GAS HOSE
ADJUSTING
SCREW
%•• GAS
SUPPLY LINE
'/„
•
• PIPE PLUG©
FIGURE 13. GAS REGULATOR
GAS
REGULATOR
The regulator was factory adjusted to lock-off at a
pressure of four ounces (7-inch-.water;C.olumn). Itwill
operate satisfactory at incoming pressures between 2
and 4 ounces. If your gas supply pressure is within
these limits, no regulator adjustment is required. If
your gas supply pressure is under.2 ounces,,.the
regulator will not operate. If yourgas supply pressure
is between 4 and 8 ounces, install an appliance
regulator set for 2 ounces ahead of the regulator or
adjust the regulator as follows:
CAUTION )
A soap bubble
placed over the regulator
outlet will not accurately test the regulator
lock-off. The soap bubbles resistance when
multiplied by the greater area of the diaphragm, is enough to shut
off this very sensitive demand type regulator. A manometer must be
used to show complete regulator shut-off.
Gas Regulator Adjustment (Figure 13):
1.
Use a manometer which reads up to 14-inch water
column.
One ounce per square inch equals
1.73-inch
water column.
Likewise 1 inch water column equals 0.58 ounces per square
inch.
2.
Remove T/8 inch pipe plug (C) and connect
manometer.
3. With gas supply on and outlet hose removed,
alternately cover and uncoverthe regulatoroutlet
with your hand. If the regulator shuts off
completely, as desired, the manometer will hold a
steady reading. If the manometer reading drops
slightly each time you remove your hand, the
regulator is leaking.
4.
When necessary, adjust as follows: Turn the>.
adjusting screw (G) inward just farenough so that;
manometer reading remains constant when you
;
repeatedly cover and uncoverthe regulatoroutlet.
with your hand.
5. Operate the engine to ensure quick starting
results.
CARBURETOR,
GASEOUS
FUELS
Adjust much the same as gasoline carburetors, using
the gas fuel adjustment located in the fuel inlet
(Figure 10) to adjust when running on gas. Gas only
carburetors have no idle adjustment beginning Spec
E.
The weighted carburetor choke (Spec A through D)
should just close, but must befreetoopen with theair
stream during operation. Some chokes are fitted with
an adjusting screw — turn in for less choking action,
turn out for more choking action.
16
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