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RJ

RJ

Joined on February 3, 2007

Last Post on July 18, 2014

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pump

@ July 22, 2013 10:46 AM in circulators/pumps

water 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

split

@ July 21, 2013 6:53 PM in low temp split

You 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.

t.d.

@ July 20, 2013 6:06 PM in low temp split

Ducted 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.

balancing

@ 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.

sizing

@ 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

sizing

@ 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.

condensation

@ July 10, 2013 2:31 PM in condensation

Any 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.

U.A.

@ July 9, 2013 11:35 AM in Desperately Need Help

The United Ass. of plumbers and steamfitters has its national training center at Washtenaw college in Ann Arbor,  check into contacting someone there.

meter

@ July 4, 2013 4:02 PM in case grounded compressor?

what setting is your meter on,   I recommend getting a megohm meter and re checking.   always check the elec circut.  for loose wiring or burnt comp. contactor contacts before condeming compressor. if it is single phase it could be a bad capacitor.    If your not getting contiuity to ground it may not be grounded

carlyle

@ July 4, 2013 1:41 PM in carlyle o6e compressor failure

re read all the past posts that were sent to you and follow all recommendations

unloader

@ June 29, 2013 12:08 AM in unloader

Unloaders dont regulate oil they are a capacity control   look up suction cut off unloader or   www.xpedio.carrier/idc/groups/public/documents/...     sounds like you have an oil return problem which someone misdiagnosed, so they kept adding more oil.   at this point i would recommend that you take a class on compressors at your carrier dealer and recheck the design of your system  (piping sizes, unit sizing and air side design

refrig

@ June 28, 2013 9:27 AM in Bad TXV ?

What type of refrig,  walk in box or under counter,  what temp are you trying to maintain, are the derfost heaters oper.  what type control , low press. control or liquid line sol. valve, door gasket condition.  has someone been leaving door open.

evac

@ June 26, 2013 6:53 PM in how to evacuate a precharged unit

I am concerned you are a tackling such a large job with what I think your saying is no field exp.  for your safety and others have a journeyman show you the proper procedure

cond fan motor

@ June 26, 2013 3:21 PM in Condenser Fan Question

I am assuming the unit is in cooling.   i would wire the motor for high speed, check that your motor amps dont exceed rated amps, check rotation.  freezing of suction line outside unit and at compressor would indicate other problems, possibly air side issues

horsepower

@ June 25, 2013 6:21 PM in Condenser Fan Question

It all goes back to the size of cond. fan blade, a larger diameter blade would require a larger horsepower motor,  the 2 speeds should indicate 2 different rpm's, say 825 and 1050,  a larger horsepower motor can take the place of a smaller motor as long as the wiring and etc is big enough,  check the rotation on the motor and motor amps,   remember air flow restriction (dirty cond. coil ) on a propeller blade will increase motor amps,  can you provide all motor data and a picture

reservoir tank

@ June 24, 2013 4:46 PM in Add Boiler Feed Tank Or Not?

looks like this si a hydronic compression tank,  check with the local city boiler inspector,they may require a tank made of schedule 40 carbon steel

vibration

@ 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

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.

page 75

@ June 22, 2013 6:07 PM in Add Boiler Feed Tank Or Not?

sorry that would be    Another

page 75 The Lost Art of Steam Heating

@ 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.

vibration

@ 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.

vibration

@ 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 ? )
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