Wilo Scot Pump MVI 5 User manual

MVI_IOM_020122
MVI
Vertical, Multistage, Centrifugal Pump
Installation and Operating Instructions
A WILO BRAND

Fig. 1a - Model numbering information format
MVI – 750 – 4 /2 – 100HP – 405TSC – 304 – E – 230/460
Vertical, high-pressure, multistage centrifugal pump, in-line design
Pump gallons per minute ≤ BEP
Number of Pump stages at full diameter
Number of Pump stages at reduced diameter
Pump Horsepower
NEMA motor frame
Pump construction designation
EPDM elastomers (FKM also available upon request)
Motor Voltage
Fig. 1b - Model nameplate information
2

Fig. 2 - Proper Mounting
Fig. 3 - Proper Lifting
Lift pump assembly and pump and
motor assembly with lifting straps that
pass through the motor stool.
Ensure that the load is not applied
to the pump shaft.
Special "L" bracket needed to mount horizontally in-
line with the motor feet.
3

Fig. 4 - Allowable liquids to be pumped
Pumped fluid "Fluid Concentration,
temperature"
MVI 304 Stainless Steel MVI 316 Stainless Steel
EPDM Viton EPDM Viton
Acetic acid anhydride 77°F
Alkaline cleaner
Aluminium sulphate 10%,77°F
Ammonia water (A.
hydroxide)
20%,104°F
Ammonia hydrogen
carbonate
10%,104°F
Benzoic acid 10%,194°F
Boric acid Unsaturated solution,
140°F
Butanol 140°F
Calcium acetate 30%,122°F
Calcium hydroxide Saturated solution,
122°F
Chromic acid 1%,68°F
Condensate 194°F
Copper sulphate Unsaturated solution,
140°F
Deionic (fully
desalinated water)
122°F
Ethanol 100%,68°F
Ethylene glycol/
Diethylene glycol
40%, 158°F
Fixer 77°F
Formic acid 5%,68°F
Fruit juice 122°F
Glycerine 50%,122°F
Heating oil (Light)
Hydraulic oil 100%, 212°F
lsopropanol
Lactic acid 10%,68°F
Linoleic acid 100%,68°F
Linseed oil 140°F
Liqueur 140°F
Maize oil 176°F
Maleic acid 50%,122°F
Methanol 100%,68°F
Motor oil 100%,176°F
Oil-water-mixture 212°F
4

Fig. 4 - Continued
Pumped fluid "Fluid Concentration,
temperature"
MVI 304 Stainless Steel MVI 316 Stainless Steel
EPDM Viton EPDM Viton
Oxalic acid 1%,68°F
Peanut oil 100%,176°F
Phosphoric acid 20%,68°F
Polyglycols 194°F
Polyethylene glycols 40%, 158°F
Potassium carbonate 10%,140°F
Potassium hydrogen
carbonate
10%,140°F
Potassium
permanganate
5%,68°F
Potassium sulphate Unsaturated solution,
176°F
Rapeseed oil 100%,176°F
Silicone oil 100%
Sodium carbonate 10%,140°F
Sodium hydroxide 25%,122°F
Sodium nitrate Unsaturated solution,
176°F
Sodium phosphate 5%, 212°F
Sodium sulphate 10%,140°F
Sulphuric acid 5%,77°F
Water
Swimming pool water 95°F
Deionic 122°F
Distilled water 122°F
Decarbonated water
Soft water
Heating water
Boiler water
Pure water
Rinsing water
5

