Richter RMA Series User manual

INSTALLATION AND OPERATING MANUAL
Translation of the original manual
Keep for future use!
This operating manual must be strictly observed before
transport, installation, operation and maintenance
Subject to change without notice.
Reproduction is generally permitted with indication of the source.
© Richter Chemie-Technik GmbH
9450-055-en Revision 01Edition 11/2018
Series RMA-B
Sealless Chemical
Magnetic Drive Pump
Close-coupled design

Series RMA-B close-coupled design Page 2
9450-055-en Revision 01
TM 9886 Edition 11/2018
List of Contents
List of Contents.................................................2
Relevant documents.........................................3
1Technical data .............................................3
1.1 Tightening torques .......................................... 4
1.2 Type plate, dry-running, ATEX and housing
markings ........................................................... 4
1.3 Spareparts........................................................ 4
2Safety ............................................................5
2.1 Intended use .................................................... 5
2.2 Notes on safety for the customer / operator 6
2.3 Notes on safety for maintenance .................. 6
2.4 Conversion work and production of spare
parts by the customer ..................................... 6
2.5 Improper operation.......................................... 6
2.6 Special requirements for explosion protection
....................................................................... 6
2.6.1 Filling the unit ........................................................7
2.6.2 Special operating conditions ...............................7
2.6.3 Chargeable liquids................................................7
2.6.4 Identification ..........................................................7
2.6.5 Check of the direction of rotation........................7
2.6.6 Mode of operation of the pump...........................7
2.6.7 Temperature limits................................................8
2.6.8 Maintenance..........................................................8
2.6.9 Electric peripheral equipment..............................8
3Transport, storage and disposal ...............9
3.1 Return consignments...................................... 9
3.2 Disposal ............................................................ 9
4Product description ..................................10
5Installation..................................................11
5.1 Safety regulations.......................................... 11
5.2 Installation of pump/unit ............................... 11
5.3 Alignment of pump - motor........................... 11
5.4 Piping .............................................................. 11
5.4.1 Nominal size........................................................11
5.4.2 Nozzle loads ........................................................12
5.4.3 Suction line ..........................................................12
5.4.4 Supply lines .........................................................12
5.4.5 Discharge line......................................................12
5.4.6 Venting and evacuating .....................................12
5.5 Pipe fittings..................................................... 12
5.6 Monitoring facilities........................................ 13
5.7 Drive ................................................................ 13
5.8 Electric connection ........................................ 13
6Commissioning/Shutdown ...................... 14
6.1 Initial commissioning .....................................14
6.1.1 Filling the pump housing ................................... 14
6.1.2 Start-up................................................................ 14
6.2 Operating limits ..............................................14
6.2.1 Abrasive media................................................... 14
6.2.2 Min./max. flow rate............................................. 14
6.3 Shutdown ........................................................15
6.4 Restarting........................................................15
6.5 Improper operations and their consequences
(examples) ......................................................15
7Maintenance .............................................. 16
7.1 Safety-relevant screw fittings.......................16
7.2 Motor................................................................16
7.3 Cleaning ..........................................................16
7.4 Stand-by pumps.............................................16
7.5 Notes on dismantling.....................................16
7.5.1 Protective clothing.............................................. 16
7.5.2 Magnetic fields.................................................... 16
7.5.3 Changing the motor ........................................... 16
7.6 Dismantling .....................................................17
7.6.1 Removing adapter............................................. 17
7.6.2Dismantling motor, adapter and drive magnet
assembly ............................................................. 17
7.6.3 Dismantling slide-in unit .................................... 17
7.6.4 Dismantling housing/shaft spider..................... 18
7.7 Notes on assembly........................................18
7.7.1 Table for target dimension Z............................. 19
7.8 Assembly.........................................................20
7.8.1 Assembly of housing / shaft spider .................. 20
7.8.2 Assembly of slide-in unit ................................... 20
7.8.3 Assembly of drive unit ....................................... 20
7.8.4 Final assembly.................................................... 21
7.9 Tests................................................................21
8Malfunctions.............................................. 22
9Sectional drawing ..................................... 23
9.1 Legend ............................................................23
9.2 RMA-B close-coupled design (NEMA motor)
......................................................................24
10 Assembly aids........................................... 25
10.1 Boring template for housing drain ...............25
10.2 Pull-off device for plain bearing bushes .....25
10.3 Dismantling device impeller-inner magnet
assembly.........................................................25
10.4 Insertion tool for shaft spider........................26

Series RMA-B close-coupled design Page 3
9450-055-en Revision 01
TM 9886 Edition 11/2018
Relevant documents
♦Data sheet
♦Works certificate
♦Sectional drawing
RMA-B close-coupled design 9450-00-3002
♦Installation drawing
♦Performance curves
♦Spare parts list
♦Operating manual and declaration of conformity
motor
Appendix to the operating manual
♦Operational limits 9450-00-3030
♦Declaration of conformity with ATEX
♦Declaration of conformity without ATEX
♦Form for Safety Information Concerning the
Contamination QM 0912-16-2001_en
On request:
♦Magnetic drive data Richter TIS 0543-03-0001
♦Publication: "Centrifugal Pump Operation without
NSPH Problems"
♦Publication "Safe Operation of Magnetic Drive
Pumps“
1 Technical data
Manufacturer :
Richter Chemie-Technik GmbH
Otto-Schott-Str. 2
D-47906 Kempen
Telephone: [phone]
Fax: [phone]
E-Mail: [e-mail]
Internet: http://www.richter-ct.com
Richter EP (Nanjing) Co., LTd.
No. 18 Ailing Rd., Moling,
Jiangning Dev. Zone
211111 Nanjing
P.R. China
Telephone: +86 (0) 25 / 5275 1718
Fax: +86 (0) 25 / 5275 1747
E-Mail: [e-mail]
Internet: http://www.richter-ct.com
Authorised person acc. to machine directive
2006/42/EG: Gregor Kleining
Designation :
Single-stage, plastic-lined, magnetic drive chemical
centrifugal pump, series RMA-B, close-coupled design
Horizontal design, sealless, free of eddy currents
Technical specifications ASME B73.1, ASME B73.3,
ISO 15783, ISO 5199 and HI standards .
Connecting dimensions to ASME B73.3
Flange connecting dimensions:
ASME B16.5 Class 150
ATEX Directive 2014/34/EU
Machine Directive 2006/42/EC
Materials :
Pressurized parts:
Ductile cast iron ASTM A 395 / EN-JS 1049
Wetted parts:
PFA, PTFE, SsiC and see data sheet.
Flow rate : up to 790 USgpm (180m3/h)
(at 3500 rpm)
Delivery head : up to 525 ft (160m) (at 3500 rpm)
Housing discharge pressure :
max. 275psi (19 bar)
Temperature range :
Operating conditions to standard
ASME
ISO
–20 °F (–29 °C) up to
302 °F (150 °C)
–60 °C (–76 °F) up to
150 °C (302 °F)
Temperature classes as per ATEX :
see Chapter 2.6.7.
Admissible ambient conditions for pumps acc. to
directive 2014/34/EU (ATEX) :
Ambient temperature range: 4 °F bis 104 °F,
– 20 °C bis + 40 °C (higher temperature after
consulting the manufacturer)
Ambient pressure range: 11,6 psia – 16 psia
0,8 barabs – 1,1 barabs
Noise capacity level : LWA = ≤ 70 dB acc. to
DIN EN ISO 9614-2
Sizes :
Group 1 Group 2
1,5"x1"x6"
3"x1,5"x8"
3"x1,5"x6"
3"x2"x8"
3"x2"x6"
4"x3"x8"
1,5"x1"x8"
3"x2"x10"
4"x3"x10"H
6"x4"x10"
Weight : See data sheet
Dimensions : See installation drawing

