KNF N936 User manual

KNF 305622-306522 02/17
OEM
N 936
TRANSLATION OF ORIGINAL OPERATING AND
INSTALLATION INSTRUCTIONS
ENGLISH
DIAPHRAGM
VACUUM PUMP
Important!
Before operating the pump and the accessories, please read the operating instructions on the web site
(www.knfusa.com/downloads) and pay attention to the safety precautions!

Contents Page
1.About this document ............................................................... 3
2.Use ......................................................................................... 4
3.Safety...................................................................................... 5
4.Technical Data........................................................................ 7
5.Design and Function............................................................... 9
6.Installation and connection.................................................... 10
7.Operation.............................................................................. 15
8.Servicing............................................................................... 17
9.Troubleshooting .................................................................... 21
10.Spare parts and accessories................................................. 23
11.Returns ................................................................................. 24
12.Health and safety clearance and decontamination form........ 25
KNF Neuberger Inc.
2 Black Forest Road
Trenton, NJ 08691
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
Website: www.knfusa.com

Diaphragm Vacuum Pump N 936 About this document
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 3
1. About this document
1.1. Using the Operating and Installation Instruc-
tions
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" or "PM") may differ from the Operating and Installation In-
structions.
For project pumps, also observe the agreed upon specifica-
tions.
1.2. Symbols and markings
Warning
WARNING
A
danger warning 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
consequence.
WARNING warns of possible
danger Death or serious injuries and/or serious damage are
possible.
CAUTION warns of a possibly
dangerous situa-
tion
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 pumps

Use Diaphragm Vacuum Pump N 936
4 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
2. Use
2.1. Proper use
The pumps are exclusively intended for transferring gases and
vapors.
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
protected against rain, splash, hose and drip water.
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.
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 aggressive media. For aggressive
media there are other pumps in the KNF product program – please
ask us for detail.
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.
Operating parameters and
conditions
Requirements for
transferred medium

Diaphragm Vacuum Pump N 936 Safety
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 5
3. Safety
Note the safety precautions in chapters 6. Installation and
connection, and 7. Operation.
The pumps are built according to the generally recognized rules of
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 install and 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.
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"
chapter.
Observe the accident prevention and safety regulations when
performing any work on the pump and during operation.
When transferring dangerous media, observe the safety regula-
tions when handling these media.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the pump
compresses the medium.
Hence, make sure the temperature of the medium is sufficiently
below the ignition temperature of the medium, even when it is
compressed 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
radiation, 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
protection regulations. Observe the respective national and inter-
national 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
commissioned until such time as it has been determined that the
machine in which the partly completed machinery is to be
assembled is in conformity with the provisions of the Machinery
Personnel
Working in a safety-
conscious manner
Handling dangerous media
Handling combustible media
Environmental protection
EC Directives / Standards

Safety Diaphragm Vacuum Pump N 936
6 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
Directive 2006/42/EC. The following essential requirements of
Annex I of Directive 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.
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 (RoHS2).
The following harmonized standards have been used:
DIN EN 55014-1/2
DIN EN 62326-1 – class A
DIN EN 61000-3-2/3
DIN EN 50581
DIN EN 60204-1
EN 61010-1
IEC 61010-1
UL 61010-1
CAN/CSA-C22.2 No. 61010-1
Only have repairs to the pumps carried out by the KNF Customer
Service responsible.
Use only genuine parts from KNF for servicing work.
Customer service and
repairs

