Farm Fans C-2120A, Operator'S Manual, Page: 10 / 68

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Fig. 2-1 Fuel hookup
CAL POWER SUPPLY headings in this section for
important fuel and electrical requirements. Check that
all gas fuel lines are free of leaks. Also check vaporiz-
er assembly on all liquid propane models to ensure that
vaporizer coil does not contact the burner vanes; see
Section 7 - SERVICE, for vaporizer coil inspection
details.
After dryer and all systems have been completed, start
dryer and check it for proper operation as outlined in
Section 4 - TEST FIRING.
FUEL CONNECTION
LIQUID PROPANE (LP) DRYERS WITH INTERNAL
VAPORIZERS
LIQUID DRAW — The dryer is designed to operate on
liquid propane, with liquid draw from the supply tank. A
piping system is provided on the dryer, including strain-
er, pressure relief valve, and manual shut-off valve; a
pressure regulator is provided on each fan-heater unit,
between the vaporizer and burner.
AMMONIA TANKS — Do not use propane supply
tanks which have previously contained ammonia or fer-
tilizer solutions. These substances are extremely cor-
rosive and damaging to fuel supply and burner parts.
OIL OR WATER IN TANKS — With liquid draw from
the supply tank, any water present in the tank may
freeze in the piping and controls in cold weather. To
ensure that tanks are free of moisture, the usual pre-
caution is to purge with methanol. Avoid tanks which
may contain an accumulation of oil or heavy hydrocar-
bons from long use on a vapor withdrawal system.
NATURAL GAS (NG)
GAS VOLUME AND PRESSURE — The dryer is
designed to operate on natural gas having a heat
value of about 1,000 BTU per cubic foot. The dryer is
equipped with a natural gas supply pipe system con-
nected to the heater solenoid valves. A regulated pres-
sure of 8 to 10 PSI must be provided at the connection
to the dryer, with gas available in sufficient volume to
maintain operating pressure.
LP CONNECTION
NATURAL GAS CONNECTION
CONNECTION TO LIQUID
MANIFOLD ON DRYER
Use a flexible connection
hose designed for LP gas.
See Table 2-1 for recommend-
ed line size.
Fuel supply system should conform with
National Fire Protection Association stan-
dards.
Consult propane supplier for proper fittings,
connection hose, and safety controls
required to meet standards.
Do not use a pressure regulator at the sup-
ply tank.
Open LP shut-off valves slowly to prevent
accidental closing of excess flow valves.
PROPANE SUPPLY TANK
Recommended minimum of 1,000
gallons connected for liquid draw.
CONNECTION TO NATURAL
GAS MANIFOLD ON DRYER
See Table 2-1 for recommend-
ed line sizes.
NATURAL GAS METER and REGULATOR
See Table 2-1 for required pressure and typical
maximum fuel flow rates.