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13. Inspect entire dryer for loose, worn, or damaged parts.

Include check of auger flighting, meter rolls, and other
internal parts. Check that temperature sensors within
air plenum chamber are secured within the insulated
clamps and do not chafe on other metal parts.

14. Inspect that all dryer guards and warning decals are in

place and securely installed. Make certain guards do
not interfere with moving parts.

15. Test fire the dryer several weeks ahead of the drying

season. Include a check for possible gas leaks. See
Section 4 - TEST FIRING for suggested procedure.

PROPANE VAPORIZER SEASONAL
INSPECTION

LIQUID PROPANE MODELS ONLY — Liquid propane
fueled dryers are equipped with a vaporizer that oper-
ates at relatively high pressure. Since leakage can
result in release of liquid propane, it is extremely impor-
tant to maintain the condition of all components to pro-
vide safe operation. Vaporizers should be inspected
and serviced prior to each season of operation, includ-
ing the following:

1. Carefully inspect the surfaces and welds of the vapor-

izer coil and the liquid inlet and vapor outlet pipes for
evidence of severe corrosion or abrasion of metal
which could cause subsequent leakage of liquid
propane, gross overheating, and fire hazard. Such
inspection may be through the inspection port, and by
removing the vaporizer mounting plate and partially
withdrawing the vaporizer, and by inspection from the
exhaust end of the fan-heater unit.

Insecure mounting of either the vaporizer or the burn-
er, due to loosened bolts, can cause interference
between burner vanes and vaporizer pipes, with the
natural vibration of the unit causing erosion of the pipe
metal at the point of maintained contact. Such contact
also depends on adjustment of the vaporizer toward or
away from the burner.

If there is contact between the vaporizer pipe and
burner or fan housing, adjust the position of the
vaporizer to provide clearance.

For Starfire burner

models, bend the edge of the burner vane if necessary
to provide clearance. If there has been significant
abrasion of the steel vaporizer pipe, it must be
replaced.

2. Inspect the fuel train components: Liquid solenoid

valve, pressure relief valve, pressure regulator, vapor
hi-limit thermostat, and the fuel lines and fittings. The
burner hi-limit thermostat should also be checked,
since it is an automatic reset safety device that stops
burner operation by closing the liquid solenoid valve in
the event of excessive heat from liquid propane
release, possibly due to a vaporizer leak.

VAPORIZER ADJUSTMENT

LIQUID PROPANE MODELS ONLY — After initial
installation and occasionally during the drying opera
tion, check the temperature of the gas line between the
pressure regulator and the fan-heater control box.
Allow heater to operate and temperature to stabilize
before making this check. See Fig. 6-3.

NOTE:

If the gas temperature exceeds 220°F, the

Vapor Hi-limit thermostat will open the electrical circuit
to the liquid solenoid valve and shut off fuel flow to
heater, thereby causing automatic shutdown of the
dryer.

• Stainless steel octagonal burners (upper burners of
C-2130A and C-2140A): If the gas line is very cold or
"frosted," ensure that vaporizer coil is centered with the
burner. If gas line is too hot to touch, locate vaporizer
slightly off center to cool it, by manually forcing the coil
up or down. Recheck fuel line for leaks following
adjustment.

• All other (Starfire) burners: If the gas line is very cold
or "frosted," move the vaporizer slightly closer to the
flame. If gas line is too hot to touch, move vaporizer
slightly away from the flame. The small wedge shaped
heat baffles can also be removed from burner vanes to

OUTLET

INLET

STARFIRE BURNER

VAPORIZER COIL

BURNER VANES

DO NOT ALLOW

PIPES TO CONTACT

BURNER VANES !

Fig. 7-2 Starfire and octagonal burners with LP fuel vaporizer

OCTAGONAL

BURNER

VAPORIZER