As technicians that work on a highly sophisticated and complex compressor, in the opinion of this blogger, we are severely handicapped by the lack of really in depth information in the area of determining causes of failures and indicators of potential failures. The Danfoss Turbocor training course is aimed at how to locate, isolate and… Leia mais Purpose of Blog
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?
Load Balance or Staging Valves are, essentially, hot gas bypass valves. They may be piped directly from the discharge of each compressor to the suction of that compressor or from the discharge of each compressor to the upper portion of the evaporator. On single compressor units, this connection may be piped directly from the condenser… Leia mais LOAD BALANCE VALVE/ STAGING VALVE
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
Indication of GENERATOR MODE in conjunction with BEARING FAULTS indicates a power disruption of some type to the compressor while the compressor was in operation. This is a normal condition when a power disruption occurs and indicates the compressor entered the generator mode (turned off SCR´s to disconnect compressor inverter from incoming power), as the… Leia mais GENERATOR MODE
IF you see this fault repeatedly, there is an urgent need to investigate, determine the cause and eliminate that cause. There are cases where this FAULT is not associated with compressor ¨surge¨ . However, seeing this FAULT repeatedly, over time, is a good indication of a serious issue. If you see repeated Front Radial Bearing… Leia mais FRONT RADIAL BEARING DISPLACEMENT FAULT
It is of critical importance to the long term health of the compressor that EVERY time a chiller is visited, or contacted via remote contact, there is a detailed review of the FAULTS and EVENTS logs from the chiller controller. Any ALARMS or FAULTS being displayed must be examined to determine of the alarm or… Leia mais Alarms and Faults
The installation of a check valve on the discharge of Turbocor compressor is mandatory to prevent the compressor rotating backwards on shutdown as well as pressure from the condenser flowing backward through the compressor to the evaporator when the compressor is shut down. While there is little to guide the service technician regarding the maintenance/… Leia mais Discharge check valve of compressor
When doing service work on the Turbocor compressor, it is Always good to note the level of condensation near the rear bell housing and in the area of the cooling solenoids and rear bearing power pass through plug. The amount of condensation experienced will depend to a large extent on the environment surrounding the compressor. … Leia mais Condensate on exterior of compressor / under side service cover
