Grady-White Boats Canyon 456, Manual, Page: 68 / 90

8-8
Chapter 8: Canyon 456
Raw Water Systems
C A U T I O N
All seacocks should be in the “closed” position if not in use or if the boat is unattended for an
extended period to prevent the taking on of water if a plumbing component fails.
Seachest
The Canyon 456 is equipped with a 7 gallon raw water reservoir plumbed to a 2�5” seacock that
can be operated remotely with the seachest seacock switch in the cabin�� This seacock and seachest
supply water to all of the accessories that require raw water for operation, eliminating the need for
multiple seacocks� The seachest has six outputs, each going to separate components (Port and
Starboard Livewells, Air Con/Cooler Box Pump, Seakeeper, Raw Water Washdown, Generator)� To
avoid pressurizing the system, the seachest is vented to a fitting on the aft deck, forward of the
engines� Please contact your dealer for any specific questions about this system�
C A U T I O N
The seachest seacock must be open before operating any accessory that requires raw water.
Note: See page 6-5 for proper maintenance of the Seachest�
Seacocks
The Canyon 456 is equipped with two electric seacocks, which can be operated remotely by the
seacock switches in the cabin switch panel, by a valve control box, as well as manually� One of the
seacocks is for the raw water system and one is for the discharge of the holding tank� The raw water
seacock is located under the access hatch in the floor of the aft rigging area� The discharge seacock
is located behind the access panel in the head on the starboard side, outboard of the toilet� To
operate these seacocks remotely, use the seachest and discharge seacock switches in the cabin
switch panel to operate the seacocks remotely� To operate these switches, press the side of the
switch labeled “open” or “close” to move the seacock handle to that position� When operating the
seacocks, wait 30 seconds to allow the seacock handle to cycle� The switch will illuminate green for
open or red for closed when the cycle is complete� The valves can also be operated from the black
control boxes equipped on the 456� These boxes can open and close the seacocks as well as detect
high water in the bilge� The box for the raw water seacock is located on the starboard side of the aft
rigging area� The control box for the discharge seacock is located in the same rigging area as the
valve, outboard of the head�
Air Con/Cooler Box Pump
This pump supplies water to the helm air conditioner,cabin air conditioner, and cooler box
condensing unit� It receives a signal from the pump relay for these units when they are operational�
CZone supplies power automatically to the pump relay when any of these accessories are turned
on