Carrier S4A5S - User Manual

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Installation Instructions

NOTE: Read the entire instruction manual before starting the installation.

SAFETY CONSIDERATIONS

IMPORTANT: This appliance shall only be installed by EPA qualified

personnel having appropriate certification. This appliance is not

intended for use by persons (including children) with reduced physical,

sensory or mental capabilities or lack of experience and knowledge,

unless they have been given supervision or instruction concerning use of

the appliance by a person responsible for their safety.

Improper installation, adjustment, alteration, service, maintenance, or

use can cause explosion, fire, electrical shock, or other conditions which

may cause death, personal injury, or property damage. Consult a

qualified installer, service agency, or your distributor or branch for

information or assistance. The qualified installer or agency must use

factory-authorized kits or accessories when modifying this product.

Refer to the individual instructions packaged with the kits or accessories

when installing.

Follow all safety codes. Wear safety glasses, protective clothing, and

work gloves. Use quenching cloth for brazing operations. Have fire

extinguisher available. Read these instructions thoroughly and follow all

warnings or cautions included in literature and attached to the unit.

Consult local building codes and current editions of the National

Electrical Code (NEC) NFPA 70. In Canada, refer to current editions of

the Canadian electrical code CSA 22.1.

Recognize safety information. This is the safety-alert symbol When

you see this symbol on the unit and in instructions or manuals, be alert to

the potential for personal injury. Understand these signal words;

DANGER, WARNING, and CAUTION. These words are used with the

safety-alert symbol. DANGER identifies the most serious hazards which

will result in severe personal injury or death. WARNING signifies

hazards which could result in personal injury or death. CAUTION is

used to identify unsafe practices which would result in minor personal

injury or product and property damage. NOTE is used to highlight

suggestions which will result in enhanced installation, reliability, or

operation.

GENERAL

NOTE: In some cases noise in the living area has been traced to gas

pulsations from improper installation of equipment.

1. This unit is intended to be installed in a location that is 10,000 feet

(3000 meters) above sea level or lower.

2. Locate unit away from windows, patios, decks, etc. where unit

operation sound may disturb customer.

3. Ensure that vapor and liquid tube diameters are appropriate for unit

capacity.

4. Run refrigerant tubes with no bends with centerline bend radius less

than 2.5 times the external pipe diameter.

5. Leave some slack between structure and unit to absorb vibration.

6. When passing refrigerant tubes through the wall, seal opening with

RTV or other pliable silicon-based caulk. (See Fig. 1.)

7. Avoid direct tubing contact with water pipes, duct work, floor

joists, wall studs, floors, and walls.

8. Do not suspend refrigerant tubing from joists and studs with a rigid

wire or strap which comes in direct contact with tubing (see Fig. 1).

9. Ensure that tubing insulation is pliable and completely surrounds

vapor tube.

10. When necessary, use hanger straps which are 1 in. (25 mm) wide

and conform to shape of tubing insulation. (See Fig. 1.)

11. Isolate hanger straps from insulation by using metal sleeves bent to

conform to shape of insulation.

12. Provision shall be made for expansion and contraction of long runs

of piping.

13. Piping and fittings shall be protected as far as possible against

adverse environmental effects. For example, the accumulation of

dirt and debris.

14. Piping should be installed to reduce the likelihood of hydraulic

shock damaging the system.

15. Certified piping and components must be used in order to protect

against corrosion.

16. Flexible pipe elements shall be protected against mechanical

damage, excessive stress by torsion, or other forces. They should be

checked for mechanical damage annually.

17. Piping material, routing, and installation shall be include protection

from physical damage in operation and service, and be in

compliance with the national and local codes and standards of the

installation site.

18. When setting up refrigerant piping, precautions shall be taken to

avoid excessive vibration or pulsation

S4A5S

HORIZONTAL AIR CONDITIONER

WITH R-410A REFRIGERANT

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing, modifying, or servicing system, main electrical

disconnect switch must be in the OFF position. There may be more than

1 disconnect switch. Lock out and tag switch with a suitable warning

label.

WARNING

EXPLOSION HAZARD

Failure to follow this warning could result in

personal injury or death.

Never use air or any gas containing oxygen for leak

testing or operating refrigerant compressors. Never

allow compressor suction pressure to operate in a

vacuum with service valves closed. See service

manual for pump-down instructions.

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The S4A5S Horizontal Air Conditioner with R-410A Refrigerant is a robust and efficient cooling system designed for residential and light commercial applications. This unit is intended to be installed by EPA-qualified personnel with appropriate certification, ensuring safe and proper operation. It is crucial to adhere to all safety considerations outlined in the manual to prevent potential hazards such as explosion, fire, electrical shock, personal injury, or property damage. This includes wearing safety glasses, protective clothing, and work gloves during installation and maintenance, as well as following all local and national safety codes.

Function Description

The S4A5S Horizontal Air Conditioner is designed to provide cooling by circulating R-410A refrigerant through a closed system. It works by absorbing heat from the indoor environment and releasing it outdoors, effectively lowering the indoor air temperature. The unit is optimized for operation with factory-approved indoor units and is factory-charged for a standard 15-foot (4.6m) lineset, with provisions for adjusting the charge based on actual lineset length.

