Description
The Comfort-aire MBR120AKC30C01S is a 10-ton, 13.7 EER belt-driven water source heat pump package unit built for commercial buildings where a central water loop handles the heat exchange instead of outdoor air. If you're replacing an aging WSHP in a mid-rise office, hotel, or school — or equipping a new loop-fed system — this unit delivers both heating and cooling from a single horizontal package running on 230V three-phase power. The right-return, straight-supply configuration fits the most common commercial horizontal installations without field-modifying the duct connections.
Key Features
- 10-Ton Capacity: Covers large commercial zones — open-plan offices, conference wings, or hotel floors — that smaller units can't serve in a single package.
- 13.7 EER Efficiency: Higher energy efficiency ratio means lower operating costs on a water loop system that runs year-round.
- Belt-Driven Blower: Adjustable belt drive lets a technician dial in the exact airflow your duct system needs without swapping motors.
- Right Return / Straight Supply: Factory-configured duct orientation drops into the most common horizontal commercial ceiling plenum layout without field modifications.
- Horizontal Water Source Package: Self-contained unit — compressor, heat exchanger, and coil in one cabinet — connects directly to the building water loop and existing ductwork.
- 5-Year Compressor / 1-Year Parts Warranty: Comfort-aire backs the heart of the unit for five years, giving building owners and contractors a clear picture of covered risk on a commercial installation.
Is this the right unit for your project?
The MBR120AKC30C01S is sized for large commercial spaces typically in the 3,500–5,000 square foot range per zone, depending on building envelope, occupancy load, and climate. It fits multi-story buildings — hotels, office buildings, schools, condominiums — already plumbed with a central water loop. Under-specifying a replacement unit in a high-load zone will leave the system short of capacity; over-specifying wastes energy and causes short-cycling. A formal Manual J or equivalent commercial load calculation confirms the right fit before you order.
Water source heat pump vs. air source package unit
An air source package unit sits on a rooftop and rejects or absorbs heat from outdoor air — simple to install, but efficiency drops when outdoor temps hit extremes. A water source heat pump like the MBR120AKC30C01S rejects and absorbs heat through a building water loop, which stays in a much tighter temperature band year-round. That stable loop temperature is why WSHP systems consistently outperform air source units on annual energy costs in commercial buildings. The trade-off: you need an existing (or newly installed) central water loop, cooling tower, and boiler plant. If that infrastructure is already there, the WSHP wins on efficiency and longevity.
Where it fits best
- Mid-rise hotel guest floor replacement — horizontal ceiling plenum installation
- Office building interior or perimeter zone serving large open-plan areas
- School or university building with a central geothermal or condenser water loop
- Condominium or apartment corridor and common-area conditioning
- Commercial retrofit where an existing WSHP is being swapped out for higher efficiency
Why water loop efficiency matters at 10 tons
At 10-ton commercial scale, the gap between a 10 EER unit and a 13.7 EER unit translates to real dollars on an energy bill running 8–12 hours a day. Water source systems earn their efficiency by exchanging heat with a loop held between roughly 60°F and 90°F, rather than fighting 95°F summer air or 15°F winter air like a rooftop unit does. The belt-driven blower on the MBR120AKC30C01S adds another layer of control — a tech can trim fan speed to match actual static pressure in the duct system, keeping the unit running at its rated efficiency rather than fighting an undersized or oversized duct design.
Installation & what else you’ll need
The MBR120AKC30C01S requires 230V three-phase power — confirm your electrical service and disconnect sizing with a licensed electrician before ordering. The unit connects to the building's supply and return water loop; loop connections, flow rates, and water treatment are the mechanical contractor's scope. Horizontal installation in a ceiling plenum requires adequate clearance for belt-drive service access. You'll need a matched supply plenum or duct transition for the straight-supply outlet, and the right-return connection must match your existing duct size. EPA 608 certification is required for any refrigerant handling. A licensed commercial HVAC contractor should handle the full installation, including water loop balancing and airflow commissioning.
Frequently Asked Questions
What is the cooling capacity of the Comfort-aire MBR120AKC30C01S?
The MBR120AKC30C01S is a 10-ton water source heat pump, meaning it delivers 120,000 BTU of cooling capacity. At 13.7 EER, it produces that output efficiently on a stable building water loop, making it well-suited for large commercial zones in multi-story buildings.
What voltage and phase does the MBR120AKC30C01S require?
The MBR120AKC30C01S runs on 230V three-phase power. This is a commercial-grade electrical requirement — confirm your building's electrical service and have a licensed electrician size the disconnect and wiring before the unit ships.
How does a water source heat pump work compared to a regular package unit?
A water source heat pump rejects and absorbs heat through a building water loop rather than outdoor air. Because the loop stays in a relatively stable temperature range year-round, the system runs more efficiently than an air source unit that has to fight extreme outdoor temperatures in summer and winter.
What does belt-driven mean on a commercial heat pump, and why does it matter?
Belt-driven means the blower motor drives the fan wheel through an adjustable belt and pulley system rather than a direct shaft connection. This lets a technician adjust fan speed to match the static pressure of your specific duct system, keeping airflow and efficiency at design conditions after installation.
What duct configuration does the MBR120AKC30C01S use?
The MBR120AKC30C01S is configured for right return and straight supply in a horizontal orientation. This matches the most common commercial ceiling plenum layout and avoids field modifications to the cabinet when replacing a similarly configured unit.
What warranty does the Comfort-aire MBR120AKC30C01S carry?
Comfort-aire covers the MBR120AKC30C01S with a 5-year compressor warranty and 1-year parts warranty. For commercial equipment at this capacity, the extended compressor coverage is meaningful — the compressor is the most expensive component in the unit to replace.
White Paper
- Comfort-aire MB Series Product Catalog (Part 1 of 2)
- Comfort-aire MB Series Product Catalog (Part 2 of 2)
- Comfort-aire MB Series Spec Sheet
- Comfort-aire MB Series Installation Manual (Part 1 of 3)
- Comfort-aire MB Series Installation Manual (Part 2 of 3)
- Comfort-aire MB Series Installation Manual (Part 3 of 3)
