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: 260

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

Don Fitchett joined Diane Chojnowski's group
Thumbnail

Facebook Pages

Does your company or organization have a Facebook Page?This group is for pros who have facebook…See More
38 minutes ago
Mike Kandel added 3 discussions to the group Building Performance Institute (BPI)
1 hour ago
Mike Kandel posted discussions
1 hour ago
EnergyLogic Academy updated an event

RESNET Phase 2 Rater Training - Field Training at EnergyLogic Academy - Berthoud CO

September 22, 2014 to September 24, 2014
The EnergyLogic Academy will be hosting the second phase of HERS Rater Training August 4th - 7th,…See More
1 hour ago
Mike Kandel commented on David Byrnes's blog post Strategies To Keep Millennials At Their Peak Performance In A Home Performance Company
"David - I'd like to speak with you about this article. Please email me at mkandel@bpi.org."
1 hour ago
Hal Skinner replied to Richard Beyer's discussion Spontaneous Combustion and Flash Fire regarding Spray Foam Insulation
"This thread has certainly turned into what sounds like  a thread from a fire safety website…"
4 hours ago
Barbara Smith replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"RIVEC is a project of the Lawrence Berkeley Lab.  It's a residential ventilation fan…"
4 hours ago
tedkidd replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"Richard, I don't "Know" that the earth is not flat, but I'm pretty confident it…"
5 hours ago
Shawn O'Neill replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"    Great discussion and points brought up via this "fuse" lit.  More…"
6 hours ago
John Proctor commented on Christopher Morin's blog post How do You Test a TXV?
"Oh yes one more item. There has to be a combination of water and ice to achieve 32 degrees F. That…"
6 hours ago
John Proctor commented on Christopher Morin's blog post How do You Test a TXV?
"Thank you for the nice post. Remember that the important thing is the actual superheat that…"
6 hours ago
Robert (Bob) Bacon commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Hi Kurt, Great question - I've been there. I am a business owner specializing in window…"
7 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service