KNF UN 828 Bedienungsanleitung

KNF 04/2022

OEM

828

838

TRANSLATION

ORIGINAL

OPERATING

AND

INSTALLATION

INSTRUCTIONS

MINI DIAPHRAGM

VACUUM PUMPS

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 13

6. .... Installation and connection 18

7. ............................... Operation 32

8. ................................ Servicing 39

9. ..................... Troubleshooting 51

10.Spare parts and accessories 54

11. ................................ Returns 55

KNF Inc

2 Black Forest Rd

Trenton, NJ 08691

Phone +1(609) 890-8600

http://www.knf.com/

Diaphragm Vacuum Pump N 828 / N 838 About this document

Original-Operating and Installation Instructions, English, KNF 121249-121517 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.

 Pass on the Operating and Installation Instructions to the next

owner.

Customer-specific project pumps (pump models which begin with

“PJ”, “PM”, “PU” or “MPU”) may differ from the Operating and In-

stallation Instructions.

 For project pumps, observe the agreed upon specifications.

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 Diaphragm Vacuum Pump N 828 / N 838

4 Translation of original Operating and Installation Instructions, English, KNF 121249-121517 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 pump head, diaphragm and valves with the medium.

Only transfer gases which remain stable under the pressures and

temperatures occurring in the pump.

Operating parameter and

conditions

Requirements for

transferred medium

Diaphragm Vacuum Pump N 828 / N 838 Use

Translation of original Operating and Installation Instructions, English, KNF 121249-121517 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.

The pumps are not suitable for transferring liquids.

The pumps are not suitable for transferring aerosol.

The pumps are not suitable for transferring biological and microbio-

logical substances.

The pumps are not suitable for transferring fuel.

The pumps are not suitable for transferring explosive and combus-

tible materials.

The pumps are not suitable for transferring fibers.

The pumps are not suitable for transferring oxidizing agent.

The pumps are not suitable for transferring 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 Diaphragm Vacuum Pump N 828 / N 838

6 Translation of original Operating and Installation Instructions, English, KNF 121249-121517 09/19

3. Safety

Note the safety precautions in Chapter 6. Installation and con-

nection and 7. 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.

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

gized.

The pump heads heat up during operation – avoid contact with

them.

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

Handling dangerous media

Handling combustible media

Diaphragm Vacuum Pump N 828 / N 838 Safety

Translation of original Operating and Installation Instructions, English, KNF 121249-121517 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.

For pumps with AC motor:

When the operation of the pump is interrupted by the thermal

switch, the pump will re-start automatically after cooling down.

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

ation.

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 pumps with AC motor)

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.

Thermal switch

Environmental protection

EU/EC Directives / Standards

Safety Diaphragm Vacuum Pump N 828 / N 838

8 Translation of original Operating and Installation Instructions, English, KNF 121249-121517 09/19

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

The following harmonized standards have been used:

UN 828 _NI

UN 838 _NI

UN 838.1.2 KNI

UN 828 _NDC

UN 838 _NDC

UN 828 KNDC-B

UN 828 KN.29DC-B

UN 838 KNDC-B

UN 838 KN.29DC-B

UN 838.1.2 KNDC-B

UN 838.1.2 KN.29DC-B

DIN EN 55014-1/2 DIN EN 55014-1/2 DIN EN 61000-6-2/3

DIN EN 61000-3-2/3 DIN EN 60034-1 DIN EN 50581

DIN EN 60335-1 DIN EN 61000-6-1/2

DIN EN 50581 DIN EN 50581

Tab. 2

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

Diaphragm Vacuum Pump N 828 / N 838 Technical Data

Translation of original Operating and Installation Instructions, English, KNF 121249-121517 09/19 9

4. Technical Data

Pump material

Assembly UN 828 AN_

UN 838 AN_

UN 828 KN_

UN 838 KN_

UN 838.1.2 KNE

UN 838.1.2 KNDC-B

UN 838.1.2 KN.29DC-B

Pump head Aluminum PPS

Diaphragm EPDM EPDM

Valve FPM FPM

Tab. 3

Pneumatic Values

Pumps with AC motor

Parameter UN 828 ANI

UN 828 KNI

UN 838 ANI

UN 838 KNI

UN 838.1.2 KNI

Max. permissible operating pressure

[bar g / psig]

1.0 / 14.5 0.5 / 7.3 0.5 / 7.3

Ultimate vacuum

[mbar abs.]

