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F90A,B SELF-CONTAINED COMMERCIAL ELECTRONIC AIR CLEANER
68-0103-6 Revised 11-07
17
Fig. 20. F90 electrical troubleshooting procedure.
START
LED ON/FAN ON
NO
YES
YES
YES
NO
DAMAGED
"ON" LED OFF/FAN OFF
"ON" LED ON/FAN OFF
"ON" LED OFF/FAN ON
NO
NO
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
YES
YES
FAN
OFF
FAN
ON
YES
YES
CELL
SHORTED
INFINITE RESISTANCE
NO
YES
YES
ELECTRONIC COMPONENTS ON POWER SUPPLY BOARDS ARE NOT FIELD REPLACEABLE. ATTEMPTED SERVICE WILL DAMAGE
BOARDS . IF TROUBLESHOOTING INDICATES A POWER SUPPLY PROBLEM, REPLACE THE ENTIRE POWER SUPPLY ASSEMBLY.
TO USE THIS CHART:
1. FOLLOW THE STEPS IN EXACT SEQUENTIAL ORDER.
2. EACH TIME YOU ISOLATE AND FIX A PROBLEM, GO BACK TO START.
3. REPEAT ALL THE STEPS UNTIL THE AIR CLEANER CHECKS OUT OK.
NO
NO
MAKE SURE CELLS
ARE CLEAN, DRY,
PROPERLY INSTALLED.
CLOSE COVER OR
DEFEAT INTERLOCK.
TURN AIR CLEANER
ON. CHECK FAN
OPERATION AT LO,
MED, HI SPEEDS.
OBSERVR "ON'' LED.
PUSH TEST BUTTON.
LISTEN FOR
SNAPPING SOUND.
HOLD DOWN TEST
BUTTON. IS
"CHECK" LED LIT?
RELEASE TEST
BUTTON. IS
"CHECK" LED LIT?
IS "WASH" LED LIT?
TURN OFF AIR
CLEANER. SHORT
IONIZER TO FRAME
WITH TEST LEAD.
TURN ON AIR
CLEANER. IS
"WASH" LED LIT?
CLEAN CELLS,
WIPING IONIZER
WIRES. INSPECT
CELLS FOR
DAMAGED IONIZER
CONTACTS.
REPLACE OR
REPAIR CELLS.
REMOVE CELLS. IS
"WASH" LED LIT?
AIR CLEANER OK.
REPAIR OR REPLACE
CELL(S)
WITH OHMMETER,
CHECK FOR SHORT
BETWEEN:
- CELL FRAME AND
COLLECTOR
TERMINAL.
- CELL FRAME AND
IONIZER TERMINAL.
IS "CHECK" LED LIT?
CHECK INPUT
VOLTAGE TO LED.
REPLACE LED.
REPLACE POWER
SUPPLY AND LED
DRIVER BOARD.
INSPECT CELLS FOR:
- BENT COLLECTOR
PLATES
- BROKEN IONIZER
WIRES
- DIRT ON
INSULATORS
- DAMAGED IONIZER
OR COLLECTOR
CONTACT TABS
REPLACE CELLS
NO
CELLS OK.
REPLACE SWITCH.
CHECK INPUT VOLTAGE
TO INTERLOCK SWITCH.
TURN AIR CLEANER OFF. OPEN COVER.
DEFEAT INTERLOCK. CHECK FOR INPUT
VOLTAGE TO SWITCH.
CHECK WIRING BACK
THROUGH POWER CORD
AND OUTLET TO CIRCUIT
BREAKER OR FUSE.
CORRECT WIRING
OR FUSING.
ADJUST/REPAIR/
REPLACE
INTERLOCK
SWITCH.
TURN AIR CLEANER OFF. OPEN COVER.
REMOVE ACCESS PANEL. DEFEAT INTERLOCK.
TURN AIR CLEANER ON. JUMPER SWITCH
CONTACTS FOR EACH SPEED IN TURN.
REPLACE
SWITCH.
JUMPER ORANGE
WIRE TO WIRE FROM
SPEED CONTROL
MODULE TO
FAN MOTOR
HOLD TEST BUTTON
DOWN; DOES "CHECK"
LED LIGHT?
CHECK FOR
VOLTAGE
TO "ON" LED.
REPLACE POWER
SUPPLY AND LED
DRIVER BOARD.
REPLACE LED.
REPLACE
POWER
SUPPLY.
TURN UNIT OFF. OPEN COVER. REMOVE
ACCESS PANEL. DEFEAT INTERLOCK. TURN
AIR CLEANER ON. CHECK FOR CORRECT
INPUT VOLTAGE TO POWER SUPPLY: CHECK
BOARD TERMINALS P1 AND P2.
PUSH TEST BUTTON. LISTEN FOR SNAPPING
SOUND.
CHECK WIRING BACK THROUGH SWITCH,
INTERLOCK, POWER CORD,
OUTLET, AND CIRCUIT BREAKER.
CORRECT WIRING.
M1525B
TURN OFF POWER. MAKE SURE FAN
MOTOR ROTATES FREELY. REPLACE
FAN MOTOR IF NECESSARY.
REPLACE SPEED
CONTROL MODULE
FAN
ON
FAN
OFF
TURN OFF POWER.
MAKE SURE FAN
MOTOR ROTATES
FREELY. REPLACE
FAN MOTOR IF
NECESSARY.
F90A
F90B
1
1
1
RISK OF ELECTRIC SHOCK
THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO REDUCE RISK
OF ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN CONTAINED IN THE OPERATING
INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO.
WARNING