Hydra-Flex Aqua-Lab EVO User Manual - Manual (Page 6)

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Principles of Operation
The Aqua-Lab EVO was designed to meet the application requirements of the standard roll-over
automatic car wash with an available pump room to store chemical and equipment.
The system is set-up so that all that is required from the car wash controller is an output signal for
each valve. The EVO electrical control box uses that signal to open both the 3.5 watt air solenoid
valves and to start the pump.
The standard 10 GPM pump produces up to 225 psi of pressure which is regulated down to 200psi by
the bypass regulator. (The pump should never run above 225 psi.)
The 200 psi water flows into the Hydra-Cannon manifold which is fitted with 12 air-actuated valves
that are controlled by air solenoid valves. The water valves control the flow of water to each injector
or flow-thru rinse fitting.
The Chem-Flex injectors are color-coded based on the water flow needed for each individual
application, and combine with color-coded chemical metering tips to proportion the precise chemical
mix ratio. As water flows into the Chem-Flex injector, the velocity increases. As the velocity increases
the pressure decreases creating a vacuum which allows the precise amount of chemical to be pulled
into the chamber where it mixes with water.
This precise chemical mixing, along with the proper nozzle, creates an optimal display in the wash
bay.
Optional components that are included with the Istobal EVO system include an inlet water selection
valve, a foaming air wing, a system-protection pressure switch and the tri-foam manifold.
The inlet water selection value is operated using an air solenoid valve. This valve allows the option of
using two different water sources.
The foaming air wing is used as a blow-out frost protection. When the temperature drops below a
certain pre-set
point, air is forced through the lines, clearing them of water or solution that could
potentially freeze and cause damage.
The pressure switch is supplied to ensure that if the pump is not getting pressure, a signal will be sent
to the controller to shut the system down.
The tri-foam manifold is a three position quick-connect manifold that fits into a single port to support
triple foam or equivalent operations.