Airstream Flying Cloud 2020 - LPG System and Safety Precautions

Exterior
2020 Flying Cloud 6-7
Liquid Petroleum Gas (LPG)
Fill Valve
The LPG tanks are equipped with ll valve connections
RV Type I Acme� The large, green, nylon swivel nut is
a right-hand thread and is designed for hand operation
only�
The valve features an internal spring-loaded module
that will not allow gas to ow from the cylinder until a
positive seal has been made at the connection� The
valve outlet has 1-5/16 in� Acme threads on the outlet
exterior, and female POL, left-handed threads on its
interior� This feature allows for connection of the new
wrenchless, right-handed, Acme RV connection while
still accommodating the standard left-handed POL
ttings used for lling propane cylinders.
The mating, green nylon nut swivels on a black
bushing that is heat-sensitive� Between 240 and
300°F, the bushing will yield (melt) allowing the spring-
loaded module in the valve to push the brass nipple
back (approximately 1/4 in�), closing the module and
stopping the ow of gas from the cylinder. Inside the
brass nipple is a ow-limiting device designed to sense
excessive gas ow. If an excessive ow is sensed, the
ow-limiting device shuts the ow down to a maximum
of 10 SCFH (Standard Cubic Feet per Hour) or less�
This is also referred to as the bypass ow.
Bypass ow is extremely important in the proper
operation of this connection. The ow-limiting device
may activate if the cylinder valve is opened quickly�
When all appliances are off, the bypass ow allows
the pressure downstream from the ow-limiting device
to equalize. When pressure is equalized, the ow-
limiting device will supply normal ow to the system.
Equalization occurs in approximately 5 seconds and,
in most cases, goes completely unnoticed� If, however,
an appliance is left on or there is a leak or open ow
in the system, the bypass pressure will not be able to
equalize and allow the ow-limiting device to re-open.
Symptoms of this condition would be appliances that
light but have lower than normal ame or starve out
from lack of gas, a substantial reduction in the ame
when another appliance is operating, or pilots that are
difcult to light. If this should happen, the following
steps should eliminate the condition:
1� Close LPG cylinder valve�
2� Extinguish all ames and smoking materials.
3� Be sure all gas appliances, including their pilot
lights, are off�
4� Open LPG cylinder valve slowly� Do not snap open�
5� Wait at least 15 seconds before lighting appliances�
6� If operational difculties continue, there may be
a leak in the system� Immediately close the LPG
cylinder valve and have the system inspected by a
qualied RV service technician.
When reconnecting a full cylinder to an auto
changeover regulator, it is not necessary to shut off the
appliances or close the valve of the cylinder already in
service�
WARNING
Leaking LPG may ignite, causing a re or
explosion, which could result in serious bodily
injury, property damage, and/or death.
How long a full tank of gas will last is dependent
on usage� In cold weather, when you are using the
furnace, large amounts of hot water, and are doing
extensive cooking, you will naturally use more than you
will in warm weather when you may do limited cooking�
On the average, with normal cooking and other
appliance use, you can probably count on two to three
weeks of service from each tank�
Automatic Gas Regulator
All models are equipped with a two stage automatic
change-over gas regulator that offers the convenience
of automatic changeover from empty to full gas
cylinders� Both tanks are connected to this regulator