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G-MAN
04-19-2002 17:23:20
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Re: Re: Re: 6030 AIR CONDITIONING in reply to LANDON, 04-19-2002 10:37:23
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Landon, more than likely your system has been converted to R134-A refrigerant, which is more environmentally friendly than the R-12 it replaced. We convert a lot of older tractors (30 series on up" to R134. My experience with these conversions has varied widely. I've seen some systems cool very well, while others are just adequate. I have yet to see a converted system cool as well as an R-12 system in good condition. I think it's just the nature of the beast. We usually just change the expansion valve, receiver-drier; flush out the lines with alchohol and replace the compressor if needed and we don't usually have any trouble. We have been using the UV refrigerant (for leak testing) a lot lately as it makes finding leaks a lot easier. Clooney is right about running the system on recirculation to get colder air. I don't know how a 6030 system is set up for sure, but if the air doesn't seem cold enough, check the air duct temp at which the compressor turns off - sometimes the thermostatic switch can be adjusted down some to give a little colder evaporator temb before kicking the compressor off. Don't go below 32 degrees though, as this can lead to ice forming on the evaporator and a total loss of cooling. Air duct temps vary greatly with differences in systems, system charge, ambient temp, condensor and evaporator airflow, humidity, etc. If you get about at least a 30 degree drop from ambient temp, you're probably doing okay. That's about what I shoot for, although cooler is always better. I once saw a R134 system in a Cat 613C scraper cool to 19 degrees at the air duct at 80 degree ambient temp, but that is definitely the exception, not the rule.
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