ZIEHL-ABEGG ER25C User manual

RH..C and ER..C
RH..C radial impellers and ER..C plug fans in explosion proof
design in compliance with Directive 2014/34/EU (ATEX).
Directly powered with IEC standard motor for use in
explosive atmospheres, zone 1 (category 2) and zone 2
(category 3).
Assembly instructions
Keep for reference!
VENTILATOR-Typenschild
einkleben!
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
english

Content
1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Scope of documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Structure of the assembly instructions . . . . . . . . . . . . . . . . . . . . 5
1.3 Target group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Exclusion of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Hazards and intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3.1 Special hazards when operating in explosive atmospheres . 8
2.3.2 Improper use / reasonably foreseeable misuse . . . . . . . . . . 9
2.4 Explanations of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.5 Product safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6 Requirements placed on the personnel / due diligence . . . . . . . 11
2.7 Work on the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.8 Modifications / interventions in the device . . . . . . . . . . . . . . . . . 12
2.9 Operator’s obligation of diligence . . . . . . . . . . . . . . . . . . . . . . . . 12
2.10 Employment of external personnel . . . . . . . . . . . . . . . . . . . . . . . 12
3 Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Application / operational area . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.1 Application area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.2 Explosion protection zone . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.3 Equipment class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.4 Temperature class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.5 Fan marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 Name plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 Transport, storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4 Disposal / recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Particularities when mounting explosion protected fans . . . . . . . 16
4.2.1 Installation, protection from external influences . . . . . . . . . . 17
4.2.2 Protect from the penetration of foreign bodies . . . . . . . . . . 17
4.2.3 Protection against contact with rotating and stationary parts . 17
Assembly instructions RH..C and ER..C
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
2/48

4.2.4 Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Assembly of ER..C plug fans . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4 Special instructions on the installation of series fans ER..C . . . . 19
4.5 Mounting RH..C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6 Connection of pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7 Connection lead & terminal box . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.8 Assembly in a humid atmosphere . . . . . . . . . . . . . . . . . . . . . . . 22
5 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.3 Frequency inverter and EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.4 Electrical connection, grounding and protection . . . . . . . . . . . . . 25
5.5 Mains connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.5.1 Line Voltage/Rotat. Direction . . . . . . . . . . . . . . . . . . . . . . 26
5.5.2 Required quality attributes for the mains voltage . . . . . . . . . 26
5.6 Motor protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.1 Prerequisites for commissioning . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2 During start-up check the following . . . . . . . . . . . . . . . . . . . . . . . 27
6.3 ER..C resonant frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7 Trouble shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.1 Code of behaviour in the event of faults . . . . . . . . . . . . . . . . . . . 35
7.2 Possible causes and remedial measures . . . . . . . . . . . . . . . . . . 35
8 Service work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.1 Repairs / maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.2 Particularities when using in explosive atmospheres . . . . . . . . . 38
8.2.1 Bolted connections and ground connections . . . . . . . . . . . 39
8.2.2 Motor and bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.2.3 Impeller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.2.4 Load-bearing parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.2.5 Clearances and gap dimension . . . . . . . . . . . . . . . . . . . . 40
8.2.6 Flexible connections and seals . . . . . . . . . . . . . . . . . . . . . 40
8.3 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9 Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Assembly instructions RH..C and ER..C
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
3/48

9.2 EC Declaration of Incorporation . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.3 EU declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.4 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.5 Manufacturer reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Assembly instructions RH..C and ER..C
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
4/48

1 General notes
Compliance with the following instructions is mandatory to ensure the functionality and
safety of the product. If the following instructions given especially but not limited for
general safety, transport, storage, mounting, operating conditions, start-up, mainte-
nance, repair, cleaning and disposal / recycling are not observed, the product may not
operate safely and may cause a hazard to the life and limb of users and third parties.
Deviations from the following requirements may therefore lead both to the loss of the
statutory material defect liability rights and to the liability of the buyer for the product that
has become unsafe due to the deviation from the specifications.
1.1 Scope of documentation
This document is valid for ER..C and RH..C type centrifugal fans (see rating plate)
suitable for use in an explosive atmosphere.
The complete documentation for the product consists of these fan assembly instructions
and the motor operating instructions.
To ensure the final suitability of the product for the permissible conditions of use
specified in the order acknowledgement, it is absolutely imperative to observe the
fan assembly instructions and the motor operating instructions. In particular, this
applies to safety instructions, storage, transport, assembly and service.
If necessary, you can request the motor operating instructions from the motor manufac-
turer in your desired language.
Information
In the case of fans with the quality mark (see rating plate), please note the related
specifications depending on the application location!
1.2 Structure of the assembly instructions
Before installation and start-up, read this assembly instructions carefully to ensure
correct use!
We emphasize that these assembly instructions apply to specific units only, and are in
no way valid for the complete system!
Use these assembly instructions to work safely with and on the device. They contain
safety instructions that must be complied with as well as information that is required for
failure-free operation of the device.
Keep these assembly instructions together with the device. It must be ensured that all
persons that are to work on the device can refer to the assembly instructions at any time.
Keep the assembly instructions for continued use. They must be passed-on to all
successive owners, users and final customers.
Assembly instructions RH..C and ER..C General notes
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
5/48

