Dometic MasterFlush 7640 Installation And Operating Manual page 15

MasterFlush7640
7.4 Winterizing
At the end of each camping season, or when the vehicle is stored for long
periods of time during which the toilet may be exposed to freezing tempera-
tures, the toilet system should be winterized for storage by using potable
water-safe antifreeze.
!
CAUTION!
 This toilet is not intended for use when exposed to tempera-
tures below freezing.
 Never use automotive-type antifreeze (ethylene glycol) in
freshwater systems.
I
NOTE
Use nontoxic antifreeze (propylene glycol) designated for potable
water systems. See vehicle owner's manual.
Non-toxic Antifreeze Winterization
1. Drain potable water tank and empty waste holding tank.
2. Add freshwater antifreeze to potable water tank according to mixture
instructions from antifreeze manufacturer.
3. Flush toilet several times until antifreeze mixture has flowed completely
through toilet, macerator pump and holding tank.
4. Turn off power to toilet.
Each installation is different, so antifreeze mixture amounts may vary. User
discretion is required to assure adequate protection.
I
NOTE
Never leave vehicle unoccupied for extended periods of time with
municipal water supply or onboard water pump turned on when
there is a possibility of freezing temperature.
EN
Maintenance and winterizing
15