KNF N 920 APE-W Montageanleitung

KNF 121690-121708 09/19

OEM

N920

TRANSLATION OF ORIGINAL OPERATING AND

INSTALLATION INSTRUCTIONS

ENGLISH

DIAPHRAGM

VACUUM PUMP

Note!

Before operating the pump and the accessories, please read the operating instructions and pay attention to

the safety precautions!

 
Contents Page 
1. About this document.................................................................3 
2. Use............................................................................................4 
3. Safety........................................................................................6 
4. Technical Data..........................................................................9 
5. Design and function................................................................11 
6. Transportation.........................................................................13 
7. Installation and connection.....................................................14 
8. Operation................................................................................20 
9. Servicing.................................................................................32 
10. Troubleshooting......................................................................37 
11. Spare parts and accessories..................................................39 
12. Returns ...................................................................................40 
 
KNF Neuberger GmbH 
Alter Weg 3 
79112 Freiburg 
Germany 
Phone +49-(0)7664-5909-0 
Fax +49-(0)7664-5909-99 
 
E-mail: info@knf.de 
www.knf.de

Vacuum Pumps N 920 APE-W and N 920 APDC-B About this document

Original-Operating and Installation Instructions, english, KNF 121690-121708 09/19 3

1. About this document

1.1. Using the Operating and Installation

Instructions

The Operating and Installation Instructions are part of the pump.

➔Always keep the Operating and Installation Instructions handy

in the work area.

➔Pass on the Operating and Installation Instructions to the next

owner.

Customer-specific project pumps (pump models which begin with

“PJ” or “PM”) may differ from the Operating and Installation Instruc-

tions.

➔For project pumps, also observe the agreed upon specifica-

tions.

1.2. Symbols and markings

Warning

WARNING

A danger is located here.

Possible consequences of a failure to observe the

warning are specified here. The signal word, e.g.

Warning, indicates the danger level.

➔Measures for avoiding the danger and its conse-

quences are specified here.

Danger levels

Signal word

Meaning

Consequences if not observed

DANGER

warns of immedi-

ate danger

Death or serious injuries and/or

serious damage are the conse-

quence.

WARNING

warns of possible

danger

Death or serious injuries and/or

serious damage are possible.

CAUTION

warns of a possi-

bly dangerous

situation

Minor injuries or damage are

possible.

Tab. 1

Other information and symbols

➔An activity to be carried out (a step) is specified here.

1. The first step of an activity to be carried out is specified here.

Additional, consecutively numbered steps follow.

This symbol refers to important information.

Project pump

Use Vacuum Pumps N 920 APE-W and N 920 APDC-B

4 Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19

2. Use

2.1. Proper use

The pumps are exclusively intended for transferring gases and va-

pors.

Owner’s responsibility

Only install and operate the pumps under the operating parameters

and conditions described in Chapter 4. Technical Data.

Only complete pumps may be taken into service.

Make sure that the installation location is dry and the pump is pro-

tected against rain, splash, hose and drip water as well as other

pollutions.

The gas-tightness of the connections between the application

pipes and the pump (or the pump connection) must be checked

regularly; with leaky connections, there is a danger that hazardous

gases or vapors may escape from the pump system.

Before using a medium, check whether the medium can be trans-

ferred danger-free in the specific application case.

Before using a medium, check the compatibility of the materials of

the components in contact with the medium (see Chapter 4. Tech-

nical Data) with the medium.

Risk of hazardous gas mixtures during pump operation if dia-

phragm ruptures: Depending on the medium transferred, a hazard-

ous mixture may be produced in the case that the diaphragm rup-

tures, if the medium mixes with the air in the compressor housing.

Only transfer gases which remain stable under the pressures and

temperatures occurring in the pump.

Operating parameter and

conditions

Requirements for

transferred medium

Vacuum Pumps N 920 APE-W and N 920 APDC-B Use

Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19 5

2.2. Improper use

The pumps may not be operated in an explosive atmosphere.

