Choice Of DIY AC? - HVAC - Page 2 - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 08-18-2011, 03:23 PM   #16
Member
 
Join Date: Jul 2011
Posts: 150
Rewards Points: 75
Default

Choice of DIY AC?


Quote:
Originally Posted by yuri View Post
...You don't need one. ONLY if the compressor/condensor is 10 ft or more ABOVE the coil and has to lift the oil. Yours will be below...
*** OK, not an oil trap. Rather, an inverted loop - I guess to make triple sure that no liquid refrigerant makes its way down the suction line.
From the Goodman installation manual:

"Mounting the evaporator coil above the condensing unit will require an inverted loop in the suction line adjacent or near the connection to the evaporator. The top of the loop must be slightly higher than the top of the coil."

- JerryK

Advertisement

jerryk1234 is offline   Reply With Quote
Old 08-18-2011, 03:40 PM   #17
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,137
Rewards Points: 912
Default

Choice of DIY AC?


Thats news to me and sounds like a bit of overkill on their part to protect the compressor but I could be wrong. If you have PROPER superheat then you will only have vapor leaving the evap coil in the last 1/4 of it. That is why it is called a superheated vapor. Read up in your refrig book about that. If they were that concerned about blowing compressors they would put an accumulator in the suction line B4 the compressor like a heat pump has. (Actually that would cost them to much $$ so they pass the cost of this loop to you?) I will check some Lennox install info to see what they recommend. (Checked and they don't mention that so I don't see it being a problem). Attic units are less than 1% of my market so there may be a reason they want that and some of the other Pros may know why. May also be that some installers don't level/slope the unit properly and they may be getting oil hanging up inside the coil and starving the compressor. The loop changes the velocity of the suction vapor and may cause better oil return.
__________________
"Cut it twice and it is still too short".

Last edited by yuri; 08-18-2011 at 03:59 PM.
yuri is offline   Reply With Quote
Old 08-18-2011, 08:19 PM   #18
Member
 
Join Date: Jul 2011
Posts: 150
Rewards Points: 75
Default

Choice of DIY AC?


[quote=yuri;710145]Thats news to me and sounds like a bit of overkill on their part to protect the compressor but I could be wrong. If you have PROPER superheat then you will only have vapor leaving the evap coil in the last 1/4 of it.
*** Indeed. Let me play devil's advocate. Suppose that the superheat is being controlled by a TXV. When the superheat gets low ( meaning that liquid is getting close ) the TXV cranks down on the input refrigerant.
The TXV is, however, a mechanical device. It can conceivably stick wide open, drowning the evaporator in refrigerant. Which then squirts on down the line and breaks the compressor.

So the loop adds suspenders to the TXV's belt. Just a guess.

- JerryK
jerryk1234 is offline   Reply With Quote
Old 08-18-2011, 08:28 PM   #19
Member
 
Join Date: Jul 2007
Posts: 417
Rewards Points: 282
Default

Choice of DIY AC?


Get yourself a 14 SEER goodman Heat pump. That's what I did and I love it! With the 14 SEER you get the super quiet compressor and fan. And a lifetime warranty on the compressor (which in the case of DIY means, higher quality). You can buy it from AC wholesalers or Route AC and have it drop-shipped to your door.. 2.5 ton unit is like 1400 bucks.

With the heat pump, you save money year round (if you're in the right climate).

My heat pump saves me 200 bucks a year and cost me ~300 more on my DIY install.


-Jeff

Advertisement

zootjeff is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lawn seed - landscapers choice MC FORD Landscaping & Lawn Care 1 06-24-2011 05:07 PM
is Malarkey a good choice? analogmusicman Roofing/Siding 12 05-12-2010 10:48 AM
Need more power, Sub panel best choice? Hotel Electrical 6 03-07-2010 08:38 AM
Need help with unheated sunroom floor choice micimco Flooring 3 03-19-2009 10:00 AM
Wirsbo good Choice? Pex? Redoing home and might use PEX? twilightcall Plumbing 1 01-14-2008 05:43 PM




Top of Page | View New Posts