Tiffin Motorhomes 2014 Phaeton, Owner'S Manual

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Caution
Yearly maintenance is required on the burner portion
of the Hydro-Hot heating system
4-19
TIFFIN MOTORHOMES –PHAETON® Chapter 4 MAJOR APPLIANCES & ACCESSORIES
Pressure-Relief Valve
The relief valve for over-pressure and over-temperature conditions is located on the exterior of the water heater. This
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 motor home is a closed system when all water valves are shut, the water-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 flow. This 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.
Caution
Your Hydro-Hot heating system operates off the coach’s sole diesel tank! Keep in
mind that the Hydro-Hot fuel tube is located higher up in the diesel tank than the
coach’s engine fuel in order to prevent complete depletion of the diesel fuel tank.
Be sure an adequate amount of fuel is in the fuel tank before dry camping.
Caution
DO NOT operate the Diesel-Burner and/or the Electric Heating Element without the
water and antifreeze solution in the Hydro-Hot’s Boiler Tank. Failure to do so will
cause serious damage to the Heater.