Grand Design Momentum, Owner'S Manual

Page: 114 / 220

112
Plumbing Systems
Water Control System
Your Momentum Fifth Wheel is equipped with a Nautilus P1
Water Control System . To understand the operation of your
water control system, please refer to the user instructions
included in this manual. See page 121 , Nautilus P1 Manual.
Draining and winterizing
If the RV is to be stored over the winter months, the water
heater must be drained to prevent damage from freezing. The
water heater should also be drained and bypassed during the
winterizing process particularly if introducing RV antifreeze into
the plumbing system.
Draining the Fresh Water System
The low-point drain valves release water in the supply lines by
opening the valves and all faucets. The water heater has its
own drain plug. To drain the permanent fresh water holding
tank and supply lines:
1. OPEN all faucets, including the outside shower.
2. OPEN the white fresh water holding tank gate valve.
3. OPEN red and blue low point drain valves in the outside
utility center.
4. DRAIN the sink by removing the drain cap .
5. Turn ON the water pump and allow it to run as needed.
6. Make sure the “ water heater bypass ” valve is set to
Normal (horizontal).
7. Relieve
the water pressure using the water heater P & T
( pressure & temperature ) valve BEFORE removing the
water heater drain plug.
• If any water pressure is present, water will spray out of the
opening when the drain plug is removed.
8. REMOVE the water heater drain plug.
When you are finished draining the fresh water system, reverse
these steps and, dump the grey and black water holding tanks
at an appropriate facility or according to local public codes.
After draining is finished, a small amount of water may remain
in the fresh water tank. This is normal.
Low-Point Drains
are located in the
Universal Docking Station