Complete Central Ducted Heat Pump Solution

A central ducted heat pump combines heating, cooling, air handling and central air distribution into one coordinated HVAC system.

Unlike independent room air conditioners, conditioned air is distributed throughout the building through a properly designed supply and return duct network, helping provide more consistent temperatures, balanced airflow and centralized indoor comfort management.

A complete YUJU central ducted HVAC solution can be configured around:

• R454B inverter outdoor heat pump
• Matched ECM ducted air handler
• Supply and return duct system
• Room thermostats and temperature controllers
• Motorized or modulating zoning dampers
• YUJU Air Basic™ smart zoning control
• YUJU AIRFORM™ airflow and duct engineering
• Fresh-air ventilation
• Humidity management
• Whole-house filtration and air purification
• OEM and private-label customization

Why R454B Is Becoming Important in Modern HVAC Systems

R454B is a lower-global-warming-potential refrigerant used in a new generation of residential and light commercial air-conditioning and heat-pump equipment.

It is one of the refrigerant platforms being adopted as the HVAC industry transitions away from traditional higher-GWP refrigerants such as R410A.

R454B vs. Existing R410A Systems

R454B equipment should not automatically be treated as a direct component-by-component replacement for an existing R410A HVAC system.

For replacement or retrofit projects, contractors should review the complete system, including:

• Outdoor heat pump compatibility
• Indoor air handler or evaporator coil compatibility
• Metering device and refrigerant circuit design
• Existing refrigerant piping
• Electrical supply and protection
• Thermostat and control compatibility
• Existing duct airflow
• External static pressure
• Applicable installation and safety requirements

In many replacement projects, an existing duct network may be reusable if its airflow capacity, duct condition, leakage and static pressure are suitable.

The refrigerant circuit and matched HVAC components, however, must be evaluated according to the selected equipment requirements.

A2L Refrigerant Safety and System Design

R454B is classified as an A2L refrigerant. Equipment, installation procedures and safety controls must therefore be designed for the characteristics of the refrigerant and applicable destination-market requirements.

Depending on equipment configuration, refrigerant charge, installation conditions and applicable requirements, the system may incorporate refrigerant detection and mitigation functions.

High-Efficiency Inverter Heat Pump Technology

The outdoor heat pump uses DC inverter compressor technology to adjust system output according to actual heating and cooling demand.

Compared with conventional fixed-capacity operation, inverter technology can provide:

• Improved part-load efficiency
• More stable indoor temperatures
• Reduced compressor cycling
• Quieter operation
• Better seasonal energy performance
• More flexible capacity control

Selected system configurations can achieve efficiency ratings up to 18 SEER2.

Matched Outdoor Heat Pump and Indoor Air Handler

Correct matching between the outdoor heat pump and indoor air handler is essential for capacity, efficiency, airflow, refrigerant control and reliable operation.

YUJU can configure matched systems according to:

• Required cooling and heating capacity
• Airflow requirements
• External static pressure
• Electrical supply
• Refrigerant platform
• Installation orientation
• Control requirements
• Target-market documentation

Outdoor Inverter Heat Pump

The outdoor unit provides cooling and heating through a reversible refrigeration cycle. Inverter compressor control allows the system to respond more closely to changing building loads.

ECM Residential Air Handler

The indoor air handler uses ECM blower technology to distribute conditioned air through the duct system while providing flexible airflow adjustment for different duct and zoning requirements.

Depending on the selected model, air-handler installation may support upflow, downflow or horizontal configuration.

AHRI Matching and Certification Documentation

For projects requiring certified system performance, outdoor and indoor equipment should be evaluated as a matched combination rather than as independent components.

Available AHRI or other applicable certification documentation can be provided or coordinated for selected system configurations where required.

3 Ton, 4 Ton and 5 Ton System Options

System Capacity	Typical Application
3 Ton	Residential and smaller central ducted HVAC applications
4 Ton	Medium-size residential and light commercial applications
5 Ton	Larger residential and light commercial ducted HVAC systems

Nominal tonnage is only a preliminary capacity classification. Final equipment selection should be based on building load calculations, climate, airflow, duct resistance, ventilation and actual project conditions.

