Carrier WeatherMaster 48HC07 Series Installation Instructions Manual

Also see for WeatherMaster 48HC07 Series: Service and maintenance instructions

11Although unit is weatherproof, avoid locations that permit wa-ter from higher level runoff and overhangs to fall onto the unit.Locate mechanical draft system flue assembly at least 4 ft(1.2 m) from any opening through which combustion productscould enter the building, and at least 4 ft (1.2 m) from any adja-cent building (or per local code). Locate the flue assembly atleast 10 ft (3.05 m) from an adjacent unit’s fresh air intakehood if within 3 ft (0.91 m) of same elevation (or per localcode). When unit is located adjacent to public walkways, flueassembly must be at least 7 ft (2.1 m) above grade.Select a unit mounting system that provides adequate height toallow installation of condensate trap per requirements. Refer toStep 11 — Install External Condensate Trap and Line for re-quired trap dimensions.ROOF MOUNTCheck building codes for weight distribution requirements.Unit operating weight is shown in Table 2.Step 2 — Plan for Sequence of Unit InstallationThe support method used for this unit will dictate different se-quences for the steps of unit installation. For example, on curb-mounted units, some accessories must be installed on the unitbefore the unit is placed on the curb. Review the following forrecommended sequences for installation steps.CURB-MOUNTED INSTALLATION1. Install curb2. Install field-fabricated ductwork inside curb3. Install accessory thru-base service connection package(affects curb and unit) (refer to accessory installationinstructions for details)4. Prepare bottom condensate drain connection to suitplanned condensate line routing (refer to Step 10 fordetails)5. Rig and place unit6. Install outdoor air hood7. Install flue hood8. Install gas piping9. Install condensate line trap and piping10. Make electrical connections11. Install other accessoriesPAD-MOUNTED INSTALLATION1. Prepare pad and unit supports2. Check and tighten the bottom condensate drain connectionplug3. Rig and place unit4. Convert unit to side duct connection arrangement5. Install field-fabricated ductwork at unit duct openings6. Install outdoor air hood7. Install flue hood8. Install gas piping9. Install condensate line trap and piping10. Make electrical connections11. Install other accessoriesFRAME-MOUNTED INSTALLATIONFrame-mounted applications generally follow the sequence fora curb installation. Adapt as required to suit specific installa-tion plan.Step 3 — Inspect UnitInspect unit for transportation damage. File any claim with trans-portation agency.Confirm before installation of unit that voltage, amperage and cir-cuit protection requirements listed on unit data plate agree withpower supply provided.On units with hinged panel option, check to be sure all latches aresnug and in closed position.Locate the carton containing the outside air hood parts; see Fig.13. Do not remove carton until unit has been rigged and located infinal position.Step 4 — Provide Unit SupportROOF CURB MOUNTAccessory roof curb details and dimensions are shown inFig. 5. Assemble and install accessory roof curb in accordancewith instructions shipped with the curb.NOTE: The gasketing of the unit to the roof curb is critical for awatertight seal. Install gasket supplied with the roof curb as shownin Fig. 5. Improperly applied gasket can also result in air leaks andpoor unit performance.Curb should be level. This is necessary for unit drain to func-tion properly. Unit leveling tolerances are show in Fig. 6. Referto Accessory Roof Curb Installation Instructions for additionalinformation as required.Table 2 — Operating Weights48HC** UNITS LB (KG)07 08 09 11/12Base Unit 765 (347) 925 (419.5) 925 (419.5) 1090 (495)EconomizerVertical 75 (34) 75 (34) 75 (34) 75 (34)Horizontal 122 (55) 122 (55) 122 (55) 122 (55)Powered Outlet 35 (16) 35 (16) 35 (16) 35 (16)Humidi-MiZer System 80 (36) 80 (36) 80 (36) 85 (39)Curb14-in./356 mm 143 (65) 143 (65) 143 (65) 143 (65)24-in./610 mm 245 (111) 245 (111) 245 (111) 245 (111)