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Old 06-03-2023, 03:00 PM   #1
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Carrier AC parts source

We removed the Carrier evaporators from our bus with the intention of installing them at a later point. Now is the time, and I'm looking for a source for some small parts like hose couplers and crimp rings.

Also does anyone know how much oil and r134a the system will need?

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Old 06-03-2023, 03:46 PM   #2
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CaddilacKid is the one you're gonna want to talk to. I believe he does re installs for those who've ripped out their factory air.
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Old 06-03-2023, 08:24 PM   #3
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Transartic seems to be a good knowledgebase for Carrier.. carrier got out of the Bus A/C busines a few years ago.. I was getting all my parts through ProAir LLC but they bought out a bunch of companies and the whole shebang went belly-up.. and darned if I didnt get the box of fittings and hose and controllers I ordered.. Grrrr.. luckily american express had my back on that one.. proair was nice because they were right in Elkhart indiana!



anyway coachbus parts has a good selection..



what kind of pieces are you looking for? im assuming you need to fit new hoses or splice them to re-fit the A/C units in new places?



a lot depends on what kind of Hose yours have. theres generally standard diameter Barrier hose that uses crimp ends (the fittings look like they have a big collar crimped on the hose with the fitting..



and then there is reduced barrier hose which uses "clip fittings".. those look like 2 rings with a crimp on each ring and a blue or red plastic "cage" ..



once we determine what you need we can go looking for it.. a lot of it is actually interchangeable from brand to brand. unless you need boards / controllers.. but compressors, lines, drain hose, even blower motors and expansion valves are pretty much standard parts..
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Old 06-03-2023, 08:50 PM   #4
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the amount of oil and refrigerant... there is often a placard someplace in the bus.. near the electronics of the A/C system where it has the original capacities written..



for the compressor I typically drain it dry and then charge it with the published charge.. a TM16 / sanden SD7 will use 5-6 oz of oil.. R134A systems typically came with PAG.. when I start brand new I use PoE as a preference simply because its in other systems my gauges and pumps touch..



if your comoressiors are the larger TM21s take 6 oz although ive heard of people using 7.. I like to run enough opil things stay lubed but not so much that the oil itself becomes a non. condensable hinderance to capacity..


EM-1 evaporator 2 oz, 2 fan condensor 2 oz, 3 fan condensor 3 ounces.. and thats generally enough for a full size bus.. or the lines are short.. ie front system on an FE bus with condenser near front ill go with 1 oz less overall..



O-rings.. id replace every O-ring on that system from compressor all the way back.. O-rings are typicall sold in AN-style numerical fittings.. every bus ive run across uses a mixture of #6,#8,#10,#12 O- rings.. carrier may not use a #6 unless theres a dash air.. but a good variety pack of A/C O-rings will do the job.. wet the ring with a little fresh oil before you screw the fitting together..



Vac-it-down!! dont skip this step!!

I take an automotive / bus system down to about 1000 microns.. while it may be possible to get one down further.. the O-rings and compressor seals are not designed to take negative pressure. so going really low with the vacuum pump often resultsi n it never getting there or you think you have leaks..



charge with 100 PSI of nitrogen is really the best way to leak test..



in busses used in northern climates, the condensers are the usual culprit for leaks.. road salt destroys them..



refrigerant.. hopefully theres a placard with capacity stamped, if not then charging on an 80 plus degree day ... engine at least 1500 RPM, good airflow under the bus (or on top if its roof mount condenser) till the sight glass is nearly clear.. I leave a slight few bubbles. ..


I have the wiring diagrams to the carrier EM-1 and EM-3 evaporators if you need them.
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Old 06-03-2023, 10:01 PM   #5
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The type I used---and then there is reduced barrier hose which uses "clip fittings".. those look like 2 rings with a crimp on each ring and a blue or red plastic "cage" ..


These folks were helpful and sell AC related stuff---also-- for what it is worth-- they carry radiators for buses.

https://www.apairinc.com/
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Old 06-04-2023, 08:06 AM   #6
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I love apair, gotten several sets of compressor brackets from them over the years.. they were great to work with..
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Old 06-04-2023, 08:20 AM   #7
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Quote:
Originally Posted by PorchDog View Post
The type I used---and then there is reduced barrier hose which uses "clip fittings".. those look like 2 rings with a crimp on each ring and a blue or red plastic "cage" ..


These folks were helpful and sell AC related stuff---also-- for what it is worth-- they carry radiators for buses.

https://www.apairinc.com/



I also used reduced barrier hose.. for the nay-sayers on those clip fittings.. I havent had a properly installed one leak yet.. the beauty of them is most brands you can swivel them even after crimping.. i used burgaflex which ProAir OEM'd. but its harder to get than EZ-Clip or aero-quip in the US..



the only time I use regular barrier hose is if the bus already has it and im just making a repair for someone.. but if I have to replace a whole line it gets reduced barrier.. its much easier to route as well.. I am not sure its as "tough" as regular diameter hose. as its much easier to cut. so might be more susceptible to rub-through.. my rule of thumb is to route it and hang it such it doesnt rub on things.. if it has to go through a metal part someplace then I typically wrap it with a length of heater hose i have slit.. seems to work good at protecting from rub-through..



im not dsure how it will be this summer but last summer A/C hose was in short supply.. not sure why.. I use the Good-year Galaxy 4890 reduced barrier hose and it was tough to get.. I bought a bunch of it and then ended up using every bit not sure if this summer is the same way or not..



I havent scheduled any A/C projects because my regular work load is at what could be classofoed as an Insane level.. not a bad problem to have. but no time for my own bus projects let slone lots of A/C stuff..
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