Joined on March 1, 2007
Last Post on February 28, 2014
@ November 15, 2008 8:26 AM in Common Venting of Condensing BoilersYou state, "Now we know I will certainly not get a blessing from Viessmann on this one, there is nothing in there literature that but I am thinking that says I can do this, but..." This is the perfect nightmare scenario. Maybe it will work, but is it right, long term? Build it to the manuf specs and you have their support. Do otherwise and the problems may go up and down the line. My suggestion would be to follow the manuf specs, make your profit on the job and leave with a system that you have confidence in and can defend your decisions. Common venting is almost always a compromise even when allowed. You end up with reversion issues that may have subtle effects but long term can impact the gear. I'm assuming that the reason you want to put in two units is to stage them. If so, and the 2" is the right size for the one unit you are going to pump it into 3" which has almost 3X the cross sectional area of the approved 2". Is the single unit operating alone 80% of the time going to be happy with this? If it works well, then good for you, but this is also how you create PITA jobs for yourself, the manuf and your client. Ask me how I know;)
@ November 15, 2008 7:47 AM in Large Scale domestic hot waterIN my opinion is to deal with the water quality issue. You state that you think the current equipment problems are in large part water quality related. Regardless of the type of material used in the newer system, poor water will rapidly deteriorate performance of high quality materials through scaling, etc and while you will be happy for a while, it won't last and it will end up costing more, sooner than you thought. Listing the equipment types in no way provides the information needed to size your system properly. How many apts in the building? What type fixtures and flow rates from those fixtures? In any hot water design you want to look at water conservation steps as a part of the design. Can you do that? It can have profound affect on the system design. Can you provide that information?
@ November 7, 2008 5:52 PM in Crawl Space Impacta crawl space ventilator you might look at. www.tjernlund.com
@ October 30, 2008 9:26 PM in Power venter service issuesWhen Tjernlund introduced the UC1 board we had many of the same call you are getting. The two timers were not exactly cooperating with each other. The fix was to have the aquastat call the SS1/II, have the prepurge on the venter operate and when satisfied release the call to the burner. Give Tj a call at 800 255-4208 for additional info
@ October 27, 2008 9:20 AM in DC pump for SDHWI know you referred to this in the 120V unit but generally on units which require a transformer I always prefer to see an outboard mounted $20 transformer rather than the PCB mounted transformer. They do it to cut costs but you end up replacing entire costly pcb's as opposed to replacing the $20 transformer
@ October 27, 2008 6:44 AM in DC pump for SDHW"Also consider a solar controller, even for a PV powered system, it really helps the amount of control." Assuming I move forward with this, what do you like for PV and SDHW controllers. For the DHW I still have a couple IE C-30's (remember those) from the 70's in the basement. Now if I can find the proper sensors. I know I have them. It is, where!
@ October 25, 2008 7:57 AM in Which is the best of the tankless water heaters (on demand)I'd like to talk with you about this. Would you please give me a call on my cell at 617 834-8751?
@ October 23, 2008 5:13 PM in DC pump for SDHWfor my house. I would be looking at a net metered system for the PVs but it would also be nice to have a dc pump for the SDHW system to run off pv power while the sun is out and the tank is calling. Suggestions gratefully received!
@ October 23, 2008 3:06 PM in Which is the best of the tankless water heaters (on demand)They don't need an anti-scald valve. Rinnai's are built to maintain +/-2f. If they exceed 6f above setpoint they will cycle off. You can check out the exiting hot water temp on the touchpad dispolay by hitting and holding the Down arrow and then hit on/off and release both. My experience is that they are vbery accurate. You need three things in an on-demand unit to make the correct temperature. 1) a flow control 2) modulating gas valve 3) a cold water by-pass to meter the appropriate amount of cold into the hot outlet line to precisely regulate th output temp. I know there are some on-demands which need a tempering valve, because they do not have these components, but Rinnai's do not.
@ October 23, 2008 7:33 AM in Which is the best of the tankless water heaters (on demand)As I represent Rinnai in New England, I'm frequently asked by distributors and contractors how many bathrooms, etc I can run with one Rinnai. The answer is that, well, that depends on what kind of fixtures you have. It is incredibly disconcerting to install one unit for a 2 1/2 bath house and walk in and see a cascading shower head with 4 body sprays and a handheld that are all running simultaneously. It is, shall we say, a scalding experinece! I always look at the flow/temp rise chart and say that an R75LSi will, at a 70f temp rise, make 4.3gpm, 24 hrs/day. That is a hard number and I have a solid base to work from. You can then start working the fixture flows around that, but again, you have a hard number to work from. If you have a higher or lower temp rise you will have a proportional increase or decrease in the output, but those numbers are on the flow charts. Using the hard number allows you to better explain exactly how they work to a builder or a consumer.
@ October 17, 2008 4:46 PM in Work coatsIt's about that time of the year. For the past couple winters I've had a Duluth Trading Post, Force Nine coat. It has been a great work coat. I wear it with a vest underneath and I good. I'm no longer working with the tools but lived in Carharts for years and basically always felt that by the time I had enough clothes on to be comfortable, I was so bundled up I couldn't do the work. I haven't worn it while stick welding but I don't do to much of that these days either. The Force Nine is an excellent wind stopper. Has a fleece lined collar, a long tail, plenty of pockets (Which damned pocket did I put that in?), gusseted shoulders for really good flexibility, etc. The one thing I haven't liked about it is that the two large flap pockets have so much velcro on them that you have to use two hands to open the pocket flap. A little razor knife fixed that problem. I have no affiliation with Duluth other than that of a customer, but they have been an excellent vendor in my experinece. YMMV, but this is a good garment.
