Carrier 48TJ016-028 specifications Evaporator-Fan Motor Data, Evaporator-Fan Motor Efficiency

Page 36

Table 25 --Evaporator-Fan Motor Data

UNIT

UNIT

MAXIMUM

MAXIMUM

MAXIMUM

MAXIMUM

ACCEPTABLE

ACCEPTABLE

ACCEPTABLE

48TJ

VOLTAG E

AMP DRAW

CONTINUOUS BHP*

CONTINUOUS BkW*

OPERATING

WATTS

 

 

 

 

208/230

4.25

3.17

3,775

 

10.5

016

460

4.25

3.17

3,775

 

4.8

 

575

3.45

2.59

3,065

 

3.9

 

208/230

 

 

 

 

15.8

020

460

5.90

4.40

5,180

 

7.9

 

575

 

 

 

 

6.0

 

208/230

8.70

6.49

7,915

 

22.0

024

460

9.50

7.08

8,640

 

13.0

 

575

8.70

6.49

7,915

 

10.0

 

208/230

10.20

7.61

9,510

 

28.0

028

460

11.80

8.80

11,000

 

14.6

 

575

10.20

7.61

9,510

 

13.0

LEGEND

 

 

 

 

 

 

BHP -- Brake Horsepower

BkW -- Brake Kilowatts

*Extensive motor and electrical testing on these units ensures that the full horsepower (brake kilowatt) range of the motors can be utilized with confidence. Using your fan motors up to the horsepower (brake kilowatt) ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency requirements as established by the Energy Policy Act of 1992 (EPACT) effective October 24, 1997.

Table 26 --Evaporator-Fan Motor Efficiency

UNIT 48TJMOTOR EFFICIENCY (%)

016

(3.0

Hp)

81.7

016

(3.7

Hp)

65.6

020 (5 Hp)

67.5

024

(7.5

Hp)

66.5

028 (10 Hp)

69.5

NOTE: All indoor-fan motors 5 hp and larger meet the minimum effi- ciency requirements as established by the Energy Policy Act of 1992 (EPACT) effective October 24, 1997.

CONDENSER-FANS AND MOTORS -- Condenser fans and motol.'s am factol T set. Refer to Condenser-Fan Adjustment section (page 42) as required. Be sure that fans rotate in the proper direction.

RETURN-AIR FILTERS- Check that correct filtel.s are

installed in filter tracks (see Table 1). Do not operate unit with- out return-air filters.

OUTDOOR-AIR INLET SCREENS -- Outdoor-air inlet screens must be in place before operating unit.

GAS HEAT -- Verify gas pressmes before turning on heat as follows:

1.Turn off manual gas stop.

2.Connect pressure gage to supply gas pressure tap (see Fig. 13).

3.Connect pressure gage to manifold pressure tap on gas valve.

4.Turn on manual gas stop and set thermostat to HEAT position. Adjust set point to several degrees above the current room temperature to ensure a heat demand. After the unit has mn for sevend minutes, verify that incoming pressure is 5.5 in. wg or greater, and that the manifold

pressure is 3.3 in. wg. If manifold pressure must be ad- justed, refer to Gas Valve Adjustment section on page 43.

5.After unit has been in operation for 5 minutes, check tem- perature rise across the heat exchangers. See unit infor- mative plate for correct rise limits of the heat supplied.

Air quantities may need to be adjusted to bring the actual rise to within the zdlowable limits.

Operating Sequence

COOLING, UNITS WITHOLTT ECONOMIZER -- When thermostat calls for cooling, terminals G and Y I are energized. The indoor (evaporator) fan contactor (IF(?_), compressor con- tactor no. 1 (CI) and outdoor-fan contactor (OFC) are ener- gized, and evaporator-fan motor, compressor no. 1, and both condenser fans stall. The condenser-fan motors mn continuous-

ly while unit is cooling. If the thermostat calls for a second stage of cooling by energizing Y2, compressor contactor no. 2 (C2) is energized and compressor no. 2 starts.

When the thermostat is satisfied, CI and C2 tue deener- gized and the compressors and outdoor (condenser) fan motors

(OFM) shut off. After a 30-second delay, the indoor (evapora- tor) fan motor (IFM) shuts off. If the thermostat fan selector switch is in the ON position, the evaporator-fan motor will run continuously.

HEATING. UNITS WITHOUT ECONOMIZER -- When the thermostat calls for heating, terminal WI is energized. In order to prevent thermostat short-cycling, the unit is locked into the Heating mode for at least 1 minute when WI is ener- gized. The induced-draft motor (IDM) is then energized and the burner ignition sequence begins. The indoor (evaporator) fan motor (IFM) is energized 45 seconds after a fame is ignited. On units equipped for two stages of heat, when addi- tional heat is needed, W2 is enelgized and the high-fire sole-

noid on the main gas valve (MGV) is energized. When the thermostat is satisfied and WI and W2 are deenergized, the IFM stops after a 45-second time-off delay.

COOLING. UNITS WITH ECONOMISERIV -- When free cooling is not available, the compressol_ will be controlled by

the zone thermostat. When free cooling is available, the outdoor-air &unper is modulated by the EconoMiSerIV control to provide a 50 to 55 F supply-air temperature into the zone. As the supply-air temperature fluctuates above 55 or below 50 IF. the &lmpers will be modulated (open or close) to bring the supply-air temperature back within the set point limits.

For EconoMiSerIV operation, there must be a thermostat call for the fan (G). This will move the damper to its minimum position during the occupied mode.

