3000 ROCKEFELLER AVE ADMIN BLDG WEST 2024-10-25

R I GTON Abbreviations AIR QUALITY SERVICES AC or ACU Air Conditioning Unit EAT Entering Air Temperature AP Pressure Drop. AHU Air Handling Unit EF Exhaust Fan PH Phase Ak The area of an opening in sq./ft. EG/ED Exhaust Grille/Diffuser PSI Pounds per Square Inch ATM Atmosphere EMS Energy Management System RA Return Air AVG Average ERU Energy Recovery Unit RAT Return Air Temperature BHP Brake Horsepower FHT Fume Hood Test RF Return Fan CAV Constant Air Volume FPB Fan Powered Box RH Relative Humidity CBV Cal. Balance Valve FPM Feet per Minute RHC Reheat Coil CC Cooling Coil FT Foot, Feet RPM Revolutions per Minute CD Ceiling Diffuser GPM Gallons per Minute RTU Roof Top Unit CFM Cubic Feet per Minute HC Heating Coil SA Supply Air CH Chiller TDH Total Dynamic Head-Pump SAT Supply Air Temperature CHWS Chilled Water Supply HEPA High Efficiency Particulate Arrentance S.F.Service Factor CHWR Chilled Water Return HP Horsepower SF Smoke/Fire Damper CP Circulating Pump HVAC Heating Ventilation and AC SWG Sidewall Grille CD/CR Ceiling Diffuser/Register HWS Heating Water Supply TAB Test,Adjust&Balance CRAC Computer Room AC HWR Heating Water Return TEMP Temperature CRU Computer Room Unit HX Heat Exchanger TON 12,000 BTUH(Cooling CT Cooling Tower HZ Hertz,cycle/second of current TSTAT Thermostat(T) CU Condenser Unit in.w.g.inches of water gauge TSP Total Static Pressure CUH Cabinet Unit Heater K-factor Correction factor to the free area UH Unit Heater needed to calculate CFM CWS Condenser Water Supply KW Kilowatts V Volt—Either AC or DC CWR Condenser Water Return LAT Leaving Air Temperature VAV Variable Air Volume box D Discharge LWT Leaving Water Temperature VD Volume Damper DAT Discharge Air Temperature MAU Make-up Air Handling Unit VEL Velocity(usually in FPM) DB Dry Bulb MBH 1,000 BTUH VFD Variable Frequency Drive DDC Direct Digital Controls NT Not Tested VVT Variable Volume Terminal DP Differential Pressure OSA Outside Air W.G.Water Gauge DNA Data not available or given OBD Opposed Blade Damper WB Wet Bulb DNV Data Not Visible OD Outside Diameter 1) TAB—Test the quantitative performance of a system then regulate it to a specific rate and to the proportion the flow according to the design 2) Flowhood—Instrument used by a Balancer to capture air and measures and reports in CFM 3) Total Static Pressure-Difference in pressure from the inlet to the discharge of a fan added together 4) Economizer—Components and controls that allow an air handler to effectively use outside air instead of mechanical cooling to save energy and provide building pressurization 5) Total Dynamic Head-The difference between the pressure of a fluid entering a pump vs exiting added together 6) Design Tolerance—Specified by the designer or+/-10% 7) Ratio of Tolerance-Used to verify that terminals and/or the system are within Design Tolerance;Example 90%- 110%of design if design was 250 then.90/1.10=1.22 and flow between 275CFM-225CFM would be acceptable