Nabertherm N 7/H, N 11/H, N 11/HR, N 17/HR, N 31/H Operating Instructions Manual

Operating Instructions

Chamber Furnaces for Annealing,
Hardening and Brazing

N 7/H - N 87/H

-> 01.2016

Original instructions

www.nabertherm.com

 Made

 in

 Germany

Copyright

 Copyright by
Nabertherm GmbH
Bahnhofstrasse 20
28865 Lilienthal
Federal Republic of Germany

Reg: M01.0071 ENGLISCH
Rev: 2016-06

No responsibility is accepted for the correctness of this information. We
reserve the right to make technical alterations.

2

1 Introduction ........................................................................................................................................................... 5

1.1 Product Description ........................................................................................................................................... 6

1.2 Overview of the Complete Furnace ................................................................................................................... 8

1.3 Safeguarding against Dangers Posed by Over-Temperature ........................................................................... 12

1.3.1 Key to the Model Names ............................................................................................................................ 13

1.4 Scope of Delivery ............................................................................................................................................ 13

2 Specifications ....................................................................................................................................................... 15

2.1 Warranty and Liability .................................................................................................................................... 16

3 Safety .................................................................................................................................................................... 16

3.1 Intended Use.................................................................................................................................................... 16

3.2 Requirements for the Furnace Operator .......................................................................................................... 18

3.3 Requirements for the Operating Personnel ...................................................................................................... 19

3.4 Protective Clothing .......................................................................................................................................... 20

3.5 Basic Measures During Normal Operation ..................................................................................................... 21

3.6 Basic Measures in Case of Emergency ........................................................................................................... 21

3.6.1 What to do in an Emergency ....................................................................................................................... 21

3.7 Basic Measures for Servicing and Maintenance.............................................................................................. 23

3.8 Environmental Regulations ............................................................................................................................. 24

3.9 Explanation of the Symbols and Warnings ..................................................................................................... 24

3.10 General Risks with the Furnace ....................................................................................................................... 28

4 Transportation, Installation, and Commissioning ............................................................................................ 30 

4.1 Delivery ........................................................................................................................................................... 30

4.2 Unpacking (N 7/H - N 17/HR) ........................................................................................................................ 33

4.3 Unpacking (N 31/H - N 87/H) ......................................................................................................................... 34

4.4 Transportation Securing Equipment/Packaging .............................................................................................. 36

4.5 Constructional and Connection Requirements ................................................................................................ 36

4.5.1 Installation (Furnace Location) ................................................................................................................... 36

4.6 Assembly, Installation, and Connection .......................................................................................................... 38

4.6.1 Venting Exhaust Fumes .............................................................................................................................. 38

4.6.2 Insertion of the Base Plate .......................................................................................................................... 39

4.6.3 Assembling the Controller (Depending on the Model) ............................................................................... 40

4.7 Installation of an Extraction Flue, Extraction Flue with Fan or Extraction Flue with Fan and Catalyst

(Accessories for N 7/H – N 17/HR) .............................................................................................................................. 42

4.7.1 Connecting the Furnace to the Power Supply ............................................................................................. 43

4.8 Commissioning ............................................................................................................................................... 46

4.9 Loading/Charging ........................................................................................................................................... 47

4.10 Recommendations for Heating the Furnace for the First Time ....................................................................... 48

5 Operation ............................................................................................................................................................. 49

5.1 Controller ........................................................................................................................................................ 49

6 Operation, Display and Switch Elements (depending on design) .................................................................... 50

6.1 Turning on the Controller/Furnace .................................................................................................................. 50

6.2 Turning off the Controller/Furnace ................................................................................................................. 51

6.2.1 Handling the Controller .............................................................................................................................. 52

6.3 Opening and Closing the Door ........................................................................................................................ 52

6.3.1 Charging Plate ............................................................................................................................................ 53



3

6.4 Operation with Heat Treatment Accessories ................................................................................................... 54

7 Servicing, Cleaning, and Maintenance .............................................................................................................. 55

7.1 Furnace Insulation ........................................................................................................................................... 56

7.2 Shutting Down the Furnace for Servicing, Cleaning, and Maintenance ......................................................... 57

7.3 Regular Maintenance Tasks for the Entire System ......................................................................................... 58

7.4 Regular Maintenance of the Furnace ............................................................................................................... 58

