AC/HP ������������������������������������������ ���������� REFERENCE CHARTS PRESSURE -TEMPERATURE CHART QUICK SYSTEM ANALYSIS (��) OPERATING TRENDS (LOW-NORMAL-HIGH SYSTEM SUCTION DISCHARGE PROBLEM PRESSURE PRESSURE SUPERHEAT SUBCOOLING AMPERES L N H L N H L N H L N H L N H Overcharge �� �� �� �� �� Condenser (Air) Restricted �� �� �� �� �� Non-Condensibles in System �� �� �� �� �� High Evaporator Load �� �� �� �� �� Loose TXV Feeder Bulb - Oversized TXV - Leaking TXV Seat �� �� �� �� �� - Wrong Equalizer Connection - Uninsulated Feeder Bulb Undercharge �� �� �� �� �� Liquid Line Restriction �� �� �� �� �� Low Outdoor Ambient �� �� �� �� �� Suction Line Restriction �� �� �� �� �� Evaporator Air (Cooler Liquid) Restricted �� �� �� �� �� Undersized TXV - Leaking Feeder Bulb �� �� �� �� �� - No External Equalizer Inefficient Compressor �� �� �� �� �� ACTUAL SYSTEM OPERATION (��) INDOOR DRY BULB ADJUSTMENT Use equations below in conjunction with unit's "Tech Label" information for total and sensible capacities @ indoor dry bulbs other than 80°F entering coil. = Sensible Capacity at = Indoor db HIGHER 1000 ( ) (MBh x S/T) – (80-Indoor db) x 835 x Indoor cfm 1000 ( ) (MBh x S/T) + (Indoor db-80) x 835 x Indoor cfm SYSTEM CAPACITY CALCULATOR Sensible Capacity at Indoor db LOWER than 80°F than 80°F Temperature Enthalpy Temperature Enthalpy Temperature Enthalpy Temperature Enthalpy Temperature Enthalpy Temperature Enthalpy Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB Wet-Bulb (F) Btu/LB 40 15.23 48 19.21 56 23.84 64 29.31 72 35.83 80 43.69 41 15.7 49 19.75 57 24.48 65 30.06 73 36.74 81 44.78 42 16.17 50 20.3 58 25.12 66 30.83 74 37.66 82 45.9 43 16.66 51 20.86 59 25.78 67 31.62 75 38.61 83 47.04 44 17.15 52 21.44 60 26.46 68 32.42 76 39.57 84 48.22 45 17.65 53 22.02 61 27.15 69 33.25 77 40.57 85 49.43 46 18.16 54 22.62 62 27.85 70 34.09 78 41.58 47 18.68 55 23.22 63 28.57 71 34.95 79 42.62 INDOOR COIL (EVAPORATOR) OUTDOOR COIL (CONDENSOR) ENTERING LEAVING ENTERING DIFFERENCE ��h = Btu/LB W.B. (Air) D.B. Enthalpy CONDENSOR CAPACITY EVAPORATOR CAPACITY BTUH = 1.10 x COND. Cfm x ��T BTUH = 4.5 x cfm x ��h LEAVING DIFFERENCE ��T = °F Due to varying field condidtions, a tolerance of 10% must be expected when comparing test data to actual performance. * Used in the "Total External Static" method in conjunction with the "Blower Performance Data" in Product Specification sheets or the unit's "Tech Label" to calculate airflow. † Temperature rise is equal to the supply air temp. minus the return air temp. at steady state operation. The supply air temp. should be measured away form the line of sight of the heat exchanger. ������������������������������International Comfort Products ������������������ 4010680000�� �������������������������������������������������������������������������������������������������������� 114 ������������������������������������������������������������������������������ www.uri.com www.goarcoaire.com
19913ATh
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