Friedrich C-90A Troubleshooting electronic air cleaner, Start, should attempt this procedure

Troubleshooting electronic air cleaner

Electrical Troubleshooting Procedure for Electronic Air Cleaner

START

TO USE THIS CHART:

Make sure elec-

1.

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

tronic cell is clean,

2.

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

dry and properly

START.

installed

3.

Repeat ALL the steps until the air cleaner checks out OK

Ð

WARNING

Make sure pre-filter and activated

Some of these steps expose dangerous high

carbon filter are properly

voltage. Only a qualified service technician

installed, and carbon filter is

should attempt this procedure.

activating filter interlocking

switch lever.

Ð

Check Line 120

Check filter

Lamp

Replace

Replace the access

VAC power.

120 VAC Present

Interlocking

On

System

cover and turn the air

Correct as

Î

Switch, Access

Î

Switch or fan

Fan

cleaner on. Check

needed.

Cover Interlock-

motor.

ing Switch,

Off

Low, then Med, then Hi

Ï

Fan

Î

Replace Switch

System Switch.

on multispeed fan.

On

Both

Lamp

Ð

Off

Turn OFF power. Make

Off

Light

Jumper fan

Fan Î

sure shaft on fan motor

Check fan and

Î

switch contacts

rotates freely. Check for

Fan

neon light.

On

- For each speed

Off

open windings. Replace

On

in turn on

if necessary.

Both

Fan

Off Ð

multispeed fans.

On

Ð

Push interlock

Î

Remove cell.

Light

Remove access

Voltage

Check 100 VDC

Voltage

Light OK, replace

switch with plastic

Replace access

cover. Check for

complete power

handled screw-

Î

Î

voltage across

Î

Arcing

cover, Check

Off

correct input

correct

terminal on lamp.

Below

supply

driver. Short from

No

Î

neon light.

voltage: 120 VAC.

70 VDC

cell frame to a hot

Models P1 and P2

above 120 VDC

Voltage

Light

collector plate.

terminals on

Ð Off

Voltage

power supply.

Arcing

Î

Replace Light

Inspect cell for

NOT

ÐYes

-

Bent Collector Plates

Cell

Correct Ð

Electronic

-

Broken Ionizer Wires

Î

Repair or

Check wiring back

Air Cleaner is

-

Dirt on Insulators

Damaged

replace cell

through switch, power

OK.

-

Damaged or dirty

cord, and outlet to

Contact Tabs

circuit breaker or fuse.

Ð

No cell damage noted

With Ohmmeter, check

for short between

Cell

- Cell Frame and Ionizer

Î

Replace Cell

Section

Shorted

-Cell frame and Collector Section

		Infinite
		Ð Resistance
				Check Contact Board for			Dirty		Clean contacts with fine
		Cell OK	Î					Î	grain sandpaper or emery
				coating on ground contacts
									cloth.
						Clean
			Ð
	WARNING
					Check wire connections
Electronic components on power supply					are secured properly
board are not field replaceable. Attempted					ÐOK
service will damage the board.
					Replace Power Board
					Assembly

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