Fig 5 - Maximum Operating Pressure and Inlet Pressure
Stages Maximum Operating Pressure Stages Maximum Inlet Pressure
MVI 5
2-27 363 psi 2-25 145 psi
27 217 psi
MVI 15
2-25 363 psi 2-17 145 psi
19-25 217 psi
MVI 20
2-24 363 psi 2-9 145 psi
10-24 217 psi
MVI 50
1-10 232 psi 1-5 116 psi
12-17 363 psi 6-17 145 psi
MVI 75
1-8 232 psi 1-2 116 psi
9-12 363 psi 3-12 145 psi
MVI 100
1 - 7 232 psi 1 116 psi
8 - 10 363 psi 2 - 10 145 psi
MVI 160
1/1 -5 232 psi 1/1-2 58 psi
6/2-11/2 435 psi 3/2-6 145 psi
7/2 - 11/2 217 psi
MVI 225
1/1 - 4/2 232 psi 1/1 - 1 58 psi
4/1 - 8/1 435 psi 2/2-3 145 psi
4/2 - 8/1 217 psi
MVI 320
1/1-3 232 psi 1/1 58 psi
4/2 - 5/2 435 psi 1-2/1 145 psi
2-5/2 217 psi
MVI 450
1/1-3 232 psi 1/1 - 1 145 psi
4/2 - 4/1 435 psi 2/2 - 4/1 217 psi
MVI 600
1/1 - 5/2 435 psi 1/1 - 1 145 psi
2/2 - 3 217 psi
4/2 - 5/2 290 psi
MVI 750
1/1 - 4/1 435 psi 1/1 145 psi
1/2 217 psi
3/2 - 4/1 290 psi
6

Fig. 6a - MVI - 5, 15, 20, 50, 75, 100 Section View
Fig. 6b - MVI - 160, 225, 320, 450 Section View
MVI - 160, 225, 320, 450
MVI - 5, 15, 20, 50, 75, 100
7

MVI - 6 00, 750
Fig. 6c - MVI - 600, 750 Section View
Fig. 7a - Proper Installation Clearances
10
8

Fig. 7b - MVI - 5, 15, 20 Flange/Footprint
Fig. 7c - MVI - 50, 75, 100 Flange/Footprint
75
2.95
210
8.27
34
1.34
0.75 x 1.0625
[x4]
.55
[x4]
5.51
4.13
3.35
3.50
1 1/4" - 300# ANSI
SUCTION &
DISCHARGE
100
3.94
180
7.09
4 x
14
.55
210
8.27
Fig. 7d - MVI - 160 Flange(s)/Footprint
90
3.54
249
9.80
26
1.02
0.75 x 0.875
[x4]
6.50
5.00
4.76
2" - 300# ANSI
SUCTION &
DISCHARGE
130
5.12
215
8.46
248.61
9.79
4 x
14
.55
299
11.77
30
1.18
105
4.13
0.75
[x4]
7.00
5.50 5.88
MVI 160-1/1 - 160-5
2.5" - 150# ANSI
SUCTION &
DISCHARGE
7.50
0.875
[x8]
MVI 160-6/2 - 160-11/2
2.5" - 300# ANSI
SUCTION &
DISCHARGE
170
6.69
240
9.45
[14]
0.55
[x4]
299
11.77
9

Fig. 7e - MVI - 225 Flange(s)/Footprint
Fig. 7f - MVI - 320, 450 Flange(s)/Footprint
330
12.99
45
1.77
140
5.51
0.75
[x4]
7.50 6.00
6.63
8.25
0.875
[x8]
190
7.48
265
10.43
[14]
0.55
[x4]
330
12.99
MVI 225-1/1 - 225-4/2
3" - 150# ANSI
SUCTION &
DISCHARGE
MVI 225-4/1 - 225-8/1
3" - 300# ANSI
SUCTION &
DISCHARGE
330
12.99
45
1.77
140
5.51
9.00
.75
[x8]
7.50
7.87
.88
[x8]
10.00
190
7.48
265
10.43
[14]
.55
[x4]
330
12.99
MVI 320-1/1 - 320-3
MVI 450-1/1 - 450-3
4" - 150# ANSI
SUCTION &
DISCHARGE
MVI 320-4/2 - 320-5/2
MVI 450-4/2 - 450-4/1
4" - 300# ANSI
SUCTION &
DISCHARGE
Fig. 7g - MVI - 600, 750 Flange(s)/Footprint
471.5
18.56
181
7.13
43
1.69
88
3.46
0.875
[x8]
10.83
8.50
0.875
[x8]
10.83
9.25
274.64
10.81
381
15.00
471.50
18.56
17.5
.69
[x4]
MVI 600-1/1 - 600-4/2
MVI 750-1/1 - 750-3
5" - 150# ANSI
SUCTION &
DISCHARGE
MVI 600-4/1 - 600-5/2
MVI 750-4/2 - 750-4/1
5" - 300# ANSI
SUCTION &
DISCHARGE
10

