Carrier Outdoor Temperature Sensor and Supply Air Temperature Sensor Information
Page 25

ECONOMISERIV STANDARD SENSORS

Outdoor Air Temperature (OAT) Sensor -- The outdoor air

temperature sensor (HH57AC074) is a 10 to 20 mA device used to measure the outdoor-air temperature. The outdoor-air temperature is used to determine when the EconoMiSerIV can be used for free cooling. The sensor must be field-relocated. See Fig. 32. The operating range of temperature measurement is 40 to 100E

Supply Air Temperature (SAT) Sensor -- The supply air temperature sensor is a 3 K tl_ermistor located at the inlet of the indoor fan. See Fig. 33. This sensor is factory inst_flled. The op- erating range of temperature measurement is 0 ° to 158 E See

Table 11 for sensor temperature/resistance values.

The temperature sensor looks like an eyelet terminal with wires running to it. The sensor is located in the "crimp end" and is settled from moisture.

Low Temperature Compressor Lockout Switch -- The EconoMiSerIV is equipped with an ambient temperature lock- out switch located in the outdoor airstrealn which is used to

lockout the compressols below a 42 F ambient temperature. See Fig. 32.

Table 11 -- Supply Air Sensor Temperature/

Resistance Values

TEMPERATURE

(F)

RESISTANCE (ohms)

-58

 

200,250

-40

 

100,680

-22

 

53,010

-4

 

29,091

14

 

15,590

32

 

9,795

50

 

5,970

68

 

3,747

77

 

3,000

86

 

2,416

104

 

1,597

122

 

1,080

140

 

745

158

 

525

176

 

376

185

 

321

194

 

274

212

 

203

230

 

153

248

 

115

257

 

102

266

 

89

284

 

70

302

 

55

ECONOMI$ERIV

CONTROL

MODES

a controllel: The EconoMiSer2 is operated by a 4 to 20 mA

signal from an existing field-supplied controller (such as IMPORTANT: The option_d EconoMi$er2 does not include PrelnierLink TM control). See Fig. 36 for wiring information.

Determine the EconoMiSerlV control mode befole set up of the control. Some modes of operation may lequire diffelent sen-

sors. Refer to Table 12. The EconoMi$erlV is supplied from the factory with a supply air temperature sensor, a low temperature

complessor lockout switch, and an outdoor air temperature

sensol: This allows for operation of the EconoMi$erIV with outdoor air diy bulb changeover control. Additional accesso- ries can be added to _dlow for different types of changeover control and operation of the EconoMiSerlV and unit.

Table 12 --EconoMi$erlV Sensor Usage

 

 

ECONOMISERIV

WITH OUTDOOR AIR

APPLICATION

DRY

BULB

SENSOR

 

 

Accessories

Required

Outdoor Air

None. The

outdoor

air dry bulb sensor

Dry Bulb

is

factory

installed.

Differential Dry Bulb

CRTEMPSN002A00*

Single

Enthalpy

 

HH57AC078

 

 

 

HH57AC078

Differential

Enthalpy

 

 

and

 

 

CRENTDIF004A00*

CO2 for DCV Control

 

33ZCSENCO2

using a Wall-Mounted

 

CO2 Sensor

 

 

 

 

CO2 for DCV Control

 

 

 

 

using a Duct-Mounted

and

 

 

CRCBDiOX005A00tt

CO2 Sensor

33ZCSENCO2t

 

 

 

33ZCASPCO2**

 

 

 

*CRENTDiF004A00 and CRTEMPSN002A00 accessories are used on

many different base units. As such, these kits may contain parts that will not be needed for installation.

1-33ZCSENCO2 is an accessory CO2 sensor.

**33ZCASPCO2 is an accessory aspirator box required for duct- mounted applications.

1-1-CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2

and 33ZCASPCO2 accessories.

Outdoor DLy Bulb Changeover -- The standard controller is

shipped from the factory configured for outdoor &y bulb changeover control. The outdoor air and supply air temperature sensors me included as standard. For this control mode, the outdoor temperature is compmed to an adjustable set point se- lected on the control. If the outdoor-air temperature is above

the set point, the EconoMiSerIV will adjust the outdoor-air dampers to minimum position. If the outdoor-air temperature is below the set point, the position of the outdoor-air dampers will be controlled to provide free cooling using outdoor ail: When in this mode, the LED next to the free cooling set point potenti-

ometer will be on. The changeover temperature set point is controlled by the free cooling set point potentiometer located on the control. See Fig. 37. The sc_fle on the potentiometer is A,

B, C, and D. See Fig. 38 for the corresponding temperature changeover values.

Differential Dry Bulb Control -- For differential dry bulb control the standard outdoor @ bulb sensor is used in conjunc- tion with an additional accessory return air sensor (part number

CRTEMPSN002A00). The accessory sensor must be mounted in the return airstream. See Fig. 39.

In this mode of operation, the outdoor-air temperature is compared to the return-air temperature and the lower tempera- ture airstream is used for cooling. When using this mode of

changeover control, turn the free cooling/enthalpy set point potentiometer fully clockwise to the D setting. See Fig. 37.

EXHAUST

FAN SET POINT

LED LIGHTS

WHEN EXHAUST

CONTACT IS MADE

MINIMUM DAMPER

POSITION SETTING

MAXIMUM DAMPER

DEMAND CONTROL

VENTILATION SET POINT

LED LIGHTS WHEN

DEMAND CONTROL

VENTILATION iNPUT

IS ABOVE SET POINT

DEMAND CONTROL

VENTILATION SET POINT

LED LIGHTS WHEN

OUTDOOR AIR IS

SUITABLE FOR

FREE COOLING

FREE COOLING / ENTHALPY

CHANGEOVER SET POINT

Fig. 37 -- EconoMi$erlV Controller Potentiometer

and LED Locations

25

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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 DataFreeze Protection Thermostat F Unit 48TJ Furnace SectionOUTDOOR-AIR Inlet Screens Make Unit Duct Connections -- Unit Install Flue Hood and Wind BaffleTrap Condensate Drain -- See Fig InsideOrifice Quantity Orifice Change -- This unit is factory asLP Gas Conversion GAS VO Ltag ETBI 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$ERIV11t,4 AOlI so+Nocv EconoMi$erlV Controller 002 Sensor Maximum Range SettingSR117 To x l---ff+ TR 002 Sensor Standard Settings Llsv MOISTUREMI$ERLPS TranCrankcase Heater Size 028 and Units with Compressor RotationFan Performance --48TJD020 and 024 Low Heat Units Fan Performance --48TJD016 Low Heat UnitsAirflow Fan Performance --48TJF016 High Heat Units Fan Performance 48TJD028 Low Heat UnitsFan Performance --48TJF028 High Heat Units Fan Performance 48TJF020 and 024 High Heat UnitsAccessory/FlOP Static Pressure In. wg --48TJ020-028 Accessory/FlOP Static PressureFan Rpm at Motor Pulley Settings Air Quantity LimitsEvaporator-Fan Motor Efficiency Evaporator-Fan Motor DataOperating Sequence COOLING, Units with ECONOMISER2, Premier COOLING. Units with ECONOMISER2, PremierHEATING. Unit with ECONOMI$ER2, Premierlink OAT SPTTypical Gas Heating Section Coil Maintenance and Cleaning 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.

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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.

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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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