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From inside (document excerpt):
25HNA Infinityt Series Heat Pumps with Puronr Sizes 24 to 60 2 To 5 Nominal Tons Installation Instructions TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS . 2 INSTALLATION RECOMMENDATIONS . 2 INSTALLATION 3 – 13 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 – 4 Step 6 – Install TXV 4 Step 7 – Install Liquid Line Solenoid Valve (LSV) .
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5 Step 8 – Make Piping Connections 5 – 7 Step 9 – Make Electrical Connections 7 – 8 Step 10 – Compressor Crankcase Heater . 8 Step 11 – Install Accessories 8 Step 12 – Make Airflow Selections 8 Step 13 – Start-Up 9 A05240 Fig. 1 25HNA6 / 25HNA9 Step 14 – System Functions and Sequence of Operation . 9 – 12 Step 15 – Check Charge . 12 – 13 MAJOR COMPONENTS 14 TROUBLESHOOTING 14 – 17 FINAL CHECKS . 19 CARE AND MAINTENANCE 19 PURON REFRIGERANT QUICK REFERENCE GUIDE 19 NOTE: Read the entire instruction manual before starting the installation. Unless otherwise noted, information in these installation instructions pertain to both 25HNA6 and 25HNA9 series units. Information that is unique to the 25HNA6 series will be identified as such; likewise information that is unique to the 25HNA9 series will also be identified. 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.