rotary compressor efficiency test

[RBM]

Hello, can any one tell me if its possible to do a normal compressor efficiency test on a rotary compressor ie run with closed suction to check pumping performance. System is a hot water heat pump approx ten years old, havent had much to do with these things but suction seems a bit high and it runs longer than i would have expected.
Anyone help appreciated
Its a rheem system if that helps

[Grizzly]

Hi RBM
Which rheem system / Unit is it Only i have some rheem info.
Grizzly

[Grizzly]

I forgot to ask what makes you suspect the comp Dis. Valves?
Cheers grizzly

[RBM]

I forgot to ask what makes you suspect the comp Dis. Valves?
Cheers grizzly

Thanks for getting back, havent had much to do with these but suc pressure seems high (15 degrees 56 psi r134a) and seems to run for a long time. Its about ten years old and wondered if compressor worn as they must do big hours and must also run a decent head pressure as water temp is plus sixty degrees. Also air on evap to air off is only 4-5 degrees
Rheem Model no is 55132507/05