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INSTALLATION INSTRUCTIONSRGS089-180R-410A Single Package Rooftop withGas Heat/Electric CoolingRGS090/102/120/150/180 units for installation in the United States contain use of the 2-Speed Indoor FanMotor System. This complies with the U.S. Department of Energy (DOE) efficiency standard of 2018.RGS090/102/120/150/180 units for installation outside the United States may or may not contain use of the2-Speed Indoor Fan Motor System as they are not required to comply with the U.S. Department of Energy(DOE) efficiency standard of 2018.RGS089/100/119 units for installation inside or outside the United States do not contain the 2-Speed IndoorFan Motor System as they comply with the U.S. Department of Energy (DOE) 2018 mandatory efficiencystandard without their use.For specific details on operation of the 2-Speed Indoor Fan Motor System refer to the Variable FrequencyDrive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and Troubleshootingmanual.CONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . 1GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Rated Indoor Airflow (CFM) . . . . . . . . . . . . . . . . . . . . . . . . 2Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Step 1— Plan for Unit Location . . . . . . . . . . . . . . . . . . . 11Step 2 — Plan for Sequence of Unit Installation . . . . . . . 11Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . . . . 12Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . . . . 15Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . 15Step 7 — Convert to Horizontal and Connect Ductwork(When Required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . . . . . 17Step 9 — Install Flue Hood. . . . . . . . . . . . . . . . . . . . . . . . . 19Step 10 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . . 20Step 11 — Install External Condensate Trap and Line . . 23Step 12 — Make Electrical Connections . . . . . . . . . . . . . 23Step 13 — Adjust Factory-Installed Options . . . . . . . . . . 47Step 14 — Install Accessories . . . . . . . . . . . . . . . . . . . . . . 47Step 15 — Check Belt Tension . . . . . . . . . . . . . . . . . . . . . 48Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . CL-1SAFETY CONSIDERATIONSImproper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or otherconditions which may cause personal injury or property damage.Consult a qualified installer, service agency, or your distributoror branch for information or assistance. The qualified installer oragency must use factory-authorized kits or accessories whenmodifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.Follow all safety codes. Wear safety glasses and work gloves.Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult localbuilding codes and appropriate national electrical codes (inUSA, ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.It is important to recognize safety information. This is thesafety-alert symbol. When you see this symbol on the unitand in instructions or manuals, be alert to the potential for personal injury.Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with the safetyalert symbol. DANGER identifies the most serious hazardswhich will result in severe personal injury or death. WARNINGsignifies hazards which could result in personal injury or death.CAUTION is used to identify unsafe practices, which may resultin minor personal injury or product and property damage. NOTEis used to highlight suggestions which will result in enhanced installation, reliability, or operation.WARNINGFailure to follow this warning could result in personal injuryor death. Disconnect gas piping from unit when leak testingat pressure greater than 0.5 psig (3450 Pa). Pressures greaterthan 0.5 psig (3450 Pa) will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than 0.5 psig (3450 Pa), it must be replacedbefore use. When pressure testing field-supplied gas pipingat pressures of 0.5 psig (3450 Pa) or less, a unit connected tosuch piping must be isolated by closing the manual gasvalve.WARNINGFailure to follow this warning could cause personal injury ordeath. Before performing service or maintenance operationson unit, always turn off main power switch to unit and installlock(s) and lockout tag(s). Unit may have more than onepower switch.WARNINGFailure to follow this warning could cause personal injury,death and/or equipment damage.R-410A refrigerant systems operate at higher pressures thanstandard R-22 systems. Do not use R-410A service equipment or components on R-410A refrigerant equipment.509 01 3616 0003/23/2018

