Joined on February 3, 2007
Last Post on February 26, 2014
@ December 8, 2012 3:00 PM in Badly plugged sectionsI agree I would get someone familiar with your boiler to determine how to clean it I would also get someone with a strong background in boilers who can do a complete flue inspection ( proper flue size, fresh air,combustion air ) and a combustion analysis of the burner. I would also put a co monitor in the boiler room. Be carefull using any chemicals in boiler rm. especially if there is other gas or oil fired equip.in room.
@ December 8, 2012 11:32 AM in T-stats in Apts...White Rogers makes a commercial t-stat that allows you to install 3 remote sensors, you can set priority on different sensors sensors are sold seperate, this is a 24volt heating cooling t-stat, in your case dont wire up cooling. I used in a 3 story bldg, I was controlling 1 reznor M.A unit, I had the t-stat on top floor and had the keypad locked out, I set mine up to take an average of all floors as the controlling set point. sorry dont know part # check with controlco in San Fran. 415-647-9445.
@ December 7, 2012 11:21 AM in pumps2- grundfoss UP-26-99BF bronze pumps unused in boxes less than 2 yrs old make offer in the Sacramento CA area
@ December 6, 2012 11:37 AM in Something new.I have a good chart for figuring nat. gas pipe sizes let me know if you need one.
@ December 6, 2012 11:32 AM in Something new.How do you get to bookmarked threads might be my laptop
@ December 4, 2012 4:35 PM in thermostat does not start boilerthe fastest way to solve this would be for you to go on yahoo and type in taco zone valve wiring there are numerous schematics etc, make sure your wiring is correct and connections tight. Be careful disconnecting the 3 wire actuators, before taking off of the valve body disconnect the 24volts for about 5 minutes These old valves had a heat motor read caution notes
@ December 3, 2012 8:17 PM in Honeywell M9185D 1004 Modutrolforgot to say that when testing actuator external wires on r.w.b terminals should be removed , only 24v wiring hooked up. also t991a is a modulating temp. control. i recommend that you install a manual potentiometer to test motor, honeywell makes one, not sure of part no.
@ December 3, 2012 7:10 PM in Honeywell M9185D 1004 ModutrolThis is a series 90 actuator (135 ohm ) testing should be done with actuator disconnected from valve linkage. r-b opens valve like you did, jumpering r-w should close valve (rotate the opposite way) or install potentiometer per instructions rotating dial on t991a will add or take away resistance to motor circut, If motor does'nt move and there is no voltage drop to your 24 volt supply I would recheck all connections, If this does'nt work I would replace it, not alot to troubleshoot on inner motor workings, make sure your valve is not bound up which is the biggest cause of actuator failure You might consider replacing the valve,actuator and linkage contact customer.honeywell.com for additional info
@ December 3, 2012 4:59 PM in Very busy and loud feed water solenoidYou can install a press reducing valve ahead of the water feeder. Bell & Gosset B7, or watts makes several types
@ December 1, 2012 6:37 PM in Unwanted reverse flow between teesIn most commercial systems Tel. Larrs, bell&gosset the primary loop (system loop) travels around the bldg to the individual terminals, the primary (system loop) includes the expansion tank, main pump,and air seperator. The secondary loop is usually where the tees take off and where the boiler is piped into. the secondary loop adds heat to the secondary as needed. The terminology is often flip flopped in residential and light commercial radiant systems calling the primary-secondary and vise versa. the individual radiant zones can be there own secondary loop off the primary loop with there own pumps, once again drawing would help also have pumps been sized forTEL and or press drop of system.
@ December 1, 2012 4:46 PM in Unwanted reverse flow between teessend a detailed piping drawing and we can get to the bottom of this Taco has a website that used to have some good radiant heat info. Usually the boiler is on the secondary loop.
@ November 30, 2012 2:43 PM in Combustion analyzesI always liked the Testo brand I think it was the 325 mod. which came with a printer needs to read nox
@ November 30, 2012 11:01 AM in Unwanted reverse flow between teesI agree with all, remember the law of the tee, what goes in tee must come out, still would like to see a schematic, you need some circut setters in your system to get it balanced.
@ November 29, 2012 8:48 PM in Honeywell controlleryou need to check your flame current, you will need a meter that checks microamps, there is a jack on the ra890 to plug in your meter you need a min. of 1.5-2 microamps, if you dont read this than many possibilities dirty or rusted pilot assy. cracked flame rod porcelain, low gas press, cracked or warped burner plate. to be safe call in someone who is good with this type burner, Power flame has a good tech help line also some supply houses can bench check your ra890
@ November 29, 2012 8:24 PM in Unwanted reverse flow between teeslooks like your primary loop is piped into your boiler, can you draw a schematic showing pump flow direction, also recommend balancing valve on secondary loop as well as petes plugs on supplys and returns.
@ November 29, 2012 6:43 PM in Hurst steam boilers+pneumaticsjust as the phrase dead men of steam we can use dead men of pneumatics, the men who are good on old pneumatics are slowly disappearing I would look at it for you, I live in colorado. i am a retired Steamfitter.
@ November 29, 2012 11:55 AM in Hurst steam boilers+pneumaticsMost all old pneumatic systems failed to heat, when air press. was lost bldg would go to full heat. It is probably normal for the boiler relay to bleed off on a call for heat, The 3 way valves on the wall are probably for day night changover. day 15 psig, night 18-25 psig. or summer winter changeover, summer 15 psig, winter 18-25 psig. check bldg thermostats to you which system you have. Are the tanks on the wall connected to the pneumatics ? Some of the old systems had air compressors with little air storage so external tanks were used.
@ November 28, 2012 8:43 PM in Pneumatic controlled heating system changeout ( Ron Jr. )I continued to work on large pneumatics in 2011, I retired in 2012 after 38 yrs as a steamfitter and 5 yrs as an instructor for pneumatics and hydronics, I saw pneumatic controls go from the only control system in the 1970s to almost being obsoleted, I designed some retofits where I would use mh T775 and Johnson 4-20 ma controls to interface with pneumatic valves,relays and actuators If anyone needs pneumatic help let me know.
@ November 27, 2012 2:34 PM in zone valve questionmost hvac supply houses should stock them Taco is a large manufact. of valves pumps etc
@ November 27, 2012 2:02 PM in High CODo you have a sealed boiler rm ? check at the boiler rm door do you feel air being pulled from rm, if so get door to seal, also check this fan that was installed for fresh air, make sure fan rotation is right, make sure this fan and fresh air inlets were sized per code. There is a company called Selkirk that can provide flue and combustion air tables. after shutting all external air moving equip.should only be a minute or so.
@ November 26, 2012 6:12 PM in High COcheck your flue size per boiler specs, also as Phil said look for negative press in and around boiler rm. look for bathrm or kitchen exhaust fans. they may be on intermittenly.