Note: When installing a liquid gas solenoid valve on LP models, do not over tighten the connection into the inlet side, as the inlet orifice may become partially blocked.
4.Main Gas Orifice: With fuel shut off and gas purged from system, proceed as follows:
a.Disconnect the plumbing support brackets from the pipe train.
b.Disconnect gas solenoid valve coils. Be sure to mark which one goes where.
c. Lift pipe (with orifice, solenoid valve and other parts attached), straight up and remove from fan/heater housing. Orifice and other parts can now be removed from pipe train, if desired.
5.Reassemble: To reassemble parts, reverse the disassembly procedure and check the following:
a.Make sure all parts are thoroughly cleaned and open.
b.Use a dependable brand of high temperature pipe caulking compound when assembling gas connections. Apply only a light coating onto male threaded end of fittings.
c. Solenoid valves and gas regulators are directional and must be properly installed. Do not attempt to connect gas solenoid valve by applying force to the valve core stem as it may ruin the unit.
d. Make sure all electrical wires are properly connected. Refer to wiring diagrams.
Pressure Guage
Firing Valve | Main Solenoid |
Cycle Solenoid
Bypass Valve
Adjustment
Relief Valve
Vapor High Limit
Regulator
LP pipe train.
METER ROLL SERVICING
This dryer is equipped with SCR metering roll drive assembly. The metering rolls are driven by a separate DC type electric motor. The speed of the motor is variable, and is controlled by an electric SCR control within the main control box.
MAIN CONTROLS
1.SCR speed control: The metering roll speed pots on the front of the control box regulate the speed of the DC motor which drives the metering rolls.
The scale of adjustment is from 0 to 999 which represents the flow of grain past the metering rolls as a percent of the maximum grain discharge rate for the dryer. The maximum setting of 999 provides a maximum 100% discharge rate. The chart at the top of next page shows max. discharge rates for different lengths of dryers.
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