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SECTION 6
APPLIANCES & EQUIPMENT
The water heater tank is designed so that there
is normally an air pocket at the top of the tank that
acts as a pressure buffer. In time, however, heat-
ed water may expand and fill this air pocket,
causing a slight increase in water pressure. This
may cause the P-T valve to "weep" until the air
pocket is manually replaced.
CAUTION
OPERATE THIS VALVE ONLY
WHEN THE WATER HEATER
AND COOLING SYSTEM* ARE
COLD!
To Replace the Air Pocket:
1. Turn off the water heater switch and incom-
ing water supply (city water and/or demand
pump).
2. Open a faucet in the motor home to relieve
water pressure.
3. Pull the handle of the P-T valve straight out
and allow water to flow until it stops.
Lift handle straight out to open P-T valve.
4. Let the handle of the P-T valve snap shut.
5. Close the faucet and turn on the water supply
before switching the water heater on.
Manually operate the pressure temperature re-
lief valve at least once a year.
*If your water heater is equipped with the op-
tional Motor Aid system, it uses an extension
from the engine cooling system to heat water in
6-12
Open
the water heater while driving. The engine cool-
ing system must also be cold before opening the
pressure-temperature relief valve. See "Motor
Aid" for more information.
Water Heater By-Pass Valve
Your coach is equipped with a water heater
by-pass valve for easier winterization of water
lines using RV antifreeze. The valve is located in
the water pump compartment.
Water Heater By-Pass Valve
(Typical)
CAUTION
Leave by-pass valve handle in NOR-
MAL FLOW position if draining
water and blowing out water lines.
Place in BYPASS position ONLY
when using antifreeze solution in
water lines.
MOTOR AID WATER HEATER
The motor aid uses heat from the chassis en-
gine cooling system to heat water in the water
heater while driving. Hoses are routed from the
engine to a heat exchanger surrounding the water
heater tank.
Under normal conditions, the entire contents
of the water heater can be heated to about 120°F
in about two hours or 100 miles of driving. This
means you can have hot water at the faucets im-
mediately upon arriving at a site, or even while
driving if needed.
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