Carrier PH5G-B Installation Instruction

PH5G-B: Installation InstructionManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.8Rigging/Lifting of Unit (See Fig. 5)Lifting holes are provided in base rails as shown.1. Attach shackles, clevis pins, and straps to the base rails of the unit.Be sure materials are rated to hold the weight of the unit (SeeFig. 5).2. Attach a clevis of sufficient strength in the middle of the straps.Adjust the clevis location to ensure unit is lifted level with theground.After the unit is placed on the roof curb or mounting pad, remove the topskid.Step 5 – Select and Install DuctworkThe design and installation of the duct system must be in accordancewith the standards of the NFPA for installation of non-residence type airconditioning and ventilating systems, NFPA 90A or residence-type,NFPA 90B and/or local codes and ordinances.Select and size ductwork, supply-air registers, and return air grillesaccording to ASHRAE (American Society of Heating, Refrigeration,and Air Conditioning Engineers) recommendations.The unit has duct flanges on the supply- and return-air openings on theside of the unit.When designing and installing ductwork, consider the following:1. All units should have field-supplied filters or accessory filter rackinstalled in the return-air side of the unit. Recommended sizes forfilters are shown in Table 3.2. Avoid abrupt duct size increases and reductions. Abrupt change induct size adversely affects air performance.IMPORTANT: Use flexible connectors between ductwork and unit toprevent transmission of vibration. Use suitable gaskets to ensure weathertight and airtight seal. When electric heat is installed, use fireproofcanvas (or similar heat resistant material) connector between ductworkand unit discharge connection. If flexible duct is used, insert a sheetmetal sleeve inside duct. Heat resistant duct connector (or sheet metalsleeve) must extend 24-in. (610 mm) from electric heater element.3. Size ductwork for cooling air quantity (cfm). The minimum airquantity for proper electric heater operation is listed in Table 4.Heater limit switches may trip at air quantities below thoserecommended.4. Seal, insulate, and weatherproof all external ductwork. Seal,insulate and cover with a vapor barrier all ductwork passingthrough conditioned spaces. Follow latest Sheet Metal and AirConditioning Contractors National Association (SMACNA) andAir Conditioning Contractors Association (ACCA) minimuminstallation standards for residential heating and air conditioningsystems.5. Secure all ducts to building structure. Flash, weatherproof, andvibration-isolate duct openings in wall or roof according to goodconstruction practices.Configuring Units for Downflow (Vertical) Discharge1. Open all electrical disconnects and install lockout tag beforestarting any service work.2. Remove horizontal (metal) ductcovers to access vertical(downflow) discharge duct knockouts in unit basepan. (See Fig. 6.)3. To remove downflow return and supply knockout covers, breakfront and right side connecting tabs with a screwdriver and hammer.Push cover down to break rear and left side tabs.A09510A09518Fig. 6 – Supply and Return Duct OpeningNOTE: These panels are held in place with tabs similar to an electricalknockout. Reinstall horizontal duct covers (Fig. 6) shipped on unit fromfactory. Insure openings are air and watertight.NOTE: The design and installation of the duct system must be inaccordance with the standards of the NFPA for installation ofnonresidence-type air conditioning and ventilating systems, NFPA 90Aor residence-type, NFPA 90B; and/or local codes and ordinances.Adhere to the following criteria when selecting, sizing, and installing theduct system:1. Units are shipped for side shot installation.2. Select and size ductwork, supply-air registers, and return-air grillesaccording to American Society of Heating, Refrigeration and AirConditioning Engineers (ASHRAE) recommendations.WARNING!PERSONAL INJURY HAZARDFailure to follow this warning could result in personal injury or death.For vertical supply and return units, tools or parts could drop intoductwork. Install a 90 degree turn in the return ductwork between theunit and the conditioned space. If a 90 degree elbow cannot be installed,then a grille of sufficient strength and density should be installed toprevent objects from falling into the conditioned space. Units withelectric heaters require 90 degree elbow in supply duct.WARNING!ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injury or death.Before performing service or maintenance operations on the system,turn off main power to unit and install lockout tag. There may be morethan one disconnect switch.Horizontal Duct Covers