Carrier 50JS instruction manual BÐWet Coil Air Delivery Unit 50JX 024-060 Deduct 10% for

Page 18

Table 4BÐWet Coil Air Delivery

Unit 50JX 024-060 (Deduct 10% for 208v)*

UNIT

MOTOR SPEED

 

 

 

EXTERNAL STATIC PRESSURE (IN. WG)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low

Watts

275

273

271

270

-

-

-

-

-

-

-

 

Cfm

923

844

754

669

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

024

Med

Watts

-

-

-

359

353

350

347

341

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

-

-

-

941

876

814

737

622

-

-

-

 

 

 

High

Watts

-

-

-

-

-

-

447

439

431

423

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

-

-

-

-

-

-

968

869

765

659

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low

Watts

276

276

272

-

-

-

-

-

-

-

-

 

Cfm

963

929

781

-

-

-

-

-

-

-

-

 

 

30

Med

Watts

375

377

371

362

354

350

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

1202

1170

1079

976

884

807

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High

Watts

-

-

-

-

469

449

435

428

-

-

-

 

Cfm

-

-

-

-

1174

988

828

718

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low

Watts

462

451

431

411

394

381

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

1374

1290

1205

1116

1020

916

-

-

-

-

-

 

 

36

Med

Watts

523

506

490

471

449

426

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

1500

1408

1301

1190

1082

977

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High

Watts

-

645

628

610

595

584

575

-

-

-

-

 

Cfm

-

1474

1369

1267

1169

1069

962

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low

Watts

620

600

586

574

562

548

530

510

487

462

439

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

1662

1621

1581

1540

1496

1447

1392

1331

1263

1186

1103

 

 

42

Med

Watts

-

-

-

-

686

661

634

606

577

547

517

Cfm

-

-

-

-

1722

1662

1594

1515

1427

1330

1227

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High

Watts

-

-

-

-

-

-

-

757

730

704

682

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

-

-

-

-

-

-

-

1669

1577

1486

1402

 

 

 

Low

Watts

620

600

586

574

562

548

530

-

487

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

1662

1621

1581

1540

1496

1447

1392

1331

1263

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

48

Med

Watts

763

747

729

709

686

661

634

606

577

547

517

Cfm

1917

1868

1822

1774

1722

1662

1594

1515

1427

1330

1227

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High

Watts

-

-

-

852

832

809

784

757

730

704

682

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

-

-

-

1982

1914

1839

1757

1669

1577

1486

1402

 

 

 

Low

Watts

597

592

578

526

460

452

445

-

-

-

-

 

Cfm

2265

2190

2101

2033

1974

1869

1614

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

Med

Watts

754

730

707

687

671

658

646

630

603

558

486

Cfm

2383

2282

2202

2134

2070

2005

1935

1858

1771

1667

1576

 

 

 

High

Watts

901

876

856

836

813

785

755

723

696

681

687

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cfm

2480

2383

2301

2233

2175

2122

2066

1998

1910

1788

1619

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Air delivery values are based on operating voltage of 230 v or 460 v, wet coil, without filter or electric heater. Deduct filter and electric heater pressure drops to obtain static pressure available for ducting.

NOTES:

1.Do not operate the unit at a cooling airflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may occur at airflows below this point.

2.Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended. 3. Deduct 10% for 208v.

The charging label and the tables shown refer to system tempera- tures and pressures in cooling mode only. A refrigerant charging label is attached to the outside of the service access door. If charge level is suspect in Heating mode, reclaim all refrigerant and charge to nameplate amount. (This information may be obtained from the physical data table also.)

IMPORTANT: When evaluating the refrigerant charge, an indi- cated adjustment to the specified factory charge must always be very minimal. If a substantial adjustment is indicated, an abnormal condition exists somewhere in the cooling system, such as insuf- ficient airflow across either coil or both coils.

REFRIGERANT CHARGE Ð The amount of refrigerant charge is listed on the unit nameplate and /or the physical data table. Refer to the Refrigeration Service Techniques Manual, Refrigerants Section.

NO CHARGE Ð Check for leak. Use standard evacuating tech- niques. After evacuating system, weigh in the specified amount of refrigerant (refer to system data plate).

