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Water Heater Exterior Service Access
Normally there is an air gap at the top of the
water heater tank which acts as a pressure buffer.
In time, however, heated water may expand and
fill this air gap, causing a slight increase in water
pressure. This may cause the P-T valve to "weep"
until the air gap is manually replaced.
OPERATE THIS VALVE ONLY WHEN
THE WATER HEATER AND ENGINE COOL-
ING* SYSTEM ARE COLD!
To Replace the Air Gap:
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.
APPLIANCES & INTERIOR FEATURES
Open
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
the water heater while driving. The engine cool-
ing system must also be cold before opening the
pressure-temperature relief valve. See "Motor
Aid" on following page for more information.
Water Heater By-Pass Valve
Your coach may be equipped with a water
heater by-pass valve for easier winterization of
water lines using RV antifreeze. The valve is lo-
cated inside the coach near the water heater. See
Section 7 for the exact location in your coach.
Turn the handle as shown to either by-pass or
flow through the water heater.
CAUTION
Leave by-pass valve handle in NOR-
MAL position if draining water and
blowing out water lines. Place in
BYPASS position ONLY when using
antifreeze solution in water lines.
MOTOR AID
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.
SECTION 8
8-11
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