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1.

Mounting Screw

6.

Control Circuit Power Connection

2.

Micro-Link 2i Control/DataCORDER Module

 

(Location: In back of controller)

3.

Connectors

7.

Software Programming Port

4.

Test Points

8.

Battery Pack

5.

Fuses

9.

Expansion Module

Figure 3- 4 Control and Expansion Modules

3.1.3 Controller

CAUTION

Do not remove wire harnesses from control- ler modules unless you are grounded to the unit frame with a static safe wrist strap.

CAUTION

Unplug all controller module wire harness connectors before performing arc welding on any part of the container.

NOTE

Do not attempt to service the controller mod- ules. Breaking the seal will void the warranty.

The Micro-Link 2i controller is a dual module microprocessor as shown in Figure 3- 4. It is fitted with test points, harness connectors and a software card programming port.

3.2 CONTROLLER SOFTWARE

c.Provide ability to read and (if applicable) modify the Configuration Software Variables, Operating Soft- ware Function Codes and Alarm Code Indications.

d.Provide a Pre-Trip step-by-step checkout of refrigera- tion unit performance including: proper component operation, electronic and refrigeration control opera- tion, heater operation, probe calibration, pressure limiting and current limiting settings.

e.Provide battery powered ability to access or change selected codes and set point without AC power con- nected

f.Provide the ability to reprogram the software through the use of a memory card. The memory card automat- ically downloads new software to the controller when inserted.

3.2.1Configuration Software (Configuration Vari- ables)

The controller software is a custom designed program that is subdivided into the Configuration Software and the Operational Software. The controller software performs the following functions:

a. Control supply or return air temperature to required limits, provide modulated refrigeration operation, economized operation, unloaded operation, electric heat control and defrost. Defrost is performed to clear build up of frost and ice and ensure proper air flow across the coil.

b.Provide default independent readouts of set point and supply or return air temperatures.

The Configuration Software is a variable listing of the components available for use by the Operational Software. This software is factory installed in accordance with the equipment fitted and options listed on the original purchase order. Changes to the Configuration Software are required only when a new controller hase been installed or a physical change has been made to the unit such as the addition or removal of an option. A Configuration Variable list is provided in Table 3-4. Change to the factory installed Configuration Software is achieved via a configuration card or communications.

3-3

T-309

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Carrier 69NT20-531-300 manual Controller Software
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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.
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