Carrier 48TJ016-028 specifications Compressor Rotation, Crankcase Heater Size 028 and Units with

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CONDENSER COiL ,

l

DISCHARGE

 

 

 

 

OUTDOOR AiR

 

 

 

SUBCOOLER

/

 

 

COIL

 

SUCTION

 

EQUALIZER

 

 

F CCH

LINE

 

 

 

 

 

CRANKCASE

EVAPORATOR

 

 

HEATER

 

 

COIL

 

 

 

 

3-WAY

VALVE

S-LPS J

SUB COOLERCONTROL

LOW PRESSURESWITCH

TXV

INDOOR AIR

TXV -- Thermostatic Expansion Valve

Fig. 45 --MoistureMi$er TM Dehumidification Package Operation Diagram

START-UP

Use the following information and Start-Up Checklist on page CL-I to check out unit PRIOR to start-up.

Unit Preparation -- Check that unit has been installed in

accordance with these installation instructions and all applica- ble codes.

COMPRESSOR MOUNTING -- Do not loosen or remove complessor holddown bolts.

REFRIGERANT SERVICE PORTS -- Each reh'igerant sys- tem has a total of 3 Schrader-type service gage ports. One port is located on the suction line, one on the compressor discharge line, and one on the liquid line. In addition Schmder-type

valves are located underneath the low-pressme switches. Be sure that caps on the polls are tight.

COMPRESSOR ROTATION

48TJ016 and 020 Only -- The unit is equipped with a Phase Monitor Relay (PMR) board located in the control box. The PMR device will not allow the unit to run if field power is con- nected incorrectly. To determine if the Phase Monitor Relay is preventing the unit from starting, check to see if the red LED is blinking, ff the LED is blinking, the 3-phase field power has been wiled incorrectly. A solid light means that field power connections are correct.

48TJ024 and 028 Only -- It is important to be certain the compressors are rotaing in the proper direction. To determine whether or not compressoB are rotaing in the proper direction:

I. Connect service gages to suction and discharge pressure fittings.

2.Energize the compressoc

3.The suction pressure should &op and the discharge pres- sure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge pres- sure does not rise to normal levels:

1.Note that the evaporator fan is probably also rotating in the wrong direction.

2.Turn off power to the unit.

3.Reverse any two of the incoming power leads.

4.Turn on power to the unit.

5.Energize each compressoc

The suction and discharge pressure levels should now move to their normtd start-up levels.

NOTE: When compressors are rotating in the wrong direction, the unit will have increased noise levels and will not provide heating and cooling.

After a few minutes of reverse operation, the scroll com- pressor intermfl overload protection will open, which will acti- vate the unit's lockout and requires a manual reset. Reset is accomplished by turning the thermostat on and off.

INTERNAL WIRING -- Check all electrical connections in unit control boxes; tighten as required.

CRANKCASE HEATER (SIZE 028 AND UNITS WITH

MOISTUREMI$ER TM DEHUMIDIFICATION PACKAGE ONLY) -- Crankcase heater(s) is energized as long as there is power to the unit and the compressor is not operating.

IstartMPORTANT:-up. Otherwise,Unit &mmgepower musttothebecompressoronfor24 houBmay resultprior .to I

EVAPORATOR FAN- Fan belt and vmiable pulleys are

factory-installed. Remove tape from the fan pulley. See Tables 14-19 for fan performance data. Be sure that fans rotate in the proper direction. See Table 20 for air quantity limits. See

Tables 21-23 for static pressure information for accessories and options. See Table 24 for fan rpm tit motor pulley settings. See Tables 25 and 26 for evaporator-fan motor data and evaporator-

fan motor efficiency. To alter fan performance, see Evaporator Fan Perforlnance Adjustment section on page 40.