1.3 Target group
The assembly instructions address persons entrusted with planning, installation, com-
missioning and maintenance and servicing and who have the corresponding qualifica-
tions and skills for their job.
1.4 Exclusion of liability
Concurrence between the contents of these assembly instructions and the described
hardware and software in the device has been examined. It is still possible that non-
compliances exist; no guarantee is assumed for complete conformity. To allow for future
developments, construction methods and technical data given are subject to alteration.
We do not accept any liability for possible errors or omissions in the information con-
tained in data, illustrations or drawings provided.
ZIEHL-ABEGG SE is not liable for damage due to misuse, improper use or as a
consequence of unauthorized repairs or modifications.
1.5 Copyright
These assembly instructions contain copyright protected information. The assembly
instructions may be neither completely nor partially photocopied, reproduced, translated
or put on data medium without previous explicit consent from ZIEHL-ABEGG SE. In-
fringements are liable for damages. All rights reserved, including those that arise through
patent issue or registration on a utility model.
2 Safety
2.1 Safety instructions
This chapter contains instructions to prevent personal injury and property damage.
These instructions do not lay claim to completeness. In case of questions and problems,
please consult our company technicians.
Attention!
•Non-compliance with the information and safety instructions listed in these assembly
instructions can cause serious health and safety risks!
Be aware of the following Points:
•The fans are intended exclusively for use in zone 1 and 2 explosive atmospheres for
gases (see rating plate).
•The conveyance of solid matter or solids content in the conveying medium is not
permissible and can lead to dangerous situations. ZIEHL-ABEGG rejects any liability
for damage of any kind as a result of such use.
•The temperature classes of fan and motor are allowed to be different, but they must
be defined according to the ignition temperature of conveying media.
•The fans must be operated in the temperature ranges specified on the rating plate.
•The operating data on the rating plate are specified for an air density of 1.2 kg/m
3
.
•Assembly and electrical connection may only be carried out by skilled personnel in
compliance of applicable standards and these assembly instructions.
Assembly instructions RH..C and ER..C Safety
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
6/48

•Start-up and maintenance of the device may only be carried out by skilled personnel,
who have completed ATEX training for correct performance of their work.
•The motor overheating protection equipment must be connected. Improper con-
nection will invalidate the manufacturer's warranty. Furthermore, this might lead to
explosion hazards.
•Protection of the motor against unusual heating in compliance with EN 60204 must be
ensured.
•If the fan is accessible, guard grilles complying with EN 13857 must be installed.
These must not be changed and must be adequately secured.
•Pay attention to objects at a greater height which might fall down.
•Pay special attention to material combinations according to EN 14986.
•Since a residual risk due to falling objects, incorrect behaviour, etc. cannot be
completely ruled out, the designer, operator or manufacturer of the installation or
system in which the fan is to be installed, must prevent any potentially hazardous
situation from arising by means of appropriate safety measures in line with standard
EN ISO 12100 and especially standard EN 14986.
•The operator is responsible for maintenance of the fan.
•Compliance with the EMC Directive only exists if the fan is directly connected to the
main power supply. If the fan is installed in a system or combined with other products,
the system manufacturer is responsible for compliance with the EMC Directive.
Responsibility of users
•The owner or operator must ensure that the equipment (fan and electrical system) is
used according to the description in these instructions and kept in good operating
condition.
•The user shall only put the fan into operation after it has been properly installed.
•The fan must be operated in accordance with the assembly instructions.
•To ensure operability, safety devices (especially the overheating protection equip-
ment) must be checked regularly.
•The instructions for installation and use must be complete and available to users at
any time.
•Users must be trained with regard to the hazards associated with the operation of an
installation in an explosive atmosphere and the intended use of the installation.
•No safety and warning instructions on the fan may be removed, and the user must
make sure that they are legible.
•The persons responsible for the installation, start-up, operation and maintenance of
the device must be competent and possess sufficient experience to correctly perform
their work.
•In addition, they must know the European standards and guidelines (at national and
regional level and if applicable the in-house regulations) for safety and hazard
prevention. A new user may only work under the supervision of an experienced
operator.
•This device must not be used by persons with limited physical and mental abilities.
Moreover, the minimum legal age must be observed, the users must be adequately
trained.
Assembly instructions RH..C and ER..C Safety
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
7/48

