Carrier 48TJ016-028 Evaporator Fan Service and Replacement, Motor Section, With Belt

Page 41

Evaporator Fan Service and Replacement

48TJ016 UNITS (See Fig. 51 )

NOTE: To lemove belts only. follow Steps 1-6.

1.Remove filter and supply-air section panels.

2.Remove unit top panel.

3.Loosen carriage nuts A and B holding motor mount assembly to fan scroll side plates.

4.Loosen screw C.

5.Rotate motor mount assembly (with motor attached) as far as possible away from evaporator coil.

6.Remove belt.

7.Rotate motor mount assembly back past original position toward evaporator coil.

8.Remove motor mounting nuts D and E (both sides).

9.Lift motor up through top of unit.

10.Reverse above procedure to leinstall motol:

11.Check and adjust belt tension as necessary.

48TJ020-028 UNITS (See Fig. 52) -- The 48TJ020-028 units use a fan motor mounting system that features a slide-out motor mounting plate. To replace or service the motor, slide out the bracket.

1.Remove the evaporator-fan access panel and the heat- ing control access panel.

2.Remove the center post (located between the evaporator

fan and heating control access panels) and all screws securing it.

3.Loosen nuts on the 2 carriage bolts in the motor mounting base.

4.Using jacking bolt under motor base, raise motor to top of slide and remove belt. Secure motor in this position by tightening the nuts on the cturiage bolts.

5.Remove the belt drive.

6.Remove jacking bolt and tapped jacking bolt plate.

7.Remove the 2 screws that secure the motor mounting plate to the motor support channel.

8.Remove the 3 screws from the end of the motor support channel that interfere with the motor slide path.

SECOND BELT

ON 10 HP MOTOR

ONLY

STRAIGHTEDGE MUST

PARALLEL

WITH BELT

ENSURE PROPER

PULLEY

CLEARANCE

BETWEEN

 

BELT(_ AND

FAN

 

.SUPPORT NOTCH

MOVABLE

FLANGES

PULLEY

MOTOR AND FAN

\SHAFTS MUST BE

PARALLELSETSCREWS

FIXED FLANGE

SINGLE-GROOVE

Fig. 50 --Evaporator-Fan Pulley and Adjustment

j,

MOTOR

UNIT TOP PANEL

PULLEY

D A

 

 

MOTOR

 

 

FAN

PULLEY

FAN SCROLL

SIDE PLATES

DRAIN

CONNECTION

Fig. 51 --48TJ016 Evaporator-Fan

Motor Adjustment

FAN PULLEY_

BELT,

MOTOR PULLEY

SLIDING MOTOR

PLATE

MOTOR

PLATE

\

 

-JACKING PLATE

MOTOR

SUPPORT

CHANNEL

JACKING BOLT

NOTE: A 31/2-in. bolt and threaded plate are included in the installer's packet. They should be added to the motor support chan- nel below the motor mounting plate to aid in raising the motor. The

plate part number is 50DP503842. The adjustment bolt is 3/8-16 x 13/4 in. LG.

Fig. 52 --48TJ020-028 Evaporator-Fan

Motor Section

41

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Contents Installation, Start-Up Service Instructions Rig and Place Unit --Do not diop unit Accessory Curb14-3/4 Package no HeightOUTLINEGPUN,T Spreaderbars Detail a DimensionsUnit Base Rail UnitSTD Unit Economizer DIM B DIM C Unit WeightDIM a DIM B DIM C Weight BTD Unit Unit WeightEvaporator FAN Physical DataOUTDOOR-AIR Inlet Screens Unit 48TJ Furnace SectionFreeze Protection Thermostat F Make Unit Duct Connections -- Unit Install Flue Hood and Wind BaffleTrap Condensate Drain -- See Fig InsideLP Gas Conversion Orifice Change -- This unit is factory asOrifice Quantity TBI VO Ltag EGAS Thermostat Assembly Field Control Thermostat WiringElectrical Data Securing Screws Make Outdoor-Air Inlet Adjust- mentsPanel PANMotormaster I Control Installation Install All Accessories-- Install allMotormaster V Control Package Usage Motormaster V Control InstallationItem Description 48TJ024,028Outputs AdjustFactory-Installed OptionsWnti ELDEcono Motor GrinyelOutdoor AIR Return Application Temperature Sensor Enthalpy33CSENTHSW Differential Enthalpy Control Wiring JIN Unit OutdoorOptional Economiseriv and ECONOMISER2 EconoMiSerlVComponent Locations-- End ViewEconoMi$erlV Wiring EconoMi$erlV Sensor Usage Supply Air Sensor Temperature Resistance ValuesEconomiseriv Standard Sensors ECONOMI$ERIV11t,4 SR117 EconoMi$erlV Controller 002 Sensor Maximum Range SettingAOlI so+Nocv To x l---ff+ TR 002 Sensor Standard Settings Llsv MOISTUREMI$ERLPS TranCrankcase Heater Size 028 and Units with Compressor RotationAirflow Fan Performance --48TJD016 Low Heat UnitsFan Performance --48TJD020 and 024 Low Heat Units Fan Performance --48TJF016 High Heat Units Fan Performance 48TJD028 Low Heat UnitsFan Performance --48TJF028 High Heat Units Fan Performance 48TJF020 and 024 High Heat UnitsAccessory/FlOP Static Pressure In. wg --48TJ020-028 Accessory/FlOP Static PressureFan Rpm at Motor Pulley Settings Air Quantity LimitsOperating Sequence Evaporator-Fan Motor DataEvaporator-Fan Motor Efficiency COOLING, Units with ECONOMISER2, Premier COOLING. Units with ECONOMISER2, Premier HEATING. Unit with ECONOMI$ER2, Premierlink OAT SPTTypical Gas Heating Section Coil Maintenance and Cleaning RecommenLubrication Evaporator Fan Performance AdjustmentCondenser and EVAPORATOR-FAN Motor Manufacturer LubricantMotor Section Evaporator Fan Service and ReplacementFixed Flange SINGLE-GROOVE With BeltCondenser-Fan Adjustment Belt Tension Adjustment --To adjust belt tensionDiagnostic IGC Control LEDs-- The IGC bomd Gas Valve AdjustmentProtective Devices Control Circuit, 24-7--This control circuit is proSee 48TJD016D o,,-PL1o-12 1Oll IOll 1011BKR W/AT AHAUnit Troubleshooting- Refer to Tables 27-29 Cause Remedy Cooling Service AnalysisWill Not Than NormallySubcooler Service Analysis Heating Service AnalysisProblem Cause MoistureMi$er TM DehumidificationEr LOC.rsOFF Valve Motor FaultInputs EconoMi$erlV Input/Output LogicDCV OutputsIndex Service Training Page Model no Serial no Date RETURN-AIR TemperatureSupply 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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