Christopher Morin's Blog – August 2014 Archive (3)

Top 5 Changes to ACCA Manual S

      As I had brought up years ago, ACCA's Manual S was in dire need of an update.  Written in 1995, Manual S Residential Equipment Selection was passed by with huge technical and efficiency strides within the…

Continue

Added by Christopher Morin on August 27, 2014 at 5:30pm — 1 Comment

UPDATED: Big Changes for Duct Testing in MA

   If you have not been asked to complete a duct test by your local Massachusetts Inspector, it is just a matter of time before you are surprised by this stringent/updated code requirement.  Despite some push-back from Contractors  and Inspectors, all of MA is required to test new or altered duct systems.  All of MA adopted the 2012 International Energy…

Continue

Added by Christopher Morin on August 17, 2014 at 4:59pm — 9 Comments

No Bubbles, No Troubles!

Or is there? This saying is an old adage in our industry to let the technician know that the refirgerant charge is "all set". You see, there must be a steady stream of liquid to the metering device for it to function properly. For sake of conversation, let's use the TXV. In order for most TXV's to throttle and correctly maintain the desired Superheat, there must be a minimum of 2F of subcooled liquid at the valve (not where it is measured, near the condenser). If the liquid were to flash off… Continue

Added by Christopher Morin on August 12, 2014 at 1:19pm — No Comments

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.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Hans, The car manufacturer's are doing it with mass flow sensors and oxygen sensors…"
7 hours ago
Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"I was trying to avoid naming manufacturers, but I was going by the published information for the…"
8 hours ago
Eric Kjelshus replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"I look at this not about AFUE,  but flue gas dewpoint.  If your burn rate is rotting the…"
10 hours ago
Bob Blanchette replied to Kirsten Richnavsky's discussion Crawl spaces and attics: OSHA to implement new rule on confined spaces
"Keeping HVAC equipment out of attics should be part of the new code. "
11 hours ago
Linda Wigington replied to Linda Wigington's discussion Weigh in - Honorable Mention? 2nd Base? Half-Way There? 50% Better? On the Path? in the group 1000 Home Challenge
"Nickie -  Good points. I think it is easy enough to flag or designate projects that achieve…"
12 hours ago
Morgan M Audetat replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Though Viessmann is relatively unique in the application of Lambda technology to condensing…"
13 hours ago
Lars olsen posted a blog post
21 hours ago
Eric Kjelshus replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"The heat exchanger gets burnt out, if presser is to high or if mix is to rich, then I see holes in…"
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service