EXHeat HEF 30 Manual

Installation, Operation & Maintenance
Instructions Manual
HEF Increased Safety
Anti-Condensation Heater

Page 2
Contents
1. Contact Details.....................................................................................................3
2. Description of Equipment....................................................................................4
3. Markings ...............................................................................................................5
4. Preservation and Storage Instructions ..............................................................6
5. Pre-installation Instructions................................................................................7
6. Installation Instructions.......................................................................................8
7. Special Conditions of Use.................................................................................11
8. Operating Instructions.......................................................................................12
9. Maintenance Instructions..................................................................................14
10. Fault Finding, Correction and Spares ............................................................16
11. COSHH Statement............................................................................................17
12. General Arrangement Drawings......................................................................18
13. Wiring Diagrams...............................................................................................21
14. Routine Maintenance Inspection Records.....................................................22
15. Certification ......................................................................................................24
EXHEAT Industrial can provide versions of this manual in German, French, Italian,
Spanish, Portuguese, Polish, Chinese and Russian. These versions can be requested
at [e-mail]
To maintain the equipment warranty and, if applicable, the Hazardous Area
Certification, the instructions contained within this manual must be complied with in
full.
Fitting any other device invalidates the hazardous area certification.

1. Contact Details
Page 3
1. Contact Details
Sales Enquiries
EXHEAT Industrial Ltd
Threxton House
Threxton Road Industrial Estate
Watton, Thetford
Norfolk, IP25 6NG
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Website: exheat-industrial.com
Technical Support
EXHEAT Industrial Ltd
Threxton House
Threxton Road Industrial Estate
Watton, Thetford
Norfolk, IP25 6NG
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Website: exheat-industrial.com

2. Description of Equipment
Page 4
2. Description of Equipment
The EXHEAT Industrial Ltd HEF type increased safety anti-condensation heater is designed
for anti-condensation or frost protection within control panels, cabinets and small enclosures
in conjunction with a hazardous area thermostat or, on its own as a self-regulating heater.
Enclosure
•Formed 316 perforated stainless steel.
Connections
•The connection of this heater is made via the supplied 3-core up to 1.5mm² supply
cable (16AWG). The standard cable is 1.0mtr long (longer available at request) and
it is the responsibility of the installer/end user to connect to suitable connectors/joint.
Refer to Section 7.
•The internal earth connection is made via the supply cable (internal earth strapped to
the enclosure within the heater) the heater internals are sealed and non-accessible.
The external earth derives from the fixing points either on a DIN rail or onto metallic
base.
Controls
•The nature of the self-regulating cable within the HEF affords it to be a stabilised
design type of heater, therefore there are no additional controls required.
•Should overall control of the temperature be required an EXHEAT Industrial Ltd
certified thermostat may be used, such as the AFT, HFT (standalone thermostats) or
the FXT range can be used for in-line variation.
Mounting
•Up to 4 off 6.2mm (Clearance) diameter mounting holes are provided with pressed
feet.This product may be mounted in any orientation, please refer to the general
arrangement drawing for dimensions of the fixing holes. Alternatively, there are
central holes for DIN rail mounting (4.5mm).
Voltage
•The HEF range can be either 120V nominal or 230V nominal with a range between
110V to 277V, 50 or 60 Hz. Subject to Sales Approval.
CAUTION – Check that the voltage and current of the heater is compatible with the
ratings of the supply or in line thermostat before energising.

