Marine Air Systems vector compact - Electrical Connections, Grounding and Bonding; Phase Notice

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 in this manual. 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 panel (PRP) which in turn has its own dedicated circuit
breaker sized for the pump (20 amp max). Please see the wiring diagram furnished with the PRP
(NOTE: PRP triac must have its mounting screw installed in order to dissipate heat). 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 branch circuit protection. See data plate for maximum fuse/circuit breaker size (mfs) and
minimum circuit ampacity (mca). All units must be effectively grounded to minimize the hazard of
electrical shock and personal injury. The following are to be observed:
1. 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.
2. 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.
3. When servicing or replacing existing equipment that contains a chassis-mounted ground stud, the
service person or installer must check the vessel's wiring for the existence of the connection
required in item 2 above.
ABYC standards are available from: American Boat and Yacht Council
3069 Solomon's Island Rd.
Edgewater, MD 21036 Telephone: (410) 956-1050
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.
FAILURE TO PROPERLY GROUND AND BOND THE SYSTEM WILL VOID WARRANTY!
3 PHASE NOTICE
It is extremely important to insure that wiring and phase sequencing of a three phase power source is
correct. Marine wiring standards call for power source phases LI, 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.