MODEL LAF
M
TROUBLESHOOTING GUIDE AND CHART
WARNING!!! The following instructions are intended for qualified service personnel only. Dangerous line voltage circuits are
exposed during these procedures. Disconnect power at fuse before servicing the unit. Trouble shooting the LAF
M
can be
accomplished with minimal tools and by following the directions given below in the two sections of Troubleshooting Guide. The
first section deals with checks on determining the cause of a malfunction in your LAF
M
, and the second section explains how to
find a faulty component, or how to determine that a specific com-ponent is functioning properly.
Diagnostic Checks
1.
Powering up the LAF
M
a.
Make sure the prefilter screen and electronic filter are clean, dry, and pr
installed in the air cleaner.
b.
Turn on the LAF
M
and check to make sure all systems are in proper working order. In
each case, the system light should
be on and the fan should run.
-If the light does not come on, check the microswitch interlock for free movement as
well at the power source for correct
input.
-If the fan does not come on, check the fan motor, wiring to the motor, and
the power source.
-If both the system light and the fan motor operate, go to step 2.
c.
Test Technique
a.
With the air cleaner turned on, use a long shank insulated screw driver to penetrate
the pre filter screen and make contact
with the electronic cell. A definite “snapping”
sound and arcing should occur if the cell is properly energized.
b.
If no arcing is heard, check for continuity through the collector cell, then check for
failure of the cell due to broken wires,
cracked insulators, bent plates; and following
that, a possible failure in the voltage doubler or transformer.
d.
Cell Check
a.
To remove the electronic cell from the unit, loosen the two quarter turn fasteners and
allow the hinged intake to drop into
place. Remove the grid cap connector from the
cell and take the cell and pre filter from the unit.
b.
Close the hinged intake and check to see if the system light and the fan operate. If
they do, check the cell for a short
circuit.
c.
Replace the cell. If the Test Technique still does not produce a “snap” or arcing, go to
step
4.
e.
Check Power Supply
a.
Remove the power supply from the LAF
M
cabinet and check for continuity through the
circuit.
b.
Check continuity through the switch and go back through to the power source until the
problem can be located.
c.
Replace the power supply into the cabinet and check for correct line voltage by
powering up the system and using a
voltmeter to measure the input voltage at the
transformer.
d.
If voltage is correct (about 120V AC), then continue to check voltage at the secondary
side of the transformer (2000V
AC), and finally at the output (grid cap connector)
which should yield about 6000V DC.
e.
Any variation from these voltages could indicate a component failure where
replacement may be required.
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L A - F M I N S T A L L A T I O N M A N U A L & U S E R G U I D E
Pure n Natural Systems, Inc. | purennatural.com | 1-800-237-9199
