chilled water
Product Description
Modular chilled water (MCW) units are available in capacities ranging from 24,000 to 180,000 BTU/H. MCW’s are available in single
phase or three phase, 50Hz or 60Hz, and all standard voltages (208, 230, 380, 460 VAC). Modules can be staged together to provide
a larger system, which is easily retrofitted and serviced in the field. A maximum of six 15 ton stages could be configured for a total of
1,080,000 BTU’s or 90 tons. Each refrigerant circuit is hermetically sealed and factory pre-charged with R-22 (407C is optional). Each con-
densing unit is monitored and protected with freeze controls, high limit switches, high and low aquastats, and timers. These condensing
units can be installed in any convenient location and are unaffected by vibration, moisture or ambient temperatures up to 140°F/60°C.
Features
Innovative Modular Design
• Compact base design and footprint allows flexibility in
space usage and layouts.
• Lightweight aluminum construction provides corrosion
resistant durability and enhances ease of installation.
• Individual modules can be multiplexed to provide pre-
cise capacity requirements for any application.
• Factory assembled vertical and horizontal multiplexed
configurations are available with frames, manifolds and
controls.
• Remote-mountable electrical box allows easy access
for adjustments or service.
High Efficiency Components
• Matched components provide full rated capacity and
assure maximum performance.
• Bi-flow expansion valves balance systems between
heat and cool modes.
• Compact stainless steel brazed plate heat exchangers are
designed for maximum efficiency using minimum space.
• Condenser coil is constructed of spiral fluted cupronickel
to provide maximum heat transfer and high corrosion
resistance.
• Exclusive Digital Diagnostic Controller (DDC) monitors
and protects the system through the use of aquastats,
pressure switches, timers, freeze controls and high limit
switches. All programmed to read out on an LED panel
for immediate diagnosis.
• Standard models operate at 60Hz and 50Hz. Models
are available to operate at voltage, frequency, and
phase combinations to suit customer needs.
• Frames are welded with marine grade aluminum alloy,
primed, then finished with a corrosion resistant epoxy.
Quality Assurance
• Each unit is pre-charged, load tested and calibrated at
the factory.
• 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 S E R I E S
Conditioning and Refrigeration Industry (ARI) standards.
Specifications
Model Capacity MCW24-*RC MCW36-*RC MCW48-*RC MCW60-*RC MCW72-*RC MCW90-*RC MCW120-*RC MCW150-*RC MCW180-*RC
Cool BTU/H 24,000 36,000 48,000 60,000 72,000 90,000 120,000 150,000 180,000
Cool Kcal/H 6,048 9,072 12,096 15,120 18,144 22,680 30,240 37,800 45,360
Reverse Cycle BTU/H 26,400 39,600 52,800 66,000 79,200 99,000 132,000 165,000 198,000
Reverse Cycle Kcal/H 6,653 9,979 13,305 16,632 19,958 24,948 33,264 41,580 49,896
Est. Net Weight (lbs/kg)(1) 107/49 107/49 154/70 176/80 180/82 310/141 390/177 480/218 600/272
Est. Ship Weight (lbs/kg)(1) 194/88 194/88 241/109 263/119 267/121 410/186 500/227 600/272 715/329
* S= Scroll (available in 2-15 ton), R= Reciprocating (available in 2-5 ton, 5 ton at 60Hz only).
(1) Weights shown are for modules using scroll compressors rated at 60Hz, see MCW spec sheet for additional information.
L-2137
Installation Guidelines for the MCW Chiller Series
When choosing the proper model MCW Chiller condensing unit, All circuit breakers and wire gauge must be sized according to
primary consideration should be given to calculated BTU loads and marine design standards. Only stranded tinned copper wire should be
available power supply. Any special requirements (capacity modifications, used. Route all wiring through the strain-relief connectors provided in the
voltages, cycles, auxiliary heat, etc.) should be determined prior to ordering. electrical boxes. All equipment should be properly grounded and bonded
The location of the MCW Chiller condensing unit should be dry and using the lug provided on each unit’s chassis. Electrical boxes are
accessible for service. Secure the condensing unit to a level horizontal pre-wired for power and control circuits. Electrical boxes can be remote
surface with the supplied brackets. These brackets are designed to hold mounted in a convenient location with the standard five foot harness.
the weight of the equipment as well as handle any torsional movement. Field wiring is required between remote switch and unit electrical box.
If a Marine Air Systems frame base is supplied and the chillers are already All chilled water condensing units use closed-refrigerant circuits,
mounted, secure by drilling through the frame base at convenient locations. pre-charged with R-22. No additional refrigerant is required during the
Do not stack units directly on top of each other. Each condensing unit must installation or at initial start-up and operation of the system. Refer to other
be independently supported. individual component sheets for specifications and details of air handlers,
Reinforced marine grade hose is to be used for the seawater circuit. controls and related parts. In keeping with regulations set forth by the EPA,
The hose is to be routed upwards from the thru-hull intake to the condens- only certified technicians should perform service on, or make adjustments
ing unit to prevent air locks in the centrifugal seawater pump. Circulation to, any refrigerant circuit.
connections between the condensing unit and chilled water lines are to be Never install your air handler in bilge or engine room areas. Insure
made with properly sized fittings and reinforced marine grade hose. All hose that the selected location is sealed from direct access to bilge and/or
connections are to be double clamped. Ball valves should be installed at engine room vapors. Do not terminate condensate drain lines within four
chilled water inlet/outlet of each MCW unit and each air handler for overall (4) feet of any outlet of engine or generator exhaust systems, nor in a
serviceability of system. Insulate all hose and fittings properly upon comple- compartment housing an engine or generator, nor in a bilge (vapors can
tion of leak tests to prevent condensation and energy or capacity loss. travel up the drain line), unless the drain is connected properly to a sealed
The chassis has an integral condensation drain pan for removal of condensate or shower sump pump. Failure to comply may allow bilge or
any water that may form. Secure a hose to the drain pan spud and route it engine room vapors to mix with the air handlers return air and contaminate
downward to a proper sump or overboard discharge outlet. living areas.
In the interest of product improvement, specifications and design as outlined herein are subject to change without prior notice.
Dometic Environmental Corporation Sold and Serviced by:
2000 N. Andrews Ave. Ext. • Pompano Beach, FL 33069-1497 USA
Phone: 954-973-2477 • Facsimile: 954-979-4414
P.O. Box 15299 • Richmond, VA 23227-0699 USA
Phone: 804-746-1313 • Facsimile: 804-746-7248
For Sales and Service calls within Europe and the Middle East,
please contact: +44 (0) 870 330 6101
Email: sales@marineair.com • Website: www.marineair.com
Revised: 08-16-06 L-2137
