Carrier PHB448000K000B 4 Ton R-454B Heat Pump

Product Description

The CARRIER PHB448000K000B is a 4-ton entry-level heat pump using R-454B refrigerant, designed for residential and light-commercial split-system applications. This outdoor condensing unit provides both heating and cooling operation through a refrigerant-based vapor-compression cycle. Licensed HVAC technicians handle installation and service, as R-454B is an A2L refrigerant subject to specific handling requirements under current EPA and ASHRAE guidelines. The unit fits into standard split-system configurations where efficiency, reliability, and compliance with newer low-GWP refrigerant standards are required.

The PHB448000K000B is suited for residential split-system heat pump installations requiring a 4-ton capacity outdoor unit. It operates on R-454B, a lower-GWP alternative refrigerant that has become common in new equipment as manufacturers transition away from R-410A. This unit is appropriate for new installations where matched indoor air handlers or coils are specified for R-454B compatibility. Contractors working in jurisdictions that have adopted updated refrigerant regulations will find this unit aligned with those requirements.

Key Features

• 4-ton nominal cooling and heating capacity for residential split-system use
• Operates on R-454B low-GWP refrigerant in compliance with current transition standards
• Entry-level heat pump platform suitable for standard split-system replacements and new installs
• Outdoor condensing unit configuration for split-system pairing with compatible indoor equipment

Compatibility

Designed as an OEM-style outdoor heat pump unit for split-system configurations requiring R-454B refrigerant compatibility at 4-ton capacity. Pair only with indoor components rated and listed for R-454B service.

Installation Notes

Installation must be performed by an EPA Section 608 certified HVAC technician familiar with A2L refrigerant handling procedures. Shut off all electrical power to the system before making electrical or refrigerant connections. Follow local mechanical codes and manufacturer guidelines for clearances, refrigerant line sizing, and electrical disconnect requirements. R-454B requires tools and equipment rated for A2L refrigerants — do not use standard R-410A-only recovery or charging equipment without verifying compatibility.

Technical Specifications

• Nominal Capacity: 4 tons
• Refrigerant: R-454B
• Dimensions (L x W x H): 70.5 inches

Standard Information

• Brand: CARRIER
• Manufacturer Part Number: PHB448000K000B