Carrier 48NLT Installation, Start-up And Service Instructions Manual

Also see for 48NET: Installation, Start-Up and Service Instructions

48M.T, NMT, NET, NHT AND NVT 018-060Packaged Heating/Cooling UnitsHEATING & COOLINGInstallation, Start-Up and Service InstructionsCONTENTSPageSAFETY CONSIDERATIONS.1General .1Job Data .1RECEIVING AND INSTALLATION. 1-10Step 1 — Check Equipment .1• IDENTIFY MACHINE• INSPECT SHIPMENTStep 2 - Provide Unit Support.4• ROOF CURB• SLAB MOUNTStep 3 — Provide Clearances .4Step 4 - Rig and Place Unit.4Step 5 — Connect Condensate Drain.5Step 6 — Install Venting .6Step 7 - Install Gas Piping.6Step 8 - Install Duct Connections.7Step 9 — Install Electrical Connections.8• HIGH VOLTAGE CONNECTIONS• SPECIAL PROCEDURES FOR 208-VOPERATION• CONTROL VOLTAGE CONNECTIONS• HEAT ANTICIPATOR SETTING• TRANSFORMER CIRCUIT PROTECTIONPRE-START-UP .10,11START-UP.11-20MAINTENANCE.20-26NOTE TO INSTALLER — Before the installation, READTHESE INSTRUCTIONS CAREFULLY AND COM¬PLETELY. Also, make sure the User’s Manual and Re¬placement Guide are left with the unit after installation.SAFETY CONSIDERATIONSInstallation and servicing of air conditioning equipmentcan be hazardous due to system pressure and electrical com¬ponents. Only trained and qualified personnel should in¬stall, repair or service air conditioning equipment.Untrained personnel can perform basic maintenance func¬tions of cleaning coils and filters. All other operations shouldbe performed by trained service personnel. When workingon air conditioning equipment, observe precautions in theliterature, tags and labels attached to the unit and other safetyprecautions that may apply.Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloth for unbrazing operations. Havefire extinguisher available for all brazing operations.Fig. 1 - Model 48NLT, NMT, NET, NHT and NVTA WARNINGBefore performing service or maintenance operationson unit, turn off unit main power switch. Electrical shockcould cause personal injury.General - The 48NLT, NMT, net, NHT and NVTunits 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 maybe installed either on a rooftop or converted to horizontalconfiguration when placed on a ground-level cement slab.Job Data — Necessary information consists of:machine location drawings, piping drawings, field wiringdiagrams and rigging guide.RECEIVING AND INSTALLATIONStep 1 — Check EquipmentIDENTIFY MACHINE — The machine model number andserial number are stamped on machine identification plate.Check this information against shipping papers and job data.INSPECT SHIPMENT — Inspect for shipping damage whilemachine is still on shipping pallet. If machine appears to bedamaged or is torn loose from its anchorage, have it exam¬ined by transportation inspectors before removal. Forwardclaim papers directly to transportation company. Manufac¬turer is not responsible for any damage incurred in transit.Check all items against shipping list. Immediately notifythe nearest Carrier Air Conditioning office if any item ismissing.To prevent loss or damage, leave all parts in original pack¬ages until installation.Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.BookM 14 PC 111 Catalog No 564-920 Printed in U.S.A. Form 48NT-20SI Pg 1 11-91 Replaces: 48NT-19SITab |la|la