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Mounting and operating instructions
High-performance axial fans for
use in areas subject to explosion
hazards
Axial fans for
areas subject to explosion hazards
Congratulations on having purchased a new MAICO
fan. The unit is manufactured in accordance with the
ATEX Directive 2014/34/EU and is suitable for areas
subject to explosion hazards.
Before mounting and using the fan for the first
time, read these instructions carefully and follow
the information they contain.
The warnings provided indicate hazard situations
which result/could result in death or serious injury
(DANGER / WARNING) or minor injury (CAUTION)
if not avoided. NOTICE indicates potential damage
to the product or its surroundings. Keep the instruc-
tions safe for use later on. The title page contains
a duplicate of the rating plate for your unit.
1 Figures
Title page with QR code for accessing the
i
website directly by smartphone app.
Fig. A, B and C
DZQ .. Ex e/t wall-mounted fan, square wall plate
DZS .. Ex e/t wall-mounted fan with wall ring
DZD .. Ex e/t roof fan
DZR .. Ex e/t duct fan
SG
Protective grille
X
Flange hole (4...16 holes, depending on type)
Fig. A1: Air gap check with air gap gauge
Fig. D: Air flow direction/rotational direction Chap. 16
Fig. E: Wiring diagram
2 Scope of delivery
Fan, connecting cable, explosion protection terminal
box with cable screw connection, air gap gauge
(for DZQ ../DZS ..), these mounting and operating
instructions. For fan serial no. Rating plate on title
page or fan. EU declaration of conformity at the end
.
of these instructions
3 Qualification of installation, cleaning and
maintenance staff
Mounting, commissioning, cleaning and maintenan-
ce may only be undertaken by electricians trained
and authorised in explosion protection accor-
ding to Directive 1999/92/EC Annex II 2.8.
These are qualified persons in accordance with
the directive mentioned above who are trained as
electricians as well. Additional national legal require-
ments must be considered.
4 Intended use
The fan is used for air extraction or ventilation of
rooms used for commercial purposes (production
facilities, commercial premises, garages etc.) with
potentially, explosive atmospheres in accordance
with 1999/92/EC, Article 2, (4), (5).
The fan fulfils the safety requirements of Directive
2014/34/EU for units and protective systems in
areas subject to explosion hazards.
The unit is classified as group II, category 2G for ga-
seous atmospheres and 2D for dust atmospheres,
satisfies type of protection „e"/"c" or „t"/"c" and is
suitable for use in zone 1 and 2 or 21 und 22 areas
subject to explosion hazards. The exact applicability
can be found on the type plate.
For outdoor use, the fan must be protected from
exposure to the elements.
6
5 Non-intended use
The fan unit must not be used in the following
situations under any circumstances. There is a
risk of death. Read all the safety instructions.
EXPLOSION HAZARD
EX
Explosion hazard due to ignition of ex-
!
plosive substances if operating with no PTC
thermistor triggering device or an unauthor-
ised device. Only operate fan with an extra PTC
thermistor triggering device in accordance with
Directive 2014/34/EU ( Chap. 6).
Explosion hazardfrom operating several
!
fans in parallel with one single PTC thermis-
tor triggering device. Reliable tripping is not
always guaranteed in the event of a fault. Do not
under any circumstances operate several fans in
parallel with one single PTC thermistor triggering
device.
Explosion hazard due to spark formation
!
by the impeller scraping on the housing if the
air gap is too small. Ensure a large enough air
gap all the way round between the impeller and
housing.
Explosion hazard when moving explosive
!
liquid particles (e.g. dye), which may stick to
the fan. Do not under any circumstances use fan
to move explosive liquid particles.
Explosion hazard during operation with
!
abrasive media. Abrasive media must be avoided.
Explosion hazard when operating outside
!
the ambient and operating conditions, especi-
ally due to overheating when operatingoutside
the permitted usage temperature. Only operate
fan within the permitted ambient and operating con-
ditions and permitted usage temperature.
