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

Reliable Year-Round Comfort with a 3-Ton Commercial Split Heat Pump System for Ducted Applications

The Daikin DH4SEA3640 / AMST36CU1300 is a nominal 3-ton split heat pump system designed to provide year-round heating and cooling for suitable ducted applications. Combining the DH4SEA3640 outdoor heat pump with the AMST36CU1300 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 to support dependable comfort and flexible installation. The outdoor unit operates on 460V, three-phase power, while the indoor air handler operates on 208/230V, single-phase power. Confirm electrical compatibility, approved equipment matching, and applicable installation requirements before selecting this combination.

Key Benefits

• Energy-Efficient Performance – The DH4SEA3640 offers rated efficiencies of 14.3 SEER2, 12.5 EER2, and 7.5 HSPF2 to support efficient heating and cooling operation.
• Year-Round Heat Pump Heating – Reversible heat pump technology provides both heating and cooling through one outdoor unit, reducing the need for separate primary heating and cooling equipment.
• Dependable Cooling Capacity – The outdoor unit delivers a nominal 36,000 BTU/h cooling capacity, equivalent to 3 tons, for appropriately sized applications.
• Nine-Speed ECM Blower – The AMST36CU1300 features a direct-drive, nine-speed ECM motor that provides multiple airflow settings to accommodate system requirements.
• Flexible Installation – The multi-position air handler supports approved horizontal and vertical configurations for adaptable equipment placement.
• Ducted Air Distribution – The indoor air handler connects to compatible ductwork to distribute conditioned air throughout the served space.
• Advanced Compressor Technology – The Copeland scroll compressor and CoreSense technology support dependable operation and compressor protection.
• Refrigerant Flow Control – The air handler's factory-installed thermal expansion valve (TXV) regulates refrigerant flow during heating and cooling operation.
• Service-Friendly Components – Accessible outdoor service valves, gauge ports, and integrated pressure protection features help facilitate inspection and maintenance.

Reliable Heat Pump Heating for Year-Round Comfort

The Daikin DH4SEA3640 provides nominal 36,000 BTU/h heating capacity, with a rated heating capacity of 36,000 BTU/h under specified test conditions. Its single-stage Copeland scroll compressor supports reversible heat pump operation, transferring heat into the indoor space during heating mode. The DH4SEA3640 has a rated HSPF2 of 7.5, supporting efficient heating operation under appropriate conditions. The specified outdoor heating operating range is -20°F to 70°F, subject to the manufacturer's operating requirements and installation conditions. Supplemental electric heat may be available through a compatible field-installed heater kit for the AMST36CU1300 where required. Heater selection, electrical connections, and auxiliary heat controls must follow the applicable manufacturer documentation.

3-Ton Cooling Performance for Commercial Comfort

The DH4SEA3640 outdoor heat pump delivers a nominal cooling capacity of 36,000 BTU/h, equivalent to 3 tons, with a rated cooling capacity of 36,000 BTU/h under the manufacturer's specified test conditions. Its single-stage Copeland scroll compressor and enhanced aluminum fin coil with 5 mm diameter copper tubing are designed to support heat transfer and dependable cooling operation. The model has rated efficiencies of 14.3 SEER2 and 12.5 EER2. Its specified cooling operating range is 55°F to 125°F outdoor dry-bulb temperature. Actual system performance depends on the matched indoor equipment, installation conditions, airflow, refrigerant charge, and operating environment.

Energy Efficiency and Refrigeration Technology

The DH4SEA3640 combines a high-efficiency Copeland scroll compressor with CoreSense technology and refrigeration-system components designed to support dependable operation. Factory-installed components include a 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 required according to the installation instructions and actual piping length. The AMST36CU1300 complements the system with a factory-installed TXV, an all-aluminum evaporator coil with high-performance coated fin stock, and a nine-speed ECM blower motor. The outdoor unit's published efficiency ratings are 14.3 SEER2, 12.5 EER2, and 7.5 HSPF2; certified ratings for the complete matched equipment combination should be confirmed separately.

Split-System Design for Flexible Installation

The split-system configuration separates the DH4SEA3640 outdoor heat pump from the AMST36CU1300 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 7/8-inch suction-line connection. The factory refrigerant charge accommodates 15 feet of tubing, with charge adjustments determined by the installation instructions. The AMST36CU1300 features a multi-position cabinet designed for approved horizontal and vertical installations, an all-aluminum evaporator coil, and a factory-installed R-32 refrigerant sensor. The indoor unit is designed for ducted applications and includes a repositionable coil mounting track to facilitate approved installation configurations. Refrigerant piping, electrical connections, installation clearances, and equipment matching must comply with Daikin's applicable installation instructions. Particular attention should be given to the outdoor unit's 460V three-phase supply and the indoor unit's 208/230V single-phase supply.

Controls and Indoor Comfort

The system requires compatible heat pump controls and a suitable thermostat selected for the approved equipment configuration. The AMST36CU1300 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 are available for supplemental heating, subject to approved heater-kit compatibility and electrical requirements. Thermostat selection, auxiliary heat operation, blower settings, and system wiring must be verified against the manufacturer's instructions for the exact installation.

Commercial and Ducted Applications

The Daikin DH4SEA3640 / AMST36CU1300 combination offers nominal 3-ton heating and cooling capacity for appropriately sized ducted spaces. Potential applications include small offices, retail areas, and other suitable conditioned spaces where the required capacity, electrical supply, ductwork, and equipment configuration meet project requirements. The DH4SEA3640 operates on 460V, 60 Hz, three-phase power and has a minimum circuit ampacity of 6.7 A and a maximum overcurrent protection rating of 10 A. The AMST36CU1300 operates on 208/230V, single-phase power. Separate electrical requirements apply to each unit, and the supply voltage must match the equipment nameplate. Because the outdoor unit's 460V supply differs from the indoor unit's 208/230V supply, confirm that the proposed pairing is approved for the intended application and that the installation provides the correct electrical supplies.

Serviceability and Maintenance

The DH4SEA3640 includes 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 AMST36CU1300 features a repositionable coil mounting track, a factory-installed TXV, and an R-32 refrigerant sensor designed for the service life of the coil. Routine maintenance should include inspection and cleaning of air filters and coils, condensate drainage checks, inspection of electrical connections, and verification of refrigerant-system operation by qualified 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 commercial warranty terms. The AMST (R-32) air handler series includes a 12-Year Parts Limited Warranty when the applicable online registration requirements are satisfied within 60 days of installation. Warranty eligibility, registration requirements, coverage conditions, and exclusions depend on the specific equipment and applicable warranty documentation. Confirm the applicable warranty terms for both models and verify that the proposed equipment combination meets manufacturer requirements before purchase and installation. Refer to the official Daikin warranty documentation for complete coverage details.

Recommended Accessories

• Compatible Heat Pump Thermostat – Select a thermostat approved for the installed heat pump and indoor air handler configuration.
• Compatible Electric Heat Kit – Select an approved field-installed heater kit for the AMST36CU1300 if supplemental electric heating is required.
• Outdoor Equipment Pad or Mounting Support – Select 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 DH4SEA3640 / AMST36CU1300

Support year-round indoor comfort with the Daikin DH4SEA3640 / AMST36CU1300 split heat pump system. Combining nominal 3-ton heat pump capacity, a single-stage Copeland scroll compressor, 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 when equipment compatibility, electrical requirements, and matched-system performance have been verified for the intended application.