sufficient amount to properly locate the box when installation is completed. Follow the
same installation procedure for this circuit breaker as with the 20 amp air conditioning
unit circuit breaker described earlier in the Installation Section of this manual.
WARNING
THE PUMP RELAY BOX MUST BE IN A DRY NON-EXPLOSIVE
ENVIRONMENT. EXPOSURE TO EXPLOSIVE MATERIALS OR VAPORS
MAY CAUSE EXPLOSION RESULTING IN SERIOUS INJURY, DEATH, OR
DESTRUCTION OF THE BOAT. EXPOSURE TO WATER COULD CAUSE
ELECTRICAL SHORTING RESULTING IN FIRE AND DESTRUCTION OF
THE BOAT.
3. On the outside of the Pump Relay Box are two terminal boards. One terminal board is
WHITE and will be used to connect the 115 (220) vac input power from the pump circuit
breaker. The other terminal board is BLACK and will be used to connect the 24 vac
control voltage from each air unit to the Pump Relay Box relays located inside the box.
(When using the Mermaid FX-1 control, a 110v relay coil is used. A 110v to 110v
relay box is required. Contact the Mermaid factory for details)
4. The BLACK terminal board will have two "GRAY" cables connected to it from the
factory. Each of these cables has an internal "WHITE" and "BLACK" wire. Route one
of these "GRAY" cables to each of the air units. It is not important which cable goes to
which air unit. (Again, separate instructions are provided when the Mermaid FX-1
Thermostats are used.)
5. At the air conditioning unit, on the outside of the air conditioner Electrical Box, there
is a BLACK terminal board. Connect the "BLACK" wire in the "GRAY" cable to the
"B" terminal on this board. It is the terminal on the far right as you face the terminal
board.
6. Remove the cover from the Electrical Box by removing the three retaining screws
located on each side of the box. The cover slides off. Inside the box, locate the contactor
relay which is black in color and is mounted in the top right of the box.
7. Now run the "WHITE" wire from the "GRAY" cable through the black plastic
grommet located directly below the BLACK terminal board into the air unit Electrical
Box. Locate the 24 vac "YELLOW" wires on the side of the contactor relay and "piggy
back" the Pump Relay Box "WHITE" wire to one of the "YELLOW" wires.
8. Replace the cover on the Electrical Box being careful not to pinch any wires in the
cover and replace the cover retaining screws. All wiring is now complete at this end.
9. Repeat this same operation at the second air conditioning unit.
10. Return to the Pump Relay Box.
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