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Hersteller: Carrier Dateigröße: 2.05 mb Dateiname: 48nt-20si.pdf Unterrichtssprache:

1 . 1 . 1 1-10 . 1 RECEIVING AND INSTALLATION......... Step 1 — Check Equipment ............. • IDENTIFY MACHINE • INSPECT SHIPMENT Step 2 — Provide Unit Support..............4 • ROOF CURB • SLAB MOUNT Step 3 — Provide Clearances ................4 Step 4 — Rig and Place Unit.................4 Step 5 — Connect Condensate Drain.........5 Step 6 - Install Venting ....................6 Step 7 - Install Gas Piping..................6 Step 8 — Install Duct Connections...........7 Step 9 - Install Electrical Connections.......8 • HIGH VOLTAGE CONNECTIONS • SPECIAL PROCEDURES FOR 208-V OPERATION • CONTROL VOLTAGE CONNECTIONS • HEAT ANTICIPATOR SETTING • TRANSFORMER CIRCUIT PROTECTION PRE-START-UP START-UP..... MAINTENANCE 10,11 11-20 20-26 NOTE TO INSTALLER — Before the installation, READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY. Also, make sure the User’s Manual and Replacement Guide are left with the unit after installation. SAFETY CONSIDERATIONS Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified personnel should install, repair or service air conditioning equipment. Untrained personnel can perform basic maintenance functions of cleaning coils and filters. All other operations should be performed by trained service personnel. When working on air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations. A WARNING Improper installation, adjustment, alteration, service, maintenance or use can cause carbon monoxide poisoning, fire or an explosion which can result in personal injury or unit damage. Consult a qualified installer, service agency or gas supplier for information or assistance. The qualified installer or agency must use only factory-authorized kits or accessories when modifying this product._ Fig. 1 - Model 48NLT, NMT, NET, NHT and NVT A WARNING Before performing service or maintenance operations on unit, turn off unit main power switch. Electrical shock could cause personal injury. General - The 48NLT, NMT, NET, NHT and NVT units are fully self-contained, combination gas heating/ cooling units designed for outdoor installation. See Fig. 1. The units are shipped in a vertical configuration and may be installed either on a rooftop or converted to horizontal configuration when placed on a ground-level cement slab. Job Data — Necessary information consists of: machine location drawings, piping drawings, field wiring diagrams and rigging guide. RECEIVING AND INSTALLATION Step 1 — Check Equipment IDENTIFY MACHINE — The machine model number and serial number are stamped on machine identification plate. Check this information against shipping papers and job data. INSPECT SHIPMENT — Inspect for shipping damage while machine is still on shipping pallet. If machine appears to be damaged or is torn loose from its anchorage, have it examined by transportation inspectors before removal. Forward claim papers directly to transportation company. Manufacturer is not responsible for any damage incurred in transit. Check all items against shipping list. Immediately notify the nearest Carrier Air Conditioning office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book|1 |4 PC 111 Catalog No 564-920 Printed in U.S.A. Form 48NT-20SI Pg 1 11-91 Replaces: 48NT-19SI I II © UNIT ELECTRICAL CHARACTERISTICS UNIT WT CORNER WT LB/KG LB KG A B C O 48NLT018 208/230/1/60 450 204 99/45 126/57 126/57 99/45 48NLT024 208/230/1/60 454 206 100/45 127/58 127/58 100/45 48NHT024 208/230 1/60 460 210 101/46 129/59 129/59 101/46 48NLT030 208/230/1/60 470 214 103/47 132/60 132/60 103/47 48NMT030 208/230/1/60 476 216 105/48 133/60 133/60 105/48 48NHT030 208/230/1/60 480 218 106/48 134/61 134/61 106/48 48NLT036 208/230/1/60, 208/230/3/60, 460/3/60 486 222 107/49 136/62 136/62 107/49 48NMT036 208/230/1/60, 208/230/3/60, 460/3/60 490 222 108/49 137/62 137/62 108/49 48NET036 208/230/1/60, 208/230/3/60, 460/3/60 490 222 108/49 137/62 137/62 108/49 48NLT042 208/230/1/60, 208/230/3/60, 460/3/60 496 224 109/49 139/63 139/63 109/49 48NMT042 208/230/1/60, 208/230/3/60, 460/3/60 500 228 110/50 140/64 140/64 110/50 48NET042 208/230/1/60, 208/230/3/60, 460/3/60 500 228 110/50 140/64 140/64 110/50 - RETURN AIR OPENIN8 ■2 3/16' 55.6 NOTE: Clearances must be maintained to prevent recirculation of air from condenser-fan discharge. REQUIRED CLEARANCES TO COMBUSTIBLE MATERIAL - in. (mm) Maximum Extension of Overhang........ 48(1219.2) Unit To...

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