stufus
06-09-2012, 05:43 PM
Hi Gent's
Have an issue with the above chiller , was looking at it with a work colleague.
One of the compressors was replaced;
Original - Mc Quay HSA3221QY11YB
Replacement - Halls HSA203Q511YA
We have checked this with Mcquay and were told the compressors are identical and the model numbers are different due to the manufacturer ,so that's fair enough.
The problem is this when we run the new compressor it runs sweet as a nut all the way up to 97% load.
The basic figures are this on R134A LWT set point of 7.5c . With microtech 2 controller.
@97% comp loading
LP= 2.1 bar / 1.3c
HP= 10.5 bar / 45c
Approach 12.4c
@100% comp loading
LP-1.3 bar / -6c
HP= 9.4 bar / 41c
Approach 15.5c
What appears to happen for want of a better description is that when the compressor stages from 97% to 100% it falls off a cliff and does not recover.
Is there a way to limit the loading on the compressor to 95% as it would be more than sufficient for the site.
But more to the point could the problem be with the spring tension acting on the slide not being up to the job.And the piston is traveling to far???
All and any suggestions welcome
Cheers
Stu
Have an issue with the above chiller , was looking at it with a work colleague.
One of the compressors was replaced;
Original - Mc Quay HSA3221QY11YB
Replacement - Halls HSA203Q511YA
We have checked this with Mcquay and were told the compressors are identical and the model numbers are different due to the manufacturer ,so that's fair enough.
The problem is this when we run the new compressor it runs sweet as a nut all the way up to 97% load.
The basic figures are this on R134A LWT set point of 7.5c . With microtech 2 controller.
@97% comp loading
LP= 2.1 bar / 1.3c
HP= 10.5 bar / 45c
Approach 12.4c
@100% comp loading
LP-1.3 bar / -6c
HP= 9.4 bar / 41c
Approach 15.5c
What appears to happen for want of a better description is that when the compressor stages from 97% to 100% it falls off a cliff and does not recover.
Is there a way to limit the loading on the compressor to 95% as it would be more than sufficient for the site.
But more to the point could the problem be with the spring tension acting on the slide not being up to the job.And the piston is traveling to far???
All and any suggestions welcome
Cheers
Stu