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: 645

Comment

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

Join Home Energy Pros Forum

Comment by Bob Blanchette on January 16, 2014 at 5:12pm

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 11:12am

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 9:34pm

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?

Latest Activity

Profile IconSean Wiens and David Butler joined Chris Laumer-Giddens's group
Thumbnail

Energy Efficient Design

Energy efficiency starts at the drafting table...How architects and designers can help buildings…See More
2 hours ago
Profile IconSean Wiens and David Butler joined Mark Richardson's group
Thumbnail

Renewable Energy

This group will focus on the issues associated with incorporating renewable energy sources like…See More
2 hours ago
Al Tibbs posted photos
3 hours ago
Al Tibbs replied to Bob Krell's discussion What Do You Do When You Find Suspected Mold? in the group Healthy Indoors (IAQ)
"In any case where there is visible mold present, I would begin with a thorough VISUAL assessment of…"
3 hours ago
Al Tibbs joined Bob Krell's group
Thumbnail

Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon,…See More
3 hours ago
David Byrnes posted a blog post

Strategies for Hiring and Interviewing for Home Performance Professionals

Hire slow and fire fast.  It’s a phrase that experienced managers and human resources professionals…See More
4 hours ago
David Butler posted discussions
4 hours ago
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Static pressure drop through a straight length of pipe is a function of friction rate, and friction…"
9 hours ago

Photos

  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service