Carrier WeatherMaster 48HC07-12 Installation Instructions Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-53480177-01 Printed in U.S.A. Form 48HC-7-12-05SI Pg 1 3-18 Replaces: 48HC-7-12-04SIInstallation InstructionsCONTENTSPageSAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . 1-8Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . . ..2Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-62Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . . 8Step 2 — Plan for Sequence of Unit Installation . 9Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 9Step 5 — Field Fabricate Ductwork. . . . . . . . . . . . . . 11Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . 11Step 7 — Install Outside Air Hood. . . . . . . . . . . . . . 13Step 8 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . 14Step 9 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . 14Step 10 — Install External Condensate Trap andLine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Step 11 — Make Electrical Connections . . . . . . . . . 17Humidi-MiZer ® System Control Connections . . . . 22Low Ambient Control (Factory Option) . . . . . . . . . 37Staged Air Volume (SAV) with Variable FrequencyDrive (Factory Option) . . . . . . . . . . . . . . . . . . . . . . . 37EconoMi$er ® X — Ultra Low Leak Economizer(Factory Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37ComfortLink Controls (Factory Option) . . . . . . . . . 37PremierLink™ Controller (Factory Option) . . . . . . 41Supply Air Temperature (SAT) Sensor . . . . . . . . . . 44Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 47RTU Open Controller System . . . . . . . . . . . . . . . . . . . 50Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Communication Wiring — Protocols . . . . . . . . . . . . 57Local Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . . . 59Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60Step 12 — Adjust Factory-Installed Options . . . . . 61Step 13 — Install Accessories. . . . . . . . . . . . . . . . . . . 61Step 14 — Check Belt Tension . . . . . . . . . . . . . . . . . . 61Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . 62START-UP CHECKLIST . . . . . . . . . . . . . . . . . CL-1, CL-2SAFETY CONSIDERATIONSImproper installation, adjustment, alteration, service, main-tenance, or use can cause explosion, fire, electrical shock orother conditions which may cause personal injury or propertydamage. Consult a qualified installer, service agency, or yourdistributor or branch for information or assistance. The quali-fied installer or agency must use factory-authorized kits or ac-cessories when modifying this product. Refer to the individualinstructions packaged with the kits or accessories wheninstalling.Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloths for brazing operations and have afire extinguisher available. Read these instructions thoroughlyand follow all warnings or cautions attached to the unit. Con-sult local building codes and appropriate national electricalcodes (in USA, ANSI/NFPA 70, 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 per-sonal injury.Understand the signal words DANGER, WARNING, CAU-TION, and NOTE. These words are used with the safety-alertsymbol. DANGER identifies the most serious hazards whichwill result in severe personal injury or death. WARNING signi-fies hazards which could result in personal injury or death.CAUTION is used to identify unsafe practices, which may re-sult in minor personal injury or product and property damage.NOTE is used to highlight suggestions which will result in en-hanced installation, reliability, or operation.48HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speedindoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of2018.48HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoorfan control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiencystandard of 2018.For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the VariableFrequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, andTroubleshooting manual.WARNINGFIRE, EXPLOSION HAZARDFailure to follow this warning could result in personalinjury or death.Disconnect gas piping from unit when leak testing at pres-sure greater than 0.5 psig (3450 Pa). Pressures greater than0.5 psig (3450 Pa) will cause gas valve damage resulting inhazardous condition. If gas valve is subjected to pressuregreater than 0.5 psig (3450 Pa), it must be replaced beforeuse. When pressure testing field-supplied gas piping atpressures of 0.5 psig (3450 Pa) or less, a unit connected tosuch piping must be isolated by closing the manual gasvalve.WeatherMaster ®48HC07-12Single Package Rooftop Gas Heat/Electric Cooling Unitwith Puron ® (R-410A) Refrigerant