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From inside (document excerpt):
25HPA Performancet Series Heat Pump with Puronr Refrigerant Sizes 18 to 60 1–1/2 to 5 Nominal Tons Installation Instructions TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS . 2 INSTALLATION RECOMMENDATIONS . 2 INSTALLATION . 3 – 10, 17 Step 1 – Check Equipment & Jobsite . 3 Step 2 – Install on Solid Pad 3 Step 3 – Clearance Requirements 3 Step 4 – Operating Ambient 3 Step 5 – Elevate Unit . 3 Step 6 – Install TXV .
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3 – 4 Step 7 – Make Piping Connections 5 – 7 Step 8 – Make Electrical Connections 7 – 8 Step 9 – Compressor Crankcase Heater . 8 Step 10 – Install Electrical Accessories 8 Step 11 – Check Defrost Thermistor and OAT Thermistor Attachments . 8 Step 12 – Start-Up 9 Step 13 – Check Charge 10, 17 GENERAL SEQUENCE OF OPERATION . 11 Fig. 1 25HPA A05341 HP SYSTEM FUNCTIONS AND SEQUENCE OF OPERATION 11 – 14 TROUBLESHOOTING 15 – 16 FINAL CHECKS . 18 CARE AND MAINTENANCE 18 PURONR REFRIGERANT QUICK REF. GUIDE . 18 SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing. Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes and National Electrical Code (NEC) for special requirements. Recognize safety information. This is the safety-alert symbol !. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage.