Schwank SER(IR) - Manual (Page 24)

GP-MSER-BX-11A
SER / IR Manual
RD: March 2006
RL: 11A
KH
Legend:
MCU = Main Control unit
PSW = Air Pressure Switch
HV = High Voltage
YES
YES
YES
Page 20
20. TROUBLESHOOTING GUIDE FOR SER / IR-60
SET THERMOSTAT TO CALL FOR HEAT
COMBUSTION AIR BLOWER STARTS
NO
YES
NO
CHECK WIRING CONNECTION AND
REPLACE BLOWER MOTOR IF DEFECTIVE
AIR PROVING SWITCH CLOSED
110 VOLTS AT INGITION CONTROL
NO
Æ ENSURE THAT THE AIR INTAKE AND FLUE
ARE NOT BLOCKED
Æ ENSURE PRESSURE TUBE IS CONNECTED AND
NOT BLOCKED
Æ CHECK AIR PRESSURE WITH MANOMETER
Æ CHECK AIR PROVING SWITCH IS CLOSING
WHEN BLOWER IS RUNNING
Æ REPLACE DEFECTIVE SWITCHES
SPARK ACROSS IGNITER OR
IGNITER/SENSOR GAP
NO
ÆPLEASE SEE APPENDIX 1 SPARK IGNITION
CIRCUIT
Æ PULL IGNITION LEAD AND CHECK SPARK
Æ CHECK SPARK GAP, ADJUST TO 3/16” IF
NEEDED USING THE GROUND PRONG ONLY
Æ SPARK OK?
REPLACE IGNITION CONTROL
Æ CHECK IGNITION CABLE, GROUND WIRING
CERAMIC INSULATOR AND CAP, AND CORRECT
Æ CHECK BOOT OF THE IGNITION CABLE FOR
SIGNS OF MELTING OR BUCKLING
Æ TAKE PROTECTIVE ACTION TO SHIELD CABLE
AND BOOT FROM EXCESSIVE TEMPERATURES
CHECK THERMOSTAT
CONTINUES ON NEXT PAGE
CHECK FOR LINE VOLTAGE POWER SUPPLY