Audiovox PRO-0412/C Installation Manual

INSTALLATION GUIDE FOR:
PRO-O412/C
3-12 BAR COPPER ELEMENT DEFOGGER
WITH TIMER AND ON-OFF PANEL SWITCH
ADD PRO-OO20 FOR GRIDS NEEDING MORE BARS
Printed in U.S.A.
FORM NO.128-3881
Fig.2
IMPORTANT NEW INSTRUCTIONS
REVISED DEFOGGER GRID LAYOUTS AND WIRING METHODS
TO INSURE PROPER OPERA TION OF THIS DEFOGGER. THE FOLLOW-
ING NEW INSTRUCTIONS MUST BE EXACTLY FOLLOWED.
1. Total grid current must not be less than 6 AMPS (the window will
not heat properly if it is below this).
2. Total grid current must not be more than 19 AMPS (the timer or
grid may fail or operate incorrectly if you exceed 19 AMPS).
3. Usethegrid examples provided in this manual as a guide butjfin
doubt, use the formula provided to calculate the actual grid
current your car will use.
=~4.This kit contains sufficiel1t ~aterials to make a grid upto 12bars
'{:Jc cby 5 feet wide. If your grid will exceed this. youiequiieaPRb-
~-'7!:0020accessory k!l -:'::~-,e;c-"';;"
HOW To SET-UP THE GRID PATTERN :
1- Measure your window to determine how many grid lines
(horizontal heating bars) your vehicle requires by the following
method (see Fig. 1 ).
A. Measure the height of the window at the edge of the window
since this is usually the smallest dimension (H).
B. Measurethe width of the window at the top and at the bottom
(W1 and W2).
C. Add W1 and W2 and divide by (2). This is the average width of
your window. -c c
Fig. 1
3. Determining the grid grouping required to achieve the idea[
current range of 6 AMPS to 19 AMPS.
A In our example we want 13 bars that will each be 38'c wide.
B. The formula to determine the current of this grid is:
a. ,012times the width (38") divided by the number ofbars in
each group (1) times the number of groups (13). This is
then divided into 13.2 volts (the average voltage of most
cars).
./ b. .012 (x) 38 = .456 (divided by) 1 = .456 (x) 13 = 5.9 (13.2
divided by 5.9 =2.2 AMPS)
As you can see this is way below the 6 AMP minimum,
c. Therefore. we cannot use 13 bars. So we now have a
choice, we can either delete one bar and make if a 12 bar
grid or we can close-up the spacing between bars by
overlapping the clear carrier tape and make it a 14 bar
grid.
d. For our example we will cfose-upthespacing and make it
a 14 bar grid. Now we can group the bars into groups of 2
bars each (14 is evenly divisible by 2). This will give us 7
groups of 2 bars each. (It is not divisible by 3 or 4.)
e. Using the formula we get
.012 (x) 38 (divided by) 2 (x) 7 = 1.59. We divide this into
13.2 and get 8.3 AMPS. This is within our 6 to 19 AMP
range.So our grid willfook like Fig. 3.
NOTE:
In our example the window is 18" high and W1 is 36" and
W2 is 40". So we add W1 (36") to W2 (40'1 and divide by (2)
36 + 40 = 76" divided by 2 = 38" "
Our average width is 38".
Our height is 18".
FIG. 3
2. Determine how many horizontal grid lines you require by the
following method (See Fig. 2).
A. The normal spacing between bars is 1%" (1.3751.
B. You must allow 5/a" clearance at the top and bottom of the
grid.
C. Therefore. divide the height of your window by 1 %" (1.375).
NOTE: In our example the height is 18". Divided by 1 %" we
get 13 lines.
D. Actually, we can fit 14 bars in 18" of height, but the top and
bottom bars would almost be touching the edges of the glass
area and this is not acceptable.
E. Now we want 13 bars but is this suitable for resistance
grouping to ~chieve the ideal current range of 6AMPS to 19
AMPS? For grouping, the number of lines must be evenly
divisible by 2, 3 or 4. As you can see, (13) is not evenly
divisible by any of these. Therefore. we can only use 13 bars
as single line groups provided it meets the current range of 6
AMPS to 19 AMPS. How we determine this will be explained
next
NOTE:
We have provided typical groupings for most windows on
the following pages. You will only need to use the formula
if your window doesn't work with one of the pictured
examples.