Mitsubishi PAC-LMA30BC 3-Port Branch Box For Smart-Multi Systems - 454B - PACLMA30BC
The PAC-LMA30BC is a three-port branch box for use in multi-zone mini split applications with Mitsubishi's MXZ-SM36, MXZ-SM42, MXZ-SM48, and MXZ-SM60 outdoor condensers. It manages and distributes the flow of both refrigerant and power from the outdoor unit to all connected indoor units. With electronic LEVs, Mitsubishi's branch boxes ensure optimal refrigerant flow and an accurate indoor unit temperature for your mini split indoor units.
Includes
PAC-LMA30BC
What our Experts Think
Essential Multi‑Zone Component: The Mitsubishi PAC‑LMA30BC 3‑Port Branch Box is a key accessory for Smart‑Multi and MXZ‑SM series HVAC systems, enabling efficient multi‑zone configurations by managing refrigerant distribution from one outdoor unit to up to three indoor units.
Balanced Refrigerant Flow: Designed with precise flow control, it ensures even refrigerant distribution to each indoor unit so that performance remains stable across zones, improving overall system comfort and efficiency.
Smart Compatibility: Works with R‑454B refrigerant on compatible Mitsubishi Smart‑Multi or MXZ‑SM multi‑zone outdoor units, making it suitable for advanced residential or light commercial setups.
Compact & Durable Design: Built with a compact galvanized steel enclosure, this branch box is easy to position in tight mechanical spaces and resists corrosion for long‑term reliability.
Simplified HVAC Integration: Three dedicated liquid and gas line connections streamline installation and help reduce piping complexity in multi‑head systems.
Flexible System Planning: Ideal when you want to expand or zone your HVAC layout efficiently—perfect for homes or buildings needing customized comfort control across several indoor areas.
Pro‑Grade HVAC Choice: Recommended by professionals for properly engineered multi‑zone installations that require reliable refrigerant management and scalable performance.
Q&A
Q: What type of unit is this? A: This is a horizontal concealed ducted indoor air handler designed for mini‑split systems, ideal for discreet climate control through short duct runs.
Q: What capacity does it provide? A: It offers about 9,000 BTU nominal cooling and heating capacity, suitable for small‑to‑medium rooms (roughly up to ~350 sq ft).
Q: What refrigerant does it use? A: Uses R‑454B refrigerant, which has lower global warming potential (GWP) than older refrigerants, making it more environmentally friendly.
Q: What are the airflow and noise specs? A: Airflow ranges roughly 194–317 CFM, with quiet operation as low as 23 dB(A)—whisper‑quiet comfort suitable for bedrooms and living spaces.
Q: Is it compatible with multi‑zone systems? A: Yes — it works with both single‑zone and multi‑zone Mitsubishi systems and supports various control options, including wired, wireless, and app‑enabled comfort control.
Q: Does it include a controller? A: No — a thermostat/remote controller is not included and must be purchased separately.
Q: What installation space does it suit? A: Its ultra‑slim, low‑profile design (about 7‑7/8" tall) fits into tight ceiling cavities, soffits, or attic spaces where concealed ducting is preferred.
Q: What power requirements does it have? A: Operates on 208/230 V single‑phase electrical supply typical for HVAC indoor air handlers.
Maintenance Tips
Supports up to 3 indoor units in Smart‑Multi / MXZ‑SM systems.
Distributes R‑454B refrigerant efficiently for balanced performance across zones.
Durable galvanized steel construction for long-lasting protection.
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