Geostar ASTON Series Installation Manual
Also see for ASTON SERIES: Installation manualManualInstallation manualInstallation manualInstallation manual
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Contents
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21Reference CalculationsHeating Calculations: Cooling Calculations:LWT = EWT +LAT (DB) = EAT (DB) -LC = TC - SCS/T =HRGPM x 500SCCFM x 1.08SCTCLWT = EWT -LAT = EAT +TH = HC + HWHEGPM x 500HCCFM x 1.08LegendABBREVIATIONS AND DEFINITIONS:CFM = airflow, cubic feet/minuteEWT = entering water temperature, FahrenheitGPM = water flow in gallons/minuteWPD = water pressure drop, PSI and feet of waterEAT = entering air temperature, Fahrenheit(dry bulb/wet bulb)HC = air heating capacity, MBTUHTC = total cooling capacity, MBTUHSC = sensible cooling capacity, MBTUHKW = total power unit input, kilowattsHR = total heat of rejection, MBTUHHE = total heat of extraction, MBTUHHW = hot water generator capacity, MBTUHEER = Energy Efficiency Ratio= BTU output/Watt inputCOP = Coefficient of Performance= BTU output/BTU inputLWT = leaving water temperature, °FLAT = leaving air temperature, °FTH = total heating capacity, MBTUHLC = latent cooling capacity, MBTUHS/T = sensible to total cooling ratioOperating Limits Cooling HeatingAir LimitsMinimum ambient air, DB -10°F [-23.3°C] -10°F [-23.3°C]Rated ambient air, DB 80.0 [26.7°C] 70°F [21.1°C]Maximum ambient air, DB 120 [48.8°C] 85°F [29°C]Water LimitsMinimum entering water 30°F [-1°C] 20°F [-6.7°C]Normal entering water 50-110°F [10-43°C] 30-70°F [-1 to 21°C]Maximum entering water 120°F [49°C] 90°F [32°C]Normal water flow 1.5 to 3.0 gpm per ton[1.6 to 3.2 l/m per kW]Operating LimitsNOTES: Minimum/maximum limits are only for start-up conditions, and are meantfor bringing the space up to occupancy temperature. Units are not designed tooperate at the minimum/maximum conditions on a regular basis. The operatinglimits are dependent upon three primary factors: 1) water temperature, 2) returnair temperature, and 3) ambient temperature. When any of the factors are at theminimum or maximum levels, the other two factors must be at the normal level forproper and reliable unit operation.ASTON DUAL-CAPACITY OUTDOOR SPLIT SERIES INSTALLATION MANUAL |
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