Daikin 4 Ton 14.3 SEER2 Heat Pump and Multi-Positional Air Handler System | 460V 3 Phase - R32 - Single Stage

Reliable Year-Round Comfort with a 4-Ton Commercial Split Heat Pump System for Ducted Applications

The Daikin DH4SEA4840 / AMST48CU1300 is a nominal 4-ton split heat pump system designed to provide year-round heating and cooling for suitable ducted applications. Combining the DH4SEA4840 outdoor heat pump with the AMST48CU1300 multi-position indoor air handler, this system features a high-efficiency Copeland scroll compressor, R-32 refrigerant, and a nine-speed electronically commutated motor (ECM) blower. The outdoor unit operates on 460V, three-phase power, while the indoor air handler uses a separate 208/230V, single-phase power supply. This configuration offers flexible indoor air distribution and installation options for appropriately sized commercial and light commercial spaces.

Key Benefits

• Energy-Efficient Performance – The DH4SEA4840 belongs to Daikin's DH4SEA commercial heat pump series, which offers efficiency ratings of up to 14.3 SEER2, 12.5 EER2, and 7.5 HSPF2, depending on the model and approved system configuration.
• Year-Round Heat Pump Heating – Reversible heat pump technology provides heating and cooling through one outdoor unit, helping reduce the need for separate primary heating and cooling equipment.
• 4-Ton Nominal Capacity – The DH4SEA4840 provides nominal 48,000 BTU/h heating and cooling capacity for appropriately sized applications.
• Nine-Speed ECM Blower – The AMST48CU1300 features a direct-drive, nine-speed ECM blower motor that provides multiple airflow settings for ducted applications.
• Flexible Installation – The multi-position indoor air handler supports approved installation orientations to accommodate different equipment layouts.
• Ducted Air Distribution – The indoor air handler connects to compatible ductwork to distribute conditioned air throughout the served space.
• Copeland Scroll Compressor – The outdoor heat pump incorporates scroll compressor technology and Copeland CoreSense technology to support dependable operation and compressor protection.
• Refrigerant Flow Control – The indoor air handler's factory-installed thermal expansion valve (TXV) helps regulate refrigerant flow during system operation.
• Service-Friendly Design – Accessible outdoor refrigerant service valves, gauge ports, and integrated pressure switches help facilitate inspection and maintenance.

Heat Pump Heating for Year-Round Comfort

The Daikin DH4SEA4840 provides nominal 48,000 BTU/h heating capacity under the manufacturer's specified rating conditions. Its single-stage Copeland scroll compressor supports reversible heat pump operation, transferring heat into the indoor space during heating mode. The DH4SEA commercial heat pump series is designed to provide heating performance across a range of outdoor temperatures, with actual capacity depending on outdoor conditions and the matched indoor equipment. Supplemental electric heat may be provided through a compatible field-installed heater kit for the AMST48CU1300 where required. Heater-kit compatibility, required airflow, electrical requirements, and auxiliary heat controls must be verified against the applicable Daikin installation documentation.

4-Ton Cooling Performance for Commercial Comfort

The DH4SEA4840 outdoor heat pump provides nominal 48,000 BTU/h cooling capacity, equivalent to 4 tons. Its Copeland scroll compressor and enhanced aluminum fin coil with 7 mm diameter copper tubing are designed to support heat transfer and dependable cooling operation. The DH4SEA series offers efficiency ratings of up to 14.3 SEER2 and 12.5 EER2, depending on the specific model and matched equipment combination. Actual cooling capacity and efficiency for the DH4SEA4840 / AMST48CU1300 system depend on indoor airflow, installation conditions, refrigerant charge, and operating environment. Refer to the applicable Daikin matched-system performance data for certified ratings.

Energy Efficiency and Refrigeration Technology

The DH4SEA4840 incorporates a high-efficiency Copeland scroll compressor and advanced CoreSense technology. Standard outdoor-unit components include a factory-installed bi-flow liquid-line filter drier, suction-line accumulator, compressor crankcase heater, high-capacity muffler, and high- and low-pressure switches. Time-delay technology supports reliable defrost operation during heating. The outdoor unit uses R-32 refrigerant and is factory charged for 15 feet of refrigerant tubing, with additional charge adjustments determined according to actual piping length and the manufacturer's installation instructions. The AMST48CU1300 complements the outdoor unit with a factory-installed TXV, an all-aluminum evaporator coil with high-performance coated fin stock, and a direct-drive, nine-speed ECM blower motor. Together, these components support refrigerant management, heat transfer, and flexible indoor airflow.

