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A/C Cooling Question Follow Up

Yahoo Message Number: 79728
Hi - Posted below the dotted line is my initial note. I did promise to look into this further and post a follow up. Here's what I found. First here are some
pictures:

http://muniac.smugmug.com/photos/swfpopup.mg?AlbumID=23265761&AlbumKey=3K4QbS Not pretty and luckily the manufacture put the electrical components inside a metal box. Of course their parts list wasn't accurate on the values regarding the motor start and run capacitors. In fact they mention only 2 capacitors and there are clearly three. I gather the burned part marked "PTCR" in the diagram is some sort of current sensitive solid state switch that cuts out the start capacitor after the compressor motor reaches its speed. It's burned beyond recognition. Anyway that's the story and those out there might want to inspect their A/C units if they are like mine. I haven't yet looked at the rear unit but will do so soon. My next step is to contact RV Products and make them aware of this problem. I hope to also score the replacement parts which won't really fix the problem just delay the next repair cycle.

Once I effect repairs, I'll restart the A/C unit and take a temperature measurement. For now we are OK running off the back unit during the day as needed. At night we still need some heat.

Hi,

My bus has two A/C rooftop units (they function as heat pumps too) @ 15,000 BTUs each. They are both RV Products model 9024-876. The front unit doesn't cool quite as well as the back unit does. I was up on the roof yesterday and took off the cover to the evaporator coil and cleaned only a small amount of dust from it. Also perked up all the aluminum tape to ensure no air leaks were diluting the cool air. Everything else looked fine visually. I keep the units covered in the winter months so the guts are pretty clean. My cleaning and taping efforts failed to facilitate any improvements. I measured the exhaust air temperature of the back unit @ 40F and the front unit @ 52F. Outside air temps were 80F at the time I took measurements.

Has anyone else had a weak cooling problem? If so, what steps were taken to correct the problem. I'm thinking the front unit needs to be recharged perhaps. It's been like this for about 4 years and hasn't gotten any worse. Help, advice, suggestions much appreciated. Thanks.

Best - Scott

2006 Allure 430 #31349
(Bus-Stead Lemon)