
Posts: 4
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There were only two wires coming from furnace to Suburban thermostat. I hooked them up what I thought was correct instructions from Honeywell Digital Thermostat
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09-28-2017, 12:59 PM
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#5
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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One wire should be on R, the other on W. R and RC are usually jumpered together.
The attached may help you, although it's for a 111, not a 221. The 221 is programmable, the 111 is not. The switches shown in the dotted box show you what the thermostat actually does, although it does it with solid state devices.
For heat, the thermostat connects R to W.
For AC (which you apparently don't have), it connects R to Y to start the compressor and connects R to G to run the AC's fan, either through the AC's switch if you're in Auto, or directly from R if you're in ON. If you were to set the fan from "auto" to "ON," you would be connecting R directly to G without the AC compressor coming on. If you really have your wires on R and G, try changing the fan to ON and I'll bet your furnace starts up.
__________________
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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09-28-2017, 01:57 PM
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#6
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Ambassador
Join Date: Apr 2015
Location: EBF NC
Posts: 281
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Quote:
Originally Posted by rbrockwood
I have read several other forums on upgrading to digital thermostat, with that I just installed a Honeywell RTH221B.
Hooked tow wires up from Suburban old thermostat, Green/white wire that was on R thermostat to R/RC to digital and White wire to G on digital.
Intalled two AAA Batteries to Digital Thermostat
Propane on, Battery charged and connected, No Fan/heat.
What have I done wrong or do I have wrong thermostat?
Thanks
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Rv Comfort Coleman-mach 12- volt Digital is what you want fits exactly with no extra rigging or alteration.
__________________
2016 Ford F250 Crew Cab 6.2 L w/Ride Rite Air Leveling System.
2017 Rockwood Signature Ultra Lite 8335BSS
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09-28-2017, 02:10 PM
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#7
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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I should have picked up on the fact that it's just a furnace from you saying 'Suburban'. :O
In that case, Rockfordroo has you covered.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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09-28-2017, 02:10 PM
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#8
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Ken K.
Rv Comfort Coleman-mach 12- volt Digital is what you want fits exactly with no extra rigging or alteration.
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We don't know that he has a Coleman-Mach. He apparently has no AC, so I'm guessing that he just has one of those lousy Suburban analogs like this one:
__________________
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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09-28-2017, 02:38 PM
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#9
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Ambassador
Join Date: Apr 2015
Location: EBF NC
Posts: 281
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What? Everyone has AC ...
__________________
2016 Ford F250 Crew Cab 6.2 L w/Ride Rite Air Leveling System.
2017 Rockwood Signature Ultra Lite 8335BSS
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09-28-2017, 02:40 PM
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#10
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Junior Member
Join Date: Sep 2017
Posts: 4
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Thanks everyone, connecting to W terminal on thermostat did the trick, had it on G, as I thought that might be ground.
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09-28-2017, 02:42 PM
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#11
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Ambassador
Join Date: Apr 2015
Location: EBF NC
Posts: 281
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Well glad everything worked out. Safe travels.
__________________
2016 Ford F250 Crew Cab 6.2 L w/Ride Rite Air Leveling System.
2017 Rockwood Signature Ultra Lite 8335BSS
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09-28-2017, 02:43 PM
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#12
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Quote:
Originally Posted by Ken K.
What? Everyone has AC ...
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Not if it's a popup, they don't. The OP never said what he had, only that it only had 2 wires.
__________________
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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09-29-2017, 09:36 AM
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#13
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Quote:
Originally Posted by rbrockwood
Thanks everyone, connecting to W terminal on thermostat did the trick, had it on G, as I thought that might be ground.
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Thanks for coming back and letting us know that you got it fixed, and how you did it. It will surely help someone in the future.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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