Fig. 7h - Storage tank or water main installation
1
8
5
66
9
43
2
8
3.) vent plug
4.) priming plug
water
main
feed
Fig. 7i - Suction lift installation
10
7
2
4
9
5
1
66
3
3.) vent plug
4.) priming plug
11

Figure 7j - Proper pump mounting
5
1
2
3 3
4
2
1
6
7
Fig. 7k - Proper piping
12

Fig. 8a - Minimum Flow
13
COUPLING BOLTS
PUMP MOTOR FRAME BOLT in-lb N-m
MVI 5,15,20
56C M6 115 13
182TC M8 274 31
213TC M10 549 62
MVI 50,75,100
56C M6 115 13
182TC M8 274 31
213TC M10 549 62
254TC M10 549 62
MVI 160,225,320,450,600,750
182TC M10 549 62
213TC M10 549 62
254TC M10 549 62
284/6TSC M10 549 62
324/6TSC M10 549 62
364/5TSC M16 885 100
405TSC M16 885 100
STAYBOLTS
PUMP BOLT in-lb N-m
MVI 5, 15, 20 M12 310 35
MVI 50, 75, 100, 160, 225, 320,450 M16 708 80
MVI 600, 750 M16 1062 120
AIR VENT/DRAIN PLUG
in-lb N-m
310 35
IMPELLER NUT/LOCK NUT
PUMP in-lb N-m
MVI 5, 15, 20 159 18
MVI 50, 75, 100 195 22
MVI 160,225,320,450 885 100
MVI 600, 750 1593 180
STRAP BOLT
PUMP BOLT in-lb N-m
MVI 50,75,100,160, 225, 320,450 M8 133 15
SHAFT END NUT
PUMP BOLT in-lb N-m
MVI 600, 750 M14 398 45
SHAFT END BOLT
PUMP BOLT in-lb N-m
MVI 160,225,320,450 M8 274 31
MOTOR BRACKET & PUMP HEAD BOLT
PUMP BOLT in-lb N-m
MVI 160,225,320,450 M10 549 62
MOTOR BRACKET BOLT
BOLT in-lb N-m
M6 89 10
M8 106 12
M12 354 40
M16 708 80
Fig. 8a - Minimum Flow
0
5
10
15
20
25
30
180 190 200 210 220 230 240 250
Qmin (%)
t (°F)
Minimum Flow
Tightening Torque Specications

14
1. General
1.1 About this document
These installation and operating instructions are
an integral part of the product. They must be kept
readily available at the place where the product is
installed. Strict adherence to these instructions
is a precondition for the proper use and correct
operation of the product.
These installation and operating instructions
correspond to the relevant version of the product
and the underlying safety standards valid at
the time of going to print. SPECIAL NOTE: ALL
REFERENCES TO FIGURES WILL BE ON PAGES
2-13.
1.2 Modeling information
Please refer to Fig. 1a (page 2) - Model numbering
information format, for the reference concerning
the model description.
1.3 Model nameplate information
Every MVI pump shall be shipped with a specic
nameplate for the model ordered that includes all
the information of the pump. Please refer to Fig.
1b (page 2) -Model nameplate information .
2. Safety
These instructions contain important information
which must be followed when installing and
operating the pump. It is therefore imperative that
they be read by both the installer and the operator
before the pump is installed or operated.
Both the general safety instructions in this
section and the more specic safety points in the
following sections should be observed.
2.1 Instruction symbols used in this operating
manual
Symbols
General danger symbol
Hazards from electrical causes
NOTE: ...
Signals words:
DANGER! Imminently hazardous situation.
Will result in death or serious injury if not
avoided.
WARNING! Risk of serious injury. ‘Warning’
implies that failure to comply with the safety
instructions can potentially result in severe
personal injury.
CAUTION! Risk of damage to the pump if
improperly installed.
NOTE: Useful information on the handling of the
product. It alerts the user to possible problems.
2.2 Personnel qualication
The personnel installing the pump must have the
appropriate qualication for this work.
2.3 Possible risks incurred by failure to comply with
the safety instructions
Failure to comply with the safety instructions
could result in personal injury or damage to the
pump or installation. Failure to comply with the
safety instructions could also invalidate any claim
for damages.
In particular, failure to comply with these safety
instructions could give rise, for example, to the
following risks:
• Failure of important pump or installation
functions,
• Failure of specied maintenance and repair
methods,
• Personal injury due to electrical, mechanical and
environmental causes,
• Damage to property.
2.4 Safety precautions for the operator
The relevant accident precaution regulations must
be observed. Dangers caused by electrical energy
must be excluded. Local or general regulations
[e.g. NEC,NEMA, etc.] and directives from local
codes.
2.5 Safety precautions for inspection and
installation
The operator must ensure that all inspection and
installation work is carried out by authorized and
qualied specialists who have carefully studied
these instructions.
Work on the pump/unit must be carried out only
with the pump disconnected (locked out) from
the electrical supply and at complete standstill.
For proper mounting options concering the pump
installation please refer to Figure 2 (page 3)
Proper Mounting.
2.6 Unauthorized alterations and manufacture of
spare parts
Alterations to the pump or installation may only
be made in agreement with the manufacturer.
The use of original spare parts and accessories
authorized by the manufacturer will ensure safety.
The use of any other parts may invalidate claims
revoking the liability of the manufacturer.
2.7 Improper use
The proper operation of the pump or installation
can only be guaranteed if it is used in accordance
with the operating instructions. All values must
neither exceed, nor fall below, the limit values
given in the catalogue or data sheet.
3. Transport and interim storage
When receiving the material, check that there has
been no damage during the transport. If shipping
damage has occurred, take all necessary steps
Scot Pump 02/2022

