AC question

[Texasmark]

That plug is most likely for a low pressure switch. You are doing a great job of working this problem. You will find a solution no doubt!

Yes the low pressure switch has a (tractor wiring harness)connector that mates to the Rx dryer.

 

[5030]

Here's more info on TXV block valves. Keep us posted, Cougsfan.

Regarding ammonia, recall that liquid anhydrous ammonia is dumped all over farm fields as fertilizer with no mass casualties.

Regarding propane, recall that commercial propane is used for heating all over rural lands, with only the occasional mass casualty. It is transported by road, rail, pipeline, sea, and even air.

Both must be in the millions of tons per year, handled routinely and, for the most part, safely.

View attachment 664976

Entirely false. AN is an inhalation hazard causing death and it has to be incorporated (as in knifed in below the ground surface). it is not 'spread' like granular fertilizer. IOW, you get as good whiff of AN, you are toast.

 

[bernardcuziillo]

A small clarification: Comparing the 2014 manual, K25W-201406, to the 2015 manual, K25W-201504, the receiver dryer vanished. I've attached the system diagram pages for the two manuals, and the links to the full manuals, with thanks to Asteral of Caddo Mills, TX.

View attachment Page from TIER 4 20 SERIES.pdf
View attachment Page from Branson 20 series service manual.pdf

TIER 4 2 SERIES.pdf - Google Drive - Tier 4 20 series

https://drive.google.com/file/d/1Y1u...ew?usp=sharing - 20 series

 

[LouNY]

Thats some good information,
but talk about a short sited revision, deleting a receiver dryer doesn't sound like the best procedure to me.
It would certainly reduce the abount of needed refrigerant also.
I would wonder about the advisability of retro fitting a receiver dryer, personally I would be very tempted to.

 

[bernardcuziillo]

Entirely false.

1. Please don't flame.
2. Please stay on topic. This is Cougsfan's AC troubleshooting thread.
3. Instead of "dumped all over," I should have written "injected 6-8 inches deep in"
4. As others have mentioned, AH "has a built-in safety factor - you can't stand to breathe it. No one can voluntarily remain in a concentration of anhydrous ammonia gas strong enough to damage the nose, throat, lungs, eyes or skin. When people receive burns or eye damage from the product, it is because of a sudden release of it where the victim is unprotected and cannot escape."

 

[Cougsfan]

Update.... My tractor AC works! For now. I tried holding a vacuum on the system over night. The system went to around 28"hg immediately. I shut the pump off and came back about 6 hrs later and it had dropped to around 18 or 19". I turned the pump back on and left it until this morning and it had dropped to about 25". I pulled an absolute vacuum again and recharged the system. We filled it to 21 psi on the low side and 230 psi on the high side. We ran the tractor for 15 minutes and the pressures held steady. The air out of the evaporator fell to 49F. So we disconnected the gauges and called it good. Then the amazing thing happened. The hose on the high pressure end gauge had an appreciable amount of water in it! I would guess about 2 tablespoon full ran out.

That is a LOT of water in a small AC system. I am not sure why the water came to reside in the high pressure gauge hose, haven't figured that out. But I am glad it went there as opposed to my system.

So what has been happening is that the water in the system has been accumulating and freezing in the condenser, blocking all flow. Pulling a vacuum for a couple hours is not long enough to evacuate that much moisture. It took doing it all night to get it done. I am amazed there was that much water in there. The system has always had freon in it and has never been left open longer than brief periods of time.

Not having a receiver dryer certainly is a problem. It is also why the system only takes about half as much freon as the book says. From some of the things Bernard posted, Branson may have indeed made a few tractors without receiver/dryers, That is unfathomable! I plan to go back to Branson and insist my tractor be retrofitted with one. I cannot see the system working long term without one.

By the way, it does have a low pressure switch somewhere, because the compressor wouldn't engage until we put enough freon in it.

 

[K5lwq]

Great Job Cougs! I was thinking probably the water was introduced when you used compressed air to flush the system. Probably if you had chased that with some nitrogen it would have dried the system.

I did not pay attention before this thread but my 4815C does not have a dryer or accumulator. At least I know now to take extra care if I have to open it up for some reason. Thanks for sharing your experience!

 

[5030]

1. Please don't flame.
2. Please stay on topic. This is Cougsfan's AC troubleshooting thread.
3. Instead of "dumped all over," I should have written "injected 6-8 inches deep in"
4. As others have mentioned, AH "has a built-in safety factor - you can't stand to breathe it. No one can voluntarily remain in a concentration of anhydrous ammonia gas strong enough to damage the nose, throat, lungs, eyes or skin. When people receive burns or eye damage from the product, it is because of a sudden release of it where the victim is unprotected and cannot escape."

You posted it not I and I rebutted your comment because you don't know crap from applebutter obviously. Stick to what you know and leave the other stuff alone.

Not his thread. Tt's a public forum and as such I can comment on any thread I want to....and I did, I rebutted your false comment.

 

[5030]

One comment I will make concerning his no repaired dilemma and that is, in post 33 with the view of the roof mount ac components, there is a substantial amount of dirt and chaff on the blower housings and as such, I suspect there is also quite a bit under the evap / heater core cover as well on both HX's and that will reduced the efficiency of them in both heat and cool modes.

Just went through that with my Kubota M9 cab tractor and had to disassemble the housing and clean them both. Made a huge difference in cooling and heating efficiency. Just a little FYI because no matter how good a system works, a clogged with dust and crap HX will degrade efficiency and eventually lead to a frost issue because the HX cannot transfer the cool to the warm air coming in.

 

[LouNY]

Update.... My tractor AC works! For now. I tried holding a vacuum on the system over night. The system went to around 28"hg immediately. I shut the pump off and came back about 6 hrs later and it had dropped to around 18 or 19". I turned the pump back on and left it until this morning and it had dropped to about 25". I pulled an absolute vacuum again and recharged the system. We filled it to 21 psi on the low side and 230 psi on the high side. We ran the tractor for 15 minutes and the pressures held steady. The air out of the evaporator fell to 49F. So we disconnected the gauges and called it good. Then the amazing thing happened. The hose on the high pressure end gauge had an appreciable amount of water in it! I would guess about 2 tablespoon full ran out.

That is a LOT of water in a small AC system. I am not sure why the water came to reside in the high pressure gauge hose, haven't figured that out. But I am glad it went there as opposed to my system.

So what has been happening is that the water in the system has been accumulating and freezing in the condenser, blocking all flow. Pulling a vacuum for a couple hours is not long enough to evacuate that much moisture. It took doing it all night to get it done. I am amazed there was that much water in there. The system has always had freon in it and has never been left open longer than brief periods of time.

Not having a receiver dryer certainly is a problem. It is also why the system only takes about half as much freon as the book says. From some of the things Bernard posted, Branson may have indeed made a few tractors without receiver/dryers, That is unfathomable! I plan to go back to Branson and insist my tractor be retrofitted with one. I cannot see the system working long term without one.

By the way, it does have a low pressure switch somewhere, because the compressor wouldn't engage until we put enough freon in it.

Good to hear it's back up and working, that much moisture and no receiver dryer is certainly not a good situation.