This is an example of a Custom Dual Holding Plate System

Complete CoolBlue Refrigeration System:

  • Fin/Tube holding plate with preset expansion valve custom configured to fit your box
  • Holding plate mounting brackets
  • DC condensing compressor unit operating on 12v or 24v
  • 12ft copper tube sets with Aeroquip self-sealing connector ends (custom sizes available upon request)
  • Thermostat with mounting bracket
  • The ONLY 5 Year Warranty in the Marine Refrigeration Business with 7 Day a week Customer Service
  • LED Digital remote Temp display

$3,150 List Price

COOLBLUE holding plate refrigeration systems are as reliable as your land based 120v kitchen refrigerator, while using half the daily amps of other 12v refrigeration systems. Utilizing the latest technology in variable speed compressor design, low amp 12v fan, over sized condensing coil, and holding plate with preset expansion valve. COOLBLUE operates simply and efficiently, eliminating the complexity and excess power associated with water-cooled systems. While other 12v systems require water cooling at temperatures above 90F, COOLBLUE operates at ambient temperatures up to 120F without a loss in system efficiency. All Technautics modular refrigeration systems are built, pre-charged with 134a refrigerant, and pre-tested prior to shipping and are cruiser installable and serviceable without any special tools, gauges or refrigeration experience.

CoolBlue Advantages

  • 45 YEARS of Marine Refrigeration Experience SINCE 1968!
  • COOLBLUE uses 1/2 the power as other 12v Systems
  • 24AH/Day for a 7 cubic foot fridge/freezer with R-30
  • Offers the only 5-year warranty due to the robust design
  • No refrigeration technician or experience needed
  • Stainless steel holding plate resists corrosion and leaks
  • No water cooling needed even at ambient temps of 120F
  • COOLBLUE systems are pre-charged, pretested and built in Escondido, California USA.
CoolBlueEvaporator Systems
WATER COOLINGNot needed, even at 120 ° F (50 ° C)Required at temperatures over 90 ° F (32 ° C)
ALTERNATE AIRNot neededSuggested
in a 7 cubic foot (200 liters), R-30 box
24 amp hours/day48 amp hours/day
in a 7 cubic foot (200 liters) box
1/3 freezer,
2/3 refrigerator
120 pounds of frozen food
12 pounds of frozen food
from compressor to box
2-50 foot
customized per order
9 foot only
PLATEStainless SteelAluminum, thin & easily punctured,
susceptible to corrosion
SERVICEABILITYSite glass and service ports provided,
serviceable by owner
No service ports provided,
only serviceable by refrigeration technician

How The Refrigeration Loop Works

The first known artificial refrigeration system was demonstrated by William Cullen in 1748. But relax, it’s not completely necessary understand the Physics of the basic refrigeration loop to enjoy the benefits of cold beer and ice cream aboard your boat! But for the scientifically inclined it sure is “cool” (that’s a science nerd joke I couldn’t resist).

The flow chart (left) represents the basic CoolBlue refrigeration system.
Starting with the pressurized liquid refrigerant ahead of the fin/tube holding plate evaporator at Point A, the introduction of liquid refrigerant is regulated by a thermally adjusting expansion valve (TXV) that is controlled by temperature and pressure. The pressurized refrigerant is reduced in pressure across the expansion valve from high pressure (Point A) to the fin/tube evaporator holding plate pressure (Point B). The expansion valve acts as a boundary between the high and low-pressure sides of the system and uses the holding plate exit refrigerant gas temperature to throttle in more or less liquid refrigerant.

Once inside the holding plate, the low-pressure refrigerant evaporates and absorbs heat from the eutectic solution. The refrigerant liquid and vapor passing through the fin/tube holding plate evaporator coil continues to absorb heat until it is completely evaporated and turns into gas (Point C). The now heated gas is drawn through the suction line to the compressor suction (Point D). The increased pressure produced in the compressor causes the gas to compress and heat and flow into the condenser (Point E). In the condenser heat is removed causing the refrigerant gas to condense back to a liquid refrigerant form. The liquid refrigerant is collected and stored in the filter/drier (Point F) and is available to begin the cycle again. The thermostat (G) is monitoring the temperature of the holding plate and turning the compressor on/off to ensure that the eutectic solution is never allowed to defrost and undergo a phase change from solid back to liquid.

What Our Customers Are Saying

“Of all the machinery I have on my boat, SUNDANCE, your fridge has been trouble free for the three years I have had the boat. If all my machinery worked as well, there would be a lot of mechanics out of work. Thanks for a great product.”
– Cliff Hagerman

“Before the old compressor stopped working, it was drawing 10-12 amps. To our delight and surprise, the new one only draws 3.5 amps. The solar panels stay well ahead of it, and it’s been on for 3 months. Cold beer and ice cubes while anchored in Tenacatita Mexico! “

– Carl & Robinn

“Technautics, after trying several brands of cold plates with no satisfaction, we purchased a Technautics Coastal coldplate from West Marine. We cruised the Bahamas and the east coast of the U.S. last year in out Hardin 45 with no refrigeration problems.”

– Steve & Val Papkey

“After much deliberation, I decided to purchase a Cool Blue 12 volt, air cooled, holding plate refrigeration system from Technautics. To say that I am pleased with the system, would be an understatement!! The system is performing very well. Everything placed in the freezer is frozen solid, the temperature in the freezer seems to stay right around 10 degrees. The spillover system is keeping the refrigeration portion at approximately 40 degrees with the spillover opening shut. would highly recommend anyone considering replacing or adding refrigeration to take a good look at this system ! I am not in any way affiliated with Technautics and only pass this information to the list based on my personal experience. I almost forgot the most important thing!!! I now have solidly frozen ice cream!!!!!!

– Ken & Bonny Taggart

“Randy, We have finished the installation of our “Cool Blue” and are extremely happy. We have 4 cu ft of freezer and 4.6 cu ft of refrigerator and have reached -17F in the freezer! We found that keeping the dial at 2 keeps the freezer just above zero and the fridge about 40!”

– Ken & Bonny Taggart

“I started the unit up first time this am. I set it at 4 on the dial and it was pulling 7 amps at 72°. By the time I let at 8pm to go back home it was down to 4 amps and 9 and still falling. I am very happy with it! Thanks for making our summer vacation more fun!”

– Terry & Marie

“Thank you for being so responsive to my concerns regarding the CoolBlue system. I am most impressed with your attention to detail and customer service. Please use the enclosed check to take your crew to Wahoo’s for fish tacos and brewskis on me.”

– Tom

To download a copy of the CoolBlue manual with technical specifications
along with detailed installation and operation instructions, click the button on the right.

Or call and talk to the owners of the Company and the Designers & Builders of the COOLBLUE Refrigeration system, Rich and Charlie, 7 Days-A-Week. If they are awake, they answer!