15
with the carrier within the allowed time. Prior
to installation of the pump, please check that all
bolts are tightened that may have loosened during
the transportation process (particularly between
motor and motor bracket). Please handle the pump
carefully so as not to damage the unit. Refer to
Fig. 3 (page 3) - Proper Lifting for proper lifting
procedures and guidelines.
CAUTION! Outside inuences may cause damages !
If the delivered material is to be installed later on,
store it in a dry place and protect it from impacts.
4. Application
4.1 Allowable pump liquids
This pump’s basic function is to pump hot or cold
water, water with glycol or other low viscosity
uids that contain no mineral oil, solid or abrasive
substances or materials having long bres. The
manufacturer’s approval is required for use to
pump corrosive chemicals. Please refer to Fig. 4
(pages 4-5) -Allowable liquids to be pumped.
DANGER! Risk of explosion!
Do not use this pump to handle ammable or
explosive liquids.
4.2 Application areas:
Water Supply and Pressure Boosting:
• Pressure boosting in buildings, hotels,
residential complexes
• Pressure booster stations supply of water
networks
• Pressure boosting for industrial water supply
Irrigation and Agriculture:
• Greenhouse
• Sprinkler irrigation
• Field irrigation (ooding)
Light Industry:
• Washing and cleaning systems
• Car washing facilities
• Fire ghting systems
• Process water systems
• Machine tools (cooling lubricants)
Water Treatment:
• Water softeners and de-mineralization
• Reverse Osmosis systems
• Filtration
• Ultra-ltration systems
• Distillation systems
Heating, Ventilation and Air-Conditioning:
• Boilers
• Induction heating
• Heat exchangers
• Refrigerators
• Cooling towers and systems
• Temperature control systems
5. Technical data
5.1 Technical data
- Maximum operating pressure please Refer to Fig. 5
(page 6) - Maximum Operating Pressure and Inlet
Pressure
• Maximum suction pressure: 145 PSI (10 BAR)
- Temperature range
• Fluid temperature: 5 to 248°F (120°C)
• Ambient temperature: 32 to 104°F (40°C)
WARNING
If ambient temperatures are above 104°F, or if the pump is
located at elevations more than 3,281 feet (1,000 meters)
above sea level, the motor’s output must be decreased to
compensate for less effective cooling, and may have to be
replaced with a stronger motor.
5.2 Scope of Supply
• Multistage pump.
• Installation and operating instructions.
5.3 Accessories
Original accessories are available for the MVI range.
The accessories must be ordered separately.
6. Description and function
6.1 Product description
Fig. 6a (page 7) - MVI - 5, 15, 20, 50, 75, 100
Section View
12 – chamber
18 – impeller
24 – neck ring
36 – pedestal
37 – shaft
44 – coupling
48 – outer sleeve
56 – cover, seal chamber
57 – mechanical seal
59 – pump volute
62 – baseplate
82 – O-ring
Fig. 6b (page 7) - MVI - 160, 225, 320, 450 Section
View
12 – chamber
14 – bearing ring
18 – impeller
24 – neck ring
36 – cover, seal chamber
37 – shaft
42 – bottom bearing ring
48 – outer sleeve
53 – pedestal
57 – mechanical seal
59 – pump volute
62 – baseplate
82 – O-ring
Fig. 6c (page 8) - MVI - 600, 750 Section View
12 – chamber
17 – bearing ring
Installation and operating instructions - MVI 5, 15, 20, 50, 75, 100, 160, 225, 320, 450, 600, 750

