Make Piping Connections, Check Defrost Thermostat

If TXV installation is required, remove existing AccuRater® from indoor coil. Refer to Figs. 4 and 5 and install TXV kit as follows:

1.Install suction tube adapter.

2.Install liquid flare-to-sweat adapter.

3.Connect external equalizer tube to fitting on suction tube adapter.

4.Position sensing bulb on horizontal portion of suction tube adapter. Secure using supplied hardware.

5.Insulate bulb after installation. (See Fig. 5.)

6.Leak check all connections.

COIL

SENSING

BULB

EQUALIZER

TUBE

THERMOSTATIC

EXPANSION

VALVE

A88382

Fig. 4—Typical TXV Installation

feeder tubes, there is a 3/8-in. O.D. stub tube approximately 2 in. long. (See Fig. 6.) The defrost thermostat should be located on stub tube. Note that there is only 1 stub tube used with liquid header, and on most units it is the bottom circuit.

FEEDER TUBE

STUB TUBE

DEFROST

THERMOSTAT

A97517

Fig. 6—Defrost Thermostat Location

Step 9—Make Piping Connections

Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal injury or death. Use all service ports and open all flow control devices, including solenoid valves.

10 O'CLOCK

2 O'CLOCK

STRAP

SUCTION TUBE

8 O'CLOCK

7⁄8 IN. OD & SMALLER

SENSING BULB

4O'CLOCK

LARGER THAN 7⁄8 IN. OD

If ANY refrigerant tubing is buried, provide a 6 in. vertical rise at service valve. Refrigerant tubing lengths up to 36 in. may be buried without further special consideration. For lengths longer than 36 in., refer to Application Guideline and Service Manual — Residential Split System Air Conditioners and Heat Pumps.

To prevent damage to unit or service valves observe the following:

•Use a brazing shield.

•Wrap service valves with wet cloth or use a heat-sink material.

A81032

Fig. 5—Positioning of Sensing Bulb

Step 7—Check Outdoor AccuRater® Piston

Check outdoor unit piston. Remove retainer on liquid service valve and check piston size with matching number listed on outdoor unit rating plate.

Step 8—Check Defrost Thermostat

Check defrost thermostat to ensure it is properly located and securely attached. There is a liquid header with a brass distributor and feeder tube going into outdoor coil. At the end of 1 of the

Outdoor units may be connected to indoor section using accessory- tubing package or field-supplied refrigerant grade tubing of correct size and condition. For tubing requirements beyond 50 ft, substan- tial capacity and performance losses can occur. Following the recommendations in the Residential Split System Long-Line Application Guideline will reduce these losses. Refer to Table 1 for field tubing equivalent line length. Refer to Table 2 for accessory requirements.

For buried line applications greater than 36 in., refer to Table 2 and Residential Split System Buried Line Application Guideline. Buried line applications may not exceed 100 ft.

If refrigerant tubes or indoor coil are exposed to atmosphere, they must be evacuated to 500 microns to eliminate contamination and moisture in the system.

38BYG, 38BYC specifications

The Carrier 38BYC and 38BYG are part of Carrier's innovative range of commercial HVAC systems, specifically engineered to offer superior cooling and heating solutions. With their modular design, these units cater to a variety of commercial applications, providing energy-efficient climate control that meets the diverse needs of businesses.

One of the standout features of the Carrier 38BYC and 38BYG is the incorporation of advanced inverter technology. This technology allows the system to adjust its compressor speed in real time, optimizing energy consumption while ensuring consistent indoor comfort. This capability significantly reduces operational costs compared to traditional HVAC systems that operate at fixed speeds.

Both models boast enhanced cooling and heating capabilities with high energy efficiency ratings, helping businesses reduce their carbon footprint while enjoying substantial savings on energy bills. The efficiency is further reinforced by the use of environmentally friendly refrigerants, aligning with global efforts to minimize the impact of refrigeration technologies on the environment.

Another key characteristic of the 38BYC and 38BYG is their quiet operation. Engineered with sound-dampening features, these units provide a comfortable indoor experience without the disruptive noise often associated with HVAC systems. This makes them particularly suitable for commercial spaces where a peaceful environment is crucial, such as offices, hotels, and healthcare facilities.

Connectivity is a significant aspect of these models. Equipped with smart technology, the Carrier 38BYC and 38BYG support remote monitoring and control through mobile applications. This allows facility managers to adjust settings, monitor performance, and schedule maintenance tasks from virtually anywhere, enhancing operational efficiency and convenience.

In terms of installation and maintenance, both models are designed with ease of access in mind. The modular design simplifies installation and servicing, ensuring that downtime is minimized, and system longevity is maximized. Their compact footprint makes them versatile enough to fit in various architectural spaces, making them an ideal choice for retrofitting or new constructions.

Overall, the Carrier 38BYC and 38BYG systems encapsulate modern HVAC technology with their emphasis on energy efficiency, quiet operation, smart connectivity, and ease of maintenance. These traits not only serve businesses’ immediate cooling and heating needs but also contribute to a more sustainable and cost-effective future. Whether for a small office or a large commercial establishment, these units deliver a comprehensive climate control solution tailored for today’s ever-evolving business landscape.