Diaphragm Vacuum Pump N 936 Technical Data
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 7
4. Technical Data
Pump materials
N 936.3
N 936.1.2
Assembly Material
Pump head Al anodized
Diaphragm HNBR
Valves HNBR
O-rings FPM
Tab. 2
Pneumatic performance
Parameter Value N 936.3 Value N 936.1.2
Max. permissible operating
pressure [bar g] 0.5 0.5
Ultimate vacuum [mbar abs.] 35 200
Delivery rate at atm. pressure
[l/min]* (50 Hz) 36 ±10% 60 ±10%
Delivery rate at atm. pressure
[l/min]* (60 Hz) 39 ±10% 66 ±10%
Tab. 3 * Liters in standard state (1013 mbar)
Electrical data
Parameter Value N 936.3 Value N 936.1.2
Voltage 100 – 120 V
and
200 – 240 V
100 – 120 V
and
200 – 240 V
Frequency 50/60 Hz 50/60 Hz
Power 0.19 kW 0.19 kW
Maximum permitted mains
voltage fluctuations +/-10% +/-10%
IP code motor IP00 IP00
Protection class I I
Voltage 100 – 120 V
Max. current consumption 2.3 A @ 50 Hz
1.8 A @ 60 Hz 2.1 A @ 50 Hz 1.9 A @ 60 Hz
Voltage 200 – 240 V
Max. current consumption 1.3 A @ 50 Hz
1.0 A @ 60 Hz 1.2 A @ 50 Hz 1.1 A @ 60 Hz
Tab. 4
The pumps are fitted as standard with a thermal-switch to protect
against overloading.
Thermal-switch

Technical Data Diaphragm Vacuum Pump N 936
8 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
Other parameters
Parameter Value
Permissible ambient temperature
(permanent) + 15 °C to + 50 °C*
Permissible media temperature
(permanent) + 5 °C to + 70 °C
Permissible media temperature
(max. 30 s) + 5 °C to + 100 °C
Pneumatic connections EU: Thread size G1/4
US: Thread size NPT 1/4
Weight 5.2 kg / 11.5 lbs
Maximum permissible ambient
relative humidity 80 % for temperatures up
to 31 °C, decreasing
linearly to 50 % at 50 °C
Max. altitude of site
[above sea level] 2000 m / 6,560 ft
Voltage 100 – 120 V
Dimensions L x H x W [in.]
(N 936.3) approx. 9.5 x 5.7 x 5.1
Dimensions L x H x W [in.]
(N 936.1.2) approx. 9.5 x 5.7 x 5.2
Voltage 200 – 240 V
Dimensions L x H x W [mm]
(N 936.3) approx. 9.2 x 5.7 x 4.8
Dimensions L x H x W [mm]
(N 936.1.2) approx. 9.2 x 5.7 x 4.9
Tab. 5 *at ambient temperature >+ 50°C during intermittent or
short-term operation, the max. surface temperature at the capacitor
must be checked when installed in the end device.
This mustn’t exceed 85°C.

Diaphragm Vacuum Pump N 936 Design and Function
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 9
5. Design and Function
Design N 936
1Fan
2Pneumatic pump inlet
3Pneumatic head connection
4Pneumatic pump outlet
5Electrical connection
Fig. 1: Diaphragm Vacuum Pump N 936.3
Function Diaphragm Pump
1Outlet valve
2Inlet valve
3Transfer chamber
4Diaphragm
5Eccentric
6 Connecting rod
7Pump drive
Fig. 2: Pump head
Diaphragm pumps transfer, compress (depending on pump ver-
sion) and evacuate gases and vapors.
The elastic diaphragm (Fig. 2/4) is moved up and down by the
eccentric (5) and the connecting rod (6). In the downward stroke it
aspirates the gas to be transferred via the inlet valve (2). In the
upward stroke, the diaphragm presses the medium out of the pump
head via the outlet valve (1). The transfer chamber (3) is hermeti-
cally separated from the pump drive (7) by the diaphragm.

Installation and connection Diaphragm Vacuum Pump N 936
10 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
6. Installation and connection
Only install and operate the pumps under the operating parameters
and conditions described in chapter 4, Technical data.
Observe the safety precautions (see chapter 3).
Take protective measures against foreign objects which could
enter the pump, because these can lead to damages to the
pump.
6.1. Installation of the pump
Before installation, store the pump at the installation location to
bring it up to ambient temperature.
For the mounting dimensions see Fig. 4, p. 11 and Fig. 5,
p. 12.
When installing the pump, ensure that no flammable objects or
objects subject to thermal deformation are located in the im-
mediate vicinity of hot pump parts (head, motor).
The pump may be installed in any position. Use metal screws
to fasten the pump at the indicated attachment points.
In order to drain off possible condensate successfully, KNF
recommends that pumps are installed in oblique position (with
the suction line in higher position than the pressure line (see
Fig. 3); for flow direction see the markings on the pump
heads).
WARNING
Danger of burns from hot surfaces
Hot surfaces may be caused by overheating of the
pump.
Install the pump so that the motor fan can intake
sufficient cooling air.
Fasten the connection cables so that:
the cables do not contact moving parts
the cables will not chafe or be damaged on sharp edg-
es or corners
no pulling or pushing forces are exerted on the cable’s
connection points (strain relief)
Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
The IP protection class of the pump motor is indicated on the
type plate.
Install the pump at the highest point in the system to prevent
condensate from collecting in the pump head.
Protect the pump from dust.
Protect the pump from exposure to fats and oils.
Protect the pump from vibrations and jolts.
Mounting dimensions
Immediate environment
Installation position
Fig. 3: Pump N 936
Cooling air supply
Attach connection cables
Installation location

