Rheem RGPH Installation Instructions Manual page 39

FIGURE 34
INTEGRATED FURNACE CONTROL (IFC) WHITE RODGERS 50A62-101
(SILICON-NITRIDE IGNITER)
1. SET FAN SWITCH TO AUTO
2. SET THERMOSTAT TO CALL
FOR HEAT
INDUCED DRAFT BLOWER
MOTOR STARTS
10 SEC. PREPURGE
PRE-PURGE CONTINUES
IGNITER WARMS UP
AND GLOWS RED
20 SECONDS WARMUP
START
YES
NO
YES
THE IFC WILL
PERFORM A SELF-
TEST OF THE IGNITER
AND DRAFT MOTOR
CIRCUIT. IF THERE IS
AN IGNITER FAULT,
BAD CONNECTION TO
THE IGNITER, OR A
BAD GROUND
CONNECTION, THE
DRAFT MOTOR WILL
STOP AFTER A FEW
SECONDS AND LOCK-
OUT.
IF THE PRESSURE SWITCH DOESN'T
CLOSE WITHIN 60 SEC. THE IOM WILL
STOP FOR 5 MIN. AND RETRY
YES
NO
YES
WHITE-RODGERS 50A62-101
INTEGRATED FURNACE CONTROL (IFC)
TROUBLESHOOTING GUIDE
(SILICON-NITRIDE IGNITER)
• REMOVE (IFC) COVER, CHECK LIGHTS
• CHECK LINE VOLTAGE POWER
POWER LED ON
NO • CHECK LOW VOLTAGE TRANSFORMER
YES
MICROPROCESSOR STATUS "OK" LED ON
NOTE: "OK" LED WILL FLASH TO INDICATE
TWINNING CIRCUIT FAULTS
YES
CHECK FOR 24 VAC FROM
"W" TO "C" ON IFC
• CHECK LIMITS, (CLOSED)
• CHECK WIRING
• CHECK PRESSURE SWITCH, (OPEN)
• CHECK FOR 115VAC TO DRAFT MOTOR
YES
REPLACE IOM MOTOR
• CHECK FOR BLOCKED VENT
• CHECK AIR PROVING SWITCH (CLOSED)
• CHECK WIRING TO IGNITER
• CHECK FOR 60 TO 90VAC AT IGNITER,
TERMINALS AND AT (IFC) TERMINALS
YES
REPLACE IGNITER
NO
REPLACE (IFC)
NO CHECK THERMOSTAT
WIRING
NO
REPLACE SWITCH
REPLACE (IFC)
NO
IF WIRING TO
DRAFT MOTOR IS OK
NO
REPLACE SWITCH
REPLACE (IFC)
NO
IF WIRING TO
IGNITER IS OK
39