RV.Net Open Roads Forum: Class A Motorhomes: Anyone with a THERMOSAN ?

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Class A Motorhomes

Open Roads Forum  >  Class A Motorhomes  >  All

 > Anyone with a THERMOSAN ?

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Sponsored By:
LandYacht35diesel

Florida STAYcation

Full Member

Joined: 10/11/2021

View Profile


Offline
Posted: 01/18/22 04:52pm Link  |  Quote  |  Print  |  Notify Moderator

…. Or something like it … the system that meters grey and black water into the exhaust system ?

Dutch_12078

Winters south, summers north

Senior Member

Joined: 10/07/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 01/18/22 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

Thetford used to sell a "Thermasan" system that injected the waste into the exhaust stream, but it was dropped years ago due to low sales numbers.


Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate


LandYacht35diesel

Florida STAYcation

Full Member

Joined: 10/11/2021

View Profile


Offline
Posted: 01/18/22 05:15pm Link  |  Quote  |  Print  |  Notify Moderator

Roger … thermasan ! … low sales numbers ?

I heard it was banned because a mis-functioning system dumped a load on a Congreemans car !

I can’t imagine it not having good sales numbers with lots of RVers especially blacktop boondockers

Dutch_12078

Winters south, summers north

Senior Member

Joined: 10/07/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 01/18/22 06:13pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like a myth to me... This post from a former Thetford employee seems much more likely to be factual.

Thermasan Waste Distruct System

Matt_Colie

Southeast Michigan

Senior Member

Joined: 10/09/2011

View Profile


Offline
Posted: 01/19/22 09:29am Link  |  Quote  |  Print  |  Notify Moderator

That Former Thetford engineer was ME.

No, there is no way that the dump a load on a congress critter's car can be true, but I love the thought.

At the end of the products life, we were being assailed by exhaust emissions flack. Never mind that it was not true, we are talking about bureaucrats here, and facts just don't matter. I had built a complete dyno and emissions test lab, and that did not show anything of interest. So I set up to pull samples into a gas chromatagraph. That was clear in that the resulting data with a 440 Chrysler engine could tell that the system was pumping, but when I handed out the data without labels, only about half guessed correctly and there were only two sets of data handed out.....

I now wish I had saved enough of the parts to put one on my own coach.

Matt


Matt & Mary Colie
A sailor, his bride and their black dog (one is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.


dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 01/19/22 12:15pm Link  |  Quote  |  Print  |  Notify Moderator

Thermosans were around in the late 1970's. I have never seen or heard of it after 1980. I have been a RV tech since 1979 and have only seen just one. That was in 1979. I "think" it was on a 77 or 78 GMC motorhome. They were aftermarket. Urban legends always seem to include a Hi level Gov. official. NOT practical with todays market and designs. Besides, I am sure it would violate numerous EPA type laws and regulations. Doug

Dutch_12078

Winters south, summers north

Senior Member

Joined: 10/07/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 01/19/22 04:59pm Link  |  Quote  |  Print  |  Notify Moderator

Matt_Colie wrote:

That Former Thetford engineer was ME.

No, there is no way that the dump a load on a congress critter's car can be true, but I love the thought.

At the end of the products life, we were being assailed by exhaust emissions flack. Never mind that it was not true, we are talking about bureaucrats here, and facts just don't matter. I had built a complete dyno and emissions test lab, and that did not show anything of interest. So I set up to pull samples into a gas chromatagraph. That was clear in that the resulting data with a 440 Chrysler engine could tell that the system was pumping, but when I handed out the data without labels, only about half guessed correctly and there were only two sets of data handed out.....

I now wish I had saved enough of the parts to put one on my own coach.

Matt


Thanks for the additional info, Matt!

LandYacht35diesel

Florida STAYcation

Full Member

Joined: 10/11/2021

View Profile


Offline
Posted: 01/21/22 09:15am Link  |  Quote  |  Print  |  Notify Moderator

Yo Matt …. Was the operation of that TUNED INTO the total warmed up engine and speed of the vehicle?

Matt_Colie

Southeast Michigan

Senior Member

Joined: 10/09/2011

View Profile


Offline
Posted: 01/21/22 09:49am Link  |  Quote  |  Print  |  Notify Moderator

LandYacht35diesel wrote:

Yo Matt …. Was the operation of that TUNED INTO the total warmed up engine and speed of the vehicle?


Land,

The early systems included a mini-muffler (called a sanitizer) that had a thermocouple in it, and a road speed switch. This was kind of expensive and after considerable testing, they changed to a vacuum switch (there were very few diesels at that time) and a time delay. Both systems insured that the exhaust systems were hot before pumping started.

The systems without a "sanitizer", had a stainless probe and a screen (about 100 iirc) to insure that no large particles were released into the exhaust stream.

Both of these systems came to an issue with the primitive state based emission laws of the day. Many simply demanded that no vehicle exhaust system could be modified from what was manufactured. This destroyed the aftermarket in many states. As it could not even be a dealer installed option, that lead to reduced sales.

The pumping rate could be controlled with the selection of the tubing size in the peristaltic pump element, but it was found that the standard selection was good enough for all the test coaches we had available to us. This was all part of the "odor limit" controls. There was never any doubt when a following vehicle would know it was working.

Matt

LandYacht35diesel

Florida STAYcation

Full Member

Joined: 10/11/2021

View Profile


Offline
Posted: 01/21/22 10:04am Link  |  Quote  |  Print  |  Notify Moderator

How much was that system back then ? Was it a DIY job typically ?

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Class A Motorhomes  >  All

 > Anyone with a THERMOSAN ?
Search:   Advanced Search

Search only in Class A Motorhomes


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2022 CWI, Inc. © 2022 Good Sam Enterprises, LLC. All Rights Reserved.