WARNINGWARNINGFailure to follow this warning could cause personal injuryor death.Relieve pressure and recover all refrigerant before systemrepair or final unit disposal.Wear safety glasses and gloves when handling refrigerants.Keep torches and other ignition sources away from refrigerants and oils.FIRE HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Manifold pressure tap set screw must be tightened and1/ in. NPT pipe plug must be installed to prevent gas leaks.8WARNINGCARBON-MONOXIDE POISONING HAZARDFailure to follow instructions could result in severe personal injury or death due to carbon-monoxide poisoning, ifcombustion products infiltrate into the building.MANIFOLD PRESSURETAP SET SCREWMANIFOLDCheck that all openings in the outside wall around the vent(and air intake) pipe(s) are sealed to prevent infiltration ofcombustion products into the building.GAS VALVECheck that furnace vent (and air intake) terminal(s) are notobstructed in any way during all seasons.GENERALThese installation instructions cover the RGS units with gasheat and electric cooling. Units are pre-wired and pre-chargedwith environmentally balanced R-410A refrigerant at the factory. See Fig. 1 for model number nomenclature. See Fig. 2-4 forunit dimensions. See Fig. 5 and 6 for service clearances.CAUTIONFailure to follow this caution may result in personal injury.Sheet metal parts may have sharp edges or burrs. Use careand wear appropriate protective clothing, safety glasses andgloves when handling parts and servicing air conditioningequipment.Rated Indoor Airflow (cfm)Table 1 lists the rated indoor airflow used for the AHRI efficiency rating for the units covered in this document.Table 1 — AHRI Efficiency — Rated Indoor AirflowMODEL NUMBERRGS 089RGS 090RGS 100RGS 102RGS 119RGS 120RGS 150RGS 180WARNINGFIRE HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Inlet pressure tap set screw must be tightened and 1/8 in. NPTpipe plug must be installed to prevent gas leaks.FULL LOAD AIRFLOW nstallationComplete the following checks before installation.1. Consult local building codes and the NEC (NationalElectrical Code) ANSI/NFPA 70 for special installation requirements.2. Determine unit location (from project plans) or select unitlocation.3. Check for possible overhead obstructions which may interfere with unit lifting or rigging.GAS VALVEINLET PRESSURETAP SET SCREW2

MODEL SERIESRGS090HDAA0AAAPosition Number1234567891011121314R RooftopG Gas/ElectricS Standard DOE/ASHRAE 90.1 EfficiencyTypeEfficiency089 90,000 BTUH 7.5 Tons (1 circuit/two stage cooling)090 90,000 BTUH 7.5 Tons (2 compressor)100 102,000 BTUH 8.5 Tons (1 circuit/two stage cooling)102 102,000 BTUH 8.5 Tons (2 compressor)119 120,000 BTUH 10 Tons (1 circuit/two stage cooling)120 120,000 BTUH 10 Tons (2 compressor)150 150,000 BTUH 12.5 Tons (2 compressor)180 180,000 BTUH 15 Tons (2 compressor)Nominal Cooling CapacityH 208/230-3-60L 460-3-60S 575-3-60VoltageD Low Heat, Aluminum HxE Medium Heat, Aluminum HxF High Heat, Aluminum HxS Low Heat, Stainless Steel HxR Med Heat, Stainless Steel HxT High Heat, Stainless Steel HxHeating CapacityA Standard Motor/DriveB High Static Motor/DriveC Medium Static Motor/DriveE High Static - High Efficiency Motor/DriveG High Static Motor/Drive with Hot Gas Re-Heat (not available on 089, 100, 119 models)H High Static Motor/Drive with Hot Gas RE-Heat (not available on 089, 100, 119 models)Motor OptionA NoneB Low Leak Economizer w/Barometric relief, OA Temperature SensorE Low Leak Economizer w/Barometric relief and CO2 Sensor, OA Temperature SensorH Low Leak Economizer w/Barometric relief, Enthalpy SensorL Low Leak Economizer w/Barometric relief and CO2 Sensor, Enthalpy SensorP 2-Position Damper (non U.S. models only)U Temperature Ultra Low Leak Economizer w/Barometric reliefW Enthalpy Ultra Low Leak Economizer w/Barometric reliefOutdoor Air Options / Control (see Specification Sheet for details)0A No OptionsFactory Installed Options (see Specification Sheet for details)A Aluminum/Copper Condenser and Evaporator CoilB Precoat Alum/Cu Condenser and Alum/CU EvaporatorC E-Coated Alum/Cu Condenser and Alum/CU EvaporatorD E-Coated Alum/Cu Condenser and EvaporatorE Cu/Cu Condenser and Alum/Cu EvaporatorF Copper/Copper Condenser and EvaporatorStandard Condenser / Evaporator Coil ConfigurationA Single-Speed Indoor Fan Motor, for W7212 controlsB Single-Speed Indoor Fan Motor, for W7220 controlsT Two-Speed Indoor Motor Controller (VFD) - Standard on U.S. models (except 089, 100, 119 models)Fig. 1 — Model Number Nomenclature3Indoor Fan Motor

