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Chapter 10: Plumbing System
Your RV plumbing consists of two primary systems: The fresh (potable) water system and the waste water system.
Fresh (Potable) Water System
Potable fresh water is supplied to the unit in two ways: 1)By filling the fresh water tank and pumping the water
through the system with the water pump. 2)Connecting a potable water hose to the “City Water Fill” which
automatically pressurizes the system.
USE POTABLE WATER ONLY IN THE FRESH WATER SYSTEM. SANITIZE, FLUSH AND DRAIN
BEFORE USING. SEE INSTRUCTIONS UNDER HEADING “SANITIZING THE FRESH WATER
SYSTEM. FAILURE TO COMPLY COULD RESULT IN DEATH OR SERIOUS INJURY.
Water Pump
The 12 V water pump installed is self-priming and operates upon demand. In simpler terms, when you open a
faucet, the pump will turn on and pump the water from the tank to that faucet. For the pump to operate, please
note the following:
1. The fresh water tank must have sufficient water in it.
2. The pump on/off switch must be in the on position. Typically located on the monitor panel.
3. There must be sufficient 12V power (battery or converter) to operate the pump.
4. The water heater has a by-pass valve that can prevent water from entering the water heater.
5. The water pump should prime itself and stop running after the open faucet(s) is closed.
6. Pump should now run on demand when a faucet is opened, and stop when the faucet is closed.
Note
Never let the water pump run while the fresh water tank is empty.
Damage to the pump and/or a blown circuit may occur.
Please refer to the manufacturer instructions supplied with the unit for care and operation and/or www.shurflo.com.
Fresh Water Tank
All Keystone units are equipped with a fresh water tank. Tanks vary significantly in size by unit brand & model.
Keystone RV units use 2 different methods to fill the fresh water tank depending on the brand & model.
Gravity Water Fill - Remove the cap, on the exterior connection labeled ”Fresh Water Connection”, and insert the
hose from your water source and turn on the water. While filling the tank, periodically check the monitor panel to
determine the level of water in the tank. When full turn the water source off. If overfilled, water will “spit” back out
of the gravity fill as there is no automatic shutoff. DO NOT leave the unit unattended while filling the fresh water
tank. Overfilling the tank can cause damage to the system components which may not be considered warrantable.
Pressure Water Fill - Hook a potable water supply to the city water fill valve, turn the valves to the tank fill position
and turn on the water supply. While filling the tank, periodically check the monitor panel to determine the level
of water in the tank. When full turn the water source off immediately. DO NOT overfill and DO NOT leave the
unit unattended while filling the fresh water tank. Overfilling the tank can cause damage to the system components
which may not be considered warrantable.
All units are equipped with “Low-Point” drains that are designed to drain water from the water tank and all lines.
These are located underneath the unit, typically near the water tank. These drains must be closed or the water
system will drain itself of any water entering.
Water should be drained from the fresh water system when not in use. Over time, water quality can degrade which
can contaminate the plastic used in the water system and/or cause ill health affects.
Keystone RV Company Owner’s Manual 4/1/2013
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