replace hvac system question

Posted by aka-SBM on July 11, 2006, 1:04 am

>>Thanks.

>>> You would want to stick to the manufacturers specs here, the size of
>>> the suction line changes due to different types of refrigerant moving
>>> at different velocities using a suction line size smaller than the
>>> recommended one will compromise the efficiency and the life cycle of
>>> the unit. Refrigerant needs to travel at a speed that is optimum to the
>>> system, in order to deliver the full cooling effect and also return oil
>>> to the mechanical components in the system, the velocity difference
>>> through a 7/8 pipe as compared to 1/18 pipe at the same nominal tonnage
>>> is very large, and unacceptable.
>>> Thanks
>>> Fat Eddy
>>> www.hvactalkforum.com

> 1-1/8" is good but why stop there? Make that system really purr.
> Install 2-1/2" piping and a 3/4" liquid line. That should really be a
> killer system.
> Bubba

Opps...my bad..imagine the amp draw drop on that sucker.....lol
I dunno if id wanna charge it tho...

Posted by Bubba on July 11, 2006, 9:06 pm

wrote:

>>>Thanks.
>>>> You would want to stick to the manufacturers specs here, the size of
>>>> the suction line changes due to different types of refrigerant moving
>>>> at different velocities using a suction line size smaller than the
>>>> recommended one will compromise the efficiency and the life cycle of
>>>> the unit. Refrigerant needs to travel at a speed that is optimum to the
>>>> system, in order to deliver the full cooling effect and also return oil
>>>> to the mechanical components in the system, the velocity difference
>>>> through a 7/8 pipe as compared to 1/18 pipe at the same nominal tonnage
>>>> is very large, and unacceptable.
>>>> Thanks
>>>> Fat Eddy
>>>> www.hvactalkforum.com

>> 1-1/8" is good but why stop there? Make that system really purr.
>> Install 2-1/2" piping and a 3/4" liquid line. That should really be a
>> killer system.
>> Bubba

>Opps...my bad..imagine the amp draw drop on that sucker.....lol
>I dunno if id wanna charge it tho...

I had one like that too. Trane 50 ton 460v 3Ph on a school rooftop. My
GAWD that thing could suck down 30lb jugs of freon like it was a sip
of water. We would usually add 90 to 120lb every late spring. Hold on
now, dont get ahead of me. YES, we did leak checks and leak repairs
all the time. This ol granny of a machine could leak anywhere,
anytime. The "Hot-Deck" piston actuators, any bolt/gasket/plate you
like on the compressor, the liquid line shell driers, sight glasses,
expansion valves, headers on the condenser, etc, etc, etc. We finally
lost the account when the whole school system went with a national
firm. I was never happier. Never to have to carry 4 full jugs of
refrigerant up and down long ladders. :-)
Bubba

Posted by aka-SBM on July 12, 2006, 4:26 am

> wrote:

>>>>Thanks.
>>>>> You would want to stick to the manufacturers specs here, the size of
>>>>> the suction line changes due to different types of refrigerant moving
>>>>> at different velocities using a suction line size smaller than the
>>>>> recommended one will compromise the efficiency and the life cycle of
>>>>> the unit. Refrigerant needs to travel at a speed that is optimum to
>>>>> the
>>>>> system, in order to deliver the full cooling effect and also return
>>>>> oil
>>>>> to the mechanical components in the system, the velocity difference
>>>>> through a 7/8 pipe as compared to 1/18 pipe at the same nominal
>>>>> tonnage
>>>>> is very large, and unacceptable.
>>>>> Thanks
>>>>> Fat Eddy
>>>>> www.hvactalkforum.com
>>> 1-1/8" is good but why stop there? Make that system really purr.
>>> Install 2-1/2" piping and a 3/4" liquid line. That should really be a
>>> killer system.
>>> Bubba

>>Opps...my bad..imagine the amp draw drop on that sucker.....lol
>>I dunno if id wanna charge it tho...

> I had one like that too. Trane 50 ton 460v 3Ph on a school rooftop. My
> GAWD that thing could suck down 30lb jugs of freon like it was a sip
> of water. We would usually add 90 to 120lb every late spring. Hold on
> now, dont get ahead of me. YES, we did leak checks and leak repairs
> all the time. This ol granny of a machine could leak anywhere,
> anytime. The "Hot-Deck" piston actuators, any bolt/gasket/plate you
> like on the compressor, the liquid line shell driers, sight glasses,
> expansion valves, headers on the condenser, etc, etc, etc. We finally
> lost the account when the whole school system went with a national
> firm. I was never happier. Never to have to carry 4 full jugs of
> refrigerant up and down long ladders. :-)
> Bubba

Dunno if it matters, but a little hint I got years back doing condos in Palm
Springs..
Tie yer jugs to a rope, carry the rope up with you and when you get to the
top...start pullin.
Much easier than trying to do a one man balance act.

Posted by Stormin Mormon on July 12, 2006, 10:34 am

Some way to run some tubing down into the building, and put a schrader
valve on the first floor. So you could wheel in your jug of juice,
hook it up, and come back in a couple hours.

Yep, thirty pounders can really wear you out to get them up a ladder.
Even roping it up is still a heck of a lot of work.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
.

I had one like that too. Trane 50 ton 460v 3Ph on a school rooftop. My
GAWD that thing could suck down 30lb jugs of freon like it was a sip
of water. We would usually add 90 to 120lb every late spring. Hold on
now, dont get ahead of me. YES, we did leak checks and leak repairs
all the time. This ol granny of a machine could leak anywhere,
anytime. The "Hot-Deck" piston actuators, any bolt/gasket/plate you
like on the compressor, the liquid line shell driers, sight glasses,
expansion valves, headers on the condenser, etc, etc, etc. We finally
lost the account when the whole school system went with a national
firm. I was never happier. Never to have to carry 4 full jugs of
refrigerant up and down long ladders. :-)
Bubba

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