2.2 Intended use
Attention!
•The fans are only intended for the conveyance of air or mixtures similar to air.
•Only
fans marked with are permitted for the conveyance of or installation in
explosive atmospheres!
•Any other use above and beyond this is considered not for the intended purpose
unless agreed otherwise by contract. The manufacturer will not be liable for any
damage resulting from this. The individual or company using it bears the sole risk.
•Reading these document and complying with all contained instructions -especially the
safety notifications contained therein -are considered part of intended use.
•The documentation for connected components must also be observed (e.g. frequency
inverters).
•Observe the permissible temperature classes on the rating plate.
•Due to their safe design, ZIEHL-ABEGG ER...C plug fans from Group II, Category 2G,
3G for gas with ignition protection type "h" ("c") are suitable for conveying Group IIA
and IIB explosive atmospheres for Zone 1 and Zone 2.
The following usage limits apply:
–Maximum conveying medium temperature range -20...+40 °C (with suitable motors
also up to +60 °C)
–maximum absolute pressure in the range from 0.8 to 1.1 bar
–maximum part by volume, oxygen 21 %
–maximum installation height 2000 m above mean sea level
In addition, a maximum drive motor ambient temperature of +40 °C must not be
exceeded. In exceptional cases, motors may also be suitable for operation at ambient
temperatures up to 60 °C (see motor rating plate) or installation at altitudes of more than
2000 m above sea level (in some cases with reduced power).
2.3 Hazards and intended use
2.3.1 Special hazards when operating in explosive atmospheres
When operating a fan in an explosive atmosphere and when conveying explosive gases
with the fan, comply especially with the following potential hazards and ignition sources
stated below:
•Contact between rotating parts (impeller) and stationary parts (inlet nozzle) can result
in friction, grinding or impact sparks.
•Development of friction, grinding or impact sparks due to the intake of foreign bodies
or through foreign bodies which fall into the fan.
•Development of sparks caused by the discharging or electrostatically charged compo-
nents. Especially plastic surfaces and surfaces with high layer thickness are a hazard
potential due to dust deposits.
•Hot surfaces, e.g. due to an overload or through frictional heat caused by contact of
rotating parts with stationary parts.
•Strong vibrations (e.g., due to imbalance) which can lead to parts becoming hot (e.g.,
due to a bearing defect) or due to rotating and stationary parts touching each other.
Assembly instructions RH..C and ER..C Safety
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
8/48

•Release of an explosive atmosphere from the inside to the outside or from the outside
to the inside, thus resulting in an explosive atmosphere (zone entrainment).
•The following sections explain additional risks and the required measures to minimise
or avoid them.
2.3.2 Improper use / reasonably foreseeable misuse
•Operation in an environment for which the EPL / device category of the fan is not
suitable.
•Operation in a medium with an impermissible temperature class.
•Conveyance of aggressive, corrosive, abrasive or adhesive media.
•Conveyance of dust and media containing particles.
•Transfer of solids or solids content in the transfer medium.
•Operation in an unintended installation position with vertical motor shaft (plug fan ER
only allowed with horizontal motor shaft, motor feet downwards).
•Operation at unacceptably high speeds. The maximum permitted speed is specified
on the rating plate.
•Operating conditions which are associated with impermissibly strong vibrations or
which lead to exceeding the maximum permissible frequency of vibrations.
•Use with direct contact with foodstuffs or cosmetic and pharmaceutical products.
•Use of the fan as an independent household appliance.
•Use with vibration loading by customer device. Resonant operation and operation
with severe vibrations or oscillation.
•Operation with iced up impellers.
•Conveyance of liquid media.
•Use of the fan and add-on parts (e.g. guard grille) as a resting surface or climbing aid.
•Operation of the fan as a safety component or for the performance of safety-relevant
functions in the sense of EN ISO 13849-1.
•Blocking or braking of the fan by inserting objects.
•Loosening of fan blade, impeller and balancing weight.
•If a fan is operated with a frequency inverter, unacceptably high vibrations can occur
in narrowly limited speed ranges. Constant running is therefore not permitted. The
impeller can burst - danger of serious or even mortal injury!
•Use as fire gas or smoke extraction fan.
•All applications not listed in the intended use.
•Fans and parts of fans must never be changed or altered without authorisation. The
following measures apply, for instance, as non-intended:
–Removing or replacing components or individual parts of the fan with non-identical
parts.
–Absence of loose accessories supplied, which are required to ensure intended use
(e.g. expansion joints, guard grille, vibration damper).
–Drilling holes.
–Welding parts on.
–Modifying the coating (e.g. grinding off, painting over).
Assembly instructions RH..C and ER..C Safety
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
9/48

