Dometic SeaLand MasterFlush MF 7200 Series Operation Manual page 10

Dometic MasterFlush
7.4 Winterizing
At the end of each season, the Dometic macerator toilet should be winterized for storage by using
potable water-safe antifreeze (if boat or vehicle will be exposed to freezing temperatures) .
If system will be subjected to freezing temperatures, please follow procedures in section 7 .3,
"During extended periods of non-use", and then winterize system as described here .
Note
Use nontoxic antifreeze designated for potable water systems . (See boat or vehicle
owner's manual .)
Caution
Never use automotive-type antifreeze 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 .
SEA 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 and in-line filters .
4 . Connect hose to sea water pump intake .
5 . Place hose connected to pump intake into bucket with antifreeze in it .
6 . Turn on power to toilet and flush until antifreeze is removed from toilet .
7 . Disconnect power to toilet and reconnect all intake and drain hoses .
10
• Hose that fits sea water pump, about 3 ft . (1 m) long
• one container