Monaco LaPalma Owner's Manual page 281

Damage to the regulator can occur when the tank is overfilled. The
regulator is designed to work with vapor only. This is why the tank is filled
to only 80% of its liquid capacity. The other 20% allows for vaporization
of the liquid. The primary vapor valve is located in the vapor section of the
tank. In an overfilled tank, liquefied petroleum can fill the regulator. As the
liquid vaporizes, it can freeze the diaphragm. High tank pressure on a
frozen diaphragm can cause a rupture resulting in erratic pressure
regulation. This is why it is important to have the LP-Gas pressure checked
for proper pressure and accurate regulation during appliance operation.
Erratic pressure regulation dramatically effects furnace output, water heater
recovery time and refrigerator operation on LP-Gas.
Manometers:
The manometer is the best way to accurately determine LP-Gas pressure.
There are two different styles of manometers, a gauge and a U-tube. Gas
pressure is measured in Inches of Water Column. This is the amount of
pressure applied to one side of a U-shaped tube half filled with water. The
amount of pressure needed to raise the column of water 11" represents 11" of
Water Column.
WARNING: Do not attempt to adjust the regulator, it is
preset at the factory. If adjustments need to be made it
requires special equipment. Failure to follow these
instructions may result in a fire or explosion and cause
severe personal injury or death. Do not operate any LP-Gas
appliance until the LP-Gas pressure is checked and a leak
down test is performed!
2004 • LaPalma
Example of Operation
U-Tube
LP-Gas System
Manometer Gauge
050259
050260
7 • 281