–Only the following components may be fastened to the fan: Air flow components
(expansion joints for pipes or ductwork), loose accessories supplied, parts for the
drive motor electrical connection. The fan may only be connected to pipes or a
ductwork system using an expansion joint. Only the mounting options specially
intended for the purpose must be used for assembling or connecting these compo-
nents.
–Jobs or conditions which do not comply with the instructions stated in these
operating instructions on storage, installation, transport, connection, maintenance,
service, cleaning and which deviate with the special instructions on explosion
protected fans listed below.
Attention!
Not the manufacturer, rather the operator of the device is liable for any personal harm or
material damage arising from non-intended use.
2.4 Explanations of symbols
Safety instructions are highlighted with warning triangles and are depicted
according to the degree of hazard as follows.
Attention!
General hazardous area. Death or severe injury or significant property damage can
occur if the corresponding precautions are not taken!
Danger due to electric current
Danger by dangerous, electric voltage! Death or severe injury can occur if the
corresponding precautions are not taken!
Information
Important additional information and advice for user.
2.5 Product safety
The device conforms to the state of the art at the time of delivery and is fundamentally
considered to be reliable. The device and its accessories must only be used in a flawless
condition and installed and operated in compliance with the assembly instructions and/or
operating instructions. Operating outside the device's technical specifications (see name
plate and attachment / technical data) can lead to a defect in the device and additional
damage!
Information
A separate fault and performance monitoring-system with an alarm signal function is
necessary in order to prevent personal injuries and material damages during malfunc-
tions and in case the device fails. Substitute operation must be taken into consideration!
Assembly instructions RH..C and ER..C Safety
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
10/48

The design and installation of the system must comply with local regulations and
directives.
2.6 Requirements placed on the personnel / due diligence
Persons entrusted with the planning, installation, commissioning and maintenance and
servicing in connection with the frequency inverter must have the corresponding qual-
ifications and skills for these jobs.
In addition, they must be knowledgeable about the safety regulations, EU/EC directives,
rules for the prevention of accidents and the corresponding national as well as regional
and in-house regulations. Personnel to be trained or instructed and apprentices are only
permitted to work on the device under the supervision of an experienced person. This
also applies to personnel undergoing general training. Comply with the legal minimum
age.
2.7 Work on the device
Information
Mounting, electrical connection, and start-up operation may only be carried out by an
electrical specialist in accordance with electrotechnical regulations (e.g. DIN EN 50110
or DIN EN 60204)!
Only specifically qualified persons are permitted to perform any work on explosion
protected devices (e.g. TRBS 1203, Section 3.1).
Danger due to electric current
•It is generally forbidden to carry out work on electrical live parts. Protection class of the
device when open is IP00! It is possible to touch hazardous voltages directly.
•The safe isolation from the supply must be checked using a two-pole voltage
detector.
•Maintenance work may only be carried out by suitably qualified personnel.
Attention, automatic restart!
•The fan / motor may switch on and off automatically for functional reasons.
•After power failure or mains disconnection an automatic restart of the fan takes place
after voltage return! Therefore the fan must be disconnected from voltage before
doing any work (see service work).
•Wait for the fan to come to a complete standstill before approaching it!
Danger of being sucked in!
Do not wear loose or hanging clothing, jewellery, etc., tie together long hair and cover it.
Assembly instructions RH..C and ER..C Safety
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
11/48

