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Old 03-21-2019, 04:30 PM   #1
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Conversion A/C

Iím doing my research before taking on a conversion. I need some help with the A/C unit. I want to use the Carrier OTR system for both driving and while parked. Anyone know if I change the mechanical compressor to a 24 volt electric motor that would work OTR as well as when parked and on shore power. The electrical system will be a 24 volt victron so I should be able to run the electric motor with that for OTR purposes.

Has anyone heard of this being done or possible?

Thanks.
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Old 03-21-2019, 06:39 PM   #2
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Originally Posted by 5coates View Post
I’m doing my research before taking on a conversion. I need some help with the A/C unit. I want to use the Carrier OTR system for both driving and while parked. Anyone know if I change the mechanical compressor to a 24 volt electric motor that would work OTR as well as when parked and on shore power. The electrical system will be a 24 volt victron so I should be able to run the electric motor with that for OTR purposes.

Has anyone heard of this being done or possible?

Thanks.
You cannot change out the mechanical compressor to a electric motor, if your OTA compressor was driven off the main engine or a pony engine, it is possible to drive, [probably by belt] your compressor with an electric motor. Bear in mind, most OTA bus systems were massive because they were designed to cool 50 people. Some Prevost conversions retained the OTA bus systems, but do not know if they were changed to electric drive. On my 2 conversions, went to roof air only, for ac, and ran generator for power. Good luck, a lot of work ahead of you, but worth it in the end. [mostly]
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Old 05-30-2019, 05:06 PM   #3
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We've got the original OTR a/c unit on our bus, and it works great to cool the bus while driving. It's a huge system designed to overcome the load imposed by passengers and the sun baking things through the windows.



I'd never consider using it to cool while parked - the system is simply too large and not necessary. With curtains drawn and only a couple of people on board, a pair of basement a/c units keep things cool and don't draw much juice. Roof units would do the same.


Many recommend pulling the OTR system when doing a conversion, but if it's functional I'd leave it in place since nothing you can mount on the roof will keep things as comfortable going down the road.
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Old 02-12-2020, 08:58 PM   #4
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I actually discussed this with a bus shop foreman regarding my Setra, their facility used to run setras until vanhools were much cheaper to buy (he was sad to see the setras go) he said the biggest problem was the required 45pound plus of pressure needed to swap the compressor to an electric. I am still looking into the possible ways to do this, maybe an electric compressor, maybe a dual pully system and a pony motor, ....
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Old 02-12-2020, 09:14 PM   #5
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I actually discussed this with a bus shop foreman regarding my Setra, their facility used to run setras until vanhools were much cheaper to buy (he was sad to see the setras go) he said the biggest problem was the required 45pound plus of pressure needed to swap the compressor to an electric. I am still looking into the possible ways to do this, maybe an electric compressor, maybe a dual pully system and a pony motor, ....
Please explain what the 45 pound plus of pressure needed to swap the compressor to electric?
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Old 02-13-2020, 08:33 AM   #6
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OTR AC Unit

according to the shop foreman - to replace the mechanical a/c compressor an electric a/c compressor would need to be able to develop 45 psi for the system.
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Old 02-13-2020, 11:16 AM   #7
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according to the shop foreman - to replace the mechanical a/c compressor an electric a/c compressor would need to be able to develop 45 psi for the system.
45 psi suction pressure? 45 psi discharge pressure? Still don't know what that means.You will have to supply an electric driven compressor with the same characteristics as your current engine driven compressor. Your original OTR system is probably 50000 btu's or more, so you are looking at least a 15 hp electric drive motor requiring 40+ amps at 220 volts, as well as the power required to run your blowers and condenser fans. Guess it could be done, but in my view, would be a lot cheaper and easier just to add 2 or 3 roof units or a mini split system, and just use you OTR system running down the road or scrap it completely and blank off your engine ac compressor PTO.
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