Series RMA-B close-coupled design Page 4
9450-055-en Revision 01
TM 9886 Edition 11/2018
1.1 Tightening torques
Screws greased, tighten in diametrically opposite
sequence
Housing screws 901/3
Size
No. x size
Tightening torque
[inch]
[ASME]
[in-lbs]
[Nm]
1,5"x1"x6"
8 x ½“
415
47
3"x1,5"x6"
8 x ½“
415
47
3"x2"x6"
8 x ½“
415
47
1,5"x1"x8"
10 x ½“
390
44
3"x1,5"x8"
12 x ½“
415
47
3"x2"x8"
12 x ½“
415
47
4"x3"x8"
12 x ½“
415
47
3"x2"x10"
12 x
5
/
8
“
743
84
4"x3"x10"H
12 x
5
/
8
“
743
84
6"x4"x10"
12 x
5
/8“
743
84
Pipe screws, flanges to ASME B16.5 Class 150
DN No. x size Tightening
torque
[inch]
[ASME]
[in-lbs]
[Nm]
1“
4 x ½“
70
8
1½“
4 x ½“
135
15
2“
4 x 5/8“
220
25
3“
4 x 5/8“
400
45
4“
8 x 5/8“
310
35
6“
8 x
5
/
8
“
310
35
1.2 Type plate, dry-running, ATEX and
housing markings
The stainless steel type plate is undetachably riveted
to the adapter.
If the operator attaches his identification, it must be
ensured that the pump matches the application in
question.
Example of type plate:
Dry-running:
ATEX marking:
Housing identification:
The following are visible on the housing according to
DIN EN 19:
♦Nominal size
♦Rated pressure
♦Housing material
♦Manufacturer's identification
♦Melt number/Foundry identification
♦Cast date
1.3 Spareparts
Spare parts for two years of continuous operation in
accordance with DIN 24296 and in consultation with
the manufacturer

Series RMA-B close-coupled design Page 5
9450-055-en Revision 01
TM 9886 Edition 11/2018
2 Safety
This operating manual contains fundamental
information which is to be observed during installation,
operation and maintenance.
It must be read before installation and
commissioning!
This operating manual must always be available at the
place of use of the machine/plant.
Observe the safety notes in all the chapters.
Installation, operation and maintenance are to be
performed by qualified staff.
The area of responsibility, authority and supervision of
the staff must be exactly regulated by the customer.
If the staff does not have the necessary expertise,
they are to be trained and instructed.
If necessary, this can be provided by the
manufacturer/supplier on behalf of the machine
operator.
General hazard symbol! People may be put
at risk.
Safety symbol! The pump and its function
may be put at risk if this safety symbol is not
observed.
EU marking! Explosion-protected equip-
ment must be identified for work in
potentially explosive areas.
Warning of a magnetic field!
Warning of electric power!
This warning sign must be used if people
with a pacemaker are at risk, e.g. from a
strong magnetic field.
It is imperative to observe signs attached directly to
the pump / unit, e.g.:
♦Direction of rotation arrow
♦Warning against dry-running
and they are to be kept legible.
Non-observance of the notes on safety may result
in the loss of any and all claims for damages.
Non-observance may involve the following hazards :
♦Failure of important functions of the machine/plant.
♦Failure of electronic equipment and measuring
instruments due to magnetic fields.
♦Risk to people and their personal property from
magnetic fields.
♦Risk to people from electric, mechanical and
chemical effects.
♦Risks to the environment through leaks of
hazardous substances.
If the unit is used in potentially explosive areas,
special attention is to be paid to the sections
identified with “Ex” in this operating manual.
2.1 Intended use
Richter pumps of the series RMA-B are plastic-lined
magnetic drive centrifugal pumps for the leak-free
conveyance of aggressive, toxic, pure and
inflammable liquids.The pump is equipped with a
permanent magnetic synchronous drive.
♦Only operate the pump / the unit in a technically
perfect condition.
♦Only use the pump with the media described in the
data sheet.
For vertical installation of the pump, please consult
the manufacturer.
The observance of the specified physical limits is
important for perfect functioning and safe operation,
especially with regard to explosion protection to
prevent potential sources of ignition (see Chapter
2.6):
♦Avoid dry running.
♦Make sure that the pump is only operated with a
medium and not without one.
♦For safe pump operation, we recommend a flow
rate which lies between 0.3 and 1.1 Qopt. The
maximum operating temperature must never be
exceeded. See Chapter 2.6.7. In case of doubt,
you must consult the manufacturer.
♦The manufacturer must be consulted in the event
of entrainment of gas >2% as well as solids in
order to avoid a lack of lubrication and dry-running.
♦The plant NPSH value (NPSHA) should be 0.5 m
higher than the NPSH value of the pump
(NPSHR). See also Chapter 5.4.1.
Improper operation, even for brief periods,
may result in serious damage to the unit.
In connection with explosion protection,
potential sources of ignition (overheating, electrostatic
and induced charges, mechanical and electric sparks)
can result from these inadmissible modes of
operation; their occurrence can only be prevented by
adhering to the intended use.

