Tiffin Motorhomes 2017 Allegro Breeze, Owner'S Manual

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APPLIANCES & ACCESSORIES
42
WATER HEATER STORAGE
PRESSURE RELIEF VALVE
If the motorhome is to be stored during the winter months, the water heater should be drained to pre-
vent damage caused by freezing water contained in the water heater.
To drain the water heater, fi rst turn “o ff ” all electrical power, turn “o ff ” the LP gas going to the water
heater, then turn “o ff ” the water pump. Open both the hot- and the cold-water faucets to drain the
water lines and open the drain on the water heater to drain the entire system.
When re-activating the water heater a ft er the motorhome is taken out of storage, make sure that the en-
tire water system, including the water heater, has been fi lled with water and the lines have been purged
of any entrapped air before relighting the water heater. Failure to do so may allow the water-heating
element to be turned “on” before it is immersed in water; thereby, causing the premature failure of the
heating element and voiding the warranty.
Th e relief valve for over-pressure and over-temperature conditions is located on the exterior of the
water heater. Th is valve will operate if the water temperature reaches or exceeds 210°F or if the water
pressure reaches or exceeds 150 psig.
Since the water system in the motorhome is a closed system when all water valves are shut, the wa-
ter-heating cycle can raise the temperature and, consequently, the pressure, of the water in the water
heater; thereby realizing pressure increases approaching 150 psig.
Should this pressure (i.e., 150 psig) be reached, the pressure-relief valve will begin “weeping,” that is,
minor dripping or leakage from that valve until the pressure drops below 150 psig, at which time the
pressure-relief valve will re-seat itself and restrict the water fl ow. Th is is normal operation and should
not be a cause for alarm. Do not obstruct or block the pressure-relief valve in any way, as this would
keep the valve from functioning normally and protecting the hot water system.
Figure 5-9: Water heater Figure 5-10: Water heater relief valve