SECTION 7
PLUMBING SYSTEMS
7-2
WATER PUMP
Pressure for the water system is supplied by a
water system demand pump which is fully auto-
matic after initial priming. When a faucet is
opened, the pump begins operation to provide a
constant flow from the tank. When the faucet is
closed, the pump automatically shuts off.
Water Pump Switch
Your coach is equipped with water pump
switches in three convenient locations:
•
on the monitor panel (see section 8)
•
in the bathroom
•
in the utility service compartment on the out-
side of the coach
While any pump switch is in the “ON” posi-
tion, the pump will automatically supply water
pressure as it is needed. It is recommended that
the pump switch be turned off whenever you are
away from the vehicle or not using the water sys-
tem. A slow leak in a faucet could drain the water
system and discharge the coach battery.
Initial Start-Up
1. Make sure that all water drain valves are
closed, including water heater valve. (Refer
to Section 10.)
2. Turn water pump switch to “OFF” position.
3. Fill water tank.
4. Open all faucets, hot and cold.
5. Turn on pump switch.
6. Close each faucet as it begins to deliver a
steady stream of water (close cold water
first). Leave hot water faucets on until they
also deliver a steady stream of water. This
will ensure that the water heater is filled with
water.
7. Check to be sure pump stops soon after all
faucets have been closed.
8. Pump is now ready for automatic operation.
Pump will start when a faucet is opened and
stop when the faucet is closed.
ACCUMULATOR TANK
A pressurized accumulator tank is installed in
the water line directly upstream from the water
pump located in the water pump compartment
on the right side of the coach.
The accumulator tank holds a small amount
of water under pressure of 20 psi to reduce water
line pulsation noise and pressure variations
when using the water pump system. This also
contributes to longer pump life, less pump
cycling, and less amperage draw by the water
pump from the coach batteries.
NOTE: The accumulator tank has a precharge
pressure which must be
checked month-
ly
and maintained at
20 psi
for the sys-
tem to work properly.
Water Pump
Accumulator Tank