MAC/MTT-OPS-1
26 FEB 2019
SECTION 2
System Description
2-15
• If a switch is depressed and the correspond-
ing LED does not illuminate, check to ensure
that the POWER switch is ON and the water
level EMPTY light is not flashing. If the switch
LED still does not illuminate, a malfunction
may exist. Contact Mega Product Support
immediately at US toll free: 1-800-345-8889,
or Direct: 1-505-345-2661.
• If the selected switch LED illuminates, but the
component on the water tank is not
functioning, then the associated function
component (water-way valve, spray head, or
water cannon) may have malfunctioned.
Contact Mega Product Support immediately.
Water Pump Protection Features
SOFT START AND STOP – The water pump is protected
from sudden starts and stops whenever the pump
is turned ON or OFF. This protection is
implemented in the spray control system by
commanding the appropriate proportional
hydraulic control valve to open or close slowly.
This prevents hard starts or stops that would
reduce water pump service life.
L
OW WATER PROTECTION – The water pump is
automatically turned off when a low water
condition is detected. This prevents the water
pump from overheating due to running dry.
N
O-FLOW CONDITIONS – Whenever ALL water
discharge valves are closed, the water pump is
automatically turned off after approximately 100
seconds. This feature prevents the water from
heating up as a result of the water pump impeller
spinning in a sump with no flow. Otherwise, the
heating of the static water will also heat the water
pump, causing deterioration of grease and
premature bearing failure.
Master Switch Box Extended Function
Descriptions
POWER – Turns POWER ON and OFF to cab
controls and the controllers in the solenoid
box.
P
UMP – Sends request for pump
engagement/disengagement. The
appropriate controller will activate the hydraulic
circuit to slowly ramp-up or ramp-down the water
pump.
The water pump switch will flash whenever the
switch is on and the following conditions apply:
• Low water condition is sensed (EMPTY LED is
flashing).
No flow condition is sensed (for about 100 seconds
no waterway valves are open)
Do not engage/disengage the water pump above
LOW IDLE. Engaging/disengaging the water pump
above low idle will result in water pump
component damage and reduced service life.
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