RGS100/102RGS089/090RGS119/120Fig. 2 — Unit Dimensional Drawing Sizes 089-1204

RGS089RGS100RGS119RGS090RGS102RGS120Fig. 2 — Unit Dimensional Drawing Sizes 089-120 (cont)5

RGS150Fig. 3 — Unit Dimensional Drawing Size 1506

RGS150Fig. 3 — Unit Dimensional Drawing Size 150 (cont)7

Fig. 4 — Unit Dimensional Drawing Size 1808

RGS180Fig. 4 —Unit Dimensional Drawing Size 180 (cont)9

CDBALOCATIONABCDDIMENSIONin. (mm)48 (1219)18 (457)18 (457)12 (305)42 (1067)36 (914)Special36 (914)18 (457)48 (1219)42 (1067)36 (914)SpecialCONDITIONUnit disconnect is mounted on panel.No disconnect, convenience outlet option.Recommended service clearance.Minimum clearance.Surface behind servicer is grounded (e.g., metal, masonry wall).Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass).Check for sources of flue products within 10-ft of unit fresh air intake hood.Side condensate drain is used.Minimum clearance.No flue discharge accessory installed, surface is combustible materialSurface behind servicer is grounded (e.g., metal, masonry wall, another unit).Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass).Check for adjacent units or building fresh air intakes within 10-ft (3 m) of this unit’s flue outlet.NOTE: Unit is not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead obstruction or for vertical clearances.Fig. 5 — Service Clearances — RGS 089-150 Units10

CDBALOCATIONABCDDIMENSIONin. (mm)48 (1219)18 (457)18 (457)12 (305)42 (1067)36 (914)Special36 (914)18 (457)48 (1219)42 (1067)36 (914)SpecialCONDITIONUnit disconnect is mounted on panel.No disconnect, convenience outlet option.Recommended service clearance.Minimum clearance.Surface behind servicer is grounded (e.g., metal, masonry wall).Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass).Check for sources of flue products within 10-ft of unit fresh air intake hood.Side condensate drain is used.Minimum clearance.No flue discharge accessory installed, surface is combustible materialSurface behind servicer is grounded (e.g., metal, masonry wall, another unit).Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass).Check for adjacent units or building fresh air intakes within 10-ft (3 m) of this unit’s flue outlet.NOTE: Unit is not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead obstruction or for vertical clearances.Fig. 6 — Service Clearances — RGS 180 UnitsINSTALLATION(1.2 m) from any adjacent building (or per local code). Locatethe flue assembly at least 10 ft (3.05 m) from an adjacent unit’sfresh air intake hood if within 3 ft (0.91 m) of same elevation (orper local code). When unit is located adjacent to public walkways, flue assembly must be at least 7 ft (2.1 m) above grade.Select a unit mounting system that provides adequate heightto allow installation of condensate trap per requirements. SeeStep 11 — Install External Condensate Trap and Line onpage 23 for required trap dimensions.Step 1 — Plan for Unit Location — Select a location forthe unit and its support system (curb or other) that provides forthe minimum clearances required for safety. This includes theclearance to combustible surfaces, unit performance and serviceaccess below, around and above unit as specified in unit drawings. See Fig. 2-4.NOTE: Consider also the effect of adjacent units.Be sure that unit is installed such that snow will not block thecombustion intake or flue 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 inlets 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 Combustion 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. In Canada,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.For sizes 089-150 only, locate mechanical draft system flueassembly at least 4 ft (1.2 m) from any opening through whichcombustion products could enter the building, and at least 4 ftROOF MOUNT — Check building codes for weight distribution requirements. Unit operating weight is shown in Table 2.Step 2 — Plan for Sequence of Unit Installation —The support method used for this unit will dictate differentsequences for the steps of unit installation. For example, oncurb-mounted units, some accessories must be installed on theunit before the unit is placed on the curb. Review the followingfor recommended sequences for installation steps.CURB-MOUNTED INSTALLATION1. Install roof curb2. Install field-fabricated ductwork inside curb3. Install accessory thru-base service connection package (affects curb and unit) (refer to accessory installation instructions for details)4. Prepare bottom condensate drain connection to suitplanned condensate line routing11