16
18 – impeller
24 – neck ring
36 – cover, seal chamber
37 – shaft
42 – bottom bearing ring
48 – outer sleeve
53 – pedestal
57 – mechanical seal
59 – pump volute
62 – baseplate
62A – baseplate
82 – O-ring
6.2 Design of product
• MVI pumps are vertical, high pressure, non-self
priming pumps with inline connection based on
multistage design.
• MVI pumps combine use of both high efciency
hydraulics and motors.
• All metallic parts in contact with water are made
of stainless steel.
7. Installation and electrical connection
Installation and electrical work in compliance
with any local codes and by qualied personnel
only.
WARNING! Bodily injury!
Existing regulations for the prevention of
accidents must be observed.
WARNING! Electrical shock hazard!
Dangers caused by electrical energy must be
excluded.
7.1 Commissioning
Unpack the pump and dispose of the packaging
in an environmentally responsible manner.
7.2 Installation
The pump must be installed in a dry, well
ventilated and frost-free place. Always refer
to the local or national regulations and codes
relating to the selection of the installation site,
the water and power connections, etc.
CAUTION! Possible damage of the pump!
• It is recommended that any welding and
soldering work be done before installing the
pump.
• Thoroughly ush the system before installing
the pump.
WARNING! Risk of injury due to hot surfaces!
The pump must be positioned so that someone
cannot come into contact with the hot pump
surfaces while in operation.
- Install the pump on a at concrete block using
appropriate accessories. If possible, use an
insulating material under the concrete block to
avoid any noise and vibration transmission into
the installation.
WARNING! Risk of fall!
The pump must be correctly screwed to the
ground.
- Place the pump where it will be easy to reach, to
facilitate inspection, replacement and removal
work. The pump must always be installed
perfectly upright on a sufciently heavy concrete
base. Refer to Fig.7a-page 8-Proper Installation
Clearances.
CAUTION! Risk of parts inside the pump!
Take care to remove port covers of the pump
housing before installation.
NOTE: Pumps may be pressure tested before
shipment. Some water may remain in the pump. It
is recommended, for hygienic purposes, rinse the
pump before any use with potable water supply.
- The installation and connection dimensions
(connection anges and pump footprint) are
given in Fig. 7b through Fig. 7g (page 9 - 10) -
Flanges/Footprint.
- Lift the pump carefully so as not to damage the
unit. Please refer to Fig. 3-page 3-Proper Lifting
for procedures and guidelines.
WARNING! Tipping Hazard!
Vertical multistage pumps may have a high center
of gravity. Make sure to secure the pump rmly to
avoid risks.
WARNING! Risk of Damage!
Do not use the motor lifting lugs when lifting the
entire pump: these are only designed to lift the motor
alone. Refer to Fig. 3-page 3-Proper Lifting.
For elevated storage tank and water main
applications please refer to Figure 7h-page 11-
Storage tank or water main installation
For well or underground storage tank applications
please refer to Fig. 7i-page 11-Suction lift
installation.
-Use a foot valve (component 10 in Fig. 7i -page
11-Suction lift installation)in case of negative
suction head.
7.3 Pipe connection
- Connect the pump to the system piping. For
anges refer to Fig. 7b through Fig. 7g (pages
8 - 10).
NOTE: Using elbows in any installation will
increase the ow resistance. Wide bends will
result in a lower ow resistance.
7.4 Anchoring
- The pump must be secured to a solid foundation
by bolts through the holes in the base plate.
Refer to the mounting footprint drawings in Fig.
7b through Fig. 7g (pages 8-10).
- The direction of uid ow is indicated on the
pump.
- Pump must be installed in such a way that it is
not stressed by the pipework. Use pipe supports
Scot Pump 02/2022

