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Duracool, what should pressures be? [message #207168]

Wed, 08 May 2013 14:20

Oldngray

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Registered: August 2009
Location: Punta Gorda Florida

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I have heard 20,25 and 30#, my unit cools for about 5 minutes and then blows warm, suspect low pressure.
What pressure should it be?

Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015

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Re: [GMCnet] Duracool, what should pressures be? [message #207172 is a reply to message #207168]

Wed, 08 May 2013 15:04

emerystora

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Registered: January 2004

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I have always recommended 20 psi at 1500 rpm. The strange thing about Duracool is that a low pressure will give more cooling but if too low it will freeze up you evaporator with condensed water vapor. Too much will give higher temperatures.

Emery Stiora

On May 8, 2013, at 1:20 PM, Richard MacDonald wrote:

>
>
> I have heard 20,25 and 30#, my unit cools for about 5 minutes and then blows warm, suspect low pressure.
> What pressure should it be?
>
> --
> Richard MacDonald
> Punta Gorda, Florida
> 76 Edgemonte TZE 266V102313
> Howell TBI EBL
>
>
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Re: Duracool, what should pressures be? [message #207174 is a reply to message #207168]

Wed, 08 May 2013 15:11

An87ttype

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Registered: September 2012

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I just charged mine last night. I evacuated, and put in 3 cans. The glass cleared at about 2.5 cans and it ended up at 25# at 1500rpm. Works great!

If its warming up, and the compressor is still running, I suspect too much Duracool. If its kicking off it may be low.

I usually just like to start over. A quick evacuate, and 3 cans Duracool.

1975 Eleganza II Hudson Valley NY

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Re: [GMCnet] Duracool, what should pressures be? [message #207175 is a reply to message #207174]

Wed, 08 May 2013 15:24

Mr ERFisher

Messages: 7117
Registered: August 2005

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>
> I just charged mine last night. I evacuated, and put in 3 cans. The glass
> cleared at about 2.5 cans and it ended up at 25# at 1500rpm. Works great!
>

ther sight glass does not work with duracool

gene

>
> If its warming up, and the compressor is still running, I suspect too much
> Duracool. If its kicking off it may be low.
>
> I usually just like to start over. A quick evacuate, and 3 cans Duracool.
> --
> 1975 Eleganza II
> Hudson Valley NY
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Re: Duracool, what should pressures be? [message #207176 is a reply to message #207168]

Wed, 08 May 2013 15:37

An87ttype

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Registered: September 2012

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I agree you can't rely on the site glass, but it did clear at about 2.5 cans. 3 cans seems about right though. I don't know the exact amount, but it works pretty good.

1975 Eleganza II Hudson Valley NY

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Re: [GMCnet] Duracool, what should pressures be? [message #207177 is a reply to message #207176]

Wed, 08 May 2013 15:42

Emery Stora

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Registered: January 2011

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It takes 3 cans or sometimes a little bit less. When I said 20 psi at 1500 rpm I forgot to mention that the pressure will vary depending on the ambient temperature when you do the installation. If you have 25 psi with three cans that is fine.

The site glass doesn't mean anything with Duracool. That only works with R12. It is just coincidence that it cleared for you. Usually it just continues bubbling even with the right amount of Duracool.

Emery Stora

On May 8, 2013, at 2:37 PM, Daryn <An87ttype@hotmail.com> wrote:

>
>
> I agree you can't rely on the site glass, but it did clear at about 2.5 cans. 3 cans seems about right though. I don't know the exact amount, but it works pretty good.
> --
> 1975 Eleganza II
> Hudson Valley NY
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Re: Duracool, what should pressures be? [message #207178 is a reply to message #207168]

Wed, 08 May 2013 16:17

Oldngray

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Registered: August 2009
Location: Punta Gorda Florida

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Thanks much, Will go to work.

Richard

Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015

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