7.5 Regular Maintenance Tasks – Switchgear ...................................................................................................... 59

7.6 Regular Maintenance Tasks – Electrical Testing ............................................................................................ 61

7.7 Regular Maintenance Tasks – Documentation ................................................................................................ 62

7.8 Cleaning Products ........................................................................................................................................... 63

8 Malfunctions ........................................................................................................................................................ 64

8.1 Error Messages of the Controller .................................................................................................................... 64

8.2 Warnings of the Controller .............................................................................................................................. 67

8.3 Malfunctions of the Switchgear ...................................................................................................................... 68

8.4 Controller Check List ...................................................................................................................................... 70

9 Spare Parts/Wearing Parts ................................................................................................................................. 72

9.1 Replacing a Heating Element .......................................................................................................................... 76

9.2 Replacing a Thermocouple .............................................................................................................................. 81

9.3 Electrical Schematics/Pneumatic Schematics ................................................................................................. 83

10 Nabertherm Service ............................................................................................................................................ 83

11 Shut-Down, Dismantling, and Storage............................................................................................................... 84

11.1 Transportation/Return Transportation ............................................................................................................. 85

12 Declaration of Conformity .................................................................................................................................. 86

4

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1 Introduction

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Dear Customer,

Thank you for choosing a quality product from Nabertherm GmbH.

You can be proud that you have chosen a furnace which has been especially tailored to suit
your manufacturing and production conditions.

This product is characterized by

 professional workmanship
 high performance due to its high efficiency
 high-quality insulation
 low power consumption
 low noise level
 simple installation
 easy to maintain
 high availability of spare parts

Your Nabertherm Team

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Note

These documents are intended only for buyers of our products and may not be copied or
disclosed to third parties without our written consent. (Law governing copyright and
associated protective rights, German Copyright Law from Sept. 9, 1965)

Protective Rights

Nabertherm GmbH owns all rights to drawings, other documents and authorizations, also in
case of applications for protective rights.

Note

All the figures in the instructions have a descriptive character; in other words, they do not
represent the exact details of the furnace.

Note

The pictures contained in the instruction manual may contain inaccuracies in terms of the
function, design and furnace model.

5

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1.1 Product Description

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These electrically heated furnaces are a high-quality product which will give you many
years of reliable service if they are properly cared for and maintained. One basic
prerequisite is that the furnace is used the way it was designed to be used.

During development and production a high priority was placed on safety, functionality and
economy.

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These universal chamber furnaces with radiation heating are designed for tough heat
treatment applications. They are perfect for processes in toolmaking and in the hardening
shop, such as annealing, hardening and forging. A wide variety of accessories enables these
furnaces to be tailored to the relevant application.

Other Characteristics of this Product are:

 Heating from three sides (both sides and the floor)
 Heating elements on carrier tubes ensure free heat radiation and a long service life
 Bottom heating protected by heat-resistant SiC tiles
 Multi-layer insulation with high-quality refractory insulation inside the furnace
 Exhaust air opening on the left side of the furnace, from N 31/H in the rear wall
 Models N 7/H – N 17/HR are designed as tabletop models
 Base included from model N 31/H
 Parallel swing door, which opens downward; if required, also available with lift door

that opens upward (N 31/H to N 87/H)

 Top part of door with stainless steel plates to prevent burning when the door is opened

at high temperatures (from model N 31/H)

 Temperature uniformity according to DIN 17052-1 to +/- 10 °C
 Door movement cushioned with gas springs (from model N 31/H)

Additional Equipment

 Over-temperature limiter with adjustable cutout temperature for thermal protection

class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace
and load

 Process control and documentation via VCD software package for monitoring,

documentation and control

Accessories

 Extraction flue with fan or catalyst (not for model N 31/H – N 87/H)
 NTLog for Nabertherm controller: Recording process data with a USB flash drive
 Charging plate
 Annealing and hardening foil
 Protective gas boxes for protective gas atmosphere with additional charge

thermocouple Type K

 Manual or automatic gas supply system
 Protective gas hardening system

6

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 Digital temperature measurement device to measure the temperature in the protective

gas boxes

 Roller conveyors
 Cooling station

7

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1.2 Overview of the Complete Furnace

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Furnace model N 7/H – N17/HR (similar to picture)

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Fig. 1: Overview: Example shows chamber furnace N 7/H (table-top model) (similar to picture)

