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  1. #1
    Join Date
    Oct 2001
    Posts
    6,965

    Honeywell Hi Limit location

    won't this location fatigue the heat exchanger in not reading the actual heat exchanger chamber,and make the fan on/off cycle act wierd...
    "when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY

  2. #2
    Join Date
    Apr 2001
    Location
    Western PA
    Posts
    1,801
    What do the installation instructions say?

    I see them like that all the time, I think it was right. How long do you want the old beast to last, anyway?
    Jason

  3. #3
    Join Date
    Feb 2012
    Location
    Virginia
    Posts
    34
    Not the ideal location, but it would at least provide some safety protection from overheating, as long as the temperature isn't set too high. I wouldn't worry too much about any strain put on that old heat exchanger. Im sure its built like a tank.

  4. #4
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    that's a standard location from a time gone by

    how long is the insertion?

    short-not so good
    12"-14" good
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  5. #5
    Join Date
    Jul 2004
    Location
    Massachusetts
    Posts
    6,837
    For those of you new to the industry, old furnaces like that shown had no location on the actual furnace proper for a high limit. The HE's were built with plenty of heavy gauge steel and it was assumed that heated air rises and therefore the plenum was the most logical place to put the fan and limit control. For those of us who use to run into some manufacturers who used kixon switches for fan/limit controls, a quick change to a Honeywell L4064B was a good fix to get the heat going. Never saw a HE fail as a result of one of those installs. Now the gas furnaces of today...are a different story entirely.
    If YOU want change, YOU have to first change.

    If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!

  6. #6
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    4,991
    Those beasts were built from old recycled tiger tanks anyways.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  7. #7
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,087
    Great Uncle Vic had a Cleveland Torrid Heat lowboy with a conversion burner. When A/C was added, the fan limit ended up above the A coil. As I recall, the original 1940s control was replaced with a L4064 at some point. But that old relic would get SO hot before the heat would reach the control and the fan came on I worried about fire. That was before I was in the industry. Guess it was OK, never had any fires!

    That is a neat old machine BTW.

  8. #8
    Join Date
    Dec 2011
    Location
    bedford ind
    Posts
    1,088
    I just replaced a torid heat. Kept the name plate.

  9. #9
    Join Date
    Feb 2004
    Posts
    2,458
    Most of those old units used a "Minneapolis Honeywell Mercoid" fan/limit if memory serves me.

  10. #10
    Join Date
    Oct 2001
    Posts
    6,965
    thanks for the feedback saw some like this back in my residential days 100yrs ago.more that it was depending on the heat rising into the plenium to make the fan and the dial bounces up a bit towards 200F limit and could actually knock the gas burner off with that blast of heat build up
    "when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY

  11. #11
    Join Date
    Apr 2001
    Location
    Western PA
    Posts
    1,801
    The first furnace I ever replaced on my own was my Grandmother's 185,000 btuh Crane lowboy. 12 years ago, my first few months in this trade, I tackled everything, whether I could really do it or not. That old beast just about killed me! I think my back has been sore ever since.

    The long warmup period before the fan came on let gravity begin to circulate the air and warm the ducts. When the fan came on, Bam!, warm air. Grandma sat in front of a supply vent, drinking tea, reading the Sun, loving that hot air. When I did her a favor and gave her a new furnace, the *****ing began, and only stopped when she was carried out of that house. The 90% Rheem blows cold air, compared to the old Crane.

    I still see a bunch of old lowboys, brands like Williamson and Moncreif. I also see too many gravity furnaces, talk about hot supply air!
    Jason

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