Series RMA-B close-coupled design Page 6
9450-055-en Revision 01
TM 9886 Edition 11/2018
Furthermore, reference is made in this connection to
the Directive 95/C332/06 (ATEX 118a) which contains
the minimum regulations for improving the
occupational health and safety of the workers who
may be at risk from an explosive atmosphere.
Do not operate the unit above the values
specified in the data sheet for the
♦fluid
♦flow rate
♦speed
♦density
♦head
♦operating temperature and
♦motor rating
Observe the instructions contained in the
operating manual or contractual documentation; if
necessary, consult the manufacturer.
All important features are documented in the data
sheet included in the scope of delivery.
In the event of operating conditions other than those
described in the data sheet, the following are to be
checked again:
♦design of the pump
♦design of the accessories
♦resistance of the materials.
2.2 Notes on safety for the customer /
operator
The following must be observed:
♦The notes on safety contained in this operating
manual,
♦the prevailing regulations on accident prevention,
♦in-house work, operating and safety regulations of
the customer.
♦Protect hot, cold or moving machine parts from
being touched on site.
♦Do not remove any protective facilities when the
machine is in operation.
♦Exclude any risks from electricity.
♦Remove leaks of hazardous media (e.g. explosive,
toxic, hot) so that there is no risk to people and the
environment. Observe statutory regulations.
♦Provide and use protective equipment for the staff.
Caution when using the units in potentially
explosive area!
Prevent inadmissible modes of operation.
2.3 Notes on safety for maintenance
♦Strictly, work on the pump/unit may only be
performed when it is at a standstill.
♦The pump housing must have reached ambient
temperature.
♦The pump housing must be depressurized and
drained.
♦It is imperative to observe the procedure for
stopping the machine described in this operating
manual. See also Chapter 6.3.
♦Decontaminate pumps which convey media
hazardous to health.
♦Immediately after completion of the work, re-install
all safety and protective facilities or put them into
operation again.
♦When installed, the magnetic drives do not
represent any risk of environmental impact if the
notes on safety are observed (see also Chapter
5.1 and 7.5.2).
It is imperative to observe the notes on
safety in Chapter 7.5.2 during dismantling
and assembly as well as during transport
and storage of magnetic drives as single
components.
♦Observe the points listed in Chapter 6.1 prior to
recommissioning.
2.4 Conversion work and production
of spare parts by the customer
♦Conversion of or changes to the machine are only
admissible after consultation with the
manufacturer.
♦Only use original spare parts or parts approved by
the manufacturer.
♦The use of other parts may annul the liability for
any resultant consequences.
2.5 Improper operation
♦The operational safety of the machine supplied is
only guaranteed if it is used properly in accordance
with Chapter 2.1 of this operating manual.
♦The operating limits specified in the data sheet
must under no circumstances be exceeded.
2.6 Special requirements for explosion
protection
If the units are used in potentially explosive areas, the
measures and notes in Chapter 2.6.1 to 2.6.9 are
imperative to observe the explosion protection.

Series RMA-B close-coupled design Page 7
9450-055-en Revision 01
TM 9886 Edition 11/2018
2.6.1 Filling the unit
During pump operation the wetted interior of
the pump must always be filled with the liquid
medium.
This prevents any explosive atmosphere and the risk
of dry-running.
If the customer cannot ensure this, we
recommend that appropriate monitoring
facilities be provided.
Also carefully fill auxiliary, heating and cooling
systems.
2.6.2 Special operating conditions
In the standard design the can chamber and the plain
bearings are cooled and lubricated by a flushing flow.
Owing to properties of the medium (e.g. sticking due
to inadmissible solids entrainment, clogging, gas
entrainment etc.) the cooling flow can be interrupted
and, as a result, an inadmissible temperature rise may
occur. Provide appropriate monitoring facilities. See
Chapter 5.6.
For safe pump operation, we recommend a flow rate
of 0.3 to 1.1 Qopt. If the pump is operated outside this
range, it must be ensured that the max. admissible
flow rate according to the pump characteristic curve is
not exceeded and that the max. admissible operating
temperature according to Chapter 2.6.7 is observed.
If the flow rate is too high, the differential pressure
upstream and downstream of the plain bearings could
fall so much that a lack of lubrication or dry-running
may occur.
If the flow rate is too low, the medium may heat up so
much owing to the fluid friction that the max.
admissible surface temperature of the relevant
temperature class is exceeded.
Overloading, overheating, non-observance of the
design data or the incorrect selection of the magnetic
drive can lead to the decoupling of the inner and outer
magnet assemblies. As a result, eddy currents may be
induced on the inner and outer magnet assemblies
and an inadmissible temperature rise may occur.
The situation is to be remedied by providing
appropriate monitoring facilities. See Chapter 5.6.
The plant NPSH value (NPSHA) should be minimum
0.5 m higher than the NPSH value of the pump
(NPSHR) to prevent a lack of lubrication or dry-
running of the plain bearings.
2.6.3 Chargeable liquids
For operation with chargeable liquids with a
conductivity < 10-8 S/m inert gas must be used
for flushing during drain. See also Chapter
6.3.
2.6.4 Identification
The identification on the pump relates to the
pump section. A separate declaration of
conformity must be provided for the shaft
coupling and motor and for other attachments as well
as corresponding identification.
Example of the identification of the pump section:
II2GD IIC TX X.
For assembling the pump with components which are
not explosion-protected (e.g. motor, shaft coupling), it
is recommended to mask or remove the "potentially
explosive" identification from the pump component
and, if necessary, from other accessories.
In this case the declaration of conformity applies
without ATEX identification.
At surface temperatures which depend primarily on
operating conditions, DIN EN 13463-1 Chapter 9.3
allows no temperature class or temperature to be
indicated.
The temperature class must be determined by the
operator in accordance with Chapter 2.6.7
“Temperature Limits”.
2.6.5 Check of the direction of rotation
If there is also a risk of explosion during the
installation phase, the check of the direction
of rotation must under no circumstances be
conducted by briefly switching on the unfilled pump in
order to prevent an inadmissible rise in temperature at
the plain bearings.
We recommend you to only perform a check of the
direction of rotation with with filled pump and with a
rotating field instrument. See also Chapter 6.1.2.
2.6.6 Mode of operation of the pump
The pump may only be started with the suction side
shut-off element fully opened and the discharge side
shut-off element slightly opened. Start-up against a
closed check valve is also possible. The discharge
side shut-off element is to be regulated to the
operating design point directly after run-up.
See also Chapter 5.4.1.
Operation with closed shut-off elements in the
suction and/or discharge lines is not permitted!
There is a risk that even after a short time
high surface temperatures on the pump
housing may occur owing to rapid heating of
the liquid in the pump interior.
A rapid rise in the pressure inside the pump
involves the risk of overloading to the point of
bursting.
The pump must not be in operation in the
unfilled or partially filled state (dry
running). This results in serious damage
to the pump and additional risks to the
environment can arise.

