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Thread: Monitor 441 Heater

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    arne97 is offline New Member
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    Monitor 441 Heater

    Have a Monitor 441, about 10+ years old. It came with the house . This is a kerosene vented heater.

    Last night the outside temp was about 8F and the unit stopped working.

    The fire ring will burn but shortly after the heat exchanger fan goes on, the fire goes out and the unit shuts down. The flame is a nice steady blue.

    Referring to manual , I cleaned internal fuel filter. Checked level of fuel in tank.

    Removed external fuel filter and cleaned filter insert. Fuel appeared to be running fine from tank to filter.

    It is VERY difficult to get info on this heater, such as repair manual.

    I don't have the cash to replace the unit before Spring.

    What can I do to diagnose and fix??????????

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    HayZee518's Avatar
    HayZee518 is offline Deity
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    Arne - I have a monitor 41 which is one series BELOW the 441. I do all my servicing on the heater. I have a pdf file for the 441 which I could email to you. as far as a repair manual, you'll never get one. NO ONE on this green earth will EVER sell you one. I tried to get one through MPI but since I'm not an authorized dealer, no way. Some replacement gaskets I was able to get from mc master- carr industrial supply and a piece of boro-silicate glass for the view port.

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    arne97 is offline New Member
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    Monitor 441

    Thanks Hay,

    St.Regis Falls? How's the weather- snicker, snicker - ? I was born in Newcomb, grew up in the snow belt and moved to Virginia 3 years ago. Left my snowblower near Syracuse

    Anywho , I needed a cartridge for the external filter and the guy at my local "has everything" hardware told me what is probably wrong with my heater.

    He said the burner gets distorted and touches a rod and the fuel switches off. Actually,his pencil diagram makes more sense than my explanation.

    So tomorrow's project is to take apart that area and see what is what. It is also an opportunity to get rid of any soot/carbon build-up.

    I'll report back if/if not successful.

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    I been in my house since 2000 and my monitor came with the house. when I moved in I had no idea what to do with it other than tinker around with it getting it to light and stay lit. My fuel tank is the original one that was here. I removed the fuel filter at the tank. It was just another place for water to build up and freeze. I replaced the fuel line with a piece of 3/8" truck air line and suitable air line fittings. These have a brass ferrule that embed themselves as you tighten the gland nut. The only copper piece I have is the flared end that goes on my heater inlet. The copper goes through the house directly to the heater. So when I have to service it I need to shut off the fuel at the tank. I'm gonna change it out this year with an angle fitting and a valve inside the house. OK. when the unit starts up, it goes through a purge cycle of three minutes, then the fuel solenoid pump turns on low and admits fuel to the burner mat. within 30 seconds the igniter turns on and starts the flame. if the flame isn't detected inside of 1 minute the solenoid stops and the lights flash indicating no fuel. you got yahoo messenger? would make this so much easier than back and forth thru the forum. my handle in yahoo IM is buffalo12980@yahoo dot com.

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    HayZee518's Avatar
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    monitor 441

    You'll find a site on the web by Al Luce. Stay away from this guy - he's all hype and no action. He advertises parts for all monitors, but when you go looking for parts you're re-directed to another page on his site with no parts to be found.
    A typical cycle for a monitor is an air purge, then fuel and ignition. with a flame detected the solenoid pump goes into high and so does the flame. After a delay a klixon detects the plenum heat and turns on the fan - lo or hi speed. The flame rod must sense ionized air in the burner pot and complete its circuit or the unit goes into a lockout condition, then resets.
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    arne97 is offline New Member
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    Monitor 441

    A-OK now !

    I opened up the combustion chamber and cleaned it out. What I found was a 1" square piece of soot/carbon leaning against that sensor rod.

    I know carbon can be a conductor but did not realize soot could do that so well.

    Vacuumed everything and heater now works normally.

    I appreciate your help and feel lucky that it was (apparently) something so trivial.

    Yes, I checked out Al Luce's site. It took about 3 pages until I got to the part about not working on Monitors. !!

    I haven't used Yahoo messenger in years.

    Stay warm.

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    HayZee518's Avatar
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    soot IS carbon in its purest form. the black sh*** inside a battery is sawdust and carbon dust with an electrolyte. soot is very conductive. glad it worked out. I got a heat proof gasket material from mc master-carr. got a piece about 4' X 3' and only paid like 9 bucks for it. I made my burner mat out of it - still working and hasn't disintegrated.

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    Interested in Monitor 441 PDF

    My name is Rob & I'm pleased to have found this forum, and you in particular. I, too, have a model 41 which came with the house I bought 10 yrs. ago, and I'm having trouble with it for the first time. It's doing what was described elsewhere in this thread -- behaving as it did when I ran too low on fuel last hear. However, I seem to have enough kerosene & it flows OK when I disconnect the line from the heater.

    Would you mind e-mailing that file to me? I'm on yahoo dot com with the same ID as my login here.

    Thanks,
    Rob

    Quote Originally Posted by HayZee518 View Post
    Arne - I have a monitor 41 which is one series BELOW the 441. I do all my servicing on the heater. I have a pdf file for the 441 which I could email to you. as far as a repair manual, you'll never get one. NO ONE on this green earth will EVER sell you one. I tried to get one through MPI but since I'm not an authorized dealer, no way. Some replacement gaskets I was able to get from mc master- carr industrial supply and a piece of boro-silicate glass for the view port.

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    the flame rod goes in the side of the burner pot and is positioned downward. it's supposed to detect ionized air when there is a flame. basically there is an a.c. voltage on the rod. when a flame hits it, it changes into a d.c. signal to the electronics and through relays and solid state stuff on the computer board, keeps the solenoid pump on depending on need. the solenoid pump can be heard and felt running if you put your finger on the small copper tube. it will be pulsating if it's running right. you can hear a pa-pa-pa-pa when it's pumping. what you'll sometimes find is a lot of crap inside the fuel inlet chamber. the line comes in at the bottom left where there's a little hole. inside the chamber is a stainless steel and plastic filter with a spring on one end. then there's a hole that goes up to the needle valve assembly. there is a very small hole in the bottom of the needle assembly. this is what determines your flow rate of kero to the heater. the kero is gravity feed. with the float fully up the flow shuts off. as it drops kero feeds into the chamber. if there's a slug of kero that comes right in, there's a linkage which flops and shuts off the fuel so it doesn't overflow the chamber. when you press that button on the side you reset the lockout on the solenoid chamber and needle. I'll add you to my yahoo IM.

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    edindex is offline New Member
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    Fuel filter & adjust

    Hay,

    Thanks for the speedy response. Since there's no ignition, I'm pretty sure it's a fuel problem. My supplier hasn't arrived to fill the tank, which shows just under half full (or is it just over half empty?). I asked the dispatcher to make sure the driver was prepared to check & clean/replace the outside filter because I suspect that as the level in the tank drops, there's insufficient pressure to push fuel.

    May I safely assume that the attached image shows the fuel rate adjustment screw in the upper left, & that I must remove the other 2 screws to get at the filter? Is there anything I need to watch out for as I go in there?

    Thanks again,
    Rob
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