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I had posted earlier this year on a drive issue with a ycav wich turned out to be an scr trigger board!!!! Had the same failure a couple of weeks ago on the chiller sitting next to it. Anyone seeing...

Thank you very much , I apppreciate you sharing this info it makes the troubleshooting process alot easier !!!!!!

Thanks !!!!

etracyjr@sbcglobal.net

No, i do not have a manual for the drive itself!!!

scr diode modules as part of their "drive" yes they do, just looking for a little input from someone who has more experience than me on this paticular machine, or maybe actually run across this very...

Getting a low dc bus pre- charge voltage. I have read some of the troubleshooting for this drive and it appears it could be a problem with the scr's not firing or a shorted capacitor. Anyone with...

working on some york variable speed screw machines anyone with any service related issues on these machines !!!

You can put the charge in the condensor with an isolation valve on the dicharge of the compressor and liquid lines, you should have flow through the cooler while you are doing this also.{ to keep...

Took a call on a small trane precedent roof top roll out switch was open and would not reset. Changed the roll out switch lit off the unit observe the flame ok , the low stage burned at high 02...

carrier saw alot of problems with the expansion valves for the oil coolers, changed several myself hot oil splashing on the thrust bearing!!!!!

Thanks you i appreciate the help!!!!!!!

I have a trane model e 8 cylinder ! year old [replacement] lost oil pressure . 15 psi on start up then drops off to almost nothing. going to do a visual inspection this week. Does anyone have a pdf...

I have a 208/230 volt rooftop when the mercury was jumping out of the thermometer at 104 deg, the measured voltage was 190 volts at the unit. I'm curios 208 230 +/- 10% acceptable lower than the 208...

I thought that as well your trying to displace oxygen also to reducing the oxidation scaling on the inside of the pipe.????

That noise could also be liqud refrrigerant, your suction superheat should be rechecked with a thermocouple, with a dicharge superheat of 0 your suction superheat is probably lower than 7, iused to...

discharge superheat of 0 and suction of 7 is that possible you will get poor seperation with a low discharge superheat, but if the suction is at seven????

BLA BLA BLA BLA, PAY THE BILL MOVE ON , I CANNOT BELEIVE PEOPLE WOULD WASTE THERE TIME ANSWERING THIS POST

Any one change one of these looking for degree of difficulty, looks like you have to pull oil pump & cooler???????

if it's a newer home check out chinese drywall !!!

Carrier centrifugal with pic 2 control, this one sounds relativly simple, doing the winter maint on this machine and noticed a phase reversal fault nothing had changed elecrically, reset and back...

Why do we groung the secondary of a control transformer( stepdown transformer). Any veiws on this would be appreciated .

Thank you moose i hadn't heard of the strap on heaters , had thought of doing that though. I do not now what the first stage reg is orificed for, that is the propane dealers reg . I am learning alot...

The totel load is !million 6 hundred thousand , the line size leaving the tank farm is inch and one hallf,Tha line size is oversized for the load.The pressure leaving the first stage reg is 10 psi...

Two ,thousand gallon tanks, the tanks are icing up I would think that might be somewhat normal as the propane is vaporizing. All the calculations that where done suggest that the first stage reg is...

I have a job using propane to serve 4 rtu's and 4 unit heaters.New installation , the problem is the line pressure drops from 10 psi to 6 inches when i bring some load on. I have a first stage and...

oversizing heating systems ???? never heard of that ...

I have a two stage furnace in my home just installed beginning of fall. I have a single stage stat, amd allow the high stage to cycle based on time. I pulled out a lennox atmospheric burner at...

Measure the air temp !!! is it too high ??? Plugged ac coil, problem with zoning system, ductwork, Damper... Can you traverse the ductwork to check your airflow???? Is my gas pressure too high...

Have you ever seen the damage that can occur to personal property and body, when boilers are not serviced by qualified proffesionals. Call a pro!!!! This is not blowing smoke, this is people actually...

send it out for analysis, it sounds like you were the only person servicing it. Ive seen some synthetic oils used by people, royal purple i think was one.

I just installed a two stage 95 percent efficiency furnace, in my house ,most of my work is on the commercial and industrial side. I am curious as to problems with acidic condensate disposal, do...

Have a 19xrv that has been off most of the summer . Went to start it and getting drive fault overcurrent? motor never attempted to start ? the drive is a reliance ref cooled drive. I cannot even...

I would go with the 5 ton, and do your ductwork necessary for the larger system, it sounds like the old system could not keep up, good luck

could be, and if it is that simple if you wher to have somebody proffesional look at it , would most likely be a simple fix

16 stories i would have to assume you have a central chilled water plant in the building. So there also may be some type of ventilation air introduced also, wich could affect humidity lvels if not...

I would have a pro do the air balancing report for you, then continue with your troubleshooting. High suction could mean a few things, too much airflow, high return temps !!! , compressor efficiency...

anyone come up up with any interesting ways to disable the gps in your service vehicle ????

Thera are so many variables when it comes to ac / heat pump systems. I would be curious about why you would change euipment that is working. A system that runs continuosly on a hot and humid day is...

What are your operating pressures, if there were issues with contaminants in the system you could have plugged somthing up again, you can get perfformance data for the compressor you are using to...

have the contractor show you the leak, cooling coils can be repaired without being replaced sometimes. If for conversation sake the coil has leaked 3 years running, time to find out why!! Good luck.

I have changed motors from 1 day to 20 years maintanence is usually not the reason for failure , but it could be. What kind of motor protection do did you have and it it functioning properly. I am a...

you need to dig deeper, is there multiple fans on the condensor? fan speed control ? your suction pressures are to low, do you have semis with unloading? What is your superheat doing it appears you...

lot's of replies to this one! I don't think you could go wrong,either way unless They are the wrong size for 410a, volumetricly more efficient then r 22, can you flush properly to eliminate oil...

I use a robinair anolog micron gauge. It sounds like there is a leak, I install my gauge on the system by itself, if you yhink your gauges re leaking eliminate them from the equation or leak check...

Thanks guys this unit is off line as we speak until i remedy this problem, going back on monday !!

Thank you, when i pull it apart again i will do just that, it sounds like you have been down this road before. I appreciate the input!

I have a henry 1902 oil seperator changed the float assembly because it was pressurizing the compressor crankcase with discharge pressure. new float assembly prime the oil seperator, within 10...