Solution System; Functional Description; Solution Solenoid; Detergent Models - Nilfisk-ALTO Scrubtec R 6-71C 28C Service Manual

Service Manual – Focus II / Scrubtec R6 Rider Autoscrubber

Solution System

Functional Description

The Focus solution tank is incorporated directly
into the main body of the machine. A clear tube
on the left side of the machine below the fill cap
serves as a water level indicator for the tank.
At the outlet of the solution tank under the
machine, is a manual shutoff valve followed by
a serviceable solution filter that prevents debris
from entering the rest of the solution system
followed by a solution solenoid.

Solution Solenoid

The solution solenoid is located downstream
from the solution filter, and activates to allow
solution to flow to the scrub deck. To prevent
pooling of excess water on the floor when the
machine is stationary, the solenoid output
from the controller is disabled when the wheel
drive is not active. The rate of solution flow is
controlled by cycling the solution solenoid on
and off at varying duty cycles with a 6-second
cycle period.
Solution Solenoid
Indicator On-Time
One Bar 2 sec
Two Bars 4 sec
Three Bars 6 sec

Detergent Models

Machines that have on-board detergent mixing
use a pump-driven, detergent injection system. The detergent is stored in the removable detergent tank,
which has a suction hose from the detergent pump. The detergent pump draws the liquid from the detergent
tank and injects it into the solution line between the solution solenoid and the scrub deck. The flow rate of
the detergent is controlled by the Main Machine Controller using PWM.
Solenoid
Off-Time
4 sec
2 sec
0 sec
Solution
Solenoid
Solution
Filter
Shutoff
Valve
Solution System 67
Fill Cap
Sight
Tube
Solution
Tank Interior