3. Markings
Page 5
3. Markings
ATEX Markings: IECEx Markings:
Cert No. ITS19ATEX104973X Cert No. IECEx ITS 19.0024X
II 2 G
Ex eb IIC T4…T3 Gb Ex eb IIC T4…T3 Gb
**’db eb’ when ‘d’ type in-line thermostat is used, ‘eb mb when ‘m’ type in-line thermostat is
used – See relevant thermostat IOM/Certs, markings and standards applied**
Certified to (Heater): Certified to (Heater):
EN 60079-0:2018 IEC 60079-0:2018 Ed 7
EN 60079-1:2014 IEC 60079-1:2014-06 Ed 7
Operating Ambient Temperature
-55°C ≤ Tamb ≤ +80°C when QTVR cable is used
-55°C ≤ Tamb ≤ +80°C when HTSX cable is used
-50°C ≤ Tamb ≤ +80°C when either cable is used with an in-line thermostat (d or m type).
CEC & NEC Markings:
Cert No. 70117806 for division label and CSA17.70117806U for zone label
(CAN-CEC / US-NEC)
Class I Division 2. Groups A, B, C & D. T4…T3
US (NEC): CAN (CEC):
Class I Zone 1 AEx e IIC T4…T3 Gb Ex e IIC T4…T3 Gb
Operating Ambient Temperature
-55°C ≤ Tamb ≤ +80°C
CSA Classes C2848-01, C2848-81
***Optional in-line thermostats may be connected with the HEF (Known as HEF-T), please
refer to the relevant thermostat IOM for the thermostat details***

4. Preservation and Storage Instructions
Page 6
4. Preservation and Storage Instructions
Storage
•Store the equipment in an inside location that is dry, clean and well ventilated.
CAUTION – The following preservation instructions must be adhered to, failure
to do so could result in the equipment warranty being invalidated:
•Store the equipment at between the temperatures as indicated on the
nameplates.
•Ensure that the equipment is not subjected to direct sunlight at ambient
temperatures above +30°C.
•Do not store the equipment for more than 3 months unless packed for long term
storage.
•Protect the equipment against external sources of vibration and/or impact.
•If practically possible, leave the equipment in its original sealed packaging until
required for installation.

5. Pre-installation Instructions
Page 7
5. Pre-installation Instructions
Pre-Installation Inspection
•Each heater (and heater with in-line thermostat) is manufactured to the highest
standard with great care and quality materials. All the goods are thoroughly
inspected and tested before leaving the manufacturing plant, and they must be
handled with care during storage and installation. Before the installation starts it is
advised that the heater is checked to ensure the insulation resistance reading is
above 2MΩ per element at no less than 500 volts dc.
•Should the Anti-Condensation heater fail this test contact the technical help on our
website: www.exheat-industrial.com/contact/support
•Inspect the heater for visible signs of damage, paying particular attention to the
supply cable, as this may get damaged during transport, also ensure that the heater
is not bent or squashed and that the fixing holes are free from obstruction.
Compliance with these instructions is a warranty requirement. Documented evidence must
be maintained in the form of a signed checklist. Copies of completed checklists and records
will be required in the event of any warranty claim.
Insulation Resistance
•The Insulation Resistance Test should be applied between the phase(s) and earth. A
reading of greater than 2MΩ at no less than 500 volts dc should be recorded.
•If the HEF heater has an in-line thermostat connected, the thermostat must be closed
for this test to be undertaken.