The pumps are not suitable for transferring:

▪dusts

▪liquids

▪aerosol

▪biological and microbiological substances

▪fuel

▪explosive and combustible materials

▪fibers

▪oxidizing agent

▪foodstuffs.

The pumps are not suitable for use with aggressive media. Other

pumps in the KNF product line are designed for use with aggres-

sive media. Please contact us for more information.

The pumps must not be used to create vacuum and overpressure

simultaneously.

An overpressure must not be applied to the suction side of the

pump.

Safety Vacuum Pumps N 920 APE-W and N 920 APDC-B

6 Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19

3. Safety

Note the safety precautions in Chapter 7. Installation and con-

nection and 8. Operation.

The pumps are built according to the generally recognized rules of

the technology and in accordance with the occupational safety and

accident prevention regulations. Nevertheless, dangers can result

during their use which lead to injuries to the user or others, or to

damage to the pump or other property.

Only use the pumps when they are in a good technical and proper

working order, in accordance with their intended use, observing the

safety advice within the Operating and Installation Instructions, at

all times.

Components connected to the pump must be designed to with-

stand the pneumatic performance of the pump.

Take care that safety regulations are observed when connecting

the pump to the electricity supply.

Make sure that only trained and instructed personnel or specially

trained personnel work on the pumps. This especially applies to

assembly, connection and servicing work.

Make sure that the personnel has read and understood the Operat-

ing and Installation Instructions, and in particular the “Safety” chap-

ter.

Observe the accident prevention and safety regulations when per-

forming any work on the pump and during operation.

For pump N 920 APE-W: Open housing parts with notice sticker

(see Fig. 1) only after separating mains plug from power source.

Ensure that the pump is separated from the mains and is de-ener-

gized.

Make sure that there are no hazards due to flow with open gas

connections, noises or hot gases.

Ensure that an EMC-compatible installation of the pump is ensured

at all times and that this cannot lead to a hazardous situation.

When transferring dangerous media, observe the safety regula-

tions when handling these media.

If the diaphragm ruptures, the transferred medium will mix with the

air in the environment.

Take all necessary care to prevent this leading to a dangerous situ-

ation.

Be aware that the pumps are not designed to be explosion-proof.

Make sure the temperature of the medium is always sufficiently be-

low the ignition temperature of the medium, to avoid ignition or ex-

plosion. This also applies for unusual operational situations.

Note that the temperature of the medium increases when the pump

compresses the medium.

Personnel

Working in a safety

conscious manner

Fig. 1: notice sticker

Handling dangerous media

Handling combustible media

Vacuum Pumps N 920 APE-W and N 920 APDC-B Safety

Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19 7

Hence, make sure the temperature of the medium is sufficiently be-

low the ignition temperature of the medium, even when it is com-

pressed to the maximum permissible operating pressure of the

pump. The maximum permissible operating pressure of the pump

is stated in the technical specifications (Chapter 4).

If necessary, consider any external sources of energy, such as ra-

diation, that may add heat to the medium.

In case of doubt, consult the KNF customer service.

Store all replacement parts in a protected manner and dispose of

them properly in accordance with the applicable environmental pro-

tection regulations. Observe the respective national and interna-

tional regulations. This especially applies to parts contaminated

with toxic substances.

For the purposes of the Machinery Directive 2006/42/EC, pumps

are “partly completed machinery”, and are therefore to be regarded

as not ready for use. Partly completed machinery may not be com-

missioned until such time as it has been determined that the ma-

chine in which the partly completed machinery is to be assembled

is in conformity with the provisions of the Machinery Directive

2006/42/EC. The following essential requirements of Annex I of Di-

rective 2006/42/EC (general principles) are applied and observed:

−General Principles No. 1

−No. 1.1.2. / 1.1.3. / 1.3.1. / 1.3.3. / 1.3.4. / 1.4.1. / 1.5.1.* /

1.5.2.* / 1.5.8. / 1.5.9. / 1.7.4. / 1.7.4.1. / 1.7.4.3.