5.6.7.8.9.10.11.Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to theunit.Rig and place unitInstall outdoor air hoodInstall flue hoodInstall gas pipingInstall condensate line trap and pipingMake electrical connectionsInstall other accessoriesCPAD-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 accessoriesABA-Bin. (mm)0.5 (13)B-Cin. (mm)1.0 (25)A-Cin. (mm)1.0 (25)Fig. 7 — Unit Leveling TolerancesIMPORTANT: If the unit has the factory-installed Thruthe-base option, make sure to complete installation ofthe option before placing the unit on the roof curb.See the following sections:Factory-Option Thru-Base Connections(Gas Connection) on page 21 for sizes 089-150 andpage 21 for size 180FRAME-MOUNTED INSTALLATION —Framemounted applications generally follow the sequence for a curbinstallation. Adapt as required to suit specific installation plan.Factory-Option Thru-Base Connections(Electrical Connections) on page 28 for sizes 089-150and page 29 for size 180Step 3 — Inspect Unit — Inspect unit for transportationdamage. File any claim with transportation agency. Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with powersupply provided.NOTE: For size 180, if gas and/or electrical connections are not going to occur at this time, tape or otherwise cover the fittings so that moisture does not get intothe building or conduit in the interim.Step 4 — Provide Unit SupportFOR SIZES 089-150 ONLY — The accessory thru-the-basepower and gas connection package must be installed before theunit is set on the roof curb. If field-installed thru-the-roof curbgas connections are desired, use factory-supplied 1/2-in. pipecoupling and gas plate assembly to mount the thru-the-roof curbconnection to the roof curb. Gas connections and power connections to the unit must be field installed after the unit is installedon the roof curb.If electric and control wiring is to be routed through the basepan, attach the accessory thru-the-base service connections tothe basepan in accordance with the accessory installationinstructions.ROOF CURB MOUNT — Accessory roof curb details anddimensions are shown in Fig. 2-4. Assemble and install accessory roof curb in accordance with instructions shipped with thecurb.Curb should be level. This is necessary for unit drain to function properly. Unit leveling tolerances are show in Fig. 7. Referto Accessory Roof Curb Installation Instructions for additionalinformation as required.NOTE: The gasketing of the unit to the roof curb is criticalfor a watertight seal. Install gasket supplied with the roofcurb as shown in Fig. 8 and 9. Improperly applied gasket canalso result in air leaks and poor unit performance.Table 2 — Operating WeightsRGSOne Compressor Units*Two Compressor Units†EconomizerVerticalHorizontalHot Gas Re-Heat System**Powered OutletCurb14-in. (356 mm)16-in. (610 mm)089/090777 (352)900 (408)100/102805 (365)970 (440)UNITS — lb (kg)119/120850 (386)980 (444)150N/A1075 (487)180N/A1305 (592)75 (34)122 (55)80 (36)35 (16)75 (34)122 (55)80 (36)35 (16)75 (34)122 (55)80 (36)35 (16)75 (34)122 (55)85 (39)35 (16)130 (47)242 (110)90 (41)35 (16)143 (65)245 (111)143 (65)245 (111)143 (65)245 (111)143 (65)245 (111)180 (82)255 (116)* One Compressor Units: 089, 100, 119† Two Compressor Units: 090, 102, 120, 150, 180** Hot Gas Re-Heat System is not available for size 089, 100, and 119 units.12