@ September 16, 2008 6:44 AM in Plasma cutter?The plasma cutter will need significant amount of compressed air. Do you have a compressor available. If it isn't large enough you will wait and wait for it to catch up. As well, if there are a lot of deposits internal to the tank you will jsut get a lot of blow-back unless you have a powerful plasma machine. I'd start with a small angle grinder. You can get the thin cut-off wheels or go with the thicker wheels. If you cock one of the cut-off wheels it can come apart. I'd get my sawzall into the mix also.
@ September 15, 2008 7:10 AM in Laing electric heater circulatorswww.gothotwater.com
@ September 11, 2008 5:04 PM in Building a chimney ?mortar between flue tiles?You are correct that coal is very aggressive. One thing that iwll make it slightly less aggressive is to properly size the chimney flue. What is the breech diameter of your coal stove? Make your chimney liner the same size. I pretty much say that a masonry chimney is a marvelous architectural device but a terrible mechanical device. That has been my experience and I feel more strongly on it as time goes by. NFPA is the proper reference for you. You should have an airspace around the indder tile or SS liner The tile should be cemented with a refractory cement. Portland cement melts there, not from temperature but from acidic condensation. I would suggest a good quality CO detector for your coal unit.
@ September 11, 2008 6:02 AM in Propane pricingA good part of the equation in any liquid fuel purchase is the cost of the storage for the fuel. If the LP compnay owns the tank, which you effectively rent from them, they have to consider the cost/size of that steel in your yard. They have to size it adequately to supply you but not so large they loose on the cost of the steel vs your consumption. That balance typically gets you deliveries on a fairly frequent basis, which means that you are taking smaller loads at potentially higher cost. If I was heating with LP I would get a 500 or better a 1,000gal tank and bury it in the back yard. The more storage you own the more in control of the buy schedule you are. As well, you are less susceptible to short term supply disruptions and can negotiate better rates. BTW, a LP undergound tank does not have the same environmental problems associated with undergound oil tanks.
@ September 7, 2008 6:33 AM in Building my own copper coils in storage tankI'd throw a 50'coil of 3/4" soft copper into the top of the tank for DHW. If that is inadequate you can put two in parrallel.
@ August 31, 2008 6:37 PM in looking for instantaneuoswill modulate based upon flow and temps. It will work fine with the solar system
@ August 27, 2008 5:29 AM in third floor heat in dorchester, ma (pronounced dahhh-chest-ahh)Don't know the lay-out but these are perfect fro these applications. Simple to install, DV, 84%, modulating gas valve and blower. Check it out. at www.rinnai.us
@ August 21, 2008 5:41 AM in What was your first concert?I think it was 67. I got to help set-up the light show, which was about 50 individual slide projectors. This was back in the day when nothing beeped at you.
@ August 15, 2008 8:08 AM in Cell Phones (off topic)I've had Blackberry's, an early one. I've had a Treo 700W for the past couple years and I just last month got the iphone 3G, so I've had some use from it. I use the Jawbone ear piece, the best of them in my experinece, with my phones. Without the earpiece, I am a menace on the hwy. I'm a rep, on the 3000min plan and I use them. I had "push email" on my Treo and it was great. The same on the iphone, only greater. I do a lot of contractor training and with the screen size, resolution and speed the iphone is going to be my primary training tool, so when I speak with a contractor on the job or at the counter I can get excellent resolution for my lines web sites. For a contractor, I cannot imagine a better tool to get specs or troubleshooting info. Attachments load easily. I haven't put any music on it, but I hardly ever use my regular ipod. I'm so nosey that with head phones on I'm always afraid I'm going to miss something. Those who know me will attest to the fact that I am rather...dim! You might want to remember that to respond to some of my other postings. I need a piece of equipment that is easy to operate and to just deal with. I had a heck of a time with both the Blackberry and Treo. They were very capable machines. I was the weak link in the chain. The iphone is very well supported with online tutorials, but simple enough that I haven't needed to use them very much. Handling email is delightful on it. Photos can be emailed simply, which is nice when I visit job sites. The keyboard is taking some getting used to, but it is okay and if you want to compare it, try typing on a Treo. I could do better with the old full sized B-berry, but on balance, the iphone is better for me. I wish the keyboard would go into landscape mod. That would be a big improvement. I've been waiting, not very patiently, for a long time for a handheld device that I could really USE. The iphone is it. As well, in January I changed my laptop to a Mac. It hasn't crashed once and has been really nice to use. Interfacing with the iphone is just easy, and again, that is what I need. All the technolgy in the world does no good if you cannot access or understand it. In the final analysis, while I am admittedly dim, nosey, obviously opinionated and startling impatient I am also absolutely way to cool not to have one!
@ August 13, 2008 7:35 PM in Any thoughts on the 2 stage Thermopride Oil Unit?I tried to get some information on Riellos site prior to responding. I would think they would be howling about a two stage unit but I had difficulty getting anywhere on it other than finding the commercial sizes. Likely operator error. Two stage is vastly superior to single stage. I sold a few tens of thousand Rinnai wall furnace two stage gas units before they went modulating. Simply saying that you have two stage isn't adequate. The key to comfort and economy is how low the low range goes. If you have a 100kbtu max input the low rate will be best in the 30-40 kbtu range. Having a 70 and 100, for instance, while an improvement won't give the returns of the lower rate. What is the range on this. As for Thermopride, I'm sure they will do well with it and support it well.