Delfin MTL501WD Installation instructions

Read this manual carefully before using the vacuum cleaner
Delfin
srl
Strada della Merla, 49/a
10036 Settimo Torinese (TO) Italy
Tel. [phone]
Fax [phone]
www.delfinvacuums.it
[e-mail]
MISTRAL industrial
vacuum cleaners
Operator's and maintenance manual
MTL 501 WD
MTL 802 WD

Introduction
© Copryright DELFIN srl
ESSEDI Technical Manuals – Torino (ITALY)
http://www.essedimanuali.it
Edition October 2002
This manual provides all the information needed to use and service your vacuum cleaner. Good
operation and durability depend on proper maintenance and careful use.
Before leaving the factory, this particular model has undergone stringent tests to ensure utmost
reliability. Always check however to make sure the vacuum cleaner has not been damaged during
transport in such a way as to affect operation and safety.
This manual should be considered an integral part of the vacuum cleaner and must be kept
together with the unit until this is scrapped.
In case of loss of or damage to the manual, ask DELFIN for a new copy.
The technical details contained in this manual are the property of DELFIN and should be deemed
of a confidential nature.
Even partial reproduction of the graphic project, the text and the illustrations is legally forbidden.
Some details shown in the illustrations in this manual may be different from those of your vacuum
cleaner. Some component parts may have been removed for greater clarity.
For easier reference, this manual is split into sections, identifiable by specific graphic symbols.
The subjects dealt with in this manual are those expressly required by "Machine Directive EEC
98/37" and the technical details shown are those provided by the manufacturer at the time of
compilation.
This manual must be kept in a place accessible to all the personnel charged with operating and
servicing the vacuum cleaner.
In case of any doubts, always immediately phone the After-Sales Service.
The competent Law Court for all disputes is that of TURIN (Italy).
This manual must be kept with the vacuum cleaner in case of resale!

Contents
Information section 1
1.1 Identification of main parts 2
1.2 Accessories provided 4
1.2.1 Optional accessories 6
1.3 Identification details of manufacturer 7
1.3 Marking plate 7
1.4 Intended uses 8
1.5 Allowed environmental conditions 8
1.6 Noise levels 8
1.7 Storage 8
1.8 Scrapping 8
1.9 Technical details 9
1.9 Warranty 10
Safety section 11
2.1 Safety details 12
2.2 Safety precautions 13
2.3 Safety plates and symbols 16
2.4 Outstanding risks 17
2.5 Applied directives 17
Installation section 18
3.1 Handling 19
3.2 Installation 20
Operation section 22
4.1 Description of controls 23
4.2 Work cycle 24
4.3 Emptying the container 26
Maintenance section 29
5.1 Informative notes 30
5.2 General safety precautions 30
5.3 Maintenance operations 31
5.4 Replacing the filters 32
5.5 Troubleshooting 34
Spare parts section 36
6.1 Recommended spare parts 37

1
INFORMATION SECTION

MISTRAL 501 WD/802 WD
2
1.1 Identification of main parts
Model 501 WD.
9
3 4
1
5
2
6
8
7 10
1) Push handles
2) Cover release fasteners
3) Controls
4) Power cable with plug
5) Suction pipe coupling point
6) Container for vacuumed material
7) Wheels
8) Fixed castors
9) Motor protection cover
10) Liquid drainage pipe

Information section
MISTRAL 501 WD/802 WD
3
Model 802 WD.
2 9 4
1
3
11
5
6
8
7 10
1) Push handles
2) Cover release fasteners
3) ON / OFF switches
4) Power cable with plug
5) Suction pipe coupling point
6) Container for vacuumed material
7) Wheels
8) Fixed castors
9) Motor protection cover
10) Liquid drainage pipe
11) Lateral handles

