York HA300 Technical Manual

Contents

036-21345-001-B-01056 Unitary Products Group*These power requirements include the following condenser fan motor KW.LINE SIZINGWhen sizing refrigerant pipe for a split-system air conditioner,check the following:1. Suction line pressure drop due to friction.2. Liquid line pressure drop due to friction.3. Suction line velocity for oil return.4. Liquid line pressure drop due to vertical rise.Tables 6 and 7 list friction losses for both the suction and liq-uid lines on the condensing section. For certain pipingarrangements, different sizes of suction line pipe may have tobe used. The velocity of the refrigerant vapor must always begreat enough to carry the oil back to the compressor.Evaporator Below Condensing Section - On a split systemwhere the evaporator blower is located below the condensingsection, the suction line must be sized for both pressure dropand for oil return. Oil traps may be required on this type ofapplication. See Table 6.Condensing Section Below Evaporator - When the con-densing section is located below the evaporator blower, theliquid line must be designed for the pressure drop due to bothfriction loss and vertical rise. See Table 7. If the pressuredrop due to vertical rise and friction exceeds 40 psi, somerefrigerant will flash before it reaches the thermal expansionvalve.Flash Gas:1. Increases the liquid line pressure loss due to frictionwhich in turn causes further flashing.2. Reduces the capacity of the refrigerant control devicewhich starves the evaporator.3. Erodes the seat of the refrigerant control device.4. Causes erratic control of the refrigerant entering theevaporator. (See Installation Instructions for more detail.)TABLE 5: UNIT COOLING CAPACITIES AND POWER REQUIREMENTS - CONDENSING UNIT ONLYModelSuction Press. & CorrespondingTemp. @ SaturationTemperature of Air on Condenser Coil, °F65 75 85 95 105 115PSIG °F MBH KW* MBH KW* MBH KW* MBH KW* MBH KW* MBH KW*HA30061.568.576.084.03540455025828230832222.022.422.823.224727029431923.624.024.324.723625828030425.525.826.226.522524526628927.628.028.328.721323225327430.130.530.931.220222023925933.033.433.734.1HB36061.568.576.084.03540455031634337140026.326.827.428.130132735438228.228.829.530.138531033736430.531.231.832.526929431934633.233.834.535.225327730232836.036.637.237.823726028430939.439.940.641.2HB48061.568.576.084.03540455042345849453133.634.435.336.240443847350936.237.037.938.838441745148639.240.040.841.836439642946242.643.444.345.234437540643946.547.348.149.032435438441550.951.752.553.4HB60061.568.576.084.03540455051456161066139.640.441.342.249253758463242.943.644.545.347051255660346.747.448.249.044748752957351.051.852.653.442546250254456.156.957.758.540243747451461.862.663.564.4Model HA300 HB360 HB480 HB600KW 3.4 4.3 4.3 3.8