MJM Yachts 29z Outboard - Manual (Page 31)

CHAPTER 9 GRAY WATER SYSTEM
- 31 - 29z
9.1 GENERAL
Gray water is liquid that can legally be pumped overboard, generally from sink drains, shower
drains, and bilges. Your boat also directs deck run-off to of all gray water through common drains
(port & starboard) in the transom.
9.2
GRAY WATER SUMP
The gray water sump box aboard your boat is located in the bilge under the bottom
companionway step. This collects water from the shower drain, the refrigerator drain, and the air-
conditioning condensate (if fitted). The sump pump switch on the DC panel operates a bilge pump
with normal float switch to empty the sump when any of the above systems are in use.
Periodically, the cover of the tank can be removed and the contents cleaned.
9.3 BILGE
PUMPS
There are three bilge pumps fitted on your boat.
The manual bilge pump under the starboard helm station is operated by opening the plastic
cover, inserting the handle, and pumping up and down. There is a noticeable difference when the
bilge has run dry. This pump is most often used as a back-up system to the two automatic
pumps. Its capacity is 15 gal/min.
The automatic pumps, located forward of the engine and under
the companionway steps, are wired directly to the house battery
bank. This means that even when the main battery switches are
OFF, the bilge pump can continue to function properly. A three-
way switch controls the pumps. When held in the manual
position, the pump will work regardless of whether there is water
in the bilge or not. In the OFF position, the pump will not turn on.
In the AUTO position operates if the water level rises. If water is
detected, the pump continues to run until the water is gone.
Generally, the pump should be left in the AUTO position.
9.4 COMMON
DRAINS
To eliminate unnecessary thruhull penetrations in the topsides, a
common drain system is utilized both port and starboard to pick
up the cockpit hatch drains and side-deck run-off drains.
BILGE PUMPS