Here s the principle in a perfect operational Hot Surface Ignitor (HSI) heater:
Plug the unit in.
When power is applied, the ignitor (glowbar) glows. After a delay, the motor starts to turn, the fan blows air through the combustion chamber, the fuel begins to flow, because the air pump (rotor) is directly connected to the motor shaft. Air is delivered to the nozzle adapter by the air pump. At the nozzle adapter, the passing air creates a venturi effect, sucks fuel from the tank and thereby delivers fuel to the nozzle at a precise fuel/air rate for atomization.
The photocell starts looking for a flame in the chamber
When the atomized fuel contacts the glowing ignitor, there is combustion.
Then, after 5-7 seconds the ignitor no longer glows and the flame continues to burn on it s own and it should burn until the fuel supply is gone or power is disconnected.
The photocell takes over and monitors the flame for color. Too rich/lean and the flame color changes, or any momentary flame-out and a signal is sent to the computer control board and there will be a shutdown by the electronics.
Now, these heaters are computerized and the computer wants to find a system that is operating at 100%.
IMPORTANT: At less than 100% the system shuts down for safety and environmental reasons. Simply stated- the computer is looking for a reason to shut the unit down because that is its job.
I am going to list some of the reasons that will cause a shutdown in the order of incidence, in our shop anyway.
Water in the fuel people love to buy parts but this is a free fix, just drain the tank. Shine a flashlight in the tank & look for water droplets & trash.
The pump pressure not set to specs. There is not a fudge factor here. Instructions for setting the pump pressure are at http://reddyparts.com/pressure.htm .
The air pumps on the old style heaters could be adjusted to suit the operator s nose. If the heater smells just adjust the pressure a little until it smells good. Not so with the new heaters- you adjust to suit the computer, not you.
Air leak. If there is a crack in the plastic end cover, air line, fuel line, or nozzle adapter. These conditions create a lean mixture--poor flame color
Defective or worn nozzle. Desa warns about annual replacement in their manuals. Depending on annual "hours used" this may or may not be your problem.
Defective control board and/or photocell. Eliminate all of the above reasons for your heater s failure before blaming the electronics.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.