Airstream 2019 International, Owner'S Manual

Page: 55 / 104

Exterior
2019 International
6-7
Liquid Petroleum Gas (LPG)
Fill Valve
The LPG tanks are equipped with fill 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 flow 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 fitting; 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 fittings used for filling propane cylinders.
The mating, green swivel nut and brass nipple also
incorporate new features: the 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 flow of gas from the cylinder. Inside
the brass nipple is a flow-limiting device designed
to sense excessive gas flow. If an excessive flow is
sensed, the flow-limiting device shuts the flow down
to a maximum of 10 SCFH (Standard Cubic Feet per
Hour) or less� This is also referred to as the bypass
flow.
Bypass flow is extremely important in the proper
operation of this connection. The flow-limiting device
may activate if the cylinder valve is opened quickly�
When all appliances are off, the bypass flow allows
the pressure downstream from the flow-limiting device
to equalize. When pressure is equalized, the flow-
limiting device will supply normal flow 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 flow
in the system, the bypass pressure will not be able to
equalize and allow the flow-limiting device to re-open.
Symptoms of this condition would be appliances that
light but have lower than normal flame or starve out
from lack of gas, a substantial reduction in the flame
when another appliance is operating, or pilots that are
difficult to light. If this should happen, the following
steps should eliminate the condition:
1� Close LPG cylinder valve�*
2�
Extinguish all flames 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 difficulties continue, there may be a
leak in the system� Immediately close LPG cylinder
valve and have system inspected by qualified 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 fire or
explosion, which could result in serious bodily
injury, property damage, and/or death.
The amount of time 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