Gerni MH 4M Operating Instructions Manual

Brand: Gerni

Model: MH 4M

Category: High-pressure cleaners

Type: Operating Instructions Manual

This manual is also suitable for

107144382 E (04. 2017)

MH 4M - MH 5M

MH 6P - MH 7P

Operating

instructions

Original instruction2

1 Symbols used to mark instructions

WARNING & Safety instructions in these operating instructions which must be ob-

served to prevent risks to persons are marked with this danger symbol. Please note

the warning signs placed on the machine.

Before starting up your high- pressure washer for the first time, instructions must be

read through carefully. Save all the instructions for later use. Instructions contains:

Part 1: Safety instructions. Part 2: Instructions for use.

This symbol marks safety instructions related to connection of the machine to water

mains.

Do not inhale fumes.

Rebounding object.

Hot surface.

Steam.

Electrical components.

Dangerous voltage.

The jet must not be directed at persons, animals, live electrical equipment or the

cleaner itself. Do not direct the jet towards yourself or towards other persons in order

to clean clothes or footwear.

2 Safety instructions. For your own safety

WARNING! The high pressure washer may only be used by persons instructed in its

use and who have been expressly authorised to do so

• This appliance is not intended for use by persons with reduced physical, sensory or mental

capabilities or lack of experience and knowledge, unless they have been given supervision or

instruction concerning use of the appliance by a person responsible for their safety

• Machines shall not be used or maintained by children. Children should be supervised to en-

sure they do not play with the appliance

• Use of this machine is subject to the applicable local safety regulations and proper use.

Please refer to Opera ting Instructions for recommended use, maintenance and problem solving

• Never spray electrical equipment with water: danger for persons, risk of short-circuiting

150°C

Original instruction 3

• Never detach the high pressure hose while the machine is in operation.

HOT WATER: Danger of scalding! Never dismount high-pressure hoses at water tempera-

tures above 50°C.

• High temperature on the lance and hose after hot water use.

150°C

IMPORTANT: Prior to dismounting of the high-pressure hose, the machine should be

cooled down. After cooling down, stop the machine and close the shut-off cock. Then activate

the trigger of the spray handle to relieve the high-pressure hose of pressure.

• Beware of hot water and steam discharge up to 150°C when operating in steam stage.

• After use of the hot water/steam function the high-pressure cleaner must be flushed with cold

water for about 1 min. High temperature on the lance and hose after hot water use.

3 Before starting the cleaner DO READ INSTRUCTIONS FOR USE BEFORE USE!

Before use, check that the machine is safe and in proper condition and in upright posi-

tion on a plain and stable ground to ensure stability. Regularly check whether the power cord is

damaged or shows signs of ageing.

WARNING! Do not use the machine if a supply cord or important parts of the ma-

chine are damaged, e.g. safety devices, high pressure hoses , spray handle or lance

• Check the rated voltage of the machine before connecting it to the mains power supply. En-

sure that the voltage shown on the rating plate corresponds to the voltage of the local mains

power supply.

• For safety reasons, hoses, spray lances and other accessories should always be thawed prior

to use. MIN: 2°C/ 36°F.

NOTE: If your 3-phase cleaner was supplied without a plug, have it fitted with a suitable

3-phase plug with earth conductor.

WARNING! Before use of water jet, assure that the high pressure hose

with the spray handle is safely connected by an audible click to the lance

• High-pressure water jets can be dangerous if misused. The jet must not be directed at per-

sons, animals, live electrical equipment or the cleaner itself

• Do not direct the jet towards yourself or towards other persons in order to clean clothes or

footwear

• Do not use the cleaner when other people without appropriate protective clothing are in the

working area. Wear appropriate protective clothing, safety gloves, boots, hearing aids and hel-

mets with visor and eye protection

• When operating the spray handle, kickback forces are produced at the spraying device and

when the spray lance is held at an angle, a torque is also created. The spray handle and spray

lance must therefore be held firmly with both hands

• Check that cleaning will not result in dangerous substances (e.g. asbestos, oil) being washed

off the object to be cleaned and harming the environment

• During use of high pressure cleaners, aerosols may be formed. Inhalation of aerosols can be

hazardous to health. The employer shall perform a risk assessment in order to specify the nec-

essary protective measures regarding aerosols, depending on the surface to be cleaned and its

environment. Respiratory masks of class FFP 2, an equivalent or higher are suitable for the

protection against hydrous aerosols.