8

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Furnace model N 31/H - N 87/H (similar to picture)

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Fig. 2: Overview: Example chamber furnace N 41/H (similar to picture)

9

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Fig. 3: Chamber furnace, rear view N 7/H – N 17/HR (similar to picture)

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Furnace model N 31/H – N 87/H with power supply
cable (depending on connection voltage)

Furnace model N 31/H – N 87/H with fixed

power connection and main switch (depending on
connection voltage)

Fig. 4: Chamber furnace, rear view N 31/H – N 87/H (similar to picture)

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No. Name
1
2
3
4
5
6
7
8
9
10

Controller B400/C440/P470 (depending on model)

USB interface (NTLog for Nabertherm Controller: Recording Process Data with a USB Flash Drive)

Parallel swing door, opens downward

Power switch with integrated fuse (switching furnace on/off)

Base included from model N 31/H

Multi-layer insulation with high-quality refractory insulation inside the furnace

Furnace chamber

Opening for a gas supply system (remove perforation)

Heating elements on carrier tubes ensure free heat radiation and a long service life

Bottom heating protected by heat-resistant SiC tiles

11
12

10

Door movement cushioned with gas springs (from model N 31/H – N 87/H)

Exhaust air opening

No. Name
13
14
15
15a
16
17
18

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Additional Equipment

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Thermocouple

Extraction flue (Model N 7/H – N 17/HR)

Power plug with snap-in coupling (to 3600 watts)

CEE power plug (from 3600 watts) (depending on connection voltage)

Additional power connection (for accessories)

Fuse for additional power connection (for accessories)

Main switch (depending on connection voltage)

Fig. 5: Example (similar to picture)

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Accessories

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Over-temperature limiter with adjustable cutout
temperature for thermal protection class 2 in accordance
with EN 60519-2 as temperature limiter to protect the
furnace and load

Extraction flue with fan, to improve extraction of

exhaust gases from the furnace. Can be switched with
Controller B400 - P480, depending on the program (only
for N 7/H – N 17/HR)

Catalyst to clean organic components in the exhaust air. The

organic components are catalytically incinerated at approx.
600 °C; i.e. separated into carbon dioxide and steam. This
largely eliminates smells. With Controllers B400 - C440, the
catalyst can be switched in relation to the program (only for
N 7/H – N 17/HR)

*Note: If other controllers are used, an adapter cable must be ordered for connection to a separate socket. The device is
activated when it is plugged in.

Fig. 6: Example: (similar to picture)

11

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Safety control circuit

1.3 Safeguarding against Dangers Posed by Over-Temperature

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Over-temperature limiters with manual reset/with automatic reset to protect against over­temperature in the furnace chamber are available for Nabertherm GmbH furnaces either as
a standard feature (depending on the model series) or as additional equipment (customized
design).

The over-temperature limiter with manual reset/with automatic reset monitors the furnace
chamber temperature. The display shows the most recently set cut-off temperature. If the
furnace chamber temperature rises about the pre-set cut-off temperature the heating is shut

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down to protect the furnace, the charge and/or the operating equipment.

DANGER

• Danger caused by incorrectly entered cut-off
temperature at the over-temperature limiter with
manual reset/over-temperature limiter with automatic
reset.

• Mortal danger

• If, as a result of over-temperature from the charge and/or the

operating equipment, a charge is likely to be damaged at this pre­set cut-off temperature of the over-temperature limiter with
manual reset/over-temperature limiter with automatic reset, or if
the charge itself becomes a source of danger for the furnace or its
surroundings, the cut-off temperature must be reduced at the
over-temperature limiter with manual reset/automatic reset to the
maximum permissible value.

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Read the operating instructions of the over-temperature limiter with manual reset/with
automatic reset before starting the furnace. The safety sticker must be removed from the
over-temperature limiter with manual reset/with automatic reset. Any time a change is
made in the heat treatment program, the maximum permissible cut-off temperature (alarm
trigger temperature) at the over-temperature limiter with manual reset/with automatic reset
must be checked or re-entered.

We recommend setting the maximum setpoint temperature of the heating program in the
limiter between 5 °C and 30 °C, depending on the physical characteristics of the furnace,
below the trigger temperature of the over-temperature limiter with manual reset/with
automatic reset. This prevents an unwanted triggering of the over-temperature limiter with
manual reset/with automatic reset.

