Daikin 3 Ton 13.4 SEER2 Heat Pump and Multi-Positional Air Handler System | 208/230V 3 Phase - R32 - Single Stage

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

The Daikin DH4SEA3630 / AMST42CU1300 combines a nominal 3-ton commercial split heat pump with a multi-position indoor air handler designed for ducted heating and cooling applications. The DH4SEA3630 outdoor unit features a high-efficiency Copeland scroll compressor, R-32 refrigerant, and three-phase electrical operation, while the AMST42CU1300 indoor air handler features a multi-speed, nine-speed electronically commutated motor (ECM) blower and a factory-installed thermal expansion valve (TXV). This configuration offers flexible indoor air distribution and year-round heat pump operation. Confirm manufacturer-approved equipment compatibility and matched-system performance before purchase or installation.

Key Benefits

• Energy-Efficient Performance – The DH4SEA3630 outdoor unit has published ratings of up to 13.4 SEER2, 12.5 EER2, and 7.5 HSPF2 to support efficient heating and cooling operation.
• Year-Round Heat Pump Heating – Reversible heat pump operation provides heating and cooling through one outdoor unit.
• Nominal 3-Ton Cooling Capacity – The DH4SEA3630 provides 36,000 BTU/h nominal cooling 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 AMST indoor air handler series supports approved installation orientations, offering flexibility in equipment placement.
• Ducted Air Distribution – The indoor air handler connects to compatible ductwork to distribute conditioned air throughout the served space.
• Copeland Scroll Compressor – The outdoor unit incorporates scroll compressor technology and Copeland CoreSense technology 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 DH4SEA3630 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 extends from -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 indoor air handler. Heater-kit compatibility, required airflow, electrical requirements, and auxiliary heat controls must be verified against the applicable Daikin installation documentation.

Cooling Performance for Commercial Comfort

The DH4SEA3630 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 13.4 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 DH4SEA3630 / AMST42CU1300 combination depend on the approved matched-system configuration, indoor airflow, refrigerant charge, installation conditions, and operating environment.

Energy Efficiency and Refrigeration Technology

The DH4SEA3630 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 coated fin stock, a factory-installed TXV, and a direct-drive, nine-speed ECM blower motor. The DH4SEA3630's published efficiency ratings are outdoor-unit specifications and should not be represented as certified ratings for this particular equipment combination unless confirmed by Daikin's matched-system performance documentation.

Split-System Design and Installation Flexibility

The split-system configuration separates the DH4SEA3630 outdoor heat pump from the AMST42CU1300 indoor air handler, allowing flexibility in equipment placement and duct routing. The DH4SEA3630 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 additional refrigerant must be calculated according to the manufacturer's installation instructions. The AMST42CU1300 features a multi-position cabinet, an all-aluminum evaporator coil, and a factory-installed TXV. Because the indoor air handler is in a larger nominal capacity class than the 3-ton outdoor heat pump, confirm approved equipment compatibility, required airflow, refrigerant piping, and certified performance before purchase or installation.

Controls and Indoor Comfort

The system requires compatible heat pump controls and a thermostat selected for the approved equipment configuration. The AMST42CU1300 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. A compatible field-installed electric heat kit may provide supplemental heating when required. Thermostat selection, blower settings, auxiliary heat operation, heater-kit compatibility, and system wiring must follow the equipment-specific installation instructions.

Commercial and Ducted Applications

The DH4SEA3630 provides nominal 3-ton heating and cooling capacity for appropriately sized ducted applications. Potential applications include small offices, retail spaces, and other suitable conditioned areas where equipment capacity, duct design, electrical supply, and manufacturer-approved system compatibility meet project requirements. The DH4SEA3630 operates on 208/230V, 60 Hz, three-phase power, with a minimum circuit ampacity of 14.2 A and a maximum overcurrent protection rating of 20 A. The AMST42CU1300 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, airflow setup, duct design, and installation by qualified HVAC professionals are essential for dependable operation.

Serviceability and Maintenance

The DH4SEA3630 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 the controls. The AMST42CU1300 includes 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 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 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 DH4SEA3630 / AMST42CU1300

Support year-round indoor comfort with the Daikin DH4SEA3630 / AMST42CU1300 split heat pump system. Combining nominal 3-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 configuration offers a flexible ducted heating and cooling solution when manufacturer-approved compatibility and matched-system performance have been verified for the intended application.