Series RMA-B close-coupled design Page 8
9450-055-en Revision 01
TM 9886 Edition 11/2018
Dry-running cannot only occur with an
insufficiently filled interior but also in the event
of high gas contents in the liquid medium.
Operation of the pump outside the admissible
operating range may also lead to dry-running (e.g.
due to evaporation in the interior).
2.6.7 Temperature limits
In the normal operating condition the highest
temperatures are to be expected on the
surface of the pump housing.
In the case of liquids >40 °C (>104 °F) the surface
temperature of the pump housing is generally lower
than the temperature of the liquid as the plastic lining
has an insulating effect.
If the pump is heated (e.g. heating jacket), it
must be ensured that the temperature
classes prescribed in the annex are
observed.
The non heated pump surface must have free contact
with the environment.
When operating the pump, make sure that
an excessive deposit of dust is avoided
(possibly regular cleaning). This prevents the
pump surface from heating to above the admissible
temperature.
The plant customer must ensure that the
prescribed operating temperature is observed.
The maximum admissible temperature of the
liquid medium at the pump inlet depends on the
temperature class and the selected lining material
required in each case.
The principle always applies that no inadmissible
temperatures may be introduced into the motor and
that the specifications of the motor manufacturer as
well as VDMA/TVEI 24263 are to be observed.
The temperature limit values of the liquid medium
given in Table 2 are only applicable if motors are used
where the motor manufacturer permits at least the
following surface temperatures for the motor flange
and shaft:
Table 1
Temperature
class Motor flange Motor shaft
T6
70 °C(158 °F)
70 °C(158 °F)
T5
70 °C(158 °F)
80 °C(176 °F)
T4
75 °C(167 °F)
85 °C(185 °F)
T3
75 °C(176 °F)
85 °C(212 °F)
T2
75 °C(176 °F)
85 °C(212 °F)
T1
75 °C(176 °F)
85 °C(212 °F)
Observe the figures of the motor manufacturers and
VDMA/ZVEI 24263 on inadmissible ambient
temperatures. If these values are missing, max. 40° C
(104 °F) is to be assumed.
Table 2 below indicates the admissible medium
temperature, depending on the pump design, as a
function of the temperature class in accordance with
EN 13463-1.
Table 2
Temperature class acc.
to EN 13463-1
Limit value of the
temperature of the liquid
PFA
T6
85 °C (185 °F)
75 °C
1)
(167 °F)
T5
100 °C (212 °F)
90 °C
1)
(194 °F)
T4135 °C (275 °F)
125 °C (257 °F)
T3200 °C (392 °F)
150 °C (302 °F)
T2300 °C (572 °F)
150 °C (302 °F)
T1450 °C (842 °F)
150 °C (302 °F)
1) The limit values specified for the temperature of the medium at the
pump inlet are determined for the most unfavourable case (high
speed, low flow, low heat capacity of the medium, ....). Under
favourable operating conditions the limit values specified may be
increased by up to 5 K after consultation with the manufacturer.
In the case of motors with the ignition protection class
"increased safety", only low surface temperatures are
generally admissible on the motor shaft and on the
motor flange.
In such cases, the max. admissible medium
temperature lies 20 K above the permitted surface
temperature at the interfaces to the motor.
e.g.: max. motor shaft temperature: 60 °C (140 °F)
max. motor flange temperature: 65 °C (149 °F)
This results in an admissible medium temperature at
the pump of von 80 °C (60 °C + 20 K), .176 °F (140 °F
+ 20 K).
If values on the admissible ambient temperature are
missing, max. 40 °C is always to be assumed.
2.6.8 Maintenance
To achieve safe and reliable operation, it
must be ensured in inspections at regular
intervals that the unit is properly serviced
and kept in technically perfect order.
In regard to media containing solids, the maintenance
intervals must be set by the operator in accordance
with the conditions of operation.
If auxiliary systems (e.g. cooling, heating) are
installed, check to see whether monitoring facilities
are required to ensure their function.
2.6.9 Electric peripheral equipment
Electric peripheral equipment, e.g. pressure,
temperature and flow sensors etc. must
comply with the prevailing safety requirements
and explosion protection provisions.
Regular checks of the motor bearings in accordance
with the operating manual of the motor manufacturer.
Observe ATEX notes.

Series RMA-B close-coupled design Page 9
9450-055-en Revision 01
TM 9886 Edition 11/2018
3 Transport, storage and disposal
The pump or the unit must be transported
properly. It must be ensured that during
transport the pump/unit remains in the
horizontal position and does not slip out of the
transport suspension points.
A pump or motor can be suspended from the ring bolt
provided for this purpose.
The suspension points are not suitable for
transporting a complete unit, i.e. pump with base
plate and motor.
In this case, the slinging points for the ropes on the
base plate are to be used. See Fig. 1.
Exception:
The base plate 10.63 x 19.69 inch (270 x 500 mm)
for pumps in group 1 does not have any slinging
points for the ropes. In this case, the unit (pump,
motor and base plate) is suspended to the crane
eyelets of pump and motor.
The slinging ropes must not be attached to free shaft
ends or to the ring bolt of the motor.
Fig. 1
Directly after receipt of the goods, the
consignment must be checked for completeness
and any in-transit damage.
Damaged pumps must not be installed in the plant.
When unpacking magnetic drives as single
parts, the relevant notes in Chapter 7.5.2
must be observed.
Handle goods carefully to prevent damage.
Flange covers serve as protection during transport
and must not be removed.
If the unit is not installed immediately after delivery, it
must be put into proper storage.
The product should be stored in a dry and vibration-
free, well ventilated room at as constant a
temperature as possible.
Elastomers are to be protected against UV light.
In general, a storage period of 10 years should not be
exceeded. An admissible storage period of 4 years
applies to elastomers made of NBR.
If magnetic drives are stored as single
parts, the relevant notes in Chapter 7.5.2
are to be observed.
In the case of prolonged storage conservation agents
on machined component surfaces and packing with a
desiccant may be necessary.
3.1 Return consignments
Pumps which have conveyed aggressive or
toxic media must be well flushed and
cleaned before being returned to the
manufacturer's works.
It is imperative to enclose a safety information sheet /
general safety certificate on the field of application
with the return consignment.
Pre-printed forms are enclosed with the installation
and operating manual.
Safety precautions and decontamination measures
are to be mentioned.
3.2 Disposal
Parts of the pump may be contaminated with medium
which is detrimental to health and the environment
and therefore cleaning is not sufficient.
Risk of personal injury and damage to the
environment due to the medium or oil!
♦Wear protective clothing when work is performed
on the pump.
♦Prior to the disposal of the pump:
▪Collect any medium, oil etc. which has
escaped and dispose of it in accordance with
the local regulations.
▪Neutralise any medium residues in the pump.
♦Separate pump materials (plastics, metals etc.)
and dispose of them in accordance with the local
regulations.

