GSI Outdoors PNEG-552 service manual Special Features, Safety Circuit Shut Down Messages

3. Dryer Control Panel

Special Features

Dual Batch Drying Temperature Mode

To greatly improve quality in batch mode, reduce the plenum temperature at the end of the drying cycle. This will reduce peak temperature that the grain on the inside of the column attains and thereby reduce over-drying.

Enter dual batch drying temperature mode by switching ON dip switch number four (4), the fourth switch from the bottom, on the dip switches located inside the control box on the back of the computer control board. This enables two plenum and two grain temperature settings, high and low. Set these parameters the same way the single plenum and grain temperature settings are made. The first of each temperatures being set will be the low setting and will be indicated by the word “Low” on the screen. The second setting will be identified by “High” on the display screen.

Typically, the plenum settings would be 170 for low and 230 for high and the low grain temperature setting would be 10° to 20° below the normal moisture control temperature setting which becomes the new high setting.

Both capacity and quality will improve using this feature while operating in batch dry and cool or all heat modes.

Emergency Cooling Mode

To enter an emergency cooling mode, switch ON switch number seven (#7), which is the second switch from the top on the dip switch inside of the control box on the back of the computer control board. This initiates a mode in which only the dryer fan runs, in case there is a plenum temperature or grain high-limit warning. When either of these safeties shuts down the dryer, run the fan to help cool the grain and/or plenum high-limit back down to a safe level. After flipping the switch, press the Start button and only the fan will run for approximately five minutes.

Burner ON/OFF Operation

Due to changing fuel conditions and to aid in drying wheat and other low temperature grains in hot weather, an ON/OFF burner has been developed in recent years.

By moving the third switch, number six (#6), on the dip switch located inside the control box on the back of the computer control board to ON, the burner can be changed from a high-low burner to an ON/OFF burner. The burner will operate exactly the same as the high-low burner, however, when the setpoint is reached, the burner cycles OFF instead of switching to a lower pressure. The vaporizer cools much more quickly and allows a closer tolerance on the setpoint and to operate at lower temperature rises.

Safety Circuit Shut Down Messages

Vapor High Temperature

This shut down message indicates that the LP gas vapor temperature sensor, located in the gas pipe train downstream from the vaporizer has opened. This indicates that the vaporizer is running too hot and must be readjusted. This sensor is set at 200°F and automatically resets itself when cool.

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PNEG-552100 Series Dryer