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Modulating A/C System • Installation
Installation Procedures
This section covers the installation procedures for the
Cruisair Modulation System, including electrical connections
and SMXir control installation. Please read and understand
this manual before attempting to install any equipment.
Electrical System
Cruisair air conditioning systems are available for use with
common power supplies throughout the world. In the United
States and most of North and South America, the systems
are 115V or 230V, 60Hz, single phase AC (alternating
current). In Europe and most of Asia, power systems are
typically 230V 50Hz single phase.
The compressors used in Cruisair Modulating condensing
units are only available in 230V single phase, 230V 3-phase,
or 380/460V 3-phase. On 380/460V 3-phase units there is a
separate lower voltage circuit for the controls, either 115V or
230V. On some power systems this can be supplied by using
one input line and the neutral. If not, a separate control
power feed or a transformer will be required.
Running and starting loads of an air conditioning system are
often the largest electrical loads on a boat. It is important that
the power supply system is large enough to handle these
loads. Contact an electrician if you are not sure about the
proper wiring procedures. Always follow local and ABYC
codes for proper wiring guidelines.
Voltage and Frequency
The voltage rating of a unit is a nominal rating. The available
power supply voltage may be higher or lower by as much as
10% and the system will still operate properly. For example,
at 60 Hz, voltages my range from 110VAC to 120VAC, or
208VAC to 240VAC, or 440VAC to 480VAC. In a 50Hz
environment, common voltages range from 220V to 240V, or
380V to 415V.
When choosing a system, the voltage and frequency must
be known. While standard 60Hz equipment can often be run
at 50Hz, it will experience a 17% drop in performance.
However, 50Hz equipment can not be run at 60Hz because
the 50Hz motor will run too fast and become damaged.
Seawater pumps will lose even more performance at 50Hz
due to the nature of centrifugal pumps.
Dedicated 50Hz units will give full performance at 50Hz, and
should be used when the system is going to be run exclu-
sively at 50Hz. If a boat is traveling in 50Hz and 60Hz
environments, then 60Hz equipment should be installed, with
special attention to sizing (especially the pumps) so that the
system performs to expectations. When running 60Hz
L-0952 Installation
equipment at 50Hz, the voltage should be reduced by 17%
to prevent overheating a motor.
Installing The Condensing Unit
Ignition Protection Warning
Most Cruisair remote condensing units meet federal
requirements for ignition protection. However, there are
some condensing units, such as those with 3-phase
compressors, which are not ignition protected. Do not
install non-ignition protected units in spaces containing
gasoline engines, tanks, LPG/CPG cylinders, regulators,
valves or fuel line fittings. Failure to comply may result in
injury or death.
Selecting the Site
Cruisair condensing units are designed to be installed in any
convenient location. The unit is normally placed in the engine
room or other machinery space, but it can be located in the
living areas. The condensing unit will produce condensation
so a drain line from the drip pan is needed in these installa-
tions. The space around the unit can be insulated to reduce
noise if desired. The unit is internally cooled and does not
require ventilation. The location selected should provide for
access to refrigerant, seawater, and electrical connections
and be accessible for service. It should be installed on a flat,
horizontal surface away from direct spray from engine air
intakes or water wash-down.
Site Location Checklist
• Adequate space for access to refrigerant, seawater and
electrical connections.
• Accessible for service and maintenance.
• Flat, horizontal surface.
• Away from direct spray from engine air intakes or water
wash-down.
Mounting the Condensing Unit
Orient the condensing unit (Figure 1) so the refrigerant,
electrical connections and service ports are accessible. Use
the supplied "L" brackets to bolt the unit down. Fasten the
mounting base pan securely in such a way that the unit can
be removed for future service if need be.
Do not remove any covers, caps or fittings that may expose
any wiring or refrigerant. Only remove these items when you
are ready to complete the installation. Removal of any covers
may result in damage to the electrical components. Removal
of the caps or fittings may result in refrigerant loss.
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