CTM Marine Self-Contained CT Installation & User Manual
7
Product Description & Features
Thank you for purchasing our CTM Marine self-contained marine air conditioner. The CTM Marine
CT series are self-contained, direct-expansion, seawater cooled, reverse cycle air conditioners
designed for marine applications.
The CTM Marine self-contained marine air conditioner works by removing heat and moisture from
the cabin, which lowers the temperature and the humidity levels. At the same time conditioned air
is blown through the ducting system.
The blower fan draws warm humid air from the cabin across the evaporator where the heat from
the air is transferred to the refrigerant in the evaporator coil. The refrigerant then evaporates and
transforms from liquid to gas, absorbing the heat from the cabin air.
The compressor compresses the refrigerant gas and pumps it through the condenser coil. Seawater
is circulated through the inner tube in the condenser coil by the seawater pump which cools the
refrigerant and condenses into a liquid.
The heat absorbed by the evaporator in the refrigerant is then exchanged to the seawater and
discharged overboard. The liquid refrigerant is then passed through the evaporator coil again to
repeat the cycle.
The same process occurs for reverse-cycle heating, but backwards. The refrigerant flows in the
opposite direction through the reversing valve and heat is transferred from the seawater in the
condenser coil to the refrigerant and then to the air blowing through the evaporator.
Water temperature is crucial for the CTM Marine air conditioners to function properly. The system
will operate most efficiently in temperatures below 90ºF (32ºC) when cooling, and above 55ºF
(13ºC) when heating. The unit will operate at higher or lower seawater temperatures, but at a
reduced capacity. However, when seawater temperatures drop below 40ºF (5ºC) the system
operates at around 50% capacity. Anything below those temperatures will not work since the
pressure in the system will be so low that the unit will shut down in consequence a low-pressure
fault.
Refrain from altering the unit. Any alteration may cause malfunction, serious injury or deth. This unit
contains electric and heat connectors and sources. Alteration to any part of this unit may cause
exposure to toxic or harmful elements.