Description and function, see the
Operating Instructions of the over­temperature limit controller/guard

12

Fig. 7: Removing the sticker (similar to picture)

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1.3.1 Key to the Model Names

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Example Explanation
N 41/H

N = Chamber furnace

N 41/H

7 = 9 liter furnace (volume in l)
11 = 11 liter furnace (volume in l)
17 = 17 liter furnace (volume in l)
25 = 25 liter furnace (volume in l)
31 = 31 liter furnace (volume in l)
41 = 41 liter furnace (volume in l)
61 = 61 liter furnace (volume in l)
87 = 87 liter furnace (volume in l)

N 41/HR

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13 = Tmax. 1300 °C (2372 F)
H = High temperature Tmax. 1280 °C (2336 F)
R = Increased power

Fig. 8: Example model designation (type plate)

1.4 Scope of Delivery

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The scope of delivery includes:

System components Quantity Comment

Chamber furnace 1 x Nabertherm GmbH

Power cable1) 1 x Nabertherm GmbH

SiC floor plate 1 x Nabertherm GmbH

Charging plate2) 1 x Nabertherm GmbH

13

System components Quantity Comment

)

Annealing and hardening foil2)

4

Nabertherm GmbH

Protective gas box1) 1 x Nabertherm GmbH

Other components, variable depending on the

- - - See shipping documents

particular design

Document type Quantity Comment

Operating Instructions 1 x Nabertherm GmbH

Operating Manual for Controller 1 x Nabertherm GmbH

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Operating Instructions for
Protective Gas and Carburization Systems1)

Other documents, variable depending on the

1 x Nabertherm GmbH

1 x

particular design

1)

included with delivery depending on design/furnace model

2)

included with delivery if required, see shipping documents

3)

quantity depends on furnace model

4)

quantity as required, see shipping documents

Note

Store all documents carefully. All the functions of this furnace were tested during
manufacturing and prior to shipping.

Note

The documents included do not always contain the electrical schematics and pneumatic
schematics.

If you need the respective schematics they can be ordered from Nabertherm Service.

14

2 Specifications

Electrical specifications are on the type plate located on the side of the furnace.



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Model Tmax Inner dimensions in

mm

°C w d h in l W D H in kW in kg

N 7/H1 1280 250 250 140 9 600 650 600 3,0 60 180

N 11/H1 1280 250 350 140 11 600 750 600 3,5 70 180

N 11/HR1 1280 250 350 140 11 600 750 600 5,5 70 120

N 17/HR1 1280 250 500 140 17 600 900 600 6,4 90 120

N 31/H 1280 350 350 250 31 880 1100 1340 15,0 210 105

N 41/H 1280 350 500 250 41 880 1250 1340 15,0 260 120

N 61/H 1280 350 750 250 61 880 1500 1340 20,0 400 120

Volume Outer dimensions in mm Heating

power

Weight Minutes

to Tmax2

N 87/H 1280 350 1000 250 87 880 1750 1340 25,0 480 120

1

table-top model

2

If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE

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Fig. 9: Dimensions

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Electrical connection 1-phase: 3-phase:

1

, N 17/HR1

Furnace model

N 7/H

N 11/H

N 11/HR

N 31/H, N 41/H

N 61/H, N 87/H

Thermal protection class

Voltage (V): See type plate on furnace

Frequency (Hz): See type plate on furnace

according to DIN EN 60519-2

Furnaces:

without safety controller: Class 0
with safety controller: Class 2

15

Protection rating

Furnaces:

Protection type
Ambient conditions for

electrical equipment
Weights

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Temperature: Humidity:

Furnace with accessories Varies (see shipping documents)

Emissions

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1

Heating only between two phases

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2.1 Warranty and Liability

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As regards warranty and liability, the normal Nabertherm warranty terms apply,
unless individual terms and conditions have been agreed. However, the following
conditions also apply:

Warranty and liability claims for personal injury or damage to property shall be excluded if
they are attributable to one or more of the following causes:

 Everyone involved in operation, installation, maintenance, or repair of the furnace

must have read and understood the operating instructions. No liability will be accepted
for damage or disruptions to operation resulting from non-compliance with the
operating instructions.

