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Topic: Filling dash AC system (Read 3270 times) previous topic - next topic

Re: Filling dash AC system

Reply #25
You can get compressor oil in pressurize cans.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Filling dash AC system

Reply #26
Proper measurement of evacuation of an AC system requires a Micron gauge.  A standard set of AC gauges is not sensitive enough to measure success. Micron gauges usually start at 20,000  and measure down to 200.  ASHRAE recommends evacuation to below 1000 microns for moisture removal and below 500 microns after replacing a compressor. Some equipment manufacturers call for evacuation to 400 microns to ensure that harmful water vapor is removed from the system. Asking how long you should evacuate the system is like asking how low it takes to pump the water out of your basement. That depends on how big the basement is and how much water is in it.

Incomplete evacuation causes sub-optimum performance and premature system failures. There are plenty of examples cited where proper methods were not used and yet the system ran mostly well for some years, just like there are plenty of people who run 15 year old tires on their RVs. However, That doesn't mean old tires are the standard.  I could go into  the physics about this but most peoples eyes glaze over when I start...... LOL!

There is more than enough info on the internet that is certainly wrong on this subject. The paper cited from Sanden  is simply wrong on evacuation. I am sure they know what they are speaking about CONCERNING THEIR PRODUCT but should have consulted someone else on evacuation.

If you are going to do your own work, buy a micron gauge and use it.

TOM
SOB (Some Other Brand) division
1995 Wanderlodge WB40
8V92 :D

Re: Filling dash AC system

Reply #27
Rick-  Just my $.02 FWIW

Buy another receiver/drier and log the experience as another "lesson learned".  Evacuating your questionable drier does nothing; baking it does little to renew it either.

When you evacuate your system for recharge you may want to do what the "better" shops do; namely, use the "triple evacuation" method.  Even with my 2-stage pump with 75 micron capability, I used this method.  It was what I told my DIYer friends to do ..... especially when they were (often) using a rented vacuum pump.

1.  Evacuate the system
2.  Break the vacuum to approx 1 atm with refrigerant
3.  Repeat (1) and (2)
4.  Evacuate the system again and charge to specs.

Good luck on the fix, and safe travels to ya.

Ed Sievers,
Rinky-dink SOB owner
Denver, CO
Ed Sievers
"Be the person you needed when you were younger"

Re: Filling dash AC system

Reply #28
Rick-  Just my $.02 FWIW

Buy another receiver/drier and log the experience as another "lesson learned".  Evacuating your questionable drier does nothing; baking it does little to renew it either.

When you evacuate your system for recharge you may want to do what the "better" shops do; namely, use the "triple evacuation" method.  Even with my 2-stage pump with 75 micron capability, I used this method.  It was what I told my DIYer friends to do ..... especially when they were (often) using a rented vacuum pump.

1.  Evacuate the system
2.  Break the vacuum to approx 1 atm with refrigerant
3.  Repeat (1) and (2)
4.  Evacuate the system again and charge to specs.

Good luck on the fix, and safe travels to ya.

Ed Sievers,
Rinky-dink SOB owner
Denver, CO

X2
Ive tried baking desiccant and leaving in a good vacuum and my results were never to my expectations .

Re: Filling dash AC system

Reply #29
Ed and Scott I ordered a new  dryer it was only $40 will be here in a couple of days it was a inexpensive lesson and cheaper then contaminating the new Freon and running into trouble I look at it this way by trying to do the work myself Im saving big dollars than having some shop do and in joying it the cost of replacing the condenser assembly and hose It was rusted all the bolts pretty well broke had too  re-drill all the holes thanks  for all the Advise everyone . It was a good thing that I asked these questions and it was pointed out There a lot of experience on this form  and everyone has a good point  hope to run into all of use on this forum love hearing all the knowledge and advice
Rick & Hilda looking forward to full- timing one day for now couple of months at a time
1999 U270 3602
Built number  5530.  Feb 1999            Motorcade  number 18438
8.3 Cummins Allison six speed with brake  retarder
Purchased Nov 28 2019

Re: Filling dash AC system

Reply #30
Ed and Scott I ordered a new  dryer it was only $40 will be here in a couple of days it was a inexpensive lesson and cheaper then contaminating the new Freon and running into trouble I look at it this way by trying to do the work myself Im saving big dollars than having some shop do and in joying it the cost of replacing the condenser assembly and hose It was rusted all the bolts pretty well broke had too  re-drill all the holes thanks  for all the Advise everyone . It was a good thing that I asked these questions and it was pointed out There a lot of experience on this form  and everyone has a good point  hope to run into all of use on this forum love hearing all the knowledge and advice

Where did you get the condenser? Mine appears to be leaking and is on my short list of repairs.


Keith
The selected media item is not currently available.Keith & Jo
2003 U320T 4025 PBBS Designer series
Build 6203    Cummins 500hp
2000 U320 4010 WTFE / Build 5762 —Sold—
Motorcade #18070   
Pasadena, Texas
2015 Jeep Wrangler Sahara-Sunset Orange pearl coat
Don't argue with a fool, people watching might not be able to tell the difference.

Re: Filling dash AC system

Reply #31
Where did you get the condenser? Mine appears to be leaking and is on my short list of repairs.


Keith
Hi Keith I order it from Brad LangFord  parts manager 936 564 8367 ext 173 at Foretravel Texas it was a complete assembly condenser electric fan and dryer all in one unit I believe it was around $650.00 not sure would have to check bill of sale  best way is to email him partsvendors.texas@foretravel.com he'll give you a quote he's very good at getting back to just give him time just give him all the information on coach and what you need
I am not home today when I get home I can look up the bill of sale for the part number
Rick

Rick & Hilda looking forward to full- timing one day for now couple of months at a time
1999 U270 3602
Built number  5530.  Feb 1999            Motorcade  number 18438
8.3 Cummins Allison six speed with brake  retarder
Purchased Nov 28 2019