York YK Chiller Motor’s Stator with loose fiber wedges. Rubbing on rotor caused by loose fiber wedges. Bearing fluting caused by improper motor shaft grounding. Both issues were found through use of vibration analysis, which is an essential tool in predicting wear in chiller compressors and motors. We recommend taking vibration samples on chillers at […]
Thermetrics technicians disassembling a York Chiller for an overhaul repair in Orlando. The high speed thrust was found out of allowable tolerances during inspection. Teardown to determine the underlying issues was recommended resulting in this repair. Chiller’s bearings were found out of tolerance, impeller nose seal damage, and minor damage to the high speed gear […]
Thermetrics technician Bill Denney performing a tear down inspection of a YDTL-108 York centrifugal compressor suspected of internal wear. The low speed was found out of tolerance during a shaft seal change. This time lapse shows removal of the motor, coupling housing, and disassembly of the compressor.
Thermetrics Technician Albert Deblock rebuilding a 500 ton Trane CVHE Centrifugal Chiller with the assistance of two apprentices in the Central Florida, Orlando area. Chiller overhaul repairs like this require extensive knowledge of compressor design and specifications to reassemble along with rigging and special tools. Thermetrics technicians have performed dozens of overhauls on York, Carrier, […]
Thermetrics technicians performing an overhaul teardown on a 500 ton Trane CVHE Centrifugal Chiller at a Central Florida Orlando school. The rear bearing on the hermetic motor was beginning to fail, damaging the rotor shaft. The motor was sent out for machining and repair.
Cooling Tower – Annual Maintenance The Cooling Tower is the final device that is used to reject the heat energy absorbed from the building and transferred into the condenser water via the chiller. It also must reject the energy input by the chiller motor. The cooling tower functions to reject the total heat by taking […]
Chiller – Annual Maintenance The chiller is technically a heat pump in that it removes the heat energy from the Chilled Loop. The chiller motor inputs enough additional energy to pump the heat absorbed from the building into the higher temperature condenser water loop. It is central to cooling any large facility. When it is […]
(Photo Credit) Adam Hawkins, HVAC Instructor-Maysville Community Technical College-Montgomery Campus Let’s face it, here in Central Florida we don’t have much of a winter. Even the cool weather that we have doesn’t last very long. For the most part that’s a good thing except that it doesn’t leave much of a window to perform necessary […]
As included in most predictive maintenance programs, Insulation Resistance Testing is a essential metric in assessing the health of the conductors and motors driving HVAC & Chiller systems. This simple test may save the owner thousands of dollars in untimely repair costs if the test is safely measured, results regularly recorded and trending properly interpreted. […]
There are mediocre HVAC&R technicians then there are good HVAC&R technicians. Here are some skills and qualities possessed by good HVAC&R technicians. Of course there is the basic fundamental knowledge of physics that every good HVAC&R tech MUST have that includes thermodynamics, gas laws, chemistry, electrical theory and the ability to understand the effect one […]