Jayco Seismic 2021 - Pressure and Temperature Relief Valve; Draining and Winterization

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indicating the possibility of carbon monoxide. You may also notice a lack of eciency 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 orice (derating) should be done by
the dealer or a qualied service agency.

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 o the water heater.
2. Turn o 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.
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If the recreation vehicle is to be stored over the winter months, the water heater must be
drained to prevent damage from freezing. Damage to the water heater caused by freezing
is not warrantable. It is recommended the water heater be drained and bypassed during the
winterization process, 
. 
 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.
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.
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