Undersized And Oversized - HVAC - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 05-09-2011, 08:39 PM   #1
Join Date: May 2011
Posts: 1
Rewards Points: 10

undersized and oversized

what is the effect of undersized and oversize compressor, condenser, and evaporator..


Farzeem Khan is offline   Reply With Quote
Old 05-09-2011, 08:45 PM   #2
Hvac Pro
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,094
Rewards Points: 826

undersized and oversized

Why do you want to know. There are 12-24 different problems with those and you need to understand the fundamentals of refrigeration to understand them.


"Cut it twice and it is still too short".
yuri is offline   Reply With Quote
Old 05-09-2011, 09:39 PM   #3
An old Tradesmen
Join Date: Oct 2008
Location: PA
Posts: 26,471
Rewards Points: 4,588

undersized and oversized

Thats a bigger question then you realize.

Can you n arrow down the question to what your application is.
beenthere is offline   Reply With Quote
Old 05-09-2011, 09:51 PM   #4
Wire Chewer
Red Squirrel's Avatar
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,221
Rewards Points: 2,020

undersized and oversized

undersized: will run forever and take very long to cool - inefficient
oversized: will not run long enough, stop right away, only to start again shortly after. So lot of on/off cycles. Also inefficient. Will also never give the coil a chance to collect much water, so the humidity control won't be very good.

I'm sure there is more to it too but that's the jist of it.

I learned about the oversizing factor with my 1 ton AC unit I use in a 70 square foot room.
Red Squirrel is offline   Reply With Quote

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
Oversized Furnace, Undersized Return Air vents and Low Heat Output.... ?? LabRat0116 HVAC 4 10-04-2010 09:53 PM
Undersized evaporator coil peterk HVAC 4 05-05-2010 06:22 PM
Reducing BTU's tedhermitage HVAC 11 10-28-2009 06:55 PM
boiler undersized? or oversized drdon51 HVAC 27 01-15-2009 01:52 PM

Top of Page | View New Posts