HOWTO: Propane System
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© 2016 by Erwin Hymer Group North America, Inc.
Propane relief valve
Propane relief valve
There is a pressure relief valve on the tank. It is not easily visible
on the Zion.
Under no circumstances should anyone fill the tank to more than
80% capacity; doing so can cause liquid propane to flow into the
regulators. If this happens the regulators will have to be
replaced. The relief valve with the blue plastic cover will
automatically vent propane if the tank is overfilled or overheats.
This is not a user-serviceable item; never attempt to remove the
cover, test, or otherwise interfere with the operation of this
valve. Sometimes an overfilled tank will not start venting until
the temperature rises. If this valve should open, it is best to
remove all sources of ignition and expeditiously leave the area
until propane odor is no longer detectable. Venting unburned
propane is a slightly more advantageous situation than a tank
explosion, which is what this valve is designed to prevent.
Propane Sender
The propane tank has a level indicator with a remote sender to the Monitor Panel. Both the three-light system on the monitor
panel and the gauge on the tank will give you a rough idea of your propane level; you will get a more accurate indication
when you fill up. Note the amount it takes to fill your tank. The seven gallon tank in your Roadtrek will hold 5.6 gallons / 20
liters when completely empty and filled to the correct 80% full level. Subtract the amount you buy from this number, and
you'll know how much was in the tank when you filled it. You may find that the gauge will read one light when you still have a
considerable reserve, or you may find that empty means empty, and you'd be wise to refill as soon as it goes down to one
light. It depends on the characteristics of your individual propane system.
