Carrier 38YSA Thermostatic Expansion Valve, Check Defrost Thermostat, Make Piping Connections

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Step 6—Thermostatic Expansion Valve

For proper unit operation and reliability, units must be installed with field-supplied hard shutoff TXV. Do not install with evaporator coils having capillary tube metering devices or pistons.

FEEDER TUBE

STUB TUBE

Due to system design, this unit must be installed with a factory-listed indoor section. Non-approved coils could cause performance and reliability problems. Refer to pre-sale litera- ture for approved indoor sections.

The outdoor section is factory equipped with a hard shut-off TXV for metering refrigerant during heating mode. See Fig. 5 and 6 for location of TXV and sensing bulb. This heat pump must be matched with an approved indoor fan coil equipped with a hard shut-off TXV. See Product Data literature for approved indoor units.

Step 7—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 feeder tubes, there is a 3/8-in. O.D. stub tube approximately 3 in. long. (See Fig. 7.) 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.

Step 8—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.

DEFROST

THERMOSTAT

A97517

Fig. 7—Defrost Thermostat Location

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 above 36 in., consult your local distributor.

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.

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.

SENSING BULB

DISCHARGE

MUFFLER

10 O'CLOCK

2 O'CLOCK

SENSING BULB

STRAP

SUCTION TUBE

8 O'CLOCK

4 O'CLOCK

 

 

7⁄8 IN. OD & SMALLER

LARGER THAN 7⁄8 IN. OD

STRAINER

TXV

 

 

 

A81032

 

A96433

Fig. 5—Positioning of Sensing Bulb

Fig. 6—TXV Location on Outdoor Section

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Contents Unpack Unit Check Equipment and Job SiteOperating Ambients DimensionsInstall on a Solid, Level Mounting Pad Clearance RequirementsThermostatic Expansion Valve Check Defrost ThermostatMake Piping Connections Make Electrical Connections Accessory UsageInstall Electrical Accessories Start-UpCompressor Crankcase Heater Programmable Other HP Thermostat VAC COM Not Used Trouble Optional Outdoor Sensor Connection Smart Heat Pump W2D W2T JW1 Wiring Diagram Notes Cooling only Procedure Example Heating only ProcedureCheck Charge Final Checks Required Liquid-Line Temperature F

38YSA specifications

The Carrier 38YSA is a cutting-edge cooling solution designed to meet the demands of modern residential and commercial applications. Renowned for its energy efficiency and reliable performance, the 38YSA series represents the pinnacle of Carrier’s commitment to innovation in HVAC technology.

One of the standout features of the Carrier 38YSA is its energy efficiency. It utilizes advanced inverter technology, allowing it to adjust its cooling output based on the specific needs of the indoor environment. This technology not only reduces energy consumption but also minimizes fluctuations in temperature, providing a more consistent and comfortable living or working space. The unit achieves impressive SEER (Seasonal Energy Efficiency Ratio) ratings, making it an environmentally friendly choice.

The 38YSA is equipped with a variable-speed compressor, which optimizes performance by operating at different speeds. This capability allows the system to ramp up or down in accordance with the cooling load, ensuring optimal comfort and minimizing energy usage. This technology also translates to quieter operation, making the 38YSA ideal for residential neighborhoods and low-noise environments.

In terms of features, the Carrier 38YSA incorporates smart controls that can be operated remotely via mobile devices. This feature provides users with the flexibility to manage their cooling systems from anywhere, optimizing comfort while on the go. The user-friendly interface allows for easy programming of temperature schedules, further enhancing energy savings and comfort.

Durability is another characteristic that sets the Carrier 38YSA apart. The unit is engineered with robust materials and components designed to withstand harsh weather conditions. Its corrosion-resistant casing and high-quality condenser coils ensure longevity and reliable performance over the years.

Furthermore, the 38YSA is designed with eco-friendly refrigerants, contributing to a reduction in global warming potential, which aligns with increasing environmental regulations. The commitment towards sustainability is evident in Carrier’s entire product line, emphasizing the importance of creating energy-efficient and eco-conscious cooling systems.

Overall, the Carrier 38YSA is a sophisticated and efficient cooling solution, integrating advanced technologies to deliver optimal comfort, reliability, and energy savings. Its blend of innovative features, durable design, and environmental responsibility makes it a top choice for anyone seeking effective air conditioning solutions.
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