Carrier 48EJ, EW, EK, EY024-048 installation instructions Protective Devices, Belt Tension Adjustment

Page 48

Fig. 50 Ð Belt Tension Adjustment

Fig. 51 Ð Condenser-Fan Adjustment

Fig. 52 Ð Cooling Charging Chart,

48EJ,EK,EW,EY024-034

Fig. 53 Ð Cooling Charging Chart,

48EJ,EK,EW,EY038-048

Main Burners Ð For all applications, main burners are factory set and should require no adjustment.

MAIN BURNER REMOVAL (Fig. 55)

1.Shut off (®eld-supplied) manual main gas valve.

2.Shut off power to unit.

3.Remove heating access panel.

4.Disconnect gas piping from gas valve inlet.

5.Remove wires from gas valve.

6.Remove wires from rollout switch.

7.Remove sensor wire and ignitor cable from IGC board.

8.Remove 2 screws securing manifold bracket to basepan.

9.Remove 4 screws that hold the burner support plate flange to the vestibule plate.

10.Lift burner assembly out of unit.

11.Reverse procedure to re-install burners.

Filter Drier Ð Replace whenever refrigerant system is exposed to atmosphere.

Protective Devices

COMPRESSOR PROTECTION

Overcurrent Ð Each compressor has one manual reset, cali- brated trip, magnetic circuit breaker. Do not bypass connec- tions or increase the size of the circuit breaker to correct trouble. Determine the cause and correct it before resetting the breaker.

Overtemperature Ð Each 06D type compressor (024-038 units) has an internal protector to protect it against excessively high discharge gas temperatures.

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Contents Installation, Start-Up Service Instructions Field Fabricate Ductwork Instructions onUnit Leveling Tolerances Dimensions Degrees and InchesRoof Curb Sizes Weight Unit OperatingSize Ft-in 48EJ,EKD038 48EJE03848EJ,EKD044 48EJE044Base Unit Dimensions, 48EW,EY024-034 Base Unit Dimensions, 48EW,EY038-048 Unit Weight 48EJ,EK,EW,EYD024 48EJ,EK,EW,EYD028 48EJ,EK,EW,EYD03048EJ,EK,EW,EYD034 48EJ,EK,EW,EYD038Physical Data Unit 48EJ,EK,EW,EY4442/4602 4668/4828 4955/5115 Air Distribution Ð Thru-the-Bottom Combustion Fan Housing Location Unit Configuration Default Cooling Default Heating VAVField Control Remote Start/Stop Make Electrical Connections CCN SIOLED Electrical Data RLA LRAFLA LRA MCA Mocp FLA LRA FLAHacr NECQty 044Heating, Air Conditioning Minimum Circuit AmpsGND Ð Ground Terminal BlockDIP PECCCN Connection Approved Shielded Cables Manufacturer Cable Part no2413 or 8772Make Outdoor-Air Inlet Adjustments Color Code RecommendationsRED WhiteAdding Seal Strip to Top of Hood Sides Adding Foam Strip to Hood Side Mounting Angle With Tabs Attached to Filter Track Assembly Psychrometric Chart for Enthalpy Control Barometric Relief Damper and Power Exhaust Mounting Details Pressure Transducer Locations START-UP VFD Supply Air Pressure Set Point Pressure Control VFDSET Point Direct Digital Controls DIP Switch Congura Potentiometer Signal LevelsBuilding Pressure Signal Level VdcPower Exhaust Default Set Points DIP Switch CongurationDIP Switch Factory Settings Airflow 16,000 17,00018,000 19,000528 572 615 656 695 733 769 805 Fan Performance Ð Power Exhaust Motor LimitationsESP Standard Efficiency MotorsSequence of Operation Air Quantity LimitsUser Dened Set Points GAS HEATING, Variable AIR Volume VAV Units DEG. F Reset COMHIR Smoke Control Modes Device Pressurization Smoke Purge Evacuation Fire ShutdownCooling Capacity Staging Table, CV Units With 2 Compressors StagesCompressor Lubrication Manufacturer LubricantEvaporator Fan Service and Replacement Typical Gas Heating SectionEvaporator-Fan Motor Replacement Condenser-Fan AdjustmentBelt Tension Adjustment Protective DevicesGas Valve AHA IFCIfcb TranTypical Power Schematic 48EJ,EK,EW,EY024-034 208/230-3-60 Typical VAV 115-v Control Circuit Typical CV 115-v Control Circuit Typical VAV 24-v Control Circuit Typical CV 24-v Control Circuit Troubleshooting Typical Refrigerant Circuiting 48EJ,EK,EW,EY038,044 Typical Refrigerant Circuiting 48EJ,EK,EW,EY048 IGC Control Heating and Cooling IGC Control Board LED Alarms Control Board LED AlarmsI/O Channel Designations Base Module Ð CV I/O Channel Designations Base Module Ð VAVTerminal no Assignment SPTPackaged Service Training START-UP Checklist General
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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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