 Not using the furnace as intended,
 Improper installation, start-up, operation, or maintenance of the furnace,
 Operation of the furnace with defective safety equipment or improperly installed or

non-functioning safety and protective equipment,

 Not observing the references in the operating instructions to transportation, storage,

installation, start-up, operation, maintenance, or equipping the furnace,

 Making unauthorized changes to the furnace,
 Making unauthorized changes to the operating parameters,
 Making unauthorized changes to the parameterization, the settings, or the program,
 Original parts and accessories are designed especially for Nabertherm furnaces.

Replace parts only with original Nabertherm parts. Otherwise the warranty will be
void. Nabertherm accepts absolutely no liability for damage caused by using parts that
are not original Nabertherm parts.

 Catastrophes due to third-party causes and force majeure.

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§

1

IP20

+5 °C to + +40 °C
max. 80% non-condensing

Continuous sound pressure
level:

< 80 dB(A)

3 Safety

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3.1 Intended Use

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Safety

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16

The Nabertherm furnace was designed and built in conformance with a careful selection of
the applicable harmonized standards and other technical specifications. Hence, it
corresponds to the state of the art and assures the greatest degree of safety.

Only materials whose characteristics and melting temperatures are known may be heated.
Consult any available safety-related material data sheets.

These universal chamber furnaces with radiation heating are designed for tough heat
treatment applications. They are perfect for processes in toolmaking and in the hardening

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Safety

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shop, such as annealing, hardening and forging. A wide variety of accessories enables these
furnaces to be tailored to the relevant application.

 Under certain circumstances gases or materials may be released from the materials in

the furnaces that settle on the insulation or the heating elements and destroy them. If

applicable, read the labels and instructions on the packaging of materials that
you use.

 Only materials whose characteristics and melting temperatures are known may be

heated. Consult any available safety data sheets of the materials. Any other use
beyond this is improper, including the processing of products other than those for
which the furnace was intended as well as handling hazardous materials or materials
dangerous to health, and must be approved in writing by the manufacturer Nabertherm
GmbH.

 Any other use, such as processing of products other than those for which the furnace

was intended as well as handling hazardous materials or materials dangerous to health
is deemed IMPROPER and such uses must be approved in writing by Nabertherm.

 Furnaces with over-temperature limit controllers must have their shut-down

temperatures set to prevent any overheating of the material.

 The set-up instructions and safety regulations must be followed, otherwise the furnace

will be considered improperly used, effectively cancelling any claims against
Nabertherm GmbH. The EC Declaration of Conformity will cease to be valid if any
modifications are made to the machine without our approval.

 The set-up instructions and safety regulations must be followed, otherwise the furnace

will be considered improperly used, effectively cancelling any claims against
Nabertherm GmbH.

 Opening the furnace while it is still hot, over 200 °C (392 °F), can lead to increased

wear of the following components: insulation, door seal, heating elements and furnace
housing. No liability shall be accepted for any damage to the goods or the furnace
resulting from non-compliance with this warning.

Operation with power sources, products, operating equipment, auxiliary materials, etc.,
which are listed as hazardous or which may in any way harm the health of the operator is
prohibited.

The furnace must not be filled with materials or substances that release explosive gases or
vapors. Only materials and substances whose properties are known may be used.

- This furnace was designed for commercial use. The furnace is not designed

for heating food, animals, wood, grain, etc.

- The furnace must not be used to heat the workplace.

- Do not use the furnace to melt ice or for similar purposes.

- Do not use the furnace as a clothes dryer.

Caution

Applicable safety instructions are contained in individual chapters.

17

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The operator is liable for any resulting damages.

Caution

Operating the furnace with explosive gases or mixtures, including explosive gases or
mixtures created as a result of heating/drying, is prohibited.

This furnace features no safety technology for processes which produce combustible

mixtures, for example debinding.

If the furnace is still used for such processes despite this fact, the concentration of organic
gas mixtures in the furnace must never exceed 3% of the lower explosion limit (LEL). This
pre-requisite applies not only to normal operation but, in particular, to exceptional
situations such as process disruptions (caused, for example, by the failure of a power unit).
You must ensure that the furnace is adequately ventilated and vented.

Nabertherm offers a broad range of furnaces which were especially developed for processes
involving the use of combustible gas mixtures.

Note

This product does not comply with the ATEX Directive and may not be used in ignitable

atmospheres. It must not be operated with explosive gases or mixtures or during processes
where explosive gases or mixtures are produced.