LOW CHARGE COOLING Ð Use Cooling Charging Charts (Figs. 23-35). Vary refrigerant until the conditions of the chart are

met. Note that charging charts are different from type normally used. Charts are based on charging the units to correct superheat for the various operating conditions. Accurate pressure gage and temperature sensing devices are required. Connect the pressure gage to the service port on the suction line. Mount the temperature sensing device on the suction line and insulate it so that the outdoor ambient does not effect the reading. Indoor air CFM must be within the normal operating range of the unit.

TO USE COOLING CHARGING CHARTS Ð Take the outdoor ambient temperature and read the suction pressure gage. Refer to the chart to determine what the suction temperature should be. NOTE: If the problem causing the inaccurate readings is a refrigerant leak, refer to Check for Refrigerant Leaks section.

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Contents Troubleshooting Receiving and InstallationMaintenance Safety ConsiderationsUnit Weight Unit Height Center of Gravity Electrical Characteristics50JX042 IN. MM 50JS04850JS060 50JX048ÐCheck Equipment Receiving and InstallationÐGeneral Unit Size ODS Catalog NumberÐProvide Clearances InstallationÐProvide Unit Support ÐRig and Place UnitÐSelect and Install Ductwork Unit Maximum WeightÐProvide for Condensate Disposal AÐPhysical Data BÐPhysical DataC99030 ÐInstall Electrical ConnectionsC99061 C99013ÐWiring Schematics A00073A00074 TDR Time Delay Relay Thermostat Heating Tran Transformer A00075AÐElectrical DataÐ50JS RLA LRA FLAMocp → BÐElectrical DataÐ50JX Minimum Circuit Amps Mocp Maximum Overcurrent Protection Full Load AmpsLocked Rotor Amps Rated Load AmpsPRE-START-UP Special Procedures for 208-V OperationÐStart-Up Adjustments START-UPÐTypical Heat Pump Operation, Heating Mode Checking and Adjusting Refrigerant Charge AÐWet Coil Air Delivery Unit 50JS 018-060 Deduct 10% forUnit Motor Speed External Static Pressure IN. WG BÐWet Coil Air Delivery Unit 50JX 024-060 Deduct 10% for Indoor Airflow and Airflow Adjustments SpeedC00032 MaintenanceC00030 C00031C99035 C99031C99033 C99032AIR Filter Indoor Blower and MotorOutdoor FAN System Information C99097C99029 ÐCooling and Heating Troubleshooting Chart Symptom Cause RemedyCooling and Heating Troubleshooting Chart contd START-UP Checklist Remove and Store in JOB FilePage Page Book Tab 5a 5a Catalog No Form 50JS,JX-1SI Replaces 50JX-2SI

50JS specifications

The Carrier 50JS is a high-performance rooftop unit designed for commercial applications, combining advanced technology with energy efficiency to deliver optimal heating and cooling performance. Its compact design allows for easy installation, making it an ideal choice for various settings such as retail spaces, schools, and office buildings.

One of the standout features of the Carrier 50JS is its innovative energy efficiency. Equipped with a high-efficiency scroll compressor, it significantly reduces energy consumption while providing reliable climate control. This model boasts a commendable SEER (Seasonal Energy Efficiency Ratio) rating, which translates to lower utility bills and a reduced carbon footprint, meeting modern energy efficiency standards.

The 50JS unit utilizes R-410A refrigerant, an environmentally friendly option that contributes to its low global warming potential compared to traditional refrigerants. This aligns with Carrier's commitment to sustainability and reducing environmental impact.

Another significant characteristic of the 50JS is its advanced controls and intelligent building integration capabilities. The unit comes with a microprocessor-based control system that allows for precise temperature management and can be easily integrated into building automation systems. This feature enhances user experience, providing real-time data and better management of HVAC operations.

Noise reduction technology is also a key design focus of the Carrier 50JS. The unit incorporates sound-attenuating materials and features that minimize operational noise, making it suitable for noise-sensitive environments like offices and educational institutions.

In terms of air quality, the 50JS offers various filtration options, including high-efficiency filters that remove airborne particulates. This results in cleaner, healthier indoor air, which is crucial for occupant comfort and well-being.

Furthermore, the rooftop unit is built to withstand harsh weather conditions, featuring a durable cabinet constructed from galvanized steel with a corrosion-resistant finish. This enhances the unit's longevity and reliability over time.

In conclusion, the Carrier 50JS rooftop unit stands out in the commercial HVAC market due to its energy efficiency, advanced controls, quiet operation, and robust design. It represents a blend of state-of-the-art technology and practical features, making it a preferred choice for those looking to invest in reliable and sustainable climate control solutions.
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