Eric Kjelshus replied to Dav Camras's discussion ERV integrated with H-AC or independent
"Sean says there are 100 ways - He is short over 8000 ways.   Keep your eye on what you want.   What is the goal? top 6 of  good air health,comfort,safety / Chemical Pollutants/ Carbon Dioxide/ Temperature / RH% Relative Humidity / Carbon Monoxide /…"
Nov 22
Eric Kjelshus replied to Blake Reid's discussion Hot Tubs
"I carry a watt meter with me.   tells me HZ  amps and volts and power factor.  If on a AC unit will tell how good of shape the cap is.   I have a redfish and fluke"
Oct 24
Eric Kjelshus replied to Tim Marlett's discussion Removal of bad smells from mold contaminated attic
"Make the building postive +.   Bring in outside air though return on air handler, furance or ERV/HRV.   Blow out the smells or dirt.   I have 4 story that was back filled with lumber next to roof wash out.   When dry dry dry no smell,  When lots of…"
Oct 24
Eric Kjelshus replied to Heidi McCullough's discussion ERV to mitigate negative pressure?- seeking a logic check
"Y E S!!!   Field Controls DI-1  5-8" pipe lasts 3-7 yrs  puts .15 " neg water on the flue.  2.3 amp 115 volt.  Its just a shaded pole motor and brass bearing go out with heat and dirty use. 
Tjernlund.com makes models DJ-3  Fits from 3-24"   both…"
Apr 13
Eric Kjelshus replied to Heidi McCullough's discussion ERV to mitigate negative pressure?- seeking a logic check
"On new hot water heaters standing pilot light the Eff is 57-59%   10 yr ago was 51%  20 yr ago was 45%.  50 +yr ago was just 35% with a blow tourch 3" long.   Most B1pipe  flues systems were made for water heater with a flame under tank to keep tank…"
Apr 13
Eric Kjelshus replied to Heidi McCullough's discussion ERV to mitigate negative pressure?- seeking a logic check
"Its all about the flue.  Change the Hot water heate with power vent or tankless or some thing with out a flue.   I tend to keep power type"
Apr 13
Eric Kjelshus replied to Dav Camras's discussion Designing airflow in large low load homes
"Thats very low CFM?  If cathedral ceiling and no bodys above the 8" mark just put returns there and let the peak get hot.    If you have a walk way near the peak I tend to put return very high.    With very dry areas I use higher CFM/ton 500/600CFM…"
Mar 31
Eric Kjelshus replied to Sean Wiens's discussion Hydronic System Critique
"What motors will go bad?   can the motor be changed?   Will the Heat Transfer Plats get full?  How will they get cleaned?  Aluminum fill up quick.  I find water system full of "MUD" with higher temps - how will water be conditioned?    "
Jan 14
Eric Kjelshus replied to Tom Smith's discussion Assessing the true end user price of installing a new boiler?
"I can buy most things on web.   Most jobs I am asked to put in than were on web are 35-55% there. Missing fitting - bolts - tanks - stats - paperwork.   over all no plan.  No layout.  No overview.   I still have to draw out the building - piping - …"
Dec 31
Eric Kjelshus replied to Haley Keegan's discussion Derating / Rating Old Insulation
"Open batt or open fiber will wind wash in vary cold weather so the batt says R-30 and with IR its says R-10 test same spot with out wind and is R-30.    How do you deal with wind washing?  "
Dec 30, 2019
Eric Kjelshus replied to Haley Keegan's discussion Derating / Rating Old Insulation
"Use your IR camera and make your own "R"  If you have a high end IR camera and 40' plus temp - you can get close.   If you know if that one part is  R-15 and next part is 1/2 or R-7.5  its just a % of known.   More time is needed for plan "B" …"
Dec 24, 2019
Eric Kjelshus replied to Sean Wiens's discussion How many BTU required to heat air
"also think about how long the hot water heater will last?    How hot of water is needed?  120' 130' 140'  the hotter the water the more lime ( mix of hardness) will set on bottom or sides.   Also think about the sacrificial Anode Rod?   Once the…"
Dec 12, 2019
Eric Kjelshus replied to Julie Saporito's discussion Heat pump failure during high heat days?
"I find most heat pumps need cleaning 2- 3-4 times a year.  When dirty coil do not transfer heat well.  High heat kills compressors and motors.  With lack of air flow or water vapor in HVAC system just rotts.  I have air and water Heat PUmps now 40…"
Oct 13, 2019
Eric Kjelshus replied to Haley Keegan's discussion Baffles without soffit vents?
"Unless the soffit is caulked or foamed sealed there's lots of holes.   Some time put smoke/fog/light in an attic  and see the holes.   I was watching fiber glass breath the smoke with air flow.   "
Sep 9, 2019
Eric Kjelshus replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"I do a heat loss/gain each "bid"  some times 3 ways.   I like to use fuel usage with a good program. If not use are going to be off.    find a person who is big big and middle age they will take more AC and less heat.   Find a young and fit is…"
Jul 21, 2019
Eric Kjelshus replied to Jacob Corvidae's discussion The problems with gas stoves
"If you use a stove in a well sealed building you will need make up air to keep building positive and hood to take out bad air.   Small hoods are just 300 CFM and under or about 50-100 CFM per Square foot -you can get by with opening a door or window…"
Jul 7, 2019
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