17
if necessary (component 1 in Fig. 7j - page 12
- Proper pump mounting for pipe support) to
avoid stresses on connections.
- It is advisable that isolation valves (component
2 in Figure 7j - page 12 -Proper pump
mounting) are installed on the suction and
discharge side of the pump.
- Use of expansion joints mitigates noise and
vibration (component 3 in Fig. 7j-page
12-Proper pump mounting). If the pump needs
to be operated with an on-off valve closed,
install a bypass line to avoid damaging the
pump. Do not place elbows next to the pump
intake and discharge. Refer to Fig. 7k-page
12-Proper piping. Consult Hydraulic Institute
9.6.6 for best practice.
- The nominal cross-section of the suction pipe
should be at least as large as that of the pump
connection.
- A check valve (component 4 in Fig. 7j -page
12-Proper pump mounting)should be placed
on the discharge pipe in order to protect the
pump against hammer shock.
- For direct connection to a water main, a
strainer (component 8 in Fig. 7h -page
11-Storage tank or water main installation) is
recommended.
- For indirect connection via a tank, the suction
pipe must have a strainer (component 8 in
Fig. 7h-page 11-Storage tank or water main
installation) to keep any impurities out of the
pump.
7.5 Motor connection for bare-shaft pump
(without motor)
- Remove coupling guards.
- Install the motor on the pump by using screws
or bolts, nuts and handling devices provided
with the pump: check motor power and
dimension in Scot catalogue.
NOTE: Depending on uid characteristics,
motor power could be modied. Contact Scot
Customer Service if needed.
- Close the coupling guards using all screws
provided with the pump. Allow for sufcient
space above the motor to facilitate proper
motor cooling. Refer to Fig. 7a-page 8 - Proper
Installation Clearances.
7.6 Electrical connections
DANGER! Danger of death!
National Electrical Codes (NEC), local codes and
regulations must be followed.
WARNING! Electrical shock hazard!
All electrical work must be conducted by a
qualied electrician! Make sure that the supply
voltages and frequencies, and phase are suitable
for the motor used.
• All electrical connections must be locked out
before performing any electrical task. Assure that
the control panel (component 5 in Fig. 7j-page
12-Proper pump mounting) conforms to local
standards and regulations.
• For safe installation and operation, the motor
must be properly grounded.
NOTE: Integral solid state short circuit protection
does not provide branch circuit protection. Branch
circuit protection must be provided in accordance
with the Manufacturer Instructions, National
Electrical Code and any additional local codes.
• The electric characteristics (frequency, voltage,
nominal current) of the motor-converter are
mentioned on the pump identication sticker.
Check that the motor complies with the mains
supply used.
• Install correct electrical overloads and breakers to
protect the installation mains voltage.
NOTE: Install a circuit-breaker for user
protection, it must have a delay effect. Adjust it
according to the current mentioned on the motor
nameplate.
• Use power cables conforming to NEMA and NEC
standards.
Connection terminal allocation
• Loosen the screws and remove the converter
cover.
• Refer to wiring diagram inside the motor junction
box.
8. Start up
8.1 System lling - Venting
CAUTION! Possible damage of the pump!
Never operate the pump dry. The system must be
lled before starting the pump.
8.1.1 Venting – (Fig. 7h-page 11-Storage tank or
water main installation)
- Close the two isolation valves (components 5
and 9 in Fig. 7h-page 11-Storage tank or water
main installation).
- Unscrew the air bleed screw in the vent plug (com-
ponent 3 in Fig. 7h-page 11-Storage tank or
water main installation).
- Slowly open the isolation valve on the suction side
(component 5 in Fig. 7h-page 11-Storage tank
or water main installation).
- Retighten the air-bleed screw when air escapes
at the air bleed screw and the pumped liquid
ows.
WARNING!
When the pumped liquid is hot and the pressure
high, the stream escaping at the air bleed screw
may cause burns or other injuries.
- Open the isolation valve on the suction side
completely.
- Start the pump and check if the direction of
rotation matches the one printed on pump
volute.
Installation and operating instructions - MVI 5, 15, 20, 50, 75, 100, 160, 225, 320, 450, 600, 750

