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<br />PH Pre-Heat <br />PID Proportional Integral Derivative <br />PRV Pressure Relief Valve <br />PRV Pressure Reducing Valve <br />PTAC Packaged Terminal Air Conditioner <br />RA Return Air <br />RF Return Fan <br />RH Reheat <br />RH Relative Humidity <br />RPM Revolutions Per Minute <br />RTD Resistance Temperature Detector <br />RTU Roof Top Unit <br />SA Supply Air <br />SAT Supply Air Temperature <br />SC Shading Coefficient <br />SEER Seasonal Energy Efficiency Ratio <br />SF Supply Fan <br />SHFG Solar Heat Gain Factor <br />SHR Sensible Heat Ratio <br />SP Set Point <br />SP Static Pressure <br />SWP Steam Working Pressure <br />T Temperature <br />T Thermostat <br />TEV Thermostatic Expansion Valve <br />TOD Time Of Day <br />TORR Millimeter of Mercury (mmHg) <br />TXV Thermostatic Expansion Valve <br />UH Unit Heater <br />UV UltraViolet <br />UV Unit Ventilator <br />VAV Variable Air Volume <br />VD Volume Damper <br />VFD Variable Frequency Drive <br />VSD Variable Speed Drive <br />VSP Variable Speed Pump(ing) <br />WB Wet Bulb <br />WC Water Column <br />YTD Year to Date <br /> ASHRAE LEVEL 1 ENERGY AUDIT ADMINISTRATION IX <br /> <br />