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CTM CX-24H 24,000 BTU Condenser - Marine Split A/C Unit - 230V - 50/60HZ - R410A

50/60 HzDual Frequency Cooling or HeatingReverse Cycle Titanium (Ti) CoilsAnti-Corrosive 2-YearWarranty

Reference: 55201X
In Stock: 10
Add Elite II Control with 8-Pin Cable (10 ft) - $160.00

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CTM CX-24H Condensing Unit - 24,000 BTU Split Marine Air Conditioning Unit - 230V - 50/60HZ

24,000 BTU marine air conditioning system by CTM Marine - Powerful, quiet, and efficient cooling. 230V. Titanium circulating coils, stainless steel bolts, and stainless steel structural pan ensure long-lasting, corrosion-proof compressor / condensing unit performance in even the toughest of marine environments. 2 Year Warranty*. Patent Pending S/N 63/104189.


The CTM Split Marine Air Conditioning Unit is a great option for new installs but also works as the perfect drop-in replacement for all major marine A/C brands including Dometic, Marine Air, and Cruisair. The CTM split unit is fully compatible with all Dometic, Cruisair, Marine Air, and Micro Air controls/thermostats and cables, making replacement of those systems a breeze.

24000 BTU Marine Air Conditioner

CTM has taken nearly a decade of experience as a top-selling marine A/C retailer in the US, and combining this with an understanding of the wants and needs of marine A/C customers — as well as where other major brands could be improved — CTM has created a split marine condensing unit that raises the bar on quality and performance.

By using R410A refrigerant, CTM engineers guarantee maximum cooling performance while meeting all international standards of clean air.

All CTM Control Boards, Temperature Sensors, and cables are made in the United States under strict quality standards. Every CTM Unit comes with an industry-standard 2-year warranty*, knowledgeable and attentive customer service, and ships ground to you free of charge within the US.

As marine A/C retailers, as well as boaters ourselves, we know what boaters are looking for in a marine A/C system — and this is exactly what the CTM line delivers


CX-24H Unit Dimensions
24,000 BTU
208-240 V
50-60 Hz
Refrigerant Type
Current Consumption Cool / Heat 
7.6 A / 9.0 A
Locked Rotor Amps
50 A
Fuse Max. / Min.
25 A / 16 A
Discharge Connection Size
(3/8 in) / (9.53 mm)
Suction Connection Size
(5/8 in) / (15.9 mm)
Seawater Inlet Connection 
5/8" / 16 (in/mm)
Suggested Water Flow
500 GPH
Net Weight 
60 lbs / 27 kg

Features of the CTM CX-24H
CTM CX-24H Features

   Compact Design
Perfect drop-in replacement for all major marine A/C Brands. It's compact design makes it the perfect unit for small spaces.
Electrical-Box.jpg   Electrical Box
Rugged electrical box with fire retardant cover.
   Titanium Condenser Coil
The most corrosion-resistant material available for seawater cooling coils. 40% more resistant than copper, titanium coils guarantee top cooling performance and a rust-free environment. 
   Stainless Steel Frame Base
Corrosion-resistant stainless steel frame base will not rust or fall apart. Long-lasting and made to withstand the harsh marine environment. 
Universal Board.png   Universal Control Board
Next generation control board is compatible with most controllers in the market, such as OEM Brands like Dometic, Cruisair, and Marine Air. Also supports the TSEP Temperature sensor. Made in USA.
Reverse Valve.png   Reverse Cycle Cooling & Heating
Enjoy powerful cooling from your CT Unit with the option of heating if needed. Thanks to the reverse cycle, you can switch to heating when temperatures get low.
Quiet.png   Quiet
Very quiet yet powerful marine air conditioning unit, making it a great option for powerboats and sailboats.  
Smart Touch.png   Digital Touch Control
The CT is compatible with the CTM Touch display - a 2.5" Color Display with the latest technology in the industry, including numerous programmable parameters, operational features, and much more.


Cx-24H Unit Dimensions
A - Width
9.8 in / 250 mm
B - Height
15.4 in / 392 mm
C - Depth
13.5 in / 344 mm

Universal Control Board Layout

Compatible with Most Thermostats

CTM Elite II Control.jpg
Smart Touch / Easy Touch CTM Elite II  Passport I/O SMXir

Because the CTM unit comes with the Universal Control board, it should work with the controller you currently have. Supported controllers include the SMXirPassport I/OSmart Touch, and Elite II. However, there are some older versions of the SMXir and Passport i/o controllers that don't have the firmware to work with the new universal board. A newer version of the SMXir or the Passport i/o.

More information on CTM

CTM Marine Air Conditioning
CTM CX & CTM EV – CTM Marine Split Gas Air Conditioning System

CTM Marine has taken 10+ years of experience selling marine air conditioners, combined with feedback received from customers on their units over the years, and has produced the all-new, CTM CX & CTM EV split gas marine air conditioning system, superior to anything available on the market.

Read More
Best marine air conditioning unit
Best Marine Air Conditioners? Best Brand, Support & Warranty?

Boaters often wonder which brand makes the best marine air conditioners when looking to install a new unit. 

To be honest, most marine air conditioners from all the major brands are solid and will do the job, as long as they’ve been installed correctly. However, the keyword here is most. You want to improve your odds of being satisfied with your A/C purchase by researching which company’s units have the least number of complaints… and if there is a problem, how that company handles it.

Read More

Notes if replacing a Dometic DEU Unit

The CTM CX-24H 230V Marine Air Conditioning Unit works as an excellent replacement for the Dometic DEU. There are some specs that should be taken into consideration when replacing one of the units previously mentioned. It is also a good replacement unit for the Cruisair RX models, but in the case of the RX units, you will need to replace the evaporators (being that they use R22 / R417A gas and the CX unit and evaporators use R410A)

- Because the CX-24H split unit comes with the Universal Control board, it will work with the controller you currently have. Supported controllers include: SMXir, Passport I/O, Smart Touch, Elite II. 

- Waterline connections should be the same as the unit you are replacing, the CX unit has a standard 5/8" water connection.

- Dimensions wise the CTM CX is very similar to the above-listed Dometic and Cruisair split gas units, so there shouldn’t be any issues when replacing your current unit with the CX. However, it is recommended that you double-check your current installation space and the CTM CT’s specs in order to avoid any issues when installing.


The warranty period of registered CTM products is (2) two years, being the first year parts and labor, the second year parts only. For unregistered CTM products (1) one year, being the first 6 months parts and labor, and the last 6 months parts only. The warranty period of CTM products begins from the date of purchase (if purchased through a dealer or distributor), when installed  (if installed by an authorized CTM dealer) and/or at the time of possession of the vessel by the owner (for OEM installations). However, the warranty period shall not exceed (3) three years from the original manufacture date. CTM products include a serial number which is date-coded, in order to determine the manufacturer date of the product, you may contact CTM’s customer service to obtain the original date.

In the event there is an extended period of time between the date a CTM product is manufactured and the moment that the product goes into service, CTM will require proof of purchase. For unregistered products, a proof of purchase will be required as well. 

For more detailed information please download the Manual and refer to page 17.

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