18
CAUTION! Possible damage of the pump!
Incorrect rotation will cause poor pump
performance and cause possible pump damage.
8.1.2 Air evacuation process – Pump in suction lift
- Close the isolation valve on the discharge side
(component 9 in Fig. 7i-page 11-Suction lift
installation).
- Open the isolation valve on the suction
side(component 5 in Fig. 7i-page 11-Suction lift
installation).
- Remove the priming plug (component 4 in Fig.
7i -page 11-Suction lift installation).
- Fill the pump and the suction pipe with water.
- Make sure that there is no air in the pump
and in the suction pipe: rell until the complete
removal of air is achieved.
- Close the lling plug (component 4 in Fig. 7i
-page 11-Suction lift installation)
- Start the pump and check if the direction of
rotation is correct.
- Immediately open the isolation valve
(component 9 in Fig. 7i-page 11-Suction lift
installation)on the discharge side a little, to
assure the proper prime. Once assured, open the
valve entirely.
CAUTION! Possible damage of the pump!
Incorrect rotation will cause poor pump
performance and cause possible pump damage.
WARNING! Risk of burning!
When the pumped liquid is hot and the pressure
high, the stream escaping at the air bleed screw
may cause burns or other injuries.
8.2 Starting up
CAUTION! Possible damage of the pump!
The pump must not operate at zero ow (closed
discharge valve).
To prevent overheating of the internal pump
components, the pump should not be used at
ows below the minimum ow rate.
The curve in Fig. 8a-page 13-Minimum Flow
shows the minimum ow rate as a percentage
of the nominal ow rate in relation to the liquid
temperature.
WARNING! Risk of injury!
When the pump runs, coupling guards must be in
place, tightened with all appropriate screws.
WARNING! Noise!
Noise emitted by pumps could be very high;
hearing protection must be used in case of
extended operation in close proximity to the
pump.
WARNING!
Installation must be designed in order that no one
is injured in case of uid leakage.
8.3 Minimum Inlet Pressure - NPSH
To avoid cavitation, make sure that there is a
minimum pressure on the suction side of the
pump.Refer to the pump’s NPSHR curve.
WARNING! Risk of scalding!
Pressurized water can easily turn into steam
when venting, creating a condition where
scalding may occur.
9. Maintenance
All servicing should be performed by an
authorized service representative!
WARNING! Electrical shock hazard!
Dangers caused by electrical energy must be
excluded.
All electrical work must be performed after the
electrical supply has been locked out and secured
against unauthorized switching.
WARNING! Risk of scalding!
At high water temperatures and system pressure
close isolating valves before and after the pump.
First, allow pump to cool down.
General Notes:
- The pump does not have a recommended
maintenance schedule.
- The seals are wear parts easily replaced by
cartridge seal kits.
- Always keep the pump perfectly clean.
- Repairs to the electric motors are to be handled
only by Authorized agents.
- If you order a complete pump with motor,
please refer to the motor manual for additional
information.
9.1 Service of Mechanical Seal Instructions
Step 1: Remove the screws holding the
coupling guards and remove the guards.
Step 2: Unscrew the allen screws out of the
couplings and remove the coupling halves.
Step 3: Unscrew the four screws holding the
seal carrier and remove the carrier.
Step 4: Losen the allen screws holding the seal
about one-half turn. Do not remove the screws.
Step 5: Lift the seal straight up and off the
pump shaft. The cartridge seal will come off as
an assembly.
Step 6: Service or replace mechanical seal.
Step 7: Lubricate the shaft seals and O-rings.
Install the seal on the pump shaft making sure
that it seats on the pump head.
Step 8: Slide the seal carrier down the shaft
until it seats solidly on the shaft seal ange.
Grease the threads on the socket head bolts
and cross tighten them to 46 ft-lbs. torque.
Scot Pump 02/2022

