Carrier 48GC04 Service And Maintenance Instructions

2APPENDIX A — MODEL NUMBERNOMENCLATURE. . . . . . . . . . . . . . . . . . . . . . . . . . 63APPENDIX B — PHYSICAL DATA. . . . . . . . . . . . . . . 64APPENDIX C — FAN PERFORMANCE . . . . . . . . . . . 67APPENDIX D — WIRING DIAGRAMS . . . . . . . . . . . . 92APPENDIX E — LOW AMBIENT CONTROL SENSORLOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipment can behazardous due to system pressure and electrical components.Only trained and qualified service personnel should install, re-pair, or service air-conditioning equipment. Untrained person-nel can perform the basic maintenance functions of replacingfilters. Trained service personnel should perform all other op-erations.When working on air-conditioning equipment, observe precau-tions in the literature, tags and labels attached to the unit, andother safety precautions that may apply. Follow all safetycodes. Wear safety glasses and work gloves. Use quenchingcloth for unbrazing operations. Have fire extinguishers avail-able for all brazing operations.Follow all safety codes. Wear safety glasses and work gloves.Use quenching cloth for brazing operations. Have fire extin-guisher available. Read these instructions thoroughly and fol-low all warnings or cautions attached to the unit. Consult localbuilding codes and National Electrical Code (NEC) for specialrequirements.Recognize safety information. This is the safety ALERT sym-bol . When you see this symbol on the unit and in instruc-tions or manuals, be aware of the potential for physical injuryhazards.Understand the signal words DANGER, WARNING, andCAUTION. These words are used with the safety ALERTsymbol. DANGER indicates a hazardous situation which, ifnot avoided, will result in death or severe personal injury.WARNING indicates a hazardous situation which, if notavoided, could result in death or personal injury. CAUTIONindicates a hazardous situation which, if not avoided, could re-sult in minor to moderate injury or product and property dam-age. IMPORTANT is used to address practices not related tophysical injury. NOTE is used to highlight suggestions whichwill result in enhanced installation, reliability, or operation.WARNINGUNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could cause personal injury,death and/or equipment damage.Puron® (R-410A) refrigerant systems operate at higher pres-sures than standard R-22 systems. Do not use R-22 serviceequipment or components on Puron refrigerant equipment.WARNINGFIRE, EXPLOSION HAZARDFailure to follow this warning could result in death, seriouspersonal injury and/or property damage.Disconnect gas piping from unit when pressure testing atpressure greater than 0.5 psig (3450 Pa). Pressures greaterthan 0.5 psig will cause gas valve damage resulting in haz-ardous condition. If gas valve is subjected to pressure great-er than 0.5 psig, it must be replaced before use. When pres-sure testing field-supplied gas piping at pressures of0.5 psig or less, a unit connected to such piping must beisolated by closing the manual gas valve(s).WARNINGFIRE, EXPLOSION HAZARDFailure to follow this warning could result in death, seriouspersonal injury and/or property damage.Never use non-certified refrigerants in this product. Non-certified refrigerants could contain contaminates that couldlead to unsafe operating conditions. Use ONLY refrigerantsthat conform to AHRI Standard 700.CAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in reduced unitperformance or unit shutdown.High velocity water from a pressure washer, garden hose,or compressed air should never be used to clean a coil. Theforce of the water or air jet will bend the fin edges and in-crease airside pressure drop.WARNINGELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personal inju-ry or death.Units with convenience outlet circuits can use multiple dis-connects. Check convenience outlet for power status beforeopening unit for service. Locate the disconnect switch andlock it in the open position it. LOCKOUT/TAGOUT thisswitch to notify others.IMPORTANT: Lockout/tag-out is a term used when elec-trical power switches are physically locked preventingpower to the unit. A placard is placed on the power switchalerting service personnel that the power is disconnected.