Airstream 360 XC Land Yacht Owner's Manual page 102

AIRSTREAM 360 XC LAND YACHT OWNERS MANUAL
Oversensitive readings: Oversensitive readings can occur as a result of scum buildup on the tank walls,
abnormally high mineral content in the water, or incorrectly located holding tank probes. In these
situations, the monitoring system indicates higher levels than are actually present in the holding tank.
Certain cleaning products and food by-products can build up on the inside walls of the holding tanks
producing a layer of scum that can cause the monitoring system to read higher than the actual level. To
correct this problem, the holding tanks should be cleaned periodically (consult dealer or tank manufacturer
for cleaning instructions). If the problem persists after cleaning the holding tank, the ground probe can be
moved farther away from the other tank probes. The increased distance between the ground probe and the
other probes will decrease the sensitivity of the monitoring system.
Under sensitive readings: Under sensitive readings can occur if the mineral content of the water is
abnormally low or if the holding tank probes are located incorrectly. In this case, the monitoring system
indicates lower levels than are actually present in the holding tank. This problem can be corrected by
moving the ground probe closer to the other probes. Moving the ground probe closer increases the
sensitivity of the monitoring system.
The Ventline Adjustaboard™: In response to requests from the field for a means to adjust monitor
sensitivity without relocating holding tank probes, Ventline has developed the Ventline Adjustaboard™
(patent pending). This adjustable circuit board allows for field adjustments to monitor sensitivity. As tank
conditions or water mineral content changes, the monitor circuitry may be made more or less sensitive as
required. Pleas see Appendix A for adjustment instructions.
SOME OR ALL HOLDING TANK LEVEL LIGHTS NOT COMING ON
Possible Cause
No power
Verify ground at panel and ground probe with a
continuity tester.
Wire to tank resistor harness disconnected or
damaged.
Short circuit on circuit board
Corrective Action
Verify 12 volt DC power is available from the
battery or from the filtered side of the power
converter. Verify 12 volt DC power is present at
the circuit board.
Poor ground at monitor panel or at holding tank
ground probe.
Verify wire is connected and free of damage.
Replace if necessary. With the tank resistor
harness correctly installed and free from damage,
a jumper wire containing a 47Kohm resistor
placed between the holding tank ground probe
and any tank level probe should cause the
respective tank level lights to illuminate,
If the above test fails to illuminate the level
lights, repeat the test at the monitor panel. Refer
to the wiring diagram for the correct wires to
jump together. If lights illuminate, replace the
wiring between the panel and the tank resistor
harness. If lights do not illuminate, replace the
circuit board.
H-23