Dometic 8900 Series Operation Manual page 9

SeaLand MasterFlush Toilet
7.4 Winterizing
At the end of each season, the SeaLand MasterFlush macerator toilet should be winterized for
storage by using potable water-safe antifreeze (if boat or vehicle will be exposed to freezing
temperatures) .
Note
Use nontoxic antifreeze (propylene glycol) designated for potable water systems . (See boat
or vehicle owner's manual .)
Caution
Never use automotive-type antifreeze (ethylene glycol) in freshwater systems .
PRESSURIZED FRESH WATER SYSTEM
1 . Drain potable water tank and empty holding tank .
2 . Add freshwater antifreeze to potable water tank .
3 . Flush potable water antifreeze and water mixture through toilet(s) and into entire system,
including the waste holding tank, diverter valve connections, discharge pumps, etc . Turn off
power to toilet .
Each installation is different, so amounts may vary . User discretion is required to assure
adequate protection .
RAW WATER SYSTEM
Parts required:
1 . Close intake and discharge seacocks . See Hazard of Flooding risks in this manual .
2 . Turn off power to toilet .
3 . Disconnect and drain intake hose, discharge hose, and in-line filters .
4 . Connect 0 .625 in . (16 mm) ID hose to raw water pump intake and 1 .5 in . (38 mm) ID hose to toilet
discharge .
5 . Place one container under hose connected to toilet's discharge .
6 . Place hose connected to intake pump into bucket with antifreeze and pour antifreeze in other
container .
7 . Turn on power to toilet and flush until antifreeze is removed from toilet .
8 . Disconnect power to toilet and reconnect all intake and drain hoses .
• 1 .5 in . (38 mm) ID hose, about 3 ft . (1 m) long
• 0 .625 in . (16 mm) ID hose, about 3 ft . (1 m) long
• two containers
Maintenance, winterizing
9