6. Installation Instructions
Page 8
6. Installation Instructions
Should deviation from original design parameters occur, or change of
original design structure be required, please refer back to EXHEAT I
ndustrial
Ltd for consultation prior to installation.
•Refer to the relevant code of practice for the equipment:
•IEC/EN 60079-14 for selection and installation or the relevant global equivalent.
•IEC/EN 60079-17 for inspection and maintenance of electric apparatus for use in
potentially explosive atmospheres or the relevant global equivalent.
•Carefully remove the packaging from each product and check for damage.
Immediately report any damage to EXHEAT Industrial Ltd. (please keep this IOM and
the additional certification booklet for future reference).
•Ensure that the product is correctly installed in a suitable location by authorised and
competent persons.
•The HEF heater should be securely fixed in position using the pre-drilled fixing holes,
or the Din rail brackets, adhering to the correct orientation if applicable, and all client
made terminal connections checked for tightness before energising. (The HEF type
unit (including the in-line d or m version) is a sealed heater and must not be opened)
•Before operating the equipment, have the installation approved by the site authorised
person who is responsible to ensure that the installed system is safe for operation.
•Ensure compliance with any instructions and information provided in this manual and
on the drawings/certification supplied, also be aware of any additional warning that
may be present on the product on any warning labels.
•The installer and the end user shall ensure that the unit has free and unrestricted air
flow to allow natural convection to occur at all times. DO NOT COVER the Anti-
Condensation heater and do not allow anything to rest on or against it. Please allow
a minimum 50 – 100mm free air in front of the heater when installed.
•The product shall only be energised within its allowed ambient parameters, please
check the sales literature and certification for the product ambient temperature range.
•Before energising the product, ensure that the supply conforms to the specified
voltage on the products nameplate at a nominal variance of +/- 5% of the specified
voltage.
It is the client’s responsibility to ensure that safe systems of work are used
by all personnel operating and maintaining the equipment, including testing
when ‘live’.
If there is any uncertainty about these points, contact EXHEAT Industrial Ltd
for advice.
Failure to comply could result in the Hazardous Area Certificate being
invalidated.

6. Installation Instructions
Page 9
Electrical Supply Connection
•Refer to wiring diagrams in Section 13.
•There are no cable entries on the HEF Anti-Condensation heater. Connection is
to be made via the manufacturer installed 3 core supply cable.
•Connections to this heater are to be made via the 3-core flex. The flex is to be
installed into suitable rated terminals/joint box, crimped and terminated correctly.
•Refer to Section 7.
•Before connection ensure that the supply corresponds with that specified on the
nameplate label, and that the sizes and types of cables to be used are suitably rated
for the load and temperature of the product.
•Each heater circuit must be protected by a suitably rated over current device and
earth leakage circuit breaker device. See below for earth connection details.
•The HEF heater is not designed to be taken apart and inspected as all of the internal
connections are sealed.
•CAUTION – Check nameplate for correct voltage and classification.
Earth Connection
WARNING – These heaters MUST BE EARTHED.
•The internal earth connection on the HEF range is obtained by the connection of the
3-core supply cable. The external earth connection is to be made via one of the
heaters fixing methods. No additional earth connections are required.
•Should a thermostat be used, please refer to the thermostats IOM for earth
connection points.
Earth-fault Protection
For safety reasons, it is essential to limit the magnitude and duration of earth-fault currents.
It is impractical to cover all possible systems, however note that, regardless of which system
is used, the heater must be protected by a suitable device wired to shut down the heater in
the event that a heater element fails to earth. Suitable devices include a residual current
device (RCD) – this is the preferred method and should be used whenever possible – or an
insulation monitoring device.
•Maximum recommended setting for the RCD: 300mA/10mS. The duration time of
10mS (ten milliseconds) ensures that any fault is detected within a single cycle of a
thyristor system (where applicable).
•Maximum recommended setting for the insulation monitoring device: Insulation
resistance is not greater than 50 ohms per volt of rated voltage.
Ensure that the equipment is earthed in accordance with the plant earthing philosophy.

6. Installation Instructions
Page 10
If fitted, an anti-condensation heater must be protected by a 30mA earth leakage circuit
breaker. Recommended systems are available from EXHEAT Industrial Ltd upon request.
Before commissioning the equipment, the completed installation should be approved by an
authorised & competent person to ensure that it has been carried out correctly and that the
system is safe for commissioning.
Before switching the Anti-Condensation heater circuit on, ensure that all of the relevant
requirements, and any special conditions of use requirements have been adhered to. Refer
to Section 7.

