York DHG180 Installation Instruction

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York DHG180 Installation Instruction Manual pdf 6 page image

035-17233-000-C-07026 Unitary Productscombustion and ventilation air in accordance with Section5.3, Air for Combustion and Ventilation of the National FuelGas Code, ANSI Z223.1 (in U.S.A.) or Sections 7.2, 7.3 or7.4 of Gas Installation Codes CAN/CGA-B149.1 and .2 (inCanada) and/or applicable provisions of the local buildingcodes. Refer to Table 8 for the clearances required forcombustible construction, servicing, and proper unitoperation.DUCTWORKDuctwork should be designed and sized according to themethods in Manual Q of the Air Conditioning Contractors ofAmerica (ACCA).A closed return duct system shall be used. This shall not pre-clude use of economizers or outdoor fresh air intake. Thesupply and return air duct connections at the unit should bemade with flexible joints to minimize noise.The supply and return air duct systems should be designedfor the CFM and static requirements of the job. They shouldNOT be sized to match the dimensions of the duct connec-tions on the unit.Refer to Figure 10 and 12 for information concerning side andbottom supply and return air duct openings.FIXED OUTDOOR AIR INTAKE DAMPERThis damper is shipped inside the return air compartment. Itis completely assembled and ready for installation. A damperbaffle inside of the hood is adjustable to provide variableamounts of outdoor air intake on units that are not providedwith an economizer or a motorized damper option. Refer toFigure 3.Gasketing and mounting screws are provided in a parts bagattached to the hood assembly. Apply gasketing to the threeflange surfaces on the hood prior to installing the hood.Extend gasketing 1/4" beyond the top and bottom of the twoside flanges to insure adequate sealing.Adjusting the damper to the desired air flow may be donebefore mounting the hood into position or (after installation)by removing the front hood panel or the screen on the bottomof the hood. Damper baffle in position 1 will allow approxi-mately 10% recirculated air flow, position 2 approximately15% and, to allow approximately 25%, remove the damperbaffle.On units with bottom return air applications, install thedamper assembly over the opening in the side return airaccess panel. Remove and discard the opening cover andthe covering over the hood mounting holes (used for ship-ping) before installing. Secure with the screws provided.On units with side return air applications, install the damperassembly on the return air ductwork as close to the unit aspossible. Cut an opening 16" high by 18" wide in the ductworkto accommodate the damper. Using the holes in the hoodflanges as a template, drill 9/64" dia. (#26 drill) holes into theductwork and secure with the screws provided.Do not permit overhanging structures or shrubs toobstruct outdoor air discharge outlet, combustionair inlet or vent outlets.When fastening ductwork to side duct flanges onunit, insert screws through duct flanges only. DONOT insert screws through casing.Outdoor ductwork must be insulated and water-proofed.FIGURE 3 : FIXED OUTDOOR AIR DAMPERIf outdoor air intake will not be required on unitswith bottom return air applications, the damperassembly should still be mounted on the sidereturn air access panel, per the instructions above,to insure moisture is not drawn into the unit duringoperation. The covering over the mounting holesonly need be removed. Do not remove the openingcover.