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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 Systemsection
4. Remove the drain plug from the tank (storage) wa-
ter 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 canis-
ter, 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).
4 colored valves (WHITE,
RED, GREEN, BLUE) MUST 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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