START-UP CHECKLIST

MODEL NO.:

 

 

SERIAL NO.:

 

 

SOFTWARE VERSION (SEE FIG. 16)

 

TECHNICIAN:

 

DATE:

 

 

 

 

 

PRE-START-UP:

VERIFY THAT DIP SWITCH SETTINGS ARE CORRECT

VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS

VERIFY INSTALLATION OF ECONOMIZER HOOD

VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES

VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS

VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT

CHECK GAS PIPING FOR LEAKS

CHECK THAT INDOOR-AIR FILTERS ARE CLEAN AND IN PLACE

VERIFY THAT UNIT IS LEVEL WITHIN TOLERANCES

CHECK FAN WHEELS AND PROPELLERS FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREW IS TIGHT

VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED

VERIFY THAT SUCTION, DISCHARGE, AND LIQUID SERVICE VALVES ON EACH CIRCUIT ARE OPEN

START-UP

ELECTRICAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SUPPLY VOLTAGE L1-L2

 

 

 

 

 

 

L2-L3

 

 

L3-L1

 

 

 

 

 

 

COMPRESSOR AMPS Ð COMPRESSOR NO. 1

L1

 

 

L2

 

 

L3

 

Ð COMPRESSOR NO. 2

 

L1

 

 

L2

 

 

L3

 

SUPPLY FAN AMPS (CV)

 

 

 

 

 

 

 

 

 

 

 

EXHAUST FAN AMPS

 

 

 

 

(VAV)

 

 

 

 

 

*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*VAV fan supply amps reading must be taken with a true RMS meter for accurate readings.

 

 

 

 

ADJUST VARIABLE FREQUENCY DRIVE (VFD) TO APPLICATION REQUIREMENTS.

 

 

 

 

TEMPERATURES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTDOOR-AIR TEMPERATURE

 

 

 

 

 

 

 

 

 

 

F DB (Dry Bulb)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RETURN-AIR TEMPERATURE

 

 

 

 

 

 

 

 

 

 

F DB

 

F WB (Wet Bulb)

 

 

 

 

COOLING SUPPLY AIR

 

 

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS HEAT SUPPLY AIR

 

 

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRESSURES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS INLET PRESSURE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IN. WG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS MANIFOLD PRESSURE

STAGE NO. 1

 

 

 

 

 

 

 

IN. WG

STAGE NO. 2

 

 

 

IN. WG

REFRIGERANT SUCTION

CIRCUIT NO. 1

 

 

 

 

 

 

 

 

PSIG

CIRCUIT NO. 2

 

 

 

 

PSIG

REFRIGERANT DISCHARGE

CIRCUIT NO. 1

 

 

 

 

 

 

 

 

PSIG

CIRCUIT NO. 2

 

 

 

 

PSIG

VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGE 48

CL-1

Page 63
Image 63
Carrier EY024-048, 48EJ, EW, EK installation instructions START-UP Checklist

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.