NOTE: A 31/2-in. bolt and threaded plate are included in the installer's packet for 48TJ020-028 units. They can be added to the motor support channel below the motor mounting plate to aid in raising the fan motor

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Contents Installation, Start-Up Service Instructions Package no Height Accessory CurbRig and Place Unit --Do not diop unit 14-3/4OUTLINEGPUN,T Unit DimensionsSpreaderbars Detail a Unit Base RailSTD Unit Economizer DIM B DIM C Unit WeightDIM a DIM B DIM C Weight BTD Unit Unit WeightEvaporator FAN Physical DataFreeze Protection Thermostat F Unit 48TJ Furnace SectionOUTDOOR-AIR Inlet Screens Inside Install Flue Hood and Wind BaffleMake Unit Duct Connections -- Unit Trap Condensate Drain -- See FigOrifice Quantity Orifice Change -- This unit is factory asLP Gas Conversion GAS VO Ltag ETBI Thermostat Assembly Field Control Thermostat WiringElectrical Data PAN Make Outdoor-Air Inlet Adjust- mentsSecuring Screws PanelMotormaster I Control Installation Install All Accessories-- Install all48TJ024,028 Motormaster V Control InstallationMotormaster V Control Package Usage Item DescriptionOutputs AdjustFactory-Installed OptionsGrinyel ELDWnti Econo MotorOutdoor AIR Return Application Temperature Sensor Enthalpy33CSENTHSW Differential Enthalpy Control Wiring JIN Unit OutdoorOptional Economiseriv and ECONOMISER2 EconoMiSerlVComponent Locations-- End ViewEconoMi$erlV Wiring ECONOMI$ERIV Supply Air Sensor Temperature Resistance ValuesEconoMi$erlV Sensor Usage Economiseriv Standard Sensors11t,4 AOlI so+Nocv EconoMi$erlV Controller 002 Sensor Maximum Range SettingSR117 To x l---ff+ TR 002 Sensor Standard Settings Tran MOISTUREMI$ERLlsv LPSCrankcase Heater Size 028 and Units with Compressor RotationFan Performance --48TJD020 and 024 Low Heat Units Fan Performance --48TJD016 Low Heat UnitsAirflow Fan Performance --48TJF016 High Heat Units Fan Performance 48TJD028 Low Heat UnitsFan Performance --48TJF028 High Heat Units Fan Performance 48TJF020 and 024 High Heat UnitsAir Quantity Limits Accessory/FlOP Static PressureAccessory/FlOP Static Pressure In. wg --48TJ020-028 Fan Rpm at Motor Pulley SettingsEvaporator-Fan Motor Efficiency Evaporator-Fan Motor DataOperating Sequence COOLING, Units with ECONOMISER2, Premier COOLING. Units with ECONOMISER2, PremierHEATING. Unit with ECONOMI$ER2, Premierlink OAT SPTTypical Gas Heating Section Coil Maintenance and Cleaning RecommenManufacturer Lubricant Evaporator Fan Performance AdjustmentLubrication Condenser and EVAPORATOR-FAN MotorWith Belt Evaporator Fan Service and ReplacementMotor Section Fixed Flange SINGLE-GROOVECondenser-Fan Adjustment Belt Tension Adjustment --To adjust belt tensionControl Circuit, 24-7--This control circuit is pro Gas Valve AdjustmentDiagnostic IGC Control LEDs-- The IGC bomd Protective DevicesSee 48TJD016D o,,-PL1o-12 1Oll IOll 1011BKR W/AT AHAUnit Troubleshooting- Refer to Tables 27-29 Than Normally Cooling Service AnalysisCause Remedy Will NotMoistureMi$er TM Dehumidification Heating Service AnalysisSubcooler Service Analysis Problem CauseEr LOC.rsOFF Valve Motor FaultOutputs EconoMi$erlV Input/Output LogicInputs DCVIndex Service Training Page Compressor Amps Supply FAN Amps Exhaust FAN Amps RETURN-AIR TemperatureModel no Serial no Date Supply Voltage

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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