replace hvac system question

Posted by Fat Eddy on July 10, 2006, 9:46 pm

WSZsr wrote:

> I am considering aTrane XL19i system to replace my old Carrier system. I
> have a 7/8" lineset that is about 20 feet long. Is that adequate for an
> XL19i. I do not want to lose efficiency due to a lineset that is too small
> Thanks from Round Rock, TX
> --
> If I had something witty to say, this is where I'd say it.

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

Posted by WSZsr on July 10, 2006, 10:04 pm

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
>

Posted by Bubba on July 11, 2006, 12:41 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

Posted by aka-SBM on July 11, 2006, 1:03 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

Imagine the RLA on that..LOL

Posted by on July 11, 2006, 9:26 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

>Imagine the RLA on that..LOL

heh...... I DO happen to have such a split system......actually its
got a 2-3/8 suction and 1-1/8 liquid line. Its up for maint this
month, I'll get back to ya what the RLA is........had to replace the
200 amp disconnect last year........

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