4-Pipe Vertical Fan Coil – DSC

Unilux vertical stacked fan coil units meet the requirements of UL 1995 / CSA22.2 #236 – Issue 2011 Standard for safety heating and cooling equipment.

Our 4-pipe vertical fan coil is the best HVAC solution for providing year-round heating and cooling to residents. Hot and cold-water connections let residents control their temperature with no limitations. The compact design and quiet technology make this VFC perfect for high-rise residences with limited space.

Create the best solution for your development with Unilux VFC. Our 4-pipe VFC configurations offer you the flexibility to choose the best HVAC system for your residences. We offer different fan options for large or small spaces and can improve ventilation with an HRV/ERV option.

Our HVAC vertical fan coils are easy to install and setup with expanded riser ends, piping branches with 2-way valves and a motorized electrical on/off switch.


  • 4-Pipe standard

Our Quality Commitment

We take pride in designing and building the top-quality vertical fan coil units available. We have a number of measures in place to ensure our customers experience long-lasting high-quality home comfort, including:

  • Being ETL Intertek approved for electrical safety standards on all units
  • Using trusted European suppliers for all valves and actuators
  • Working with some of the most-trusted suppliers in the industry for all components
  • Using North-American made coils and blowers designed specifically for Unilux VFC
  • Pressure testing all coils and assemblies for leaks with state-of-the-art testing equipment
  • Inspecting each unit as they are completed
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Standard cabinets are 20-gauge satin-coat steel. The cabinets are fully-insulated with ½-inch fiberglass bonded with a thermosetting resin. They’re coated on the airstream side with an acrylic facing – without the use of flammable adhesives. Insulation inside the unit is flame-spread rated no more than 25 and smoke developed rating no more than 50.

Choose an alternative cabinet material. Material options include 18-gauge galvanized steel, 20-gauge galvanized steel or 20-gauge satin-coat steel. You can also change the cabinet height from 84 inches to 80, 86 or 88 inches. We offer 2, 4 and 6-inch risers as well.

A 6-inch x 3.25-inch fresh air opening with or without a manual-sliding balancing damper or with a motorized balance damper can also be included.

Coil Assembly

We use coils with ½-inch OD copper tubes and mechanically-bonded corrugated aluminum fins. The number of rows and circuiting are selected to suit scheduled capacities. All coils are rated for a minimum working pressure of 450 psig.

We can design customized coils to meet project-specific design parameters or building operating requirements.

Fan Assembly

A thermally-protected, multi-speed ECM motor is resiliently mounted to a centrifugal fan which has a galvanized-steel forward-curved DWDI wheel in a painted housing.

Optional fans include ECM Endura (X13) constant-torque ECM fans or ECM EON constant-volume fans. The motors can be rated 115v, 208v or 277v.

Stainless Steel Drain Pan

Our no-leak drain pans are one-piece stainless-steel stamped products that are positively sloped for positive drainage. The drain hose forms a running P-Trap from the outlet to the condensate riser. The underside of each drain pan is insulated with ½-inch thick thermal and sound insulation.

Piping Branches

Piping branches are constructed with ½-inch type “L” copper. To allow for expansion and contraction of risers, we use stainless steel braided flex hoses. We include shut-off ball valves with flare nuts in the supply and return branches for easy removal.


Supply and return risers are type “L” copper. Condensate risers are type “DWV” copper. All risers have 75mm (3 inch) deep expanded ends for field installation. We insulate supply and return risers with 1-inch fiberglass covered with a vapor-barrier jacket, which complies with ASTM 84 for flame-spread and smoke-developed ratings. The insulation is continuous over the riser length within the height of the cabinet.

Optional riser configurations include type “M” copper for supply and return risers or type “M” copper for drain risers. Insulation options include insulating drain risers, changing the thickness to 3/8-inch, ½-inch, ¾-inch or 1-inch, or using closed-cell insulation.

Control Valve Package

Our standard control valve package is a factory-assembled 2-way control valve with flare nut connections to piping branches so they can be removed without using a torch or pipe cutters. The package includes motorized electrical “on/off” controlling. Control valves are piped normally-closed to the coil. We provide 3-way motorized valves on top of each riser if the main supply is on ground level. If the main supply is on the top level, we include a 3-way motorized control valve on the bottom of the riser. The Maximum entering water temperature on the control valve shall be 200°F and maximum operating pressure shall be 300 psig.

Alternative control options include 2-way and 3-way motorized control valves with electronic fail-safes, automatic balancing valve installed inside VFC, modulating control valve instead of on/off 2-position control valve, BTU thermal meter and thermal sensors installed inside the VFC, or a pressure independent control valve.

Access Panel

Our access panels are constructed of 20-gauge steel complete with a durable, baked enamel-powder finish. The return air opening grille with fixed horizontal louvers is integrated in the construction. The panel is hinged & removable for easy maintenance access.

Grilles and Registers

Double deflection supply grilles and registers have adjustable vertical and/or horizontal louvers. Registers are constructed with light-gauge metal complete with adjustable opposed blade dampers.

Optional register equipment includes aluminum supply air grilles, return air grilles and access panel, or supply air grilles with integrated manual-adjustable balancing damper.

Unilux VFC Micro-Processor Based Controller

Our Unilux VFC micro-processor controls all operations, including wall-mount thermostat with 7-day, 4-time bucket programming; 3-speed fan control; temperature setting and time, date and humidity display.

Upgrade to our Wi-Fi option to allow residents to control their HVAC system from anywhere with our Universe application – available for iOS & Android smartphones.


We include a 1-inch disposable filter with the return air grille.

Choose from our optional filters, including 1-inch pleated MERV-8 filter, 1-inch pleated MERV-11 filter or 1-inch pleated MERV-13 filter.

Water Prevention Sensors

We factory install a drain-pan overflow sensor that detects rising water levels in the drain pan and turns off the unit to prevent flooding.

We also include an anti-freeze temperature sensor that activates hot water connections when return air is below 4°C (40°F) to prevent freezing and flooding.

An audible alarm sounds if the unit enters protection mode.