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air conditioning


 
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Mark Stintzi
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Joined: 27 Sep 2013
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PostPosted: Sat Jul 26, 2014 6:30 pm    Post subject: air conditioning Reply to specific post Reply with quote

I have a Case 1175 with a York compressor. I have put 134A in the system and get very little cooling. I just replaced the receiver dryer and evacuated the system as well. Is something else wrong or I was wondering if this system can in fact operate on 134A? Thank you.
 
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karl h
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PostPosted: Sat Jul 26, 2014 6:43 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

you should have no problem running 134. 134 by nature does not provide the same cooling that r12 did, but there is new synthetic 134 that claims to be colder. You want to make sure that you have closed off the coolant from going to the heater core , as this will decrease the A/C's cooling ability in the cab.
 
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timbernt
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PostPosted: Sat Jul 26, 2014 6:43 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

When I converted my 1070 to 134A I replaced the expansion valve and dryer. It still had problems and they continued until I replaced all the hoses. If you have the original hoses or a lot of splices you may be leaking Freon before it can work. When I finally changed the hose it has not failed in the last 20+ years. I am pretty sure your 1175 has the same components.
 
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karl h
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PostPosted: Sat Jul 26, 2014 7:24 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

another thought is that if the system is overfull it will actually not cool as effectively either, you need to make sure that you don"t overfill it.
 
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dwag
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PostPosted: Sat Jul 26, 2014 8:25 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

What"s the "new synthetic"?
 
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Brokengun
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PostPosted: Sat Jul 26, 2014 9:48 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

I hope you dont mind me asking these questions.

When the R134 gauge is hooked up to the compressor what are the readings on the gauge, high and low?

How many times a minute does the A/c clutch cycle?

Also please make sure the heater isnt on even just a little. It is operated by a wire and the wire can bend allowing the heater to be partially on
 
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mEl
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PostPosted: Sun Jul 27, 2014 4:31 am    Post subject: Re: air conditioning Reply to specific post Reply with quote

Mark Stintzi wrote:
(quoted from post at 19:30:31 07/26/14) I have a Case 1175 with a York compressor. I have put 134A in the system and get very little cooling. I just replaced the receiver dryer and evacuated the system as well. Is something else wrong or I was wondering if this system can in fact operate on 134A? Thank you.


I have successfully converted many, it is a must to remove the cab top and clean the evaperator core if not done already. I have had a few that the insulating foam from the cab top come unglued and hung down over the evaperator core mostly shutting off air flow and it will be mostly plugged shut if never serviced. The cooling will not be quite as good but more than adequate.

I just got a Email from Icor, a supplier of all types of refrigerant items and they have a direct replacement for 12 that is not a flammable blend with equal or better cooling. I have not tried any of it and since retirement do not intend to but you could check with the local mobile refrigeration repair centers to see if it is beiing used.
 
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Mark Stintzi
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PostPosted: Sun Jul 27, 2014 4:45 am    Post subject: Re: air conditioning Reply to specific post Reply with quote

Well I haven't checked if the heater might be on--I will do that today. I haven't checked the pressures on the high and low side. When I filled the system in the field I did so after I evacuated it-- my first evacuation of a system. I then filled it regularly with the replacement cans and hose and just filled it until the bubbles left the receiver dryer. This has always worked for me before, but who knows. And during my failed test the compressor stayed on, constantly. Thank you for all the advice. Mark
 
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VAC400
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PostPosted: Sun Jul 27, 2014 7:41 am    Post subject: Re: air conditioning Reply to specific post Reply with quote

Mark A couple of Questions. Did you flush the system? did you add the correct compressor oil.
You will find the high side will be much higher than R12. As I remember your Case dealer will have th correct amount to add to the system, I believe it will be more.
Jerry from Ohio
 
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karl h
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PostPosted: Sun Jul 27, 2014 9:06 am    Post subject: Re: air conditioning Reply to specific post Reply with quote

here is some for sale at auto zone ...it says up to 18% colder air than conventional 134
Untitled URL Link

 
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Mark Stintzi
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PostPosted: Sun Jul 27, 2014 1:41 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

No I didn't flush the system. I had replaced the seal on the compressor and checked the oil then. It was fine. I can see by all the answers these systems can have about 20 problems. I'm use to having just one--low refrigerant. Technically and time wise I can't do this job right at the moment. Thanks. Mark
 
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jrward
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PostPosted: Sun Jul 27, 2014 7:46 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

Hello,
I've been lurking for a long time but this is my first post. I just converted a 2590 from r12 to hc12a witch is an environmentally friendly coolant so you don't need a liscense to buy it and my tractor is now blowing 36deg. air on a 90deg day and runs about 20 percent lower pressure than r12. The cost is good too. I got mine from local farm repair guy and the 12 lb bottle (whitch equals 30 lbs r12) cost about $110.
 
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Bob
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PostPosted: Sun Jul 27, 2014 8:26 pm    Post subject: Re: air conditioning Reply to specific post Reply with quote

1. Are you aware it's essentially refined PROPANE, and FLAMMABLE?

2. In the US, it's use in mobile equipment is probably illegal?

3. You claim it's "environmentally friendly", yet the "venting" of it is ILLEGAL in many areas.
Safety and legal info

 
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Cas
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PostPosted: Mon Jul 28, 2014 11:39 am    Post subject: Re: air conditioning Reply to specific post Reply with quote

R-12 uses mineral oil and R-134 uses PAG oil. Something about molecule size and weight. Probably might cause problems in the future.
 
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mEl
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PostPosted: Tue Jul 29, 2014 4:52 am    Post subject: Re: air conditioning Reply to specific post Reply with quote



Rechecked the Icor site and the HC134 is definately not recommender for mobile applications.
 
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