Joined on February 3, 2007
Last Post on February 26, 2014
@ June 23, 2013 7:22 PM in why would Compressor vibrate?I agree with part of the hands on diagnosis, but bad valves themselves would not cause extreme vibration in a semihermetic compressor, they are although a symptom of liquid floodback, maybe time to get a second set of eyes on this job, preferably someone with exp. in semihermetic and open drive compressors. It might be time to reclaim the refrig. and get any liquid out of the crank than see if you still have vibration
@ June 22, 2013 9:19 PM in why would Compressor vibrate?A few questions what are your line sizes, how much horizontal pipe, how much vertical pipe. how many 90s. Is there an unloader on compressor, If you have a 40RM style AHU what size are your TXVs, do you have cond. fan cycling, is your crankcase heater operational. is your AHU blower rpm set to match what your fan curve is calling for.
@ June 22, 2013 6:05 PM in Add Boiler Feed Tank Or Not?So how do we take this " Aother problem with modern boilers is that they contain much less water than the old clunkers they replace. This is the price we pay for high efficiency.
If the bldg is large, your replacement boiler may need a boiler feed pump in order to keep up with the time it takes for steam to make it around the old piping system and return as condensate.
@ June 22, 2013 5:24 PM in why would Compressor vibrate?sounds like liquid in the crankcase. check your air side , get a fan curve for the ahu, get some air side readings, check refrig piping sizes, dont put in another compressor until you check these.
@ June 22, 2013 12:49 PM in why would Compressor vibrate?pretty sure from last post it is a carlyle ( made for carrier equip.) semi hermetic. probably worn bearings or crankshaft, you can pull the heads and look at the pistons.( dont do this unless you have experience in compessor teardown ). chances are if the vibration is extreme you will need to replace compressor. than find the cause ( liquid refrig or oil slug ? )
@ June 20, 2013 7:12 PM in oil and freon leak - Carlyle Compressorprobably due to excessive vibation or cap tube wearing on other components, Someone jumpered switch probably due to refrig. floodback or excessive high refrig temps which can entrain oil out of compressor. could be alot of problems, ( poor air fow at ahu ? )
@ June 17, 2013 12:40 PM in the old man needs a handLook up refrig. line carrying capacity on yahoo, they have numerous sites, Mquay and Parker/Sporlan have a good PDF.
@ June 6, 2013 9:02 PM in High subcoolAlmost all systems have a critical charge unless they have a liquid receiver. I would follow Spence's advice, and also consider reclaiming refrig. triple evacuating, use micron guage, and than weighing in the charge, the charge listed on the cond. unit usually takes in account about a 25 ft. line set. ( check with the unit manufact.) All service people need to have a digital scale with them.
@ June 6, 2013 10:49 AM in Firebox temperature in residential natural gas powered steam boilerI have always used greenpatch -421 on commercial jobs 3200 degrees
@ May 29, 2013 6:21 PM in consultingThanks Henry what type of insurance would one want to carry, the same as a contractor ? maybe we can talk further.
@ May 29, 2013 10:31 AM in consultingI retired 2 yrs ago after a long hvac career, I was considering starting a buisness consulting on HVAC systems, I would specialize on older bldgs up to 12 floors with old pneumatic controls, old steam and hydronic systems and chillers, I did this the last 5 yrs of working. Any thoughts, do's or dont's would be appreciated
@ May 24, 2013 11:17 AM in cooling towersNeed more details, what brand is tower, how many floors is building, is tower on roof, where is pump. filling tower is done at tower,and sometimes can be filled in other areas depending on design. amount of air in system depends on how much water was drained. filling usually requires filling the sump than bumping the pump, sometimes running the pump for 30 secs or so, this may be a time consuming process, air will eventually get to top of tower piping, bring a 2nd man to help, having a garden hose as a secondary fill into the sump is helpful. before you start check to see if any drain valves have been left open on any floors, verify if roof and roof drains are in good shape, make sure pump is ready to oper. (valves in proper pos.) have your 2nd man check for piping,valve leaks when filling. The baskets are usually strainers depending on tower, leave them in untill you wash and clean out tower than clean them. Check to see if tower has adequate water treatment system. remember the wye straiers in the system may be extemely difficult to remove ( 2 men 2- 24 inch wrenches) but must be removed and checked.
@ May 23, 2013 2:50 PM in help upgrading 2 wire system thermostat!Typical heating/cooling single stage t-stat wiring is R (red) = 24volts with Rh and Rc jumpered on 1 transformer systems. W (white) = heating. Y (yellow) =cooling. G (green) = indoor fan. and in alot of cases there will be a common wire which could be black, blue or brown this would need to be verified. Not sure how your oper. heating and cooling with 2 wires. do you have a sep. cooling t-stat or control ? probably time to call a pro.
@ May 23, 2013 11:05 AM in cooling towersFirst of all you should get some tech. info on cooling towers to go over. When I was an hydronics instructor we would spend over 2 wks on towers. I would pull the strainer baskets and inspect them. Recommend cleaning strainers every 3 months on an open tower. Also doing a chemical cleaning of risers periodically. There is a misconception that opening valve on wye strainer will flush strainer, you need to pull the basket. I would also verify accuracy of guages and replace as needed. You should have full flow from downcomer pipe on top of tower if your system is filled correctly, give it some time to equalize. if you overfill it will run out overfill pipe, it may take some time to get the tower loop filled correctly. Guage pressure will depend on piping, strainer condition, bldg height, individual units and pumps. Need to get that fill line fixed and check the float. if you get a hold of the tower rep. they may help, BAC and Marley usually have good factory support. This would have been good in the commercial category
@ May 21, 2013 3:27 PM in low water cut-offthat scares me, residential should have the same or tighter code requiements in your area
@ May 20, 2013 4:37 PM in low water cut-offCurious, what boiler/mechanical inspector allowed this install without one.
@ May 16, 2013 10:12 AM in r22 condenserReclaim refrigerant, triple evacuate and weigh in correct charge. A digital scale is a great tool to have.