Carrier WeatherMaster 48HC07-12 Installation Instructions Manual

8Fig. 4 — Service Clearance Dimensional Drawing — Sizes 07-12INSTALLATIONJobsite Survey — Complete the following checks beforeinstallation.1. Consult local building codes and the NEC (NationalElectrical Code) ANSI/NFPA 70 for special installationrequirements.2. Determine unit location (from project plans) or select unitlocation.3. Check for possible overhead obstructions which may in-terfere with unit lifting or rigging.Step 1 — Plan for Unit Location — Select a loca-tion for the unit and its support system (curb or other) that pro-vides for the minimum clearances required for safety. This in-cludes the clearance to combustible surfaces, unit performanceand service access below, around and above unit as specified inunit drawings. See Fig. 4.NOTE: Consider also the effect of adjacent units.Be sure that the unit is installed such that snow will notblock the combustion intake or flute outlet.Unit may be installed directly on wood flooring or on ClassA, B, or C roof-covering material when roof curb is used.Do not install unit in an indoor location. Do not locate air in-lets near exhaust vents or other sources of contaminated air. Forproper unit operation, adequate combustion and ventilation airmust be provided in accordance with Section 5.3 (Air for Com-bustion and Ventilation) of the National Fuel Gas Code, ANSIZ223.1 (American National Standards Institute) and NFPA(National Fire Protection Association) 54 TIA-54-84-1. InCanada, installation must be in accordance with the CAN1-B149 installation codes for gas burning appliances.Although unit is weatherproof, avoid locations that permitwater from higher level runoff and overhangs to fall onto theunit.NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overheadobstruction or for vertical clearances.LOCATION DIMENSION CONDITIONA48-in. (1219 mm)18-in. (457 mm)18-in. (457) mm12-in. (305 mm)Unit disconnect is mounted on panelNo disconnect, convenience outlet optionRecommended service clearanceMinimum clearanceB42-in. (1067 mm)36-in. (914 mm)SpecialSurface behind servicer is grounded (e.g., metal, masonry wall)Surface behind servicer is electrically non-conductive (e.g., wood, fiber-glass)Check sources of flue products within 10-ft of unit fresh air intake hoodC 36-in. (914 mm)18-in. (457 mm)Side condensate drain is usedMinimum clearanceD48-in. (1219 mm)42-in. (1067 mm)36-in. (914 mm)SpecialNo flue discharge accessory installed, surface is combustible materialSurface behind servicer is grounded (e.g., metal, masonry wall, anotherunit)Surface behind servicer is electrically non-conductive (e.g., wood, fiber-glass)Check for adjacent units or building fresh air intakes within 10-ft (3 m) of thisunit’s flue outletCBAD