Follow the same procedure for a gray water holdin
g
tank, although a repeat flushing may not be neces-
sary
. When the tanks are empty, push in the dum
p
valve handles until they seat
. Remove the hose
,
wash it and return it to the storage container
. Replac
e
termination outlet cap
.
LP GAS SYSTE
M
GENERA
L
The Liquefied Petroleum (LP) Gas System i
n
your unit furnishes fuel for hot water, heat, cooking
,
and refrigeration
. LP gas, a by-product of the petro-
leum refining process, provides a portable, efficien
t
and inexpensive source of energy
. It is stored in
a
tank (Figure 10) in a compartment of your unit
.
Under pressure in the tank, the LP gas turns t
o
vapor
; it is the vapor which burns
. Each tank has
a
20% liquid level gauge which allows space in th
e
bottle for vapor expansion
. The high pressure of th
e
vapor in the bottle is reduced in two stages through
a
regulator
. The tank pressure will vary with tempera-
ture and altitude, but may be 100 to 250 pound
s
per square inch or more
. It is reduced to abou
t
12 psi in the first stage, then to about 6-1/4 ounce
s
in the second stage (the 6-1/4 ounces per square inc
h
also is expressed as 11 inches of water column)
.
The LP gas is propane or a blend of propane an
d
butane, depending upon your locale
.
The LP gas system is designed and built to rigi
d
standards and tested before leaving the factory
.
Your GMC dealer also tests the system prior t
o
delivery to you
. Except for simple maintenanc
e
and occasionally tightening a connection, you shoul
d
take your unit to an authorized GMC dealer fo
r
LP gas problems
. The LP tank should always b
e
filled by an authorized LP supplier
.
NOTE
: Jimmy Motor Homes is not responsibl
e
for personal injury or property damage resultin
g
from improperly maintained LP gas appliance
s
and systems
.
LP gas burns readily and with intense heat
.
With
proper care and
maintenance,
it is safe and efficient
.
However, there are certain characteristics of L
P
gas of which you should be aware
. In its natura
l
state, LP gas is odorless, but an additive gives it
a
distinctive odor so that leaks may be readily detected
.
WARNING
: For your safety, if you smell gas
:
1.
Open all window
s
2.
DO NOT touch electrical switche
s
3.
Extinguish any open flam
e
4.
Close Service valv
e
5.
Immediately call your gas supplie
r
LP gas is heavier than air and tends to collec
t
in low pockets
. As LP gas settles into any close
d
area, it displaces air and thus could cause suffocatio
n
if not detected
. It could also create a fire or explosio
n
hazard
.
Before using any LP gas appliance, read th
e
respective manufacturer's instruction manual
.
CLIMATE DIFFERENCE
S
The appliances will not function if the LP ga
s
does not vaporize
. Butane will not vaporize belo
w
32 degrees F
.(the freezing point of water), bu
t
propane will continue to vaporize down to 44 degree
s
below zero
. Propane has become the main type o
f
LP gas used in RV's in recent years
. Your LP supplie
r
will have the correct type or blend for your locale
.
If your travels will take you into an area wher
e
climate differs, ask your LP dealer for his recom-
mendations
. The names of LP suppliers can be foun
d
in the yellow pages of your telephone directory unde
r
"Gas-Liquefied Petroleum - Bottled & Bulk"
. Man
y
campgrounds now have LP gas fill facilities, as d
o
some service stations
.
To operate any LP gas appliance, the LP ga
s
tank's Service valve (Figure 10) must be OPEN
.
When first used, or after a refill, there may be som
e
air in the gas lines which will escape when you firs
t
open a range burner or similar LP gas valve
. The ai
r
may extinguish your match or igniter the first tim
e
or two, before you get ignition
. Remember, too
,
that when you close the tank's Service valve som
e
of the gas will remain in the lines
. To completel
y
bleed the lines of gas, CLOSE the tank's Servic
e
valve and light a range burner to use up the excess
.
When the flame burns out, turn the range burner OFF
.
FILLING THE LP GAS
TANK
Before having an LP gas tank filled, be certai
n
all burners and pilot lights are off
.
Drive your motor home to an authorized L
P
supplier for filling (never remove the tank)
. He wil
l
connect the
fill
nozzle to the LP gas tank
fill
valve
.
The Service valve and the 20% liquid level gaug
e
must be open
. When liquid appears at the liqui
d
level gauge, the tank is filled to its LP capacity
.
Close the Service valve and the 20% liquid leve
l
gauge
. Do not use a wrench to tighten the Servic
e
valve or the 20% gauge
; they are designed to be close
d
15
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