Carrier WeatherMaker 48TC Series Installation Instructions Manual

Contents

17INSTALLATIONJob-Site SurveyComplete the following checks before installation.1. Consult local building codes and the NEC (National Elec-trical 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 inter-fere with unit lifting or rigging.Step 1 — Plan for Unit LocationSelect a location for the unit and its support system (curb or other)that provides for the minimum clearances required for safety. Thisincludes the clearance to combustible surfaces, unit performanceand service access below, around and above unit as specified inunit drawings. See Fig. 4, 8, and 12.NOTE: Consider also the effect of adjacent units. Be sure that unitis installed such that snow will not block the combustion intake orflue outlet.Unit may be installed directly on wood flooring or on class A, B,or C roof-covering material when roof curb is used.Do not install unit in an indoor location. Do not locate air inletsnear exhaust vents or other sources of contaminated air. For properunit operation, adequate combustion and ventilation air must beprovided in accordance with Section 5.3 (Air for Combustion andVentilation) of the National Fuel Gas Code, ANSI Z223.1 (Ameri-can National Standards Institute) and NFPA (National Fire Protec-tion Association) 54 TIA-54-84-1. In Canada, installation must bein accordance with the CAN1-B149 installation codes for gasburning appliances.Although unit is weatherproof, avoid locations that permit waterfrom 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 products could enterthe building, and at least 4 ft (1.2 m) from any adjacent building(or per local code). Locate the flue assembly at least 10 ft (3.05 m)from an adjacent unit’s fresh air intake hood if within 3 ft (0.91 m)of same elevation (or per local code). When unit is located adja-cent to public walkways, flue assembly must be at least 7 ft(2.1 m) above grade.Select a unit mounting system that provides adequate height to al-low installation of condensate trap per requirements. Refer toStep 10 — Install External Condensate Trap and Line – for re-quired trap dimensions.ROOF MOUNTCheck building codes for weight distribution requirements. Unitoperating 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 unit be-fore the unit is placed on the curb. Review the following for rec-ommended 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 installation instruc-tions for details)4. Rig and place unit5. Remove top skid6. Install outdoor air hood7. Install smoke detector tube8. Install combustion air hood9. Install flue hood10. Install gas piping11. Install condensate line trap and piping12. Make electrical connections13. Install other accessoriesPAD-MOUNTED INSTALLATION1. Prepare pad and unit supports2. Rig and place unit3. Remove duct covers and top skid4. Install smoke detector return air sensor tube5. Install field-fabricated ductwork at unit duct openings6. Install outdoor air hood7. Install combustion air hood8. Install flue hood9. Install gas piping10. Install condensate line trap and piping11. Make electrical connections12. Install other accessoriesFRAME-MOUNTED INSTALLATIONFrame-mounted applications generally follow the sequence for acurb installation. Adapt as required to suit specific installationplan.Step 3 — Inspect UnitInspect unit for transportation damage. File any claim with trans-portation agency. Confirm before installation of unit that voltage,amperage and circuit protection requirements listed on unit dataplate agree with power supply provided.On units with hinged panel option, check to be sure all latches aretight and in closed position.Locate the carton containing the outside air hood parts in the rearblower assembly. Do not remove carton until unit has been riggedand located in final position.Step 4 — Provide Unit SupportROOF CURB MOUNTAssemble and install accessory roof curb in accordance with in-structions shipped with the curb.Curb should be level. This is necessary for unit drain to functionproperly. Unit leveling tolerances are show in Fig. 14. Refer to Ac-cessory Roof Curb Installation Instructions for additional informa-tion as required.Accessory roof curb details and dimensions are shown inFig. 16-18.Install insulation, cant strips, roofing felt, and counter flashing asshown. Ductwork must be attached to curb and not to the unit.Thru-the-base power connection must be installed before the unitis set on the roof curb. If field-installed thru-the-roof curb gas con-nections are desired remove knockout in basepan located in thegas section, see Fig. 15 for location. Gas connections and powerconnections to the unit must be field installed after the unit is in-stalled on the roof curb.If electric and control wiring is to be routed through the basepan,remove knockouts in basepan located in control box area, seeFig. 15. Depending on the unit size, see Fig. 2, 6, or 10 for the lo-cation of the knockouts. Attach the service connections to thebasepan.