MISTRAL 501 WD/802 WD
4
1.2 Accessories provided
Model 501 WD
10
3 2 5 7 6
4 8 9 1
11
1) MT. 2,5 SV2511210 – BLACK HOSE D. 38
2) AA2643 – FLOOR BRUSH FOR LIQUIDS MM. 400 D. 40
3) AA2644 – FLOOR BRUSH FOR DUST MM. 400 D. 40
4) AA2648 – PVC LANCE D. 40
5) AA2647 – PVC BRUSH D. 40
6) AA1027 – PVC RUBBER CONNECTION FOR ACCESSORIES D. 40
7) ( N. 2) AA2646 –PVC EXTENSION MT. 0,5
8) AA2642 – DOUBLE BEND D. 40
9) AA2651 – RUBBER CONNECTION FOR HOSE 38/60 02774
10) AR4678 – COMPLETE KIT WITH POLYESTER FILTER AR4676 (MTL 501 WD)
11) AR4679 – COMPLETE KIT WITH PPL FILTER AR4677 (MTL 501 WD)

MISTRAL 501 WD/802 WD
5
Model 802 WD
1 2 3 4 5 6
1) AA1045 - ALUMINIUM LANCE D50x500
2) AA2591 – BLACK HOSE D50 MT.2,5 WITH RUBBER CONNECTIONS
3) AA2592 – PVC BRUSH D50
4) AA2638 – IRON REDUCTION D80/50
5) AR3479 – COMPLETE KIT WITH FILTER FOR LIQUIDS (MTL 602-802)
6) AR3480 – COMPLETE FILTER FOR DUST (MTL 602-802)

MISTRAL 501 WD/802 WD
6
1.2.1 Optional accessories
MODEL 802 WD
Absolute HEPA filter code AA 2627 Ø 390 - H=110.
The absolute filter permits trapping the finest dust particles which have not been trapped by
the primary polyester filter. If the vacuum cleaner features this specific filter, its filtering capacity will
have to be periodically checked.
Important!________________________________________________________________
During these operations, wear individual protection devices such as gloves, protective eyewear
and dust mask.
_______________________________________________________________________________
To change the filter, switch off the vacuum cleaner and remove the plug from the power socket,
release and remove the upper cap and then loosen nut (A). Remove the absolute filter, place it in a
plastic bag, close this and dispose of it according to applicable laws for the type of vacuumed dust.

MISTRAL 501 WD/802 WD
7
1.3 Identification details of manufacturer
Delfin srl
Strada della Merla, 49/a
10036 Settimo Torinese (TO) - Italy
Tel. [phone]
Fax. [phone]
www.delfinvacuums.it
[e-mail]
1.4 Marking plate
In compliance with the Machine Directive on vacuum cleaners, the machine is fitted with CE
plates.
When contacting the manufacturer or dealer, always quote the details shown on the
vacuum cleaner plate.
Model 501 WD Model 802 WD.

MISTRAL 501 WD/802 WD
8
1.5 Intended uses
These specific models of vacuum cleaners have been designed, built and protected for the
vacuum cleaning - using special filters - of dry, non-flammable and non-harmful dusts and
for vacuuming non-flammable and non-corrosive liquids.
Any other use is considered IMPROPER.
The vacuum cleaner is in any case intended for professional industrial use.
1.6 Allowed environmental conditions
To ensure the correct operation of the vacuum cleaner, this must be positioned protected
against atmospheric agents (rain, hail, snow, fog, dusts in suspension, etc.) with an
environmental running temperature between 5°C and 45°C and relative humidity not above
70%.
The work environment must be clean, well-enough lit and devoid of explosive atmosphere.
1.7 Noise level
Noise level readings were taken in accordance with the provisions of UNI 7712 standards.
Sound tests performed on this specific vacuum cleaner model show an acoustic pressure of
74 dB (A) for the model 501 WD
75 dB (A) for the model 802 WD
Important!
Pursuant to articles L.D. 277/91, workers exposed to sound pressure levels above 85
dBA must be protected by special individual protection devices.
It is therefore necessary, if such working conditions exist, to provide workers with
such approved individual protection devices and to inform them of the risks relating
to noise exposure.
1.8 Storage
Remove the filter and clean it, empty the container and store the vacuum cleaner in a place
protected against atmospheric agents with a temperature between 0°C and 40°C. Cover
with a nylon sheet to prevent accumulation of dust.
1.9 Scrapping
In case of scrapping, all the component parts of the vacuum cleaner will have to be
disposed of through adequate disposal channels in accordance with applicable legislation.
Before scrapping, all plastic and rubber parts will have to be separated from the electrical
material.
Parts made of plastic, aluminium and steel only may be recycled if collected by special
centres.