Original instruction4

• This machine has been designed for use with the cleaning agent supplied or recommended

by the manufacturer. The use of other cleaning agents or chemicals may adversely affect the

safety of the machine

• Risk of explosion – Do not spray flammable liquids. Do not clean delicate parts made of rub-

ber, fabric, etc. with the jet nozzle. Keep some distance between the jet nozzle and surface in

order to prevent the surface from damage

Combustion engine powered machines: Do not use combustion engine powered machines

indoors unless adequate ventilation is assessed by national labour authorities.

• Ensure that any exhaust emissions are not in the vicinity of air intakes

• Incorrect fuels shall not be used as they may prove hazardous.

• Do not operate belt-driven units without attached belt cover

• The machine must not be used in flammable or explosive environments. When using the ma-

chine, it must stand at least 1 m from buildings, etc.

4 Transport

For safe transport in and on vehicles we recommend to prevent the equipment from sliding and

tilting by fixing it with belts. For transport and storage at temperatures around or below 0°C,

anti-freeze should be drawn into the pump beforehand (Please refer to Operating Instructions).

5 Water connection

If the machine don´t have a watertank, the machine is only allowed to be connected

with the potable water mains, when an appropriate backflow preventer has been installed, Type

BA, according to EN 60335-2-79. The backflow preventer can be ordered thought Gerni Ser-

vicecenter. The length of the hose between the backflow preventer and the machine must be at

least 12 meters (min diameter 3/4 inch) to absorb possible pressure peaks. Operation by suc-

tion (for example from a rainwater vessel) is carried out without backflow preventer. The suction

set can be ordered thought Gerni Servicecenter.

WARNING! Water that has flowed through backflow preventer and high pressure washer

is considered to be non-potable.

6 Electrical connection

The connection of the electrical supply must be performed by an qualified electrician

and comply with IEC 60364-1. The earth wire must be connected to correct potential and it is

recommended that the electric supply to this machine should include either a residual current

device or another device that will protect the user against indirect contact. The electrical instal-

lation to the machine must be according to local regulations.

WARNING! Inadequate extension cords can be dangerous. If an extension cord is used, it

shall be suitable for outdoor use, and the connection plug has to be kept dry and off the ground.

It is recommended that this is accomplished by means of a cord reel, which keeps the socket at

least 60mm above the ground. Always unwind cord from the reels completely to prevent the

power cord overheating. Disconnect the power cord from the power source by pulling the plug

only (do not pull or tug the power cord).

Original instruction 5

7 Safety devices

• Thermal sensor: A thermal sensor protects the motor against overloading. The machine will

restart after a few minutes when the thermal sensor has cooled.

• Locking device on spray handle: The spray handle features a locking device. When the

pawl is activated, the spray handle cannot be operated.

HOT WATER: • Safety valve: Unacceptably high pressure is fed back without residual pres-

sure via a bypass line into the intake line of the pump when the safety device is tripped. The

safety valve is set and sealed at the factory and must not be adjusted.

• EXH thermal sensor: A thermal is mounted in the exhaust pipe, if the temperature exceeds

a pre-set temperature value, the heat function stops and a manual reset is needed.

8 Maintenance and repair

WARNING! Always switch off the mains disconnecting switch when leaving the machine

unattended

• Always remove the plug from the mains plug socket before carrying out maintenance work or

cleaning of the machine.

Combustion engine powered machines: NOTE! Before cleaning and maintenance of the

high pressure washer, always remove the spark plug cable.

Carry out only the maintenance operations described in the operating instructions. To ensure

machine safety, use only original Gerni spare parts. Do not make any technical modifications

to the high-pressure washer. Ensure that the machine is regularly serviced by authorized Gerni

dealers in accordance with the maintenance plan. Failure to do so will invalidate the warranty.

