Terence McCann

You can put the detector anywhere, return air etc but where is the right place to install it? It needs to be planned out as a zoned system. You can't go about, willy-nilly, slapping controls in. You need to walk the property to determine where to place things like thermostats, CO detectors etc. Have you teamed up with any control companies? I'm happy to help but am not in a position to design/build over a home inspector forum. You need to partner with the necessary contractors. I'm sure you understand.

Mr. K should be along at any time now.

No, they go in any general area of greater occupancy/classroom. It all depends on how much money is in the kitty. No, they were always used and the coils always froze. That's why the custodians always blocked off the fresh air intake with plywood. Your system is a very typical school HVAC system. Hot water heat, maybe steam but in '67 it would be doubtful, unit ventilators with hot water/steam coils. Doubtful if there was any a/c back then. I doubt there was any timer as the schools were typically staffed with boiler operators/stationary engineers. Are you teaming up with any control companies, Barber Coleman, Johnson Controls et al? My bark is worse than my bite.

I really like this one, it's the BC 2011. If you talk for a few minutes it gets nice and warm - handy for winter inspections. The wife snapped a picture of me talking to one of our customers.

What application is the UV for? While you might be able to get away with putting the O/A damper to a fixed position down there it wouldn't work up here - we were at 2 degrees a few days ago. If you're looking at fresh air for something, like a school, control companies make a CO detector that will proportion O/A dampers based on levels. Again, if you're trying to do something like that up North then you'll need to interlock freeze controls if the heat will be hydronic.

I'm just getting around to addressing this post Mike - I'm sorry for the slight detour. Please do not use the term "wet line". Air Conditioning components have distinct names and terms. When we stick to these terms we are all on common ground. The suction line is always a "wet line" under the right conditions. A liquid line, under the wrong conditions, could also be a "wet line". Please, let us all agree to use industry standard names. Get a Carrier or Trane refrigeration manual Mike and commit it to memory. It's pretty easy to relate certain AC tonnage to piping size once you know the basics. If you feel that something looks fishy then it most likely is. For Boilerplate. The home is X square feet. This dictates an X amount air conditioning unit. This air conditioning unit needs X diameter piping to operate properly. I believe that the refrigeration piping is improper, x liquid line, x suction line and x hot gas line. Call a licensed/qualified HVAC company to verify and repair as needed.

Respond, don't respond, whatever. When I do is respond to a post I believe that what I'm adding to a post is accurate or just for a bit of humor to try and keep it light. If someone posts a response in a HVAC thread, that has accurately answered the question, then I see no need to interject. You, on the other hand, respond as if it is important to maintain quantity, even if it is just to affirm what the responder had to say, as if it is important to put your name out there. It's interesting behavior. I have no axe to grind with you Marc, I really don't. However I will stand toe to toe with anyone that starts to pontificate and expound as a self proclaimed expert and what they're putting, into type, makes little, or no sense or is inaccurate. I don't know a lot about many things but I do know HVAC. When someone posts nonsense I call it out. We are here to provide accurate information because others depend upon it.

Carry a set of OD calipers Mike. Look at Bains chart - it's good to go.

Is this a slab house with in the slab ducts?

A pound is a pound the world around. Suction line, liquid line, expansion valve/capillary tube and hot gas line. It's this statement Marc that makes zero sense: ???? I'm not even sure where to start.... I'm trying to make heads or tails out of the statement but it's difficult to say the least. Sub-cooling is the temperature below the corresponding pressure/temperature relationship for the given refrigerant. Are you saying that when the sub-cooling is reduced to zero? Then yes, that would be an undercharged condition. But not something that could be traced back to an undersized liquid line. The liquid refrigerant wouldn't immediately boil right after the expansion (constriction) device. If the refrigerant boiled right after the whatever device then there would be frost at the outlet and the superheat would be way high. Back to the original question though, can you even purchase a line set that is less than 3/8 on the liquid line? I don't think so. Do most HVAC technicians roll their own in the field with regards to the line set - no, I think not. Anyway.... awkward pause.... how about those Steelers?

I erased the remark. I have to quit stopping by here on Saturday nights. Me thinks it's something in the drinking water.

Vapor line, constriction device - where on earth did you come up with these terms? Superheat has NOTHING to do with the liquid line. Basic refrigeration 101 - liquid begins to boil off mid-way in the evaporator - the temperature above the corresponding temperature/pressure IN THE SUCTION LINE is superheat. Honest to God I've never read more gibberish in my life.

I wonder if one of 'dem 'dare infared thigamajigs would be able to find the leaker. You have one Kurt, would it work? Not saying you should repair the leak, just wondering...

As long as the leak is fixed you're free to worry about something else. []

I like my Blackberry - pretty minimalist but it serves the business side of things well - contacts, calender and the ilk.

I do crank and pot?!!! Eating Cheetos at the speed of light.

I've had pretty good luck with this:

That's the 2nd thing to go Darren.

Based on that poem we should start calling Mike "Rochester".

The ANSI number is 1990 as Marc said. The 0 is a slashed 0 = Ø as not to be confused with O (oh). In radio we use slashed Ø for the same reason.

And I'm probably guilty of that. Having said that though I still think that hp have their place. A Geothermal in Frostbite Falls? Now you've got my attention.

It looks good on paper.

A lot depends on location Mike. I'm not sure that would hold true for Frostbite Falls, MN.

Great clip Darren. That, Im sure, was a lot of fun. Were you there?

Is there a flue on that WH Mike? I see the plastic water sprinkler there but it looks like it's sitting pretty far back. With regards to the bollard - it looks like the thought was to protect the gas line.