Carrier WeatherMaker 48A020 Installation Instructions Manual

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-53480274-01 Printed in U.S.A. Form 48A-21SI Pg 1 11-21 Replaces: 48A-20SIInstallation InstructionsCONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1ACOUSTICAL CONSIDERATIONS . . . . . . . . . . . . . . . 3Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . 4• ROOF CURB• ALTERNATE UNIT SUPPORTStep 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 4• POSITIONING• ROOF MOUNTStep 3 — Field Fabricate Ductwork . . . . . . . . . . . . . 22Step 4 — Make Unit Duct Connections . . . . . . . . . . 22• 48A2, A3, A6, AND A7 UNITS• 48A4, A5, A8, AND A9 UNITS• 48A2020-050 UNITS• 48A2060 UNITSStep 6 — Trap Condensate Drain . . . . . . . . . . . . . . 23Step 7 — Install Gas Piping . . . . . . . . . . . . . . . . . . . 23• OPTIONAL STAGED GAS UNITSStep 8 — Install Supply-Air Thermistors (Staged andModulating Gas Units Only) . . . . . . . . . . . . . . . . . 24Step 9 — Make Electrical Connections . . . . . . . . . . 24• POWER WIRING• FIELD POWER SUPPLY• FIELD CONTROL WIRINGStep 10 — Make Outdoor-Air Inlet Adjustments . . 28• ECONOMIZER AND FIXED OUTDOOR AIR DAMPERStep 11 — Position Power Exhaust/Barometric ReliefDamper Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Step 12 — Route VAV Static Pressure Sensors . . . 32• VAV DUCT PRESSURE TRANSDUCER• VAV BUILDING PRESSURE TRANSDUCERStep 13 — Install All Accessories . . . . . . . . . . . . . . 32• FIELD-FABRICATED WIND BAFFLES• DUCTWORKBACnet Communication Option Wiring . . . . . . . . . 35• WIRING THE UPC OPEN CONTROLLER TO THE MS/TP NETWORK• MS/TP WIRING RECOMMENDATIONSUsing ZS Sensor or an Equipment Touch . . . . . . . 37SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipment can behazardous due to system pressure and electrical components. Onlytrained and qualified service personnel should install, repair, orservice air-conditioning equipment.Untrained personnel can perform basic maintenance functions ofcleaning coils and filters and replacing filters. All other operationsshould be performed by trained service personnel. When workingon air-conditioning equipment, observe precautions in theliterature, tags and labels attached to the unit, and other safetyprecautions that may apply.Follow all safety codes. Wear safety glasses and work gloves. Usequenching cloth for unbrazing operations. Have fire extinguisheravailable for all brazing operations.It is important to recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and ininstructions or manuals, be alert to the potential for personalinjury.Understand the signal words DANGER, WARNING, CAUTION,and NOTE. These words are used with the safety-alert symbol.DANGER identifies the most serious hazards which will result insevere personal injury or death. WARNING signifies hazardswhich could result in personal injury or death. CAUTION is usedto identify unsafe practices, which may result in minor personalinjury or product and property damage. NOTE is used to highlightsuggestions which will result in enhanced installation, reliability,or operation.WARNINGBefore performing service or maintenance operations on unit,turn off main power switch to unit. Electrical shock couldcause personal injury.WARNINGImproper installation, adjustment, alteration, service, or main-tenance can cause property damage, personal injury, or loss oflife. Refer to the User’s Information Manual provided with thisunit for more details.WARNINGUNIT OPERATION AND SAFETY HAZARDFailure 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-22 service equipment orcomponents on R-410A refrigerant equipment.WeatherMaker®48A020-060Single Package Gas Heating/Electric CoolingRooftop Units with ComfortLink Controlsand Puron® Refrigerant (R-410A)