SPACE TEMPERATURE AVERAGING Ð 4 SENSOR APPLICATION

SPACE TEMPERATURE AVERAGING Ð 9 SENSOR APPLICATION

Fig. 22 Ð Space Temperature Averaging Wiring

Remote Field Control Ð A switch closure across terminals R and W1 on TB-3 will initiate the Occupied mode. This can be done manually as well as through a ®eld-supplied timeclock.

Service Tool, Building Supervisor, and ComfortWorks™ Software Ð Access to the control board can be achieved through the terminal marked CCN via a 3-wire bus.

IMPORTANT: The default bus address is 0. The de- fault element number is 1. Refer to CCN literature to change the default values, if needed.

Carrier Comfort Network Interface Ð The 48E units can be connected to the CCN. The communication bus wiring is sup- plied and installed in the ®eld. Wiring consists of shielded, 3-conductor cable with drain wire.

The system elements are connected to the communication bus in a daisy chain arrangement. The positive pin of each system element communication connector must be wired to the positive pins of the system element on either side of it, the negative pins must be wired to the negative pins, and the

signal pins must be wired to signal ground pins. Wiring con- nections for CCN should be made at the 3-pin plug (CCN located at the base board). Consult CCN literature for fur- ther information.

Conductors and drain wire must be 20 AWG minimum stranded, tinned copper. Individual conductors must be in- sulated with PVC, PVC/nylon, vinyl, Te¯on, or polyethyl- ene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Te¯on with a minimum operating temperature range of −20 C to 60 C (−4 F to 140 F) is required. Table 5 lists cables that meet the requirements.

Table 5 Ð CCN Connection Approved Shielded Cables

MANUFACTURER

CABLE PART NO.

Alpha

2413 or 5463

American

A22503

Belden

8772

Columbia

02525

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Carrier EY024-048, 48EJ, EW, EK CCN Connection Approved Shielded Cables, Manufacturer Cable Part no, 2413 or, 8772, 02525

EW, EY024-048, EK, 48EJ specifications

The Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY024-068 are cutting-edge rooftop air conditioning units designed for commercial applications. These models are renowned for their reliability, energy efficiency, and innovative technologies aimed at providing optimal indoor comfort.

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Energy efficiency is paramount in today’s environmental landscape, and Carrier has ensured that these models meet stringent efficiency standards. They incorporate high-efficiency scroll compressors, which significantly reduce energy consumption while delivering powerful performance. The units are also equipped with variable speed fans that adjust airflow based on demand, further optimizing energy use.

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The Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY models utilize advanced controls and connectivity features, allowing for easy integration into building management systems. This connectivity enables remote monitoring and control, facilitating quick response to changing conditions and simplifying maintenance tasks.

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In conclusion, the Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY024-068 rooftop units are engineered to offer exceptional performance, energy efficiency, and durability. With their advanced technologies and user-friendly features, they stand out as reliable solutions for meeting diverse commercial cooling and heating needs, making them a popular choice for many businesses.