Pressure Ratio (PR) as displayed on various screens in the chiller control is an expression of the ratio between the discharge pressure and suction pressure of the compressor. It is calculated based on psia, not psig. That is, it based on the absolute pressures, not the gauge pressure. The pressures displayed on the chiller control/… Leia mais PRESSURE RATIO (P.R.) – what is it?
If, after the initial ramp process, the compressor rpm´s increase dramatically, then the compressor goes off on a Fault, this may be a problem with the Inlet Guide Vanes not opening. A good indicator of an inlet guide vane problem is if the ¨ACTUAL KW¨ of the compressor is much less than the ¨DESIRED KW¨.… Leia mais COMPRESSOR RPM´s GO HIGH AFTER START
The inlet Guide Vanes are mounted in the suction of the compressor, after the suction pressure/ temperature sensors and just before the inlet of the compressor rotors. These vanes are essentially the same as those in a standard, centrifugal compressor. In a standard, centrifugal compressor, these inlet vanes are used to reduce compressor capacity by… Leia mais INLET GUIDE VANE OPERATION
There are two cooling solenoid valves that control compressor cooling located behind the side service cover in the upper left hand corner. These solenoids are connected to the backplane by plugs. There are LED´s above the plugs on the backplane that indicate when the solenoid is energized. In the TT300 and TG230 Model Compressors, the… Leia mais COMPRESSOR COOLING SOLENOID OPERATION
PART LOAD OPERATION ISSUES: One of the very strong features of the Turbocor compressor is its ability to operate at part load conditions. This is particularly true in multiple compressor units where, as the load reduces, one or more compressors can be staged off. It is always preferable for the Turbocor compressors to run part… Leia mais Part load operation
PREVENTING SURGE: Surge typically occurs when the compressor is operating with a high pressure ratio (PR), or when either the suction or discharge pressure change more rapidly than the compressor controls can adjust the compressor speed (RPM´s) and/ or inlet guide vane (IGV) position. Pressure Ratio (PR) is a number that is calculated based on… Leia mais SURGE – What causes it – How to prevent
Historically, the author has worked with technicians from Danfoss Turbocor, Multistack and Smardt, Canada, Smardt Australia and Smardt, Germany. The author is aware that there is a higher than normal percentage of compressor failures at certain sites and has discussed these failures with technicians and engineers from various organizations. The conclusion drawn from this set… Leia mais SURGE – What is it?