Joined on February 3, 2007
Last Post on April 12, 2014
@ September 11, 2013 6:29 PM in What happened to all the solar thermal systems from 30-40 years ago?I remember back in the mid 1970s congress passed the energy tax act which allowed home owners a 40% or more tax credit on solar system installs and additional 15% on insulating , not sure what tax credit was allowed for commercial installs, this created an overnight appearance of solar companys, some legitimate some with non tested systems, the better systems still had the problem of storage when there was no sun. When President Reagan took office in the 1980s the tax act was dissolved. I remember solar companies going out of buisness with in days. The fact that some of these systems were never proven and that the life span of alot of solar hw panels is between 25-30 yrs may be the reason some of these old systems are being abandoned
@ September 10, 2013 2:42 PM in Side Entry Pressure - Temperature Gauge?Weil Mclain (Pex Supply sku- 510-218-099 )
@ September 9, 2013 10:16 AM in Air compressorsI would use what we used for years for pneumatic controls, Use a inline modular filter system, first a dirt filter than a oil filter (available at Graingers), Than a refrigerated air dryer, also a auto or manual blowdown for the air compressor tank.
@ September 3, 2013 10:37 AM in noisy belt driven Air HandlerCheck the motor sheave ( you call it a pulley ), is it ajustable, if so is it worn and grooved, this can cause noise.
@ August 30, 2013 5:36 PM in Gas boiler smellSounds like it may be a flue draft issue, is there fresh air into boiler rm , check to make sure the boiler rm is not in a negative pressure, neg. press. can be caused by bathroom exhaust fans and open boiler rm doors. check to make sure flue cap is in place and the correct type, on a lot of old boilers it took a few minutes with the main burner on to create a draft up the flue. If your smell goes away after boiler fires that indicates flue draft. check to see if there is any old soot build up, you may be smelling this, hard to tell without being in the rm. I would call in boiler pro
@ August 28, 2013 10:48 AM in musty odor from central ac systemStart at the evap coil, make sure the drain pan is clean, check that the drain is clean and everything is pitched and piped correctly (make sure there is a trap if needed ) there are products available for cleaning and treating pans. I would start there
@ August 21, 2013 11:17 AM in safety relief valve calculationmultiply your boiler horsepower by 34.5. 33,472 btus = 1 boiler h.p.
@ August 19, 2013 10:53 AM in Furnace accessRich is right, bathroom exh. fans can cause flue draft problems, i have seen it time and time again especially when a customer remodels a bldg and installs a restaurant with exh fans. The right mechanical/furnace room should have a high and low opening to the outside preferably 1 inch per 1000 btus each 1 ft. off floor and 1 ft from ceiling. these numbers will change if you have inside air combined with outside air. and a condensing furnace. check your local mechanical code or the international mech. code ( pdf on yahoo )
@ August 15, 2013 11:07 AM in Power Plant Picsgreat pictures , I love old plants and bldgs If you get a chance visit the Henry Ford museum in Dearborn Michigan, they have a small version of an actual power plant in the museum18
@ August 7, 2013 5:11 PM in Direct venting steam boiler?I have used Tjerlund in the past, they make a great product with excellent factory support
@ August 3, 2013 12:43 PM in high head pressuresTechman has the right idea, even though the cond. coil looks clean, washing out the coil with a hose and some coil cleaner will alot of times drop the head press. 15-25 psig, watch all that dirty water run out
@ July 30, 2013 9:09 PM in Leak sealOne way is to press test with nitrogen, check with liquid leak det. solution. Another way is to use a good electronic leak detector while unit still has a refig charge or add nitrogen with a refrig. tracer. There are dyes you can put into systems, I found they are messy and hard to get out of your guages,
@ July 30, 2013 3:12 PM in Leak sealHad a bad exp. used on a low temp Kramer hot gas defrost R 404 system , ended up with restrictions in system
@ July 26, 2013 5:34 PM in Fire Damaged Package Heat Pump UnitI would be concerned about any soldered connections on unit, most fires reach well over 1000 deg F. some solders have a melting point between 750 -1100 deg.F. Some carrier units had a fusible plug on the suction line set to blow if temp./press. got to high. There are several products to check condition of refrig. oil. also any residual smoke smell may be trapped in unit and duct insulation You should have a visual inspect. by a pro.
@ July 22, 2013 10:53 AM in low temp splitget all unit info 1rst a fan curve will help you determine air flow, chances are the cond unit also has ajustable air flow data available, you will need a good tachometer.
@ July 22, 2013 10:46 AM in circulators/pumpswater enters the center (eye) of the impeller from the suction side of the pump, on larger pumps with limited horizontal piping a suction diffuser is needed to direct water to the center. the centrifugal force created by the impeller imparts velocity to the water at the outlet of pump, creating a differential across pump. ( differential machine ) Its crucial that the suction press at pump does not go into a negative which will cause pump problems. I have additional info on reading pump curves if needed plus all that Jamie said
@ July 21, 2013 6:53 PM in low temp splitYou might want to do the detective work, make sure the units are the right size for the heat load in the bldg and are installed correctly before you spend to many unbillable hrs on the job, than get I.O.M.s and fan curves for units.
@ July 20, 2013 6:06 PM in low temp splitDucted condenser coils almost always cause above normal. press./temps.especially if they were added to the original install and are almost always dirty unless signs of cleaning are evident. I would recommend getting in and washing out the cond. coil with cal clean for a start, than looking at air flow issues. you may have to cut some access holes, always wash out coils starting from the side opposite the air flow. that low superheat reading sounds strange with your other readings, how are you measuring it.
@ July 20, 2013 12:32 PM in A question of design (circuit setters)That sounds like a tough one, can you make a detailed piping drawing. I worked on several changeover systems in the past and am familiar with the fan coil and mechanical room changeover process, Usually direct return systems would have circut setters on the fan coils.
@ July 18, 2013 10:27 AM in Blower pulley sizes ?Well I typed in this site and obviously I typed something wrong, just look up pulley sizing on yahoo or culver motor, sorry for the confusion
@ July 18, 2013 10:23 AM in Blower pulley sizes ?www.culvermotor.com/Engineering-Formulas/Pulley-and RPM
contact the unit manufact, and get a fan curve, which will assist you on the correct rpm for cfm needed.
@ July 10, 2013 2:31 PM in condensationAny time you are operating a DX or chillwater coil you will have some condensate if the unit is operating correctly and there is moisture present in the air stream, the higher the relative humidity the more condensate. check your cond. drain line and trap and flush them out if needed, make sure your trap and condensate piping are installed per unit recommendations.