7. Special Conditions of Use
Page 11
7. Special Conditions of Use
Please adhere to the warnings within this IOM and on the heater/thermostat nameplates,
when using the equipment. Please also note the special conditions of use as listed below:
•The HEF type heater (with or without an additional in-line thermostat) must be
installed within an enclosure with the minimum of IP54 protection.
•The Flying lead on the HEF type heater (with or without an additional in-line
thermostat) must be connected to suitably rated terminals, either within a safe area
or within Ex e type terminal box – as a minimum.
•The equipment is not field serviceable by the user and shall not be opened.
•The equipment shall be installed so that pulling, flexing or mechanical damage of the
cable is prevented.
•The equipment has non-conductive surfaces which are a potential electrostatic charging
hazard – see the instructions for guidance.
•The equipment shall be supplied via a fuse that is mounted externally in a safe area and
rated at 277 V ac, 6 A maximum. The fuse shall have a breaking capacity which exceeds
the prospective short circuit current of the supply

8. Operating Instructions
Page 12
8. Operating Instructions
General
Electrical equipment must be designed, tested and installed such that, when it is used
correctly, health and safety risks are kept to a minimum. The client must be provided with
information about any necessary safety conditions, warned of any possible hazards that may
arise during normal operation and told how to avoid them.
•The HEF heater is to be designed to self-regulate the temperature within the cabinet
or enclosure by means of the internal self-limiting cable installed within it. Should
overall temperature regulation be required it can be wired in series with an EXHEAT
Industrial Ltd thermostat, such as the AFT, HFT or the FXT range.
•There is no temperature adjustment required for this heater, it will self-regulate.
Should a thermostat be installed, refer to the relevant thermostat IOM for
temperature setting instructions.
•The HEF range is designed to operate in ambient temperatures of up to +80°C and
the user must ensure that this maximum ambient temperature is not exceeded at any
time. Refer to section 3.
CAUTION – If a thermostat is used, check that the voltage and current of the
HEF to be controlled by the thermostat is compatible with the ratings of the
thermostat before energising.
The user must ensure that the following is adhered to:
•Any employees working on the equipment are authorised & competent in the proper
working procedures in order to ensure their and others safety. The plant must be
maintained in a safe condition.
•Carefully remove all protective packaging and visually inspect product for any transit
damage.
•The heaters must be handled with care and stored in clean and dry conditions, as per
Section 4.
•All prevailing rules, regulations and bylaws in force at the time and place of
installation must be observed.
•The heater should be securely fixed in position (adhering to the correct orientation if
applicable) and all the client made terminal connections checked for tightness before
energising.
•Refer to the relevant code of practice for the equipment:
•IEC/EN 60079-14 for selection and installation or the relevant global equivalent.
•IEC/EN 60079-17 for inspection and maintenance of electric apparatus for use in
potentially explosive atmospheres or the relevant global equivalent.
•Ensure that any special conditions for use detailed on the Hazardous Area
Certification are complied with (see additional certification booklet supplied with this
product).

8. Operating Instructions
Page 13
Any modification not carried out by EXHEAT Industrial Ltd could invalidate certification and
warranty.
Provided the above conditions are adhered to, the equipment should be safe for use under
normal operating conditions.
It is virtually impossible to achieve conditions which are completely hazard-free when
working on energised circuits. Responsibility for safe conduct of the authorised & competent
person or persons operating on the equipment rests with those under whose authority they
act.

9. Maintenance Instructions
Page 14
9. Maintenance Instructions
General Safety Precautions
The end user must ensure that maintenance, installations, commissioning and testing of the
equipment is only carried out by authorised and competent persons.
The following rules must be adhered to:
•All prevailing site safety regulations shall be adhered to at all times.
•Check for hazardous gases before and during any maintenance activity.
•Fully isolate the equipment from the electrical supply before and whilst any work is
being carried out.
•Before removing the terminal enclosure lid/doors, allow sufficient time for the internal
HEF range heater to cool down after electrical isolation.
•Comply with safe working conditions.
•Do not work alone on the equipment when it is energised.
•Familiarise all persons working on the equipment with the instructions and
information provided within this manual.
•Be aware of hazards which may arise when working on energised equipment and
take all necessary precautions.
The following preventative maintenance should be carried out at the intervals shown below,
for any replacement parts, please contact EXHEAT Industrial Ltd.
Compliance with these maintenance instructions is a mandatory requirement. Documented
evidence must be maintained in the form of a signed checklist. Copies of completed
checklists and records will be required in the event of a warranty claim. Refer to Section 14.
If the HEF heaters are not used for more than three months they must be
tested for insulation resistance.
Three-monthly Maintenance Inspections
•Generally, inspect the equipment for external damage.
•Ensure that the product is clear of obstruction and that the airflow remains
unrestricted.
Six-monthly Maintenance Inspections
The following should be undertaken every six months with the addition to the three-monthly
maintenance inspections above:

