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Joined on February 3, 2007

Last Post on August 22, 2014

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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.


@ 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.


@ 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.


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

Try this web site it,s my sons Company

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.

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.

@ June 6, 2007 8:22 PM in Water flow through pipe

Is this line a city water line piped into a water meter?

heat pumps

@ June 3, 2007 10:35 PM in water source heat pumps

(1) Each heat pump should have a flow switch, a wye strainer and a circut setter. (2)Loop temp. should be between 75 to 78 degrees. (3)Make sure you have some type of Boiler by-pass or primary secondary system to keep boiler temp. above 140 degrees. Bell&Gosset has a good piping diagram. (4)Set flow rate at 3gpm per ton. (5)Water treatment- Treat sump of tower(fluid cooler) with algaecide and scale inhibitor. (get a water teatment company). (6)Control of loop temp. is accomplished by cycling tower spray pump,fans(reccomend a VFD). and the boiler.There is propably a new contol on the market as we speak. Try a company called HEAT TIMER. (7)Check with the tower manufacturer for P/M. (8)Keep the loop temp. at 75 and the air filters clean .


@ May 31, 2007 9:59 PM in Does this seem OK?

Better hope that kitchen has a makeup air/exhaust system that is creating a positive pressure in the kitchen or bye bye kitchen staff.

@ May 31, 2007 8:09 PM in Water flow through pipe

Bell & Gosset System sizer wheel. Check there Web SIte. Remember water flows when there is a differential. You stated 95 psig this would be your static pressure.


@ May 31, 2007 6:40 PM in Radiators

I came apon a 6 story apt. bldg. that has a 80 year old fire tube low press boiler , 1 pipe steam. while checking several units (now condos) I noticed the radiators were a typical 1 pipe set up with angle radiator valves. But Alas no air vents on the radiators not even a tapping for an air vent. Any one seen one of these.

@ February 3, 2007 10:15 PM in draft issue

Call Selkirk Co. They will send you a free flue sizing book. I would make sure you dont have a negative pressure in your boiler room. You may need to raise flue heighth do to long horizontal run.

High Stack Temp.

@ February 3, 2007 9:51 PM in Expertise wanted

I would check your flue design and your fresh air into boiler room. SELKIRK CO. has free trouble shooting info.
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