Monarch SE 2004------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Section 7 LP-Gas System | 271
The regulator is the heart of the LP-Gas system. The regulator reduces vapor
pressure so that it is safe to use. The regulator on the motorhome is a two-stage
regulator. 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.). The regulator has a vent that allows 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 could
cause erratic pressure regulation. If there is 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 regulator will not freeze, nor will
the LP-Gas. Vapor passing through the regulator will expand and cool condensing
moisture in the gas. The moisture will freeze which can build up and partially or
totally block the vent. The possibilities of freeze up are greatly reduced with the
two stage regulator.
To Prevent Freeze Up:
1. Ensure the LP tank is totally free of moisture prior to filling.
2. Ensure the tank is not overfilled.
3. Keep the valve closed when the tank is empty.
If a Freeze Up occurs:
1. Have an LP-Gas distributor purge the tank.
2. Have the LP-Gas distributor inject methyl alcohol in the tank.
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 refrigerator
operation on LP-Gas.
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