Information section
MISTRAL 501 WD/802 WD
9
1.10 Technical details
Use Dust / Liquids Dust / Liquids
Voltage Volt - HZ 230 - 50/60 230 - 50/60
By-pass motors N° 1 2
Powers KW - Hp 1,15 / 1,5 2,3 / 3
Max. vacuum mm H
2
O 2500 2500
Max. air flow M
3
/h 180 360
Filter surface cm
2
4.400 7.000
Capacity Lt. 50 80
Vacuum diameter Ø mm 50 80
Noise level dB(A) 74 75
Isolation Class II II
Hight cm 90 108
Weight Kg 20 30
Dimensions cm 52 X 40 50 X 48
Filtre for liquids and floating device Yes yes
501 WD
802 WD

MISTRAL 501 WD/802 WD
10
1.11 Warranty
Delfin guarantees this vacuum cleaner model for a period of 24 months from the date of
purchase indicated on the tax document at the time of delivery of the vacuum cleaner by
the seller.
The warranty shall be invalidated in the event of the vacuum cleaner having been repaired
by unauthorised third parties or of equipment or accessories being used that have not been
supplied by Delfin or which have not been recommended or approved by Delfin or whose
serial number has been removed or altered during the warranty period.
Delfin undertakes to repair or replace, free of charge, those parts which, during the
warranty period show manufacturing faults. Repairs shall be made in the Delfin facilities
only or in a Technical Assistance Centre indicated by us and machines shall be sent to us
carriage free (transport costs to be paid by the user, unless otherwise agreed).
The warranty does not cover any cleaning of working parts.
Faults not directly attributable to materials or manufacture shall be examined only in our
facility or in a Technical Assistance Centre indicated by us. If claims appear unjustified, all
the costs relating to repair and/or replacement of parts shall be charged to the buyer.
The purchase tax document shall be shown to the technical personnel making the repairs
and must accompany the vacuum cleaner dispatched for repair.
The warranty does not cover: accidental damage, caused by transport or carelessness or
inadequate treatment, or improper use not in compliance with the instructions in the
instruction manual, or in any case by occurrences not dependent on normal operation or
use of the vacuum cleaner. Delfin declines all responsibility for any damage to persons or
things caused by bad or improper use of the vacuum cleaner.
All disputes shall be referred to the Law Court of Turin (Italy).
The manufacturer declines all liability in the following cases:
•Failure to send the warranty Certificate
•Failure to follow the instructions
•Use of non-original spare parts
•Failure to service the machine properly

11
SAFETY SECTION

MISTRAL 501 WD/802 WD
12
2.1 Safety details
The person in charge of safety shall be responsible for informing workers about the risks
associated with vacuum cleaner operation.
The obligation also exists of training workers so they are able to protect themselves and
others.
Failure to observe basic safety regulations and precautions could cause accidents during
vacuum cleaner operation, maintenance and repair. Accidents can often be avoided by
recognising potentially dangerous situations before these occur. Operators should be aware
of potential hazards and be trained and skilled enough. They should also have the tools
necessary to perform these duties properly.
Delfin shall under no circumstances be deemed liable for accidents or damage caused by
use of the vacuum cleaner by personnel not properly trained or who use it in an improper
manner, as well as by even partial failure to comply with the safety regulations and
intervention procedures indicated in this manual.
The safety precautions and warning notices are indicated in this manual and on the
product.
Unless these hazard messages are heeded, the operator could become involved in
accidents with serious consequences for him/herself and for other people.
The safety messages are highlighted by the following symbols:
Important!
Unless these messages are heeded, operator injuries could occur.
Warning!
Unless these messages are heeded, vacuum cleaner damage could occur.
Delfin cannot foresee all possible circumstances capable of representing a potential hazard.
The warnings in this manual and on the products should not therefore be deemed
exhaustive.
In the event of tools, procedures, work or machining methods being used that are not
explicitly recommended by Delfin, make sure no hazards exist for operators and others.
Only ever use original DELFIN spare parts
Delfin declines all liability in the event of
non-original spare parts being used.

