Friedrich ELECTRONIC AIR CLEANER C-90A Manuale Utente

Page 8

Troubleshooting electronic air cleaner

Electrical Troubleshooting Procedure for Electronic Air Cleaner

Make sure elec-
tronic cell is clean,
dry and properly
installed

Make sure pre-filter and activated
carbon filter are properly
installed, and carbon filter is
activating filter interlocking
switch lever.

Replace the access
cover and turn the air
cleaner on. Check
Low, then Med, then Hi
on multispeed fan.

Check fan and
neon light.

Both
Off

Push interlock
switch with plastic
handled screw-
driver. Short from
cell frame to a hot
collector plate.

Arcing
Yes

Electronic
Air Cleaner is
OK.

Both
Off

120 VAC Present

Jumper fan
switch contacts
- For each speed

in turn on
multispeed fans.

Inspect cell for
- Bent Collector Plates
- Broken Ionizer Wires
- Dirt on Insulators
- Damaged or dirty

Contact Tabs

Replace Cell

Infinite
Resistance

Cell OK

Check Contact Board for
coating on ground contacts

Clean

Dirty

Clean contacts with fine
grain sandpaper or emery
cloth.

Check wire connections
are secured properly

Replace Power Board
Assembly

Replace Switch

Turn OFF power. Make
sure shaft on fan motor
rotates freely. Check for
open windings. Replace
if necessary.

Repair or
replace cell

No cell damage noted

Lamp
Off

Fan
On

Replace
System
Switch or fan
motor.

Check filter
Interlocking
Switch, Access
Cover Interlock-
ing Switch,
System Switch.

With Ohmmeter, check
for short between
- Cell Frame and Ionizer

Section

- Cell frame and

Collector Section

Light
Off

Voltage above 120 VDC

Voltage
correct

Replace Light

Voltage
NOT
Correct

Check wiring back
through switch, power
cord, and outlet to
circuit breaker or fuse.

Remove cell.
Replace access
cover, Check
neon light.

Check 100 VDC
voltage across
terminal on lamp.

Light OK, replace
complete power
supply

Check Line 120
VAC power.
Correct as
needed.

Fan
On

Light
On

Cell
Shorted

START

Voltage
Below

70 VDC

Light
Off

Arcing
No

Fan
Off

Cell

Damaged

Remove access
cover. Check for
correct input
voltage: 120 VAC.
Models P1 and P2
terminals on
power supply.

Lamp
On
Fan

Off

Fan
On

TO USE THIS CHART:
1.

Follow the steps in order. Don't skip around.

Each time you isolate and fix a problem, go back to
START.

Repeat ALL the steps until the air cleaner checks out OK

WARNING

Some of these steps expose dangerous high
voltage. Only a qualified service technician
should attempt this procedure.

WARNING

Electronic components on power supply
board are not field replaceable. Attempted
service will damage the board.