Enthalpy Sensor Jumper Settings -- There me two jumpers.

One julnper determines the mode of the enthalpy sensor. The other jumper is not used. To access the jumpers, relnove the 4 screws holding the cover on the enthalpy sensor and then re- move the covel: The factory settings for the jumpers are M3 and OFF.

The mode jumper should be set to M3 for 4 to 20 mA

output. The factory test jumper should remain on OFF or the enthalpy sensor will not calculate enth_dpy.

ENTHALPY SENSORS AND CONTROL -- The enthalpy

control (HH57AC077) is supplied as a field-installed accessory to be used with the EconoMiSer2 &unper control option. The outdoor air enthalpy sensor is part of the enthalpy control. The

separate field-installed accessory return air enthalpy sensor

(HH57AC078) is required for differential enthalpy control.

NOTE: The enthalpy control must be set to the "D" setting for differenti_d enthalpy control to work properly.

The enthalpy control receives the indoor and return enthalpy from the outdoor and return air enthalpy sensol_ and provides a dry contact switch input to the PremierLink TM controllel: Locate the controller in place of an existing econo- mizer controller or near the actuatol: The mounting plate may not be needed if existing bracket is used.

A closed contact indicates that outside air is preferred to the return air An open contact indicates that the economizer should remain at minilnuln position.

Outdoor Air Enthalpy Sensor/Enthalpy Controller

(HH57AC077) -- To wire the outdoor air enthalpy sensor, perform the following (see Fig. 30 and 31 ):

NOTE: The outdoor air sensor can be removed froln the back of the enth_dpy controller and mounted relnotely.

1.Use a 4-conductol, 18 or 20 AWG cable to connect the enthalpy control to the PremierLink controller and power tl_dnsformel:

2.Connect the following 4 wires fiom the wire h_uness located in rooftop unit to the enthalpy controller:

a.Connect the BRN wire to the 24 vac terminal (TRI) on enthalpy control and to pin 1 on 12-pin harness.

b.Connect the RED wire to the 24 vac GND terminal

(TR) on enthalpy sensor and to pin 4 on 12-pin harness.

c.Connect the GRAY/ORN wire to J4-2 on Premier-

Link controller and to terminal (3) on enthalpy sensor.

d.Connect the GRAY/RED wire to J4-1 on Premier- Link controller and to terminal (2) on enthalpy sensol:

NOTE: If installing in a Carrier rooftop, use the two gray wires provided fiom the control section to the economizer to connect PrelnierLink controller to terminals 2 and 3 on enth_dpy sensol:

Return Air Enthalpy Sensor -- Mount the return-air enthalpy

sensor (HH57AC078) in the return-air duct. The return air

sensor is wired to the enthalpy controller (HH57AC077). The outdoor enth_dpy changeover set point is set at the controller.

To wire the return air enthalpy sensol; perform the follow- ing (see Fig. 30):

1.Use a 2-conductor, 18 or 20 AWG, twisted pair cable to

connect the return air enthalpy sensor to the enthalpy controller.

2.At the enthalpy control remove the factory-installed resistor fi_m the (SR) and (+) terminals.

3.Connect the field-supplied RED wire to (+) spade connector on the return air enthalpy sensor and the (SR+) terminal on the enthalpy controllel: Connect the BLK

wire to (S) spade connector on the return air enthalpy sensor and the (SR) terminal on the enthalpy controller.

ENTHALPY CONTROLLER

RED

 

 

 

 

 

 

AIR

TR r_ TRI_""

BRN

 

 

 

 

/OUTDOOR[

A( C SOD+rn--

 

 

ENTHALPY

BLK

 

SENSOR)

RED

 

 

SRI-h+ID- ]1

 

F[S

(RETURN AIR I

 

 

 

[]

+ ENTHALPY

 

 

 

 

SENSOR

 

 

GRAY/ORN

 

 

LED

 

 

LWIRE HARNESS

 

GRAY/RED

JIN UNIT

 

 

 

 

NOTES:

1.Remove factory-installed jumper across SR and + before con- necting wires from return air sensor,

2.Switches shown in high outdoor air enthalpy state. Terminals 2 and 3 close on low outdoor air enthalpy relative to indoor air enthalpy.

3.Remove sensor mounted on back of control and locate in out- side airstream.

Fig. 30 --Outdoor and Return Air Sensor Wiring Connections for Differential Enthalpy Control

HH57AC077

ENTHALPY

CONTROL AND

OUTDOOR AIR

ENTHALPY SENSOR

HH57AC078 ENTHALPY

SENSOR (USED WITH

ENTHALPY CONTROL

FOR DIFFERENTIAL

ENTHALPY OPERATION)

÷÷

MOUNTING PLATE

e,

Fig. 31 --Differential Enthalpy Control,

Sensor and Mounting Plate (33AMKITENT006)

22

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Carrier 48TJ016-028 specifications Outdoor, JIN Unit
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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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