CAUTION! High-pressure hoses, fittings and couplings are important for the safety of the

cleaner. Use only high-pressure spare parts approved by Gerni!

• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or

similarly qualified persons to prevent hazards.

A18

A24

A20

A19

A22

A21

A20

A25

A23

A26

A10

A11

A12

A13

A15

A14

A16

A17

4 X

A27 A33

A38

A28 A34

A39

A29 A35

A40

A30 A36

A32A31

A37

°F

°C

CUT OUT

150

°F

210

300

°C

175

105

120

140

160

195

100

4 4

3 3

2 2

1 1

8888

B4.a

B4.b

B7 B9B8

C1.a

C1.b

✔

C1.c

10°

0°C/32°F

40°C/104°F

✔

BCAC

{

MAX

E8 A

°F

°C

✔

CUT OUT

150

°F

210

300

°C

175

105

120

140

160

195

100

E10.a

E10.b

Max 100°C/210°F

Max 32 bar

E10.c

CUT OUT

150

°F

210

300

°C

175

105

120

140

160

195

100

CUT OUT

150

°F

210

300

°C

175

105

120

140

160

195

100

MIN

E11

MAX

MIN

E12

E12.b

E12.c

E13

F1 F2 F3

4 4

3 3

2 2

1 1

4 4

3 3

2 2

1 1

4 4

3 3

2 2

1 1

40°C

✔

G1 C

F5 F6

0°C/32°F

H1.a

H1.b

H5 H6ABC

MIN

✔

Optional accessories / Option depending on model

Original instruction

Operating instructions

This high pressure washer has been designed for professional

use typically in following cleaning applications:

Agriculture, industry, transport industry, automotive cleaning,

municipal facilities, cleaning trade, construction industry, food

industry etc.

The pictorial quick reference guide

The pictorial quick reference guide is designed for helping you

when starting up, operating and storing the unit. The guide is

subdivided into 8 sections.

Before starting

DO READ SAFETY INSTRUCTIONS BEFORE USE!

Operating elements:

A1. Top cover release

A2. Receptacle for service crane and lifting ring

A3. Hot chimney

A4. Cable hook

A5. High pressure hose reel lock

A6. Spray lance

A7. Supply water connection

A8. Water inlet filter

A9. Tunable cable hook

A10. Parking brake

A11. Tool box

A12. Control panel

A13. High pressure hose connection on machine B4.a/B4.b

A14. High pressure hose reel

A15. Crank handle for High pressure hose reel

A16. Place for canister for detergent

A17. Footboard for tipping product

A18. Tank filler for Nilfisk AntiStone

A19. High pressure hose hook

A20. Side door release

A21. Safety warning label

A22. Tank filler for fuel

A23. Spray Gun holder

A24. Flow regulation knob

A25. Fuel level view

A26. Long detergent hose for external canister

A27. Service interval due/expired LED

A28. Nilfisk AntiStone low

LED

A29. Fuel low

LED

A30. Pump oil low1) LED

A31. Power ON LED

A32. Fahrenheit /Celsius indicator

A33. Boiler overheated indication LED

A34. No flame indication LED

A35. ECO-mode indication LED

A36. Hour counter; Set temp. reading; Error codes

A37. Pressure gauge

A38. Main switch with hot/cold water selection

A39. Temperature control knob

A40. Detergent metering knob

Unpacking and preparing the unit

B1. Remove safety traps from the cleaner.

B2. Remove the hose, lance and cable from the pallet.

B3. If wanted the hose reel can be changed from right hand

operation to left hand operation

B4.a Machines with hose reel: Remove transportation caps

from inlet and outlet. Connect the high pressure hose and

roll it up on the hose reel and lock hose reel on handle

(A)

B4.b Machines without hose reel: Remove transportation caps

from inlet and outlet. Connect the high pressure hose and

place it on the hook (B).

B5. Place power cord around cable hooks (A and B) and lock

the cable end at cable hook (B).

B6. The Nilfisk Antiscale device is set at the factory to a water

hardness of Slightly Hard. See table at maintenance

section.

