MOUNTING ANGLE (WITH TABS)

Fig. 31 Ð Mounting Angle (With Tabs) Attached to

Filter Track Assembly

BLACK SEAL STRIP (CENTERED)

FILTER COVER

Fig. 32 Ð Attaching Seal Strip to Filter Cover

Differential Enthalpy Sensor Installation Ð To install the con- trol, perform the following procedure:

1.Turn off all power. Ensure disconnect is locked out.

2.Remove the economizer inlet ®lters from the bottom of the right hand economizer hood. See Fig. 24.

3.Remove the factory-installed, 620-ohm jumper between terminals SR and + on the enthalpy control located in- side the outdoor air hood.

4.Connect the violet wire from the enthalpy sensor kit to the + terminal on the enthalpy control. Connect the blue wire from the enthalpy sensor kit to the SR terminal on the enthalpy control.

5.Turn the enthalpy control set point potentiometer clock- wise past the ``D'' setting on the enthalpy control to con- ®gure the control to operate on differential enthalpy. See Fig. 34.

6.Remove the return-air enthalpy sensor from the acces- sory package. Using the screws provided, mount the sen- sor inside the return duct near the unit. Do not locate the control too far from the unit, or the wires will not reach from the sensor to the control. On 48EW/EY units, the enthalpy sensor can be installed in the return air section of the unit, under the return air dampers.

7.Route the wires from the enthalpy sensor to the return air enthalpy control through the holes on the inside of the hinged ®lter access panel. The holes are blocked by plug buttons which should be removed.

8.Use ®eld-supplied wire ties to attach the violet wire to the + terminal and the blue wire to the SR terminal.

9.Replace economizer ®lters.

10.Return power to unit.

Disable Economizer Ð For applications where the econo- mizer will not be used (areas of high humidity), the econo- mizer should be disabled. To disable the economizer, perform the following:

1.Turn of power. Lock out disconnect.

2.Locate the OAT (Outdoor Air Thermostat) in the right hand outdoor air damper area.

3.Locate the splice connecting the violet wire coming from T24 on the base module board to the red wire coming from T29 on the base module board. Remove the wire nut and break the red to violet wire splice.

4.Cap off both wires. When the connection is broken the base module is fooled into thinking that the enthalpy is not acceptable and economizer operation is disabled.

HH57AC077

ENTHALPY CONTROL

 

 

HH57AC078

 

 

ENTHALPY SENSOR

C7400A1004

 

(USED WITH ENTHALPY

 

CONTROL FOR DIFFERENTIAL

 

+

ENTHALPY OPERATION)

 

 

Fig. 33 Ð Differential Enthalpy Control and Sensor

27

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Image 27
Carrier EY024-048, 48EJ, EW, EK installation instructions Mounting Angle With Tabs Attached to Filter Track Assembly
Page 26 Page 28

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.

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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