Propane Regulator - Monaco 2009 Knight Owner's Manual

BasiC FaCTs aBOuT PrOPane
Propane detectors are a federal requirement

on all propane equipped recreation vehicles.
Propane is a by-product produced by

refining oil.
Oil is added to 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.
Tanks or valves contain pressure relief

valves. The relief valve opens at 125%
above tank rating.
Propane stops vaporizing at -44˚ F.

standard propane operating pressure is

11" of Water Column or approximately 6 ¼
ounces 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.
PrOPane sTaTisTiCs
Pounds Per gallon
Specific Gravity of Gas
Specific Gravity of Liquid
Cubic Feet Gas Per Gallon of Liquid
Cubic Feet gas Per Pound
BTus Per gallon
BTus Per gallon
Dew Point in Degrees Fahrenheit
vapor Pressure at 0˚ F
vapor Pressure at 70˚ F
vapor Pressure at 100˚ F
vapor Pressure at 110˚ F
Flash Point
NOTE
The propane fundamentals
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.

pROpANE REgULATOR

Propane is compressed into liquid form
in the tank. Only the vapor is used during
combustion by an appliance. As vapor is
removed from the tank, the remaining liquid
will vaporize to maintain pressure that is
removed during consumption. This process
will continue until there is no liquid remaining
in the tank.
Temperature affects the vaporizing action of
the liquid. If temperature of the liquid is - 44º
F, the liquid remains stable with tank pressure,
about 0 psi. If liquid temperature is 100º F, the
liquid quickly vaporizes with tank pressure,
about 200 psi. Vapor pressure must remain
relatively consistent, regardless of temperature,
for the appliance heat output to remain stable.
4.24
Vapor pressure regulation is performed by the
1.50
regulator.
.504
The two-stage regulator reduces vapor
36.38
pressure so that it is safe for use. The first
8.66
stage of the regulator reduces tank pressure
91,502
to a range of 10 to 13 psig (pounds per square
21,548
inch gauge). The second stage further reduces
-44˚ F
pressure to a working pressure of 0.4 psig (11
31
Inches of Water Column or about 6¼ ounces
127
psi.). A vent is installed to allow the internal
196
diaphragm to move with atmospheric pressure
230
change. It is important to keep the vent
842˚ F
clean and clear of obstruction or corrosion.
If the vent becomes clogged, pressure from
the propane tank may cause erratic pressure
regulation. If there is any corrosion, contact
a qualified propane service technician. The
regulator is mounted so that the vent faces
downward. If the vent becomes clogged, clean
it with a toothbrush.
Under normal atmospheric conditions a
propane regulator will not freeze, nor will the
propane. Vapor passing through the regulator
will expand and cool, condensing moisture in
the propane. The moisture will freeze, build up
and block the vent. The possibility of freeze up
is greatly reduced with the two-stage regulator.
To Prevent Freeze Up:
Ensure the propane tank is totally free

of moisture prior to filling.
Ensure the tank is not overfilled.

Keep the valve closed when the tank is

empty.
If A Freeze Up Occurs:
Have an propane distributor purge the

tank.
Have the propane distributor inject

methyl alcohol in the tank.
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