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RJ

RJ

Joined on February 3, 2007

Last Post on April 12, 2014

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gas press.

@ December 23, 2012 2:34 PM in gas lines to boiler and other appliances

the outlet press. for natural gas  from most gas co. regulators is usually about 1/4 psig  (7 inches water column  w.c.)   regardless of the inlet press.  outlet press. over 1/2 psig can damage most diaphram gas valves

flue

@ December 23, 2012 11:30 AM in fluctuating draft with power vent + power gas

what about that single wall flue pipe ?

good product

@ December 22, 2012 10:23 PM in thankyou fan in a can.....

 have been using this fan on my commercial jobs for years   in some cases i have 2 . some basements just dont have enough space for gravity fed ducts for combustion/fresh air    Field controls also makes a good barometric damper

gas

@ December 22, 2012 8:54 PM in gas lines to boiler and other appliances

 Dont confuse psi with inches of water column ( w.c.)   most residential and small commercial bldgs have low press. gas service to the bldg regulator  ( 14 inches or 1/2 a pound )    5 psi could be considered medium press. gas, you could have med press.  you should contact your gas co. to get this info and have them sign off on this piping, looks a little sketchy to me.

cfm

@ December 22, 2012 11:21 AM in suppemental heat

As I stated carrier and other manufacts. use this cfm data.   I Installed , started up and serviced hvacr euip. for 38 yrs  I agree for system design do a heat load,  but in alot of cases when your on the job not in the office this rule of thumb gets you to a starting point.    I came from your fathers day   when a service man was expected to know all phases of this trade,  Lets appreciate what we have taught the younger guys,  without them this trade would be in trouble

piping

@ December 22, 2012 10:44 AM in need help reading the pressure gauge

I agree with Bob   should be repiped in blk pipe with cast iron fittings to allow pipe movement ( see swing joints )  the way it is now there will be pressure against the boiler sections causing problems

clocking

@ December 21, 2012 2:29 PM in Gas meter

Go on yahoo look up clocking a gas meter   good stuff

lwco

@ December 21, 2012 11:32 AM in LWCO Clogged

Lwco's need to be blown down weekly per  most manufact. ( Mcdonnell Miller ).  Strainer basket assy should be cleaned or replaced at least twice a year if not more often. Once a year I will completely take apart lwco and clean out bowl and flush out blow down valve.

combination

@ December 20, 2012 10:42 AM in auto feed system - necessary?

Many cities require redundant low water cutoffs on commercial boilers one of them being a lwco feed valve combination.  ex. ( mcdonnell miller # 51 ).  Yes a boiler could dry fire if any lwco is neglected.  Mc Miller recommends blowing down the lwco weekly.   I found when doing boiler P/M 's that if customer could do it themselves every 2 wks that was good.  I would clean or replace the strainer basket every 3 months and completely clean entire unit yearly especially the bowl float assy.

Merry Christmas

@ December 19, 2012 8:35 PM in Merry Christmas

Merry Christmas to all         remember John 3:16

power factor

@ December 19, 2012 8:28 PM in What watt!

My understanding is that  (power factor correction ) is not used in resistive loads, In a 3 phase suppl. heater circut we add the following      amps  = KW x 1000 divided by volts x 1.73.   On page 17 of the Ugly's book I believe they are talking about inductive, reactive loads.  (motors , transformers )   I always like to get several sets of eyes on all questions.

car ac

@ December 19, 2012 11:23 AM in Tips to repair Car Air Conditioners

Dont forget to change the cabin filter       It is fairly simple to get to on newer cars.   there are some good videos on you tube

vav

@ December 18, 2012 3:12 PM in Dual Duct VAV boxes - Inlet Pressure

Contact your local Trane rep. ask for  literature and request a I.O.M. (manual)  also on yahoo look up   HVAC units-Varitrane dual duct boxes.   you will need some training on this one.   may need  Rover/comm 4 software and Rover tool

pressure

@ December 17, 2012 2:26 PM in furnace firing issue

You need a minimum of 5 inches water column to inlet of most gas valves and 3.5 inches to burner on most  furnaces,  these setting can change if you have a 2 stage valve and on commercial burners. most diaphram style gas valves depend on this 5inch to 3.5 inch pressure drop to operate correctly.

Gas

@ December 17, 2012 1:05 PM in furnace firing issue

Have  a licensed Hvac contractor check it.   could be low gas press. you could start with your gas co.   alot of them dont charge to check your furnace.

gas press.

@ December 15, 2012 6:23 PM in Honeywell random fault lockout

You need to maintain at least 6 inches w.c between the reg on the boiler and your parrallel regs.  while the burner is operating.  ( where the pilot piping is attached to the gas line )   7 inches would be better,  if you cant burner wont oper. properly.   have the Gas co. meet you at the job site

rule of thumb

@ December 15, 2012 5:29 PM in suppemental heat

400 cfm for cooling and 500 cfm for heat pumps is data used in Carrier ht pump and air balance manuals, as well as many other unit manufacts.   the other data came from SMACMA.   I agree a 10 degree temp rise is'nt much but some of the jobs I looked at in northern CA had no suppl. heat and barely had an electrical service to the bldg big enough to support 40 amps to each unit, so a 10 degree rise was better than nothing. I do know about all the stages needed in colder climates as i started my career in Denver in 1974 and also worked in SF for 20 yrs.

vav

@ December 15, 2012 4:54 PM in Dual Duct VAV boxes - Inlet Pressure

Are they DDC boxes or pneumatic.   minumum static is critical, If you want vairiable air volume your boxes will need velocity controls, do they have a hot duct and cold duct run to them,  need a little more info.

pumps

@ December 14, 2012 10:39 AM in pumps

sold    Dan can you remove post      thanks

pump

@ December 13, 2012 5:35 PM in Circulation pump vibration noise?

Get a tech to check for pump cavitation (air in system getting into pump )  beftore replacing pump.  this is what is called a maint. free pump, no coupler.  If the pump is within a year old  it should still be in warranty.

flooding

@ December 13, 2012 3:32 PM in One Pipe Steam System Flooding

Did they check fill valve ?

coupler

@ December 13, 2012 3:27 PM in Circulation pump vibration noise?

could be a loose or broken coupler if its a B&G series 100 pump or taco equivalent , or a bad motor or pump bearing,  it most probably will get worse.  Better have a pro look at it.  have the pump brand, mod, serial # and motor horse power  on hand when you call.
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