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CTM CT-12HN – 12,000 BTU Marine Air Conditioner 230V 50/60HZ NMEA2000
CTM CT-12HN combines 12,000 BTU cooling with 230V 50/60HZ operation and NMEA2000 connectivity for marine climate system integration.
- 12,000 BTU capacity suits medium spaces.
- 230V supply supports listed installations.
- 50/60HZ operation accommodates listed frequencies.
- NMEA2000 connects networked marine controls.
- Cooling output serves onboard cabins.
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Description
A failing 12,000 BTU compressor rarely announces itself quietly — it starts as a hum that’s a little off, then a unit that runs constantly and still can’t quite hold the cabin temperature it used to. The CTM CT-12HN replaces that kind of aging 230V system with titanium coils, NMEA 2000 connectivity, and a documented cross-reference to the Dometic DTG12 and comparable OEM units, so the swap doesn’t turn into a full rewiring job.
Key Features of the CTM CT-12HN
- Titanium circulating coils outlast the copper coils found in most older-generation 230V units
- NMEA 2000 integration connects to Garmin EmpirBus, OneHelm, and Raymarine YachtSense, so the unit runs from the helm display instead of a dedicated panel
- Compatible with Micro-Air EasyStart soft starters, which can reduce the compressor’s starting amp draw by up to 75%
- Reverse cycle heating covers both cooling and heating needs from a single unit
- Stainless steel base and bolts pair with a rust-free ABS pan built for continuous saltwater exposure
- Reusable air filter cuts down on the ongoing cost of disposable filter replacements
CTM CT-12HN Technical Specifications
- Cooling Capacity: 12,000 BTU
- Voltage / Frequency: 208–240V, 50/60 Hz
- Refrigerant: R410A
- Current Draw (Cool / Heat): 4.3 A / 4.9 A
- Locked Rotor Amps: 23 A
- Fuse Rating (Min. / Max.): 10 A / 15 A
- Seawater Connections: 5/8″ (16 mm) inlet and outlet
- Dimensions (W x H x D): 20″ x 13.25″ x 12″
- Duct Ring Size: 5″ (127 mm)
- Net Weight: 50 lbs (22.7 kg)
- Connectivity: NMEA 2000 (Garmin EmpirBus, OneHelm, Raymarine YachtSense)
Why Choose the CTM CT-12HN
This model is a documented replacement for the Dometic DTG12 (part 205162129), DTU12 (205162120/205162121), Cruisair STX12/STQ12, and equivalent Marine Air, Marinaire, Flagship, and Webasto 230V 12K units. That matters most when you’re swapping a failed system and want to reuse existing ductwork and wiring rather than re-engineer the install from scratch.
This unit needs 230V shore power or generator capacity to run — it’s not the right fit for boats limited to 115V. For those, the CT-12N (same BTU rating, 115V input) is the correct counterpart.
What to Know Before Installing
- Pairs with the CTM PM500LH pump, matched to this unit’s water flow requirements
- Fuse sizing must stay within the 10–15A range specified for the unit to operate safely under load
- Return air grille needs at least 130 sq in of clearance for proper airflow
- NMEA 2000 setup is more straightforward with a technician familiar with your specific MFD brand, since configuration varies between Garmin, Raymarine, and other systems
| Brand | CTM Marine |
| Model | CT-12HN |
| Series | NMEA 2000 Ready |
| Country of Origin | USA |
| System Architecture | Self-Contained |
| Cooling Capacity | 12,000 BTU/h |
| Heating Capacity | 12,000 BTU/h |
| Voltage | 230V |
| Frequency | 50/60Hz |
| Phase | 1Ph |
| Running Amperage | 4.8A |
| Startup/LRA | 18A |
| Power Consumption | 1050W |
| Refrigerant Type | R-410A |
| Compressor Type | Rotary |
| Condenser Coil Material | Cupro-Nickel |
| Evaporator Coil Material | Aluminum |
| Air Flow Rate | 400 CFM |
| Static Pressure | TBC - Contact Manufacturer |
| Dimensions - Unit | 480x350x320mm |
| Dimensions - Elec Box | 200x150x80mm |
| Net Weight | 26.5kg |
| Noise Level | 53 dB(A) |
| Water Pump Req | 5.5 GPM |
| Min/Max Seawater Flow | 4.5-6.5 GPM |
| Seawater Inlet/Outlet | 5/8" MPT |
| Duct Connection | 6" |
| Control Interface | NMEA 2000 / Digital |
| Operating Temp Range | 10-40°C |
| IP Rating | IP22 |
| Certifications | CE, NMEA 2000 |
| Standard Warranty | 2 Years |
| Service Interval | 6 Months |
| Typical Installation | Salon/Main Cabin |
| Recommended Vessel Length | 30-40ft |
What's in the Box
- 1x CTM CT-12HN 12,000 BTU Self-Contained Marine Air Conditioner (230V - 50/60Hz)
- 1x Integrated NMEA 2000 Embedded Control Board
- 1x High-Velocity 360-Degree Rotatable Turbo Blower
- 1x Corrosion-Proof Titanium Seawater Circulating Coil
- 1x Heavy-Duty Stainless Steel Base Pan with ABS Drain Tray
- 1x Removable and Washable Mesh Air Filter
- 1x Remote Air Temperature Sensor Probe
- 1x User Manual and Installation Guide
CTM CT-12HN Marine AC FAQ
How much cooling does CT-12HN provide?
CTM CT-12HN provides a total of 12,000 BTU cooling. This self-contained setup is configured for mid-sized boat cabins, integrating an eco-friendly R410A system to balance relative humidity and decrease interior heat indexes while transmitting continuous telemetry across NMEA 2000 networks.
What is the weight of this unit?
CTM CT-12HN features a net weight of 50 lbs. The unit uses a stainless steel frame base and an ABS drain tray assembly to protect against marine corrosion or premature material failure without loading excessive weight down on small vessel hulls.
Where is CTM CT-12HN applied onboard?
CTM CT-12HN is ideal for small guest cabins and forward cuddy berths. It delivers targeted environmental comfort on cuddy cabins or center consoles from twenty-eight to thirty-eight feet, offering smart integration via modern glass bridge multi-function displays for consolidated helm operations.
| Product Metric | Factual Value |
|---|---|
| Current Draw | 10.8 Amps |
| Duct Connection | 5 inches |
| Blower Speed | 1200 RPM |
| Hose Fitting | 5/8 inch |
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