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CTM CT-12N – 12,000 BTU Marine Air Conditioner 115V 50/60HZ NMEA2000
The CTM CT-12N specifies 12,000 BTU cooling, 115V power, 50/60HZ operation, and NMEA2000 connectivity for vessel climate management.
- 12,000 BTU output handles moderate cooling.
- 115V requirement suits listed electrical systems.
- 50/60HZ rating covers listed frequencies.
- NMEA2000 supports connected climate controls.
- Unit cools designated onboard spaces.
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Description
115V systems are still the norm on plenty of boats, especially smaller cruisers and older refits that were never wired for 230V shore power. The CTM CT-12N covers that gap directly — a 12,000 BTU marine air conditioner built for standard 115V circuits, carrying the same titanium coil construction and NMEA 2000 support found in CTM’s 230V models, just tuned for a different electrical setup.
Key Features of the CTM CT-12N
This is a self-contained unit designed to deliver full-size cooling without asking for a voltage upgrade most boats don’t have.
- Titanium coils resist saltwater corrosion significantly better than the copper coils used in older units
- NMEA 2000 connectivity lets the unit take commands from Garmin, Raymarine, or OneHelm-equipped MFDs at the helm
- Micro-Air EasyStart soft starter compatibility reduces the current spike at startup, useful for boats running on smaller generators
- Rotatable turbo blower directs airflow to where the cabin actually needs it
- Reusable air filter design skips the recurring cost of disposable replacements
CTM CT-12N Technical Specifications
- Cooling Capacity: 12,000 BTU
- Voltage / Frequency: 100–120V, 50/60 Hz
- Refrigerant: R410A
- Current Draw (Cool / Heat): 8.7 A / 10.8 A
- Locked Rotor Amps: 43 A
- Fuse Rating (Min. / Max.): 16 A / 25 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)
Is the CT-12N Right for Your Boat?
Current draw runs higher on this unit than its 230V counterpart — 8.7A cooling versus 4.3A — which is expected, since 115V circuits need more amperage to produce the same output. Before installing, it’s worth confirming your panel and breaker can handle the 16–25A fuse range this unit calls for. It’s a documented replacement for the Dometic DTG12, DTU12, Cruisair STQ12/STX12, and equivalent Marine Air, Flagship, and Webasto 115V units.
If 230V power is already available on your boat, the CT-12HN draws less current for the same cooling capacity and is generally the more efficient electrical match — the CT-12N exists specifically for boats without that option.
What to Know Before Installing
- The CTM PM500L pump (500 GPH, 115V) is the matched water pump for this model
- Confirm your electrical panel supports the 16–25A fuse range before committing to installation
- Return air grille clearance should meet the 130 sq in minimum for unrestricted airflow
- Soft start compatibility is worth using on boats running smaller generators, since it noticeably reduces the startup power spike
| Brand | CTM Marine |
| Model | CT-12N |
| Series | NMEA 2000 Ready |
| Country of Origin | USA |
| System Architecture | Self-Contained |
| Cooling Capacity | 12,000 BTU/h |
| Voltage | 115V |
| Frequency | 50/60Hz |
| Phase | 1Ph |
| Running Amperage | 9.5A |
| Startup/LRA | 35A |
| 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-12N 12,000 BTU Self-Contained Marine Air Conditioner (115V - 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-12N Marine AC FAQ
How much does CTM CT-12N weigh?
CTM CT-12N weighs exactly 50 lbs net weight. This mid-sized self-contained marine air conditioner delivers 12,000 BTU of cooling and reverse cycle heating capacity, optimizing environmental parameters inside boat cabins without structural weight complications. It is built to communicate natively over standard NMEA 2000 digital backbones.
What duct size does this unit need?
CTM CT-12N requires a 5 inch duct ring size. This dedicated diameter specification allows your high-velocity 360-degree rotatable turbo blower assembly to distribute high volume air freely, eliminating static pressure constraints inside narrow bulkheads and maintaining uniform thermal reduction throughout boat living quarters.
Where should you install CTM CT-12N?
CTM CT-12N is ideal for mid-sized master staterooms and aft cabins. Marine technicians typically install this 12,000 BTU unit under settees or V-berths on express cruisers up to thirty-six feet, where its compact footprint fits narrow companionways and native 115V design matches common dockside shore power configurations.
| Hardware Specification | Verified Metric |
|---|---|
| Cooling Capacity | 12,000 BTU |
| Voltage Rating | 115V 50/60Hz |
| Refrigerant Charge | R410A |
| Waterline Port | 5/8 inch |
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