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Section 8: Plumbing System
Make sure the water heater is filled with water before use as even momentary operation of
the water heater without water in it may result in damage to the tank heating element and/or
controls.
Double check the bypass valves
, make sure they are set properly.
Always open both the hot and cold water faucets when filling the fresh water tank to allow
air pockets to be forced out of the water heater.
Water heater switch (if so equipped)
The “propane GAS” switch enables propane operation of the water heater, and the “ELEC-
TRIC” switch enables electric operation.
Water heater bypass
Use the factory installed water heater bypass, available in most floor plans, to avoid filling
the entire water heater with RV antifreeze. See the
Utility Center
section for details on using
the bypass system.
High altitude deration
Operation of the water heater at high altitudes may require derating. If the water heater is not
properly derated, lack of sufficient oxygen for combustion may produce improper burner
operation. Pilot outage caused by burner lift-off or sooting from a yellow burner may occur,
indicating the possibility of carbon monoxide. You may also notice a lack of efficiency 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 orifice (derating) should be done by
the dealer or a qualified service agency.
Pressure and 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
NOTE:
Water heaters in certain models will ONLY have a single LP
Gas water heater switch. These units will not heat water electrically
NOTE:
It is important that once the RV has returned to lower
elevation (below 4500 feet) any high altitude deration or other adjust
-
ments 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.
Table of Contents
Maintenance Record
Summary of Contents for Precept
Page 1: ...2021 Owner s Manual 0230295 2021 A subsidiary of Thor Industries Inc...
Page 2: ......
Page 8: ...Table of Contents...
Page 23: ...21 Section 1 Warranty Service Table of Contents Maintenance Record...
Page 24: ...22 Section 1 Warranty Service Notes Table of Contents Maintenance Record...
Page 34: ...32 Section 2 Occupant Safety Notes Table of Contents Maintenance Record...
Page 40: ...38 Section 3 Pre Travel Information Notes Table of Contents Maintenance Record...
Page 156: ...154 Section 13 Exterior Notes Table of Contents Maintenance Record...
Page 160: ...158 Section 14 Travel Camping Storage Checklists Notes Table of Contents Maintenance Record...
Page 164: ...162 Section 15 Additional Information Notes Table of Contents Maintenance Record...