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 / AMST42CU1300 is a split heat pump system pairing a nominal 3-ton commercial outdoor heat pump with a multi-position indoor air handler. Designed to provide year-round heating and cooling for suitable ducted applications, this combination features a high-efficiency Copeland scroll compressor, R-32 refrigerant, and a nine-speed electronically commutated motor (ECM) blower. The AMST42CU1300 provides flexible indoor airflow options and installation configurations. Confirm the approved equipment match, certified performance ratings, and electrical requirements against the applicable Daikin documentation before installation.

Key Benefits

• Efficient Heating and Cooling – The DH4SEA3640 outdoor heat pump has published ratings of up to 14.3 SEER2, 12.5 EER2, and 7.5 HSPF2, supporting efficient operation under rated conditions.
• Year-Round Heat Pump Operation – Reversible heat pump technology provides heating and cooling through one outdoor unit.
• Nominal 3-Ton Outdoor Capacity – The DH4SEA3640 is rated at 36,000 BTU/h nominal cooling and heating capacity for appropriately sized applications.
• Nine-Speed ECM Blower – The AMST42CU1300 provides multiple blower-speed settings to accommodate ducted airflow requirements.
• Multi-Position Installation – The indoor air handler supports approved installation orientations, offering flexibility in equipment placement.
• Ducted Air Distribution – The indoor unit connects to compatible ductwork to distribute conditioned air throughout the served space.
• Copeland Scroll Compressor – The outdoor heat pump uses scroll compressor technology and CoreSense protection features to support dependable operation.
• Factory-Installed TXV – The indoor air handler's thermal expansion valve helps regulate refrigerant flow during system operation.
• Service-Friendly Outdoor Design – Accessible refrigerant service valves, gauge ports, and integrated pressure switches facilitate system inspection and maintenance.

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 outdoor unit has a published HSPF2 rating of 7.5. Its 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 AMST42CU1300. Heater-kit selection, minimum airflow, electrical requirements, and control configuration must be verified against Daikin's installation documentation.

Cooling Performance for Commercial Comfort

The DH4SEA3640 delivers nominal 36,000 BTU/h cooling capacity, equivalent to 3 tons, with a rated cooling capacity of 36,000 BTU/h under specified test conditions. Its 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 outdoor unit has published efficiency ratings of 14.3 SEER2 and 12.5 EER2. Its specified cooling operating range is 55°F to 125°F outdoor dry-bulb temperature. Actual capacity and efficiency for the DH4SEA3640 / AMST42CU1300 combination depend on the certified equipment match, indoor airflow, installation conditions, refrigerant charge, and operating environment.

Energy Efficiency and Refrigeration Technology

The DH4SEA3640 incorporates a high-efficiency Copeland scroll compressor and 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 required according to actual piping length and the installation instructions. The AMST42CU1300 features an all-aluminum evaporator coil with high-performance coated fin stock, a factory-installed TXV, and a direct-drive nine-speed ECM blower motor. The DH4SEA3640's published efficiency figures are outdoor-unit model ratings and should not be represented as certified ratings for this specific combination unless confirmed by the applicable matched-system performance data.

Split-System Design and Installation Flexibility

The split-system configuration separates the DH4SEA3640 outdoor heat pump from the AMST42CU1300 indoor air handler, allowing flexible equipment placement and duct routing. The DH4SEA3640 has a 3/8-inch liquid-line connection and a 7/8-inch suction-line connection, with sweat-connection service valves and accessible gauge ports. The factory refrigerant charge accommodates 15 feet of tubing, and any additional charge must be determined according to the manufacturer’s instructions. The AMST42CU1300 supports approved multi-position installation configurations and features a repositionable coil mounting track. Because the indoor air handler is nominally a larger capacity class than the 3-ton outdoor unit, verify approved system compatibility, required airflow, refrigerant piping, and certified performance before purchase or installation.

Controls and Indoor Comfort

The system requires a compatible heat pump thermostat and control configuration selected for the approved equipment combination. The AMST42CU1300's direct-drive, nine-speed ECM blower motor provides multiple airflow settings to support 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 when required. Thermostat selection, blower settings, auxiliary heat operation, heater-kit compatibility, and wiring must follow the equipment-specific installation instructions.

Commercial and Ducted Applications

The DH4SEA3640 is a nominal 3-ton, three-phase commercial heat pump intended for appropriately sized ducted applications. Potential applications include small offices, retail spaces, and other suitable conditioned areas where the system's capacity, duct design, electrical supply, and approved equipment match meet project requirements. The outdoor unit operates on 460V, 60 Hz, three-phase power, with a minimum circuit ampacity of 6.7 A and a maximum overcurrent protection rating of 10 A. The AMST42CU1300 uses a separate 208/230V single-phase electrical supply. These are separate unit requirements, and each power supply must match the corresponding equipment nameplate. The proposed outdoor and indoor combination must be verified against Daikin's approved compatibility and performance documentation.

Serviceability and Maintenance

The DH4SEA3640 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 top and side maintenance access, a removable grille-style top, and a rust-resistant steel louvered coil guard. The AMST42CU1300 includes a factory-installed TXV, an all-aluminum evaporator coil, and a repositionable coil mounting track. Routine maintenance should include inspection and cleaning of filters and coils, condensate drainage checks, electrical connection inspections, 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 advertises a 12-Year Parts Limited Warranty when the applicable online registration requirements are met within 60 days of installation. Warranty eligibility, registration conditions, coverage duration, and exclusions vary by product and applicable warranty certificate. Confirm the warranty coverage for both models and verify that the equipment combination is approved before purchase and installation. Refer to Daikin's official warranty documentation for complete details.

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 AMST42CU1300 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 DH4SEA3640 / AMST42CU1300

Support year-round indoor comfort with the Daikin DH4SEA3640 / AMST42CU1300 split heat pump system. Combining a nominal 3-ton commercial outdoor heat pump, Copeland scroll compressor technology, R-32 refrigerant, and a multi-position indoor air handler with nine-speed ECM airflow, this configuration offers a flexible ducted heating and cooling solution when equipment compatibility and matched-system performance have been verified for the intended application.