R134 TR conversion?

[SuperSix]

You can afford a suction pump.

http://www.harborfreight.com/automotive-motorcycle/refrigeration.html

Useless. I mean a real 120V beast. I threw away the old HF suction pump I had.

Been using one for about 10 years now and no issues yet. :supz:

I never had luck pulling a serious low vacuum for any amount of time - maybe it's my compressor.

[daveismissing]

1950s 1960s refigerator compressor, cast iron jobs.
They had fittings on both sides.

[Wrecked Em]

I am trying the HF suction pump. I have heard from several people that used it and it worked well. I have also heard some negatives. I'll give it a shot.

[SuperSix]

I am trying the HF suction pump. I have heard from several people that used it and it worked well. I have also heard some negatives. I'll give it a shot.

 think it depends on the CFM of your compressor. Mine's not that great.

I need to buy a nice compressor. I have a 10 year old oilless Craftsman 5HP 20gal.

[Wrecked Em]

I have an old Dayton 5hp with a 60 gallon tank. I have not had any probs running paint guns DAs or anything else. This pump should not be an issue.

My only concern is that it is rated at 28.3 inHg. Most reading recommend 500 microns vacuum (29.92 inHg). Hopefully that will be enough.

[SuperSix]

If I read to vacuum it down for an hour, I leave it on for 2. The main purpose is to boil off the moisture, so longer cant hurt.

[SuperSix]

I assume you are following the conversion guide from GN/TType.org that you linked?

The GN I just got had the A/C lines disconnected - I will probably get a new compressor dryer, etc. I need to find the info on the replacement condenser that works better with the R134.

Good thread - I am interested in your results.

I HAVE to have A/C - I plan on sound insulating/etc the GN. Make it fast AND plush.

[Wrecked Em]

If I read to vacuum it down for an hour, I leave it on for 2. The main purpose is to boil off the moisture, so longer cant hurt.

At 500 micron it is recommended to hold for 45 minutes, but the main reason for this is to boil the refrigerant out of the oil. Since the oil will be changed this will not be an issue.

I do not think the difference between 28.3 and 29.92 inHg will make much difference as far as moisture. A little more time should be ok as far as eliminating moisture.

[Charlief1]

I never had luck pulling a serious low vacuum for any amount of time - maybe it's my compressor.

I had some issues a couple of years ago with mine and after doing a little testing it turned out that my guages were bad. The pump I've got will pull and hold 29 inches as long as I want since I got the new guages. :supz:

[Wrecked Em]

So far i have installed the condensor, changed the orifice tube, installed the lines, and removed the compressor.

No major issues so far.

Now I am off to put the compressor back in, install the receiver/dryer, and start pulling a vacuum.

[Wrecked Em]

I assume you are following the conversion guide from GN/TType.org that you linked?

The GN I just got had the A/C lines disconnected - I will probably get a new compressor dryer, etc. I need to find the info on the replacement condenser that works better with the R134.

Good thread - I am interested in your results.

I HAVE to have A/C - I plan on sound insulating/etc the GN. Make it fast AND plush.

I am sort of following the gnttype procedure.

I have recently (Friday) become a certified Universal A/C tech and will be come a certified MVAC tech this week. So I am trying to do things the proper way even though certification info is vague as to the actual work, mostly specs and regulations.

[Wrecked Em]

So my compressor will not engage. The ECM is calling for it but I am not getting a signal to the compressor. I need to troubleshoot it, I will let you know what I find.

[daveismissing]

Cutoff switch on the compressor itself?

[SuperSix]

Does the ECM call for it after it receives the signal that the pressure is correct? Or before? Could i be a bad pressure sensor?

[Wrecked Em]

I am jumping out the switch. If the switch is not jumped out, it does not call.