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Job Name:WAA • <br /> Prepared By:E n State Sheet Metal <br /> Unit Tag:Y4V-1 <br /> Quantity:1 <br /> 1. OCCUPIED HEAT/COOL: <br /> The RTU shall operate the supply fan continuously and modulate (or cycle) compressors, modulate (or <br /> stage) heat, and/or enable airside economizing to maintain zone temperature at setpoint. The OA <br /> damper shall open to bring in the required amount of ventilation. <br /> 2. MORNING WARM-UP/PRE-COOL: <br /> The RTU shall operate the supply fan and modulate (or cycle) compressors or modulate (or stage) <br /> heat to raise/lower zone temperature to its occupied setpoint. The OA damper shall remain closed, <br /> unless economizing. <br /> D. CHANGEOVER BYPASS SYSTEM <br /> 1. OCCUPIED HEAT/COOL: <br /> Each VAV terminal shall use pressure-independent control, with airflow measurement, to vary primary <br /> airflow to maintain zone temperature at its occupied setpoint. The RTU shall modulate the bypass <br /> damper to maintain duct static pressure at setpoint and modulate (or cycle) compressors, modulate (or <br /> stage) heat, and/or enable airside economizing based on current zone cooling/heating demands. The <br /> OA damper shall open to bring in the required amount of ventilation. <br /> 2. MORNING WARM-UP/PRE-COOL: <br /> Each VAV terminal unit shall vary primary airflow to raise/lower zone temperature to its occupied <br /> setpoint. The RTU shall modulate the bypass damper to maintain duct static pressure at setpoint and <br /> modulate (or cycle) compressors or modulate (or stage) heat based on current zone cooling/heating <br /> demands. The OA damper shall remain closed, unless economizing. <br /> 3. COOLING/HEATING CHANGEOVER LOGIC: <br /> The System Controller shall determine the overall system cooling/heating mode based on "voting" <br /> from each zone. When the majority of zones require cooling, the RTU shall operate in cooling mode <br /> and any zone that requires heating shall reduce primary airflow to minimum. When the majority of <br /> zones require heating, the RTU shall operate in heating mode and any zone that requires cooling shall <br /> reduce primary airflow to minimum. <br /> 2020-02-10 17 OR•977 <br />