9. Maintenance Instructions
Page 15
•Isolate the electrical supply as per Section 6.
•The HEF heater and thermostats should be clean, dry and free from debris.
•Ensure that electrical terminations and cable glands are undamaged and secure.
•Measure the overall insulation resistance of the heater. Use a 500V dc
megohmmeter to take a reading between the earth and the phase terminals. The
reading should be greater than 2 megohm. If it is not, refer to Section 5.
•Earth continuity must be maintained between all earth points and the main structure,
ensure that any earth conductors are correctly and securely fitted between all earth
points and main structure.
•Ensure all trip devices are working properly.
Annual Inspections and Long-Term Storage Inspections
Ensure that the following inspections are carried out if equipment is in storage or in use for a
year or more:
•Undertake the recommended three-monthly and six-monthly inspections as
above.
•Inspect for low insulation resistance, as Section 5.
•Only EXHEAT Industrial Ltd can undertake any replacements in hazardous area
equipment, any unauthorised modifications will invalidate the hazardous area
certification and any warranty.
•If equipment is being left unused for a period greater than three months, undertake
the 6-monthly maintenance before energizing.
Only EXHEAT Industrial Ltd or approved Services Representative are
authorised to replace HEF related components. The hazardous area
certification and warranty will be invalidated if this requirement is not strictly
observed.

10. Fault Finding, Correction and Spares
Page 16
10. Fault Finding, Correction and Spares
All HEF Type Heaters
See Maintenance instructions for procedures relating to these faults.
Fault
Check
Resolution
Heater fails to achieve
required design air
temperature
•Isolated power supply.
•Supply fuses.
•Is the ambient temperature greater
than that required (thermostat has
turned off). (if thermostat installed)
•The designed heating output is less
than the required amount, or is
there greater heat loss due to a
change in location.
Contact EXHEAT Industrial Ltd
for advice.
Air temperature too high
•Temperature control device set
points correct?
•Does the compartment have a
thermostat switch? If so is it
switching the heater correctly?
Check with the installer.
Earth leakage trip
Limiting earth-fault currents (magnitude
and/or duration) is essential for safety.
The earth-fault protection device is
intended to provide critical safety
protection if there is current leakage to
earth. Fully investigate and rectify any
trip condition before resetting the
system and operating the unit again.
Where an earth leakage trip has
occurred, isolate the unit and:
•Check insulation resistance
is according to Section 4.
•Check settings of earth
leakage protection device
are according to Section 5.
In-line thermostat not
switching
Ambient temperature against the
temperature set point of the thermostat
Refer to the thermostat IOM for
further diagnosis assistance.
Spares
There are no spares available for the HEF range (including the in-line thermostat options).
Should any item be damaged or not working correctly, it will need to be sent back to
EXHEAT Industrial Ltd for any remedial work. Contact us via www.exheat-
industrial.com/contact/support

11. COSHH Statement
Page 17
11. COSHH Statement
Health and Safety Information
There are no hazardous or toxic substances applied with this order as defined in COSHH
(control of substances hazardous to health) regulations (2002).

12. General Arrangement Drawings
Page 18
12. General Arrangement Drawings
HEF_iom_dwg_1

12. General Arrangement Drawings
Page 19
HEF_iom_dwg_2

12. General Arrangement Drawings
Page 20