AC SYSTEM
The 420 Premiere AC electrical system runs on
240V/50 amp shore power system. It is important
that you become knowledgeable about the Main
Distribution Panel in the port salon (Figure 7. 8).
The manufacturer’s operation manual covers
detailed information for operating the air conditioner
including temperature setting, display and calibra-
tion, and fan speed and calibration. Also provided
are technical data and troubleshooting information
to help you keep the unit in safe and proper operat-
ing condition.
Note: Actual usage of equipment will depend on the
amperage output of the power source available.
Line voltage from the generator or shore power is
shown by the voltmeters on the main distribution
panel. The ammeters indicate amperes being drawn
through the selected power source’s circuit breakers
on the main distribution panel.
The main distribution panel main breakers are
equipped with a source selector slide to prevent the
generator and shore power from being energized at
the same time and damaging the electrical system.
Both breakers must be in the OFF position before
switching to an alternate power source.
The 240 volt system wiring consists of four color-
coded wires. The black and red wires are the “hot”
feeds, the white is the common, or neutral, and the
green wire is the safety ground. The shore main cir-
cuit breakers protect the black and the red hot feed
and neutral wires. All 240 volt branch breakers and
switches for AC equipment are installed on the “hot”
wires. The green conductor of the shore power is
connected to galvanic isolator.
The green conductors on board the boat are con-
nected to the AC grounding bus behind the main
distribution panel.
The 120 volt wiring installed on Chaparral boats
consists of three (3) color-coded wires. The black
wire is the “hot” feed, white is the common, or neu-
tral, and the green wire is the ground. All branch
breakers and switches for AC equipment are
installed on the “hot” wire. The green conductors on
board the boat are connected to the AC grounding
bus behind the salon main distribution panel.
The main breakers may trip if there is a surge in line
voltage, an electrical storm or onboard system over-
load.
7-8
DANGER:
Extreme Hazard – Swimming near a
boat operating on an AC electrical system can lead
to severe shock and death. Never swim or allow
anyone to swim when the AC system is in use.
WARNING:
Never override the source select
system.
WARNING:
Never operate 240 volt shore
power at less than 208 volts.
WARNING:
Never operate 120 volt shore
power at less than 110 volts.
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