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3.2 Requirements for the Furnace Operator

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The set-up instructions and safety regulations must be followed, otherwise the furnace will
be deemed to have been used improperly, effectively cancelling any claims against
Nabertherm GmbH.

This level of safety when operating the furnace can be achieved only if all the necessary
measures have been taken. It depends on the furnace operator's diligence in planning these
measures and controlling how they are carried out.

The operator must ensure that

 all harmful gases are removed from the workplace, for example by an extraction

system,

 the extraction system is switched on,
 the workplace is properly ventilated,
 the furnace is operated only in a perfect operating condition and, in particular, that the

functions of the safety components are checked regularly.

 the required personal protective equipment is available for and used by the operating,

maintenance, and repair personnel.

 these operating instructions, including the supplier documentation, are kept near the

furnace. These instructions must be available at all times for anyone working with or
on the furnace;

 all the safety and operating instruction signs on the furnace can be read properly.

Damaged or unreadable signs must be replaced immediately,

 furnace personnel are informed regularly about all issues involving occupational

safety and environmental protection and are familiar with all the operating
instructions, especially those involving safety,

 a risk assessment is carried out (in Germany, covered of the Occupational Safety Act)

to determine any other hazards that may result from the working conditions particular
to the furnace's location,

18

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 all other instructions and safety guidelines that have been determined in a risk

assessment for the workplace are compiled in an operation manual (in Germany,
covered of the Ordinance Regulating the Use of Operating Equipment).

 Only sufficiently qualified and authorized personnel may operate, maintain and repair

the system. This personnel must be trained in how to operate the furnace and must
confirm their participation in the training with a personal signature. The training
program must be documented in detail. In case an operator is replaced, additional
training must also take place. The additional training may only be performed by
authorized, trained individuals familiar with the system. The additional training must
be painstakingly documented and participation must be evidenced by the names and
signatures of the participating employees.

Operating the Furnace

 Operating the furnace with explosive gases or mixtures, i.e., including any explosive

gases or mixtures created as a result of heating/drying, is prohibited.

 A furnace opened while still hot radiates enormous heat energy, which can cause

burns.

 Working with the furnace, for example opening the furnace door, etc., is only

permissible when the whole space needed for the door to swing out, the danger zone,
is visible to the operator.

 When working at the furnace with high temperatures, the appropriate protective

clothing and protective goggles must be worn.

 Danger! Risk of burns:
 Several spots on the housing and components of the control box can become hot

enough during normal operation to cause skin burns.

 When the vent supports are hot, touching them will lead to burns.

Note

If the protective gas boxes are used, a working temperature to 1100 °C (2012 °F) is
recommended; with working temperatures to 1150 °C (2102 °F) the boxes will suffer
increased wear.

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a

Note

In Germany, the general accident protection guidelines must be observed. The national
accident prevention regulations of the country of operation apply.

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3.3 Requirements for the Operating Personnel

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Everyone involved in operation, installation, maintenance, or repair of the furnace must
have read and understood the operating instructions. No liability will be accepted for
damage or disruptions to operation resulting from non-compliance with the operating
instructions.

Only adequately qualified and authorized persons may operate, maintain, or repair the
furnace.

Operating personnel are instructed regularly in all aspects of occupational safety and
environmental protection and are familiar with all the operating instructions, in particular,
safety instructions.

Only trained personnel may operate the control and safety equipment.

The operator should complete these details:

 Operator

19

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_______________________________________________________________

 The furnace may only be transported by

_______________________________________________________________

 The furnace may only be installed by

_______________________________________________________________

 The furnace may only be commissioned by

_______________________________________________________________

 Initial instructions may only be given by

_______________________________________________________________

 Malfunctions may only be rectified by

_______________________________________________________________

 The furnace may only be maintained by

_______________________________________________________________

 The furnace may only be cleaned by

_______________________________________________________________

 The furnace may only be serviced by

_______________________________________________________________

 The furnace may only be repaired by

_______________________________________________________________

 The furnace may only be shut down by

_______________________________________________________________

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3.4 Protective Clothing

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When close to furnaces, heat treatment accessories and similar components, wear protective
clothing that is resistant to heat and splashes of quenching media.

Wear a full-face mask that is resistant to heat and splashes of quenching media.

