Manuals / Carrier / Kitchen Appliance / Refrigerator

Carrier 69NT20-531-300 manual Pull Down Falling Rising, Controller Operation -- Perishable Mode

Models: 69NT20-531-300

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1.At every power up.

2.At the end of every defrost.

3.After every diagnostic check that does not fall out- side of the limits as outlined above.

d. Probe Check

A defrost cycle probe check is accomplished by energizing just the evaporator motors for eight minutes at the end of the normal defrost. At the end of the eight minute period the probes will be compared to a set of predetermined limits. The defrost indicator will remain on throughout this period.

Any probe(s) determined to be outside the limits will cause the appropriate alarm code(s) to be displayed to identify which probe(s) needs to be replaced. The P5 Pre-Trip test must be run to inactivate alarms.

4.9 SEQUENCE OF OPERATION

General operation sequences for cooling, heating and defrost are provided in the following subparagraphs. Schematic representation of controller action are provided in Figure 4-2 and Figure 4-3.Refer to Section 3 for detailed descriptions of special events and timers that are incorporated by the controller in specific modes of operation.

PULL DOWN

 

FALLING

 

RISING

 

 

TEMPERATURE

 

 

TEMPERATURE

 

 

 

 

 

 

+2.5_C

 

+2.5_C

 

 

(4.5_F)

 

(4.5_F)

 

START UNLOADED,

 

MODULATED

 

MODULATED

TRANSITION TO

 

 

 

COOLING

 

ECONOMIZED

 

 

COOLING

 

UNLOADED

 

OPERATION

 

 

UNLOADED

 

 

 

 

 

 

 

 

+.20_C

 

+.20_C

 

UNLOADED OPERATION

SET POINT

 

SET POINT

AIR CIRCULATION

--0.20_C

 

--0.20_C

 

AIR CIRCULATION

AIR CIRCULATION

 

--0.5_C

--0.5_C

 

 

 

 

 

(0.9_F)

 

(0.9_F)

 

HEATING

 

HEATING

 

HEATING

NOTE: TEMPERATURES INDICATIONS ARE ABOVE OR BELOW SET POINT

Figure 4-2 Controller Operation -- Perishable Mode

T-309

4-4

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Carrier 69NT20-531-300 manual Pull Down Falling Rising, Controller Operation -- Perishable Mode
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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.