19Installation and operating instructions -MVI 5, 15, 20, 50, 75, 100, 160, 225, 320, 450, 600, 750
Faults Possible causes Remedies
Pump does not run when the motor starter is
activated.
Supply failure or no power supply. Check connections or restart the power
supply.
Main contacts in motor starter are not
making contact or the motor coils are
defective.
Reconnect or replace contacts or
magnetic coil.
Pump or auxiliary circuit protection fuses
blown.
Replace fuses.
Pump or piping system may be
obstructed causing a jam.
Clear the obstruction and restart pump.
Motor may have failed. Replace the motor.
Motor protector or thermal relay has
tripped out.
Reset the motor or thermal protector.
Tripping of anti-dry running protection
(Provided by others).
Check the water level in the tank or the
water system pressure. If everything is in
order, check the protection device and its
connection cables.
Starter overload trips immediately when the power
is switched on.
Overload setting is too low. Set the motor starter correctly.
The cable connection is loose or faulty. Fasten or replace the cable connection.
Fuse is blown. Replace fuse and try starting again.
Pump is jammed by an obstruction. Check and clean obstruction from
system.
Contacts in overload are faulty. Replace motor starter contacts.
The motor winding is defective. Replace the motor.
Low voltage (Especially at peak time). Check the power supply.
The pump starts but, after a short time, the thermal
protector trips out or the fuses blow.
The voltage is not within the motor’s
operating limits.
Check the operating conditions of the
pump.
The control panel is situated in an
excessively heated area or is exposed to
direct sunlight.
Protect the control panel from heat
sources and from the
sun.
A phase in the power supply is missing. Check the power supply.
The pump starts up but, after a period of time, the
thermal protector trips.
Worn motor bearings causing motor to
overheat.
Replace motor bearings.
The pump’s delivery rate is higher
than the specied rate on the pump
nameplate.
Partially close the on-off valve located
discharge side until the delivery rate
returns to within the specied limits.
There are obstructions inside the pump
or pumping system.
Disassemble and clean the pump and
piping.
Less viscous liquids may cause the motor
to work too hard and overload the motor,
causing the motor to overheat.
Check the actual power requirements
based on the characteristics of the liquid
being pumped, and replace the
motor accordingly.
10. Faults, causes and remedies
WARNING! Electrical shock hazard!
Step 9: Cross tighten the allen screws holding the
seal to the shaft to six ft-lbs. torque.
Step 10: Lift the pump shaft and insert the shaft
spacer under the seal ange.
Step 11: Install the coupling with the bottom
portion sitting on the top of the shaft spacer.
Install allen screws and loosely tighten all four of
them.

20
11. Spare parts
Spare parts may be ordered via the local Scot
Pump distributor.
To avoid any questions or wrong orders, all data
of the name plate should be mentioned when
ordering, including date codes.
CAUTION! Danger of material damage!
Pump performance can only be guaranteed when
original spare parts are used.
• Only use original spare parts.
Scot Pump 02/2022
Faults Possible causes Remedies
Pump runs but no water delivered. Pump is not primed with liquid. Fill the pump with the liquid to be
pumped.
The pump, suction or discharge pipes
are blocked by solids in the liquid being
pumped.
Clean the pump, suction or discharge
pipe.
The foot or check valve is blocked or has
failed.
Replace the foot or check valve.
The suction pipe leaks. Repair or replace the suction pipe.
The air is in the suction pipe or pump. Remove trapped air from system.
Motor operating in wrong direction
(three-phase motor).
Change the direction of rotation of the
motor by reversing motor connections.
The frequency of pump start-up is too high. Leakage in the foot valve, check valve or
system.
Repair or replace the components.
Ruptured membrane or no air pre-charge
in surge tank.
See relevant instructions in surge tank’s
manual.
Vibration and noise Cavitation Reduce the required ow or improve
the operating conditions of the
pump (suction conditions, head, ow
resistance, liquid temperature, viscosity,
etc.).
Worn motor bearings. Replace the bearings or the motor.
Operation with frequency converter. Consult a qualied engineer from the
supplier of the frequency converter.
Check vibration and noise damping
devices
Replace vibration & noise dampers, if
worn.
12. Disposal
Information on the collection of used electrical
and electronic products.
Proper disposal and appropriate recycling of this
product prevents damage to the environment
and dangers to your personal health.
NOTICE: Disposal in domestic waste is forbidden!
To ensure proper handling, recycling and disposal
of the used products in question, please note the
following points:
• Only hand over these products at designated,
certied collecting points.
• Observe the locally applicable regulations!
Please consult your local municipality, the
nearest waste disposal site, or the dealer who
sold the product to you for information on proper
disposal.
Subject to technical alterations!