Original message
| stonecold
 |  "Carrier RTU Compressor Problems"
, posted Wed 8 Jun 16:47  
this unit was cycling on and off, I hooked up gages to it and the suction side went down to 40 psi and cut off, got a little freon and added some but the unit did not seem to take it, I opened the high side manifold just a little and got some liguid in there and it freed up something and then my gages finally stabilzed, however the suction side was a little higher fluctuating between 74-70, but I notice a little noise from the compressor when it got closer to the 70 psi. Then finally the unit reached it's set point and shut off, later that day I rechecked and it was out on high head, got it up again and now the compressor runs for about 10 secs and goes out on high head. I want to start all over by pulling the charge and recharging it again but does anybody think that I might have some bad valves. What is the best way to find out bad valves in a compressor.
|
|
Replies:
|
| Coolzilla
| "Re(1):Carrier RTU Compressor Problems" , posted Sun 19 Jun 12:12
How about this what if the txv is pluged I would rebuild this or change and change the liquid line filter.Note: check superheat and don't overcharge or you will have a bad comp.
|
| Xenos
Webmaster 
| "Re(1):Carrier RTU Compressor Problems" , posted Wed 8 Jun 19:32:
You dont have bad valves if your tripping on high head.
Xenos.
The best way to escape a problem is to solve it.
[this message was edited by Xenos on Sun 19 Jun 12:16] |
| Freezone12
| "Re(1):Carrier RTU Compressor Problems" , posted Wed 8 Jun 18:46:
front seat the suction valve and see if the compressor can pull any sort of vacuum. 10" or more is considered good. less than that usually indicates worn valves.
sounds like your system might be overcharged. how high is the head when it trips? is the condenser full of trash?
carrier is famous for their sandwiched condenser coils that fill up with debris. an easy indicator for this is hot air coming off the unit horizontally instead of straight up from the fan. splitting and cleaning the coils may be in order.
is it really going off on high head or do you have a faulty switch?
if the compressor is noisy with only 70 psi suction, it's probably trashed. check your current draw when it's tripping.
you might do best by starting from scratch, ie replacing your drier, evacuating the system to about 400 microns and weighing in the correct charge.
and wash the condenser coils off while the vacuum pump is running.
_______________________________________
If it don't fit force it.
If it breaks it needed to be replaced anyways.
[this message was edited by Freezone12 on Wed 8 Jun 19:12] |
| | stonecold
| "Re(2):Carrier RTU Compressor Problems" , posted Thu 9 Jun 12:46
Thank you all for your replies, just to update you on my problem I ended up starting from scratch like you guy's sugested, however I could not pull all of the refrigerant out, I do not know if it was because it was so hot today and the pressure on the recovery cylider got higher that the system but the recovery unit could not pull all of it and I'm sure the tank wasn't full, anyways, I turned the unit on with what ever was left in the system and added some more freon 'till my pressures got to 68/275 and let it run, working ok so far but I still think that the compressor is a little noisy, I could not clean the coils 'cause there is no water supply on this roof and that might be the one problem for this unit.
|
|
|