Diaphragm Vacuum Pump N 936 Installation and connection
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 11
WARNING
Hazard of injuries during operation
Take protective measures against touching parts
connected to electrical power (electrical connec-
tion, possibly motor coils).
Take protective measures against touching
moving parts (e.g. fans).
The pump will restart automatically after the
automatic resetting temperature limiter has been
triggered.
Hazard of damage to the pump during operation
Take protective measures against foreign ob-
jects which could enter the pump.
Fig. 4: Mounting dimensions pump N 936.3
(All dimensional tolerances conform to DIN ISO 2768-1,
Tolerance Class V)
Protection against touching and
foreign objects

Installation and connection Diaphragm Vacuum Pump N 936
12 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
Fig. 5: Mounting dimensions pump N 936.1.2
(All dimensional tolerances conform to DIN ISO 2768-1,
Tolerance Class V)

Diaphragm Vacuum Pump N 936 Installation and connection
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 13
6.2. Electrical connection
DANGER
Extreme danger from electrical shock
Only have the pump connected by an authorized
specialist.
Only have the pump connected when the power
supply is disconnected.
When connecting the device to a power source, the relevant
standards, directives, regulations, and technical standards
must be observed.
In the electrical installation, arrangements (complying with
e.g. EN 60335-1) must be made for disconnecting the pump
motor from the electrical supply.
KNF recommends that a fuse is installed in the motor supply
circuit (overcurrent release).
For compliance with the standards EN 61010-1, IEC 61010-1, UL
61010-1 and CAN/CSA-C22.2 No. 61010-1, the supply circuit must
be provided with a delay fuse.
Voltage Frequency Fuse rating
100-120V 50/60 Hz 3.2 A T
200-240V 50/60 Hz 2.0 A T
Tab. 6
It is recommended that an additional “Emergency Stop” switch
is installed.
The pump must be installed so that contact with live parts is
impossible.
Connecting pump
1. Compare the supply data with the data on the motor-plate. For
operating current see type plate.
The voltage must not vary by more than + 10% and - 10% from
that shown on the type-plate.
2. Connect motor cables:
The pump is connected using a three-pole tab terminal (one
6.3 x 0.8-plug each for L1, N and ground).

Installation and connection Diaphragm Vacuum Pump N 936
14 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
6.3. Pneumatic connection
Only connect components to the pump which are designed for
the pneumatic data of the pump (see chapter 4, Technical da-
ta).
If the pump is used as a vacuum pump, safely discharge the
pump exhaust at the pump’s pneumatic outlet.
Connecting pump
A
marking on the pump head shows the direction of flow.
CAUTION
Personal injury or damages to property by ejected
plugs.
If the plug at the pressure side of the pump hasn’t
been removed, it could be ejected because of the
overpressure during operation.
Remove the plug during the installation.
1. Remove the protective plugs from the hose connection
threads.
2. Connect the suction line and pressure line.
Possible condensate is drained off through the pressure line;
for that reason a tank to catch the condensate must be in-
stalled in the pressure line.
Lay the suction and pressure line at a downward angle to
prevent condensate from running into the pump.
Connected
components
Pump exhaust

