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Old 06-19-2007, 12:00 PM   #15
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Thank you for the information...and just to let you know...my husband just bought one today..so it is good to know that you think they are fantastic.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by robertsonthego:
Fantastic fans are exactly that, fantastic. They run on 12 volts, certain models can either pull air into the trailer or blow air out, some are thermostatically controlled and some have a rain sensor that will shut the lid if it starts raining. I would highly recommend one!!!!! No I don't work for them. JR </div></BLOCKQUOTE>

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Old 07-09-2007, 09:34 AM   #16
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buckeyes, what brand of a/c did you go to? I am looking at changing to a Carrier 15k ducted unit to replace the Dometic 15k ducted unit that has stopped cooling. Regards

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Old 07-22-2007, 01:51 AM   #17
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I am surprised that you folks are having/had problems with A/C cooling properly. I have an older(85) 35' coachmen 5th wheel and A/c cools unit quite well. It is same cooling unit that came with trailer. We go to Texas and Ariz. so it does get warm. If we are away on a hot when we return and turn unit on it will take awhile to get down to temp but I think that would be expected. Have just the one cooling unit. Have to think,as others have suggested,that cool air is escaping from unit to other areas.
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Old 07-25-2007, 02:05 AM   #18
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It could be the changes in EPA regs different coolants being used. I think the 13K units are marginal at best in any unit now.
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Old 07-25-2007, 05:00 AM   #19
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Miles:
It could be the changes in EPA regs different coolants being used. I think the 13K units are marginal at best in any unit now. </div></BLOCKQUOTE>

The units still produce the same capacity....13,500 BTUH is still 13,500 BTUH. Back when people were converting, from R-12 to R-134a, you did see some loss of capacity due to the inefficient design for the newer refrigerant.

Roof top units are still R-22 for now. Manufacturers have tightened the margins of error on the units and build them to produce the capacity as noted and no more. I believe the unit are certified to ARI standards, so they have to make the rated capacity at the rated conditions within +/- 5%. Since this is a competitive market, they are going to push them toward the -5% side as it will save some money n the manufacturing process.

I do know for a fact that some manufacturers design and submit for ratings and then they catalog a rating that is +3% over actual. This still leaves them a margin of 2% error and still meets specs. The 5% number has been around a long time and I feel it should be tightened up a bit since we are capable of rating and designing to a much tighter tolerance.

So your 13,500 BTUH could actually be as low as 12,825 BTUH and still meet the rating requirements. Much like the truck tow ratings, it is a numbers game for the A/C market.

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