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    Whoa, the AMOT valve is big (1-1/2" is smallest...

    Whoa, the AMOT valve is big (1-1/2" is smallest size), I'm plumbing the panel with 3/4". Most of the snow-melt panels I've see tend to use a Danfoss VRG 3-way mixing valve with a ARA663 motor...
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    I was trying to avoid a motorized 3-way mixing...

    I was trying to avoid a motorized 3-way mixing valve due to the expense (~$350-$375) and instead use the variable speed temperature sensing circulators. I admit though, I hadn't considered -10F...
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    It's a pretty small system. The boiler has a .75...

    It's a pretty small system. The boiler has a .75 GPH nozzle so if the boiler runs for 10 hours strait that's 7.5 gallons of oil at ~$2 per gallon = $15 per snow. About the same as paying someone to...
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    Snow melt system design

    Just thought I'd toss this out into the community and see if anyone had any comments for changes or errors in my plan.

    I've got a sidewalk with a bit less than 300 feet of 1/2" PEX installed in...
  5. Very good information. Thanks!

    Very good information.

    Thanks!
  6. I didn't make my problem very clear. My fault....

    I didn't make my problem very clear. My fault.
    One of the hot air units with an AF burner is the older type (no oil valve) I just had to replace the transformer and the new spare I had was the...
  7. Recommendation for upgrading Beckett AF/AFG?

    Wasn't quite sure where to put this so I'll try here.

    We have eight oil furnaces, some are hydronic some are air. There are both AF and AFG burners of different generations as well as burners...
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    Thanks to all for the bit of education. I didn't...

    Thanks to all for the bit of education. I didn't provide all the pertinent information at the beginning of the thread because at the time I didn't know it was relevant. But now I do. The operation of...
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    So, in other words the fan would be slowed down ...

    So, in other words the fan would be slowed down to reduce or stop the cycling and thereby keeping the heat exchanger hot and less likely to condense the flu gases?
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    Ok, Thanks for the reply. It just seemed odd that...

    Ok, Thanks for the reply. It just seemed odd that the fan was shutting off. Interesting about the condensing flu gas. The owner said he has to replace the flu pipes every other year. I guess the...
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    Warm Air Lowboy operation seems odd to me..

    I was in a small greenhouse the other day that had a warm air lowboy oil fired furnace. When it fired up the oil burner lit and started warming the heat exchanger as I'm used to seeing in residential...
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    Ok

    Thanks again!
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    Thanks all... a few more questions.

    Thanks for all the input! I'll check with local HVAC guys about outdoor reset and outdoor air.
    Could you elaborate a bit about what you mean by "Cold fired" and "clog it up" (soot?), and why...
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    Need help reducing oil consumption.

    Hi, I’m new to the forum and have a couple of questions about reducing the oil consumption of a Peerless boiler that’s about 5 years old. The boiler is a 150,000 BTU unit currently running a 1.25...
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