York DF 072 Technical Manual

Contents

York DF 072 Technical Manual Manual pdf 7 page image

254599-YTG-C-0807Unitary Products Group 7FIELD-INSTALLED ACCESSORIES• SINGLE INPUT ELECTRONIC ENTHALPY ECONO-MIZERS - Includes a slide-in / plug-in damper assemblywith fully modulating spring-return motor actuator capa-ble of introducing up to 100% outdoor air with nominal1% leakage type dampers.The enthalpy system contains one sensor that monitorsthe outdoor air and determines when the air is coolenough and dry enough to provide free cooling.The rainhood is painted to match the basic unit and mustbe field-assembled before installing.• MOTORIZED OUTDOOR AIR INTAKE DAMPER -Includes a slide-in / plug-in damper assembly with a 2-position, spring return motor actuator which opens tosome pre-set position whenever the supply air blower isoperating and will drive fully closed when the blower unitshuts down.The rain hood is painted to match the basic unit andmust be field assembled before installing.• ELECTRIC HEATERS wired for single point power sup-ply. These nickel chromium heater elements are pro-vided with limit and automatic reset capability to preventoperation at excessive temperatures.• ROOF CURBS - Eight and fourteen-inch high roof curbsprovide a water-tight seal between the unit and the fin-ished roof. These full perimeter curbs meet the require-ments of the National Roofing Contractors Association(NRCA) and are shipped knocked-down for field assem-bly.Roof curbs are designed to fit inside the base rails of theunit and include both a wood nailing strip and ducthanger supports.• HIGH ALTITUDE NATURAL GAS - Burner orifices andpilot orifices are provided for proper furnace operation ataltitudes up to 6,000 feet.• PROPANE - Burner orifices, pilot orifices and gas valveparts are provided to convert a natural gas furnace topropane.• HIGH ALTITUDE PROPANE - Burner orifices and pilotorifices are provided for proper furnace operation at alti-tudes up to 6,000 feet. This accessory supplements thebasic propane conversion kit.• LOW NOX KIT- Required to reduce the emission ofnitrogen oxides below 40 nanograms per joule.• POWER EXHAUST - Our single input economizeroptions are available with power exhaust. Whenever theoutdoor air intake dampers are opened for free cooling,the exhaust fan will be energized to prevent the condi-tioned space from being over-pressurized during econo-mizer operation.The power exhaust option can only be used on bot-tom duct configurations.• BAROMETRIC RELIEF DAMPER - This damper acces-sory can be used to relieve internal building air pressureon units with an economizer without power exhaust. Thisaccessory includes a rain hood, a bird screen and a fullyassembled damper. With bottom duct connections, thedamper should be mounted over the opening in thereturn air panel. With horizontal ductwork, the accessoryshould be mounted on the return air duct.• ENTHALPY ACCESSORY CONTROL KIT - This kitcontains the required components to convert a singleenthalpy economizer to dual enthalpy.• BURGLAR BARS - Mount in the supply and returnopenings to prevent entry into the duct work.• FLUE EXHAUST EXTENSION KIT - In locations withwind or weather conditions which may interfere withproper exhausting of furnace combustion products, thiskit can be installed to prevent the flue exhaust fromentering nearby fresh air intakes.• CO 2 SENSOR - Senses CO 2 levels and automaticallyoverrides the economizer when levels rise above thepresent limits.• COIL GUARD - Customers can purchase a coil guard kitto protect the condenser coil from damage. This is not ahail guard kit.• HAIL GUARD - Hail guard kit is available to prevent unitfrom hail damage. This is a sloped hood that fits abovethe coil.• GAS PIPING KIT - This kit supplies all necessary fittingsand shut off valve.