Mitsubishi Electric MXZ-SM42NLHZ Multi-zone Heat Pump 42000 Btu/h

Product Description

The MITSUBISHI ELECTRIC MXZ-SM42NLHZ is a 42000 BTU/h outdoor condensing unit designed for multi-zone variable-refrigerant mini-split systems. It operates on R454B refrigerant and uses an inverter-driven compressor to deliver both heating and cooling across up to 5 indoor zones. The Hyper Heat designation indicates extended heating capacity at low outdoor ambient temperatures, making this unit suitable for cold-climate installations. A compatible branch box is required to distribute refrigerant flow to individual zone air handlers. Licensed HVAC technicians perform the installation and refrigerant charging.

This outdoor unit fits residential and light-commercial multi-zone applications where a single condensing unit must serve several rooms or zones independently. With capacity up to 42000 BTU/h and support for up to 5 zones, it is suited for medium to larger homes or small commercial spaces requiring individual zone control. The branch box accessory connects the outdoor unit to each indoor air handler, enabling independent temperature management per zone. Proper system design requires matching indoor unit capacities to the total available outdoor capacity.

Key Features

• 42000 BTU/h total system capacity supports multi-zone configurations
• R454B refrigerant — a lower-GWP alternative to R410A
• Inverter-driven compressor modulates output for efficient capacity matching
• Hyper Heat technology maintains heating performance in low outdoor ambient conditions
• Supports up to 5 indoor zones via required branch box
• Smart Multi system architecture allows independent zone control

Compatibility

Designed for use in Mitsubishi Electric Smart Multi Hyper Heat inverter systems requiring a branch box for multi-zone distribution. A branch box accessory is required; up to 5 indoor zone units can be connected. Consult Mitsubishi Electric system design guides to confirm compatible indoor unit models and branch box part numbers.

Installation Notes

Installation must be performed by a licensed HVAC technician certified to handle R454B refrigerant under applicable EPA Section 608 regulations. Shut down all electrical power to the system before making any electrical or refrigerant connections. The branch box must be installed and wired per the manufacturer wiring diagram before connecting indoor units. Follow local mechanical and electrical codes, including NEC requirements for disconnect sizing and refrigerant line set specifications.

Technical Specifications

• Capacity: 42000 BTU/h
• Item Type: Outdoor Unit
• Refrigerant: R454B
• Maximum Zones: 5

Standard Information

• Brand: MITSUBISHI ELECTRIC
• Manufacturer Part Number: MXZ-SM42NLHZ