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Sanitizing/Winterizing the Plumbing System
Most models have a factory installed water heater bypass that enables you to avoid lling the
water heater with RV antifreeze. The 3-Valve Bypass typically located in close proximity
to the water heater.
In the 3-valve bypass diagram, valve D is the fresh water
tank shutoff. Valve E is used to introduce RV antifreeze into the lines
when winterizing the system and has a clear hose attached to it. See
Winterizing the Plumbing System. Valves D and E are typically
located near the water pump, which may be under a dinette bench,
kitchen island, or bed.
4. Open the “low point drains” by turning, then pulling the handles up. They are installed
at the lowest point of the water lines. A label is placed on the outside of the RV to
indicate where the drains are located. The drains will need to be operated from inside
the RV. Once the label is found on the exterior sidewall, the drains will be found at a
corresponding location in the interior.
5. Drain the sink by removing the drain cap.
6. Turn ON the water pump and allow it to run as needed.
7. If the RV water heater has bypass valves, set them to the BYPASS conguration (refer
to the Water Heater Bypass section).
8. Operate the toilet ush lever until water stops owing.
9. Relieve the water pressure using the P&T valve BEFORE removing the water heater
drain plug. If there is any water pressure present, the water will spray out of the open-
ing when the drain plug is removed.
When you are nished draining the fresh water system, reverse these steps and dump the
grey and black water holding tanks. It is normal for some liquid to remain in the fresh water
tank after drainage procedure.
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