Split-System Design for Flexible Installation

The split-system configuration separates the DH4SEA4840 outdoor heat pump from the AMST48CU1300 indoor air handler, providing flexibility in equipment placement and duct routing. The outdoor unit features sweat-connection refrigerant service valves with accessible gauge ports, a 3/8-inch liquid-line connection, and a 1-1/8-inch suction-line connection. The unit is factory charged for 15 feet of refrigerant tubing, with additional refrigerant charge determined according to the installation instructions and actual piping length. The AMST48CU1300 features a multi-position cabinet, a nominal 4-ton capacity, and an all-aluminum evaporator coil. Refrigerant piping, TXV selection, electrical connections, installation clearances, and equipment matching must comply with the applicable Daikin installation instructions.

Controls and Indoor Comfort

The system requires compatible heat pump controls and a suitable thermostat selected for the approved equipment configuration. The AMST48CU1300 features a direct-drive, nine-speed ECM blower motor that provides multiple airflow settings for ducted air distribution. Its factory-installed TXV regulates refrigerant flow, while the all-aluminum evaporator coil supports heat transfer during cooling and heat pump operation. Compatible field-installed electric heat kits may provide supplemental heating where required. Thermostat selection, blower settings, auxiliary heat operation, heater-kit compatibility, and system wiring must be verified against the manufacturer's instructions for the installed equipment.

Commercial and Ducted Applications

The Daikin DH4SEA4840 / AMST48CU1300 is designed for nominal 4-ton heating and cooling applications where the required capacity, ductwork, electrical supply, and approved equipment configuration meet project requirements. Potential applications include small offices, retail spaces, and other suitable commercial or light commercial areas. The DH4SEA4840 operates on 460V, 60 Hz, three-phase power, with a minimum circuit ampacity of 8.0 A and a maximum overcurrent protection rating of 10 A. The AMST48CU1300 uses a separate 208/230V, single-phase electrical supply. Each unit must be connected according to its own nameplate and installation instructions. Proper system sizing, duct design, airflow configuration, and installation by qualified HVAC professionals are essential for dependable operation.

Serviceability and Maintenance

The DH4SEA4840 includes refrigerant service valves with accessible gauge ports, high- and low-pressure switches, a factory-installed liquid-line filter drier, and a suction-line accumulator to support refrigeration-system protection and servicing. Its compressor crankcase heater and time-delay defrost technology provide additional operational safeguards. The outdoor cabinet features a removable grille-style top, a rust-resistant steel louvered coil guard, and top and side maintenance access, with single-panel access to controls. The AMST48CU1300 features a factory-installed TXV and an all-aluminum evaporator coil. Routine maintenance should include inspection and cleaning of air filters and coils, condensate drainage checks, inspection of electrical connections, and refrigerant-system checks by qualified HVAC personnel in accordance with Daikin's maintenance recommendations.

Warranty

The Daikin DH4SEA commercial heat pump series includes a 5-Year Parts Limited Warranty under the applicable warranty terms. The AMST R-32 air handler series offers a 12-Year Parts Limited Warranty when the applicable online registration requirements are satisfied within 60 days of installation. Warranty eligibility, registration conditions, coverage duration, and exclusions depend on the specific product and applicable warranty certificate. Confirm the applicable warranty coverage for both models and verify the approved equipment combination before purchase and installation. Refer to Daikin's official warranty documentation for complete terms and conditions.

Recommended Accessories

• Compatible Heat Pump Thermostat – Select a thermostat approved for the verified heat pump and indoor air handler configuration.
• Compatible Electric Heat Kit – Select a heater kit specifically approved for the AMST48CU1300 if supplemental electric heating is required.
• Outdoor Equipment Pad or Mounting Support – Choose a support suitable for the outdoor unit's dimensions, weight, and installation location.
• Electrical Disconnect and Overcurrent Protection – Select components according to each unit's nameplate, installation instructions, and applicable electrical codes.
• Refrigerant Line Set and Duct Transitions – Size and select components according to the approved equipment combination, refrigerant piping requirements, and site-specific duct design.

Dependable Heating and Cooling with the Daikin DH4SEA4840 / AMST48CU1300

Support year-round indoor comfort with the Daikin DH4SEA4840 / AMST48CU1300 split heat pump system. Combining nominal 4-ton outdoor heat pump capacity, Copeland scroll compressor technology, R-32 refrigerant, and a multi-position indoor air handler with nine-speed ECM airflow, this system offers a flexible ducted heating and cooling solution for suitable commercial applications.