Nilfisk-Advance CS7000 Fuel Cell EcoFlex, Service Manual

Page: 319 / 440

Solution System 319 Service Manual – CS7000
EcoFlex™ Detergent System
The EcoFlex™ detergent system uses dual diaphragm pumps (
M17
and
M18
) to pump detergent into the
solution flow upstream of the solution solenoid valve. Two detergent pumps are used when necessary to
ensure adequate detergent supply at the higher detergent and solution flow rates. The detergent pumps
receive PWM outputs from the A1 Main Machine Controller to regulate the detergent dispense rate
according to the solution flow rate. The detergent supply line from the detergent bottle is split into two lines,
one feeding each detergent pump. The two lines from the pumps merge into one line, which is then connected
to the solution hose upstream of the solution solenoid valve.
Extended Scrub System
Machines equipped with the extended scrub system will pump the recovered water from the recovery tank
to the scrub brushes when the solution tank is empty. The extended scrub system uses an additional pump
(
M25
) to pump the recovered water to the scrub brushes. In order for the extended scrub system to work, the
extended scrub system must be enabled, the solution tank low sensor must be actuated, and the float valve
in the recovery tank must be closed to indicate adequate water level in the recovery tank. Note that when
the machine is in the scrub mode:
• The solution pump will continue to run along with the extended scrub pump.
• The EcoFlex™ pumps will continue to add detergent to the recovered water.
Optional Hot Water System (LP and Diesel EcoFlex™ Machines Only)
On EcoFlex™ models equipped with the optional hot water system, the solution control pump pumps the
solution to a heat exchanger. The heat exchanger is plumbed to the engine cooling system and uses the
hot engine coolant to heat the solution as it circulates through the heat exchanger. The hot water system
increases the solution temperature approximately 50 degrees F. The heated solution is then mixed with
detergent and sent through the (open) solution solenoid valve and solution manifold to the brushes.
Note: If your machine is equipped with a hot water system, do not add detergent to the solution
tank as this can foul the heat exchanger.
Optional Wash Hose Kit
The optional wash hose kit uses a separate
low-pressure pump (
M23
) to pump solution from
the solution tank to the hose and nozzle located
behind the Operator seat. The wash hose kit
operates independently and does not require the
Operator to actuate the seat switch. A pressure
switch on the low pressure pump will switch on
the pump when the hose nozzle is opened and the
solution pressure in the hose drops.