101
plumbing SyStem
You may also notice a lack of efciency in heating the water because of incomplete
combustion of the burner at these higher altitudes.
Consult with the local propane company, your dealer or the water heater manufacturer for
proper derating of the water heater. Change out of the orice (derating) should be done by
the dealer or a qualied service agency.
Pressure & temperature relief valve
The temperature and pressure relief valve is designed to open if the temperature of the water
within the heater reaches 120° F, or if the water pressure in the heater reaches 150 pounds.
When this pressure is reached, the pressure relief valve will open and water will drip from
the valve.
This “weeping” or dripping will continue until the pressure is reduced to below 150 pounds,
and the valve closes. This condition is normal and does not indicate a defective relief valve.
One way to reduce the frequency of this occurrence is to maintain an air pocket at the top
of the water heater tank. This air pocket will form in the tank by design; however, it will be
reduced over time by the everyday use of your water heater. To replenish this air pocket:
1. Turn off the water heater.
2. Turn off the cold water supply line.
3. Open a faucet in the recreation vehicle.
4. Pull out the handle of the pressure relief (P&T) valve and allow water to ow from the
valve until it stops.
5. Release the handle on the P&T valve - it should snap closed.
Close the faucet and turn on the cold water supply. As the tank lls, the air pocket will
develop. Repeat this procedure as often as needed to reduce the frequency of the weeping
P&T valve.
Maintenance
Do not allow the burner to burn with a yellow ame, or continue to operate the water heater
with an improper burner ame.
Periodically, inspect the water heater vent for soot. Soot is a sign of incomplete combustion
and must be corrected before operating the water heater. This is your visual warning that the
Do not place a valve between the pressure and temperature (P&T) valve and
the tank. Do not remove or plug the relief valve under any circumstances.
NOTE:It is important that once the RV has returned to lower eleva-
tion (below 4500 feet) any high altitude deration or other adjustments
be reversed for proper operation of the water heater.
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