2.8 Modifications / interventions in the device
Attention!
For reasons of safety, no unauthorized interventions or modifications may be made on
the device. All planned modifications must be authorized by the manufacturer in writing.
Use only genuine spare parts / genuine wearing parts / genuine accessories from
ZIEHL-ABEGG.These parts were specifically designed for the device. There is no
guarantee that parts from non-original sources are designed and manufactured in
correspondence with load and safety requirements.
Parts and optional equipment not supplied by ZIEHL-ABEGG are not approved by
ZIEHL-ABEGG for use.
2.9 Operator’s obligation of diligence
•The contractor or owner must also ensure that the electric systems and equipment
are operated and maintained in accordance with electro-technical regulations.
•The owner is obliged to ensure that the device is operated in perfect working order
only.
•The device may only be used as intended.
•You must periodically examine the safety equipment for their properly functioning
condition.
•The assembly instructions and/or operating instructions are always readily available
at the location where the device is being used, are complete and are in legible
condition.
•These persons are regularly instructed in all applicable questions regarding occupa-
tional safety and environmental protection and are knowledgeable regarding the
assembly instructions and/or operating instructions and, especially, are familiar with
the safety instructions contained therein.
•All safety and warning notices attached to the device are never removed and remain
legible.
2.10 Employment of external personnel
Maintenance and service work are frequently carried out by external employees who
often do not recognize the specific situations and the thus resulting dangers.These
persons must be comprehensively informed about the hazards in their area of activity.
It is the site manager's task to obtain information about potential hazards related to the
ATEX Zone and to ensure that personnel are adequately trained in the tasks to be
performed.
You must monitor their working methods in order to intervene in good time if necessary.
Assembly instructions RH..C and ER..C Safety
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
12/48

3 Product overview
3.1 Application / operational area
The free running radial impellers from the RH..C series, available in frame sizes 250 to
1000, and the ER..C series (see rating plate for type designation) in explosion proof
design
II 2G Ex h IIB T4 Gb with IEC standard motor in ignition protection class
Ex d IIC/IIB T4 Gb, Ex de IIC/IIB T4 Gb, Ex db IIC/IIB T4 Gb and Ex db eb IIC/IIB T4
Gb are not ready to use products, but are designed as components for air conditioning,
ventilation and venting systems.
Operation is only permitted if they are installed as intended and safety is ensured
through the use of protective devices complying with DIN EN ISO 13857 / EN 60529 and
the constructional explosion protection measures set out in EN 14986.
Fans are rated for S1 continuous operation.
3.1.1 Application area
The fans satisfy the requirements for equipment group II in compliance with Directive
2014/34/EU and therefore are not suitable for equipment group I applications (under-
ground or mining, cooling/ventilation of rotating electrical machinery and combustion
engines) and may not be used in these areas. The equipment group is specified on the
rating plate of the relevant fan.
3.1.2 Explosion protection zone
The ER..C plug fans with RH..C impellers are only intended to convey air or zone 1
category 2G (EPL Gb) and zone 2 category 3G (EPL Gc) explosive atmospheres.
Conveyance of solids, solid parts or dust/air mixtures is not permitted.
3.1.3 Equipment class
Category 2G and 3G fans are only suitable for use in or for conveying explosion group
IIA and IIB explosive atmospheres in compliance with EN 60079-20. Therefore, the fans
may never be used in or operated with other group IIC explosive atmospheres.
The gas explosion group is specified on the rating plate of the relevant fan.
3.1.4 Temperature class
The ER..C category 2G and 3G plug fans may not be operated in the vicinity of or with
ignitable or explosive gases whose ignition temperature is lower than the maximum
surface temperature of the relevant fan.
The maximum surface temperature is determined by the temperature class (T4) speci-
fied on the rating plate. The system manufacturer or operator must ensure that the
maximum permitted surface temperature and the temperatures of attached devices do
not exceed the T4 temperature class of the fan and that the ambient air is not above
60 % of the maximum permitted ignition temperature due to the volume flow rate around
the motor. The motors used are in temperature class T4, which means that the maximum
surface temperature of the motors cannot exceed T4 - 5 K 130 °C. The motors are the
warmest heat source in normal operation and are equipped with a PTC thermistor, which
trips at 100 °C (T4).
Assembly instructions RH..C and ER..C Product overview
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
13/48

According to EN ISO 80079-36 the following correlation exists between the temperature
class and the maximum surface temperature:
Temperature class Max. surface temperature
T1 450 °C
T2 300 °C
T3 200 °C
T4 135 °C
T5 100 °C
T6 85 °C
3.1.5 Fan marking
Example for marking of an ER..C plug fan:
II 2G Ex h IIB T4 Gb
A fan marked in this manner would meet the following requirements.
: General ATEX marking
•II: Group II requirements compliant with Directive 2014/34/EU (not suitable for under-
ground applications)
•2G: Category 2, gas explosion protection outdoors
•h: General marking (previously “c” for constructional safety)
•IIB: Gas explosion group
•T4: Temperature class
•Gb: Equipment protection level (EPL)
The local process parameters should be compared with the specifications for intended
use and the data on the rating plate.
Other uses which do not coincide with, or which exceed those specified will be deemed
unauthorised unless contractually agreed. Damages resulting from such unauthorised
uses will not be the liability of the manufacturer. The user will assume sole liability.
3.2 Name plate
Example: Fan-rating plate
Information
A fan rating plate is located on the product and an identical fan rating plate is stuck onto
the title page of the enclosed assembly instructions during production.
Assembly instructions RH..C and ER..C Product overview
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
14/48