B7. Release the wheel brake.

B8. Lift in the handle and pull the cleaner’s rear wheel of the

pallet and down to the floor.

B9. For easy tilting and maneuvering - kick the footboard and

push down on handle.

Lifting and strapping for transport

C1.a The safest way to lift the cleaner is to use a fork-lift truck

from the front or back end of the cleaner. (Not from side!).

C1.b Use the fixing points (A,B,C) when lifting with belts.

Do not lift in or strap to the plastic parts of machine as it

could become detached from the frame.

C1.c For safe daily lifting the GERNI accessory lifting set

(#107140912 + #301001090) is recommended.

C2. Use the fixing points (A,B,C) when securing with belts for

transportation.

Do not lift in or strap to the plastic parts of machine as it

could become detached from the frame.

Setting up the unit:

If your location is higher than 500 m (1625 ft) above sea level,

your burner may require re-adjustment for proper performance

and best fuel economy - Contact GERNI Service for assistance!

For location higher than 1000-2500 m might require an optional

burner kit - Contact GERNI Service for assistance!

Before using the cleaner for the first time, check it carefully to

detect any faults or damage. Run the machine only when it is in

perfect condition.

D1. The slope on which the high pressure cleaner is placed

must not exceed more than 10° in any direction.

OBS: ambient temperature should be above 0°C and not

higher than 40°C.

D2. Set the brake.

D3. Fill up detergent tank

D4. Fill up tank for Nilfisk AntiStone

D5. Fill fuel tank with fresh fuel, heating oil, DIN 51603-1

(without bio diesel). Diesel according to EN 590 (up to 7%

bio diesel) can be used in above 0°C ambient with the

following restrictions: Maximum storage time in high pres-

sure cleaner diesel tank: 1 month. Diesel of more than 6

months old is not allowed to be used. Diesel EN 590 from

an open container must not be used.

See fuel level (A) through window under the filling point.

Switching on the unit

OBS: The machine may be protected with antifreeze liquid from

the factory

- take care of point E8 below.

E1. Connect the water supply.

E2. Check if safety label has icon

, then a back flow

preventer is required.

Optional accessories / Option depending on model

Original instruction

E3. Turn cable hook and pull off the cable.

E4. Unwind hose and cable to full length before use.

E5. Connect to power supply.

E6. Switching on the cleaner. Cold water operation.

E7. Set Fahrenheit /Celsius: (A) by on/off switch in cold mode

and (B) toggle the temperature control to max

E8. Release safety lock and ventilate the machine for air by

activating the spray gun.

If antifreeze is in machine – catch the first 5 liters of fluid

discharge in a container for re-use.

When the water flow is even, continue with the following

steps.

E9. Connect the spray lance to the spray gun.

E10.a Cold water mode setting.

Switch on the cleaner to

Flow regulation is adjusted at pump handle (A).

E10.b Hot water mode (up to 100°C)

Select temperature, ECO-mode setting for optimal

standard cleaning.

Switch on the cleaner to

Flow regulation is adjusted at pump handle (A).

E10.c Steam mode

(over 100°C)

Turn the flow regulation

(A) completely right to end stop

(OBS: max. 32 bar by temperatures over 100°C!).

Select temperature above 100°C.

Switch on the cleaner to

E11. Pressure regulation on FlexoPower or Tornado Lance

E12.a Suction from internal detergent canister.

Set the desired concentration of (A) or (B) cleaning agent

at the dosing knob

E12.b Suction from external detergent canister:

Pull out the hose (B) from the chassis and connect to can-

ister. Set the desired concentration of (B) cleaning agent

at the dosing knob

E12.c Suction from 25 L canister: (only for none hose reel ver-

sion). Cut out the marked area with a knife to open the

strapping points. Strap canister to the back of the ma-

chine. Pull out the hose (B) from the chassis and connect

to canister.

E13. Using cleaning agents: Set the desired concentration of

(A) or (B) cleaning agent at the dosing knob

Spray the object. Allow the cleaning agent to work, de-

pending on the degree of soiling. Then rinse off with the

high pressure spray jet. Never allow cleaning agent to dry

out on the object as the surface may be damaged.