Key Technical Configuration

Item	Configuration
Refrigerant	R454B Low-GWP Refrigerant
Capacity Range	3 Ton / 4 Ton / 5 Ton
Compressor	DC Inverter Compressor
Efficiency	Up to 18 SEER2, depending on selected configuration
Indoor Blower	ECM Variable-Speed Blower
System Type	Central Ducted Heat Pump
Air Handler Installation	Upflow / Downflow / Horizontal, depending on model
Control	Thermostat / Smart Control / Zoning Integration
Application	Residential & Light Commercial HVAC

Airflow, Duct Design and External Static Pressure

A ducted heat pump should not be selected by nominal tonnage alone.

The indoor air handler must provide sufficient airflow against the resistance created by the actual duct system and installed components.

Engineering review should consider:

• Required room-by-room airflow
• Main and branch duct sizing
• Duct velocity
• Supply and return-air pressure loss
• Filters and air-cleaning devices
• Motorized zoning dampers
• Diffuser and grille pressure drop
• Fresh-air accessories
• Total external static pressure

YUJU AIRFORM™ Duct & Air Distribution Engineering

Correct duct design is essential for the real-world performance of a central ducted heat pump. YUJU AIRFORM™ supports room-by-room HVAC engineering for ducted and all-air systems.

The engineering workflow can evaluate:

• Room-by-room cooling and heating load
• Required room airflow
• Main and branch duct sizing
• Duct velocity
• Supply diffuser sizing and quantity
• Return-air requirements
• External static pressure
• Room-by-room zoning airflow
• Preliminary HVAC equipment capacity matching

This engineering approach helps HVAC contractors and project customers move beyond simple tonnage selection and evaluate how the complete air-distribution system will actually perform in the building.

R454B Heat Pump Replacement and Retrofit Projects

R454B ducted heat pumps can be considered for new construction as well as replacement of aging central HVAC equipment, subject to proper engineering review.

Before replacing an existing system, contractors should confirm:

• Existing equipment capacity and model information
• Supply and return airflow direction
• Existing duct dimensions and condition
• Available external static pressure
• Electrical supply
• Indoor and outdoor installation space
• Refrigerant piping requirements
• Thermostat and zoning requirements

For retrofit projects, YUJU can help evaluate whether an existing duct network is suitable for the new equipment or whether modifications should be considered.

Whole-House Indoor Comfort Integration

The central air handler can become the air-distribution platform for more than heating and cooling.

Optional integration can include:

• Fresh Air Ventilation
• Whole-House Dehumidification
• Humidification
• High-Efficiency Air Filtration
• Electronic Air Cleaning
• UV-C Air Treatment
• Indoor Air Quality Sensors
• Smart HVAC Zoning

This allows heating, cooling, ventilation, humidity management and indoor-air-quality functions to operate through one coordinated ducted HVAC platform.

Smart Room-by-Room Zoning Control

YUJU ducted HVAC systems can be integrated with independent room thermostats, temperature sensors, motorized or modulating dampers and a central zoning controller.

A properly designed zoning system can provide:

• Independent room or zone temperature control
• Automatic airflow adjustment
• Reduced airflow to satisfied zones
• Improved comfort between different rooms
• Reduced unnecessary conditioning
• Improved whole-house airflow management
• Better part-load operation

YUJU Air Basic™ Variable Air Volume Smart Zoning

YUJU Air Basic™ is YUJU's room-by-room variable-air-volume zoning solution for central ducted HVAC systems.

The system can combine room controllers, motorized or modulating dampers, EC fan airflow adjustment and central return-air temperature feedback to improve comfort and reduce unnecessary conditioning in satisfied zones.

• Independent room temperature control
• Motorized / modulating zone dampers
• Variable airflow according to zone demand
• EC fan speed coordination
• Minimum-airflow protection
• Duct static-pressure management
• Central return-air temperature feedback
• Integration with compatible ducted inverter HVAC systems

How Zoning Works with an Inverter Heat Pump

When a room approaches its temperature setpoint, the associated motorized damper can reduce airflow to that zone.

As multiple zones reduce their airflow demand, an ECM indoor fan can reduce total system airflow or maintain a controlled duct static pressure.

