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This method uses compressed air to blow out any remaining water in the system after ini-
tially draining water using drain valves.
1. Turn o water heater gas valve typically located outside the RV. Water heater power
should be OFF (both ELECTRIC & GAS switches). (Turn o power to the tankless
water heater if equipped.)
2. The Uni-Doc utility center has no dedicated water heater bypass valves. This function
is built into the utility center.
3. Level the RV and drain the fresh water tank, the tank (storage) water heater and the hot
and cold water lines. Open all low point drains and the fresh water tank drain. Faucets
inside the RV should be opened to relieve pressure to allow water lines to drain. Refer
to Draining the Fresh Water System section.
4. Remove the drain plug from the tank (storage) water heater located outside the RV
5. To drain a tankless water heater (if equipped),
open water faucets and use compressed air at
the City Water Connection on the utility center.
There is no drain plug.
6. Water lter should be removed for winterizing.
See Water Purication System section. Your
RV may have one of two types of lters:
Remove the can-
ister, take out the lter and then re-attach the
empty canister.
Remove the cartridge
lter and replace it with a bypass hose (supplied
with your RV).
7. Turn the (color) valve handles to the POWER-
FILL position.
8. Low point drains should be open to remove wa-
ter in the lines.
, 4 colored valves (WHITE,
RED, GREEN, BLUE) be set to 45° or damage may occur to the util-
ity center.
Never apply air pressure to the water system with any of the valves in the
closed position. Air pressure applied to a closed valve, faucet or low point
drain could potentially damage the seals and cause water leaks. If you have
questions, consult your RV dealer. Using RV antifreeze is the preferred meth-
od of winterization.
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