Step 5 — Install Flue Hood

48AJ,AK,AW,AY020-050 UNITS — Flue hood is shipped inside gas section of unit. To install, secure flue hood to access panel. See Fig. 14.

48AJ,AK,AW,AY051 AND 060 UNITS — Flue hood and wind baffle are shipped inside gas section of unit. To install, se- cure flue hood to access panel. Install the two pieces of the wind baffle over the flue hood. See Fig. 15.

NOTE: When properly installed, flue hood will line up with combustion fan housing. See Fig. 16.

a48-3712

Fig. 14 — Flue Hood Location

(48AJ,AK,AW,AY020-050 Units)

GAS SECTION

ACCESS PANEL

FLUE HOOD

WIND

BAFFLE

TOP VIEW

SIDE VIEW

a48-4076

Fig. 15 — Flue Hood Location

(48AJ,AK,AW,AY051 and 060 Units)

a48-3823

Fig. 16 — Combustion Fan Housing Location

(48AJ,AK,AW,AY020-050 Shown)

Step 6 — Trap Condensate Drain — See Fig. 4-9 for drain location. Condensate drain is open to atmosphere and must be trapped. Install a trapped drain at the drain location. One 1-in. FPT coupling is provided inside the unit evaporator section for condensate drain connection. A trap at least 4-in. deep must be used. See Fig. 17. Trap must be installed to pre- vent freeze-up.

Condensate pans are sloped so that water will completely drain from the condensate pan to comply with indoor air quali- ty guidelines. The condensate drain pans are not insulated.

a48-3714

Fig. 17 — Condensate Drain Trap Piping Details

(Typical Roof Curb or Slab Mount Shown)

Step 7 — Install Gas Piping — Unit is equipped for use with natural gas. Installation must conform with local building codes or, in the absence of local codes, with the Na- tional Fuel Gas Code, ANSI Z223.1.

Install manual gas shutoff valve with a 1/8-in. NPT pressure tap for test gage connection at unit. Field gas piping must in- clude sediment trap and union. See Fig. 18. An 1/8-in. NPT is also located on the gas manifold adjacent to the gas valve.

WARNING

Do not pressure test gas supply while connected to unit. Always disconnect union before servicing. Serious injury could result.

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Carrier 48AJ installation instructions Install Flue Hood, A48-3712, A48-3823, A48-3714
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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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