T.I.R. Bolts

Supply

 

 

 

 

Air

STS probe

 

Stream

 

Insulation

 

 

Back Panel

SRS probe

 

 

 

Supply Sensor

 

 

Mounting

 

 

Clamp

 

 

Sensor

 

 

Wires

 

Gasketed

Gasket

 

Cover

 

Mounting

 

 

 

Gasketed

Plate

 

2.5” Drip Loop

 

Support

 

 

 

Plate

 

 

 

Figure 6-21 Supply Sensor Positioning

6.22.3 Sensor Re--Installation

c Sensor DTS

a. Sensors STS and SRS

To properly position a supply sensor, the sensor must be fully inserted into the probe holder. Do not allow heat shrink covering to contact the probe holder. For proper placement of the sensor, be sure to position the enlarged positioning section of the sensor against the the side of the mounting clamp. This positioning will give the sensor the optimum amount of exposure to the supply air stream, and will allow the Controller to operate correctly. See Figure 6-21.

b Sensors RRS and RTS

Reinstall the return sensor as shown in Figure 6-22. For proper placement of the return sensor, be sure to position the enlarged positioning section of the sensor against the the side of the mounting clamp.

Mounting

Clamp Return Sensor 1.50 in. (38.1cm)

Figure 6-22 Return Sensor Positioning

The DTS sensor must have insulating material placed completely over the sensor to insure the coil metal temperature is sensed.

6.23 MAINTENANCE OF PAINTED SURFACES

The refrigeration unit is protected by a special paint system against the corrosive atmosphere in which it normally operates. However, should the paint system be damaged, the base metal can corrode. In order to protect the refrigeration unit from the highly corrosive sea atmosphere, or if the protective paint system is scratched or damaged, clean area to bare metal using a wire brush, emery paper or equivalent cleaning method. Immediately following cleaning, apply 2-part epoxy paint to the area. and allow to dry. After the first coat dries, apply a second coat.

6.24 COMPOSITE CONTROL BOX REPAIRS 6.24.1 Introduction

This procedure provides instructions for repair of the Carrier Transicold composite control box. Damage to the control box may be in the form of a chip or hole, a crack, a damaged thread insert or damage to the door hinge inserts. Generally, the object of the repair must be to ensure sufficient strength is restored to the damaged area and the repair must keep the box water tight. Information on repair kits and repair procedures for each type of damage is provided in the following paragraphs. Ambient temperature must be above 7°C (45°F) for proper curing of epoxy repairs.

T-309

6-18

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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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