SECTION 8
APPLIANCES & INTERIOR FEATURES
8-10
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. OPERATE THIS
VALVE ONLY WHEN THE WATER HEAT-
ER AND COOLING SYSTEM ARE COLD!
MOTOR AID (Optional)
The motor aid acts as a heat exchanger be-
tween the water heater and the vehicle engine.
Two hoses from the water heater connect to the
hoses which deliver hot water between the engine
and the driver’s compartment heater. A heat ex-
changer in the water heater then circulates the
water from the engine radiator around the water
heater tank. Under normal conditions, the entire
contents of the water heater tank will be heated to
approximately 140F in about two hours or 100
miles of driving.
In addition, the motor aid heat exchanger
helps the vehicle engine to operate at cooler tem-
peratures by dissipating heat from the engine.
This reduces the possibility of overheating, par-
ticularly when operating in hot climates.
Motor Aid Water Heater and Rear Auxiliary
Heater Maintenance
Have your authorized dealer check all hose
clamp connections on the rear automotive heater
and the motor aid water heater at least every six
months and tighten them if necessary.
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
pg. 7-5 for the exact location in your coach.
Line up the arrow on the handle with the ap-
propriate arrow on the valve plate to either by-
pass or flow through the water heater.
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.
Lift straight out to open P-T valve
CAUTION
Any leak in the heat exchanger or its
supply or return lines could cause loss
of coolant and subsequent engine fail-
ure. We recommend that you periodi-
cally inspect these connecting lines
and the heater to insure that no leaks
have developed.
CAUTION
Normal
Flow
By-Pass
Mode
