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4.3 BASIC CIRCUIT DIAGRAMS
BASIC CIRCUIT DIAGRAM: GAS SUPPLY AND CONTROL SYSTEMS
Fig. 6
IN GAS - GAS INLET
VS - MAIN SAFETY VALVE
VM - POWERED MODULATION VALVE
SP - SPARK PLUG
TC - THERMOCOUPLE
BR-R - RAPID BURNER
BR-S/R - SEMI-RAPID BURNER
BR-A - AUXILIARY BURNER
TIMER BOARD - MAIN TOUCH-CONTROL INTERFACE BOARD
TOUCH DX BOARD - RH TOUCH-CONTROL INTERFACE BOARD
TOUCH SX BOARD - LH TOUCH-CONTROL INTERFACE BOARD