frost on compressor

[godspeed]

HI,

I have a carrier primeline 69NT40-561 scroll compressor
compressor was covered with frost and pulled down temp at -15C only
supply temp and return temp sometimes equalizes
2 alarms flashes on the screen
alarm 67 and 66
anyone willing to share idea on this problem

thanks

[The Viking]

If the compressor itself is "covered with frost" then you haven't got enough superheat, check super heat and adjust/replace TEV/EEV/metering device as neccessary.

:cool:

.

[Brian_UK]

I see that your areas humidity is between 45% to 80%, with a -15°C suction temperature you would expect some frosting on the cold surfaces.

[nevinjohn]

Even -15 degree C suction temperature indicates that there is a chance of liquid refrfigerent being sucked in... Better check the load and refrigerent superheat, else you will end up killing the compressor.

[monkey spanners]

Air flow across evaporator? No load on a system will result in low superheat and possible frosting on compressor body.

[1mikeefc1]

Frosting on the compressor can also be caused by over charged with refrigerant.