DANGER

• Danger caused by incorrectly entered cut-off
temperature at the over-temperature limiter with
manual reset/over-temperature limiter with automatic
reset.

• Mortal danger

• If, as a result of over-temperature from the charge and/or the

operating equipment, a charge is likely to be damaged at this pre­set cut-off temperature of the over-temperature limiter with
manual reset/over-temperature limiter with automatic reset, or if
the charge itself becomes a source of danger for the furnace or its
surroundings, the cut-off temperature must be reduced at the
over-temperature limiter with manual reset/automatic reset to the
maximum permissible value.

20

Protect your hands when handling heat treatment accessories and similar components by
wearing heat-resistant gloves.

Protect your hands when cutting annealing and hardening foil/annealing envelopes by
wearing firm gloves.

Wear safety boots to protect your feet.

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3.5 Basic Measures During Normal Operation

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Risks during Normal Operation!

Before switching the furnace on, check and ensure that only authorized persons are in the
working area of the furnace and that no one can be injured as a result of operating the
furnace.

Before starting production each time, check and ensure that all the safety equipment works
properly.

Before starting production each time, check the furnace for obvious damage and ensure that
it is operated only in a perfect condition. Report any defects to a supervisor immediately.

Before starting production each time, remove all materials and objects that are not needed
for production from the working area.

At least once every day (see also Servicing and Maintenance) check the following:

 Check the furnace for obvious external damage,
 Check all hydraulic or pneumatic hoses, make sure that they are not leaking and that

they are connected properly (if applicable),

 Check all gas and oil lines, make sure that they are not leaking and that they are

connected properly (if applicable),

 Check that the fan works properly (if applicable)

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3.6 Basic Measures in Case of Emergency

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3.6.1 What to do in an Emergency

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Furnaces with power plug

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Note

The power plug is to be pulled out to stop the furnace in case of an emergency.

Therefore, the power plug must be accessible at all times when the furnace is operating so
that it can be pulled out quickly in case of an emergency.

21

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Fig. 10: Pull the power plug (similar to picture)

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Furnaces with main switch

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I ON

Note

In an emergency, immediately switch off the voltage supply to the furnace at the main

O OFF

switch (position "O/OFF"). Wait until the furnace chamber and attaching parts have cooled

to room temperature.

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22

Fig. 11: Disconnect power to the system using the main switch (similar to picture)

Risks during Normal Operation!

Switch the furnace off immediately in case of unexpected occurrences in the furnace (e.g. a
lot of smoke or unusual smells). Wait until the furnace has cooled naturally to room
temperature.

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In case of a fire, keep
the door closed. This
will allow you to
prevent the spread of
smoke and keep out a
supply of oxygen.

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DANGER

• Danger from electric shock.

• Danger to life.

• Work on the electrical

equipment may be performed
only by qualified electricians
or by technicians authorized
by Nabertherm.

• Disconnect the furnace

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Warning - Danger of Electric Shock!

Work on the electrical equipment may be done only by qualified, authorized electricians.

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3.7 Basic Measures for Servicing and Maintenance

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Maintenance work must be performed by authorized persons following the maintenance
instructions and the accident prevention regulations. We recommend that the maintenance
and repair work be carried out by the service team of Nabertherm GmbH. Non-compliance
may cause injuries, death, or considerable damage to property.

Switch off the furnace and make sure it cannot be switched on again inadvertently (lock the
main switch and secure it with a padlock), or pull out the power plug.

Clear an adequate area around the furnace to facilitate the repair work.

Suspended loads are dangerous. Working beneath a suspended load is prohibited. There is a
risk of fatal injury.

Relieve the pressure on hydraulic or pneumatic equipment before carrying out maintenance
or repair work (if applicable).

When cleaning furnaces, control cabinets, or electrical equipment housings, never spray
them with water.

When maintenance or repair work has been completed, before recommencing production
ensure the following:

 Check that loosened screw connections have been re-tightened,

23

 Reinstall protective equipment, screens, and filters,
 Remove all material, tools, and other equipment used for the maintenance or repair

work from the working area of the furnace,

 Remove any liquids that have leaked,
 Check that all safety functions (e.g. emergency stop button) work properly,

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 Power cables may be replaced only with similar, approved cables.

3.8 Environmental Regulations

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All statutory duties regarding waste avoidance, proper recycling, and disposal must be
observed when work is carried out on and with the furnace.