!
Explosion hazard when operating without
protective device should foreign bodies fall or be
drawn into the air channel Risk of death due to
spark formation. Be sure to fit a protective device
according to EN 60529, e.g. MAICO protective
grille SG... on an uncovered air inlet/outlet. (IP 20
degree of protection). Protection against reaching
in (protective grille in accordance with EN 13857) is
required on both sides.
Explosion hazard if the explosive atmos-
!
phere cannot be removed if the supply air in-
take is insufficient. This can arise if e.g. rooms
are too air-tight or room filters are clogged.
Ensure sufficient supply air intake. Operate fan in
permissible air power range.
Explosion hazard when operating with
!
frequency converter for speed control. Bearing
currents may be a direct source of ignition.
Operation with frequency converter not permitted.
Explosion hazard due to unauthorised
!
conversions on unit, incorrect mounting or
damaged components. Danger if installation/
modification work is carried out by unqualified
staff. Operation not permitted if unit is modified,
mounting is incorrect or components are damaged.
Unit is not approved if mounting work is carried out
by unqualified staff.
Danger of explosion when operating with
!
dust layers on the motor. To avoid overheating
regular inspection and cleaning is imperative.
CAUTION
!
Danger of injury if there is no protection
against reaching in/contact (protective grille)
on uncovered air inlet/outlet, especially if peo-
ple can access the fan. Fan may only be operated
with protection against reaching in on both
sides. Areas with potential access to rotating parts
(impeller) should be made safe with protection
against reaching in in accordance with EN ISO
13857, e.g. MAICO protective grille SG.. (satisfies
IP 20 degree of protection in accordance with
EN 60529).
6 PTC thermistor triggering device needed
PTC thermistor triggering devices which meet the
following conditions are permitted, otherwise the
conformity ceases to apply:
● Type-examination in accordance with Directive
2014/34/EU.
● Identification in accordance with Directive at least
II (2) G for use in gas atmospheres or II (2) D for
use in dust atmospheres.
The PTC thermistor triggering device must be matched
to the PTC thermistor inserted in the winding in
accordance with DIN 44082 ( see rating plate).
Tripping must occur:
● in the time stated on the rating plate t
● in the event of excess temperatures on the PTC
thermistors, i.e. in the stator winding of the con-
nected motor.
● after a short-circuit in the PTC thermistor circuit.
● after a wire break in the PTC thermistor circuit.
● after the supply voltage fails in all three external
conductors.
Once all causes of faults have been eliminated, the
connected motor must not start up again automat-
ically. It may only be switched on again manually
(switch-on inhibit).
For optimum protection, we recommend the MAICO
MVS 6 PTC thermistor triggering device type ex-
amined in accordance with Directive 2014/34/EU –
please note the MVS 6 operating instructions.
7 Duties of the installer and the operating
company
The fan may only be operated at permissible ambi-
ent and airstream temperatures of -20 to +40 °C and
only if fully mounted.
The fan must be regularly inspected and maintained
by a qualified person as described in chapter 3 of
this manual Chapter 19.
Cleaning and maintenance intervals should be
determined by the operator in accordance with
EN 60079-17 – frequency depends on ambient
conditions and anticipated limitations. Shorten
the maintenance intervals in the event of dust or
a corrosive atmosphere. Additional safety require-
ments should be observed during mounting and
operation, e.g. in accordance with
● EC Directive 1999/92/EC, ATEX 137: implement-
ed in Germany with the Ordinance on Industrial
Safety and Health.
● EN 60079-14: Design, selection and erection of
electrical installations.
● the national accident prevention requirements.
8 Safety instructions for users
DANGER
!
Explosion hazard due to spark formation if
foreign bodies are inserted into the unit. Do not
insert any objects in the unit.
CAUTION
!
Danger of injury due to rotating impeller and
suction. Hair, clothing, jewellery etc. may be
pulled into the fan if you get too close to it.
During operation always keep far enough away to
prevent this from happening.
.
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