Carrier 48N User Manual

HEATING A COOLING48NPackaged Heating/Cooling UnitsInstallation InstructionsNOTE TO INSTALLER: Leave these instructions, the User’s Manual, and

A. Prestartup ProceduresProceed as follows to inspect eind prepare the unit for initial startup:1. Remove all access panels.2. Read and follow inst

codes, or contact your Distributor or Branch to determine the required orifice size.C. Adjusting Gas InputThe gas input to the unit is

Table 9 shows the approved temperature rise range for each unit, and the air delivery Cfm at various temperature rises. The heating operation airfl

PILOT FLAME BURNER FLAMEblower motor. Check blower wheel for correct rotation as indicated by arrow on blower housing. If blower wheel

A CAUTIONDo not change the blower-motor lead connections on 460-V units from the factory setting. Damage to unit may result.The heating

Table 9—Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating InputNominal SizeHeating Input (Btuh) 2530 35 4045 505560 65 7075 8048NLT01

Table 12—Model 48N Air Delivery (Cfm) at Indicated External Static Pressure & Voitage (Sizes 48NLT018 thru 48NHT048) End DischargeExternal Static

Table 14—Model 48NT060 (Belt Drive) Air Delivery (Cfm) At Indicated External Static Pressure (in. W.C.) (Dry Coil without Air Filter*)End DischargeEXT

Clean and lubricate the blower motor and wheel for direct drive models as follows:1. Remove and disassemble blower assembly as follows:a. R

(3.) Work cable in and out of cell three or four times to obtain sufficient cleaning. Do not pull cable with great force. Reverse drill an

IGEFFICIENCYRATINGCERTIFIEDamaUnit WeightsIV)oa2--nZ N)(/) oN (D (AC 1^00ZSHo uIV)S m ^ z S w2 >D30>zoShipping Wt. Operating Wt.Corner Wt. lbs.U

))A88078Fig. 12—Wiring Schematic—1 Phase-230V (Typical)20

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occurred, check each electrical component with the proper electrical instrumentation. Refer to the unit wiring label when making these c

Table 18—Heating Sen/ice Analysis ChartSYMPTOMCAUSEREMEDYPilot will not light.No spark at electrodeCheck air gap between electrode tip and pilot targe

FLARE NUT STRAINER RETAINER COOLINGTOINDOORCOILFLARENUT(TOWARD INDOOR COIL) Fig. 15—Metering Device ComponentsTable 19—Cooling Service Analysis ChartS

GEFFICIENCYRATINGCERTIFIEDamaUnit Weights000Q.— -n2 w1 I(/) o n‘ 9 <D S» m5 £2o > S r-05o=r 3J= Iz ^ T oOPTIONAL SUPPLY- AIR OPENING-OPTIONA

This publication contains the following:Step 1. Moving and Setting Unit in Place Condensate Disposal Venting Gas Piping Duct Connections Electrical Co

Table 1—Maximum Gas Flow Capacity of Pipe in Cubic Feet of Gas Per Hour for Gas Pressures of 0.5 PSIG or Less and a Pressure Drop of 0.5 inch Water Co

A73130A CAUTIONUnstable operation may occur when the gas valve and manifold assembly are forced out of position while connecting improperly

Table 2—Specifications—Models 48N (Sizes NLT018300 thru NLT036600)MODEL 48N48N 48N48N 48N48N48N 48N48NSIZELT018300 LT024300HT024300 LT030300 MT030300H

Table 5—Specifications—Models 48N (Sizes VT042300 thru MT048600)MODEL 48N 48N 48N 48N48N48N48N48N 48NSIZE VT042300VT042500 VT042600 LT048300LT048500LT

4. Insulate low-voltage wires for highest voltage contained within conduit when low-voltage control wires are run in same conduit as hig