CAUSES AND EFFECTS OF DEFERRED MAINTENCE Texas Association of Community Schools Houston, Texas October 20, 2014 Greg Spencer © American Standard Inc. Statistics today: USGAO estimates 1 in 5 children attend schools with poor IAQ Old infrastructure – 73% of public schools built prior to 1970 GAO report indicates 15,000 schools circulating unfit air Nationally, deferred maintenance costs risen to $127B © American Standard Inc. Contributors to the problem: Inadequate school funding Increased enrollments Lack of manpower and capabilities Competing interests – curricular & facility © American Standard Inc. Some impacts: Inefficient equipment operation Reduced equipment effectiveness Increased utility costs Poor IAQ Reduced equipment life expectancy © American Standard Inc. Tough Life for a RTU-Typical in TX Regarded as semi-disposal pieces of equipment. Live in a harsh environment. Receive little to no maintenance. © American Standard Inc. Air-Side Vs. Refrigerant-Side Two fluid loops to deal with. Air Side Refrigerant Side Always do air-side maintenance and repairs first. © American Standard Inc. Air-Side Focus Filters Cooling Coil Fan Motor Casing Integrity © American Standard Inc. Filters – what are they for? Maintain air cleanliness in classrooms Keeps the unit clean Best investment in the system © American Standard Inc. How often to change? Quarterly or sooner Tie to Energy Management System Install pressure differential switch © American Standard Inc. Cooling Coil Dirt on cooling coil costs both temperature and utility costs Texas Field Test 87% of units need coil cleaning Clean evaporator coil yearly © American Standard Inc. RTU Blower Bearing lubrication Clean fan blades Measure air flow © American Standard Inc. Motors Sealed bearings Specify energy efficient motors When buying new equipment When buying replacement parts © American Standard Inc. Casing Integrity Many access panels can leak Too many screws Old gaskets and seals Leaks in cabinet costs more than $ 100/year © American Standard Inc. Condenser Coil Exposed to the outdoor elements A dirty coil raising the condenser temperature by 10 degrees can cost over $250 / year in energy. Best money you can spend on maintenance Clean coils yearly. © American Standard Inc. CHW systems similar Poor pumping losses can exceed 10% Cooling tower- 1 degree rise = 1.5% higher costs Tube fouling-can equate to 10% loss in efficiency Refrigerant charge-17% loss in efficiency Boilers-buildup can create 10% loss in efficiency © American Standard Inc. Thank You © American Standard Inc.