Bruner HomepageHome      Contact BrunerContact Us

Tag Archive for Maintenance

Project Spotlight: Miranova Helicopter Lift

In the autumn of 2011, Bruner technicians performed routine maintenance on seven make-up air units at One Miranova Place in Columbus, Ohio.  The seven make-up air units providing fresh air to the kitchens of over one hundred condominiums were found to be unsafe for operation, due to cracks in the gas fired heat exchangers, which could allow carbon monoxide to enter the living spaces of the tenants.

To provide a temporary repair, Bruner welders sealed the leaks, allowing the units to remain operational until new make-up air units were available for installation.  These repairs, while temporary, allowed the Board of Directors at Miranova time to investigate several options for a long term solution.

After receiving several proposals, the Board decided to accept the solution provided by the Bruner Corporation.  With advice from Prater Engineering, the Board accepted the offer from Bruner to remove the aging make-up air units, and install seven new “Aaon” 100% fresh air make-up air HVAC units.  The new Aaon units, with technological advances not available 15 years ago, provide increased energy efficiency and extended longevity.

One of the major obstacles facing Bruner was the difficulty in removing the existing units and mounting the new units to the rooftop of One Miranova Place, nearly 340 feet above street level.  After consulting with several crane companies, it was determined that the most economical means of replacing the units would be to utilize the services of Midwest Helicopter, a company specializing in lifting equipment inaccessible to conventional hoisting systems.

In preparation for the helicopter lift, Bruner technicians, led by Bob Hoffman and Don McNeal, [John Magill and Brian Caton also] spent many hours to assure that all components were able to be safely and efficiently lifted to and from the building.  Their efforts paid off, as the total time required to remove seven units and mount seven new units was under one and a half hours, nearly a fifth the time required for conventional hoisting methods.

With an extreme focus of safety and customer satisfaction, Bruner has once again demonstrated our commitment to excellence.  Even during this potentially dangerous helicopter lift, the interruption of business to Miranova One (condominiums) and Miranova Two (office building) was negligible.

Hats off to the Bruner team for making this event run so flawlessly.

 

Tips from Contractors for Long Compressor Life

In order to keep an air-conditioning system running efficiently, it is crucial to keep the compressor in tip-top shape.  There are a few vital areas to take into consideration when focusing on the life of your compressor– troubleshooting, maintenance, and tools. Be sure to follow these tips to keep your air-conditioning system running efficiently, especially in the up-coming warmer weather:

Troubleshooting Tips:

  • Keep your condenser oil clean. A dirty condenser will cause higher than normal head pressures, which creates heat and will cause your saturated suction temperatures to be warm, causing compression failures.
  • Check superheat settings. Too low of superheat may cause liquid flooding, which is bad for the compressor.

Maintenance Tips:

  • Test electrical integrity. If you question any readings- get to the terminal to retake the readings. However, before you go and pull wires off, carefully inspect the terminals and the surroundings for any burn or fatigue signs. If an area is showing signs of terminal failure or burns, proceed with extreme caution.
  • Be sure to check: the capacitor, superheat, subcooling, crankcase heater, contractor voltage drop, and the disconnect condition
  • Lubrication is Key. Be sure to have enough oil to make sure the system is not flooding back and diluting the oil. Test the oil safety control, if there is one, by verifying the pressure setting and checking the timing.
  • Well-Trained Technicians

Tool Tips:

  • Measure compressor winding insulation integrity using a megohmmeter
  • Measure refrigerant pressures and compare them to factory data
  • All measurements need to be done with an instrument! Your hand is not a thermometer, and simply saying “it feels cold” is not correct data!

 

Source: The NEWS “Contractor Tips for Long Compressor Life”