York DNZ 024 Installation Manual

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York DNZ 024 Installation Manual Manual pdf 6 page image

66433-YIM-B-10046 Unitary Products GroupDUCT WORKThese units are adaptable to downflow use as well as rearsupply and return air duct openings. To convert to downflow,use the following steps:1. Remove the duct covers found in the bottom return andsupply air duct openings. There are four (4) screwssecuring each duct cover (save these screws to use inStep 2).2. Install the duct covers (removed in step one) to the rearsupply and return air duct openings. Secure with the four(4) screws used in step one.3. Seal duct covers with silicone caulk.Duct work should be designed and sized according to themethods of the Air Conditioning Contractors of America(ACCA), as set forth in their Manual D.A closed return duct system shall be used. This shall not pre-clude use of economizers or ventilation air intake. Flexiblejoints may be used in the supply and return duct work to min-imize the transmission of noise.NOTE: Be sure to note supply and return openings.Refer to Figures 7 and 8 for information concerning rear andbottom supply and return air duct openings.ROOF CURBOn applications when a roof curb is used, the unit must bepositioned on the curb so the front of the unit is tight againstthe curb.FILTERSSingle phase units are shipped without a filter or filter racks. Itis the responsibility of the installer to secure a filter in thereturn air ductwork or install a Filter/Frame Kit (1FF0110).A filter rack and high velocity filters are standard on threephase units.Filters must always be used and must be kept clean. Whenfilters become dirt laden, insufficient air will be delivered bythe blower, decreasing your units efficiency and increasingoperating costs and wear-and-tear on the unit and controls.Filters should be checked monthly; this is especially impor-tant since this unit is used for both heating and cooling.CONDENSATE DRAINA condensate trap is recommended to be installed in the con-densate drain. The plumbing must conform to local codes.Use a sealing compound on male pipe threads. Install thecondensate drain line (NPTF) to spill into an open drain.SERVICE ACCESSAccess to all serviceable components is provided at the fol-lowing locations:• Blower compartment access panel• Gas control/electrical access panel• Refrigerant connectionsRefer to Figure 6 for location of these access locations andminimum clearances in Table 10.Refer to Figure 16 for the R-410A Quick Reference Guide.THERMOSTATThe room thermostat should be located on an inside wallapproximately 56" above the floor where it will not be subjectto drafts, sun exposure or heat from electrical fixtures orappliances. Follow manufacturer's instructions enclosed withthe thermostat for general installation procedure. Four colorWhen fastening duct work to the side duct flangeson the unit, insert the screws through the ductflanges only. Do not insert the screws through thecasing. Outdoor ductwork must be insulated andwaterproofed.This system uses R-140A Refrigerant which oper-ates at higher pressures than R-22. No otherrefrigerant may be used in this system. Gage sets,hoses, refrigerant containers and recovery sys-tems must be designed to handle R-410A. If youare unsure, consult the equipment manufacturer.Failure to use R-410A compatible servicing equip-ment may result in property damage or injury.Wear safety glasses and gloves when handlingrefrigerants. Failure to follow this warning cancause serious personal injury.