Fig. 8 — RGS 089-150 — Roof Curb Details1324"[610]CRRFCURB002A014 355.6]15.19"[385.8]4.96"[126.0]21.74"[552.2]SUPPLY AIR20.41"[518.3]SUPPLY "[356]CRRFCURB001A015.42"[137.7]AROOF CURBACCESSORY #40.69"[1033.5]RETURN AIR3.00"[76.2]13.78"[350.0]16.03"[407.2]ERETURN AIROPENINGE32.19"[817.6]70.87"[1800.2](FIELD SUPPLIED)DUCTGASKET(SUPPLIED WITH CURB)VIEW "B"CORNER DETAILNOTES:1. ROOFCURB ACCESSORY IS SHIPPED DISASSEMBLED.2. INSULATED PANELS: 25.4 [1"] THK. POLYURETHANE FOAM, 44.5 [1-3/4] # DENSITY.3. DIMENSIONS IN [ ] ARE IN MILLIMETERS.4. ROOFCURB: 18 GAGE STEEL.5. ATTACH DUCTWORK TO CURB. (FLANGES OF DUCT REST ON CURB).6. SERVICE CLEARANCE 4 FEET ON EACH SIDE.7.DIRECTION OF AIR FLOW.8. CONNECTOR PACKAGE CRBTMPWR001A01 IS FOR THRU-THE-CURB GAS TYPEPACKAGE CRBTMPWR003A01 IS FOR THRU-THE-BOTTOM TYPE GAS CONNECTIONS.ROOFING MATERIAL(FIELD SUPPLIED)CANT STRIP(FIELD SUPPLIED)ROOFING FELT(FIELD SUPPLIED)COUNTER FLASHING(FIELD SUPPLIED)TYPICAL (4) SIDESE-ESECTIONSCALE 0.250NAIL (FIELD SUPPLIED)RIGID INSULATION(FIELD "1-3/4"[44.4]CRBTMPWR003A01CRBTMPWR001A01CONNECTOR PKG. ACC.8 9/16"[217.5] WIDEINSULATED DECK PANELSEE VIEW "B"3'-1 3/16"[944.6]SUPPLY AIRGAS SERVICE PLATETHRU THE CURBDRILL HOLE2" [50.8] @ASSEMBLY (IFREQUIRED)(SEE NOTE #8)1/2" [12.7] NPT3/4" [19] NPTGAS FITTING1-3/4"[44.5]RETURN AIR1' 4-13/16"[427] INSIDE3/4" [19] NPTPOWER WIRINGFITTINGCERTIFIED DRAWING11 3/4"[298.5] WIDEINSULATED DECK PANELSTHRU THE BOTTOMTHRU THE CURBGAS CONNECTION TYPE5' 7-3/8"[1711.3]2-3/8"[61]1/2" [12.7] NPTCONTROL WIRINGFITTINGSEE NOTE #21/2" [12.7] NPT1-3/4"[44.4]ACCESSORY CONVENIENCEOUTLET WIRING CONNECTOR

