7-9
SECTION 7 –
PLUMBING
Method 1 – Blow Out Procedure
(Drain and purge waterlines using
compressed air)
1. Level the Motorhome. If the motorhome is
not level, there may be “low points” in
waterlines that can trap water in the lines and
prevent it from draining properly.
2. Drain Fresh Water Tank and Waterlines.
Open all waterline drain valves and drain
fresh water tank. (See “Water System Drain
Valve Locations” chart at the end of this
section for locations of drain valves on your
model).
3. Open Faucets. Turn on the water pump and
open all sink faucets and shower head knobs.
Leave open after water stops flowing.
4. Drain Toilet. Press the toilet flush pedal and
hold until water stops flowing in the toilet.
Then turn water pump switch off.
5. Drain Water Heater. Turn off the water
heater power switch before draining the water
heater tank to avoid damage to the heating
element. Drain the water heater by removing
the plug from the base of the water heater tank,
accessible from the outside of the motorhome.
(Requires socket and ratchet).
• Also, open the Pressure-Temperature Relief
valve at the top right portion of the tank to
prevent air locking in the tank while
draining.
6. Connect Air Pressure. After water has
stopped draining at all faucets and drain
valves, leave faucets open and connect a
“blow-out” plug to the city water connection
on the motorhome. Then use a compressed air
hose regulated to 30 psi or less to force air
through the system. A “blow-out” plug can be
purchased at any Winnebago Industries
®
dealer.
Water Heater Drain Plug
(Remove with socket)
Hot water can escape from tank causing
injury. Operate relief valve or remove
drain plug only when the tank water is
cold.
Pressure-Temperature Relief Valve
(Lift handle only when water heater is cold)
Fresh Water
Inlet
Blow-out
Plug
Air Hose
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