Friedrich C-90B Manuale Utente
7
TROUBLESHOOTING ELECTRONIC AIR CLEANER
Electrical Troubleshooting Procedure for Electronic Air Cleaner
Make sure elec-
tronic cell is clean,
dry and properly
installed
tronic cell is clean,
dry and properly
installed
Make sure pre-fi lter and acti-
vated carbon fi lter are properly
installed, and carbon fi lter is
activating fi lter interlocking
switch lever.
vated carbon fi lter are properly
installed, and carbon fi lter is
activating fi lter interlocking
switch lever.
Replace the access
cover and turn the air
cleaner on. Check Low,
then Med, then Hi on
multispeed fan.
cover and turn the air
cleaner on. Check Low,
then Med, then Hi on
multispeed fan.
Check fan and
neon light.
neon light.
Both
Off
Off
Push interlock
switch with plastic
handled screw-
driver. Short from
cell frame to a hot
collector plate.
switch with plastic
handled screw-
driver. Short from
cell frame to a hot
collector plate.
Arcing
Yes
Yes
Electronic
Air Cleaner is
OK.
Air Cleaner is
OK.
Both
Off
Off
120 VAC Present
Jumper fan
switch contacts
- For each speed
switch contacts
- For each speed
in turn on multi-
speed fans.
speed fans.
Inspect cell for
- Bent Collector Plates
- Broken Ionizer Wires
- Dirt on Insulators
- Damaged or dirty
Contact Tabs
- Bent Collector Plates
- Broken Ionizer Wires
- Dirt on Insulators
- Damaged or dirty
Contact Tabs
Replace Cell
Infi nite
Resistance
Resistance
Cell OK
Check Contact Board for
coating on ground contacts
coating on ground contacts
Clean
Dirty
Clean contacts with fi ne
grain sandpaper or emery
cloth.
grain sandpaper or emery
cloth.
Check wire connections
are secured properly
are secured properly
OK
Replace Power Board
Assembly
Assembly
Replace Switch
Turn OFF power. Make
sure shaft on fan motor
rotates freely. Check for
open windings. Replace if
necessary.
sure shaft on fan motor
rotates freely. Check for
open windings. Replace if
necessary.
Repair or
replace cell
replace cell
No cell damage noted
Lamp
Off
Off
Fan
On
On
Replace Sys-
tem Switch or
fan motor.
tem Switch or
fan motor.
Check fi lter Inter-
locking Switch,
Access Cover
Interlocking
Switch, System
Switch.
locking Switch,
Access Cover
Interlocking
Switch, System
Switch.
With Ohmmeter, check
for short between
- Cell Frame and Ionizer
for short between
- Cell Frame and Ionizer
Section
- Cell frame and Collec-
tor Section
Light
Off
Off
Voltage above 120 VDC
Voltage
correct
correct
Replace Light
Voltage NOT
Correct
Correct
Check wiring back
through switch, power
cord, and outlet to cir-
cuit breaker or fuse.
through switch, power
cord, and outlet to cir-
cuit breaker or fuse.
Remove cell.
Replace access
cover, Check
neon light.
Replace access
cover, Check
neon light.
Check 100 VDC
voltage across
terminal on lamp.
voltage across
terminal on lamp.
Light OK, replace
complete power
supply
complete power
supply
Check Line 120
VAC power. Cor-
rect as needed.
VAC power. Cor-
rect as needed.
Fan
On
On
Light
On
Cell
Shorted
Shorted
START
Voltage
Below
70 VDC
70 VDC
Light
Off
Arcing
No
No
Fan
Off
Off
Cell
Damaged
Remove access
cover. Check
for correct input
voltage: 120 VAC.
Models P1 and P2
terminals on
power supply.
cover. Check
for correct input
voltage: 120 VAC.
Models P1 and P2
terminals on
power supply.
Lamp
On
On
Fan
Off
Off
Fan
On
On
TO USE THIS CHART:
1.
1.
Follow the steps in order. Don't skip around.
2.
Each time you isolate and fi x a problem, go back to
START.
START.
3.
Repeat ALL the steps until the air cleaner checks out OK
WARNING
Some of these steps expose dangerous high
voltage. Only a qualifi ed service technician
should attempt this procedure.
voltage. Only a qualifi ed service technician
should attempt this procedure.
WARNING
Electronic components on power supply
board are not fi eld replaceable. Attempt-
ed service will damage the board.
board are not fi eld replaceable. Attempt-
ed service will damage the board.