The inverter heat pump can then reduce cooling or heating output according to its own control logic, typically using central return-air temperature, coil conditions and system operating data to determine the required compressor capacity.

This allows the zoning system to manage room airflow while the matched inverter HVAC system manages refrigeration capacity according to actual return-air and operating conditions.

For reliable zoning performance, the design must also protect:

• Minimum indoor-unit airflow
• Acceptable duct static pressure
• Minimum zone airflow where required
• Adequate return-air paths

Return-Air Design for Zoned Systems

Where practical, dedicated active return-air paths can be provided from occupied rooms.

Where individual return ducts are not practical, transfer grilles, jump ducts or other connected return-air paths can allow air to return to a central return grille or return plenum.

This is especially important for bedrooms and other rooms that may operate with closed doors.

Applications

YUJU R454B central ducted heat pump systems can be configured for a wide range of residential and light commercial applications.

• Single-Family Homes
• Luxury Villas
• Townhouses
• Apartments and Condominiums
• Multi-Family Residential Buildings
• Hotels and Serviced Apartments
• Offices
• Clinics
• Schools
• Light Commercial Buildings

OEM & Private Label R454B HVAC Solutions

YUJU EnvironTech supports HVAC distributors, importers and private-label brands requiring customized central ducted heat pump products for their local markets.

OEM customization can include:

• Private-label branding
• Outdoor unit and air-handler matching
• Customized product specifications
• Cabinet and appearance options
• Voltage and frequency configuration
• Refrigerant-platform configuration
• Control-system options
• Product labels and documentation
• Customized packaging
• Project-based product configuration

YUJU can support complete matched systems as well as project-specific HVAC equipment configurations for qualified OEM and distribution partners.

What Contractors and Buyers Should Provide

Providing correct project information allows faster and more accurate equipment selection.

Information	Why It Matters
Required Capacity	Initial 3 / 4 / 5 Ton system selection
Project Location	Climate, application and market requirements
Voltage / Phase / Frequency	Electrical configuration and equipment matching
Existing HVAC Model	Useful for replacement and retrofit projects
Duct Information	Airflow and external-static-pressure review
Airflow Direction	Upflow / downflow / horizontal configuration
Zoning Requirement	Thermostat, damper and variable-airflow design
OEM Requirement	Branding, labels, packaging and documentation

YUJU Engineering Support

Selecting a central ducted heat pump requires more than choosing nominal tonnage.

YUJU can support:

• Cooling and heating load review
• Outdoor and indoor unit matching
• Room-by-room airflow calculation
• External static pressure evaluation
• YUJU AIRFORM™ duct and air-distribution engineering
• Duct sizing and diffuser coordination
• Electrical specification review
• Fresh-air integration
• Humidity-control integration
• YUJU Air Basic™ room-by-room smart zoning
• OEM documentation and technical submittals

Why Choose YUJU R454B Central Ducted Heat Pumps

• R454B lower-GWP refrigerant platform
• 3 Ton, 4 Ton and 5 Ton system options
• Selected configurations up to 18 SEER2
• DC inverter compressor technology
• ECM variable-speed air handler
• Whole-house central duct distribution
• YUJU AIRFORM™ room-by-room duct and airflow engineering
• Airflow and external-static-pressure evaluation
• YUJU Air Basic™ variable-air-volume smart zoning
• Fresh-air and IAQ integration
• OEM and private-label support
• Project-based equipment matching
• International HVAC engineering support

YUJU EnvironTech combines HVAC equipment, air handling, air-distribution engineering and intelligent controls to provide flexible central HVAC solutions for distributors, contractors and project customers.

Frequently Asked Questions

What is R454B refrigerant?

R454B is a lower-GWP A2L refrigerant used in a new generation of residential and light commercial air-conditioning and heat-pump equipment.

Is R454B replacing R410A?

R454B is one of the lower-GWP refrigerants being adopted as HVAC equipment transitions away from higher-GWP refrigerant platforms such as R410A. The refrigerant used depends on equipment design, manufacturer and destination-market requirements.

Is R454B an A2L refrigerant?

Yes. R454B is classified as A2L. Equipment and installation procedures must therefore follow applicable product safety requirements, manufacturer instructions and local requirements.