After using the unit or before leaving it unattended

F1. Switch to cold mode.

F2. Run in cold mode to cool down product.

F3. Switch off the cleaner. Turn the switch to position „OFF“.

F4. Disconnect supply lines.

F5. Close water tap.

F6. Squeeze the spray gun to release pressure.

F7. Lock the safety catch on the spray gun.

G1. Storing the cleaner below 0°C:

Remove the water inlet hose from the cleaner. Remove

the spray lance. Switch on the cleaner with the main

switch in position “Cold Water”. Operate the spray gun.

Gradually pour antifreeze (approx. 5 liters) into the water

tank (C). The machine is protected against frost when

antifreeze solution emerges from the spray gun. Lock the

safety catch on the spray gun. Switch off the cleaner. To

avoid any risks, store the cleaner temporarily in a heated

room before using it again. When the machine is put into

service again, the antifreeze solution can be collected and

stored for future use.

G2. Tilt and unscrew the filter glass

and empty it from water

and fill it up with antifreeze and replace it on the cleaner

again.

Maintenance & trouble shooting

H1.a Water inlet - Finger filter

: Unscrew quick coupling. Re-

move lock and filter and clean with water.

H1.b Water inlet – Large filter

: Tilt glas outward, unscrew glass

and clean with water.

H2. Fuel filling filter: Filter can be removed by fingers and

rinsed with clean fuel.

H3. Fuel filter: Open side door for access (A). Open hose clips

and replace the fuel filter (B). Observe applicable disposal

regulations. Contact GERNI for sparepart filter.

H4. Fuel Tank: Remove the drain plug and let the fuel pour

into an empty container. Flush with clean fuel. Observe

applicable disposal regulations.

H5. Pump oil: Check the pump oil quality: Check colour of

pump oil. If the oil has a dark grey or white shade, contact

GERNI service!

Top up cold pump with fresh oil to MAX if necessary.

H6. Flame sensor

: Remove the sensor and clean with a soft

cloth. Ensure that the sensor is correctly seated when

installing again - the symbols must face upwards.

EU Declaration of conformity

We,

Nilfisk A/S

Kornmarksvej 1

DK-2605 Broendby

DENMARK

Hereby declare that the

Products: HPW - Professional – Mobile Hot

Description: 230V, 400-460V, 1~, 3~, 50 Hz, IPX5

Type: MH 3M, MH 4M, MH 5M, MH 6P, MH 7P

Are in compliance with the following standards:

EN 60335-1:2012+A11:2014

EN 60335-2-79:2012

EN 55014-1:2006+A1:2009+A2:2011

EN 55014-2:2015

EN 61000-3-2:2014

EN 61000-3-11:2000

Following the provisions of:

Machinery Directive 2006/42/EC

EMC Directive 2014/30/EC

Noise Emission Directive 2000/14/EC – Conformity assessment

procedure according to Annex V.

- Measured noise level: 72-76 dB(A);

- Guaranteed noise level: 88-92 dB(A)

Hadsund, 28-09-2016

Anton Sørensen

Senior Vice President, Global R&D

Optional accessories / Option depending on model

Original instruction

B6. Antiscale adjustment

1. Open cabinet (A).

Measure the water hardness or ask your water supply company.

2. Adjustment knob (B) setting

according to rated water flow

mg/l Grains °dH °e °f ppm Ca Description 9-15

L/min

16-20

L/min

21-26

L/min

27-33

L/min

.0-17 0-1

0-7 0-8,8 0-12,5 0-50

Soft 0 0 0 0

17-60 1,1-3,5 Slightly Hard 0,5 1 2 2

60-128 3,6-7,5 7-14 8,8-17,5 12,5-25,1 51-150 Moderately Hard 1 1,5 2,5 3

128-180 7,6-10,5 14-21 17,5-26,3 25,1-37,6 151-300 Hard 1,5 2 3 3,5

>180 >10,5 >21 >26,3 >37,6 >300 Very Hard 2 3 3,5 4

Indications on Display

Indication lights Display Cause Remedy

Constant

0024

- The appliance is ready for operation.

