Carrier 50LJ User Manual

fHEATING & COOLING48LJ, 50LJ/LW024 Single-Package Cooling UnitsInstallation, Start-Up and ServiceInstructionsSAFETY CONSIDERATIONSInstallation and

UNIT SIZEWEIGHrABCDEFLbKgmmFt-ln.mmFt-inmm Ft-in. mm Ft-in.mm Ft-in mm Ft-in.50LJ0242565 1163.515565-1V416805-6V8 3141 10-3'Vi 65261-8"/i6 8

fUNIT SIZEWEIGHr\ BCDELbKgmmFt-inmm Ft-in.mm Ft-in.mm Ft-in.mmFt-in.50LW024 2775 1258 7 18035-112182 7-1% 6822-2%3909 12-9%5341-9*See note 10 NOTES:1.

Fig. 6 — Enthalpy SensorENTHALPY SENSORFig. 7 — Enthalpy Sensor Location CONNECTOR-ENTHALPY-MINIMUM POSITION (CLOCKWISE TO INCREASE)Fig. 9 — Setting &

fIMPORTANT: If unit is to be equipped with either barometric relief or power exhaust, the barometric relief/power exhaust hood must be in

BAROMETRIC RELIEF/POWER EXHAUST HOOD - The same hood is used for barometric relief and power exhaust, and is shipped separately from the

terminals on terminal blocks. See control wiring section on page 17.ROUTING THROUGH SIDE OF UNIT - When 200-amp or smaller disconnect is use

Table 3 - Electrical Data, 50LJ,LW024NOMINALV-PH-HZVOLTAGERANGECOMPR NO. 1COMPR NO. 2OFMIFMPOWER EXHAUST FAN MOTORELECTRICHEATPOWER SUPPLYMinMaxRLALRA

TBIEQUIP GNDEQUIP — Equipment GND — GroundLEGENDNEC — National Electrical Code TB — Terminal BlockFig. 13 — Field Power Wiring ConnectionsCONTROL WIR

COMPONENT ARRANGEMENT CONTROL BOX

"1ECONOMIZERMOTOR<n><S€1><S>€3(&>G> omm<D <±><l>OD№REDY^L B^U<3> OOO €9 t— econom:<r> &

CONTENTSPageSAFETY CONSIDERATIONS ... 1INSTALLATION ...2-21Rigging and Unit

LOW-VOLTAGE TERMINAL BLOCK IN UNIT CONTROL BOX (PI)THERMOSTAT/SUBBASEr-0&—J r~@---------------' f[wi]---------------1^-----------------------

i(fGas Piping — Unit is equipped for use with natural gas only. Installation must conform to local building codes, or in the absence of local cod

Approved oils:Witco Co...Suniso 3GSTexaco, Inc...

Economizer Dampers and Potentiometer Settings — With no power to the unit, the economizer outdoor- air dampers should be fully closed. Chec

cooling requirements.) If outdoor air alone will not meet the cooling requirements, Y2 on the thermostat will close, energizing Compressor no. 1 to wo

%NOTE: Disassembly of the top cover may be required under special service circumstances. It is very important that the orientation and position of th

VIEW A-A BURNER SECTIONFig. 22 - Gas Section Detaii, 48LJE (High Heat)Fig. 23 — Combustion Blower RemovalLEGENDFB — Fuse Block FU - FuseHC - Heater Co

BELT INSTALLATION AND TENSIONINGNOTE: When installing or replacing belts, always use a complete set of new, matched belts. Mixing belts

CENTER LINESPILOT LIGHT OFF — If pilots do not light as described in Heating section on page 23, be sure that pilot orifice is unobstructed,

ENTHALPY CONTROL, MAT, AND ECONOMIZER DAMPER VENT POSITION — See Installation section of this publication for adjustment procedures.AUXILIARY SWIT

f1 Rig with 4 cables and spread with two 95-in. (2413-mm) and 2 “A” long suitable spreader bars.2 Center of gravity and unit weight include economiz

6896213^52oin¡483UJccS 41 4 inccQ.2 345zo5276:din207111 M 1 1OUTDOOR TEMP F C 115 46105 41 95 35 85 2975 24 65 1855 13 45 7?"ina.2=y'>&

Fig. 32 — Location of Rollout Switch Capillary TubeElectric HeatOVERCURRENT — Heaters are protected by fuses in the power circuit, located in the he

PISymptom: Evaporator Fan Will Not Operate.1. Turn unit power off and disconnect plug PI from the control board.2. Install a jumper across Pin R and

8. To verify compressor lockout logic:a. Disconnect CLO sensor wires connected to CLOl at the control board. Check wires for continuity. If there is

a. Disconnect CLO sensor wires connected to CL02 at the control board. Check wires for continuity. If there is no continuity, replace the sensor.b.

LEGEND AND NOTES FOR FIG. 36 AND 37AFS—Airflow Switch1—APS—Air Pressure SwitchICP—C—Contactor, CompressorIDC—CB—Circuit BreakerIDM—CCB—Control Circuit

LOW-HEAT (48LJD)HIGH-HEAT (48LJE)Fig. 36 — Gas Heat Sections, Models 48LJD,LJE02436

SCHEMATICFig. 37 — Typical Wirini

liCopyright 1992 Carrier CorporationManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice an

Table 1a — Physical Data, 48LJ UnitsBASE UNIT 48LJD024E024NOMINAL CAPACITY (tons) lb2020OPERATING WEIGHT (lb)*28952975COMPRESSORS (2 each unit) Capaci

Table 1b — Physical Data, 50LJ/LW UnitsBASE UNIT 50LJ024 LW024NOMINAL CAPACITY (tons) 2020OPERATING WEIGHT (lb)*25652775COMPRESSORS (2 each unit) Capa

1. Roofcurb accessory 50DJ900401 is shipped disassembled.2. Dimensions in ( ) are in millimeters.3 Roofcurb: 16 gage steel.4. A 90 degree return d

1. Roofcurb accessory 50DJ900391 is shipped disassembled.2. Dimensions in ( ) are in millimeters.3 Roofcurb: 16 gage steel.4 A 90 degree return du

NOTE: To prevent the hazard of stagnant water build-up in the drain pan of the evaporator section, unit can only be pitched as shown. See Table 1 for

UNIT SIZEWEIGHT* AB C DE FGLbKgmmFt-in.mm Ft-in. mmFt-in.mmFt-in. mm Ft-in.mmFt-in. mmFt-in.48LJD024 2895 1313.01813 6-1%21827-1%682 2-2%390912-9% 534