Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 06-08-2008, 01:42 PM   #1
Senior Member
 
Darryl's Avatar
 
Monaco Owners Club
Join Date: Nov 2006
Location: Smyrna, GA
Posts: 223
My '97 Endeavor has the 4 button Dometic Comfort Control thermostat system, with two A/C units on the roof. I'm trying to figure out the logic of this thermostat. If you set the front & rear unit to the same degree setting, the rear will kick of several degrees before the front does. I can understand this happening, if they had different "thermisters" (one in the back and one in the front), but they don't. There is no sensing unit in the rear and the best I can tell, only one in the front (inside the thermostat). At least, if there is one in the back, it must have the Klingon cloaking device around it ---- I can't find one anywhere.

So this leaves me with one conclusion. There must be logic in the control that turns off the rear unit X degrees before the front. Both A/C's are plumbed into the same distribution ducting. Air comes out into the motorhome front-to-rear when either are on. Adding the second unit only increases the volume. By the way, I installed a new Comfort Control thermostat this week and it does the same thing as the orginal.

If anyone has any knowledge of how these work, your reply would be most appreciated.
__________________

__________________
Darryl
Smyrna GA
Darryl is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-08-2008, 01:42 PM   #2
Senior Member
 
Darryl's Avatar
 
Monaco Owners Club
Join Date: Nov 2006
Location: Smyrna, GA
Posts: 223
My '97 Endeavor has the 4 button Dometic Comfort Control thermostat system, with two A/C units on the roof. I'm trying to figure out the logic of this thermostat. If you set the front & rear unit to the same degree setting, the rear will kick of several degrees before the front does. I can understand this happening, if they had different "thermisters" (one in the back and one in the front), but they don't. There is no sensing unit in the rear and the best I can tell, only one in the front (inside the thermostat). At least, if there is one in the back, it must have the Klingon cloaking device around it ---- I can't find one anywhere.

So this leaves me with one conclusion. There must be logic in the control that turns off the rear unit X degrees before the front. Both A/C's are plumbed into the same distribution ducting. Air comes out into the motorhome front-to-rear when either are on. Adding the second unit only increases the volume. By the way, I installed a new Comfort Control thermostat this week and it does the same thing as the orginal.

If anyone has any knowledge of how these work, your reply would be most appreciated.
__________________

__________________
Darryl
Smyrna GA
Darryl is offline   Reply With Quote
Old 06-09-2008, 01:36 AM   #3
Community Moderator
 
RV Wizard's Avatar


 
Country Coach Owners Club
Appalachian Campers
Gulf Streamers Club
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 12,062
Darryl, there are two thermistors used on the two zone setups. One is in the t'stat and one is located in the zone two area. It can be on the underside of a cabinet, on a wall or may even be near or in the return air. I suspect that you have a vent directing airflow directly onto the zone two thermistor to cause it to cycle the unit off sooner. Call Monaco and ask for tech support to reveal location if you don't find it.
__________________
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
RV Wizard is offline   Reply With Quote
Old 06-09-2008, 05:35 PM   #4
Senior Member
 
Darryl's Avatar
 
Monaco Owners Club
Join Date: Nov 2006
Location: Smyrna, GA
Posts: 223
Thanks Mike for the reply. I have hunted everywhere for that rear thermister and can't find it anywhere! H.R. really hide this one. Unless it's in the intake of the A/C, I can't imagine where it is. (The guy that hide these must be the same guy that hide the Easter Eggs when I was a kid ----- I never could find the darn things!!!) Tomorrow I will call H.R.
__________________
Darryl
Smyrna GA
Darryl is offline   Reply With Quote
Old 06-09-2008, 05:47 PM   #5
Senior Member
 
footdoc's Avatar
 
Join Date: Jul 2006
Location: Mobile, Alabama
Posts: 1,002
Mike...on my coach, I just found a second thermistor...there is one in the bedroom and I assumed the other was up front over the windshield in the tstat body...a bad/hot place to be...My one for the front zone was just found under a kitchen cabinet...a much more logical place for it
__________________
2006 Mountain Aire 43 and 05 Honda Pilot
Air Force One..Real Whirlpool Fridge !
3 sugar gliders, long hair daschund and short hair wife for security
footdoc is offline   Reply With Quote
Old 06-09-2008, 06:05 PM   #6
Junior Member
 
Join Date: Mar 2008
Posts: 24
I have the same ac type of unit. I have a rear temperature sensor it is not a thermostat. Mine looks like a plastic vent that is about the size of a silver dollar. I removed the cover and it is just a resistor (or some electrical component that senses the temperature). Mine is on the side of a cabinet by the head of the bed (all the way in the rear of the RV). I hope this helps.
__________________
Glen

Glen M is offline   Reply With Quote
Old 06-09-2008, 06:25 PM   #7
Senior Member
 
Darryl's Avatar
 
Monaco Owners Club
Join Date: Nov 2006
Location: Smyrna, GA
Posts: 223
Guys, I found it. It was located inside the air intake for the rear A/C. It resembles a telephone cord, about 10 feet long, with a heat sensor at the end. Very thin/small sensor with heat shrink around it, except for the tip.

I'd really like to put it in a remote area, out of the air intake, but that isn't really possible without running the wire across the ceiling. Probably the next best thing would to be to mount it on the bottom side of the A/C panel, at the opposite end of the air intake. This would get it out into the ambient air more. Does anyone know if they make a surface mount "holder" for the sensor?
__________________
Darryl
Smyrna GA
Darryl is offline   Reply With Quote
Old 06-11-2008, 08:15 AM   #8
Senior Member
 
Damon Owners Club
Ford Super Duty Owner
Join Date: Apr 2008
Location: NAS Pensacola, FL
Posts: 329
The attachment can be anything of your choosing. Do not place the sensor (tip) in contact with anything - allow air to freely circulate around the tip. The clamping/mounting device should not crush the wiring. Do not bend anything under the shrink tubing. Drilling a small hole in a panel and slipping the tip through the opening should suffice for that sensor if you wish to hide it.
__________________

__________________
Ted Fulltiming in the DreamCatcher a
2008 Challenger 371PE on F53 w/ 2010 Cobalt
R'V there yet?
teddyu is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Comfort Control htr/ac panel question Gypsy's Jaunt National RV Owner's Forum 4 01-09-2009 07:07 PM
Help???? Five button control comfort control Center Davestoy RV Systems & Appliances 16 03-10-2008 01:34 PM
Duo-Therm Comfort Control mceaches Newmar Owner's Forum 3 01-10-2008 05:36 AM
Help???? Five button control comfort control Center MH-General Discussions & Problems 16 12-31-1969 07:00 PM
Help???? Five button control comfort control Center Monaco Owner's Forum 16 12-31-1969 07:00 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:12 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.