ECONOMIZER

HOOD

LOCATION BAROMETRIC RELIEF OR POWER EXHAUST “SIDE #2”

23.28”

TYP

“END #2”

“SIDE #1”

“END #1”

23.28”

42.62”

42.62

TYP

ALTERNATE LOCATION (END)

R/A S/A

a48-8244

42.56”

ECONOMIZER

HOOD

42” MIN.

12.94

R/A(UNIT

OPENING)

S/A

J BOX

PLENUM RATED CABLE

(FIELD SUPPLIED)

J BOX

NOTE: 020-050 SIZES SHOWN (2 POWER EXHAUST FANS). SIZES 051 AND 060 HAVE 3 POWER EXHAUST FANS. ALL UNIT SIZES HAVE THE SAME SIZE POWER EXHAUST.

Fig. 31 — Power Exhaust Relocated to Side Return Duct

a48-3808

NOTES:

1.Unless otherwise specified, all dimensions are to outside of part.

2.Dimensions are in inches.

3.On 48AW,AY units, accessory barometric relief or power exhaust must be mounted in the field-supplied return ductwork.

Fig. 32 — Barometric Relief Damper and Power Exhaust Mounting Details

Step 11 — Route VAV Static Pressure Sensors

VAV DUCT PRESSURE TRANSDUCER — The VAV duct pressure transducer (VAV inverter pressure transducer) is locat- ed behind the filter access door on the lower inner panel. See Fig. 33. A section of field-supplied 1/4-in. plastic tubing must be run from the high pressure tap on the differential pressure switch and connected to a field-supplied tap in the supply-air duct. The tap is usually located 2/3 of the way out on the main supply duct. Remove plug button in panel to route tubing.

VAV BUILDING PRESSURE TRANSDUCER — The VAV building pressure transducer (modulating power exhaust pres- sure transducer) is located behind the filter access door on the

lower inner panel. See Fig. 33. A section of field-supplied 1/4-in. plastic tubing must be run from the high pressure tap on the differential pressure switch to the conditioned space. The pressure tube must be terminated in the conditioned space where a constant pressure is required. This location is usually in an entrance lobby so that the building exterior doors will open and close properly. Remove plug button in panel to route tubing.

The low pressure tap is factory-routed to the atmosphere. For a positive-pressure building, route the high tap to building air and low tap to atmosphere. For a negative-pressure

34

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Image 34
Carrier 48AJ installation instructions Route VAV Static Pressure Sensors, A48-8244, A48-3808
Page 33 Page 35

48AJ 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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