Valterra Products, LLC Mission Hills, CA 91346 1-800-806-6159 www.valterra.com
leaving the RV unattended
About The By-Pass NOTE: By-pass adjustment should be performed by professional technicians
with proper gauge and equipment.
The by-pass is a spring loaded diaphragm that opens up allowing water from the discharge side
back to the inlet side. The by-pass is set to begin opening at about 40psi and increasing full
by-pass at about 62 psi. The pressure switch on the pump is set to shut off at 55psi. If the switch or
by-pass is adjusted too much, the by-pass and switch shut-off can overlap and THE PUMP WILL
NOT SHUT OFF. Screwing the switch screw in clockwise will raise the shut-off pressure.
Unscrewing the switch screw counterclockwise will lower the pump shut-off pressure. Screwing
the by-pass screw in will raise the pressure at which the by-pass starts and raise the full by-pass
pressure. Unscrewing the by-pass screw counterclockwise will lower the pressure at which
by-pass starts and lower the full by-pass pressure. WARNING: If full by-pass is reached before the
shut-off setting, the pump will not shut off. Full by-pass pressure setting should be at least 5psi
higher than pump shut off pressure.
SANITIZING:
Potable water systems require periodic maintenance to deliver a consistent flow of fresh water.
Depending on use and the environment the system is subject to, sanitizing is recommended prior
to storing and before using the water system after a period of storage. Systems with new
components, or ones that have been subjected to contamination, should also be disinfected as
follows:
1. Use one of the following methods to determine the amount of common household bleach
needed to sanitize the tank.
A) Multiply "gallons" of tank capacity by 0.13; the result is the ounces (oz.)of bleach needed to
sanitize the tank.
B) Multiply "Liters" of tank capacity by 1.0; the result is the milliliters of bleach needed to
sanitize the tank.
2. Mix into solution the proper amount of bleach within a container of water.
3. Pour the solution (water/bleach) into the tank and fill the tank with potable water.
4. Open all faucets (HOT & Cold) allowing the water to run until the distinct odor of chlorine is
detected.
WINTERIZING
If water is allowed to freeze in the system, serious damage to the plumbing and the pump may
occur. Failures of this type will void the warranty. The best guarantee against damage is to
completely drain the water system.
NOTE:
When used per the manufacturer's recommendations non-toxic antifreeze for potable water is safe
for use with HYDROMAX pumps. Refer to the manufacturer for their specific winterizing &
drainage instructions.
CAUTION: Do not use Automotive Antifreeze to winterize potable water systems. Such solutions
