SPP ���������������������������������������� SYSTEM SUCTION DISCHARGE PROBLEM PRESSURE PRESSURE SUPERHEAT SUBCOOLING AMPERES 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 (��) 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) DIFFERENCE ��h = Btu/LB OUTDOOR COIL (CONDENSOR) ENTERING LEAVING ENTERING 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 Due to varying field condidtions, a tolerance of 10% must be expected when comparing test data to actual performance. AIRFLOW OPERATING TRENDS (LOW-NORMAL-HIGH L N H L N H L N H L N H L N H SYSTEM CAPACITY CALCULATOR Electric Heat Temp Rise Method cfm = �������� (Volts)(Amps)(3.413) 1.08(��T) Furnace btu output 1.08(��T) cfm = QUICK SYSTEM ANALYSIS (��) LEAVING DIFFERENCE ��T = °F SYSTEM CAPACITY Htg. System Capacity btu output =(cfm)(1.08)(��T) FIRING RATE OUTPUT REFERENCE CHARTS 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. PRESSURE - TEMPERATURE CHART Sensible Capacity at Indoor db LOWER than 80°F = Sensible Capacity at Indoor db HIGHER then 80°F= **Firing Rate = Heat Content(Btu/cu.ft) X 3600(sec/hr) seconds per revolution (assume 1 cu.ft dial) ( (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 1000 ( ) * 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. *** Supply pressure chould be checked with all other gas appliances running. † 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 ������������������ 4010681000�� �������������������������������������������������������������������������������������������������������� 122 ������������������������������������������������������������������������������ www.uri.com www.goarcoaire.com
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