87
Plumbing Systems
start when pressure drops. Some cycling may occur, depend-
ing on the volume of water being released. The water pump
has a built-in check valve to prevent water from back flowing.
Water pump filter (if so equipped)
The water pump incorporates a screen filter on the inlet side.
This reusable screen must be cleaned periodically.
WATER HEATER
The water heater is designed to heat water quickly and effi-
ciently. The water heater manufacturer has preset the sensing
limit to maintain the water temperature when the water heater
is activated. Read the safety and operating information provid-
ed in the manufacturer’s manual before attempting to activate
the water heater.
Operating instructions
Make sure the water heater is filled with water before use;
even momentary operation of the water heater without water
in it may result in damage to the tank and/or controls. Always
open both the hot and cold water faucets when filling the
fresh water tank to allow air pockets to be forced out of the
water heater.
Draining and winterization
If the RV is to be stored over the winter months, the water
heater must be drained to prevent damage from freezing. It
is recommended the water heater be drained and bypassed
during the winterization process particularly if introducing RV
antifreeze into the plumbing system.
Odor from the hot water system
Many water supplies contain sufficient amounts of sulfur to
produce an odor, often called “sulfur water.” Sulfur water can
be caused by a chemical action or by bacteria. Generally,
sulfur water is not harmful, only unpleasant to smell. Refer to
the water heater manufacturer owner manual for details on
eliminating the odor from sulfur water. Odor from sulfur water
is not a service problem.
High altitude deration
Operation of the water heater at high altitudes may require
de-rating. If the water heater is not properly de-rated, lack of
sufficient oxygen for combustion may produce improper burn-
er operation. Pilot outage caused by burner lift-off or sooting
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