Safety section
MISTRAL 501 WD/802 WD
13
2.2 Safety precautions
Important!
The following indications are, by themselves, not enough to fully protect against all
the hazards that could arise during vacuum cleaner operation. These will have to be
integrated with common sense and the experience of the operator, both of which are
crucial factors for preventing accidents.
Each section of this manual lists further specific safety precautions for the various
operations.
Maintenance jobs must always be performed with the power plug detached from the
power point.
The employer must inform and train the user according to the provisions of applicable laws.
Before using the machine, prepare and train yourself by reading this manual carefully. Use
of the machine by untrained and unauthorised persons is forbidden.
Using the machine to vacuum toxic substances is forbidden unless this has been equipped
with special filters required for the specific type of dusts. Such filters must be explicitly
requested by you.
Do not vacuum flammable materials or substances or which could cause explosions (fuels,
solvents, etc.). To vacuum such materials, the machine must be built with Anti-explosion
Motor and Electric System and this must be requested by you explicitly.
Do not vacuum corrosive substances unless the machine is equipped with containers
suitable for this purpose (Stainless-steel AISI 304).
Use of the machine without the supplied filters is not recommended.
If the filters are correctly fitted, the machine will not eject any objects.
If the machine is used to vacuum toxic-harmful substances, the container must be emptied
and the filters cleaned using adequate individual protection devices, selected according to
the type of substances to be vacuumed.
Never rest miscellaneous materials on the horizontal protection guard.
The machine casing containing moving parts must not be removed by the user.
When using the machine, mind other people, especially children.
Use the machine cautiously on slopes and ramps. Do not change direction on gradients.
Make sure the parked machine remains stable by operating the braked wheel.

MISTRAL 501 WD/802 WD
14
During cleaning operations, maintenance jobs or when changing parts, the starter switch
must be off and the machine must be disconnected from the power mains by removing the
cable from the socket.
Only skilled persons should carry out repairs.
During use, mind the power supply cables and avoid crushing or pulling these.
Periodically check the mains power cable to ensure this is not damaged.
In the event of the cable being damaged, the machine must not be used.
In the event of the cable, plugs or couplings being replaced, make sure these are protected
against water spray and check mechanical strength.
Never pull the machine by means of the power cable and the vacuum pipe.
Motor brushes and burnt-out fuses must be replaced by DELFIN or authorised dealers.
Always use original spare parts.
The user is responsible for disposing of vacuumed substances in accordance with
applicable laws.
After 10 years of use, we recommend sending the machine for a complete overhaul to
DELFIN srl.
The machine is supplied with: instruction manual, Exploded Spare Parts drawing, Test
Sheet, Warranty Slip, Approval Certificate.
In the event of Customers fitting a tool to the machine not supplied by DELFIN , make sure
the safety conditions required by Machine Directive 98/37 EEC are complied with and in
any event, DELFIN is unable to accept liability for any problems arising from use of such
tool.
The vacuum cleaner must not be operated in a corrosive or explosive environment.
Always make sure the vacuum cleaner is free of all foreign materials such as debris, oil,
equipment and other objects that could affect operation and cause injury to persons.
Avoid using flammable or toxic solvents such as petrol, benzene, ether and alcohol for
cleaning.
Avoid prolonged contact with solvents and inhaling their vapours. Avoid use close to open
flames or sources of heat.
Never use the vacuum cleaner without the filter.

