Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
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 06-08-2011, 12:52 PM   #1
Junior Member
 
Join Date: Apr 2011
Posts: 3
atwood 7900-11 operation

Hi, just installed a new atwood 7900-11 furnace, could any one tell me how it should run, when I turn up the thermostate the blower comes on and the furnace hasnt even lit yet, is this normal? It fails to light most of the time. I was wondering if i have the thermostate wired right? there are 3 wires coming out of the furnace red, black and white, i took the white wire and a positive 12v to the thermostate. I also installed a new regulator, gas refrig, stove and water heater all work fine, but the furnace is killing me, thanks if any one has any sugestions on whats wrong.
__________________

__________________
jim ayers 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 06-08-2011, 12:57 PM   #2
Community Administrator
 
Route 66's Avatar


 
Newmar Owners Club
Retired Fire Service RVer's
Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,437
Yes. The blower should run for a period of time to exhaust any propane in the combustion chamber to prevent an explosion upon ignition.
__________________

__________________
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP

Route 66 is offline   Reply With Quote
Old 07-08-2011, 07:20 AM   #3
Senior Member
 
SUMDALUS's Avatar
Commercial Member
 
Join Date: Jul 2010
Posts: 163
Jim,

Hopefully your furnace is working by now.

If not, here is some information for you concerning your 7900-II: (this information came from an original Hydroflame 7900 manual - Atwood bought Hydroflame some time ago.)






What the manual doesn't tell you:

The fan runs first to "purge" the combustion chamber. When the gas valve opens, you should hear a single "snap" sound. Next, you should hear the rapid "ticking" of the ignitor. These sounds occur in immediate sequence: "snap" then "ticking" (and they are different). The rapid "ticking" will last for about six seconds then stop. The fan will contine to run to purge the unlit propane from the chamber, then the board will try to cause ignition again. After three unsuccessful tries to ignite, all the furnace functions stop completely. It's a safety item referred to as board "lock-out". You must turn the t-stat "OFF" completely, then "ON" again to reboot the board and restart the sequence.

Have you heard the two sounds described? (You may have to get close to the furnace to hear them.) If you have NOT, the board is not getting the necessary 12 volts to function - check the t-stat and 12 vdc power supply. If you HAVE, you now have two other possibilities - gas flow and ignitor function. Check both.

Hope this helps.
__________________
Dale Lee Sumner
RVIA/RVDA Master Certified RV Service Technician
www.sumdalus.com
SUMDALUS is offline   Reply With Quote
Old 07-09-2011, 04:33 AM   #4
Junior Member
 
Join Date: Apr 2011
Posts: 3
thanks for the the help, good info, It is working great now.
__________________
jim ayers is offline   Reply With Quote
Reply

Tags
atwood



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
Entry Step Operation Monaco38 Monaco Owner's Forum 21 09-25-2010 07:14 AM
Atwood & Suburban water heaters & Furnace "007" RV Systems & Appliances 1 08-07-2010 09:37 PM
Atwood Range Top bigfish Alpine Coach Owner's Forum 9 01-29-2010 12:34 AM
No spark in Atwood furnace gg RV Systems & Appliances 1 01-14-2010 05:14 PM
Atwood Windows Woody Winnebago Industries Owner's Forum 24 11-04-2007 04:58 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:22 AM.


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