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Contents Installation, Start-Up Service Instructions Accessory Curb Rig and Place Unit --Do not diop unit14-3/4 Package no HeightOUTLINEGPUN,T Dimensions Spreaderbars Detail aUnit Base Rail UnitDIM B DIM C Unit Weight STD Unit EconomizerBTD Unit Unit Weight DIM a DIM B DIM C WeightPhysical Data Evaporator FANUnit 48TJ Furnace Section Freeze Protection Thermostat FOUTDOOR-AIR Inlet Screens Install Flue Hood and Wind Baffle Make Unit Duct Connections -- UnitTrap Condensate Drain -- See Fig InsideOrifice Change -- This unit is factory as Orifice QuantityLP Gas Conversion VO Ltag E GASTBI Field Control Thermostat Wiring Thermostat AssemblyElectrical Data Make Outdoor-Air Inlet Adjust- ments Securing ScrewsPanel PANInstall All Accessories-- Install all Motormaster I Control InstallationMotormaster V Control Installation Motormaster V Control Package UsageItem Description 48TJ024,028AdjustFactory-Installed Options OutputsELD WntiEcono Motor GrinyelApplication Temperature Sensor Enthalpy Outdoor AIR Return33CSENTHSW Differential Enthalpy Control Wiring Outdoor JIN UnitEconoMiSerlVComponent Locations-- End View Optional Economiseriv and ECONOMISER2EconoMi$erlV Wiring Supply Air Sensor Temperature Resistance Values EconoMi$erlV Sensor UsageEconomiseriv Standard Sensors ECONOMI$ERIV11t,4 EconoMi$erlV Controller 002 Sensor Maximum Range Setting AOlI so+NocvSR117 To x l---ff+ TR 002 Sensor Standard Settings MOISTUREMI$ER LlsvLPS TranCompressor Rotation Crankcase Heater Size 028 and Units withFan Performance --48TJD016 Low Heat Units Fan Performance --48TJD020 and 024 Low Heat UnitsAirflow Fan Performance 48TJD028 Low Heat Units Fan Performance --48TJF016 High Heat UnitsFan Performance 48TJF020 and 024 High Heat Units Fan Performance --48TJF028 High Heat UnitsAccessory/FlOP Static Pressure Accessory/FlOP Static Pressure In. wg --48TJ020-028Fan Rpm at Motor Pulley Settings Air Quantity LimitsEvaporator-Fan Motor Data Evaporator-Fan Motor EfficiencyOperating Sequence COOLING. Units with ECONOMISER2, Premier COOLING, Units with ECONOMISER2, PremierOAT SPT HEATING. Unit with ECONOMI$ER2, PremierlinkCoil Maintenance and Cleaning Recommen Typical Gas Heating SectionEvaporator Fan Performance Adjustment LubricationCondenser and EVAPORATOR-FAN Motor Manufacturer LubricantEvaporator Fan Service and Replacement Motor SectionFixed Flange SINGLE-GROOVE With BeltBelt Tension Adjustment --To adjust belt tension Condenser-Fan AdjustmentGas Valve Adjustment Diagnostic IGC Control LEDs-- The IGC bomdProtective Devices Control Circuit, 24-7--This control circuit is pro48TJD016 SeeD o,,-PL1o-12 1011 1Oll IOllAHA BKR W/ATUnit Troubleshooting- Refer to Tables 27-29 Cooling Service Analysis Cause RemedyWill Not Than NormallyHeating Service Analysis Subcooler Service AnalysisProblem Cause MoistureMi$er TM DehumidificationMotor Fault Er LOC.rsOFF ValveEconoMi$erlV Input/Output Logic InputsDCV OutputsIndex Service Training Page RETURN-AIR Temperature Model no Serial no DateSupply Voltage Compressor Amps Supply FAN Amps Exhaust FAN Amps

48TJ016-028 specifications

The Carrier 48TJ016-028 is a notable model in the range of packaged rooftop units designed by Carrier, a leader in heating, ventilation, and air conditioning (HVAC) solutions. Tailored specifically for commercial applications, these units provide a blend of efficiency, durability, and reliability, making them suitable for a variety of settings, including offices, retail spaces, and industrial environments.

One of the standout features of the 48TJ series is its energy-efficient performance. Equipped with high-efficiency scroll compressors, these units offer superior cooling capacity while minimizing energy consumption. This aligns with modern sustainability goals, helping businesses reduce their carbon footprint and operational costs. Additionally, the 48TJ units comply with stringent industry standards, such as the ASHRAE 90.1 energy efficiency guidelines, ensuring that users receive a product that meets modern energy performance benchmarks.

The 48TJ016-028 units also include advanced technologies that enhance performance and user comfort. The inclusion of a sophisticated microprocessor control system facilitates precise temperature regulation, allowing for an optimal balance of cooling and heating based on real-time conditions. Moreover, the user-friendly controls make it easy for facility managers to monitor system performance and make adjustments as necessary.

Another notable characteristic of the 48TJ series is its flexible installation options. These rooftop units are designed for easy integration into existing building structures and can be installed on flat or pitched roofs. Their compact design and lightweight construction simplify the installation process while minimizing structural impacts on buildings.

Durability is paramount in the design of the 48TJ units as well. The cabinets are constructed from high-quality materials with corrosion-resistant coatings, ensuring a long lifespan even in harsh environmental conditions. The systems are also equipped with robust insulation to reduce sound levels and improve overall operating efficiency.

Furthermore, the Carrier 48TJ016-028 units offer various options for customization. Users can choose from different airflow configurations, heating options, and accessories, allowing for tailored solutions that meet specific requirements. Whether you are looking for a unit with enhanced filtration, economizer capabilities, or advanced humidity control, the 48TJ series provides the flexibility needed for diverse applications.

In summary, the Carrier 48TJ016-028 units deliver a compelling combination of energy efficiency, advanced technology, and robust construction, making them an ideal choice for commercial HVAC needs. With their versatile features and customizable options, they stand out as reliable solutions for maintaining comfortable indoor environments.
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