Liquid Petroleum Gas (Lpg); Fill Valve; Lpg Tanks - Remove/Refill/Replace - Airstream (nest) 2019 Owner's Manual

Liquid Petroleum Gas (LPG/Propane)

Fill Valve

The LPG tanks are equipped with RV Type I Acme fill valve
connections. The large, green, nylon swivel connection nut is
right-hand thread — 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. The valve outlet has 1-5/16 in. Acme right-handed
threads on the outlet exterior and female POL, left-handed
threads on its interior. This feature allows for connection of the
wrenchless Acme RV connection while still accommodating
the standard left-handed POL fittings used for filling propane
cylinders.
GREEN, NYLON SWIVEL
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 five seconds and usually goes completely
unnoticed.
However, if 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 reopen. Symptoms of this
condition would be when appliances light but have lower than
normal flame or die from lack of gas, or when a substantial
reduction in the flame when another appliance is on or pilots are
difficult to light.
CONNECTION NUT
Should this happen, the following should resolve the situation:
1. Extinguish all flames and smoking materials.
2. Close LPG cylinder valve.
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 the LPG cylinder
valve and have the system inspected by a Qualified RV
service technician.
WARNING
Leaking LPG may ignite, causing a fire or
explosion, which could result in 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 gas than you
will in warm weather when you may
do limited cooking. On average, with
normal cooking and other appliance
use, you can prob- ably count on
two to three weeks of service per
tank.
LPG Tanks — Remove / Refill / Replace
The following procedure outlines the proper method of removing
and installing LPG bottles:
1. Disconnect the rubber gas line at the tank to be
removed. (The green nylon nut is a right-hand thread
and no tools should be used.)
2. Turn the wing nut on the ring screw counterclockwise
until the hold-down ring is loosened enough to be able
to remove the tank.
3. After re-filling or changing bottles, tighten the wing nut
until the tank is held firmly in place.
4. Re-connect the rubber gas line by hand-tightening
green nylon nut to the tank. (Again, right-hand thread.)
5. Test fittings with ammonia-free and chlorine-free
liquid soap or products designed for testing, such as
Snoop® liquid leak detector.
6-5