York Predator Z series Installation Instructions Manual

Contents

5370596-YIM-C-0518Johnson Controls Ducted Systems 31At no time will a compressor output be turned ON if theeconomizer output is less than 100%, even if the differentialbetween zone (or return) temperature and the current coolingsetpoint is great enough to demand more than one stage ofcooling.If the economizer output goes to minimum position and the SATis less than Economizer Setpoint -1°F, the control starts a 12-minute timer to de-energize a compressor output.If at any time the economizer output goes above the minimumposition the timer stops and resets when the economizer outputreturns to minimum position.If the demand for cooling from the space/return is satisfied, theeconomizer output will modulate to minimum position and thecompressor outputs will be de-energized as long as theirminimum run timers have expired.Power ExhaustSetpointsa. Economizer Enable ONb. Power Exhaust Enable ONc. Modulating Power Exhaust OFFd. Exhaust VFD Installed OFFe. Building Pressure Sensor Enabled OFFf. Econo Damper Position For Exh Fan ON Percentg. Econo Damper Position For Exh Fan OFF PercentInputsNo inputs are present for non-modulating power exhaust.Outputsa. 2-10 VDC from ECON on Economizer Expansion moduleb. 24 VAC from EX-FAN to energize exhaust fan onEconomizer Expansion moduleOperationOperation details include:a. Compares economizer output to the Economizer DamperPosition For Exhaust Fan On and OFF.b. Energizes exhaust fan when economizer output is aboveEconomizer Damper Position For Exhaust Fan On.c. De-energizes exhaust fan when economizer output isbelow the Economizer Damper Position for Exhaust FanOFF