SUCTION PIPING — Connect suction piping as shown in Fig. 24 for face split coil or Fig. 25 for row split coil.

Suction line from coil connection to end of the 15-diameter- long riser should be same tube size as coil connection to ensure proper refrigerant velocity.

Refer to Carrier System Design Manual, Part 3, and size re- maining suction line to compressor for a pressure drop equiva- lent to 2.0 F. This will provide a total suction line header pres- sure drop equivalent to approximately 2.5 F. Refer to Fig. 26 for piping risers to the compressor.

To minimize the possibility of flooded starts and compres- sor damage during prolonged light load operation, install an ac- cumulator in the suction line or a solenoid in the liquid line of last-on, first off split in row-split applications.

EXPANSION VALVE PIPING — Distributor nozzles sized for acceptable performance for a range of conditions are facto- ry supplied. Use the AHU (Air-Handling Unit) selection pro- gram in the Carrier electronic catalog to select optimal nozzle sizes. Replace factory nozzle as necessary for best perfor- mance. See Fig. 27.

Thermostatic expansion valves are field supplied. See Fig. 27.

NOTE: Be sure that correct nozzle is installed in each distribu- tor before installing expansion valve. Before installing field- supplied nozzles, remove nozzle retainer rings and factory- installed minimum-sized nozzles from distributors.

Install expansion valve (Fig. 27) as follows:

1.Wrap wet cloths around valve body to prevent excessive heat from reaching diaphragm and internal parts. Do not allow water to enter system. Disassemble expansion valve before soldering, if accessible, for easy reassembly. Use 95-5tin-antimony soft solder.

2.Solder expansion valve outlet directly to distributor un- less:

a.An adapter bushing or coupling is supplied by the factory (solder adapter to distributor first, then to expansion valve).

b.Hot gas bypass is required. (See Hot Gas Bypass section, below.)

3.Solder expansion valve equalizer line to suction line and locate control bulb on suction line as in Fig. 24 or 25.

4.Insulate expansion valve body, diaphragm assembly and control bulb area to prevent charge migration and exces- sive condensation.

5.Install filter drier ahead of expansion valve to ensure sat- isfactory valve operation.

HOT GAS BYPASS — When low-load operation requires use of hot gas bypass, hot gas must be introduced between ex- pansion valve and distributor. See Table 9.

Install hot gas bypass connector (Fig. 28) in coil split that is first on, last off as follows:

1.Remove distributor nozzle and retainer ring (area A) from distributor and reinstall in inlet (area B) of side connector.

2.Solder side connector outlet to distributor inlet, using silver solder or equivalent with 1300 to 1500 F melt temperature.

3.Silver-solder expansion valve outlet to side connector inlet.

4.If required, install factory-supplied adapter bushing or coupling to connector inlet before soldering to expansion valve outlet.

TXV — Thermostatic Expansion Valve

Fig. 24 — Face Split Coil Suction Line Piping

TXV — Thermostatic Expansion Valve

Fig. 25 — Row Split Coil Suction Line Piping

Fig. 26 — Suction Line Riser Piping

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Carrier 39LC, 39LB, 39LD, 39LA, 39LE, 39LF, 39LH03-25, 39LG specifications Face Split Coil Suction Line Piping
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39LG, 39LH03-25, 39LD, 39LE, 39LB specifications

The Carrier 39 series, encompassing models 39LA, 39LF, 39LC, 39LB, and 39LE, represents a prominent line of rooftop packaged units that combine robust performance, energy efficiency, and advanced technology for commercial applications. Designed to provide reliable heating and cooling solutions, these units stand out for their versatility and innovative features.

The 39LA model offers high efficiency and flexibility, making it ideal for various building types. It incorporates advanced economizer capabilities that enhance indoor air quality while reducing energy costs. The unit is equipped with a dual-walled cabinet, which not only improves durability but also ensures quiet operation, making it suitable for noise-sensitive environments.

The 39LF model further enhances energy savings, featuring a unique hybrid heat pump system. This system allows for both heating and cooling through an integrated design, reducing the need for separate systems and streamlining maintenance requirements. The 39LF also boasts high Seasonal Energy Efficiency Ratio (SEER) ratings, contributing to lower operating costs without compromising comfort.

The 39LC variant excels in humid climates, employing advanced dehumidification technologies that effectively manage indoor moisture levels. This model is often utilized in environments such as gyms, restaurants, and hotels where humidity control is vital. Its variable-speed compressors adjust output based on demand, optimizing energy consumption while maintaining consistent comfort levels.

The 39LB model focuses on enhanced filtration and air quality improvements. Its engineered design accommodates high-efficiency particulate air (HEPA) filters, crucial for spaces that require stringent air quality standards. This model also includes smart controls that allow for precise temperature adjustments, ensuring optimal comfort in any setting.

Finally, the 39LE unit emphasizes user-friendly interfaces and smart technology integration. The built-in Wi-Fi capability enables remote monitoring and operation, allowing managers to adjust settings from anywhere, improving overall energy management. Additionally, the 39LE’s compatibility with Building Management Systems (BMS) facilitates seamless integration into existing setups.

In summary, the Carrier 39 series 39LA, 39LF, 39LC, 39LB, and 39LE present a comprehensive array of features designed for various commercial heating and cooling applications. With an emphasis on energy efficiency, advanced air quality management, and user-friendly technology, these units continue to set the standard for rooftop packaged units in the industry. Their innovative characteristics not only enhance comfort but also promote sustainability, making them a smart choice for modern commercial environments.
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