York Predator DF 078 Technical Manual

Also see for PREDATOR 102: Technical guide

Contents

246699-YTG-D-1208Johnson Controls Unitary Products 45outdoor and return air damper assembly to prevent thesupply air temperature from dropping below 55 ºF.Changeover from compressor to economizer operationshall be provided by an integral electronic enthalpy con-trol that feeds input into the basic module. The outdoorintake opening shall be covered with a rain hood thatmatches the exterior of the unit. Water eliminator/filtersshall be provided. Simultaneous economizer/compressoroperation is also possible. Dampers shall fully close onpower loss. Available with barometric relief or powerexhaust.2. MOTORIZED OUTDOOR AIR DAMPERS - Outdoor andreturn air dampers that are interlocked and positioned bya 2-position, spring-return damper actuator. The maxi-mum leakage rate for the outdoor air intake dampersshall not exceed 2% when dampers are fully closed andoperating against a pressure differential of 0.5 IWG. Aunit-mounted potentiometer shall be provided to adjustthe outdoor and return air damper assembly to take inthe design CFM of outdoor air to meet the ventilationrequirements of the conditioned space during normaloperation. Whenever the indoor fan motor is energized,the dampers open up to one of two pre-selected posi-tions - regardless of the outdoor air enthalpy. Dampersreturn to the fully closed position when the indoor fanmotor is de-energized. Dampers shall fully close onpower loss.ADDITIONAL FACTORY INSTALLED OPTIONS• ALTERNATE INDOOR BLOWER MOTOR - For applica-tions with high restrictions, units are available withoptional indoor blower motors that provide higher staticoutput and/or higher airflow.• CONVENIENCE OUTLET (POWERED/NON-POW-ERED - Unit can be provided with an optional 120VACGFCI outlet with cover on the corner of the unit housingthe compressors.• ELECTRIC HEAT - Electric heaters range from 9kW to54 kW and are available in all the voltage options of thebase unit.• PHASE MONITOR - Designed to prevent damage in out-of-phase condition.• COIL GUARD - Designed to prevent condenser coildamage.• BAS CONTROLS - Include supply air sensor, return airsensor, dirty filter indicator and air proving switch.• DIRTY FILTER SWITCH - This kit includes a differentialpressure switch that energizes the fault light on the unitthermostat, indicating that there is an abnormally high-pressure drop across the filters.• BREAKER - An HACR breaker can be factory installedon gas heat units or cooling units with electric heaters.• DISCONNECT SWITCH - A disconnect can be factoryinstalled on cooling only units, sized for the largest elec-tric heat available.• STAINLESS STEEL HEAT EXCHANGER - For applica-tions in a corrosive environment, this option provides afull stainless steel heat exchanger assembly.• STAINLESS STEEL DRAIN PAN - Provides years oftrouble free operation in corrosive environments.• SMOKE DETECTOR - A smoke detector can be factorymounted and wired in the supply and/or return air com-partments.OTHER PRE-ENGINEERED ACCESSORIES AVAILABLE• ROOF CURB - 14” and 8” high, full perimeter knockdowncurb, with hinged design for quick assembly.• BAROMETRIC RELIEF DAMPER - (Unit Mounted -Downflow, Duct Mounted - Horizontal flow) - Contains arain hood, air inlet screen, exhaust damper and mount-ing hardware. Used to relieve internal air pressurethrough the unit during economizer operation.• PROPANE CONVERSION KIT - Contains new orificesand gas valve springs to convert from natural to L.P. gas.• -60 ºF GAS HEAT KIT - Provides an electric heat kit forthe gas compartment for use in extreme low ambientconditions.• ECONOMIZER (Downflow and Horizontal flow)• POWER EXHAUST - (Unit mount - Downflow, Ductmount - Horizontal flow)• DUAL ENTHALPY KIT - Provides a second input toeconomizer to monitor return air.

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