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 Light Commercial Applications

The Daikin DH4SEA3640 / AMST36BU1300 is a 3-ton split heat pump system designed to provide year-round heating and cooling for light commercial and suitable ducted applications. Combining the 36,000 BTU/h DH4SEA3640 outdoor heat pump with the AMST36BU1300 multi-position indoor air handler, this system integrates dependable heat pump technology with flexible installation options, efficient air circulation, and service-friendly components to support comfortable indoor environments.

Key Benefits

• Energy-Efficient Performance – The DH4SEA series offers efficiency ratings of up to 14.3 SEER2, 12.5 EER2, and 7.5 HSPF2, helping support efficient heating and cooling operation. Actual system ratings depend on the matched equipment combination.
• Heat Pump Heating – Reversible heat pump operation provides both heating and cooling from one outdoor system, helping reduce the need for separate primary heating and cooling equipment.
• Reliable Cooling Performance – The nominal 36,000 BTU/h outdoor unit provides 3-ton cooling capacity for appropriately sized applications.
• Multi-Speed Indoor Airflow – The AMST36BU1300 features a direct-drive, nine-speed electronically commutated motor (ECM) to support flexible airflow operation.
• Flexible Installation – The multi-position indoor air handler supports approved vertical and horizontal installation configurations, allowing greater flexibility in equipment placement.
• Ducted System Design – The indoor air handler circulates conditioned air through connected ductwork to serve multiple areas within a building.
• Durable Outdoor Components – The DH4SEA outdoor unit incorporates a high-efficiency Copeland scroll compressor and an enhanced coil design to support dependable operation.
• Thermostatic Refrigerant Control – The air handler's factory-installed thermal expansion valve (TXV) regulates refrigerant flow to support heating and cooling performance.
• Service-Friendly Design – Outdoor service valves with accessible gauge ports and built-in refrigeration-system protection features help facilitate inspection and maintenance.

Reliable Heat Pump Heating for Year-Round Comfort

The Daikin DH4SEA3640 provides a nominal heating capacity of 36,000 BTU/h using a high-efficiency Copeland scroll compressor. Reversible heat pump operation allows the system to transfer heat into the indoor space during heating operation, providing an alternative to conventional electric resistance heating as the primary heat source. The DH4SEA series offers HSPF2 ratings of up to 7.5, although actual heating efficiency depends on the complete matched system and operating conditions. Supplemental electric heat may be available through a compatible, separately selected field-installed air handler heater kit, subject to approved equipment compatibility and electrical requirements.

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. Its high-efficiency Copeland scroll compressor and enhanced aluminum fin coil with 5 mm diameter copper tubing are designed to support dependable heat transfer and cooling operation. The DH4SEA series offers ratings of up to 14.3 SEER2 and 12.5 EER2. Actual efficiency ratings for the DH4SEA3640 and AMST36BU1300 combination must be confirmed through the applicable matched-system performance documentation.

Energy Efficiency and Refrigeration Technology

The DH4SEA series combines a high-efficiency scroll compressor with refrigeration-system components designed to support reliable heating and cooling operation. The outdoor unit includes 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 controlled defrost operation. The AMST36BU1300 complements the outdoor unit with a factory-installed TXV and a nine-speed ECM blower motor. Together, these features support controlled refrigerant flow, dependable operation, and flexible indoor airflow. The DH4SEA series efficiency ratings are product-family maximums and should not be interpreted as verified ratings for this exact equipment combination.

Split-System Design for Flexible Installation

The split-system configuration places the DH4SEA3640 outdoor heat pump separately from the AMST36BU1300 indoor air handler, providing flexibility in equipment placement and duct routing. The outdoor unit uses sweat-connection refrigerant service valves with accessible gauge ports and is factory charged for 15 feet of refrigerant tubing. The specified indoor air handler features a 17.5-inch cabinet width and supports approved multi-position installation configurations. The AMST36BU1300 is designed for R-32 refrigerant and includes an all-aluminum evaporator coil with high-performance coated fin stock. Refrigerant piping, electrical connections, installation clearances, and equipment matching must follow the applicable Daikin documentation.

Controls and Indoor Comfort

The system operates through compatible heat pump controls and a suitable thermostat selected for the installed equipment configuration. The AMST36BU1300 features a direct-drive, nine-speed ECM blower motor to provide multiple airflow settings. Its factory-installed TXV supports refrigerant flow control during cooling and heat pump operation. Compatible supplemental electric heat kits may be field installed where required and approved. Thermostat selection, auxiliary heat control, and system wiring must be verified against the manufacturer's installation instructions for both equipment models.

Applications for Light Commercial and Ducted Spaces

The Daikin DH4SEA3640 / AMST36BU1300 combination provides 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 system's capacity, electrical configuration, ductwork, and approved equipment combination meet project requirements. The DH4SEA3640 is a 460V three-phase commercial outdoor heat pump, while the AMST36BU1300 is a 208/230 V, single-phase indoor air handler. Equipment selection should account for these electrical requirements and confirm the suitability of the matched system for the intended application.

Serviceability and Maintenance

The DH4SEA3640 incorporates 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 factory-installed crankcase heater and time-delay defrost technology provide additional operational safeguards. The AMST36BU1300 includes a repositionable coil mounting track and a cabinet designed for multi-position installation. Regular maintenance should include inspection of air filters, indoor and outdoor coils, condensate drainage, refrigerant connections, and electrical components in accordance with Daikin's maintenance recommendations.

Warranty

The DH4SEA commercial heat pump series carries a 5-Year Parts Limited Warranty under the applicable commercial warranty terms. The AMST R-32 air handler series carries a 12-Year Parts Limited Warranty when the applicable registration requirements are satisfied. Warranty eligibility, registration deadlines, coverage conditions, and exclusions depend on the specific equipment and installation. Because this system combines commercial outdoor equipment with an indoor air handler from a different product category, the applicable warranty terms for both models should be confirmed 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.
• Electric Heat Kit – Select an approved AMST-compatible field-installed heater kit if supplemental electric heating is required.
• Outdoor Equipment Pad or Mounting Support – Select a support suitable for the installation location, equipment dimensions, and applicable installation requirements.
• Electrical Disconnect and Overcurrent Protection – Select components in accordance with the equipment 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 / AMST36BU1300

Support year-round indoor comfort with the Daikin DH4SEA3640 / AMST36BU1300 split heat pump system. Combining nominal 3-ton heat pump capacity, a high-efficiency scroll compressor, and a multi-position indoor air handler with nine-speed ECM airflow, this system offers a flexible ducted heating and cooling solution when the equipment combination is confirmed as compatible for the intended application.