SECTION 4
APPLIANCES & SYSTEMS
4-12
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.
To Replace the Air Gap:
1. Turn off the water heater switch and incoming
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
relief valve at least once a year.
*If your water heater is equipped with the
optional Motor Aid system, it uses an extension
from the engine cooling system to heat water in
the water heater while driving. The engine
cooling system must also be cold before opening
the pressure-temperature relief valve. See
“Motor Aid” for more information.
WATER HEATER BYPASS
VALVE
Your coach is equipped with a water heater
bypass valve for easier winterization of water
lines using RV antifreeze.
Turn the handle as shown to either bypass or
flow through the water heater.
CAUTION
Operate this valve only when the Water
Heater and Engine Cooling System are
cold!
Lift handle straight out to open P-T valve
CAUTION
Leave bypass valve handle in NORMAL
FLOW position if draining water and
blowing out water lines. Place in BYPASS
position ONLY when using antifreeze
solution in water lines.
Water Heater Bypass Valve
(Typical)
