Description Of The High Pressure Cleaner; The High Pressure Cleaner; Safety Circuits; No-Voltage Release - Nilfisk Gerni N/G-6900 A/C Betriebsanleitung

The construction and function of the high
pressure cleaner
Your new high pressure cleaner is con-
structed as shown in the functional dia-
gram and photo No. 2 - 4. The machine
consists of a low pressure side and a high
pressure side with a built-in boiler system
and high pressure pump (2.16). From the
water inlet (2.9), the water is carried
through the float valve (2.23), into the
water box/pre-heater (2.7). At maximum
water level the float valve shuts off the
water supply. From the water box the
water is sucked into the three-cylinder
pump which is driven by the electric
motor (2.14). From the low pressure
chamber of the high pressure pump the
water is sucked through the suction
valves into the cylinders. Here the water is
pressurised and pumped through the
pressure valves into the high pressure
side through the flow switch (2.21) and
into the coil (2.6) where it is heated to the
required temperature by hot water or
steam. The operating temperature is set
and adjusted on the switch (2.22). The
water is pumped through the pressure
outlet (2.31) into the high pressure hose
(2.25), to the pistol (2.26), the lances
(2.27) and out through the nozzles (2.1)
and (2.2).
The pressure of the high pressure cleaner
is adjustable on the pressure regulation
handle (2.3) and can be read on the pres-
sure gauge (2.24). If the water pressure
No Voltage Release
Protects against re-start of the high pres-
sure cleaner following voltage supply fail-
ure.
Stop the high pressure cleaner by setting
the start/stop knob (2.29) in position "0"
and start the machine.
Flame Control (N/G-6900A)
Your machine may be equipped with

flame control.

The flame control (2.8) ensures correct oil
burner operation. Any combustion fault
conditions will cause the oil burner to be
switched off after 20 seconds. When the
DESCRIPTION
exceeds the normal working pressure the
built-in safety valve (2.20) will open the
by-pass and thereby prevent damage to

the high pressure cleaner.

From the fuel tank (2.11) the fuel is
sucked through the fuel filter (2.13) and
on to the burner.
The high pressure cleaner can operate
with either cold water, hot water or steam.
In case of hot water or steam operation
the water is heated by the oil burner.
The high pressure cleaner (N/G-6900A is
equipped with a steam bloc)(2.19). For
recirculation the water may be heated to
130°C.
Detergent is added via the detergent
valve (2.17) from an external detergent
tank (2.15). By means of the built-in injec-
tor it is possible to dose up to 6% deter-
gent.

SAFETY CIRCUITS

oil burner is switched off the machine will
continue operation as a cold water clean-
er.
Stop the high pressure cleaner by setting
the start/stop knob (2.29) in position "0".
Remedy the fault (see "Faultfinding") and
re-start the machine.

Overheating Protector

The overheating protector (2.4) will stop
the high pressure cleaner if the boiler
temperature exceeds 140°C.
Stop the high pressure cleaner by setting
the start/stop knob (2.29) in position "0".
Let the high pressure cleaner cool for 15
2.1 High pressure jet
2.2 Low pressure jet
2.3 Pressure regulation handle
2.4 Overheating protector
2.5 Thermostat sensor
2.6 Heating coil
2.7 Water tank/pre-heater
2.8 Flame sensor (N/G-6900A)
2.9 Water inlet/water filter
2.10 Burner
2.11 Fuel tank
2.12 Fuel level sensor
2.13 Fuel filter
2.14 Electric motor
2.15 Detergent tank (external)
2.16 High pressure pump
2.17 Detergent valve
2.18 Bypass valve
2.19 Steam device(N/G-6900A)
2.20 Safety valve
2.21 Flow-switch
2.22 Vater level sencor
2.23 Float valve
2.24 Pressure gauge
2.25 High pressure hose
2.26 Pistol
2.27 Lances
2.28 Operating thermostat
2.29 Switch (start/stop)
2.31 Pressure outlet
2.33 Oil glass
2.36 Cap for oil waste box
2.37 Oil waste box
2.38 Crane hook
3.1 Detergent filter
3.2 Drain of fuel
min. and re-start the machine.

Overload Protector

Thermal switches in the pump motor
housing protect the electric motor against
overload. The control voltage for all con-
trol and safety functions(N/G6900A) is
24V low-frequency voltage. In case of
overload the high pressure cleaner will be
switched off.
Stop the high pressure cleaner by setting
the start/stop knob (2.29) in position "0".
Let the motor cool for 15 min. and re-start
the machine.
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