Section 7 --- LP-Gas Systems
The Executive 2005
314
LP-GAS REGULATOR
LP-Gas is compressed into liquid form in
the tank. Only the vapor is used during com-
bustion 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 contin-
ue until there is no liquid remaining in the
tank.
Temperature affects action of the liquid to
vaporize. If temperature of the liquid is - 44º
F, the liquid remains stable with tank pres-
sure, 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. Vapor pressure regulation is per-
formed by the regulator.
The motorhome two-stage regulator reduces vapor pressure so that it is safe for use. The first stage
of the regulator reduces tank pressure to a range of 10 to 13 psig (pounds per square inch gauge). The
second stage further reduces pressure to a working pressure of 0.4 psig (11 Inches of Water Column or
about 6¼ ounces psi.). A vent is installed to allow the internal diaphragm to move with atmospheric
pressure change. It is important to keep the vent clean and clear of obstruction or corrosion. If the vent
becomes clogged, pressure from LP tank may cause erratic pressure regulation. If there is any corrosion,
contact a qualified LP-Gas 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 an LP-Gas regulator will not freeze, nor will the LP-Gas.
Vapor passing through the regulator will expand and cool, condensing moisture in the gas. The mois-
ture 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 LP-Gas tank is totally free of moisture prior to filling.
• Ensure the tank is not overfilled.
• Keep the valve closed when the tank is empty.
050251
Typical Two-Stage Regulator
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