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| Re: [GMCnet] Refrigerant used in GMC's house A/C [message #319792 is a reply to message #319740] |
Fri, 30 June 2017 08:23   |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Most roof systems are like home window units with hermetic soldered system and no service ports. If there is a leak, usually a component has failed. Service ports can be soldered in but system has to be at atmospheric pressure to do so, then the leak repaired, evacuated and recharged.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Refrigerant used in GMC's house A/C [message #319794 is a reply to message #319792] |
Fri, 30 June 2017 11:06 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Roof units can be repaired even if it has a leak. Problem today it is non profitable for AC service companies to repair over installing a new unit and the cost benefit ratio make it cheaper to buy new. A lot of younger AC techs do not know how to trouble shoot a unit correctly. The following is a Piercing Valve for adding a port to a sealed system. Been using this type of a valve for over 30 years to repair Wall/Window mounted AC units and central AC units.
http://www.gmcmhphotos.com/photos/general-pictures/p63389-img-11781.html
Just upgraded our Heat Pump/AC unit in Tucson to a high efficient unit and uses the newer refrigerants and runs at a considerably hight pressure than the older coolants.
JR Wright
Michigan
> On Jun 30, 2017, at 9:23 AM, John R. Lebetski wrote:
>
> Most roof systems are like home window units with hermetic soldered system and no service ports. If there is a leak, usually a component has failed.
> Service ports can be soldered in but system has to be at atmospheric pressure to do so, then the leak repaired, evacuated and recharged.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Refrigerant used in GMC's house A/C [message #319914 is a reply to message #319794] |
Mon, 03 July 2017 10:23 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Senior Member |
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powerjon wrote on Fri, 30 June 2017 11:06Roof units can be repaired even if it has a leak. Problem today it is non profitable for AC service companies to repair over installing a new unit and the cost benefit ratio make it cheaper to buy new. A lot of younger AC techs do not know how to trouble shoot a unit correctly. The following is a Piercing Valve for adding a port to a sealed system. Been using this type of a valve for over 30 years to repair Wall/Window mounted AC units and central AC units.
http://www.gmcmhphotos.com/photos/general-pictures/p63389-img-11781.html
Just upgraded our Heat Pump/AC unit in Tucson to a high efficient unit and uses the newer refrigerants and runs at a considerably hight pressure than the older coolants.
JR Wright
Michigan
That is great to know. Do the newer units work as good as the older ones, or is it better to try and stay with the older coolant? I was recently discussing this very thing in case something ever happened to the roof unit (we still have one of the old ones... and that thing pumps out tons of ice cold air).
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Refrigerant used in GMC's house A/C [message #319928 is a reply to message #319914] |
Mon, 03 July 2017 13:19 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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lw8000 wrote on Mon, 03 July 2017 11:23That is great to know. Do the newer units work as good as the older ones, or is it better to try and stay with the older coolant? I was recently discussing this very thing in case something ever happened to the roof unit (we still have one of the old ones... and that thing pumps out tons of ice cold air).
Chris,
The actual fact is that the newer units are better at lots of things. You can't let that color your thinking. They are a little less efficient because the refrigerant that was designed to be an efficient refrigerant is no longer available.
If you can live with what you have, keep it. The only reason I had to change to a low profile was my barn door.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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