Problem materials that are no longer needed, such as lubricants or batteries, must not be
placed in normal waste disposal systems or allowed to enter the sewage system.

During installation, repair, and maintenance work, substances that are hazardous to water,
such as

 lubricating grease and oils
 hydraulic oils
 refrigerants
 solvent-based cleaning fluids must not be allowed to contaminate the soil or enter the

sewage system.

These substances must be stored, transported, collected, and disposed of in suitable
containers.

Note

The operator must ensure that national environmental regulations are observed.

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When it is delivered, this furnace contains no substances that make a hazardous waste
classification necessary. However, residues of process materials may accumulate in the
furnace insulation during operation. These may be hazardous to health and/or the
environment.

 Dismantle the electronic components and dispose of them as electric scrap.
 Remove the insulation and dispose of it as hazardous waste (See Servicing, Cleaning,

and Maintenance with Ceramic Fiber Material)

 Dispose of the housing as scrap metal.

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3.9 Explanation of the Symbols and Warnings

Note

In the following operating instructions, specific warnings are given to draw attention to
residual risks that cannot be avoided when the furnace is operating. These residual risks
include dangers for humans/products/ the furnace, and the environment.

The symbols used in the operating instructions are especially intended to draw attention to
safety information.

The symbols used cannot replace the text of the safety information. Therefore, always read
the entire text.

Graphic symbols correspond to ISO 3864. In accordance with the American National
Standard Institute (ANSI) Z535.6 the following warning information and words are used in

this document:

24

The general hazard symbol, in combination with the words CAUTION, WARNING and
DANGER warns about the risk of serious injury. Observe the following information to

prevent injury or death.

NOTICE

Refers to a hazard that could damage or destroy the equipment.

CAUTION

Refers to a hazard with a minor or medium risk of injury.

WARNING

Refers to a hazard that could cause death, serious or irreversible injury.

DANGER

Refers to a hazard that could directly cause death, serious or irreversible injury.

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Structure of the Warning: All Warnings are Structured as Follows

Hazard symbol

Indicates the risk of injury

Signal word

Classifies the danger

WARNING

• Type and source of the danger

• Consequences of non-compliance

• Action to prevent danger

Graphical symbols (optional)
according to ISO 3864:

Consequences, measures, and
prohibitions

Reference texts:

• Type and source of the danger

• Possible consequences of non­compliance

• Measures/Prohibitions

or

Hazard symbol

Indicates the risk of injury

Signal word

Classifies the danger

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DANGER

• Type and source of the danger

• Consequences of non-compliance

• Action to prevent danger

Graphical symbols (optional)
according to ISO 3864:

Consequences, measures, and
prohibitions

Graphical symbols
(optional) according to ISO
3864:

Instructions or prohibitions

Reference texts:

• Type and source of the danger

• Possible consequences of non­compliance

• Measures/prohibitions

Information Symbols in the Instructions:

Note

Below this symbol you will find instructions and particularly useful information.

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Rule - Rule Sign

This symbol draws attention to important rules that must be followed. Rule signs protect
people against injury and show what is to be done in certain situations.

Rule - Important Information for Operators

This symbol draws the operator's attention to important information and operating
instructions that must be followed.

Rule - Important Information for Maintenance Personnel

This symbol draws the maintenance personnel's attention to important operating and
maintenance instructions (service) that must be followed.

Rule - Pull Out the Power Plug

This symbol tells the operator to pull out the power plug.

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Mandatory rule - Disconnect the furnace

This symbol informs the operator that before beginning any work the furnace must be
disconnected from the power supply and the applicable safety rules and accident prevention
regulations must be observed.

Rule - Lift only with Several People

This symbol draws the personnel's attention to the fact that this device may only be lifted
and moved to its final destination by several people.

Caution – Fingers or Hands May Be Crushed

This symbol warns the operator of the potential for fingers or hands to be crushed. Ignoring
this can lead to injury.

Warning - Hot Surface, Do Not Touch

This symbol warns the operator that the surface is hot and should not be touched.

Warning - Danger of Electric Shock

This symbol warns the operator that there is a risk of an electric shock if the following
warnings are not heeded.

Warning – Risk of Device Toppling Over

This symbol tells the operator that there is a risk of the device toppling over if the following
warnings are not heeded.

27