I think you just did post it to the group :D Sounds like a good method (but what do I know). rick ---------- "Keith Cooper" <[EMAIL PROTECTED]> writes:
From: "Keith Cooper" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Subject: Re: Re:Re: Re:[Chevelle-List] Keith A/C Date: Thu, 13 Jun 2002 18:37:26 -0400 I am not going to convert mine to the orifice tube. I am keeping the expansion valve set-up. I will try to find out if you can convert it for you. Here are the instruction he gave me. Do you think that I should just post this on the group?? A/C Vacuum Down and Charging Instructions These are the "generic" instructions I made up. They vary from car to car, but you should be able to do yours with no problem. The POA system will keep the low side a constant 28 to 30PSI if operating properly...Hope this helps... To Pull A Vacuum: and Charge the system 1.. First hook up your gauges to both service ports. Open both "wheels" on the manifold set. Turn on the vacuum pump. If you have a ballast valve, open it. If not continue. 2.. Once the vacuum is pulled to 29.9 hg's, (Or as much as it will pull down. You will lose about 1 hg for every 1,000 feet above sealevel. This is normal.) Shut both wheels on the manifold gauges and wait five to ten minutes to see if the vacuum degrades. This to is normal as moisture boils off, and refrigerant boils from the oil left in the system. 3.. Repeat the pulling down of the vacuum again. Then wait again to see if it holds. You may have to repeat this a few times, depending on moisture, oil holding refrigerant etc. But once it holds for about ten minutes with no loss of vacuum, turn the pump on one last time with both wheels open for fifteen minutes to remove whatever boiled off. Then close both wheels gain. 4.. Hook up your tank or can. Open the valve and crack the fitting on the charging hose where it connects to the manifold set. This will purge the air out of the hose. Once done, tighten the fitting and open THE LOW SIDE WHEEL ONLY. The HIGH side is to remain closed for the remainder of charging. 5.. Let the vacuum pull in as much as it can, I charge liquid, but either way will work. Remember to purge the air out of the line each time you change cans. Make sure you close the "wheel" when you do this. 6.. Once the system has taken in as much as it can, then start the car and finish charging. There should be no need to jump any switches, as the system will have the static pressure needed to allow the switches to work. Charge to 2.2 times the ambient temp on the high side. This is where you now "adjust" your charge. Monitor the vent temps with a vent thermometer. Slowly add refrigerant allowing time for the system to stabilize. Check vent temps. Do this until you get your "best vent temps" and then stop. Try to keep your high side pressures between 2.2 and 2.5 time's ambient temp. If you have a condenser fan (Electric) make sure it is operating properly. If only an engine driven fan, it too must be operating properly or high head pressures will result. When charging is complete, close windows, lower fan setting and your vent temps will drop also. Charging should be done at around 1,500 Rpm's Windows Open AC on Max Fan on high speed. ----- Original Message ----- From: "rick schaefer" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, June 13, 2002 10:18 AM Subject: Re:Re: Re:[Chevelle-List] Keith A/C > Keith > Please send me a copy of the Vacumn instructions. Also what is the cost of the orifice tube conversion? Is it a "bolt-in" replacement for the expansion valve. > > rick > > ---------- "Bob" <[EMAIL PROTECTED]> writes: > > From: "Bob" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Subject: Re: Re:[Chevelle-List] Keith A/C > Date: Thu, 13 Jun 2002 06:47:13 -0400 > > Keith, > I would like a copy of the instructions as I am going to install all new > R34a conversion components from Old Air Products. The pump from Harbor > Freight is a venturi pump, works like a carb. Attach a LARGE capacity > compressor and the venturi effect creates the vacuum. I have one and it > works fine for the few cars I do. > Bob Walton > [EMAIL PROTECTED] > Maryland Chevelle Club > > ----- Original Message ----- > From: "Keith Cooper" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, June 13, 2002 6:14 AM > Subject: Re: Re:[Chevelle-List] Keith A/C > > > > Rick, > > Thanks!. I think that amount must be right. He told me that I would need > 11 > > oz of oil. He said add to compressor and put the rest in the > condenser,etc. > > So you must be right. On the expansion valve here is what was said: These > > types of valves, although efficient, have some disadvantages over orifice > > tube systems. Like orifice tubes these valves can become clogged with > > debris, but also have small moving parts that may stick and malfunction > due > > to corrosion. > > If anyone wants the vacuum down instructions he gave me, email me or I can > > post it on the list. His instructions were very detail and different from > > how I have vacuum down in the past. I have always put the vacuum unit on > the > > system for about two hours and then charged, but this is not how he > > instructed me. > > ON Harbor Freight Tools site, they have an Air Vacuum Pump which only > sells > > for $10.00. This seems too cheap. Electric units usually sell for > > 150.00-350.00. Here is the page on Harbor: > > http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=3952 > What > > do you guys think?? Is this junk?? What do I need to look for in a vacuum > > unit. I just want one good enough to do my cars only. I am not wanting to > go > > into the a/c business. > > > > ----- Original Message ----- > > From: "rick schaefer" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Thursday, June 13, 2002 1:34 AM > > Subject: Re:[Chevelle-List] Keith A/C > > > > > > > Keith info from a 72 Chevrolet Service Manual: > > > > > > Freon - 3 lbs 12 oz > > > oil - 11 oz > > > > > > These are for 72, but I'm sure 71 is extremely close. > > > > > > BTW - Standard conversion for R134a seems to be 80% of the R12 charge. > > So 60oz * .8 = 48 oz of R134a. > > > rick > > > > > > > > > rick schaefer > > > 72 El camino > > > http://members.home.net/jimmy4/rick1972elky.html > > > ACES #00140 > > > Team Chevelle #00038 > > > > > > > > > ----------------------------------------------------- > > > To Unsubscribe please visit www.chevelles.net/list.html > > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > > > > > > > > ----------------------------------------------------- > > To Unsubscribe please visit www.chevelles.net/list.html > > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED] > > > > rick schaefer > 72 El camino > http://members.home.net/jimmy4/rick1972elky.html > ACES #00140 > Team Chevelle #00038 > > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED] ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED] rick schaefer 72 El camino http://members.home.net/jimmy4/rick1972elky.html ACES #00140 Team Chevelle #00038 ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
