Operation / Installation Manual – FCF 5,000, 9,000, 12,000, 16,000
Page 11
ELECTRICAL CONNECTIONS, GROUNDING AND BONDING
All a/c units have a terminal strip mounted inside the electric box. The terminal strip is labeled for proper
connections of the electrical supply, ground wires and pump circuits. A wiring diagram is provided in the electrical
box and later in this manual. The wiring diagram in the electrical box supersedes any found in this manual and
ABYC standards. The correct size circuit breaker should be used to protect the system as specified on the a/c
unit's data plate label. A minimum of 12 AWG boat cable should be used to supply power to the a/c unit and the
seawater pump. All connections shall be made with ring or fork terminals. Turn off a/c power supply circuit
breaker before opening electric box.
Each a/c unit installed requires its own dedicated circuit breaker. If there is only one a/c unit installed, the seawater
pump does not require a circuit breaker; the wiring from the seawater pump is connected to the terminal strip in the
electric box. If two or more a/c units use the same seawater pump, the pump wires will be connected to a pump
relay, Please refer to the wiring diagram. Electrical connections in the bilge and/or below the waterline should use
heat shrink type butt splices. Field wiring must comply with ABYC electrical codes. Power to the unit must be within
the operating voltage range indicated on the data plate. Properly sized fuses or HACR circuit breakers must be
installed for circuit protection. See data plate for maximum fuse/circuit breaker size (MFS) and minimum circuit
amperage (MCA). All units must be effectively grounded to minimize the hazard of electrical shock and personal
injury. The following can be observed: AC (alternating current) grounding (green wire) must be provided with the
AC power conductors and connected to the ground terminal (marked "GRND") at the AC power input terminal
block of the unit(s), per ABYC standard E-8, or equivalent.
1. Connections between the vessel's AC system grounding conductor (green wire) and the vessel’s DC
(Direct Current) negative or bonding system should be made as part of the vessel's wiring, per ABYC
standard E-9, or equivalent.
When servicing or replacing existing equipment that contains a chassis-mounted ground stud, the
installer must check the vessel's wiring for the existence of the connection required in item 1
above.
The a/c unit must be connected to the ship's bonding system to prevent corrosion due to
stray electrical current or voltage. All pumps, metallic valves and fittings in the seawater
circuit that are isolated from the a/c unit by PVC or rubber hoses must be individually bonded
to the vessels bonding system also. This will help eliminate any possibility of corrosion due
to stray current or voltage.
3 PHASE NOTICE
It is extremely important to ensure that wiring and phase sequencing of a three-phase power source is correct.
Marine wiring standards call for power source phases L1, L2, and L3 to be color-coded BLACK, WHITE, and RED,
respectively. These must be connected to the unit with the proper sequence; otherwise, it will not operate properly.
If the wiring sequence is incorrect, the unit's compressor (Scroll type only) and pump (if applicable) will run in the
reverse direction at a significantly increased noise level.
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