Series RMA-B close-coupled design Page 10
9450-055-en Revision 01
TM 9886 Edition 11/2018
4 Product description
The housing dimensions, nominal ratings and
technical requirements of the pump series RMA-B
correspond to ASME B73.1, ASME B73.3, ISO 15783,
ISO 5199. The technical requirements of the VDMA
24279 are satisfied.
The sectional drawing shows the design of the pump.
See Chapter 9.
All components which come into contact with the
medium are either plastic-lined or made of other
resistant materials, e.g. silicon carbide.
The housing 100 consists of a metallic shell with a
plastic lining.
The shaft spider 338 is pressed into the housing and
secured with the anti-torsion inserts 566/1.
The two bearing bushes 545 are pressed in from the
bearing pedestal side and secured with the anti-
torsion insert 566/2.
The distance ring 504 is inserted in-between.
The can 159is made of CFK (high-resistance, carbon
fibre composite material). It is protected against the
corrosive medium by a can insert 158 made of
resistant plastic.
The thrust ring 510/3 is pressed in and has a positive
connection with the shaft 222 to prevent it from
turning. The shaft 222 is mounted with a positive
connection in the can insert 158.
The impeller 230 and the inner magnet assembly 859
can be separated and can therefore be replaced
independently of each other. Both components have a
positive connection for power transmission.
The static tightness of the pump is guaranteed by
the screw fittings of the bracket 344 and housing
100. The bearing pedestal gasket 401and the lips of
the can unit are jammed between both components
with the required sealing force.
In NEMA motors, the torque is transmitted to the
drive rotor via the dowel pins engaging the motor
shaft groove.
For ISO motors, the torque is transmitted from the
motor shaft to the drive rotor via the key.
This is secured axially on the motor shaft with two
threaded pins 904/1.
In the event of a leak in the can unit, the closed
lantern construction offers additional time-limited
protection against the medium leaking into the
atmosphere.
The flushing flow is guided on the outside past the
impeller assembly into the can. The flushing flow
returns to the housing through flushing bores in the
impeller assembly and through the plain bearings.
Further design details are provided in the enclosed
drawing. Additional information are provided in the
brochure and the product manual.

Series RMA-B close-coupled design Page 11
9450-055-en Revision 01
TM 9886 Edition 11/2018
5 Installation
5.1 Safety regulations
Equipment which is operated in potentially
explosive areas must satisfy the explosion
protection regulations.
People with a pacemaker are at risk from the
strong magnetic field of the magnetic drive. It
may be life-threatening for them to stay at a distance
of less than 20” (500 mm) to the pump.
5.2 Installation of pump/unit
The structural work must be prepared in accordance
with the dimensions in the installation drawing.
Method of installation: on a grouted base plate and
firm foundation
♦Align base plate on the ground foundation.
♦Insert foundation bolts and grout base plate.
♦Do not tighten the foundation bolts uniformly and
firmly until the mortar has set.
Other possibilities of installing the pump are:
♦4-point installation
♦4-point installation with base plate.
As soon as additional installations are
mounted, the stability of the entire unit
installed without a foundation must be
checked.
5.3 Alignment of pump - motor
The following information is of a general
nature. If necessary, special notes of the
coupling and motor manufacturer are to be
observed.
♦Before starting alignment, undo the screw fitting of
the support bracket from the adapter and motor.
♦Align the unit with the housing so that there is no
tension and retighten the screws.
♦Use supports in the direct vicinity of the bolts
foundation/base plate.
5.4 Piping
Before the pump is installed, both, the suction and
supply lines as well as the discharge line are to be
cleaned.
Dirt or damage to the sealing surfaces is best avoided
if the flange covers remain on the flanges until just
before installation.
Use flange gaskets suitable for the medium.
The screw tightening torques in Chapter 1.1 are to be
observed for tightening the flange screws.
5.4.1 Nominal size
The operating design point of a centrifugal pump lies
at the intersection of the pump curve and the pipe
curve, see Fig. 2. The pump curve is provided by the
pump manufacturer. The pipe curve is determined
using diagrams or PC programs.
Fig. 2
Under no circumstances can the nominal size of the
piping be derived from the connected nominal size of
the pump.
The pipe nominal size can also be determined using
the flow rate as a rough guide.
v (ft/s) =
)(449
)(
2
ftAx
gpmQ
v (m/s) =
)(
)/(
2
3
mA
smQ
The velocity in the suction line should not exceed
6.56 ft/s (2 m/s) and 16.4 ft/s (5 m/s) in the discharge
line.
When determining the suction line nominal size, the
NPSH value (net positive suction head) must also be
observed. The NPSHR value required for the pump
is specified in the data sheet.
The NPSHR available in the plant
should be at least 1,64 ft (0,5 m)
higher than the NPSHR required for
the pump. Otherwise, this will lead to a drop in the
delivery head, cavitation or even failure of the pump.

Series RMA-B close-coupled design Page 12
9450-055-en Revision 01
TM 9886 Edition 11/2018
5.4.2 Nozzle loads
The pump can be subjected to nozzle loads in
accordance with ANSI/HI 9.6.2.
Changes in the length of the piping caused by
temperature are to be allowed for by appropriate
measures, e.g. the installation of expansion joints.
5.4.3 Suction line
The suction lines must always be laid on a rising
gradient towards the pump. Otherwise, gas bubbles
may form which considerably reduce the suction line
cross section. Eccentric transition elements must be
installed between different pipe diameters.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
Fig. 3
5.4.4 Supply lines
Supply lines should vent towards the reservoir and
are therefore to be laid with a constant downward
gradient towards the pump. Should the piping
internals upstream of the pump be horizontal, a low
point can, of course, be located upstream of these
internals. From here the pipe is then laid with an
upward gradient to the pump so that the gas bubbles
which form here can escape through the pump.
Valves which disrupt the course of flow should not be
installed directly upstream of the pump.
5.4.5 Discharge line
Do not arrange the shut-off valve directly above the
pump but initially provide a transition section.
The discharge nozzle velocity of the medium can – if
necessary – be reduced.
5.4.6 Venting and evacuating
Venting can take place into the discharge line or
upstream of the discharge valve.
A venting line can also be used as a bypass, drain or
flushing line.
The pump housing is fitted with a drain connection
as a standard feature. Optionally, the drain bore can
be drilled.
See Fig. 4.
Fig. 4
5.5 Pipe fittings
The following pipe fittings are available from Richter
on request:
♦Shut-off valves
♦Check valves
♦Sight glasses
♦Priming vessels
♦Strainers
♦Pressure gauges
Fig. 5

