Schwank bistroSchwank 2-Stage - Manual (Page 36)

2100 / IO 100 Manual
IM110107
RD: MAY 2014
R.L. 4A
36
19. TROUBLESHOOTING GUIDE
TURN HEATER ON
24 VOLTS ±10% TO DSI CONTROL
24 VOLTS OUT FROM CONTROL
24 VOLTS AT GAS CONTROL
SPARK ACROSS IGNITER:
IS HIGH VOLTAGE SPARK OK ?
MAKE SURE THE MANUAL
SWITCH ON THE GAS VALVE IS
‘OPEN’ AND THAT THERE IS GAS
SUPPLY TO THE VALVE.
*CHECK 120 V AT PRIMARY TRANSFORMER
*CHECK VOLTAGE OUT AT SECONDARY.
*IF THERE IS NOT 24V TO SECONDARY....
.......REPLACE THE TRANSFORMER
*ENSURE GAS IS TURNED ON AT VALVE.
*CHECK ELECTRICAL CONNECTIONS AT
CONTROL & GAS VALVE.
*CHECK 24V WIRING CONTINUITY FROM DSI
IGNITION CONTROL TO GAS VALVE, RE-
PLACE WIRES IF NECESSARY.
*PERFORM IGNITION LEAD TEST DESCRIBED
IN “SPARK IGNITION CIRCUIT”.
*CHECK DSI MODULE IGNITION POST FOR
DEFECTS.
*SPARK IGNITER MAY BE OUT OF POSITION.
*CHECK BOOT OF THE IGNITION CABLE FOR
SIGNS OF MELTING OR BUCKLING. TAKE
PROTECTIVE ACTION TO SHIELD CABLE &
BOOT FROM EXCESSIVE TEMPERATURES.
*CHECK CERAMIC INSULATOR FOR CRACKS *
*CHECK SPARK GAP, 1/8”-3/16” .
*CHECK IGNITION CABLE, AND GROUND
WIRE
*CHECK 24V WIRING FROM TRANSFORMER
TO IGNITION CONTROL / AND CHECK IF
CORRECT GAUGE OF WIRE FOR DISTANCE.
*REPLACE WIRES IF NECESSARY.
*CHECK FOR 24 VAC ACROSS GAS VALVE
TERMINALS ON CONTROL. IF NO VOLTAGE,
.........REPLACE CONTROL.
YES
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
IF 24V IS PRESENT AND VALVE DOES NOT
OPEN.......REPLACE VALVE
GAS VALVE OPENS.
NO