Crescent CS7010 - Solution System; Functional Description; Overview

203Service Manual – CS7010™
30 - Solution System
Functional Description
Overview
The solution system delivers water, or detergent and water, to the oor for the scrub system. The solution
system includes the solution tank (main body of machine) and solution level (pressure) sensor, solution
shutoff valve, solution lter, solution pump or pumps (some models), solution solenoid valve, and the
associated plumbing to distribute solution to the nozzles at the three scrub brushes. A capped solution drain
hose allows you to drain the solution tank.
The solution ows to the scrub brushes any time the scrub system is enabled, the scrub deck is lowered
and the drive pedal is not in the neutral position. Programming options allow you to enable or disable
solution ow when the machine moves in reverse. When the scrub system is disabled, no solution will ow
to the brushes regardless of drive pedal or scrub deck position. The operator can enable the solution system
independent of the scrub system to pre-wet the oor before enabling the scrub and/or recovery systems.
Solution Flow Control - Non-EcoFlex™ Machines
On the non-EcoFlex™ machines, an electrically-activated solenoid valve controls the solution ow. The
solution is gravity-fed to the solenoid valve, and the solenoid valve output volume is controlled by the Main
Controller through a PWM (pulsed width modulated) output. The Main Machine Controller monitors the
solution level via a solution pressure sensor. As the solution level drops, the PWM output will increase
to compensate for the loss of solution (head) pressure in order to maintain a consistent solution ow rate
regardless of solution level in the tank. The solution solenoid’s coil circuit opens and closes (pulsing on and
off), pulling the valve diaphragm on and off its seat. This way the A1 Main Machine Controller can manage
the three different auto ow volumes and two different override ow rates.
On non-EcoFlex™ machines, the operator must manually mix the detergent with the water in the solution
tank if detergent is desired in the solution.
Solution Valve Desired Flow per Solution Setting
Solution Flow Setting Desired Flow (GPM)
1 1.0
2 1.5
3 2.0
4 2.5
5 3.0
Solution Flow Control - EcoFlex™ Machines
EcoFlex™ models use a solution control pump to supply the solution to the scrub brushes. On EcoFlex™
machines, the solution solenoid valve remains open when the solution control pump is running and the
solution ow is controlled by the pump output. This allows more precise mixing of the detergent/water mix
to the brushes. The EcoFlex™ detergent delivery line is plumbed into the solution line between the solution
pump and the solution solenoid valve.