Series RMA-B close-coupled design Page 13
9450-055-en Revision 01
TM 9886 Edition 11/2018
5.6 Monitoring facilities
Appropriate monitoring facilities are to be
recommended, depending on the
requirements placed on operational safety
and availability of the unit.
Richter provides information on request and can
supply:
♦Flow meters
♦Filling level indicators
♦Motor load monitors
You can obtain the publications "Safe Operation of
Magnetic Drive Pumps" and "The Operation of
Centrifugal Pumps without NPSH Problems" on
request.
5.7 Drive
The power consumption of the pump at the operating
design point is specified in the data sheet and works
certificate. If the operating design point was not
known when the pump was dispatched, the power
consumption can be read off the appropriate
performance curves. The max. density, the max.
viscosity and a safety margin are to be allowed for.
Care must be taken when selecting the motor size to
ensure that the excess power is not too great, but
meet requirements acc. to ANSI/HI respec. ISO 5199.
During start-up the magnetic drive could otherwise
stop.
The magnetic drive rating at nominal speed is given in
the pump data sheet.
If the motor rating exceeds this magnetic drive rating
– at nominal speed -, it is necessary to check for any
stoppage of the magnetic drive.
This also applies if the required drive rating exceeds
80% of the magnetic drive rating – at nominal speed.
Consult Richter if necessary.
Different operating data can be achieved without
changing the pump through the use of different
speeds, e.g. by means of a frequency converter.
The pump with base plate and motor is illustrated in
the installation drawing.
If the maximum motor weight is above 130 kg (286
lbs), motors with support brackets (B35) have to be
used.
Observe the operating manual of the motor
manufacturer.
A motor with a valid ATEX certificate is to be
used if employed in zone 1 and 2.
5.8 Electric connection
The operator is obligated to connect the assembly in
accordance with existing regulations 8 (IEC, VDE,
etc.).
Allow only a trained electrician to perform
the electrical connection.
Compare the existing mains voltage with
the indications on the motor’s manufacturer’s
nameplate and choose a suitable circuit.
A motor protection device (motor-circuit switch) is
urgently recommended.
Danger of explosion if the electrical
installation is incorrect.
In areas at risk of explosion, IEC 60079-14
must also be observed for the electrical
installation.
If the pump is mounted on a base plate, ensuring
electrical conduction through the use of a chopper
disk or contact disk on the housing foot and support
bracket.
The assembly must be grounded in accordance with
currently effective regulations, for example, on the
base plate.

Series RMA-B close-coupled design Page 14
9450-055-en Revision 01
TM 9886 Edition 11/2018
6 Commissioning/Shutdown
6.1 Initial commissioning
Normally, the pumps have already been test-run with
water.
Unless special agreements have been reached, there
may still be some residual amounts of water in the
pump. This must be noted in view of a possible
reaction with the medium.
6.1.1 Filling the pump housing
♦Check to see whether the screws on the suction
flange, discharge flange, housing flange and drain
flange are tightened. When tightening the housing
screws, it must be ensured that the screw fitting
on the support bracket of the adapter and motor is
undone. Otherwise, the pump may be subjected to
tension.
For screw tightening torques see Chapter 1.1.
♦Open the suction line fully so that the medium can
flow into the pump.
♦Open the discharge valve so that the air in the
pump can escape.
♦If air cannot be vented into the discharge line, e.g.
a drop in pressure in this line is not permitted,
venting must be performed upstream of the
discharge valve.
♦Monitor the venting operation until no air but only
liquid emerges.
♦Turn the pump shaft at the coupling several times.
♦Monitor the venting operation again until no more
air emerges.
♦Close the discharge valve again until
only the minimum flow rate is obtained
after the motor has been started.
6.1.2 Start-up
♦Check to see whether the pump shaft can be
readily turned by hand.
♦Check the direction of rotation of the motor with
the coupling disengaged or with a rotary field
instrument.
♦As viewed from the motor, the direction of rotation
of the pump is clockwise. See also the direction
of rotation arrow of the pump.
The pump must not run dry during the check
of the direction of rotation.
♦Check alignment of the coupling.
♦Mount coupling guard.
The pump must be completely filled with
liquid.
The maximum admissible flow rate must not
be exceeded.
Otherwise the plain bearings can run dry in
both cases.
♦Switch the motor on.
♦Set the desired flow by opening the discharge
valve.
When the motor is running but the pump is not
conveying, this means that the magnetic drive has
stopped.
♦Switch motor off immediately in order to prevent
overheating of the magnet assemblies.
Then proceeded as follows:
♦Close discharge valve down to the position
"minimum flow rate"
♦Start motor again.
If the magnetic drive stops again, look for the cause.
6.2 Operating limits
The operating limits of the pump/unit in
terms of pressure, temperature, power and
speed are entered in the data sheet and it is
imperative to observe them!
6.2.1 Abrasive media
If liquids with abrasive constituents are
conveyed, increased wear at the pump is to
be expected. The inspection intervals should
be reduced compared with the usual times.
6.2.2 Min./max. flow rate
The operating range generally recommended lies at
0.3 Qopt to 1.1 Qopt. Consult the manufacturer for
operation outside this range and observe Chapter
2.6.2.

