CVHE320 PURGE UNIT urgent

[mr hottstepper]

NOPE theres no exchanger on the condenser frame actually looked to see if it had one cause i had to do the same with a carrier XRV centrifugal last year but it was 134a not vaccum. i even inspected the rapture guard ,cuz that has a way of spoiling a good day.

No offense intended. I wish you the best of luck in figuring out where your problem lies.

NO PROB DUDE, i jus needed some insight in the low pressure side of the system cause i saw so many potential problems and i'm not that much of a low pressure chiller guy

[my63volks]

you said there was another trane of the same model/ser does it have the same purge to compare ? do you have a low pressure pumpout unit handy and a recovery drum..... have you leak tested not just by purge count? consider a new purge or a REDI PURGE sorry i keep reading post again , verify cond flow delta p, do a gpm calc & compare to design if you can get it

[a.desisto]

Have you let the machine sit and checked pressures? Possible someone added R-11?

[Phisher]

Check the purge valves and make sure they are open. Sounds obvious but someone could have serviced the purge and left them closed. Clogged orifice or closed pump out solenoid will cause the suction temperatures to remain low if the tank is full of air. When you brushed the tubes did you check them for scale? What's the saturated condenser temperature? The attached PDF has an trouble shooting guide that will show you were to take your readings and what they should be.

[Healey Nut]

NO PROB DUDE, and i'm not that much of a low pressure chiller guy

These are the key words in all of this thread

[mr hottstepper]

Check the purge valves and make sure they are open. Sounds obvious but someone could have serviced the purge and left them closed. Clogged orifice or closed pump out solenoid will cause the suction temperatures to remain low if the tank is full of air. When you brushed the tubes did you check them for scale? What's the saturated condenser temperature? The attached PDF has an trouble shooting guide that will show you were to take your readings and what they should be.

the valves were open, i headin back down to the sight tomorrow so ill be sure to use all the info i got thanks for the serv bulletin especially, and thank you every body else let you guy know how it goes tomorrow

[Trane_Dude]

Don't forget what I said. Inspect the compressor for worn out valves. additionally; it was common for the expansion valve to plug up with sludge. When this happens the compressor becomes a vacuum pump and it's toast as well. My vote (from 17 years at Trane) bad condensing unit. This is a long distance diagnosis mind you

[TheChillerMan]

the valves were open, i headin back down to the sight tomorrow so ill be sure to use all the info i got thanks for the serv bulletin especially, and thank you every body else let you guy know how it goes tomorrow

I'm guessing your in Trinidad and Tobago, West Indies? Trane Service in Miami has techs that travel the Caribbean. I suggest giving them a call and having a tech go down to check this machine out for you. They could probably have it figured out in under an hour. If you need the phone number send me a PM.

You could also call Trane Puerto Rico, they could send someone down also, but I don't know their level of expertise.

[mr hottstepper]

THE manual guage is reading the same. Purge compressor running its jus not pumping out which means there iss no air but still, the hi pressure issue is still there, this morning it was 92f, water temp was 51 dropped setpoint to 46 wen system loads pressure gradualy goes up to 16 and cut off on hi press cutout. i really dont hav much experience with the purge unit changed the purge drier yesturday incase it was saturated, at this point im totally lost

well i went back to the site today and met the unit purging on its own i loaded it up and condenser pressure is 13.5, 95% current and system is purging , .so according to the service bullitin "after you change the drier wait 72 hours to allow system to remove moisture properly",so the drier was definately saturated .. (i saw that a little to late) as luck would have it today is the 3rd day since i installed the drier. guys im so sorry for wasting your time ,but i thank you soo much for all the help and advice you gave me, if any of yall ever comin to d caribbean holla at me ill hook u guys up good ..

[mr hottstepper]

now its onto changing out the bearings on the other cvhe, any body got a manual for that by chance? although i think trane might send a bullitin with the bearings, but i wanna change the seals in it as well , can or if u dont have a manual can any of u guys tell me if the seal to impeller clearences are the same as the cvhf?

[mr hottstepper]

I'm guessing your in Trinidad and Tobago, West Indies? Trane Service in Miami has techs that travel the Caribbean. I suggest giving them a call and having a tech go down to check this machine out for you. They could probably have it figured out in under an hour. If you need the phone number send me a PM.

You could also call Trane Puerto Rico, they could send someone down also, but I don't know their level of expertise.

i cant seem to private message ill e-mail u

[milkyway]

This was / is a good thread!!

1.Condenser pressure 116*= 13.5psig

2.So by leaving water temp converted to psig 96*=4.6psig

3.Equals = 8.9psig



I did not realize that leaving water temp was used
to determine if air was present.

[jayguy]

This was / is a good thread!!

1.Condenser pressure 116*= 13.5psig

2.So by leaving water temp converted to psig 96*=4.6psig

3.Equals = 8.9psig



I did not realize that leaving water temp was used
to determine if air was present.

Leaving water temperature is not used to determine if air is present. Leaving water temperature is used to determine condenser approach. 'Higher condenser approaches' means some things and 'lower condenser approaches' mean other things. Low condenser approach means that the tubes are not particularly fouled and that you have good heat transfer. If you have good heat transfer, then you probably aren't low on charge and that your high condenser pressure is probably due to air in the chiller. If you had high condenser pressure AND a high condenser approach temperature then (perhaps) you are low on charge or your tubes are fouled. Remember that all equipment is in the process of degrading in performance. They all have some degree of fouled tubes, non-perfect charge, non-condensibles, etc. You START with the biggest problems and work down until you get a satisfactory piece of equipment.