TABLE OF CONTENTS (cont)

OPERATION

4-1

4.1

INSPECTION (Before Starting)

4-1

4.2

CONNECT POWER

4-1

 

4.2.1 Connection To 380/460 vac Power

4-1

4.3

ADJUST FRESH AIR MAKEUP VENT

4-1

 

4.3.1 Upper Fresh Air Makeup Vent

4-1

4.4CONNECT REMOTE MONITORING

RECEPTACLE

4-2

4.5

STARTING AND STOPPING INSTRUCTIONS

4-2

4.5.1

Starting the Unit

4-2

4.5.2

Stopping the Unit

4-2

4.6

START-UP INSPECTION

4-2

4.6.1

Physical Inspection

4-2

4.6.2 Check Controller Function Codes

4-2

4.6.3

Complete Inspection

4-2

4.7

PRE-TRIP DIAGNOSIS

4-2

4.8

OBSERVE UNIT OPERATION

4-3

4.8.1

Probe Check

4-3

4.9 SEQUENCE OF OPERATION

4-4

4.9.1 Sequence Of operation - Compressor Phase Sequence

4-5

4.9.2 Sequence Of Operation - Perishable Mode Cooling

4-5

4.9.3 Sequence Of Operation -

 

Perishable Mode Heating

4-6

4.9.4 Sequence Of operation - Frozen Mode Cooling

4-6

4.9.5

Sequence Of Operation - Defrost

4-6

TROUBLESHOOTING

5-1

5.1

UNIT WILL NOT START OR STARTS THEN STOPS

5-1

5.2

UNIT OPERATES LONG OR CONTINUOUSLY IN COOLING

5-1

5.3

UNIT RUNS BUT HAS INSUFFICIENT COOLING

5-2

5.4

UNIT WILL NOT HEAT OR HAS INSUFFICIENT HEATING

5-2

5.5

UNIT WILL NOT TERMINATE HEATING

5-2

5.6

UNIT WILL NOT DEFROST PROPERLY

5-2

5.7

ABNORMAL PRESSURES (COOLING)

5-3

5.8

ABNORMAL NOISE OR VIBRATIONS

5-3

5.9

CONTROLLER MALFUNCTION

5-4

5.10

NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW

5-4

5.11

THERMOSTATIC EXPANSION VALVE MALFUNCTION

5-4

5.12

AUTOTRANSFORMER MALFUNCTION

5-4

5.13

WATER-COOLED CONDENSER OR WATER PRESSURE SWITCH

5-4

5.14

COMPRESSOR OPERATING IN REVERSE

5-5

5.15

ABNORMAL TEMPERATURES

5-5

5.16

ABNORMAL CURRENTS

5-5

iii

T309

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Carrier 69NT20-531-300 manual Connect Remote Monitoring, Check Controller Function Codes

69NT20-531-300 specifications

The Carrier 69NT20-531-300 is a cutting-edge rooftop unit designed to meet the demanding requirements of commercial heating and cooling applications. This model embodies Carrier’s commitment to energy efficiency, reliability, and advanced technological features that enhance indoor comfort while minimizing operational costs.

One of the standout features of the Carrier 69NT20-531-300 is its high energy efficiency. It is equipped with advanced compressor technology that optimizes performance while reducing energy consumption. This ensures that businesses can maintain a comfortable indoor climate without incurring exorbitant utility bills. With a high Seasonal Energy Efficiency Ratio (SEER) and Energy Efficiency Ratio (EER), users can expect not only enhanced comfort but also significant cost savings over time.

The cooling capabilities of the 69NT20-531-300 are complemented by its robust heating options. This unit utilizes a gas heat exchanger, ensuring quick and even heating throughout the space. The combination of cooling and heating capabilities in one compact unit makes it a versatile choice for various applications, including retail spaces, offices, and warehouses.

In addition to its impressive performance specifications, the Carrier 69NT20-531-300 incorporates innovative technologies that further enhance its functionality. The unit comes with advanced controls, allowing for precise temperature regulation and zoning capabilities. This ensures that different areas of a building can maintain their desired temperatures based on usage, improving overall energy efficiency.

Durability is another hallmark of the Carrier 69NT20-531-300. The unit is constructed with high-quality materials and features a weather-proof cabinet that protects it from the elements, ensuring long-term reliability even in harsh conditions. Furthermore, its modular design simplifies maintenance, making it easy for technicians to access critical components.

The 69NT20-531-300 is also designed with low noise operation in mind. It employs sound-dampening technology to ensure that operations are quiet, making it an ideal choice for locations where noise reduction is a priority, such as schools or healthcare facilities.

Overall, the Carrier 69NT20-531-300 stands out as a premier choice for businesses looking for an efficient, reliable, and feature-rich rooftop HVAC unit. Its blend of energy efficiency, advanced technology, and durability positions it as a leader in commercial heating and cooling solutions, making it a valuable investment for any commercial property.