Elkhart Brass UBEC 1AT AUTO TANK Fill System - Manual (Page 14)

14
OPERATING INSTRUCTIONS
The AUTO TANK system is designed to automatically maintain the water volume in the tank of a
pumper. It is more specifically designed to be used on tanks that supply water to around-the-pump
foam systems.
System Operating Parameters
 The minimum size of the pumper tank is 500 gallons. There is no maximum tank size.
 There is no minimum pump discharge flow rate. The maximum discharge flow rate is 500 GPM.
 An Elkhart E3F electrically actuated ball valve is required.
 The supply water flow rate at the input to the tank must be at least 20% above the pump
discharge flow rate.
 The supply water must enter the tank through the fill tower to avoid potential over pressurization
of the tank, or pressure surges through the tank as the valve is opened and closed. Plumb from
the valve to the tank fill tower.
With all the system parameters met and operating in the automatic mode, the AUTO TANK system P/N
08899155 will keep the tank between 50% and 95% full, and AUTO TANK system P/N 08899156 will
keep the tank between 75% and 100% full.
THEORY
For efficient operation around-the-pump foam proportioning systems should be operated with low
pump intake pressure, less than 20 PSI. During normal operations pressurized water from a hydrant or
pumper in relay would be connected to the input of the pump. This excessive pressure at the input side
of the pump can cause the foam system to operate at partial capacity, fail to inject foam, or allow
water to enter the foam tank. The UBEC-1AT system continuously fills the tank as required so that low
pressure water is available at the input side of the pump.
During operations a supply line from a pressurized source of water (hydrant or pump in relay) is
connected to the input side of the control valve. A dedicated line connected from the output side of the
valve to the fill tower feed water to the tank. The TankVision display monitors the water in the tank. It
sends a signal to the control module to indicate a low or full level. In auto mode the control module
then sets the position of the valve as needed.
The control module allows the operator to select the automatic, manual, or off mode of operation.
MODES
On power-up the controller for system P/N 08899155 initializes to the same mode of operation it was
in when power went off, and system P/N 08899156 initializes in automatic mode even if it was in
manual mode when power went off.
No operator input is required for the TankVision to be operational. When power is on, the display will
be operating. The signal from the pressure sensor is processed and the volume of liquid in the tank
shows on the display.