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Old 07-01-2013, 01:54 PM   #46
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Please help me correctly size my A/C condenser


I did not say the system will last or even work properly and I stated that many posts ago on the original thread when we discussed the 8 SEER coil with a 10 SEER condenser. complete waste of good time and $$ IMO but our poster has limited $$ and wants to try cobble it together for awhile. not my choice. my point is we did not have or use micron gauges until R410 came out as moisture was not destroying systems or on the manufacturers radar. pure low temp refrig is different but that is not the same as AC. putting a new larger filter drier in will compensate for any small amount of moisture and how long do we really expect this cobbled together system to last. the Pros know better. Glad to hear the ole guy is still kickin.

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Old 07-01-2013, 07:22 PM   #47
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by yuri View Post
I did not say the system will last or even work properly and I stated that many posts ago on the original thread when we discussed the 8 SEER coil with a 10 SEER condenser. complete waste of good time and $$ IMO but our poster has limited $$ and wants to try cobble it together for awhile. not my choice. my point is we did not have or use micron gauges until R410 came out as moisture was not destroying systems or on the manufacturers radar. pure low temp refrig is different but that is not the same as AC. putting a new larger filter drier in will compensate for any small amount of moisture and how long do we really expect this cobbled together system to last. the Pros know better. Glad to hear the ole guy is still kickin.


It's cooling the house very well,
quickly, & cycles.

I'm very pleased & hope I can enhance the longevity of the system.

I'm interested in having the system adjusted & balanced, as well as the installed components will allow.

I'm planning to ask an Installer/Tech to check the "Sub cooling and Super heat readings along with the unit amp-draw".
What is the range for each of these specifications, or where should I be able to find them?

What else should I have checked (I mean, what else on the A/C)?

Thanks Again,
Uni
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Old 07-01-2013, 07:26 PM   #48
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Please help me correctly size my A/C condenser


Do you have a TXV, or fixed metering device.
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Old 07-01-2013, 07:41 PM   #49
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by beenthere View Post
Do you have a TXV, or fixed metering device.
Hi BeenThere,

I was told it's an orifice, 3/8" x 3/4".

Thanks,
Uni
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Old 07-01-2013, 11:30 PM   #50
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Please help me correctly size my A/C condenser


Indoor wetbulb needs checked to know what the SH should be. SC should not be more then 10 degrees higher at the most.
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Old 07-02-2013, 12:01 AM   #51
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by beenthere View Post
Indoor wetbulb needs checked to know what the SH should be. SC should not be more then 10 degrees higher at the most.
Please explain what you have written.
What should all of the specifications be you have previously asked about?

What is "indoor wetbulb"?

Last edited by Unicornz0; 07-02-2013 at 12:07 AM.
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Old 07-02-2013, 12:41 AM   #52
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Please help me correctly size my A/C condenser


Should I be concerned about the superheat, since my system has an orifice, but not a TXV valve?

Should I be concerned about the subcooling, & the unit amp-draw?

I'm trying to have my system run as well as the installed components will allow.

Please advise.

Thanks In Advance,
Uni
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File Type: pdf Carrier SUBCOOLING.pdf (32.0 KB, 22 views)
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Old 07-02-2013, 05:48 AM   #53
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by Unicornz0 View Post
Please explain what you have written.
What should all of the specifications be you have previously asked about?

What is "indoor wetbulb"?
The lowest temp that moisture will evaporate at. It along with the outdoor temp are need to determine target SH.

Amp draw is not specific. It will vary by the conditions of the day. it should be less then then RLA listed on the data tag.

Since you have a piston, the Carrier SC chart does not apply.
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Old 07-02-2013, 07:57 AM   #54
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by beenthere View Post
The lowest temp that moisture will evaporate at. It along with the outdoor temp are need to determine target SH.

Amp draw is not specific. It will vary by the conditions of the day. it should be less then then RLA listed on the data tag.

Since you have a piston, the Carrier SC chart does not apply.

Thank you BeenThere.

Which piston are you referring to?
There is an orifice.
How should SC be determined?

Last edited by Unicornz0; 07-02-2013 at 08:04 AM.
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Old 07-02-2013, 05:06 PM   #55
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by Unicornz0 View Post
Thank you BeenThere.

Which piston are you referring to?
There is an orifice.
How should SC be determined?
The indoor metering device. Orifice or piston, is a fixed metering device. SC can not be targeted for it. Only SH.
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Old 07-02-2013, 05:11 PM   #56
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by beenthere View Post
The indoor metering device. Orifice or piston, is a fixed metering device. SC can not be targeted for it. Only SH.
Thanks.

What should super cooling be compared to, to insure super cooling is at the correct level?
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Old 07-02-2013, 05:31 PM   #57
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SC/Subcooling should be within 10 degrees of teh superheat after the indoor temp is near set point.
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Old 07-02-2013, 06:22 PM   #58
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by beenthere View Post
The indoor metering device. Orifice or piston, is a fixed metering device. SC can not be targeted for it. Only SH.
Thank you.

In this particular situation how then can sub cooling be calculated, & compared against super heat?

Please explain in detail.
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Old 07-02-2013, 06:27 PM   #59
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by Unicornz0 View Post
Thank you.

In this particular situation how then can sub cooling be calculated, & compared against super heat?

Please explain in detail.
When the indoor temp is near the set point temp. take a wetbulb reading. Check outdoor air temp entering the condense. use a superheat slide chart and determine what the super heat should be. if the super heat is near that amount. Then the subcooling should be within 10 degrees of that.
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Old 07-03-2013, 02:01 AM   #60
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Please help me correctly size my A/C condenser


Quote:
Originally Posted by beenthere View Post
When the indoor temp is near the set point temp. take a wetbulb reading. Check outdoor air temp entering the condense. use a superheat slide chart and determine what the super heat should be. if the super heat is near that amount. Then the subcooling should be within 10 degrees of that.
Thank you BeenThere.

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