3.3 Transport, storage
Attention!
•Wear safety clothing / shoes and cut-resistant safety gloves when handling.
•Avoid shocks and impacts to the device during the transport.
•Avoid extreme humidity, heat or exposure to cold (see technical data).
•Improper storage can result in preliminary damage to the motor, which may lead to
premature failure. Only after correct installation do the motors comply with the
specified degree of protection.
•Watch out for possible damage to the packaging or fan.
•Fix pallets during transport.
•Do not stack pallets.
•Transport the fan(s) either in the original packaging or, in the case of larger fans, on
the dedicated transportation fixtures.
•Depending on the type: Lifting eyes, bore holes in the housing flange, motor bed,
fastening brackets and support plates, bore holes in the motor housing for screwing in
eye bolts.
•Observe the weight specifications (see rating plate) and the permissible carrying
loads of the means of transport.
•Only handle with suitable hoisting gear.
•RH..C construction without motor: Fit a sling with sufficient carrying load around a
blade. Observe the weight specified on the rating plate (rear of impeller base plate).
Use only a sling suitable for carrying sharp-edged loads.
•ER..CdesignER..C: Fan unit may only be lifted and transported using a suitable
hoisting device (load spreader). Ensure there is sufficient cable or chain length.
•Position the lifting beam transversely to the motor axis. Ensure that the lifting beam
has a sufficient width. The chain or cable may not touch the fan wheel when lifting.
•Never stand underneath the suspended fan because defective transport equipment
could cause death.
•Store the fan / motor in the original packaging in a dry area protected from the weather
and protect it from dirt and weather until final installation.
•Avoid prolonged storage; we recommend a maximum of one year (consult the
manufacturer before starting if stored for longer).
•Inspect the bearing for proper operation prior to installation.
–Recommendation: Turn the impeller evenly by hand to avoid jamming and damag-
ing the bearing.
•The fan may not be exposed to vibrations or impacts during standstill to avoid roller
bearing damages.
•Observe the motor operating instructions supplied.
3.4 Disposal / recycling
Disposal must be carried out professionally and in an environmentally friendly way in
accordance with the respective national legal stipulations.
"Separate the materials by type and in an environmentally friendly way.
"If necessary, commission a specialist company with the waste disposal.
Assembly instructions RH..C and ER..C Product overview
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
15/48

4 Mounting
4.1 General notes
Attention!
•Check the fan for damage, e.g. cracks, dents or damage to the electric cables, before
assembly. Start-up is not allowed in the case of transport damage!
•Mounting is only to be undertaken by trained service personnel. The system
manufacturer or the machine builder and/or the user is responsible that the inherent
installation and security information are harmonized with the valid standard and
guidelines (EN ISO12100 / 13857).
•Wear safety clothing / shoes and cut-resistant safety gloves when handling.
•If necessary, lift the fan out of the packing with a hoisting unit.
•At a weight greater than 25 kg for men / 10 kg for women, the fan should be lifted out
by two persons (according to REFA). The values may differ from country to country.
•Prior to installing the fan, it is to be checked whether the safety zone as per EN ISO
13857 and in household appliances as per EN 60335 are met. If the installation height
(danger zone) above the reference level is greater than or equal to 2700 mm and is
not reduced by auxiliary means such as chairs, ladders, work platforms or bases on
vehicles, a guard grille against accidental contact is not necessary at the fan.
•If the fan is located in danger zone, then the manufacturer or operator shall ensure
that hazards shall be prevented by appropriare protective constuctions which meet
the requirements to EN ISO 13857.
•Protective measures against falling parts must be taken when installing external rotor
motors with suspended rotors.
•The custom designs must suit the prevailing conditions.
•Tighten the fastenings with the specified torques.
•Do not allow drilling chips, screws and other foreign bodies to reach the device
interior!
•Any use in ambient temperatures below -10 °C is dependent on not being subjected to
unusual, sudden or mechanical loads or stresses on the material (for the min.
permissible ambient temperature please see the technical data).
•Before the first switch-on, remove any items that may be present (borings, screws and
other foreign objects) from the intake area - risk of injury from any objects that may fly
out!
4.2 Particularities when mounting explosion protected fans
In terms of material selection, due to special protective measures relating to possible
contact surfaces between rotating and stationary components (impeller / inlet nozzle),
ZIEHL-ABEGG ER..C plug fans satisfy the requirements of the EN 14986 standard.
Steel plate (coated) is used as the material for the rotating component (impeller). If the
impeller is purchased without a ZIEHL-ABEGG inlet nozzle, the system manufacturer is
responsible for selecting the material for the stationary peripheral parts. Only material
pairs complying with EN 14986 may be used.
Assembly instructions RH..C and ER..C Mounting
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
16/48

