Carrier SINGLE PACKAGE ROOFTOP 48HC Installation Instructions Manual

Also see for 48TC*D: Service and maintenance instructions Installation instructions

2Field Connections 39. . . . . . . . . . . . . . . . . . . . . . . . . .Space Temperature (SPT) Sensors 40. . . . . . . . . . . .Indoor Air Quality (CO2 ) Sensor 40. . . . . . . . . . . . .Outdoor Air Quality Sensor 41. . . . . . . . . . . . . . . . .Space Relative Humidity Sensor or Humidistat 41. .Smoke Detector/Fire Shutdown (FSD) 42. . . . . . . . .Connecting Discrete Inputs 42. . . . . . . . . . . . . . . . . .Communication Wiring -- Protocols 43. . . . . . . . . . . .General 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Local Access 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .RTU Open Troubleshooting 44. . . . . . . . . . . . . . . . .Outdoor Air Enthalpy Control 45. . . . . . . . . . . . . . . . .Differential Enthalpy Control 45. . . . . . . . . . . . . . . .Smoke Detectors 46. . . . . . . . . . . . . . . . . . . . . . . . . . .Return Air Sensor Tube Installation 46. . . . . . . . . . .Smoke Detector Test Magnet 47. . . . . . . . . . . . . . . .Additional Application Data 47. . . . . . . . . . . . . . . . .Step 13 -- Adjust Factory--Installed Options 50. . . . . . . .Step 14 -- Install Accessories 50. . . . . . . . . . . . . . . . . . .SAFETY CONSIDERATIONSImproper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock or other conditions which may cause personal injuryor property damage. Consult a qualified installer, serviceagency, or your distributor or branch for information orassistance. The qualified installer or agency must usefactory--authorized kits or accessories when modifying thisproduct. Refer to the individual instructions packaged withthe kits or accessories when installing.Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloths for brazing operations andhave a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions attached tothe unit. Consult local building codes and appropriatenational electrical codes (in USA, 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 theunit and in instructions or manuals, be alert to thepotential for personal injury.Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with thesafety--alert symbol. DANGER identifies the most serioushazards which will result in severe personal injury ordeath. WARNING signifies hazards which could result inpersonal injury or death. CAUTION is used to identifyunsafe practices, which may result in minor personalinjury or product and property damage. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.FIRE, EXPLOSION HAZARDFailure to follow this warning could result in personalinjury or death.Disconnect gas piping from unit when leak testing atpressure greater than 0.5 psig (3450 Pa). Pressuresgreater than 0.5 psig (3450 Pa) will cause gas valvedamage resulting in hazardous condition. If gas valveis subjected to pressure greater than 0.5 psig (3450Pa), it must be replaced before use. When pressuretesting field--supplied gas piping at pressures of 0.5psig (3450 Pa) or less, a unit connected to such pipingmust be isolated by closing the manual gas valve.! WARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could cause personalinjury or death.Before performing service or maintenance operationson unit, always turn off main power switch to unit andinstall lock(s) and lockout tag(s). Unit may have morethan one power switch.! WARNINGUNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could cause personalinjury, death and/or equipment damage.Puronr (R--410A) refrigerant systems operate athigher pressures than standard R--22 systems. Do notuse R--22 service equipment or components on Puronrefrigerant equipment.! WARNINGPERSONAL INJURY AND ENVIRONMENTALHAZARDFailure to follow this warning could cause personalinjury or death.Relieve pressure and recover all refrigerant beforesystem repair or final unit disposal.Ware safety glasses and gloves when handlingrefrigerants. Keep torches and other ignition sourcesaway from refrigerants and oils.! WARNINGCUT HAZARDFailure to follow this caution may result in personalinjury.Sheet metal parts may have sharp edges or burrs. Usecare and wear appropriate protective clothing, safetyglasses and gloves when handling parts and servicingair conditioning equipment.CAUTION!48HC