Fig. 9 — RGS 180 — Roof Curb Details14

SLAB MOUNT (HORIZONTAL UNITS ONLY) —Provide a level concrete slab that extends a minimum of 6 in.(150 mm) beyond unit cabinet. Install a gravel apron in front ofcondenser coil air inlet to prevent grass and foliage from obstructing airflow.NOTE: Horizontal units may be installed on a roof curb ifrequired.CAUTIONFailure to follow this caution may result in damage to roofing materials.Membrane roofs can be cut by sharp sheet metal edges. Becareful when placing any sheet metal parts on such roof.ALTERNATE UNIT SUPPORT (IN LIEU OF CURBOR SLAB MOUNT) — A non-combustible sleeper rail canbe used in the unit curb support area. If sleeper rails cannot beused, support the long sides of the unit with a minimum of 3equally spaced 4-in. x 4-in. (102 mm x 102 mm) pads on eachside.Step 6 — Rig and Place Unit — Keep unit upright and donot drop. Spreader bars are required for 089-150 size units; size180 units do not require spreader bars. Rollers may be used tomove unit across a roof. Level by using unit frame as a reference. See Table 2 and Fig. 10 for additional information.Lifting holes are provided in base rails as shown in Fig. 10.Refer to rigging instructions on unit.Rigging materials under unit (cardboard or wood to preventbase pan damage) must be removed PRIOR to placing the uniton the roof curb.When using the standard side drain connection, ensure thered plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can be tightenedwith a 1/2-in. square socket drive extension. For further detailssee Step 11 — Install External Condensate Trap and Line onpage 23.Before setting the unit onto the curb, recheck gasketing oncurb.Step 5 — Field Fabricate DuctworkNOTE: Cabinet return-air static pressure (a negative condition) shall not exceed 0.35 in. wg (87 Pa) with economizer or0.45 in. wg (112 Pa) without economizer.For vertical ducted applications, secure all ducts to roof curband building structure. Do not connect ductwork to unit.Fabricate supply ductwork so that the cross sectional dimensions are equal to or greater than the unit supply duct opening dimensions for the first 18 in. (458 mm) of duct length from theunit basepan.Insulate and weatherproof all external ductwork, joints, androof openings with counter flashing and mastic in accordancewith applicable codes.Ducts passing through unconditioned spaces must be insulated and covered with a vapor barrier.If a plenum return is used on a vertical unit, the return shouldbe ducted through the roof deck to comply with applicable firecodes.A minimum clearance is not required around ductwork.CAUTIONFailure to follow this caution may result in equipment damage.All panels must be in place when rigging. Unit is notdesigned for handling by fork truck."B"36"- 54"(914-1371)REQUIREDSPREADERBARSPLACE ALL SEAL STRIP IN PLACEBEFORE PLACING UNIT ON ROOF CURB.DETAIL "A"DUCT END"C""A"UNITSEE DETAIL "A"MAX ES:1. SPREADER BARS REQUIRED FOR SIZES 089-150 — Top damage will occur if spreader bars are not used. Not required for size 180.2. Dimensions in () are in millimeters.3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity. Usewooden top to prevent rigging straps from damaging unit.Fig. 10 — Rigging Details15LB41.549.549.541.549.549.553.059.5

