Pre start checks for all portable dryers – Grain Systems PNEG-573 User Manual

Page 26

PRE START CHECKS FOR ALL PORTABLE DRYERS

FAN SWITCHES

burner

burner should ignite after a short
purge delay of approximately 10
seconds. Gas pressure should be
shown on the gauge. Adjust the
BURNER HI-LO FIRE THERMO-
STAT to 200

F, causing the burner

burner

to operate on hi-fire. This thermo-

thermo-

stat

stat is located on the front left side
of the dryer. Observe the gas pres-
sure on gauge, and turn the ther-

ther-

mostat

mostat to its minimum setting, caus-
ing the burner

burner

burner to cycle into lo-fire.

As the burner thermostat

burner thermostat

burner thermostat is turned

down the gas pressure should also
show a noticeable drop, indicating that
the hi-fire solenoid

hi-fire solenoid

hi-fire solenoid is closed and the

burner

burner is being supplied with less gas
through the lo-fire control valve.

lo-fire control valve.

sure the drive chain

drive chain

drive chain tension is prop-

erly adjusted and all sections of the
metering rolls

metering rolls

metering rolls rotate. Turn the UN-
LOAD switch OFF after these
checks are complete. The bottom

bottom

auger

auger will continue to run for 30 sec-
onds after the switch is turned OFF
to allow for cleanout.

The dryer fan and heater controls featuring: 1-pressure regulator, 2-low-fire

control valve, 3-high pressure solenoid, 4-low pressure solenoid, 5-hi-low

fire thermostat, 6-fuel supply line, 7-LP solenoid or supply ball valve(NG),

8-air pressure switch and 9-liquid filled gauge.

Set the hi-fire and lo-fire pressure
settings. Use the PRESSURE
REGULATOR for hi-fire and the ball
valve for lo-fire. The thermostat

thermostat

should cycle between hi and lo, ap-
proximately 4 to 5 times per minute.

Approximate settings should be:

LP Gas

Hi-Fire 6-15 lbs.
Lo-Fire 2-6 lbs.

Natural Gas

Hi-Fire 6-10 lbs.
Lo-Fire 1-3 lbs.

If the burner

burner

burner remains on hi-fire

and does not cycle, INCREASE the
regulator setting on the propane
models, or the supply valve on the
natural gas models in order to reach
the thermostat

thermostat

thermostat setting. If the burner

burner

remains in lo-fire and does not

To check the burner

burner

burner safety function,

first make sure the main GAS VALVE
is OFF. Turn the FAN switch ON and
allow the fan

fan

fan to start. Then, turn the

HEATER switch ON for that fan

fan

fan. The

dryer will shut down after 20 seconds.
The safety message, BURNER 1
WARNING FLAME NOT DETECTED
will appear. Restart dryer and repeat
other fans/heaters

fans/heaters

fans/heaters.

BURNER SAFETY

33333

44444

22222

11111

77777

88888

66666

55555

99999

Bump each FAN switch and observe
the fan

fan

fan rotation. The fan

fan

fan should run

counterclockwise. Sometimes on
three phase models all motors

motors

motors will

run backwards. They can easily be
reversed by interchanging two of the
three power supply wires

power supply wires

power supply wires. Re-

verse the two outside wires, L1 and
L3, and leave the middle one in the
same position.

Note: If the dryer is empty, the

fans or burners

fans or burners will not operate.
The fans

fans

fans cannot create enough

static pressure to engage the air

air

switch

switch. You will receive a LOSS OF
AIRFLOW message.

START the fan

fan

fan and turn the

BURNER switch to ON. Turn ON
the FUEL supply, and the

BURNER TEST FIRE