Does an R454B HVAC system require a refrigerant leak sensor?

Leak detection or mitigation requirements depend on equipment design, refrigerant charge, application and applicable requirements. The exact requirement should be verified from the selected product documentation.

What capacities are available?

Standard YUJU configurations include 3 Ton, 4 Ton and 5 Ton central ducted heat pump systems.

Can the heat pump and air handler be supplied as a matched system?

Yes. YUJU can provide matched outdoor heat pump and indoor air-handler configurations based on capacity, airflow, electrical and project requirements.

Why is outdoor-unit and air-handler matching important?

The outdoor unit, air handler, coil, refrigerant circuit, airflow and controls work as one HVAC system. Correct matching is important for capacity, efficiency and reliable operation.

Can an R454B system use an existing R410A air handler?

Compatibility should not be assumed. The indoor air handler, evaporator coil, metering device, refrigerant circuit and controls should be compatible with the selected R454B outdoor equipment.

Can existing ductwork be reused?

Potentially yes. Existing ductwork can be evaluated for airflow capacity, leakage, dimensions, external static pressure and physical condition before reuse.

How much airflow does a ducted heat pump require?

Approximately 400 CFM per ton is commonly used as an initial reference, but final airflow should be selected from equipment blower data and actual cooling, humidity and duct-system requirements.

Why is external static pressure important?

Filters, ducts, fittings, dampers and diffusers create resistance to airflow. The air handler must provide the required airflow against the total external resistance of the installed duct system.

What is YUJU AIRFORM™?

YUJU AIRFORM™ is YUJU's HVAC engineering approach and design tool for room-by-room load, airflow, duct sizing, static-pressure, diffuser, return-air and zoning calculations for ducted HVAC systems.

Can YUJU help design the duct system?

Yes. YUJU can support room-by-room airflow calculation, main and branch duct sizing, duct velocity, external static pressure, diffuser selection and return-air design for project-based HVAC applications.

Can the system work with smart thermostats and zoning controls?

Yes. Smart thermostat and zoning integration can be configured according to the selected equipment, control interface and project requirements.

What is YUJU Air Basic™?

YUJU Air Basic™ is YUJU's room-by-room variable-air-volume smart zoning solution for central ducted HVAC systems, combining room controllers, motorized or modulating dampers and variable airflow management.

How does an inverter heat pump reduce capacity when zones close?

The zoning system can reduce airflow to satisfied rooms while the ECM indoor fan reduces total airflow. The inverter HVAC system can then adjust refrigeration capacity according to central return-air temperature, coil conditions and its internal control logic.

What happens when only one small zone requires cooling?

The system must maintain the minimum airflow required by the indoor unit while controlling duct static pressure. Proper damper modulation, EC fan control, minimum-airflow protection and return-air design are therefore important in multi-zone applications.

Does every room need a dedicated return duct?

Dedicated active return air can be used where practical. Where an individual return duct is difficult, transfer grilles, jump ducts or connected return-air paths can be designed to allow air to reach a central return grille or return plenum.

Can YUJU provide AHRI or ETL documentation?

Available certification and technical documentation can be provided or coordinated according to the selected equipment configuration and destination-market requirements.

Does YUJU provide OEM and private-label services?

Yes. YUJU supports OEM and private-label projects including branding, product configuration, documentation, packaging and project-based customization.

What information should I provide for a quotation?

Please provide required capacity, project location, voltage and frequency, installation configuration, existing equipment information if applicable, duct details, zoning requirements and expected quantity.

Can YUJU support a complete HVAC project instead of equipment only?

Yes. Depending on the project, YUJU can support equipment matching, AIRFORM™ airflow and duct engineering, Air Basic™ smart zoning, fresh-air and IAQ integration, OEM customization and technical documentation.

Contact YUJU for R454B Ducted Heat Pump Solutions

Looking for an R454B central ducted heat pump supplier, matched heat pump and air-handler system, replacement HVAC solution, smart zoning system or OEM/private-label partner?

Send YUJU your required capacity, electrical specifications, project location, installation conditions, duct information and target-market requirements.

Our team can support equipment selection, system matching, AIRFORM™ duct engineering, Air Basic™ smart zoning, OEM customization and project technical documentation.