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ClydeMule, I represent the compressor manufacturer. It is a long and detailed story so I will not bore you with the details. Unfortunately, due to proprietary issues, I cannot set up a meeting for you to see the installation. However, I am happy to discuss with you on the phone. I tried to...

ClydeMule, I am with you both. This is puzzling to me also. The mfg of the FD relayed the information to my customer, so it is possible (and very likely) there is a misunderstanding. The application is for commercial and residential cooling (test facility of 10 prototype units) in Las Vegas...

Excellent points Pennpoint!! I asked the same questions. The claim of oil plugged filter is coming from the filter manufacturer. The pressure transducers on either side of the filter indicated a high pressure drop in the filter. There were some copper filings (result of poor installation...

Our customer claims oil is plugging his filter drier. They are currently running a split system (10 ton nominal) with a rotary compressor and oil separator. The oil separator is rated at 98% efficiency. The system is running on R22 with Sunesco 3GS mineral oil. I have requested a sample from the...

We have a customer that is currently setting up a 10ton R22 cooling system using mineral oil. In future, they will be switching to R407c systems which use POE oil. Is it possible to run the R22 system with POE oil? What are the anticipated concerns? We would have an oil separator at the...

A Story from Moncton New Brunswick......... Union employee shows up at the office drunk and carrying a loaded shotgun. He is angrily looking for the CEO and CFO. Long story short...........he was convicted of carrying a loaded weapon with intent to harm. Neither intended "target" was...

I understand the major components of the refrigeration cycle should be sized to match the cooling load. What is the downside to using a compressor that is too big for the application or an evaporator for that matter?

MintJulep, It seems the more I know, the less I understand. I am certainly enjoying the discussion, nonetheless. I did look at some fan curves and you are correct regarding the stable condition of the fan performance. However, this trend changes with a prop fan for example. I looked at the fan...

Thank you very much for your input. I will investigate the prop fan data I have further to confirm the readings. Nonetheless, I appreciate your input!!!!

The same performance data provided for a vane axial or prop fan shows the static pressure increase, rpm decrease, air flow decrease and amp draw increase? This seems to contradict somehow. Is there a difference in performance between centrifugal blowers and vane axial fans?

I have the performance data of a small DC powered centrifugal forward curve fan. According to this data, the rpm increases and amp draw decreases as the static pressure increases. The voltage is constant at 13.5vdc. I would have expected the fan to run at full speed with no static pressure and...

Excellent suggestions!! Thank you very much.

I have converted the data collected from a 1 hour long test in my DAQ (data aquisition)system. I have collected 29 different data points. The default orientation of Excel is to put the headings across the top and the readings below this. Since I have thousands of readings this makes sense to me...

Thank you all for your replies.

Does anyone have a torque value table for brass fasteners? I am specifically looking for 5-16"-18 brass to mount a ground lug to the stud. I would like the preload and finish torque values.

Does anyone out there know of a DC power hermetic or open drive compressor that produces 6000 btu cooling?

g6679, thank you for your reply. We are running an oversize compressor(simply because it is all we have available at the moment) with a DC motor. In order to control capacity, we will slow down the (scroll) compressor. However, when the head pressure is in the 230psi range (110ºF ambient), the...

Will increasing the size of my condenser in a small system (.50 ton) reduce the head pressure or simply provide more subcooling?

Thank you to you all for your helpful replies. Sorry I was not able to join in earlier (exit! :)) I have just returned to the office this morning. Anyway, I tried some of the suggestions and they seemed to work. However, there seems to be some "embedded" objects in the drawing. Using...

I have two similar 2D drawings in AutoCAD 2000. Both drawings have been purged. However, one drawing is 300 kbytes and the other is 2500 kbytes. How can I clean up the second file?