Series RMA-B close-coupled design Page 15
9450-055-en Revision 01
TM 9886 Edition 11/2018
6.3 Shutdown
♦Close discharge valve down to the position
"minimum flow rate"
♦Switch motor off.
♦Close discharge valve completely.
Only close the suction line if the pump is to be
evacuated or dismantled.
For all work on the machine, make sure that
the motor cannot be inadvertently switched
on.
If the pump is to be evacuated or flushed,
observe the local regulations.
If the pump has been operated with a
chargeable liquid, it must be filled with inert
gas (e.g. nitrogen) to prevent an explosive
atmosphere.
It is recommended to wait one hour before the pump
is dismantled from the plant to permit static peak
charges to be eliminated.
If the pump is returned to the manufacturer's, clean
the pump very thoroughly.
See also Chapter 3.1.
6.4 Restarting
When the pump is restarted, it must be ensured that
all the relative steps as described in Chapter 6.1 are
repeated, depending on the progress of the shutdown
operation.
6.5 Improper operations and their
consequences (examples)
Improper operation, even for brief periods,
may result in serious damage to the unit.
In connection with explosion protection,
potential sources of ignition (overheating, electrostatic
and induced charges, mechanical and electric sparks)
can result from these inadmissible modes of
operation; their occurrence can only be prevented by
adhering to the intended use.
Pump is started up without medium :
♦If no heat is dissipated, damage to the inner and
drive magnet assemblies may occur.
Pump is started up without medium :
♦The plain bearing in the pump may be destroyed.
♦Other pump components may be destroyed due
to overheating.
Suction line not opened or not opened fully :
♦Pump is cavitating – material damage to pump
and plain bearings
♦Pump does not attain the required delivery head
or flow rate.
♦Pump may be destroyed due to overheating.
Discharge valve opened too much :
♦Pump may be destroyed due to overheating.
Axial thrust too great.
Discharge valve closed too much :
♦Pump can cavitate. Particularly severe with an
empty discharge line.
♦Risk of pressure surge.
♦Possible damage to the plain bearings.
♦Magnetic drive may stop.
♦Motor may be overloaded.
Suction valve and discharge valve closed :
♦Destruction due to rapid overheating and sharp
rise in pressure.
Control of the pump with the suction valve :
♦Cavitation – the volume may only be regulated on
the discharge side. Cavitation – the volume may
only be regulated on the discharge side.
Overrun of the admissible gas content:
♦The flow may stop.
♦Switch pump and vent off for renewed
conveyance.
♦Make sure that the gas content is not exceeded,
as described in the intended use.

Series RMA-B close-coupled design Page 16
9450-055-en Revision 01
TM 9886 Edition 11/2018
7 Maintenance
7.1 Safety-relevant screw fittings
After initial loading by the operating pressure and
operating temperature the tightening torques of all
connection screws must be checked at the following
points:
♦housing flange
♦suction flange
♦discharge flange
♦draining flange
See also Chapter 6.1.1, para. 1.
Other inspections are to be performed regularly,
depending on the operating requirements.
7.2 Motor
Observe the operating manual of the motor
manufacturer.
A motor with a valid ATEX certificate is to be used if
employed in zone 1 and 2.
Observe the ATEX notes of the motor manufacturer.
7.3 Cleaning
Care must be taken when cleaning the pump to
ensure that it is not exposed to a strong water jet.
7.4 Stand-by pumps
If a pump is on stand-by, it is to be started up from
time to time. Regularly turn the shaft by hand in the
direction of rotation.
This operation is to be performed more often for
pumps which are exposed to very strong vibrations
from the plant.
When dismantling the pump from the plant, drain it,
thoroughly clean it, seal with flange covers and store
in accordance with the instructions.
7.5 Notes on dismantling
♦All repair and maintenance work is to be
performed by skilled staff using appropriate tools
and original spare parts.
♦Is the necessary documentation available?
♦Has the pump been shut down, drained and
flushed in accordance with the regulations?
See also Chapter 6.3.
♦If no new assembly is performed immediately after
dismantling, the plastic and ceramic components
in particular must be stored carefully.
♦Dismantling can be checked using the sectional
drawing in Chapter 9 and the components
available.
7.5.1 Protective clothing
Even if the pump has been properly
evacuated and flushed, residue of the
medium may still remain in the pump, e.g.
between sealing surfaces or in the bearing seats or
in the can.
Plastic components may absorb medium which
gradually emerges from the material after flushing.
Proper protective clothing is to be worn.
Protective clothing is also to be worn even if only the
adapter is to be removed. Medium may penetrated
the lantern chamber through the can.
7.5.2 Magnetic fields
Caution! Strong magnetic fields
Risk during dismantling and in the vicinity of
magnetic drives as single parts.
Remove loose parts and other magnetisable metals
from the work bench. They could otherwise be
attracted: Risk of accident!
Place any tools needed at a safe distance.
Keep electronic equipment and measuring
instruments at a distance. In cases of doubt consult
the equipment manufacturer.
Hold magnetic drives as single parts firmly or secure.
Otherwise they could be attracted, for example, by a
vice: Risk of accident!
People with an artificial pacemaker
Keep torso at a minimum distance of 20"(500 mm).
For safety's sake, a distance of 6" (150 mm) should
be observed for watches, electric data carriers, data
carriers with magnetic strips etc.
7.5.3 Changing the motor
If the motor has to be changed, the pressure-bearing
section of the pump can remain in the plant.
For procedure, see Chapter 7.6.2.

Series RMA-B close-coupled design Page 17
9450-055-en Revision 01
TM 9886 Edition 11/2018
7.6 Dismantling
There are two possibilities for dismantling:
1. Dismantling the complete pump from the plant.
2. Dismantling the complete slide-in unit as the pump
housing can remain in the plant connected to the
piping.
Dismantling of the complete pump is described here.
♦Undo the support bracket from the base plate.
The adapter and support bracket are one component
in bearing group 1. In bearing group 2 the support
bracket 183 is attached with 2 hex. screws 901/2 and
contact discs 557/2 to the adapter 346. With the motor
group TSC from size 280 upwards, the motor has the
support bracket and not the adapter.
If the housing 100 remains in the plant, leave the
housing gasket 401 in the centering to protect the
housing sealing surface.
7.6.1 Removing adapter
♦Undo screws 901/5 from the connection
bracket/adapter.
♦Remove adapter 346 from the centering of the
bracket 344. If necessary, use two levers.
♦To overcome the axial magnetic forces, pull the
adapter 346 upwards with a firm jerk.
CAUTION! When pulling out the
bearing pedestal, the axial magnetic
forces (up to max. 400 N without weight
force) decrease abruptly after being at
maximum. Risk of accident!
The operating torque of the magnetic coupling
installed is specified on the type plate.
7.6.2 Dismantling motor, adapter and drive
magnet assembly
♦Undo motor nuts and screws 901/7.
♦Remove the screwplug 903/4 from the adapter.
♦Undo both setscrews 904/1.
♦Pull adapter 346 forward.
♦Pull drive magnet assembly 858 off the motor
shaft.
♦If the drive magnet assembly is difficult to pull off,
use a release screw. See Fig. 6.
Arelease screw 5/8” – 11 UNC
Bmotor shaft
Fig. 6
♦Remove adapter 346.
7.6.3 Dismantling slide-in unit
♦Undo housing screws 901/3.
♦Screw 2 hex. screws 901/3 into the forcing thread
of the bracket 344.
♦Press the housing 100 with the aid of these hex.
screws out of the bracket 344.
♦Remove bracket 344 upwards.
♦Raise can 159 and can insert 158. As the shaft
222 is introduced tightly into the can insert 158,
this shaft is automatically removed together with
the thrust ring 510/3.
Make sure that no parts of the plain
bearing fall. Risk of breakage!.
♦Remove shaft 222 with thrust ring 510/3 from the
can. Place a suitable tool, e.g. scribing iron,
behind the thrust ring and pull it off applying
force at several positions.
♦Remove housing gasket 401.
♦Raise inner magnet assembly 859 vertically with
the impeller 230. The wear ring 502/1 is removed
from the housing 100 at the same time.
♦Remove thrust ring 510/2 using a screwdriver.
♦Press the bearing bushes 545 and distance ring
504/1 off the impeller from the suction side. Use a
suitable mandrel made of plastic.
Alternatively, the pull-off device can also be used.
See assembly aids in Chapter 10.2.
♦Remove anti-torsion insert 566/2.
♦The circlip 932/7 must be destroyed to separate
the impeller 230 and inner magnet assembly 859.
For this purpose, carefully cut the circlip open
with a cutting knife all around the notch.