4.2.1 Installation, protection from external influences
Install the fan in a housing or in the system with no distortion or tension and protect it
against the effects of external forces and vibrations (e.g. transfer of vibrations from other
system components through the foundations or through the connected pipes and duct-
work).
The fan should be mounted on suitable vibration dampers. These are available as
accessories from ZIEHL-ABEGG. Pipes and ductwork may only be connected via elastic
connections (expansion joints), which are available as accessories. When purchasing
expansion joints that are not supplied by ZIEHL-ABEGG, the system manufacturer must
ensure that they comply with Directive 2014/34/EU or that they have corresponding type
examination certificates. This exempts ZIEHL-ABEGG from any liability in the event of
damage.
Certain operating points/speeds may not be used if resonances occur due to add-on
parts. The system manufacturer must carry out a check for resonances during commis-
sioning (see Start-up chapter).
The fan should be installed in such a way that easy inspection and cleaning are possible
(good accessibility of inspection hatches).
Up and downstream components or those that lie directly in the airflow must not have
any unprotected aluminum or steel surfaces. A surface protection that at least fulfills the
crosscut test parameter of 2 / DIN EN ISO 2409 is necessary to prevent an aluminother-
mic reaction.
4.2.2 Protect from the penetration of foreign bodies
Fans that take in air from or blow out air to the outside must be protected against ingress
of foreign bodies by a guard grille.
Only the guard grilles supplied are to be used as their strength and protection class have
been specially tested.
Guard grilles must also be installed if intake or falling in of foreign bodies cannot be ruled
out despite pipes and ductwork being connected.
At least protection class IP20 in compliance with EN 60529 must be guaranteed for the
entire system at all times.
4.2.3 Protection against contact with rotating and stationary parts
The gap dimension between the inlet nozzle and impeller are factory preset and
checked. However, transportation and assembly work can cause deformation of the fan
(e.g. due to external forces or warping), which can result in the inlet nozzle or the
pressure tapping nipple no longer being correctly aligned with the impeller. Therefore, it
is essential that the gap dimension is checked before commissioning.
It must be ensured that the inlet nozzle is aligned with the impeller in such a way that the
required minimum gap dimension between the impeller and the inlet nozzle or pressure
tapping nipple is maintained over the entire circumference even when the impeller
rotates.
The minimum gap width between rotating components, e.g. the impeller, and non-
moving components, e.g. the inlet nozzle or pressure tapping nipple, must be at least
0.5 % of the relevant contact diameter (diameter of the rotating part at the point where it
could come into contact with the stationary part). However, it may not be less than 2 mm
in the axial or radial direction and does not need to be greater than 13 mm. At these
points, suitable material pairs must be used in compliance with DIN EN 14986.
Assembly instructions RH..C and ER..C Mounting
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
17/48

Attention!
Always applicable: if the required minimum gap dimension is not maintained in fans, they
must never be put into operation under any circumstances!
The following minimum gap dimensions between the impeller and the
inlet nozzle must be maintained, depending on the relevant contact diam-
eter
Series/-
Frame size
Relevant impeller contact diameter Required minimum gap 0.5 % of con-
tact diameter and minimum 2 mm
DE in mm S in mm
ER/RH25C 163.1 2
ER/RH28C 181.2 2
ER/RH31C 203 2
ER/RH35C 228.4 2
ER/RH40C 257.4 2
ER/RH45C 290.1 2
ER/RH50C 326.2 2
ER/RH56C 362.5 2
ER/RH63C 406.1 2
ER/RH71C 456.8 2,3
ER/RH80C 514.9 2,6
ER/RH90C 580.2 2,9
ER/RH10C 625.5 3,3
The possible contact diameter corresponds to the internal diameter at the suction mouth of the
impeller, which is specified on ZIEHL-ABEGG SE dimension sheets as “DE”.
Assembly instructions RH..C and ER..C Mounting
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
18/48