Diaphragm Vacuum Pump N 936 Operation
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 15
7. Operation
WARNING
Injury of the eyes
During excessive approach to the inlet or outlet of
the pump, the eyes could be injured by the upcoming
vacuum or overpressure.
Don’t look into the pump’s inlet or outlet during
the operation.
Only operate the pumps under the operating parameters and
conditions described in chapter 4, Technical data.
Make sure the pumps are used properly (see chapter 2.1).
Make sure the pumps are not used improperly (see chapter
2.2).
Observe the safety precautions (see chapter 3).
The pumps are intended for installation. Before putting them
into service it must be established that machinery or equipment
in which they are installed meets the relevant regulations.
WARNING
Personal injury during operation
Hazard of the pump head bursting due to excessive
pressure increase.
Do not exceed max. permissible operating
pressure (see chapter 4, Technical data).
Monitor pressure during operation.
If the pressure exceeds the maximum permissi-
ble operating pressure, immediately switch off
pump and eliminate fault (see chapter 9. Trou-
bleshooting).
Only throttle or regulate the air or gas quantity in
the suction line to prevent the maximum permis-
sible operating pressure from being exceeded.
If the air or gas quantity in the pressure line is
throttled or regulated, make sure that the maxi-
mum permissible operating pressure is not ex-
ceeded.
Ensure that the pump outlet is not closed or
constricted.
Excessive pressure (with all of the related hazards) can be
prevented by placing a bypass line with a pressure-relief valve
between the pressure and suctions sides of the pump. For
further information, contact our technical adviser (see last page
for telephone number).
Pump standstill

Operation Diaphragm Vacuum Pump N 936
16 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
With the pump at a standstill, open pressure and suction lines
to normal atmospheric pressure.
WARNING
A
utomatic starting can cause personal injury and
pump damage
When the operation of the pump is interrupted by the
thermal switch, the pump will restart automatically
after cooling down.
Take all necessary care to prevent this leading
to a dangerous situation.
Switching pump on
The pump may not start up against pressure or vacuum during
switch-on. This also applies in operation following a brief power
failure. If a pump starts against pressure or vacuum, it may
block. This activates the thermal switch, and the pump
switches off.
Make sure that no pressure or vacuum is present in the lines
during switch-on.
Switching pump off
KNF recommends that, at the end of an evacuation operation,
the pump should be allowed to run for a few minutes to remove
condensate from the pump heads (drying of the pump).
Open pressure and suction lines to normal atmospheric pres-
sure.

Diaphragm Vacuum Pump N 936 Servicing
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 17
8. Servicing
8.1. Servicing schedule
Component Servicing interval
Pump -Regular inspection for external dam-
age or leaks
Tube connection - Regular inspection for external dam-
age or leaks
Diaphragm and
valves and O-rings - Replace if pump's pressure or flow rate change without apparent reason
- Replace at the latest, when pump
output decreases
Tab. 7
8.2. Cleaning
When cleaning, make sure that no liquids enter the inside of
the housing.
8.2.1. Flushing pump
Flush the pump under atmospheric conditions some minutes
with air (or, if necessary for safety reasons, with an inert gas)
prior to switch-off.
8.2.2. Cleaning pump
Motor disconnected from mains and de-energized
WARNING
Health hazard due to dangerous substances
in the pump
Depending on the substance transferred, caustic
burns or poisoning are possible.
Wear protective clothing if necessary, e.g.
protective gloves.
Clean pump with suitable measures.
CAUTION
Danger of burns from hot pump parts
The pump head or motor may be hot even after the
pump has been shut off.
Allow the pump to cool off after operation.
As far as possible, clean the parts with a dry cloth. Solvents
should not be used as they can attack the plastics, and syn-
thetic rubber parts.
If compressed air is available, blow out the components.
Conditions

Servicing Diaphragm Vacuum Pump N 936
18 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
8.3. Replacing diaphragm, valves and O-rings
Motor disconnected from mains and de-energized
Pump is clean and free of dangerous substances
Tubes removed from pump’s pneumatic inlet and outlet
CAUTION
Danger of burns from hot pump parts
The pump head or motor may be hot even after the
pump has been shut off.
Allow the pump to cool off after operation.
Always replace diaphragm, valves and O-rings together to
maintain the performance and safety of the pump.
WARNING
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
burns or poisoning are possible.
Wear protective clothing if necessary, e.g.
protective gloves.
Clean pump with suitable measures.
Spare part* Position** Quantity
Diaphragm (17) 2
Valve (14) 4
O-ring valve (13) 4
O-ring connection
(N 936.3) (19) 2
O-ring connection
(N 936.1.2) (19) 4
O-ring below diaphragm (18) 2
Screw for retainer plate (15) 2
Tab. 8 * according to Spare parts list, chapter 10
** according to Fig. 7
Qty. Tools/material
1 Torx TX30 screwdriver
1 Torx TX25 screwdriver
1 Felt-tip pen
Tab. 9 * according to accessories list, chapter 10
Conditions
Spare parts
Tools and material

