Heatcraft® Modular Auxiliary Removable Coil Unit (M.A.R.C. Unit)
The Heatcraft® M.A.R.C. Unit (Modular Auxiliary Removable Coil Unit) is a versatile, factory-built cased coil system designed to provide flexibility, easy maintenance, and long-term performance. Unlike standard cased coil units, the M.A.R.C. Unit is engineered with a removable access panel, allowing the enclosed coil to be serviced or replaced without compromising the integrity of the
The Heatcraft® M.A.R.C. Unit (Modular Auxiliary Removable Coil Unit) is a versatile, factory-built cased coil system designed to provide flexibility, easy maintenance, and long-term performance. Unlike standard cased coil units, the M.A.R.C. Unit is engineered with a removable access panel, allowing the enclosed coil to be serviced or replaced without compromising the integrity of the case.
This innovative design reduces downtime, extends equipment life, and prevents costly replacements by enabling coil-only swaps instead of requiring an entirely new unit. All seams are sealed with silicone and weather-stripping, ensuring a durable, leak-free case suitable for demanding HVAC environments.
Key Applications of Heatcraft® M.A.R.C. Units:
- Replacing coil sections in existing air handling units
- Fitting tight-space applications or small door access situations (such as cruise ships or confined facilities)
- Adding heating or cooling capacity to make-up air units
- Providing auxiliary or supplemental heating/cooling in specialized environments
Every M.A.R.C. Unit is custom-built to specification, ensuring the right fit and performance for your project’s unique requirements.
| Coil Section Construction | Americas |
| Tubing | 3/8”, 1/2” O.D. Cu & 5/8” O.D. Cu, CuNi, St Stl, Carbon Stl, AD Brass |
| Circuit Type | Quarter, Half, Three Quarter, Single, One and one half, Double, Triple or Custom |
| Rows | 1, 2, 3, 4, 5, 6, 8, 10, 12 |
| Fin Surface | Sine Wave (corrugated), New Ripple (peak and valley) or Flat |
| Tube Patterns | Various |
| Casing / Mounting | 16 Gauge Galvanized or 304 Stainless Steel |
| Connections | Carbon Steel, Stainless Steel, Red Brass, Copper (Braze, MPT, FPT, Victaulic, Welded) |
| Vents & Drains | Standard |
| Fin Material | Aluminum, Copper all tube sizes Stainless Steel, Carbon Steel – 5/8″ Only |
| Options | Double Wall, Filter Rack/Hinged Access, Removable Coil, Extended V & D, 3/4″ Insul. |
| Links | Certified Drawing: MarcUnit Field Specification Drawing |
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