Garnet SeeLeveL II 709 Series Installation Manual & User Manual page 17

a high concentration of the chemical in the tank and approximately 30% full
of fresh water. Hopefully you can drive for 2-3 days allowing the tank levels
to rise through normal use. We recommend that you exceed the level that
you see the system report when the tank is empty. After the sloshing and the
soaking hopefully the build-up will be flushed away when the tank is drained
and flushed. If you still have symptoms the treatment may required a few more
times. The waste did not build up on the tank wall in one day, so it may not
dissolve in one treatment! The build-up looks like water to the system since it
holds a significant volume of water in the build-up area. It takes much more
than a film or piece of tissue to cause the error.
What to do if the system reads a zero water level at all times, or does not reach
100%
1. This may be due to excessive tank wall thickness. We have tested the sender
on an actual tank with 3/8" wall thickness to ensure proper operation. If you
encounter an excessively thick tank wall the symptom will be a zero reading
regardless of the actual tank level. The cross check would be to test the sender
on another tank by taping it in place temporarily, if it now works the tank wall
thickness is well over 3/8". You can also use a 1 gallon jug or a 5 gallon pail as
a test tank to crosscheck operation of the sender.
2. A symptom we have seen is the sender will not indicate 100% when the tank is
full. If the sender is positioned too high on the tank, then water cannot reach
high enough on the sender for it to read 100%. The top of the sender must be
at least ¼" to ½" away from the top of the tank to allow for wall thickness.
3. Another possibility is a tank wall thickness issue that may occur at the corners
or edges of the tank. This has not been a common issue, and the only
correction you can make is to move the board slightly lower, away from the
thick area.
What to do if sender delamination occurs
We have had reports of the senders literally falling off the tanks or showing
1.
serious delamination. This is likely caused by a lack of tank surface preparation.
Surface prep is very simple, wipe the area to be adhered to with products like
Pro Bond, alcohol, or acetone. Do not use thinners because they leave residues
which attack the adhesive. Ambient temperatures of less than 60°F or 15°C
prevent the bonding agents in the adhesive from working properly; use a heat
gun to warm the tank surface if necessary. Also be sure the surface is dry, again
a heat gun is the best way to dry the bonding area. Finally, the surface of the
tank must be smooth. The adhesive works much better on smooth surfaces,
if necessary use an orbital sander with fine grit paper (220 grit) to quickly
accomplish the desired smoothness.
2. Another possibility is the wiring harness pulling on the sender. Make sure the
wiring to the tank sender is well supported so that it does not put a load on
the sender. Be sure to support all connecting harnesses; do not let the board
support the harness, this will in time cause delamination of the board from
the tank. One simple way to do this is to use Gorilla tape across the top of the
sender at a 90 degree angle to the sender orientation, with the wiring held in
place by the tape. The wires from the sender must be routed straight up or to
the right for reliable operation.
SeeLeveL II 709 Series Display Manual
How to protect the sender from road spray and debris
3. On installations where the holding tank is exposed to under chassis road spray
and flying rocks etc. we recommend the use of an auto body undercoat, which
is easily purchased in auto parts stores. This tar based material clings well to
the senders and protects from water and debris.
One material in particular is 3M Professional Grade Rubberized Undercoating,
4.
product code 03584. Another product that works well is a Dominion Sure Seal
rubberized undercoating such as Gravel Guard Rocker Guard Coating.
5. After the system is completed and tested apply the undercoat over the
complete board using two coats. Do not use lacquer, enamel paint, or plastic
paint for auto bumpers as these contain chemicals that will dissolve the
conformal coating on the board and cause malfunctions.
How to avoid damaging the display when mounting
1. If mounting the display in a metal panel or wall there is a risk of permanent
damage due to a jagged opening or too small of an opening. The metal panel
can short-circuit the display rendering it inoperable and requiring the installer
to replace it. Ensure that the edges of the cutout are smooth and that no
material is bent outward where it can dig into the display. Make sure that the
cutout is large enough so that the display can be easily inserted without having
to angle it. There is a ½" border all around the display to cover the edge of the
hole, so if the hole is a bit larger than the minimum requirement it will still be
covered by the display.
2. When fastening the display to the panel, make sure that it is centered in the
hole and not resting on one edge.
3. Non-conductive mounting spacers are available to help prevent damaging the
display. Contact Garnet for further details.
How to avoid damaging the display or pump switch due to excessive current
1. Please be aware that the water pump switch circuit has a limitation on current
draw of 7.5 amps, some large pumps can draw over 10 amps. These high drain
pumps must use a relay or the display console printed circuit will overheat and
damage the display permanently.
2. If the 12V supply line from the electrical panel does not have a 7.5 amp
fuse rating, please be sure to install the supplied fuse holder with a 7.5 amp
automotive style fuse inline on the +12V red wire.
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