Series RMA-B close-coupled design Page 18
9450-055-en Revision 01
TM 9886 Edition 11/2018
♦Press impeller 230 out of the seat of the inner
magnet assembly 859. For this purpose, clamp the
inner magnet assembly 859 in a vice, being careful
not to damage the surfaces, and press the impeller
230 out towards the suction side.
Alternatively, the dismantling device can also be
used. See assembly aids in Chapter 10.3.
♦Carefully remove the remaining parts of the circlip
932/7.
7.6.4 Dismantling housing/shaft spider
♦Pull shaft spider 338 out of the housing seat.
♦Remove the two anti-torsion inserts 566/1.
♦Remove shaft sleeve 523/1 from the shaft spider
338.
7.7 Notes on assembly
♦Use original spare parts. See also Chapter 2.4.
♦Do not use defective parts.
♦Has the pump been shut down, drained and
flushed in accordance with the regulations?
See also Chapter 6.3.
♦Apply Anti-Seize special assembly paste (e.g. from
Weicon) to the fitting surfaces (not any stainless
steel surfaces) and screw thread prior to
assembly.
♦Check whether all parts fit and only then
assemble.
♦Important dimensions (centerings, bearing fits or
bearing play) are to be checked prior to assembly;
perform a trial assembly if required.
♦We recommend that the housing gasket 401 and
the shaft sleeve 523/1 be replaced during every
new assembly.
♦When the drive magnet assembly is reassembled,
the two setscrew 904/1 must be replaced by new
ones.
Observe tightening torques, see chapter 7.8.3
♦Always replace the circlip 932/7.
♦Remove metallic particles adhering to magnetic
components such as the inner magnet assembly
859 and the drive magnet assembly 858 prior to
assembly.
For this purpose simple plasticene can be used..
♦A complete assembly process is described in the
following.
Sub-sections can be deduced from this.
See also Chapter 7.5.
♦The following assembly dimensions must be
observed:
Dimension F
[inch] [mm]
Group 1
3.93 100
Group 2
4.33 110
Groups see Chapter 1.
Dimension F
End face of drive magnet assembly to contact
surface of adapter.
For safe assembly, it is advisable to check the
dimension F and the radial runout tolerance of
0.4 mm (0.016 inch) using a dial gauge.
Fig. 7
4

Series RMA-B close-coupled design Page 19
9450-055-en Revision 01
TM 9886 Edition 11/2018
7.7.1 Table for target dimension Z
The plain bearings require a minimum axial play for perfect functioning. This axial play "Z" must be checked using
the drawing Fig. 8after completion of assembly.
Size Dimension Z
inch (mm)
1,5"x1"x6"
…0,02 - 0,06
(0,5 - 1,5)
3"x1,5"x6"
3"x2"x6"
1,5"x1"x8"
3"x1,5"x8"
3"x2"x8"
4"x3"x8"
3"x2"x10"
4"x3"x10"H
6"x4"x10"
Z : required axial play of the plain bearings.
Fig. 8

Series RMA-B close-coupled design Page 20
9450-055-en Revision 01
TM 9886 Edition 11/2018
7.8 Assembly
A complete assembly process is described in the
following.
Sub-sections can be deduced from this.
7.8.1 Assembly of housing / shaft spider
♦Push or press the shaft spider 338 into the housing
100 together with the two anti-torsion inserts
566/1.
Use a suitable plastic tube for pressing.
The pressing force must only be
applied over the sliding surface of the
shaft spider.
(risk of the silicon carbide breaking)
♦Insert shaft sleeve 523/1 into the shaft spider 338.
7.8.2 Assembly of slide-in unit
♦Press the inner magnet assembly 859 onto the
impeller 230. Pay attention to the correct alignment
of the driver cams.
♦Press the circlip 932/7 into the appropriate groove
on the impeller 230 with a suitable plastic tube.
Make sure that the click connection of the circlip
932/7 audibly engages to perform its function.
♦Press the bearing bush 545/1 into the impeller 230
together with the anti-torsion insert 566/2.
Make sure that the anti-torsion insert 566/2 is
approx. 2 mm shorter than the plain bearing.
♦Insert the distance ring 504 and then the bearing
bush 545/2.
♦Carefully press the thrust ring 510/2 into the
impeller 230 right to the stop. Pay attention to the
correct position of the anti-torsion insert grooves in
relation to the carrier webs in the impeller 230.
♦Check whether the thrust ring protrudes about 2
mm out of the impeller. See Fig. 8.
Fig. 9
♦Assemble can 159 and can insert 158. To
simplify assembly, the can insert 159 can be
cooled if necessary.
♦Introduce thrust ring 510/3 into the can insert
158. Make sure that the flushing grooves are
facing outwards.
♦Press shaft 222 into the can insert 158.
CAUTION: Align the shaft with the flat
pivot point in the thrust ring (risk of
the silicon carbide breaking)
Fig. 10
7.8.3 Assembly of drive unit
♦Affix adapter 346 to the motor flange with hex.
screws 901/7.
♦Check fit of the drive magnet assembly 858.
♦Screw both setscrews 904/1 into the drive
magnet assembly slightly.
♦Push the drive magnet assembly 858 completely
onto the motor shaft, using the anti-seize special
paste (for example, Weicon).
Caution: Use new setscrews.
♦Before assembly, apply a drop of LOCTITE Type
242 (blue) to the 904/1 setscrews.
♦Tighten both setscrews 904/1 with the indicated
torque through the hole in the adapter.
Tightening torque group 1 = 70 in-lbs (8 Nm)
Tightening torque group 2 = 90 in-lbs (10 Nm)