York SUNLINE 2000 B2CH180 Installation Instructions Manual

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York SUNLINE 2000 B2CH180 Installation Instructions Manual Manual pdf 13 page image

HEAT ANTICIPATOR SETPOINTIt is important that the anticipator setpoint be correct. Too high asetting results in longer heat cycles and a greater temperatureswing in the conditioned space. Reducing the value below thecorrect setpoint causes shorter “ON” cycles and may result inthe lowering of the temperature within the conditioned space.Refer to Table 9 for the required heat anticipator setting.CHECKING SUPPLY AIRFLOWThe RPM of the supply air blower will depend on the requiredairflow, the unit accessories and the static resistances of boththe supply and the return air duct systems. With thisinformation, the RPM for the supply air blower and the motorpulley adjustment (turns open) can be determined from theblower performance data in Table 4.Knowing the required blower RPM and the blower motor HP,the setting (turns open) for the supply air motor pulley can bedetermined from Table 10.BELT DRIVE BLOWERAll units have belt drive single-speed blower motors. Thevariable pitch pulley on the blower motor can be adjusted toobtain the desired supply air flow.Note the following:1. The supply airflow must be within the limitations shown inTable 1.2. Pulleys can be adjusted in half turn increments.3. The tension on the belt should be adjusted as shown inFigure 8.Start the supply air blower motor. Adjust the resistances in boththe supply and the return air duct systems to balance the airdistribution throughout the conditioned space. The jobspecifications may require that this balancing be done bysomeone other than the equipment installer.To check the supply airflow after the initial balancing has beencompleted:1. Remove the two dot plugs from the blower motor and the fil-ter access panels shown in Figure 7.2. Insert at least 200mm (8") of tubing (approximately 6mm(1/4") diameter) into each of these holes for sufficient pene-tration into the air flow on both sides of the indoor coil.NOTE: The tubes must be inserted and held in a positionperpendicular to the air flow so that velocity pres-sure will not affect the static pressure readings.3. Using an inclined manometer, determine the pressure dropacross a dry indoor coil. Since the moisture on an indoorcoil may vary greatly, measuring the pressure drop acrossa wet coil under field conditions would be inaccurate. To en-sure a dry coil, the compressors should be de-energizedwhile the test is being run.4. Knowing the pressure drop across a dry coil, the actual airflow through the unit and clean filters, can be determinedfrom the curve in Figure 9.WARNING: Failure to properly adjust the total system air quan-tity can result in extensive blower damage.After readings have been obtained, remove the tubes andreinstall the two dot plugs that were removed in Step 1.NOTE: DE-ENERGIZE THE COMPRESSORS BEFORETAKING ANY TEST MEASUREMENTS TO ENSUREA DRY INDOOR COIL.035-18895-000-A-0902Unitary Products Group 13HEATERkWSETTING, AMPSTH1 TH218 0.29 -36 0.29 0.2954 0.29 0.2972 0.29 0.29TABLE 9 - HEAT ANTICIPATOR SETTINGTURNSOPEN*BLOWER DRIVE RANGE (RPM)180 UNIT6 8455 8854 9253 9602 10001 1040*Pulleys can be adjusted in half-turn increments.Do NOT close pulley below 1 turn open.TABLE 10 - SUPPLY AIR BLOWER MOTOR PULLEYADJUSTMENTNOMINAL CFM (THOUSANDS) SUPPLY AIR4 5 6 7 8 9 100.650.550.450.350.25180 MBHPRESSURE DROP (iwg)1.611.361.128162PRESSURE DROP (Pa)m3/s SUPPLY AIR1.9 2.4 2.8 3.3 3.8 4.2 4.7FIG. 9 - PRESSURE DROP ACROSS A DRY INDOORCOIL VS SUPPLY AIRFLOWFIG. 8 - BELT ADJUSTMENT

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