| 45 degrees [message #86341] |
Thu, 27 May 2010 19:41  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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My roof AC which is a fairly new unit, never seemed to be all that cold. So today I stuck a thermometer in the plenum and ran it for about an hour.
The coldest it got, on low fan was 44.x degrees, it only gets warmer if I turn up the fan.
So, are they shot?
Or Is this as good as they get?
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: 45 degrees [message #86347 is a reply to message #86341] |
Thu, 27 May 2010 20:40  |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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The air temperature coming out of the vent (supply air) should be about 22 degrees colder then the air going into the filter(return air). It won't be near as cold as the dash air.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: 45 degrees [message #86353 is a reply to message #86347] |
Thu, 27 May 2010 21:38 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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So if the coach was at 78 degreesm it was actually doing well?
Wow, I'm unimpressed!
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: 45 degrees [message #86361 is a reply to message #86353] |
Thu, 27 May 2010 22:13 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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| Keith V wrote on Thu, 27 May 2010 19:38 |
So if the coach was at 78 degreesm it was actually doing well?
Wow, I'm unimpressed!
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It is not the temperature of the air which is important but the temp combined with the volume. The combination is what delivers the cooling Btu's that you are really interested in having. Also, the dryer the incoming air, the less energy goes into removing moisture and the colder the output air will be. As humidity of the incoming air goes up, the more of the energy output of the unit will be consumed drying out the air, and the higher the measured temperature will be.
In fact, air around 55 F is normal for most AC systems. Any colder and usually it is uncomfortable with drafts of cold air being felt. In general, we want a reasonable volume of air around 55 F to be comfortable, not a smaller blast of very cold air.
Rob Allen
former owner of '76 x-PB
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| Re: 45 degrees [message #86560 is a reply to message #86341] |
Sat, 29 May 2010 22:14 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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I checked mine today while working on the coach. Outside temp. was about 95, almost no humidity, inside temp of the coach was in the nineties as well. The thermometer read fifty degrees in the outlet. This is the original Duo-Therm front unit, on high cool. That is about a fourty degree difference. Again, NO humidity.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: 45 degrees [message #86736 is a reply to message #86560] |
Mon, 31 May 2010 19:10 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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Outside air versus inside air is another thing. This is effected greatly by how much and the quality of your insulation,the color of your coach (black or dark roof versus a white one), window tint. Most roof units or A/C units in general are designed for around 22 degrees difference of air entering the evaporator versus air leaving the evaporator. Yes high humidity air will have an effect also.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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