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TIFFIN MOTORHOMES
Winterizing
To store your motor home for the winter months, it is necessary to winterize the water
system to help prevent freezing of this system. To do this, follow these instructions:
1. Drain all the water from the water system including the holding tank(s), the hot
water heater, and the water tank; also drain the optional water filter, if installed.
For the holding tank(s), open the gate valve(s) to drain the tanks. (NOTE: this
procedure is to be performed only at a wastewater pumping station to prevent
dumping of contaminated water elsewhere). For the hot water heater, remove
the outside cover and then remove the drain plug. When this tank is drained,
replace the drain plug and then replace the cover. For the water tank, open the
green-handled valve to drain the tank; then close the green-handled valve. If
an optional water filter is installed, remove the filter cartridge and store it in a
clean environment (e.g., resealable plastic bag); empty any excess water from
the filter housing and replace the housing.
2. Turn the by-pass valves at the water heater to the "bypass" position to prevent
filling the water heater tank
with antifreeze.
3. Disconnect the inlet connection to the water pump [in the sanitary service compartment under the motor home]
(Figure 13-17). Attach the supplied, vinyl hose (via the plastic coupling on the hose) to the inlet connection and
hand-tighten that connection; do not over-tighten. Note: Remember, the motor home also has an exterior
shower; therefore, this system must be winterized, as well.
4. Place the other end of the hose into a gallon of freshwater system antifreeze (one can refer to the local
Tiffin Motorhomes dealer or representative for the freshwater antifreeze formulation for your specific area).
NOTE: Do not use automotive antifreeze; use only antifreeze approved for RV applications; otherwise, damage
to the systems being protected may result.
5. Turn "on" the water pump to start the flow of the antifreeze. Turn "on" each faucet, one at a time, and allow
pure antifreeze to run through that piping. Let about one cup drop into the drains to protect the traps.
6. When all the antifreeze is withdrawn from the bottle, disconnect the clear vinyl hose from the
water-pump inlet connection and reconnect the inlet line to the water pump. (This may require more
than one gallon of antifreeze).
7. When the winterizing process is completed, turn the water pump "off" and then reconnect the water line. Store
the vinyl hose for future use.
8. Open the water supply valve that controls flow from the pump to the tank to help prevent freezing
on that water line.
Note: Remember, the motor home also has an exterior shower; therefore, this system must be winterized, as well.
!!!
–ALLEGRO®
Chapter 13
ROUTINE MAINTENANCE
Figure 13-16. Winterizing Process
for the Motor Home
13-33
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