Recovery System157Service Manual – Advance 7765 / Nilfisk CR1500Recovery System Wiring Diagram – Standard Recovery SystemElectrical Circuit Description – Standard Recovery SystemThe Squeegee Fan Motor Solenoid (12) controls the hydraulic oil flow to the squeegee vacuum fan motor.• When the Squeegee Blade Switch on the instrument panel is set to the squeegee-lower position (SqueegeeBlade Switch position 2), the Squeegee Fan Motor Solenoid (12) is de-energized (blocked) to direct thehydraulic oil to the squeegee vacuum fan motor to run the motor.• When the Squeegee Blade Switch on the instrument panel is set to the squeegee-raise position (SqueegeeBlade Switch position 3), the Squeegee Fan Motor Solenoid (12) is energized (open) to allow the hydraulic oilto flow through the Squeegee Fan Motor Solenoid (12) and bypass squeegee vacuum fan motor.• When the Reverse Relay switches to position 87, diode D2 prevents voltage from the Reverse Relay fromenergizing the Squeegee Fan Motor Solenoid (12). This allows the squeegee vacuum fan motor to run whenthe machine is in reverse. (Not shown is that power from 87 is used to raise the squeegee when themachine is in reverse.)The Recovery High Switch (float switch) will switch on the High Recovery Warning Lightwhen the recovery tank is full.Also refer to the Solution System section and the Recovery System Hydraulic Diagramssubsection.7Squeegee FanMotor Solenoid (12)B-7CB815 A7 1921SqueegeeBlade Switch1 3 302Recovery High Switch44 1 2 41 1 2High RecoveryWarning LightRed7Battery 12 VDC+ -Bat.St.Ign.Acc.IgnitionSwitchR3Reverse Relay19 30 87 4887a D2High RecoveryWarning Light
