116
2014 Holiday Rambler Travel Trailer
Propane Systems - 7
chanGeover valve
Open both primary shut-off valves. The
“lever” on the changeover valve will point
to the tank in service. As long as pressure in
the service tank is above 10 psig, the empty
indicator will show clear. The changeover
valve will automatically switch to the other
tank when pressure in the service tank drops
below 10 psig and the empty indicator
will change from clear to red. Shut off the
primary valve on the empty tank. The other
tank becomes the service tank and the empty
indicator will show clear. The empty tank may
now be disconnected for refilling. After the
tank has been refilled and installed, it becomes
the second tank.
NOTE:
Hand tighten the primary shut-off
valve. Do not use a wrench or pliers to
close the primary valve. Over-
tightening may permanently damage
the valve seat.
propane funDamentalS
NOTE
Propane fundamental information
is not a complete guide for the use of
propane tanks or appliances. In cold
climates, keep propane level above
50% to keep vaporization of propane
at the highest level.
Basic Facts About Propane
Propane detectors are a federal requirement on
all propane equipped recreational vehicles.
Propane is a by-product produced by refining
oil.
Odor is added to the propane after the refining
process.
Each liquid gallon of propane produces 91,502
BTUs (British Thermal Units).
Temperature affects pressure of propane.
Internal tank pressure can exceed 200 psi.
Tank or valves contain pressure relief valves.
The relief valve opens at 125% above tank
rating.
Propane stops vaporizing at -44º F.
Standard propane operating pressure is 11” of
water column or approximately 6 ¼ ounce per
square inch.
An inch of water column is a measurement of
applied pressure to one side of a U-Tube ½
filled with water at sea level. The amount of
pressure required to raise the water level 11:,
represents 11” of water column.
CONVERSIONS
Gallons to Liters
(1 Gallon = 3.785 Liters)
Fahrenheit to Celsius
(Fº - 32 ÷ 1.8 = Cº)
11 in Water Column = 6 1/4 ozs. per sq. in. pressure.
27.7 in. Water Column = 1 lb. per sq. in. pressure.
Propane Statstcs
Pounds Per Gallon
4.24
Specific Gravity of Gas
1.50
Specific Gravity of Liquid
.504
Cubic Feet Gas Per
Gallon of Liquid
36.38
Cubic Feet Gas Per
Pound
8.66
BTUs Per Gallon
91,502
BTUs Per Pound
21,548
Dew Point in Degrees
Fahrenheit
- 44º F
Vapor Pressure at 0º F
31 psi
Vapor Pressure at 70º F
127 psi
Vapor Pressure at 100º F
196 psi
Vapor Pressure at 110º F
230 psi
Flash Point
842º F
The above capacities allow for 20% vapor space
on each cylinder. Data taken from the National Fire
Prevention Association (NFPA) Pamphlet #58-1998.
#Capacity
Gallon Capacity
BTU Capacity
5
1.18
107,909
10
2.36
215,807
11
2.59
237,387
20
4.72
431,613
30
7.08
647,420
40
9.43
863,226
050253c
Typical regulator with changeover valve
Vent
Regulator
Changeover
Valve
Empty
Indicator
