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Warning! Do not attempt to
calibrate this unit without proper
equipment such as a charged plate
analyzer. Adjustments to the
calibration controls should be
performed by authorized trained
personnel only.
Unit 50607/50609
Fan 4
Fan 3
Fan 2
< 4 Sec.
< 4 Sec.
< 4 Sec.
decay
decay
decay
48 in.
Unit 50606/50608
Fan 2
Fan 1
< 4 Sec.
< 4 Sec.
decay
decay
24 in.
Figure 7. Balance under < 10
volts. When set under lab
conditions, 5 volts is attainable.
Balance Adjustment
Using a charge plate analyzer, check
each fan's balance. Use the "BAL"
switches to zero the unit. If the fans
are a little out of balance with each
other use the fan adjustment pots to
equalize them. VR5,6 and VR1,2 on
48" model.
NOTE: Each fan has its own
balance circuit, however the alarm
TB-6529 Page 8 of 9
circuits tie them together. If one or
more of the individual fan balance
circuits are offset too much from the
rest it could cause the alarm not to
function correctly. If more than a
slight amount of adjustment is
required at any individual fan zone,
we recommend that the unit be reset
using the "Major Reset Adjustment"
Fan 1
instructions below.
Major Reset Adjustments - Use
< 4 Sec.
decay
this procedure only if the
"Balance adjustment" above does
not permit proper operation.
1. Turn key to "SET" position.
2. The potentiometers in this unit
have a 24-turn range. Reset all
of them by turning them at least
24 revolutions counter-clockwise.
3. Set the fan adjustment pots
(VR1, VR2, VR5 and VR6) to
center by turning them 12
revolutions clockwise.
4. Center the "BAL" control found
on the control panel on the right
end of the ionizer using the
following process. Place a
charged plate analyzer under any
of the fans, push and hold the "+"
BAL switch to find its most
positive point, use the "-" BAL
switch to find its most negative
point, calculate the midpoint and
set the balance using the "BAL"
buttons to that point. Example: if
the most positive point is +40V
and its most negative point is -
10V, you would set the balance
to ±15V.
5. Adjust each fan's output by
placing the charged plate analyzer
underneath it and using its
corresponding potentiometer to
zero its balance. Turn clockwise
for more positive and counter
clockwise for more negative.
6. Turn alarm sensitivity (VR4) 3
revolutions clockwise. Alarm
center (VR3) should be turned
clockwise until "PWR" light
turns green. VR3 should have
two full revolutions in which
the "PWR" light remains green. If
VR3 doesn't have two full
revolutions of green turn VR4
clockwise one turn and check
again. If VR3 has a lot more than
two full revolutions of green turn
VR4 counter clockwise and check
again. Finish by setting VR3 to
the midpoint of green range.
Health
There are no known health risks
associated with our devices. The
emitters work at about 4-6 kV and
can create ozone, but there have
been no significant measurement of
ozone from our emitter sets, as all
our existing units test well below the
OSHA limit of 0.05 ppm ozone. For
additional safety information, see
"Dispelling an Old Myth" written by
William Metz of Hewlett-Packard
published in Evaluation Engineering
magazine, September 2001.
© 2007 DESCO INDUSTRIES INC.
Employee Owned
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