Diaphragm Vacuum Pump N 936 Servicing
Translation of original Operating Instructions, English, KNF 305622-306522 01/17 19
Remove pump head
1. At both pump heads:
Mark the position of head plate (Fig. 6/12), intermediate plate
(8) and pump housing (9) relative to each other by a drawing
line (M) with a felt-tip pen. This helps avoid incorrect assembly
later.
2. At both pump heads:
Undo the four screws (7) in the head plate.
3. Remove both pump heads (each consisting of a head plate
(12) and intermediate plate (8)) together from the pump hous-
ing (9).
N 936.3:
The connecting tube should remain in place.
N 936.1.2:
The connecting tubes should remain in place.
Change diaphragm
1. Turn the fan (Fig. 6/10) to bring one diaphragm (Fig. 7/17) to
top dead centre.
2. Unscrew the screw for retainer plate (Fig. 7/15), and take off
the retainer plate (16).
3. Remove diaphragm (Fig. 7/17) from reception.
4. Check that all parts are free from dirt and clean them if neces-
sary (see chapter 8.2.2).
5. Turn the fan (Fig. 6/10) until the connecting rod (connecting
part between motor shaft and diaphragm) is at top dead cen-
tre.
6. Replace the O-ring below the retainer plate (Fig. 7/18) with a
new one.
7. Lay in the new diaphragm (Fig. 7/17); then apply the retainer
plate (16) and tighten it to the connecting rod with the screw for
retainer plate (15) (tightening torque: 9 Nm).
The self-locking screw for retainer plate (15) can only be used
once.
8. Carry out steps 1 to 7 for the second pump head.
Change valves and O-rings
1. Pull the connecting tube(s) (Fig. 7/11) out of one of the two
head
plates (12).
2. Separate the head plate (Fig. 7/12) from the intermediate plate
(8).
3. Remove the valves (Fig. 7/14) and O-rings (13) from the inter-
mediate plate (8).
4. Check that the valve seats, the head plate and intermediate
plate are clean; if scratches or distortion are evident on these
parts they should be replaced.
Fig. 6: Pump N 936.3
Fig. 7: Pump head (exploded
drawing, symbolic)

Servicing Diaphragm Vacuum Pump N 936
20 Translation of original Operating Instructions, English, KNF 305622-306522 01/17
5. Lay in valves and O-rings:
The valves and O-rings for suction and pressure sides are
identical, as are upper and lower sides of the valves and O-
rings.
Lay the new valves (Fig. 7/14) and O-rings (13) in the recesses
in the intermediate plate (8).
6. Place the head plate (Fig. 7/12) on the intermediate plate (8),
in the position indicated by the marking (Fig. 6/M).
7. Check that the head plate (Fig. 7/12) is centered by moving it
gently sideways.
8. Carry out steps 2 to 7 for the second pump head.
9. Dispose of the old diaphragm, valves and O-rings properly.
Refit pump heads
1. Push the connecting tube(s) (Fig. 7/11)into the hole in the
head plate (12).
Ensure that the O-rings (19)lie in the grooves of the connect-
ing tube(s). Note: O-rings only present on straight-threaded
connections, not NPT.
2. Place the two pump heads that are joined by the connecting
tube(s) (Fig. 7/11)on the housing according to the markings
(Fig. 6/M).
3. On both pump heads:
Gently tighten the screws (Fig. 7/7) , evenly and diagonally.
4. Turn the fan (Fig. 7/10) to check that the pump rotates freely.
5. Now tighten at both pump heads screws (Fig. 7/7) diagonally
(tightening torque: 6 Nm).
Final steps
1. Reconnect suction and pressure line to the pump.
2. Reconnect the pump to the electricity supply.
If you have any questions about servicing call out technical adviser
(see last page for contact telephone number).