MAC/MTT-OPS-1
26 FEB 2019
SECTION 2
System Description
2-17
Aux Functions
AUX 1
– Controls customer-requested special
features or the Multi Water Cannon
functions. This feature is unique to specific tank
serial numbers.
AUX 2
– Controls either Suction Load Station
or Multi Water Cannon functions, if either is
installed.
S
UCTION LOAD STATION: If equipped, AUX 2 sends a
request to the hydraulic water pump drive circuit
to allow suction load pump drive motor operation
during a low water level condition while also
disabling the pump time-out feature. When turned
ON, this also disables use of any other spray
system function.
M
ULTI WATER CANNON: If installed, AUX 1 or AUX 2
will send a signal to the logic control panel in the
solenoid box, which then sends a signal to the
water cannon multi-plexing unit to activate an
additional water cannon (AUX 1 activates the front
bumper or deck water cannon, and AUX 2
activates the right rear water cannon) and
deactivate the controls for all other water cannons.
The same joystick controls are used to operate all
water cannons, but only one water cannon can be
controlled at a time.
• When switching between water cannons, the
multi-plexing unit will initiate an automatic 4
second delay to allow the previous water can-
non BFV to close.
• No water cannon will operate with both AUX1
and AUX2 switches ON.
H
OSE – Allows continuous water pump
operation for hose reel use while disabling
the use of any other spray system function.
Ensure all discharge function switches are OFF
when using HOSE function. Activating the HOSE
switch requests all discharge function to turn OFF
(spray heads, water cannon, drain, dump bar, and
foam).
Non-Pressure Discharge Function Descriptions
D
UMP BAR (GRAVITY) – Controls opening and
closing of the dump bar BFV when selected,
or automatically controlled when INTMNT mode or
AUTO mode is active.
Joystick Box Function Descriptions
The joystick box houses
logic controls for the
joystick and the FOAM,
NOZZLE, and BFV switches.
These switches and the
joystick control requests
for water cannon
operation.
If the system is equipped with the multi water
cannon function, the joystick controls will be
inactive for 4 seconds when switching between
water cannons.
F
OAM – Sends request for FOAM agent valve to
open or close.
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