Description
The Comfort-aire MBL120BKC30C01S is a 10-ton, 13.7 EER water source heat pump package unit built for commercial installations where a single horizontal unit needs to handle serious heating and cooling loads without a split system. If you're retrofitting a building with an existing water loop or designing a new water-source system, this unit ships ready to connect — belt-driven fan, left-return/straight-supply configuration, 230V three-phase power. It's a purpose-built commercial workhorse, not a residential unit scaled up.
Key Features
- 10-Ton Capacity: Handles large commercial zones — office floors, retail spaces, or multi-room suites — that smaller package units can't touch.
- 13.7 EER Efficiency: Delivers strong energy performance on a water-source loop, which keeps operating costs lower than comparable air-source equipment in most commercial applications.
- Belt-Driven Fan: Lets you adjust fan speed and airflow to match your duct layout without swapping out the entire motor assembly.
- Left-Return / Straight-Supply Horizontal Configuration: Designed for horizontal installation with left-side return air entry and straight supply discharge — a configuration that fits suspended ceiling or equipment room installs where vertical units won't work.
- 230V Three-Phase Power: Connects directly to standard commercial three-phase electrical service, so you're not chasing special transformers or panels.
- 5-Year Compressor Warranty: Covers the most expensive component for five years, giving building owners and contractors real protection on a large commercial investment.
Is this the right unit for your project?
The MBL120BKC30C01S is sized for large commercial zones — think open office floors, retail spaces, or multi-tenant suites running roughly 3,000 to 4,000 square feet depending on load, insulation, and climate. That's a rule of thumb; a proper Manual J or commercial load calculation confirms the right fit. Don't drop a 10-ton unit into a zone that needs 6 tons — oversizing on water-source equipment causes short cycling and humidity problems just like it does in residential work. This unit requires an existing or new water-source loop with the capacity to support a 10-ton load.
Water source heat pump vs. air-source package unit
A water-source heat pump like the MBL120BKC30C01S pulls heat from a condenser water loop instead of outdoor air. That means efficiency stays consistent year-round — the loop temperature doesn't swing the way outdoor air does in extreme weather. Air-source units are easier to install because they don't need a water loop, but in buildings that already have a loop (or where one makes economic sense across multiple zones), water-source equipment typically runs more efficiently over time. If there's no water loop in the building and no plan to install one, an air-source unit is the simpler path. If the loop is already there, the MBL120BKC30C01S is built to use it.
Where it fits best
- Commercial office floors or multi-tenant suites on an existing water-source loop
- Horizontal ceiling-suspended installs in equipment rooms or above drop ceilings
- Retail or hospitality spaces requiring large-zone climate control from a single package unit
- Building retrofits replacing older water-source equipment with a current-efficiency unit
- New commercial construction where a central water loop serves multiple package units across floors
Installation & what else you’ll need
This unit requires a licensed HVAC contractor and a commercial electrician. You'll need 230V three-phase electrical service with proper disconnect and wiring sized to the unit's full-load amperage — verify FLA from the unit nameplate before sizing wiring and breakers. The horizontal configuration means you'll need adequate structural support for ceiling suspension or a properly rated equipment platform. Plan for water supply and return connections to the condenser loop, supply and return duct connections matched to the straight-supply/left-return layout, and condensate drainage. A belt-drive fan setup means you'll want to confirm sheave and belt sizing are set for your target airflow before startup. This is not a homeowner-installed unit — commercial HVAC work of this scale requires licensed professionals.
Frequently Asked Questions
How many tons is the Comfort-aire MBL120BKC30C01S?
The MBL120BKC30C01S is a 10-ton water source heat pump package unit. That puts it squarely in commercial territory — sized for large open zones, multi-room suites, or full office floors where a single package unit needs to handle serious heating and cooling demand.
What EER rating does the MBL120BKC30C01S have?
The MBL120BKC30C01S is rated at 13.7 EER. For a water-source heat pump, that's solid efficiency — the unit draws from a condenser loop rather than outdoor air, so efficiency holds steadier across seasons than comparable air-source equipment.
What voltage and phase does this water source heat pump require?
The MBL120BKC30C01S runs on 230V three-phase power. It's designed for standard commercial electrical service. A licensed electrician should verify panel capacity, wire sizing, and disconnect requirements before installation.
What does left-return straight-supply mean on a horizontal heat pump?
Left-return means the unit pulls return air from the left side when you're facing the unit. Straight-supply means conditioned air discharges straight out — not at an angle. This configuration determines how the unit fits into your ductwork layout, so confirm your duct plan matches before ordering.
What is the compressor warranty on the Comfort-aire MBL120BKC30C01S?
Comfort-aire covers the compressor on the MBL120BKC30C01S for five years. On a 10-ton commercial unit, that's meaningful coverage — the compressor is the most expensive component, and five years of protection matters when you're making a capital investment of this scale.
Can a water source heat pump be installed without an existing water loop?
No — a water source heat pump requires a condenser water loop to operate. If your building doesn't already have one, you'd need to design and install a loop system before this unit can run. For buildings without a water loop, an air-source package unit is a more practical choice.
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)
