Airstream Nest 2020, Owner'S Manual

Page: 48 / 82

Exterior
6-6
2020 Nest
Liquid Petroleum Gas (LPG)
Fill Valve
The LPG tank is equipped with an 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.
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 reopen. 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 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 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 gas 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.
WARNING
LPG regulators must always be installed with the
diaphragm vent facing downward. Regulators
that are not located in compartments have been
equipped with a protective cover. Make sure the
regulator vent faces downward and the cover is
kept in place to minimize vent blockage, which
could result in excessive gas pressure, causing fire
or explosion.