etu Posted May 27, 2015 Report Share Posted May 27, 2015 We have a 2004 Keystone Challenger 5er in great condition. It has a Carrier Air V which works fine but I know Carrier does not make this ac today. So if some component goes out in the ac I know I'll probably have to replace the unit. The model I have the blower runs continuously while the compressor cycles on/off to maintain cool setting. We have a ducted system and the airflow to the bedroom over the 5th wheel is just only adequate. It does seem to get cooler in the main room even after balancing air registers to the best I can. How do you know if the AC unit is performing as well as it should? Can I assume since the compressor cycles and cools ok that it is really ok or is there a better way to measure efficiency? Do newer units have more airflow and do the fans cycle on/off once cool setting is obtained? Link to comment Share on other sites More sharing options...
warroland Posted May 27, 2015 Report Share Posted May 27, 2015 I had a 2004 Keystone Challenger and the fan on the A/C cycled with the compressor- fan on for short time, compressor on, temp satisfied, compressor off, fan run a little then off. I added a second A/C in bedroom to keep it cool. I don't think one A/C will keep RV cool in hot weather. Alabama/Tennessee Campers On Mission 2002 Fleetwood Revolution 38B2006 Honda CR-V, Air Force One, Blue OX tow bar Link to comment Share on other sites More sharing options...
Kirk W Posted May 27, 2015 Report Share Posted May 27, 2015 How do you know if the AC unit is performing as well as it should? Can I assume since the compressor cycles and cools ok that it is really ok or is there a better way to measure efficiency? Using a dial thermometer, measure first the air temperature at the inlet to the a/c unit, preferably just outside of the place that air is drawn into the cooling coils. Allow the thermometer to stay in place for several minutes to be sure that it has stabilized and then note the reading. Next, using that same thermometer, place it into the discharge of the cooling coils, near the discharge where the cool air enters the ducts, rather than at the discharge from the ducts into the space as there will be heat gain as the air travels through the ducts. The temperature of that air should drop by at least 18° in passing through the coils and the ideal change is 22-24°. Anything more than that and the coils are in danger of freezing up and less means that it has begun to loose cooling capacity. That loss of cooling could mean anything from loss of refrigerant to degrading of the compressor. Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
nana25k Posted May 27, 2015 Report Share Posted May 27, 2015 Or the AC may just not be big enough for your RV. Our previous 5th wheel 32ft had a 15,500 unit that would freeze you out. A small 13k would have handled the front Do you have the fan on auto? If so it should cycle on and off with the unit. If you have it set on high or low it will run continuously Ron & LindaClass of 20072000 Monaco Diplomat 2005 Honda Element"Do what you can, with what you have, where you are" Theodore Roosevelt"We can't control the wind, but we can adjust our sail""When man gave up his freedom to roam the earth, he gave up his soul for a conditioned ego that is bound by time and the fear of losing its attachments." Link to comment Share on other sites More sharing options...
etu Posted May 27, 2015 Author Report Share Posted May 27, 2015 Thanks Kirk. Ill do these tests. Waroland you had a carrier with a later serial number than mine. They made the update (like yours) during the 2004 year. Did the ac unit you put in your bedroom install in the existing roof vent in that room? Link to comment Share on other sites More sharing options...
richfaa Posted May 27, 2015 Report Share Posted May 27, 2015 What Kirk said. Helen and I are long timers ..08 F-350 Ford,LB,CC,6.4L,4X4, Dually,4:10 diff dragging around a 2013 Montana 3402 Big Sky SKP 100137. North Ridgeville, Ohio in the summer, sort of and where ever it is warm in the winter. Link to comment Share on other sites More sharing options...
GlennWest Posted May 27, 2015 Report Share Posted May 27, 2015 Our living room unit cooled well. It pulled condensate in thru the vents though. Seems it could be fixed but after about 6 months of different shops, Dometic help, my help we replaced it. The newer unit has better air flow but is louder. Actually seems to cool better likely due to increases air flow. 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
warroland Posted May 28, 2015 Report Share Posted May 28, 2015 Thanks Kirk. Ill do these tests. Waroland you had a carrier with a later serial number than mine. They made the update (like yours) during the 2004 year. Did the ac unit you put in your bedroom install in the existing roof vent in that room? Yes and the power was already in place. It was a stand alone unit with built-in thermostat. Alabama/Tennessee Campers On Mission 2002 Fleetwood Revolution 38B2006 Honda CR-V, Air Force One, Blue OX tow bar Link to comment Share on other sites More sharing options...
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