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Joined on February 3, 2007

Last Post on August 22, 2014

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natural gas chart

@ December 6, 2012 12:36 PM in Something new.

here is the sizing chart


@ 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

taco wiring

@ December 4, 2012 4:35 PM in thermostat does not start boiler

the 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 Modutrol

forgot 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 Modutrol

This 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    for additional info

water feeder

@ December 3, 2012 4:59 PM in Very busy and loud feed water solenoid

You can install a press reducing valve ahead of the water feeder.   Bell & Gosset B7, or watts makes several types

primary secondary

@ December 1, 2012 6:37 PM in Unwanted reverse flow between tees

In 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 tees

send 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 analyzes

I 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 tees

I 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 controller

you 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 tees

looks 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+pneumatics

just 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+pneumatics

Most 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.
Rick S


@ November 27, 2012 2:34 PM in zone valve question

most hvac supply houses should stock them  Taco is a large manufact. of valves pumps etc

neg press

@ November 27, 2012 2:02 PM in High CO

Do 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.

flue size

@ November 26, 2012 6:12 PM in High CO

check 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.

system pressure

@ November 26, 2012 5:56 PM in zone valve question

I believe the old taco valves were a slow opening globe valve design ( heat motor ) I believe the mh valve use a spring and rubber ball device, I would check both manufacts. for pressure drop and flow data   There have been water hammer problems in the past if the wrong valve is installed.  I agree with Steve.

pipe size

@ November 26, 2012 5:35 PM in The Mystery nobody can figure out

check your gas main to boiler is it the proper size, per burner manufact. is any thing else on that line like domestic hw or hvac equip. ?  If your burner is 580 mbh than you most likely need around a inch and a quarter to inch and a half line depending on how far from gas reg.  also check gas reg make sure orfice is the right size. I would also check the burner plate for cracks or to see if it is warped.


@ November 25, 2012 10:30 AM in relace those gas valves ?

I agree, In my case i was referring to a 1050 mbh Peerless cast iron sectional boiler, after completely cleaning burners and sections,  I replaced all press.controls, valves, regulators,pilot assy,s ,  flame safeguard controls and electrical wiring. 
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