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Old 12-05-2009, 08:28 AM   #15
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Why on earth would you want 30,000 btu to heat ~200 sq ft of living space. That's 2-1/2 tons of heating capacity.
It's better to have a little more, than not enough heat.

The replacement furnace's available, in this case, is very limited, unless the owner wants to do a ton of modifications.

Andy
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Old 12-05-2009, 05:40 PM   #16
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50% isn't a little more. Most trailer furnaces are already sized to bake your eyeballs out. Massive overkill makes it that much worse. We've got a 48k BTU (4 ton) heat pump that keeps an old 1961 vintage home with massive amounts of glass and cathedral ceilings warm down to 20 degrees before the auxiliary gas furnace kicks in.
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Old 12-05-2009, 07:36 PM   #17
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I installed a 20k btu Suburban furnace in my 24' Tradewind. It run about 10 minutes three times an hour when the outside temp is below freezing.

It keeps the trailer very warm and comfortable, although no furnace will keep the outside walls warm to the touch when it's 20 degrees outside.
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Old 12-07-2009, 07:50 AM   #18
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If the original furnace was 20 or 22,000 BTU's, I would go with the 19,000. The 30,000 is WAY too big, they are used to heat a 31' AS. The worst that would happen if it's below zero is the 19,000 BTU furnace would run a lot.
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Old 01-12-2010, 12:34 PM   #19
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From reading through this thread I'm wondering if I made a mistake. I purchased a new NT34SP from Forrest River (that's the company name on the invoice) to replace the original furnace in our '71 Safari, which I'm guessing is a NT20 or NT22. Suggestions?
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Old 01-12-2010, 12:42 PM   #20
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If you come to Minnesota you'll be glad you have it. Around the Atlanta area it's more than you need.
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Old 01-12-2010, 12:58 PM   #21
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From reading through this thread I'm wondering if I made a mistake. I purchased a new NT34SP from Forrest River (that's the company name on the invoice) to replace the original furnace in our '71 Safari, which I'm guessing is a NT20 or NT22. Suggestions?
You had a 20 or 22 thousand BTU furnace.

A very good upgrade would have been a 30,000 BTU furnace.

The 34,000 BTU is OK, but I think a little overkill, especially the additional cost.

Andy
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Old 01-12-2010, 01:38 PM   #22
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On my TW I replaced the NT22a with a NT30. No complaints. I was able to reconnect to the existing NT22a plenum and use the old duct work. It required a little bit of work to get it to fit but not too bad. There are past threads on the subject with excellent photos and instructions.
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Old 01-12-2010, 01:54 PM   #23
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Same as Lumatic, I put an NT30 in place of a NT22 and have no complaints about cycling, heat level, etc...You can see it here:

http://www.airforums.com/forums/f427...t22-60035.html

A 19K btu would probably also be fine. I have this crazy dream of one day towing my rig out to Colorado and doing some SKIING! and hey, who knows....

There are many good threads on this, if you scroll to the bottom of the one above you can find a couple more links..
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Old 01-12-2010, 02:22 PM   #24
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You had a 20 or 22 thousand BTU furnace.

A very good upgrade would have been a 30,000 BTU furnace.

The 34,000 BTU is OK, but I think a little overkill, especially the additional cost.

Andy
Thanks for the reply Andy. The NT34SP cost $345 including delivery. The NT34SP was about $25 (give or take) more than the NT30SP.
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Old 01-12-2010, 04:23 PM   #25
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You need a thermostat that you can adjust the anticipator. That keeps the temp more even.
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Old 01-12-2010, 11:58 PM   #26
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You need a thermostat that you can adjust the anticipator.
All that does is help to prevent overshoot. It does nothing to eliminate the short cycling that occurs with an oversized furnace. Your furnace heats up the heat exchanger to a certain temperature before it starts to blow air. Then it shuts off and the latent heat in the heat exchanger is mostly just lost. The more times per hour the furnace cycles the less efficient it is AND the less comfortable you are. You pay twice, more propane wasted and less even heat.
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Old 01-13-2010, 07:35 AM   #27
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All that does is help to prevent overshoot. It does nothing to eliminate the short cycling that occurs with an oversized furnace. Your furnace heats up the heat exchanger to a certain temperature before it starts to blow air. Then it shuts off and the latent heat in the heat exchanger is mostly just lost. The more times per hour the furnace cycles the less efficient it is AND the less comfortable you are. You pay twice, more propane wasted and less even heat.
When I changed out my NT22 to a NT 30 I had a problem with short cycling. I changed out to the cheapest Walmart thermostat I could find and it solved the problem. There was no anticipator in the OEM stat.
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Old 01-15-2010, 02:19 AM   #28
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The cheapest Walmart thermostat is better (for a while) than an old bi-metalic tstat that was malfunctioning; much like the cheapest Walmart tire is better than a 30 year old OEM tire that's leaking air. Better than not working is not a lofty goal. "Cheap" modern tstats are really pretty darn good. It's really not rocket science. Too cold, burn gas; too hot, stop burning gas. Doesn't affect the efficiency of the unit. 1500 watts is about 5k BTU. Most people will find a 1500 watt space heater sufficient in their trailer. I don't think anybody would seriously carry six 1500 watt space heaters around to heat their trailer. Really... that's how absurd it is! Place six electric space heaters around your trailer. Now, make it so that they all turn on full blast at the same time. If that's "comfort" then then you need a 30k BTU furnace.
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