Christopher Morin
  • Male
  • Clinton, MA
  • United States
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Christopher Morin's blog post was featured

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 Conservation…See More
yesterday
Christopher Morin posted a blog post

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 Conservation…See More
Sunday
Christopher Morin's blog post was featured

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…See More
Aug 14
Christopher Morin posted a blog post

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…See More
Aug 12
John Proctor commented on Christopher Morin's blog post How do You Test a TXV?
"Correction 32 is the melting point, not the saturation temperature."
Jul 28
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 is the saturation temperature. Ice alone can be much colder than 32 degrees F. ProctorEng.com"
Jul 24
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 exists entering the compressor is what we really want to control. Superheat serves only one positive purpose -- protecting the compressor from…"
Jul 24
Christopher Morin's 2 blog posts were featured
Jul 23
Christopher Morin posted a blog post

How do You Test a TXV?

  Thermostatic Expansion Valves (TEV or TXV), one of the most popular metering devices for residential, high-efficient air conditioning and heat pumps, have performed almost impeccably for decades.  Unfortunately, some manufacturers in the past few years have identified batches of valves that have had high superheat issues.  Have we just been blind for so long, not realizing these problems existed?  Or have these valves really been so reliable for such a long time?  If you think you may have a…See More
Jul 21
Christopher Morin posted a blog post

Please, Make the Transition!

  For as long as I can remember, the agreed epidemic with ductwork was always undersized return ducts.  Although we are far from perfect with duct sizing in New England, I have frequently seen great strides in fixing this issue - particularly with replacement systems.  Lets face it, you should just be properly designing the duct system on new installations.  Undersized ducts cause great restrictions in airlfow, raising…See More
Jul 17
Christopher Morin posted a status
"Excess Air has a new look! Check it out & subscribe by e-mail for great new content coming soon... http://excessair.blogspot.com"
Jul 16
Walter Ahlgrim commented on Christopher Morin's blog post DIY Minisplits: Which side are you on?
"The following quote does not ring true to me “System Efficiency  -  A 115V mini-split will almost always use more watts than the same size 208/230V counterpart.” If you can support this statement with independent research I…"
Jun 29
Eric Kjelshus commented on Christopher Morin's blog post Top 5 A/C Code Requirements not Enforced
"We just did comm job 50 sf per ton 100% outside air,  res very tight home with R- 20 wall and R-60 attic R-10 windows casement 1100 sf per ton.   Use better soft ware"
Jun 16
Bob Blanchette commented on Christopher Morin's blog post Top 5 A/C Code Requirements not Enforced
"Man J is too easy to fudge by changing input values. Is it a coincidence that most come out to about 500sqft per ton regardless of location and age of home?"
Jun 16
Christopher Morin's blog post was featured

Top 5 A/C Code Requirements not Enforced

  This list does not represent the entire code, or even all municipalities.  Everyone knows those towns that will hit you on every piece of the local code requirements, word for word from the text.  But, don't be surprised when code officials, both building and mechanical inspectors, start failing permit inspections for these previously rarely enforced portions of the code!  Are you going to wait until enforcement, or lead the industry in doing what the minimum is required by law?1.  Duct…See More
Jun 10
Eric Kjelshus commented on Christopher Morin's blog post Top 5 A/C Code Requirements not Enforced
"I was teaching a class to high school kids  and I saw a " huffier"  with R-12  and sliver paint.   Most just steal the brass off the caps and make ear lobe hangers off the caps.    "
Jun 9

Profile Information

Company
Conservation Services Group
Professional Certification
BPI BA, NATE, MA Master Sheet MetaL
Blog URL
http://excessair.blogspot.com
Facebook Page
http://www.facebook.com/pages/Excess-Air/208884575867523
LinkedIn Profile
http://www.linkedin.com/profile/view?id=59140122&trk=tab_pro

Christopher Morin is currently the HVAC Technical Field Representative for Conservation Services Group (CSG) and the Cool Smart Program. An ACCA approved Residential System Design Instructor, Christopher instructs participating contractors and technicians on proper system design, quality installation verification (QIV), Energy Star Quality Installation (ESQI), and duct testing – both in the classroom and in the field. Christopher holds a B.S. in Business Management from University of Phoenix, MA Master Sheet Metal License, BPI Building Analyst, as well as NATE Certifications in Installation and Service for Heat Pumps, Air-Conditioning, and Gas Furnaces.

Christopher Morin's Blog

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

Posted on August 17, 2014 at 4:59pm

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

Posted on August 12, 2014 at 1:19pm

How do You Test a TXV?

  Thermostatic Expansion Valves (TEV or TXV), one of the most popular metering devices for residential, high-efficient air conditioning and heat pumps, have performed almost impeccably for decades.  Unfortunately, some manufacturers in the past few years have identified batches of valves that have had high superheat issues.  Have we just been blind for so long, not realizing these problems existed?  Or have these valves really been so reliable for such a long time?

  If you think you…

Continue

Posted on July 21, 2014 at 6:30pm — 3 Comments

Please, Make the Transition!

  For as long as I can remember, the agreed epidemic with ductwork was always undersized return ducts.  Although we are far from perfect with duct sizing in New England, I have frequently seen great strides in fixing this issue - particularly with replacement systems.  Lets face it, you should just be properly designing the duct system on new installations.  Undersized ducts cause great restrictions in airlfow, raising…

Continue

Posted on July 17, 2014 at 5:29pm

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