Joined on August 11, 2008
Last Post on September 16, 2014
@ April 1, 2014 6:04 PM in Thermal Expansion Tankabsolutely do need an expansion tank for DHW, if there is a PRV present.
@ March 31, 2014 8:25 PM in Navien 240 combi installed - I have concerns"The new pex that we ran in the house is 3/4" runs, down to 1/2" to the taps/appliances, so I doubt it's the new piping. Something tells me more and more it's the pressure from outside the house".
@ March 31, 2014 8:23 PM in Navien 240 combi installed - I have concerns"I just spoke to the city and my water main was upgraded in 1989 to a 3/4" line from the city side".
@ March 31, 2014 8:22 PM in Navien 240 combi installed - I have concerns"I just spoke to the city and my water main was upgraded in 1989 to a 3/4" line from the city side".
@ March 31, 2014 7:41 PM in Navien 240 combi installed - I have concernsHe's got 3/4" from the main at 100+ psi. The drastic drop in gpm with multiple fixtures can't be attributable to that. I believe he said he had 3/4" with 1/2" to the fixtures. I don't know for sure, but there is the possibility that when he had a tank type water heater, turning the PRV down may have been someones answer to a dripping relief valve, in the absence of an expansion tank. Just a W.A.G.
@ March 31, 2014 1:57 PM in Navien 240 combi installed - I have concernsMaybe the PRV is adjusted to 20 psi? Buy a $20 sillcock gauge. Make sure the sillcocks are piped after the PRV, and CHECK THE PRESSURE.
@ March 31, 2014 1:37 PM in Navien 240 combi installed - I have concernsI guess 22 or 23 GPM to the house would not be enough.
@ March 31, 2014 1:20 PM in Navien 240 combi installed - I have concernsAs said....Check the pressure in the house. Is there a PRV on the supply where it enters the home from the street? With that kind of pressure at the main, you should not be having the problems you're having.
@ March 30, 2014 5:08 PM in radiator paintJamie gets the prize! You've selected the one type of paint they say not to use on radiators.
@ March 30, 2014 12:03 PM in Navien 100,000 btu heatingI need some more direction to that webinar. Naviens answer seems to defy everything I've learned about P/S piping.
@ March 21, 2014 1:21 PM in Please critique this designThat strategy falls into the "Six of one...Half-a Dozen of another" category. Based on the definition of a BTU, it should take the same amount of time to heat the water to a certain temperature, whether you are alternating zones, or feeding the home as a whole. I'll stop beating a dead horse about the whole system. I didn't reallize you only wanted to talk about control and stop-gap measures. Best Wishes
@ March 21, 2014 9:58 AM in Please critique this designYou are not going to get what you want at design day(or lower) temperatures, with the emitters you have.
@ March 20, 2014 4:11 PM in Please critique this designWould be best spent making sure you could heat the house with 130* water on design day. The output of the baseboards falls off significantly at that temperature. You need to make sure you have enough emitter in each room. I'd use the TRVs in sleeping areas, and let the ODR do it's thing handling the bulk of the home.
@ March 20, 2014 12:07 PM in Please critique this designI'm just not sure what type of windows you have to use to allow space travel.
@ March 18, 2014 10:47 PM in Please critique this designwell do the emitters match the heat loss, room by room?
@ March 18, 2014 10:36 AM in Please critique this designGot mixed up with your shoulder season example. It's an age thing, I guess.
@ March 18, 2014 10:32 AM in Please critique this designThe setting for the mixing valve for domestic is different at different temps. How do you ensure no one gets scalded?
@ March 18, 2014 10:26 AM in Please critique this design"Design day heat load 40k BTU/hr"
You say you have 24k btus of emitters?
@ March 18, 2014 10:19 AM in Please critique this designOnce the DHW is satisfied, it will then switch to heat if there is a call. But according to your drawing, it will continue sending hot water through the indirect.
@ March 18, 2014 9:32 AM in Please critique this designWhat happens when the DHW is at 140*, and there is a call for heat?