100 100 90

Flow rate at atm. pressure [l/min]* 28 34 42

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

Pumps with DC motor

Parameter UN 828 ANDC

UN 828 KNDC

UN 838 ANDC

UN 838 KNDC

Max. permissible operating pressure [bar g / psig] 1.0 / 14.5 0.5 / 7.3

Ultimate vacuum

[mbar abs.]

100 100

Flow rate at atm. pressure [l/min]* 27 32

Tab. 5 *Liters in standard state (1013 mbar)

Pumps with brushless DC motor

Parameter UN 828 KNDC-B

UN 828 KN.29DC-B

UN 838 KNDC-B

UN 838 KN.29DC-B

UN 838.1.2 KNDC-B

UN 838.1.2 KN.29DC-B

Max. permissible op-

erating pressure [bar

g / psig]

1.0 / 14.5 0.5 / 7.3 0.5 / 7.3

Ultimate vacuum at

nominal speed

[mbar abs.]

100 100 100

Flow rate at atm.

Pressure and nomi-

nal speed [l/min]*

28 34 60

Flow rate at atm.

Pressure and 0.1V

control voltage (only

.29-version) [l/min]*

6 8.5 12

Tab. 6 *Liters in standard state (1013 mbar)

Pneumatic connections

Pump type Value

Technical Data Diaphragm Vacuum Pump N 828 / N 838

10 Translation of original Operating and Installation Instructions, English, KNF 121249-121517 09/19

UN 828 AN_ / UN 828 KN_

UN 838 AN_ / UN 838 KN_

UN 838.1.2 KNI

UN 838.1.2 KNDC-B /

UN 838.1.2 KN.29DC-B

Thread size G 1/8 or 1/8 NPT

Tab. 7

Electrical Parameter

Pumps with AC motor, Pumps with DC motor

Parameter Value

Voltage / Frequencies

See Label on Pump Max. operating current

Pump power consumption

Motor protection class:

UN 828 AN_ / UN 828 KN_ / UN 838 AN_ / UN 838 KN_ IP 00

Motor protection class:

UN 838.1.2 KNI IP 20

Maximum permissible mains voltage fluctuations ± 10%

Tab. 8

Pumps with brushless DC motor

Parameter UN 828 KNDC-B

UN 828 KN.29DC-B

UN 838 KNDC-B

UN 838 KN.29DC-B

UN 838.1.2 KNDC-B

UN 838.1.2 KN.29DC-B

Voltage [V] 24 24 24

Control voltage

(only .29 version)

[V]

0.1…5* 0.1…5* 0.1…5*

Max. operating

current [A]:

- for p > patm.

- for p < patm.

2.4

2.0

2.4

2.2

4.2

3.9

Starting current The starting current can be up to 50% above the maximum operating

current.

Starting ramp [ms] 800 800 800

Max. power con-

sumption of the

pump [W]:

- for p > patm.

- for p < patm.

57.6

48.0

57.6

52.8

100.8

93.6

Maximum permis-

sible mains volt-

age fluctuations

± 10% ± 10% ± 10%

Motor protection

class

IP 20 IP 20 IP 20

Overcurrent limita-

tion of the motor

electronics [A]

7.5 7.5 7.5

Tab. 9 *further control voltage versions on demand

For pumps with AC motor:

The pumps are fitted with a thermal switch to protect against

overloading.

Thermal switch

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