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Multi Ton Condensing Unit

FEATURES ---------------
High Efficiency Components
  • Reverse cycle condensing units available in voltages of 230 VAC, 220-240 VAC, 380 VAC and 460 VAC. Also available in 1o or 3o and 50Hz or 60Hz.
  • There are two different models in the series - CSP and CSM*. Each uses a different control.
  • High efficiency compressors and cupronickel/copper condenser coils provide maximum capacity with minimal amperage.
  • Expansion valve/check valve assemblies control load balancing during operation. Pressure switches and thermal overloads enhance system protection.
Symmetrical Base Design
  • Provides optimum space efficiency with 16"/41cm square footprint.
  • Allows ease in handling and positioning.
Electrical Box
  • Moisture resistant design
  • Box has remote mount capabilities with 6" harness.
  • Internal components are fully serviceable.
Integral Drain Pan
  • Allows for condensation removal.
  • Provides for internal fastening of unit.
  • Seam welded construction promotes structural integrity.
  • Two sets of vibration isolators reduce vibration and ensure quiet operation.
Quality Assurance
  • All surface components are constructed of or coated with materials resistant to fire and corrosion. Each unit is prime-coated with zinc chromate, then sprayed with a urethane finish.
  • Each unit is pre-charged, test run in all operating modes and leak checked.
  • Charge Guard© protection provides sealed access ports, ensuring environmental protection and system integrity.
  • All units meet or exceed applicable ABYC and U.S. Coast Guard regulations, CE Directives and general Air Conditioning and Refrigeration Industry (ARI) standards.

*'C" at the end of model number denotes cool only.
Example: CSP24K-C
'Z' at the end of model number denotes 230V.
Example: CSP48K
** P = Passport Control M=Manual Control
*Ratings at 60Hz. 50Hz operation will be diminished by 17%. Fully rated 50Hz. equipment is available for 220/240 VAC operation.



Model CS*24K CS*30K CS*36K CS*48K CS*60K
Capacity (BTU/H)
Electrical Data
24,000 30,000 36,000 48,000 60,000
Voltage (VAC) 230VAC/60HZ/1o 230VAC/60HZ/1o 230VAC/60HZ/1o 230VAC/60HZ/1o 230VAC/60HZ/1o
FLA (Full Load Amps)
Cool 8.1 10.2 11.2 15.4 20.8
Heat 9.4 10.9 13.0 17.8 24.0
LRA 60 73 81 105 147
Max. Circuit Breaker 40 50 50 80 105
Min. Circuit Ampacity 23 29 30 45 60
Physical Data (in/cm)
Length 16/40.6 16/40.6 16/40.6 16/41 24/61.0
Width 16/40.6 16/40.6 16/40.6 16/41 12/30.5
Height 18/45.7 18/45.7 22/55.9 22/55.9 25.3/64.4
Water Inlet/Outlet 5/8"o 5/8"o 5/8"o 5/8"o 5/8"o
Base Condensation Drain 5/8"o 5/8"o 5/8"o 5/8"o 5/8"o
Base Valves (discharge x suction) 3/8 x 5/8 3/8 x 5/8 3/8 x 3/4 3/8 x 3/4 5/8 x 7/8
Refrigerant (oz/kg) 46/1.3 50/1.42 56/1.58 76/2.15 80/2.26
Weight (lbs/kg)
Net 126/57.3 135/61.4 160/72.7 173/78.6 197/89.5
Ship 131/59.5 140/63.6 165/75.0 180/81.8 205/93.0
Electrical Box (in/cm) CSM CSP
Width 11.06/28.1 11.00/27.9
Depth 12.63/32.1 12.63/32.1
Height 3.50/8.9 3.50/8.9
 Control MCP Passport
Installation Guidelines for Multi Ton Condensing Unit

When choosing the proper model Central System Multi Ton Condensing Unit, primary consideration should be given to calculated BTU loads and available power supply. Special consideration should be given in determining the reverse cycle heating capacities under anticipated conditions. Reverse cycle operation is affected by the sea water temperature. As it decreases, the units heat transfer capacity also decreases and proportionately affects the output of warm air. It is not recommended that the unit be operated in the heat cycle with water temperatures below 40 ° Fahrenheit.

The location of the condensing unit should be dry and accessible for service, and provide the most direct routing of refrigerant line sets relative to the evaporator location(s). The vibration isolated condensing unit should be secured to a horizontal shelf that is designed for the weight of the unit and torsion loads from the vessel's movement. The remote electrical box may be fastened to a bulkhead using the hardware provided.

Refrigerant-grade copper tubing should be properly sized for the specific application. Both the suction and liquid lines should be insulated separately with approved closed cell foam jackets (i.e.. Rubatex 1/4" wall thickness). The refrigerant line ends should remain capped until the actual connections are made to prevent contamination. Tube benders are recommended to prevent kinks in the tubing, which will adversely affect the performance and longevity of the system.

When using the multiple evaporators with one condensing unit, locate all unions and tee fittings properly in areas accessible for service. Use approved flaring technique and refrigerant grade components for all connections.

Insulate fittings using cork insulation tape or foam tape (only after system has been leak-checked). Wrap fittings sufficiently to equal R-value of tube insulation. Reinforced marine grade hose should be used for the sea water circuit. All hose fittings should be double clamped. The hose should be routed upward from the thru hull intake to the condensing unit to prevent air locking and provide draining of the sea water circuit. The condensation drain should be connected and routed downward to a proper sump or overboard discharge.

All circuit breakers and wire gauge must be sized according to marine design standards. Only stranded tinned copper wire should be used. All equipment must be properly grounded.

The installed line sets and evaporator(s) must be evacuated to remove air from these components and prevent moisture acidity formation. All connections should be properly leak-checked upon releasing the refrigerant charge from the condensing unit into the system. If the system is to be opened for any reason at this point or for future service, the refrigerant charge must be "pumped down" back into the condensing unit or recovered to prevent it from escaping into the atmosphere.

In the interest of product improvement, Marine Air Systems' specifications and design as outlined herein are subject to change without prior notice.

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