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Walgreens 5604-R14 June 24,2014 <br /> the additional demand. <br /> Alternate Economizer Operation: <br /> Under the Default Operation, as described above, the su ply fan speed will remain at minimum speed, as determined <br /> by the active <br /> cooling stages, until the space demand requires an increase in supply airflow The customer will have the ability to <br /> choose to allow <br /> the supply fan speed to increase when the economizer i enthalpy enabled in order to realize the maximum cooling <br /> capacity of the <br /> economizer, prior to energizing compressor outputs, wh n the space requires active cooling capacity. All cooling <br /> capacity demand <br /> decisions will function as described in the �Default Oper tion� section above with the exception of the supply fan <br /> speed when the <br /> unit has an active cooling demand and the economizer i�enthalpy enabled. <br /> Heatinq Operation <br /> During Heating operation, the control will monitor the Space Temperature and Space Heating setpoint and with a PI <br /> control algorithm determine if active heating capacity is re� uired. As the Space Temperature deviates from the Space <br /> Heating Setpoint, the unit controller will increase the supp�y airtlow up to the user selected, application specific, <br /> maximum airflow and begin to stage heating outputs (gas or electric)to meet the space demand. <br /> The customer will also have the ability to enable Supply A r Tempering control which will allow the unit to bring on one <br /> stage of heating when the discharge air temperature falls elow the Space Heating Setpoint- 10°F and the unit is <br /> operating in a minimum ventilation state with the supply fan running (not actively heating or cooling). The supply fan <br /> output will increase to the user selected, application speci ic, maximum airflow during Supply Air Tempering operation. <br /> FLD=Furnished by Trane U.S.Inc./Installed by Equipm nt Su4mitta! Page 9 of 30 <br /> Others <br />