−(*only for N 920 APE-W)

As these partly completed machinery are OEM-models the power

supplies and the equipment for disconnecting and switching-off the

partly completed machinery respectively have to be considered

when mounting as well as over-current and overload protective

gear.

In addition a protection against mechanical parts in motion and hot

parts, if existing, has to be provided when mounting.

The pumps conform to the Directive 2011/65/EU.

The following harmonized standards have been used:

N 920 APE-W

N 920 APDC-B

DIN EN 61326-1 (Class A)

DIN EN 61000-6-2/3

DIN EN 50581

DIN EN 60204-1

DIN EN 50581

Tab. 2

Environmental protection

EU/EC Directives / Standards

Safety Vacuum Pumps N 920 APE-W and N 920 APDC-B

8 Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19

The pump is maintenance-free. But KNF recommends, checking

the pump regularly with regard to conspicuous changes in noise

and vibrations.

Only have repairs to the pumps carried out by the KNF Customer

Service responsible.

Housing with voltage-caring parts may be opened by technical per-

sonnel only.

Use only genuine parts from KNF for servicing work.

Customer service and

repairs

Vacuum Pumps N 920 APE-W and N 920 APDC-B Technical Data

Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19 9

4. Technical Data

Pump materials

Assembly

Material

Pump head

Aluminum

Diaphragm

EPDM

Valve

EPDM

Tab. 3

Pneumatic values

Parameter

Value

Max. permissible operating

pressure [bar g]

0.5

Ultimate vacuum [mbar abs.]

< 1.5

Delivery rate [l/min]*

Tab. 4 *Liters in standard state (1013 mbar)

Pneumatic Connections

Pump type

Value

Thread size

G 1/8

Tab. 5

Electrical data

N 920 APE-W

Parameter

Value

Automatic mains power adjust-

ment

100-240V

50/60 Hz

Max. operating current [A]

1.3

Power consumption pump [W]

120

Maximum permitted mains

voltage fluctuations

+/- 10%

Protection class Motor

IP 20

Tab. 6

The pump is supplied by a universal power supply with inte-

grated overload protection. It is protected against overheating

by a temperature sensor on the motor board and equipped with

overcurrent protection.

If one of these safety functions is triggered, the pump will be

shut down and must be manually reset, as follows:

➔Separate pump from electrical power supply

➔Remove the cause(s) of the fault before restarting.

Technical Data Vacuum Pumps N 920 APE-W and N 920 APDC-B

10 Translation of original Operating and Installation Instructions, english, KNF 121690-121708 09/19

N 920 APDC-B

Parameter

Value

Motor type

Brushless DC motor

Voltage [V]

24 V

Max. operating current [A]

4.2

(starting current, momentary

200 ms: 7A)

Power consumption pump [W]

100

Maximum permitted mains

voltage fluctuations

+/- 10%

Protection class Motor

IP 00

Tab. 7

The pump is supplied by a universal power supply with inte-

grated overload protection. It is protected against overheating

by a temperature sensor on the motor board and equipped with

overcurrent protection.

If one of these safety functions is triggered, the pump will be

shut down and must be manually reset, as follows:

➔Separate pump from electrical power supply

➔Remove the cause(s) of the fault before restarting.

Weight

Pump type

Value

N 920 APE-W

10.0 kg

N 920 APDC-B

8.5 kg

Tab. 8

Other parameters

Parameter

Value

Permissible ambient tempera-

ture

+ 10°C bis + 40°C

Permissible media tempera-

ture

+ 5°C bis + 40°C

Dimensions L x H x W [mm]:

N 920 APE-W

N 920 APDC-B

324 x 182 x 127

292 x 161 x 119

Maximum permissible ambient

relative humidity

80% for temperatures up to

31°C, decreasing linearly to

50% at 40°C.

Max. altitude of site:

[m above sea level]

2000

Tab. 9

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