Grain Systems PNEG-1717 - Manual (Page 58)

10. Service
58 PNEG-1717 CE Approved GSI/FFI Portable Dryer Manual
Heater Parts Removal and Installation
1. Flame sensor: Disconnect the wire connector, and unscrew the flame sensor.
2. Regulator and gas solenoid valve(s): Removal and refit of gas components must be carried out by
a qualified gas fitter. The gas regulator and solenoid valve(s) are directional and must be connected
as indicated.
NOTE: Do not over tighten component connections.
3. Main gas orifice:
a. Disconnect plumbing support brackets.
b. Disconnect valve electrical connections and mark to ensure correct refitting.
c. Lift gas assembly, straight up and remove. Orifice and other parts can now be removed.
4. Reassemble: To reassemble is reversal of disassembly:
a. Ensure all parts are cleaned.
b. Apply sealants in accordance with EN746-2:1998.
c. Reconnect electrical connections.
d. Pressure test for leaks.
Metering Roll Servicing
This dryer is equipped with SCR metering roll drive assembly including a variable speed DC motor.
Main Controls
1. SCR Speed control 7" (FFI): Maximum speed (999 setting) is 4.3 RPM.
2. DC Electric motor: After a period of inactivity, the brushes on the DC motor may need releasing.
This can be done with a light tap on the side of the motor with a rubber mallet.
3. Speed reducer gearbox: No adjustment necessary. Provide light lubrication to the chain drive.
4. If a foreign object jams the metering rolls, the unloading auger will continue until the dryer
shuts down (2 minute).
Check the cause of stoppage:
Remove chain from drive - beware that the chain may be under tension.
Attempt to rotate metering rolls with a pipe wrench.
If rolls rotate then the stoppage is caused by damage to the drive train.
How to Clear a Jammed Meter Roll (All Power “OFF”)
Attempt to release by back and forth rotation of the roll using a pipe wrench on the drive hub.
If this does not release, locate the blockage and access via access doors inside the plenum.
Keep hands away from sprocket teeth to avoid injury from chain backlash, as a
result of torsion build up in the system caused by the jam.