Grand Design Momentum, Owner'S Manual

Page: 110 / 220

108
Plumbing Systems
Water Heater
The water heater is turned ON & OFF on the
Monitor Panel
of the
ONEControl ® System . ( See pages 86, & 106. )
The water heater is designed to heat water quickly and efficiently.
It's temperature is preset by the manufacturer. Read all safety
and operating information provided here and in the manufactur-
er’s manual before attempting to activate the water heater.
• Even momentary operation of the water heater
while
empty
may result in non-warrantable damage
to the tank and/or controls
• CHECK that the Water Heater is filled with water before use;
• 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 recom-
mended 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 sources provide running water with a rotten egg
smell. Often called sulfur water, it contains hydrogen sulfide gas
caused by bacteria or chemical action. Generally, sulfur water is
not harmful, only unpleasant to smell. Sulfur water odor is not a
service problem.
See Page 197 , Basic Troubleshooting, Water Heater.
Also refer to the water heater manufacturer's owner manual
for details on eliminating the odor from sulfur water.
High Altitude Deration
Operation of the water heater at high altitudes may require der-
ating. If the water heater is not properly derated, lack of sufficient
oxygen for combustion may produce improper burner operation.
Pilot outage caused by burner lift-off or sooting from a yellow
burner may occur, indicating the possibility of carbon monox-
ide. You may also notice a lack of efficiency in heating the water
because of incomplete combustion of the burner at these higher
altitudes. Consult with a local propane company, your dealer or
the water heater manufacturer for proper derating of the water
heater. Change out of the orifice (derating) should be done by
the dealer or a qualified service agency.
If you smell propane gas
then STOP ! Follow the
procedures listed in the
Propane System section
of this manual before
attempting to operate the
water heater.
WARNING
Hydrogen gas may result if
you have not used the water
heater for two weeks or
more. HYDROGEN GAS IS
EXTREMELY FLAMMABLE.
To reduce the risk of injury
under these conditions,
open the hot water faucet
for several minutes at
the kitchen sink before
you use any electrical
appliance connected to
the hot water system. If
hydrogen is present, you
may hear what sounds like
air escaping through the
pipe as the water begins to
flow. Hydrogen gas may be
present even after water
has been drained from the
water heater tank. Open
the faucet at the sink and
allow the system to vent for
five to ten minutes. Do not
smoke or have any open
flame near the open faucet
while venting. On DSI water
heater models, make sure
the switch is OFF.
WARNING
It is important
that once the RV
has returned to
lower elevation
(below 4500 feet) any high
altitude deration or other
adjustments be reversed
for proper operation of the
water heater.