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SECTION V
COMPONENT DESCRIPTION/REPLACEMENT
A. HEAT SECTION
The ML-310 dryer uses three (3) types of heat sources: natural gas, liquid propane (L.P.) gas, and steam.
Natural gas and L.P. gas
are not directly replaceable. The gas valves need to be modified to use other than the
type of heat specified on the nameplate.
1. The MLG-310 gas dryers utilize a Direct Spark Ignition (DSI) module to monitor that a flame is established.
If for some reason the flame signal is lost, the DSI module will shut off the gas valve and not retry ignition
(no try to restart the flame). A spark of approximately 14,000 volts is used to establish a flame. The DSI
module will turn the gas valve on and ignitor/flame-probe will spark for 8-seconds attempting a flame. Each
time the dryer calls for heat the microprocessor controller (computer) will send a 24 VAC signal through the
exhaust hi-limit, sail switch, and oven hi-limit. At that point, the DSI module will try for ignition.
DIRECT SPARK IGNITION (DSI) SYSTEM COMPONENTS/FUNCTIONS
Johnson (DSI) Control Module P/N 128935
ADC (DSI) Control Module P/N 128973