Panasonic CU-HM18BAHU INTERIOS 1.5 Ton Cold Climate Outdoor Heat Pump

Product Description

The Panasonic CU-HM18BAHU is a 1.5-ton cold-climate outdoor heat pump designed for Panasonic INTERIOS central heat pump and hybrid heating systems. It can be paired with the CS-HM24BAAU1 or CS-HM24BAAU2 A-coil for hybrid heating and cooling applications, integrating with a new or existing furnace for whole-home comfort. The system uses R454B refrigerant and is designed for cold-climate heating operation down to -20°F (-30°C).

Key Features

• 1.5 Ton Capacity: Provides 18,000 BTU/h rated cooling capacity and 19,000 BTU/h rated heating capacity.
• Cold Climate Heating: Designed for heating operation down to -20°F (-30°C).
• 18,000 BTU Heating at 5°F: Delivers 18,000 BTU/h at 5°F with a COP of 2.06.
• R454B Refrigerant: Uses R454B refrigerant for the INTERIOS cold-climate heat pump system.
• Inverter Heat Pump Condenser: Variable-capacity operation helps provide efficient heating and cooling.
• ENERGY STAR Cold Climate Certified: Part of Panasonic's ENERGY STAR Cold Climate certified INTERIOS system.
• Hybrid Heating Compatible: Designed to integrate with an existing or new furnace when paired with a compatible INTERIOS A-coil.
• Extreme Cold Operation: Provides a standard heating operating range down to -22°F (-30°C) in the submittal specifications.
• Quiet Operation: Outdoor sound level is approximately 58-59 dBA according to Panasonic's technical documentation.
• Built-In Base Pan: Supports cold-weather operation and helps manage condensate during low-temperature heating.

Specifications

• Model: CU-HM18BAHU
• Product Type: Outdoor Heat Pump Condenser
• Series: Panasonic INTERIOS Extreme Heat Series
• Capacity Class: 1.5 Ton
• Rated Cooling Capacity: 18,000 BTU/h
• Cooling Capacity Range: 5,600-22,800 BTU/h
• Rated Heating Capacity at 47°F: 19,000 BTU/h
• Heating Capacity Range at 47°F: 5,600-22,800 BTU/h
• Heating Capacity at 17°F: 15,200 BTU/h
• Heating Capacity at 5°F: 18,000 BTU/h
• COP at 5°F: 2.06
• Moisture Removal: 2.05 L/h
• SEER2: 16.1
• EER2: 11.7
• HSPF2 Region IV: 9.5
• HSPF2 Region V: 7.8
• Refrigerant: R454B
• Refrigerant Oil: VG74
• Refrigerant Oil Charge: 620 mL

Electrical Specifications

• Outdoor Power Supply: 208/230V, Single Phase, 60Hz
• Outdoor Minimum Circuit Ampacity: 16 A
• Maximum Overcurrent Protection: 20 A
• Compressor Rated Load Amps: 10.5 A
• Outdoor Fan Motor Rated Load Amps: 0.9 A
• Indoor Power Supply for Compatible System: 24V, 60Hz, Single Phase
• Communication Wiring: AWG 20-2
• Cooling System Power Input: 1,538 W rated; 530-2,120 W range
• Heating System Power Input: 1,687 W rated; 350-2,040 W range

Compressor & Outdoor Unit

• Compressor Type: Rotary
• Compressor Model: KTM240D46UKT2
• Outdoor Airflow: 1,766 CFM maximum
• Outdoor Noise Level: 58 dBA
• Outdoor Fan Motor: DC motor
• Heat Exchanger: Outdoor coil designed for cold-climate heat pump operation

Operating Conditions

• Cooling Outdoor Operating Range: -22°F to 122°F (-30°C to 50°C)
• Heating Outdoor Operating Range: -22°F to 75°F (-30°C to 24°C)
• Cold Climate Heating: Down to -20°F (-30°C)
• Heating at 5°F: 18,000 BTU/h
• Heating COP at 5°F: 2.06

Piping Specifications

• Refrigerant Control: Electronic Expansion Valve (EXV)
• Liquid Pipe Size: 3/8 in
• Gas Pipe Size: 3/4 in
• Maximum Piping Length: 98 ft (30 m)
• Maximum Height Difference: 66 ft (20 m)
• Maximum Pre-Charged Piping Length: 24.6 ft (7.5 m)
• Factory Refrigerant Charge: 74.08 oz (2.1 kg)
• Additional Refrigerant Charge: 0.7 oz/ft (65 g/m)
• Connection Method: Flared

Dimensions & Weight

• Outdoor Unit Dimensions: 35.04 x 13.46 x 26.50 in (W x D x H)
• Outdoor Unit Dimensions: 890 x 342 x 673 mm (W x D x H)
• Outdoor Unit Weight: 101.4 lb (46 kg)
• Package Dimensions: 39.17 x 15.67 x 29.13 in (W x D x H)
• Gross Shipping Weight: 109.13 lb (49.5 kg)
• Package Dimensions: 995 x 398 x 740 mm (W x D x H)

Compatible Indoor A-Coils

• CS-HM24BAAU1
• CS-HM24BAAU2

System Applications

• System Type: Central ducted heat pump
• Application: Hybrid heating and cooling / dual-fuel system
• Indoor Configuration: A-coil integrated with a new or existing furnace
• Compatible System: Panasonic INTERIOS 1.5 Ton Hybrid Heat Pump System
• Refrigerant: R454B
• Certification: ENERGY STAR Cold Climate

Note: CU-HM18BAHU is an outdoor heat pump unit and must be paired with a compatible Panasonic indoor A-coil. Panasonic lists CS-HM24BAAU1 and CS-HM24BAAU2 as compatible A-coils for the 18K configuration. Always verify the complete system combination, piping requirements, electrical requirements, and installation conditions before installation.