NOTES:

1.Torque set screws on blower wheel to 70 in. lbs ± 2 in. lbs.

2.Torque set screw on propeller fan to 15 in. lbs ± 2 in. lbs.

3.Dimensions are in inches.

Fig. 65 — Typical Gas Heating Section

To inspect blower wheel, remove heat exchanger access panel. Shine a flashlight into opening to inspect wheel. If clean- ing is required, remove motor and wheel assembly by remov- ing screws holding motor mounting plate to top of combustion fan housing (Fig. 65 and 66). The motor, scroll, and wheel assembly can be removed from the unit. Remove scroll from plate. Remove the blower wheel from the motor shaft and clean with a detergent or solvent. Replace motor and wheel

 

assembly.

 

EVAPORATOR COIL — Remove access panels and clean as

 

required with commercial coil cleaner.

 

CONDENSER COIL — Clean condenser coil annually and

 

as required by location and outdoor-air conditions. Inspect coil

 

monthly; clean as required.

 

CONDENSATE DRAIN — Check and clean each year at

 

start of cooling season. In winter, keep drains and traps dry.

 

FILTERS — Clean or replace at start of each heating and cool-

 

ing season, or more often if operating conditions require. Refer

 

to Tables 1A and 1B for type and size.

 

NOTE: The unit requires industrial grade throwaway filters

Fig. 66 — Gas Heat Section Details

capable of withstanding face velocities up to 625 fpm.

OUTDOOR-AIR INLET SCREENS — Clean screens with

 

 

steam or hot water and a mild detergent. Do not use disposable

 

filters in place of screens. See Fig. 37 for location of screens

 

(filter track assembly).

90

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Carrier 48AW, 48EW, 48EY024-068, 48AY020-060, 48EK, 48AK, 48AJ, 48EJ specifications Typical Gas Heating Section
Page 89 Page 91

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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