Owner`s manual

8-11
SECTION 8
APPLIANCES & INTERIOR FEATURES
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.
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
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.
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.
Water Heater Exterior Service Access
Open
Lift handle straight out to open P-T valve
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.
CAUTION