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RJ

RJ

Joined on February 3, 2007

Last Post on April 12, 2014

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U.A.

@ January 9, 2008 10:03 PM in Pipe sizing(supply & return) for Carrier 42ck fan coil ac units

If your a member of the U.A. you can order this book on line (Hydronic Heating and Cooling.) It's got it all. $40.00. www.ua.org

air

@ January 6, 2008 8:03 PM in HELP! How to purge air from basement loop?

Always shut the pump off when bleeding air from any HW baseboard or terminal unit. If you dont have a purge valve ahead of the return shut off valve you will need to install one. Until you have time to make permanent repairs you can install a saddle tap on the baseboard piping, The type used for tapping into water lines to hook up ice machines on refrigerators.

Air

@ January 1, 2008 2:19 PM in hydronic system-air in lines

Look on your exp. tank for a 1 inch plug unscrew this, you will find a tire gauge looking fitting. Push in stem with your thumbnail, if water comes out you have a defective bladder and will need to relace bladder or tank. If you have air check with a tire guage you want 12 psig. If it is low add air, you can use a bicycle pump. IF you have the old style compression tank look for pinhole leaks at top of tank. Both would cause the relief valve to open, causing fresh water to fill boiler through the PRV (fill valve). also check the fill valve strainer if this is plugged or if valve is corroded and pipng to boiler is plugged it will cause valve to overfeed. Make sure the exp. tank is on the suction side of system.

piping

@ December 28, 2007 6:11 PM in Gurgling & Spitting Steam Radiator

check your header piping at the boiler, look in Dan,s Deadman,s book around page 54. If your pipng is wromg you may be entraining water up the main.

piping

@ December 28, 2007 6:10 PM in Gurgling & Spitting Steam Radiator

check your header piping at the boiler, look in Dan,s Deadman,s book around page 54. If your pipng is wromg you may be entraining water up the main.

@ December 28, 2007 4:52 PM in flue damper

damper: Johnson Controls makes one ,just install and plug into your existing igniton control. call 1-800-482-2778.

gpm

@ October 4, 2007 9:27 AM in gpm in pipes

On a water service line it all begins with the size of your water meter. For example, an 1 1/4 line with a 1 inch meter will deliver 20gpm at 50 psi static pressure, figuring a line 75 feet long. Call A.O. Smith tech. line for sizing tables. 1-800-527-1953.

header

@ September 28, 2007 10:41 PM in two pipe- air vent

refresh my memory about the dropped header principal.

@ September 5, 2007 10:40 PM in circuit setter

Agree with Paul, Save the grief. repipe using primary secondary loop with a primary pump and a pump for each boiler, top it off with a HEATTIMER logic control, this type of control will automatically rotate boilers.

cross connection

@ August 27, 2007 7:51 PM in Steam boiler feeds automatically (unwanted)

What ever you decide, it sounds like you have a cross connection, you should have a backflow device in the line between your HWH and the boiler.

Domestic Boiler recommendations

@ August 26, 2007 8:40 PM in Domestic Boiler replacement

Have a customer that wants to replace a 1,2oo,ooo BTU Teledyne Larrs boiler with a high efficiency (Domestic hot water) boiler. looking for a quality boiler.

wireless

@ August 7, 2007 10:48 PM in tstat

Be careful, wireless systems have problems in buildings that have alot of concrete with rebarb. Also buildings that have cell phone comm. equip. on roof.

pressure controls

@ August 7, 2007 10:38 PM in Refrigerant leaks

One of the biggest sources of leaks is the service valves you might have just taken your gages off of. Make sure all caps are tightly sealed. I just finished a job on 2 large Kramer ]freezers where both Cond. units had leaks in the bellows of the defrost pressure controls. A good leak detector will run about $500.00. Dont like the dyes, gets all over your guages and smells horrible. Pressure test with 150-200psig of nitrogen or use leak detector.

Balance valves

@ July 5, 2007 8:06 PM in Any reason NOT to always use full port ball valves?

The difference is Bell&Gosset or T&A or whatever make, are precision engineered valves, the smaller valves do employ ball valve construction but are designed different than regular ball valves. they also have have test ports to hook up a circut setter meter (B&G RO-4). the larger flange valves employ globe valve construction. A properly installed VAV system needs circut setters on the reheat coils to acheive a properly balanced system.

@ July 4, 2007 9:59 PM in Any reason NOT to always use full port ball valves?

I agree on the use of a red. port ball valve for purging. Using a ball valve for balancing is not ideal, leaving the valve in a partially closed position is not good for the teflon seal rings. Should use a balancing (circut setter). Agreeing with Paul P. Proportional control is acheived by using a globe style valve.

ampacity

@ June 29, 2007 10:15 PM in condensing unit breaker keeps tripping

I agree with others on dirty condenser coil. Check ampacity rating on unit. It should be listed on name tag. Most 5 ton units have an ampacity rating of 30 amps or slightly above. If your ampacity is in this range, you need to increase the disonnect to 50 amps, the breaker to 50 amps and install 40 amp FRN fuses. Your wire size should be #8. Additionally, on the electrical side, check for any loose wire connections and check compressor and fan contactors for burnt or pitted contacts. On the refrig. side, check your subcooling or look at the charge chart inside the unit cover. You may have an overcharge. If in doubt, reclaim and weigh in new charge. All equip. without a receiver is a critically charged system.

sizing

@ June 28, 2007 10:03 PM in circulator pump sizing

AT A 20 DEGREE DROP gpm can be found by dividing the heat load by 10,000. Example 79,980Btuh divided by 10,000 = 8 gpm. to figure feet of head (pressure drop), take your total length of pipe + 50% for fittings (TEL). than you need toapply to a milinch table. Chapters 3-5 in the U.A. Hydronic Heating and Cooling book will explain what your looking for. In a system with more than one circuit, figure the TEL of the longest circuit only.

Deck,s

@ June 28, 2007 7:21 PM in Opinions needed on porch decking materials

Try this web site it,s my sons Company www.mytimbercare.com

More traps

@ June 27, 2007 8:15 PM in steam traps

Have almost the same thing in a bldg in San Fran. I have an 80 year old one pipe system, no feed pump but the last contractor installed F&T traps numerous places in the parking garage. They are between the horizontal steam mains and the condensate return lines. There are many sways in the steam mains. I think they werw trying to get rid of water hammer at start up by installing the traps. I am just getting into this one,have alot of work ahead. I have presently bypassed all traps and am trying to figure out how to correct piping without tearing out walls in the bldg. Condo owners on the 1rst floor have been complaining about a tapping noise when the boiler comes on in the morning. Will keep all updated on what I find.

@ June 17, 2007 9:54 PM in Bell & Gossett Handbook, Second Edition, 1949

U.A. Hydronic Heating and cooling book. http://www.ua.org

Pneumatics will probably always be around.

@ June 13, 2007 8:04 PM in No changes are permenant...

I have been working with pneumatic control systems since I was an apprentice in 1973. I guess I am old school, but I still prefer pneumatics over DDC. As a U.A. Instructor I am finding the pneumatic class is a favorite of the apprentices. Alot of the older buildings are still working great with pneumatic controls.. A little calibration and oil/moisture free air and your system should last for years.

@ June 10, 2007 9:41 PM in leaking dielectric union

Valve off the line, open up the union and check the rubber face washer, it might have got pinched during installation. I agree, using a sweat by mpt (male union) is the better way to go.
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