Joined on July 24, 2003
Last Post on March 8, 2014
@ November 17, 2013 11:22 AM in New Construction Tankless HeatingNot enough detail to see all components. Don't see a 30# PRV on the system side of the FPHX. It seems to be piped for a manual fill.
@ November 17, 2013 10:26 AM in New Construction Tankless HeatingAt least the system has a FPHX for system separation. Unfortunately, non-barrier tubing was used on the radiant side. That means the FPHX will need to be used when appliance is replaced.
@ November 17, 2013 10:12 AM in WIFI STATS ?The Honeywell Red Link is easy to integrate.
The new Viessmann B2HA condensing boilers have iPhone capability.
@ November 16, 2013 11:01 PM in ViessmannChris, here's the list I was looking at:
@ November 16, 2013 2:26 PM in monofloThis bathroom will require supplemental heating. The pex can do some floor conditioning, but it will never be warm enough with 80' pex. Not even close. Add a towel bar, wall panel or toe-kick convector. I wonder if plates were used?
@ November 16, 2013 11:45 AM in ViessmannI was surprised not to see them on the vendor list. On the other hand, the product is poorly represented in the NW but at least Ferguson picked up the line and has a decent sales force.
@ November 15, 2013 9:46 AM in How to control radiators in a 1 pipe hot water systemWithout re-piping the radiators to either a reverse-return or supply- return, you won't be able to add TRV's. Re-piping in heating season is not the best idea.
You can control the output by setting the heating curve on the boiler correctly, but will not be able to fine tune on a room by room basis without TRV's. Monoflo one-pipe systems don't have much leeway. If the radiators were sized incorrectly, it's hard or impossible to balance the system.
Re-piping is costly, and in a finished space creates inconvenience. If you want ultimate control you'll have to bite the bullet. If not, you'll have to see how your system responds by adjusting the heating curve.
@ November 12, 2013 12:34 PM in Mod-Con Boiler ConsiderationsFrom this month's Reeve's Journal:
@ November 11, 2013 8:48 PM in Radiant floor heat not heating properlyThe TT boiler needs an 11/4" primary loop using (1) circulator; any additional secondary zones are taken off the primary loop with closely spaced tees. The primary loop will be set for the highest temp required; zone temps are controlled by mixing valves for RFH zones. Each "takeoff" with closely spaced tees requires a separate pump. Use a variable speed pump for best results, especially if the zone uses zone valves.
See page 21:
@ November 11, 2013 1:23 PM in Viessmann low loss header substitutionWhy can't the company that sold the appliance provide one?
The smallest LLH sold has a max flow of 17gpm.
If the Caleffi hydraulic separator is used, the sensor can be strapped to the system supply outlet of the device
@ November 9, 2013 11:59 AM in Viessmann Vitodens 200 setupI'd connect to the system side of the LLH with 11/4" pipe with 11/4 circ flanges on Alpha pump. You could use 1" piping if you're confident of correct flow rates. If you do the TRV's, system balancing will be very easy. Place any Vitotrol thermostat in the ambient area. If the Vitotrol sensor is enabled and the room has a radiator with a TRV, the TRV must be left at "5" or fully open, or the thermostat will not respond accurately, nor will boiler water temps be as low as they could be.
@ November 9, 2013 9:49 AM in Viessmann Vitodens 200 setupI don't know if you're a homeowner or contractor, but the Vitodens 200 needs to be piped exactly the way the schematics show in the various examples given in the installation manual. The boiler works by sensing the outdoor temperature and the outdoor sensor is fully capable of running the system without a thermostat, providing the heat emitters have been sized correctly. If you have radiators, change the valves to TRV's while the system is drained down.
The boiler can be operated by either of 2 Vitotrol thermostats offered. Both can be configured to give feedback to the computer, if needed or desired. Conventional thermostats cannot be connected to the 200. The new models can be configured to an iPhone app.
The pump between the LLH and the boiler is usually a 15-58 Grundfos or equivalent and the system pump should be variable speed. I use the Alpha pumps. Pipe size is dependent upon required flow rate to the system. Without a heat loss, it's guessing to say the 2" main is oversized.