POSITIONING ON CURBOriginalPositionFor Size 089-150, position unit on roof curb so that the following clearances are maintained: 1/4 in. (6.4 mm) clearance between the roof curb and the base rail inside the front and back,0.0 in. clearance between the roof curb and the base rail insideon the duct end of the unit. This will result in the distance between the roof curb and the base rail inside on the condenser endof the unit being approximately 1/4 in. (6.4 mm).Although unit is weatherproof, guard against water fromhigher level runoff and overhangs.Flue vent discharge must have a minimum horizontal clearance of 4 ft (1220 mm) from electric and gas meters, gas regulators, and gas relief equipment. Minimum distance between unitand other electrically live parts is 48 in. (1220 mm).Flue gas can deteriorate building materials. Orient unit suchthat flue gas will not affect building materials. Locate mechanical draft system flue assembly at least 48 in. (1220 mm) from anadjacent building or combustible material.NOTE: Installation of accessory flue discharge deflector kitwill reduce the minimum clearance to combustible materialto 18 in. (460 mm).After unit is in position, remove rigging skids and shippingmaterials.For Size 180, full perimeter curbs CRRFCURB074A00 and075A00, the clearance between the roof curb and the front andrear base rails should be 1/4 in. (6.4 mm). The clearance betweenthe curb and the end base rails should be 1/2 in. (13 mm). For retrofit applications with curbs CRRFCURB003A01 and 4A01,the unit should be position as shown in Fig. 11. Maintain the15.5 in. (394 mm) and 8 5/8 in. (220 mm) clearances and allowthe 22 5/16 in. (567 mm) dimension to float if necessary.New Position(moved 12.5 in.)Fig. 12 — Alternative Condensate Drain Hole PositionsIMPORTANT: If the unit has the factory-installed thruthe-base option, make sure to complete installation ofthe option before placing the unit on the roof curb.See the following sections:Factory-Option Thru-Base Connections(Gas Connection) on page 21 for sizes 089-150 andpage 21 for size 180Factory-Option Thru-Base Connections(Electrical Connections) on page 28 for sizes 089-150and page 29 for size 180NOTE: If gas and/or electrical connections are notgoing to occur at this time, tape or otherwise cover thefittings so that moisture does not get into the buildingor conduit in the interim.Step 7 — Convert to Horizontal and ConnectDuctwork (When Required)SIZES 089-150 CONVERSION — Unit is shipped in thevertical duct configuration. Unit without factory-installed economizer or return air smoke detector option may be field-converted to horizontal ducted configuration. To convert to horizontalconfiguration, remove screws from side duct opening coversand remove covers. Using the same screws, install covers onvertical duct openings with the insulation-side down. Sealsaround duct openings must be tight. See Fig. 13.Fig. 11 — Retrofit Installation Dimensions(Size 180 Shown)If the alternative condensate drain location through the bottom of the unit is used in conjunction with a retrofit curb, thehole in the curb must be moved 12.5 in. (320 mm) towards theduct end of the unit. See Fig. 12.Although unit is weatherproof, guard against water fromhigher level runoff and overhangs.Remove all shipping materials and top skid. Remove extracenter post from the condenser end of the unit so that the condenser end of the unit matches Fig. 39 and 40. Recycle or dispose of all shipping materials.REMOVABLE HORIZONTALRETURN DUCT OPENING COVERREMOVABLE HORIZONTALSUPPLY DUCT OPENING COVERFig. 13 — Horizontal Conversion Panels16

SIZE 180 CONVERSION — Unit is shipped in the verticalduct configuration. Unit without factory-installed economizer orreturn air smoke detector option may be field-converted to V002A00. To convert to horizontal configuration,remove screws from side duct opening covers and removecovers.Discard the supply duct cover. Install accessoryCRDUCTCV002A00 to cover the vertical supply duct opening.Use the return duct cover removed from the end panel to coverthe vertical return duct opening.ALL UNITS — Field-supplied flanges should be attached tohorizontal duct openings and all ductwork should be secured tothe flanges. Insulate and weatherproof all external ductwork,joints, and roof or building openings with counter flashing andmastic in accordance with applicable codes.Do not cover or obscure visibility to the unit’s informativedata plate when insulating horizontal ductwork.FILTER ACCESS PANELINDOOR COIL ACCESS PANELStep 8 — Install Outside Air HoodECONOMIZER AND TWO POSITION DAMPER HOODPACKAGE REMOVAL — FACTORY OPTION(SIZE 089-150)Fig. 14 — Typical Access Panel Locations(Size 180 Shown)1. The hood is shipped in knock-down form and must befield assembled. The indoor coil access panel is used asthe hood top while the hood sides, divider and filter arepackaged together, attached to a metal support trayusing plastic stretch wrap, and shipped in the return aircompartment behind the indoor coil access panel. Thehood assembly

on unit, always turn off main power switch to unit and install lock(s) and lockout tag(s). Unit may have more than one power switch. WARNING Failure to follow this warning could cause personal injury, death and/or equipment damage. R-410A refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-410A service equip-