- At power on to cold mode, hour coun-

ter is shown for a few seconds.

Flashing

- Water tap closed or water shortage.

- Detergent tank empty.

- Pressure regulation on the safety con-

trol blocks or the VarioPress

lance is

set to low water volume.

- Machine scaled.

- Check water supply.

- Refill detergent or set Detergent knop to “0“.

- Change setting on safety control block / Vario-

Press to allow full water flow.

- Contact dealer/service dpt.

Flashing

FLO - Machine has run for more than 120s

without propper water supply. Machine

shuts down to avoid pump over-

heating.

- Restart machine, if fault continues

- Contact dealer/service dpt.

Constant

FUE - Low fuel level.

- Cold water operation possible.

- Check fuel level and refill, error reset after 5

sec.

Constant

- Low Nilfisk AntiStone level

- Machine is still operational.

- Check Nilfisk AntiStone level and refill.

Constant Constant

- Service interval has expired.

- Machine is still operational.

- Contact dealer/service dpt.

Constant Flashing

- Service interval due in 20 hours.

- Machine is still operational.

- Contact dealer/service dpt.

Constant

HOS - Boiler overheated. Exhaust sensor

(EXT-H) has cut off fuel supply.

- Machine scaled.

- Boiler not serviced.

- Cold water operation is possible.

- Contact dealer/service dpt.

Constant Constant

LHE - Flame sensor (B7) is sooted.

- Ignition or fuel system failure.

- Cold water operation is possible.

- Clean flame sensor (B7).

- Contact dealer/service dpt.

Flashing Flashing

LHL - Boiler is over sootet and needs

service.

- Boiler is filled with diesel.

- Contact dealer/service dpt.

Constant Constant

HOP - Motor is overheated. - Turn main switch to “OFF” position - let the

machine cool down.

- Remove/disconnect extension cable.

- Possible phase failure.

- Have electrical connection checked.

- Contact dealer/service dpt.

Constant Flashing

Flashing

SEC

SEO

- Temperature sensor shorted.

- Temperature sensor is disconnected.

- Cold water operation is possible.

- Contact dealer/service dpt.

Constant Constant

FLF - Flow sensor fault. - Contact dealer/service dpt.

Constant

POL - Low pump oil.

- MPU is leaking oil.

-Check oil lever and refill.

- Contact dealer/service dpt.

Optional accessories / Option depending on model

Original instruction

Maintenance plan

Weekly As required After the first 50 operating

hours

When service lamp lights

Water ﬁlters

●

Check and clean tank inlet fuel filter

●

Check and replace Internal fuel filter

●

Clean the fuel tank

●

Grease quick couplings nipples for hose,

gun and lance

●

Check the pump oil quality

●

Change the pump oil - Contact dealer/service dpt. - Contact dealer/service dpt.

Other Faults

Indication lights Cause Remedy

Not ON

- Plug not connected to the electrical plug socket. - Put the plug into the electrical socket.

- Check fuse (see chapter Technical Data).

Pressure too low - High pressure nozzle worn out.

- Pressure regulation set to low pressure or

VarioPress-lance

set to low water volume

- Replace nozzle.

- Turn the twist grip on safety control block clock-

wise (+) or set VarioPress- lance

to higher

water volume (see chapter E10-11).

Machine is running with

pulsating pressure and makes

knocking noise

- Pump has drawn in air as the detergent tank is

empty

- Close detergent valve. Remove lance from gun.

Operate spray gun and let machine run until

air in pump is gone and the machine is running

normally again.

No detergent drawn in - Detergent tank empty.

- Dirt in detergent tank.

- Suction valve at cleaning agent inlet soiled.

- Top up detergent tank.

- Clean detergent tank.

- Remove suction valve and clean or replace.

Burner soots up - Fuel contamination.

- Burner sooted or adjustment incorrect.

- Contact dealer/service dpt.

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Gerni MH 4M Operating Instructions Manual

Brand: Gerni

Model: MH 4M

Category: High-pressure cleaners

Type: Operating Instructions Manual

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