Your description of the existing system is from the late 1940's or 50's. Bringing the system into the 21st century requires a thorough understanding of how it works and how to pipe it correctly. If you take shortcuts, expect problems. If you do it right, it will deliver amazing efficiency.
@ November 8, 2013 8:30 PM in Solar Thermal in SeattleThanks for the kind words,Weez. It makes sense to datalog if you're spending the $$ to do this type of install. The data and flowmeter are quite pricey.
@ November 8, 2013 6:46 PM in Solar Thermal in SeattleCommissioned this thermal DHW system yesterday on a cold, wet rainy and soggy Seattle Thursday. Installing the tubes within the arrays was somewhat dangerous and slippery, having to walk the structural steel 6"x6" beams to place the end of the vacuum tubes into the collector headers.
The sun broke through as we finished the third array and was generating 80 degree water within 10 minutes. The outdoor temp was 47 and the piping isn't insulated yet. The project is the new NorthWest School gymnasium, auditorium and dining hall facility. The data from the system's BTU output will be displayed on the school's internet "Dashboard".
@ November 4, 2013 4:29 PM in New Solar DHW System for NW SchoolI'm not sure what you're asking to explain... The original drainback system used 12 flat panels, compared to 4 arrays. The drainback piping was designed from the basement level requiring the pumps to pump up 85 ft. The amp load was over 40 amps. This design uses 12-14 amps with all pumps running.
@ November 4, 2013 8:42 AM in New Solar DHW System for NW SchoolThe system will produce 40K btu's/hr at peak load. Due to the specific peak loads which are reduced in June-Aug, as the school only has 10% of students present, the racks were tilted to 45 degrees rather than 25. This lowers the system output during the strongest solar months.
As for cost, it was less than 1/2 the price of a drainback system that was originally proposed for the facility. I'd rather not share the specifics.
@ November 1, 2013 10:32 PM in New Solar DHW System for NW SchoolHere's some pics from a project we're about to complete and commission next week.
The 4 panel array has 120 vacuum tubes (Viessmann VitoSol 300T) in 4 arrays.
The storage tank is a custom AOSmith SS 250g tank. The solar tank will feed the (2) commercial water heaters located below the solar tank room. The pump module is a Viessmann Divicon with internal FPHX. An Onicon BTU & flowmeter will track data for the school's "Dashboard". BACnet interface by Viessmann.
@ October 30, 2013 6:57 PM in Knight boiler problemsThat the vent termination is cross-contaminating the combustion fresh air intake is certainly a big problem in this installation. A 12" x 24" separation is required by most manufacturers.
I'd be using PPE for the boiler flue, rather than PVC or CPVC.
We have over 100 Viessmann Vitodens installed in the field; most have mouse turd accumulation after 2 years. (316Ti stainless) We try and convince the owner to clean and service yearly. Most listen.
Seen one HX failure in a Vitodens 200 after 7+ years of no cleaning and service. There were at least 2 or 3# of debris sitting on the HX. Pinholes within the HX surfaces. Totally clogged!!
@ October 30, 2013 9:59 AM in Commerical Building OwnerIf the boiler is replaced with a mod-con, a polypropylene (PPE) flexible chimney liner can be used in either 2", 3" or 4" depending on boiler sizing.
@ October 23, 2013 11:42 AM in Press Tools - Ridgid vs MilwaukeeI have both the Rems and Milwaukee sets. Also have a Rems AkkuPress in 110v that we use for commercial jobs and don't have to recharge a battery. Don't think it's available anymore. Love the tools and pressfitiings. It's well worth the significant costs to "tool up" and forget about leaks, not to mention the labor savings and safety over acetylene and flux.
Rems was the first in introducing the presstools to N. America.
@ October 23, 2013 9:23 AM in We're falling behindThose contractors trying to find qualified techs have been aware of this for years. It was predicted 20 years ago and largely ignored. Tech skills aren't the only skills lacking....
@ October 15, 2013 9:29 AM in Mixing Valve QuestionMost boiler manufacturers will void their warranties if there is mineral or chloride content in water. You're best off to either fill the system with distilled water, or investigate what chemicals to add to neutralize and remove what can damage the appliance.