LOCATION BAROMETRIC RELIEF OR POWER EXHAUST “SIDE #2”

23.28”

TYP

“END #2”

“END #1”

42.62

TYP

ALTERNATE LOCATION (END)

ECONOMIZER

HOOD

“SIDE #1”

23.28” 42.62”

R/AS/A

42.56”

ECONOMIZER

HOOD

42” MIN.

12.94

R/A(UNIT

OPENING)

S/A

J BOX

PLENUM RATED CABLE

(FIELD SUPPLIED)

J BOX

NOTE: 024-048, 020-050 SIZES SHOWN (2 POWER EXHAUST FANS) 060, 054-068 SIZES HAVE 3 POWER EXHAUST FANS. ALL UNIT SIZES HAVE THE SAME SIZE POWER EXHAUST.

Fig. 55 — Power Exhaust Relocated to Side Return Duct

BASE MODULE

START-UP

Use the following information and Start-Up Checklist on pages CL-1 and CL-2 to check out unit PRIOR to start-up.

DISCRETE OUTPUTS

COMP #2 UNLOADER COM COMP #1 UNLOADER

CYCLIC COND FAN COM CONT COND FAN

POWER EXHAUST

COM POWER EXHAUST

ELEC HEAT 2

COM

ELEC HEAT 1

T39

T38

T37

T36

T35

T34

T31

T32

T33

T30

T29

T28

UL2

UL1

Unit Preparation — Check that unit has been installed in accordance with these installation instructions and applicable codes.

Compressor Mounting — Loosen the compressor hold-down bolts until sidewise movement of the washer under each holddown bolt head can be obtained. Do not loosen com- pletely as bolts are self-locking and will maintain adjustment.

Service Valves — Ensure that the suction, discharge, and liquid line service valves are open. Damage to the compressor could result if they are left closed.

ECONOMIZER

4-20 mA OUPUT

T26

Internal Wiring — Check all electrical connections in unit control boxes; tighten as required.

Fig. 56 — Wiring Field-Supplied Unloaders for

Constant Volume Units

Refrigerant Service Ports — Each refrigerant system has one suction port located in the top of the compressor motor casing. All units also have one service port on the liquid line valve and one on the compressor discharge valve. Be sure that caps on the ports are tight.

58

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Carrier 48AW, 48EW, 48EY024-068, 48AY020-060, 48EK, 48AK, 48AJ, 48EJ specifications Start-Up
Page 57 Page 59

48EJ, 48AJ, 48AK, 48EK, 48AY020-060 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.

One of the standout features of these units is their advanced cooling and heating capabilities. They employ a multi-stage compressor system that allows for precise temperature control, accommodating various load requirements. This flexibility is particularly beneficial in commercial settings where the cooling load can fluctuate throughout the day.

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.

In terms of construction, these rooftop units feature a robust design that enhances durability and longevity. The cabinet is constructed to withstand harsh weather conditions, ensuring reliable performance year-round. Additionally, the units are equipped with corrosion-resistant coatings, particularly useful in coastal environments where salt exposure can be a concern.

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.

Noise reduction is another key characteristic of these models. They are designed with sound-absorbing insulation and low-noise fan blades to ensure quiet operation, making them suitable for noise-sensitive environments such as schools and hospitals.

These units are also available with various options for air filtration and dehumidification. The use of high-efficiency air filters enhances indoor air quality by trapping dust, pollen, and other airborne particles. Enhanced dehumidification capabilities ensure that spaces remain comfortable even in humid conditions.

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.
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