Attention!
Always check the gap dimension with a feeler gauge before start-up. Safe operation is
only guaranteed if it is compliant.
4.2.4 Sealing
ER..C plug fans and RH..C impellers are not ready to use products, but are designed as
components with no housing for air conditioning, ventilation and venting systems. The
system manufacturer or operator is responsible for the sealing of the system.
4.3 Assembly of ER..C plug fans
Installation, electrical connection and commissioning are only to be performed by trained
service personnel.
•The system manufacturer or the machine builder is responsible that the inherent
installation and security information are harmonized with the valid standard and
guidelines (DIN EN ISO 12100 / 13857).
•The following is applicable to all types of centrifugal fans:
–Avoid structural damage or stress with installation. Make sure the surface is flat
and even.
–Do not apply force (levering, bending).
–Fasten using suitable fastening materials
–Secure screwed connections (e.g. using contact washers due to continuity of the
protective conductor system).
–Electrical connection according to the circuit diagram in the terminal box.
–Connect electrically conductive parts grounded.
–Connect the temperature monitor to the tripping device and/or motor cut-out
switch.
•Observe the safety information!
•Structure-borne noise decoupling of the complete plug fan is required to prevent
transfer of disturbing vibrations. Damping elements are not included in the standard
scope of supply.
Caution: All contact points must be fixed securely to the base. If the fixing is
inadequate there is a risk of the fan overturning.
•Ensure adequate clearance on the suction and pressure sides (see installation
instructions).
•Erect in the open air only if this is expressly mentioned and confirmed in the ordering
information. There is a risk of damage to the bearings if the fan remains stopped in a
moist environment. Avoid corrosion by suitable protective measures. Roofing is
required.
•Modifications/conversions to the fan undertaken by the operator are not permissible -
safety hazard.
4.4 Special instructions on the installation of series fans ER..C
ZIEHL-ABEGG ER..C series plug fans are generally installed in customer air condition-
ing and ventilation systems and can only be classed as complete and functioning fans
when installed correctly in the customer systems.
Assembly instructions RH..C and ER..C Mounting
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
19/48

Within the scope of supply and the agreed supply limits, these fans comply with the
relevant explosion protection directives and standards. Failure to comply with the
assembly instructions or negligent installation and inadequate testing when installing
these fans in air conditioning and ventilation systems can result in significant hazards.
Since in this series ZIEHL-ABEGG SE does not have any influence itself over the
installation conditions of the supplied fan, the customer or system manufacturer is
responsible for complying with all necessary explosion-protection relevant directives
(2014/34/EU and if applicable DIN EN 14986, DIN EN ISO 80079-36, DIN EN ISO
80079-37, among others)!
When mounting/installing these fans, comply with all other instructions in these operating
instructions, especially also including the following criteria:
•The required minimum gap dimension of the surrounding (housing) parts to the
rotating fan parts must be complied with! Especially in fans delivered with loose
enclosed inlet jets, comply with the maintenance of the minimum gap dimension: the
edge of the inlet jet dips into the intake port of the impeller during assembly/mounting.
For that reason, this is the critical point at which it is mandatory to check the
maintenance of the minimum gap dimension! Make sure that the inlet jet is aligned to
the impeller in such a manner that also during the rotation of the impeller, the required
minimum gap dimension between the impeller and the inlet jet is maintained through-
out the entire circumference!
•On fans supplied with an attached inlet nozzle (inlet nozzle in nozzle plate), the gap
dimension to the impeller is factory preset. However, transportation and assembly
work can cause the nozzle plate to move, resulting in movement of the inlet nozzle
relative to the impeller (e.g. due to external forces or warping). Therefore, it is also
essential to check the gap dimension before commissioning on this version.
•Surrounding housing or system parts must also maintain the required minimum
clearance to the rotating fan parts!
•The minimum gap width between rotating components, e.g. the impeller, and non-
moving components, e.g. the inlet nozzle, must be at least 0.5 % of the relevant
contact diameter (diameter of the rotating part at the point where it could come into
contact with the stationary part). However, it may not be less than 2 mm in the axial or
radial direction and does not need to be greater than 13 mm if suitable material pairs
are used.
•Always applicable: if the required minimum gap dimension is not maintained in fans,
they must never be put into operation under any circumstances!
•Comply with the permissible material combinations of rotating and stationary housing)
parts according to DIN EN 14986.
•For simplified maintenance and cleaning of the fan, the surrounding housing and
system parts must be provided with inspection ports, doors, or –hatches!
•To keep the possible overflow of explosive atmosphere from inside to outside to a
minimum, the housing, the inspection hatches or doors and the suction and pressure
side air duct connections must be suitably sealed. The system manufacturer is
responsible for sealing of the housing and the system.
•Impact resistance in compliance with DIN EN ISO 80079-36 must be ensured.
•Protection against ingress of foreign bodies (IP20) must be ensured.
•Protection against electrostatic charge must be ensured.
Assembly instructions RH..C and ER..C Mounting
L-BAL-F019-GB 2021/12 Index 003 Part.-No. 00282064-GB
20/48