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  1. #1
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    Monitor Vented Kerosene Heater

    Picture of a Monitor M41 heater. Shows component parts. Service manuals are Not Obtainable from anyone except an authorized dealer.

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    Venkman (06-27-2015)

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    Quote Originally Posted by HayZee518 View Post
    Picture of a Monitor M41 heater. Shows component parts. Service manuals are Not Obtainable from anyone except an authorized dealer.
    thanks for the picture. one question, would replacing both exhaust O rings take care of an exhaust smell? Also, where is the damper solenoid located? and how is it accessed?
    thanks a million

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    because the M41 is a totally vented system you should not smell any kerosene exhaust. the damper solenoid is located inside the combustion blower shroud. you'll need to remove the shroud and take apart the blower to get at it. the only o ring in it is around the wires which come out of the fan motor and damper solenoid. the are no o rings on the damper. the damper is a plastic flap that opens and closes when air is needed. there are two o rings in the exhaust line - one at the outside house connection tee and one inside the unit where the offset tube goes. there are gaskets at the combustion pot top, front, view port front and first exhaust fin. also on the combustion pot bottom minus an area where the combustion air elbow connects.

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    Do you happen to know the O ring Size is that is inside the Unit where the offset tubes goes and if there is a place to order them. "
    "two o rings in the exhaust line - one at the outside house connection tee and one inside the unit where the offset tube goes.

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    sources for O rings

    I have found McMaster -Carr to be very helpful.They are an industrial supplier of all sorts of obscure stuff.
    Monitor OEM parts are available from a guy whose business is called
    "All Around the House",Box 629,Glen Wild, NY (845)434-0212.
    Speak with John,or Irwin.I don't their web site address,so do a google search....nice folks.

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    "O" Rings

    Thank you very much fr the speedy reply !!!

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    Quote Originally Posted by IndnChief View Post
    I have found McMaster -Carr to be very helpful.They are an industrial supplier of all sorts of obscure stuff.
    Monitor OEM parts are available from a guy whose business is called
    "All Around the House",Box 629,Glen Wild, NY (845)434-0212.
    Speak with John,or Irwin.I don't their web site address,so do a google search....nice folks.
    ....Well,I'm having trouble with the Monitor 441 again.It just started shutting down.Intial startup sequence seems normal until the burner lights up,runs for a minute and a half,then stops,and the heater begins to cycle to shut down.Afetr my last cleaning,and replacement of the flame detector,all was fine.Now it acts as if the flame detector is not sensing the initial burner light up.Opening it up to have a look,I found slight sooting insde the burner bonnet,and similar sooting of the mineral glass window to the burner..my initial reason for opening it up.It seems unlikely that the flame detector rod/assembly is faulty...does anyone have any ideas as to what's causing the heater to shut down?..It definetly appears to be a safety device triggering the shut down.I've cleaned the fuel screen,replaced the filter,and there's plenty of fuel in the tank...

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    Monitor 40, any ideas?

    We have a Monitor 40 that is having a starting problem, if anyone has any ideas about it, we'd appreciate them.
    Here's the scoop:
    Basically, it is not completing the lighting process, it seems.
    When you turn it on, it starts running, seems to light, burner level jumps to mid way, after about three minutes it MIGHT go to full, then just stops, and everything starts flashing.
    We've changed the filter and used Diesel 9-1-1 in the tank (which is outside), we also had the line blown out with CO (or CO2).

    Any ideas?

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    Your first problem is using diesel fuel. Monitor suggests using ONLY K-1 dyed or undyed. NO biodesiel etc. Diesel fuel tends to gel in cold weather and additives that might work great with engines will NOT work with this type of heater.
    The typical burn cycle is thus: combustion air blower comes on to purge fumes from chamber. Ignition coil comes on. after about 300 seconds, fuel is pumped into chamber where it ignites. If the flame rod doesn't detect ionized gases between the burner head and chassis ground the unit goes into lockout. no fuel, no flame will lock you out.

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    Monitor 40 not working

    We are using Dyed K1 for fuel, the Diesel 9-1-1 is a dry gas type of additive that was suggested by our fuel supplier to remove any moisture in the tank.
    It sound like from your description that the fuel in coming in too slowly, is that possible?
    This has been happening for about three weeks now. Luckily there is a secondary heat source, but this one has the programmable thermostat so we'd like to get it up and running again.

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