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Maintenance
Plumbing
Water System (Self-Contained)
The fresh water system consists of a city water hookup,
fresh water tank and drain valve, water pump, hot
and cold water lines, hydronic heating and hot water
system, and faucets. Full explanations on the locations
and use of these features are explained in this section�
Before using the water system, check that the water
heater bypass valve is turned to the use position� Make
sure the fresh water tank drain valve is closed;
Volt Model Schematic on page 9-26�
The water tank can be filled by connecting a potable
water hose to the city water inlet and turning on the
fresh water valve switch� A high-pressure RV/Marine
FDA approved drinking water hose of at least ½-in�
diameter made from material that is tasteless, odorless,
and non-toxic should be used� It's a good idea to let
the water run through the hose for a short time to flush
it out. RVers sometimes fill their tanks with "home"
water to avoid strange water that may be distasteful to
them on short outings. Remember, the more water you
carry in the Fresh Water tank, the less cargo carrying
capacity you have for other items� The amount of water
in the tank may be checked on the Multiplex Control
Panel� The fresh water valve switch will automatically
turn off when the tank is full�
Because the water heater is tankless, it does not need
to be filled. However, if the system has not been used
for some time or is being used for the first time since
draining the lines it is normal for air to have gotten into
the lines. To expel the air, open the hot side of either
the galley, wet-bath, or exterior shower faucet and turn
on the water pump or connect to an exterior city water
source� Close the cold side of all faucets� For some
time the open faucet will only sputter� This is because
the air is being pushed out through the lines� Once the
air is expelled, a steady stream of water will come from
the faucet�
Now, open a cold faucet. It will sputter for a short time,
but will soon expel a steady stream� All other faucets
can now be opened until all air is expelled�
Once the system is filled with water and the faucets are
closed, the water pump will shut off. When a faucet is
opened, the pump will come back on automatically. If
the faucet is just barely open, it is normal for the pump
to cycle on and off rapidly�
9-6
It is normal for a pump to occasionally cycle when all
faucets are off to keep the water pressure at the set
point. However, if it cycles frequently (e.g. more than
a few times an hour) the plumbing system, pump, and
pump strainer should be checked to be sure it is not
losing pressure through a slow water leak or back
through the pump�
To prevent equipment damage, the water heater
should only be started after the water system is
see 12-
Turn the water pump off when the touring coach is
Water Pump and Strainer
The water pump and strainer are located under the
bathroom sink, accessed by opening the doors and
removing the back panel� The water pump is controlled
by the main Multiplex control panel or the panel located
in the galley. Once the switch is turned on, the pump
will run until the water pressure reaches approximately
55 psi. At this point, an internal pressure switch will
shut it off. When a faucet is opened, the water pressure
will drop and the pump will start to run again�
As a general rule, the water pump should be turned off
while using a city water hookup; however, the water
pressure at some campgrounds may be low� The water
pump can be turned on to assist the city water hookup
pressure� Be sure there is some water in the fresh
water tank� The pump will only use the water that is
needed out of the tank to bring the pressure up to the
usual standard of 55 psi�
NOTE
primed and ready for use.
NOTE
left unattended or in motion.
2024 Tommy Bahama Atlas
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