The core function involves a compressor, which circulates the refrigerant, and a fan motor, which facilitates heat exchange across the coils. The system utilizes either a TXV (Thermostatic Expansion Valve) or an indoor piston for refrigerant metering, depending on the specific indoor unit combination. Charging procedures vary based on the metering device: the subcooling method is used for TXV systems, while the superheat method is applied for indoor piston systems.

The unit is designed to operate efficiently within a specified outdoor ambient temperature range, typically above 55°F (13°C) for cooling mode without accessories. For lower ambient cooling applications, specific accessories like a low-ambient pressure switch and a crankcase heater may be required to ensure proper function and prevent system damage.

Usage Features

The S4A5S air conditioner offers several features that enhance its usability and performance:

Flexible Installation: The unit can be mounted on a solid, level concrete pad or a rooftop platform. For rooftop installations, it should be elevated at least 6 inches (152 mm) above the roof surface and isolated from the structure to minimize vibration transmission. Clearance requirements are specified to ensure adequate airflow and service access, with different guidelines for coil-facing-wall and fan-facing-wall orientations, as well as for multi-unit installations.
Refrigerant Piping: The manual provides detailed instructions for connecting refrigerant tubes, emphasizing the use of refrigeration-grade tubing and proper brazing techniques. It highlights the importance of running tubes with no sharp bends, sealing wall openings, and avoiding direct contact with other structural elements to prevent noise and vibration. The installation of a liquid-line filter drier is mandatory to protect the system from contaminants and moisture.
Electrical Connections: The unit requires proper electrical connections in compliance with local and national codes. This includes connecting power wiring to the contactor and control wiring to the thermostat. The use of specific wire gauges is recommended to prevent excessive voltage drop, especially for longer runs. The unit cabinet must have an uninterrupted ground connection for safety.
Charging Procedures: The system's performance is optimized by ensuring the correct refrigerant charge. The manual provides comprehensive tables and procedures for checking the charge based on either subcooling (for TXV systems) or superheat (for indoor piston systems). These procedures require specific outdoor and indoor air temperature conditions to be met for accurate measurement.
Start-Up Sequence: A clear start-up sequence is provided, beginning with evacuating the system, fully opening service valves, and then energizing the electrical system. The thermostat is then set to initiate cooling operation, allowing the system to stabilize for at least 15 minutes before checking the refrigerant charge.
Accessory Compatibility: The unit is compatible with various accessories that can extend its operational capabilities, such as crankcase heaters for cold weather, start assist capacitors for the compressor, and low-ambient pressure switches for low-temperature cooling. The manual specifies which accessories are required for different application scenarios, including low-ambient cooling, long-line applications, and sea coast installations.

Maintenance Features

To ensure continued high performance, reliability, and safety, periodic maintenance is essential for the S4A5S air conditioner:

Regular Checks: The manual emphasizes the importance of routine checks, including verifying that all wiring is routed correctly and secured, and that service valve stem caps are tightened to the specified torque.
Refrigerant Circuit Repair: For repairs involving the refrigerant circuit, specific procedures must be followed to ensure safety and system integrity. This includes safely removing refrigerant using a certified recovery pump, purging the circuit with nitrogen gas, evacuating to a deep vacuum of 1500 microns, and then breaking the vacuum with a nitrogen purge before cutting or brazing. This meticulous process prevents contamination and ensures the system remains dry.
Filter Drier Replacement: The liquid-line filter drier is a critical component that protects the system from moisture and contaminants. While the unit comes with a factory-supplied filter drier, the manual instructs on its proper installation and replacement, highlighting the need to wrap it with a heat-sinking material during brazing.
Owner's Manual Guidance: The installer is instructed to leave the Owner's Manual with the customer and explain system operation and periodic maintenance requirements. This ensures that the end-user is aware of their responsibilities in maintaining the unit.
Professional Servicing: The manual implicitly promotes professional servicing by emphasizing that installation and major repairs should only be performed by EPA-qualified personnel. This ensures that complex tasks, such as refrigerant handling and electrical work, are conducted safely and correctly.
Component Integrity: The use of factory-authorized kits and accessories is stressed for any modifications or repairs. Using non-manufacturer-approved parts can invalidate the warranty and lead to equipment malfunction or failure, underscoring the importance of maintaining the system with genuine components.

By adhering to these installation, usage, and maintenance guidelines, the S4A5S Horizontal Air Conditioner with R-410A Refrigerant can provide reliable and efficient cooling for many years.

Carrier S4A5S Specifications

General

Refrigerant	R-410A
Voltage	208/230V
Energy Efficiency Ratio (EER)	Up to 12.5
Power Supply	60 Hz
Indoor Unit Dimensions (H x W x D)	Varies by model
Outdoor Unit Dimensions (H x W x D)	Varies by model
Indoor Unit Weight	Varies by model
Noise Level (Indoor Unit)	Varies by model
Noise Level (Outdoor Unit)	74 dB
Air Flow (Indoor Unit)	Varies by model