Vital to the operation of the refrigeration cycle, superheat must be maintained and stable to protect the compressor.  We all know that the heart of the system cannot compress liquid (slug) without bad things happening.  This would represent low/no superheat.  But, did you know high superheat can cause valve and compressor problems as well?  No matter the reason for attaching your gauges to the system, you must check the superheat, in the air-conditioning cycle.

Read More

Views: 290

Comment

You need to be a member of Home Energy Pros to add comments!

Join Home Energy Pros

Comment by Bob Blanchette on January 16, 2014 at 2:12pm

Depends on type of system. TXV and Fixed orifices have different charging methods. As Steven stated airflow needs to be addressed, in many systems it falls WAY short. 3+ ton systems seem to be the worst offenders.

Comment by Steven Lewis on January 16, 2014 at 8:12am

Super heat readings without knowing airflow only gives you 1/2 the equation.  Dirty filters/ low airflow/refrigerant overcharge/low temp in building or low outdoor temp will all affect the superheat of the system.  If the superheat is out of range (high or Low) then the cause needs to be determined and corrected.  We all say that the house is a system but in HVAC  I say everything is Relative.  When you change one condition, it effects everything else, so it not the superheat temp but how it relates to the other information you gather.  As an example an A/C can have a high super heat of 20 if the indoor temp is high 88+ and outdoor temps are high as well and then when the unit has the house cooled down and running under normal conditions the superheat will be in normal range ( approx 8)  If you tried to charge the unit to reach the 8' you  would have vastly overcharged the system and dramatically raised its operating costs and shortened it life while making the homeowner uncomfortable as well.

Comment by Eric Kjelshus on January 10, 2014 at 6:34pm

I had a printer ask for just 2' superheat +-1'  to keep the paper very dry and never shut down the air handler/AC unit no case heater.    Most ask for 8'+ up to 30' superheat  next to the compresser.  so whats the deal?

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Andrew Peel posted an event

Using PHPP in Building Design and Certification at Queen's Quay

November 24, 2014 at 9am to November 25, 2014 at 5pm
In this two-day course, participants will learn how to use the PHPP for residential building design…See More
21 minutes ago
Graham Irwin replied to George Kopf's discussion How does efficiency factor into a grid parity world?
"John, Interesting though, if you read this NREL article…"
1 hour ago
John C. Semmelhack replied to George Kopf's discussion How does efficiency factor into a grid parity world?
"Graham, The U.S. is catching up to Germany very quickly on solar installs. As of the end of 2013,…"
1 hour ago
Ben Jacobs replied to Isaiah Borel's discussion Blown Cellulose VS Blown Fiberglass in the Attic
"Hi Isaiah, I have experience with both fiberglass and cellulose. I think that cellulose is…"
2 hours ago
Dolores Bevilacqua posted events
3 hours ago
Bob Blanchette replied to Dave Robinson's discussion Can We PLEASE Stop Calling Them “Ductless” in the group 1000 Home Challenge
"Concealed units in hallway ceilings aren't new. Apartments have been using them for decades."
3 hours ago
Graham Irwin replied to George Kopf's discussion How does efficiency factor into a grid parity world?
"George, You raise a good question. The concept of "free and unlimited" energy is not…"
4 hours ago
David Byrnes posted an event
Thumbnail

Best Lead Source For Energy Auditors at Your computer

November 1, 2014 at 12am to January 3, 2015 at 7pm
In 2009 I started my energy auditing company, Green ID, with over $3,000 in credit card debt to…See More
4 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service