Safety section
MISTRAL 501 WD/802 WD
15
Do not vacuum lit cigarette ends. The filter could be damaged.
Do not vacuum petrol or flammable liquids in general.
Make sure all the guards and protection devices are in place and that all the safety devices
are in place and working properly.
Do not wear loose or hanging clothing such as ties, scarves or torn garments that could
become trapped and be sucked up by the cleaner.
Do not open the vacuum container with the machine running.
The manual should always be kept handy for reference so the operating cycle can be
checked every time there are doubts.
In the event of this manual being lost or damaged, ask DELFIN for a new copy.
Structural damage and improper alterations or repairs could change the protection capacity
of the vacuum cleaner and therefore cancel this certification.
Any alterations to the appliance must only be made by Delfin engineers.
During maintenance jobs, affix a notice to the appliance indicating "MACHINE BEING
SERVICED, DO NOT START".
Climbing on the cleaner is forbidden.
Never touch electric wires, switches, buttons, etc. with wet hands.
Before connecting to the power mains, make sure the power voltage and frequency are
those shown on the machine plate.
Make power connections to a mains supply with efficient earth system.
In the event of an extension being used, make sure this is in perfect condition, marked CE
and that the cross section of the cable is suitable for the vacuum cleaner power input.
When restoring original working conditions, the appointed personnel should make sure that
at the end of the operating procedure, proper vacuum cleaner operation safety conditions
are restored, especially the safety devices and the protective guards.
Only adult persons should use the vacuum cleaner.
During vacuuming operations, always brake the vacuum cleaner using the special revolving
wheel lock.

MISTRAL 501 WD/802 WD
16
2.3 Safety plates and symbols
Plates are affixed to the vacuum cleaner showing safety symbols and/or messages.
Important!
Make sure all the safety messages are legible.
Clean these with a cloth, soap and water. Do not use solvents, diesel fuel or petrol.
Replace the damaged plates with new ones supplied by Delfin.
If a plate is affixed to a replaced part, make sure a new plate is affixed to the new
part.
Important!
Read the operator's and maintenance manual carefully before using the cleaner or
doing any maintenance jobs.

Safety section
MISTRAL 501 WD/802 WD
17
2.4 Outstanding risks
Careful analysis of risks performed by the manufacturer and stored in the technical file has
made it possible to eliminate most of the risks associated with vacuum cleaner operation.
The manufacturer advises carefully following the instructions, procedures and advice
contained in this manual as well as applicable safety regulations, including the use of the
envisaged protection devices, both those integrated in the cleaner and individual.
Outstanding risks associated with the vacuum cleaner could be:
Electrical maintenance risks caused by the need to work under power.
Pursuant to Presidential Decree 547/55, only trained personnel should work on the machine
with the power supply connected and this must have double earth insulation.
Risk of improper use in the presence of explosive and flammable substances.
The vacuum cleaner must not be used in environments containing substances in the form
of liquids that could vaporise at room temperature and flammable dusts and gas.
Risks of operation in humid environments
Keep to the limits shown in this manual at chap. 1.5 Allowed environmental conditions.
Risk of erroneous interpretation of the safety pictograms
Having identified the various outstanding risks, the manufacturer has affixed to the cleaner
a number of hazard labels in compliance with regulations relating to the graphic symbols to
be used.
The user must immediately replace any safety plates that become illegible due to wear or
damage.
Important!
Removing the safety plates on the vacuum cleaner is strictly forbidden.
The manufacturer declines all liability in relation to vacuum cleaner safety in the
event of failure to comply with the above indications.
2.5 Applied directives
The following directives apply to the vacuum cleaner described in this manual:
•2006/42 EEC Machine directive
•2004/108 EEC Electromagnetic compatibility directive
•2006/95 EEC Low-voltage directive